Answer:
All of them apply according to the exam your are on because they all need concentration to work up the certain chemical
Explanation
The physical properties of a solution are not affected by the concentration of the components.
Boiling points and freezing points of solutions change as the concentration of the solute changes.
Moles of solute = (Liters of solution) x (Molarity of solution)
(Initial Concentration)(Initial Volume) = (Final Concentration) (Final Volume)
Concentration affects if an acid is weak or strong.
Answer : All the given options are applicable for a solution’s concentration.
Explanation :
(1) The physical properties of a solution are not affected by the concentration of the components.
This statement is apply to a solution's concentration. Physical properties can be measured without changing the composition of substance. For example : The boiling point of 2 gram substance and 10 grams of substance will always remain same.
(2) Boiling points and freezing points of solutions change as the concentration of the solute changes.
This statement is apply to a solution's concentration. As we know that the boiling and freezing point of solution depends on the number of moles of solute or concentration of solute. So, as the concentration of solute changes the boiling and freezing point of solution.
(3) Moles of solute = (Liters of solution) x (Molarity of solution)
This statement is apply to a solution's concentration. As we know that the molarity is defined as the number of moles of solute present in one liter of volume of solution.
(4) (Initial Concentration)(Initial Volume) = (Final Concentration) (Final Volume)
This statement is apply to a solution's concentration as per dilution law.
(5) Concentration affects if an acid is weak or strong.
This statement is apply to a solution's concentration. As the concentration of an acid and base is the amount of moles of solute per unit volume. That means if a solution has higher molarity, then the concentration is also higher and vice-versa.
Hence, all the given options are applicable for a solution’s concentration.
Apply A hydrate contains 0.050 mol of H,O for every
0.00998 mol of ionic compound. Write a generalized
formula of the hydrate.
Answer:
General formula of the hydrate XY.5H₂O
Explanation:
The general formula of a hydrate is given by; XY.nH₂O
Where n is the number of water of crystallization;
n = Moles of H₂O/Moles of XY
= 0.050 Mol/0.00998 moL
= 5.01
≈ 5
Therefore, the generalized formula of the hydrate is XY.5H₂O
What is the value of n in CH3(CH2)nCH3 if the name of the hydrocarbon is heptane
Answer:
n = 5.
Explanation:
How many carbon atoms in total in this straight-chain hydrocarbon?
The prefix of the IUPAC name of a hydrocarbon (the part before -ane) shows the number of carbon atoms on the longest carbon chain.
[tex]\begin{array}{c|c}\text{Number of Carbon}\\ \text{atoms in backbone} & \text{Prefix}\\[-0.5em]\multicolumn{2}{c}{\rule{5cm}{0.5pt}}\\1& \text{meth-} \\ 2&\text{eth-} \\ 3&\text{prop-}\\4 & \text{but-}\\5 & \text{pent-} \\ 6 & \text{hex-} \\ 7 & \text{hept-} \\8 & \text{oct-}\\ \dots & \dots\end{array}[/tex].
Name of this hydrocarbon: heptane;Prefix: hept-;Number of carbon atoms in the longest chain: 7.Hence the structure:
[tex]\text{CH}_3\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_2\text{-CH}_3[/tex].
All the [tex]\text{-CH}_2\text{-}[/tex] in the formula might look redundant. "[tex]\text{CH}_2[/tex]" appears five times in a row and may be condensed into [tex](\text{CH}_2)_5[/tex]. Hence the condensed formula:
[tex]\text{CH}_3\text{-}{(\text{CH}_2)_{\bf5}\text{-CH}_3[/tex].
Therefore [tex]n = 5[/tex].
Answer:
n+5 so the correct answer is b) 5
Explanation:
just did review on edge
Calculate the molar mass of aluminum nitride
The formula of aluminum nitride is AlN
the molar mass of Al = 27 amu
the molar mass of N = 14
(1 x 27) + (1 x 14)
= 27 + 14
= 41 amu
Describe the difference between chemical and physical weathering
Difference Between Chemical and Physical Weathering.
Weathering processes crack, wear away, and weaken rocks.
While physical weathering breaks down a rock's physical structure, chemical weathering alters a rock's chemical composition.
Final answer:
Physical weathering is the process of breaking down rocks without changing their chemical composition, while chemical weathering involves chemical reactions that alter the composition of rocks. Physical weathering can occur through forces like freeze-thaw cycles, while chemical weathering can happen through processes like oxidation and hydration.
Explanation:
Physical weathering, also known as mechanical weathering, is the process of breaking down rocks and minerals into smaller pieces without changing their chemical composition. This occurs through physical forces such as freeze-thaw cycles, temperature changes, abrasion, and pressure.
Chemical weathering is the process in which rocks and minerals are broken down by chemical reactions that alter their composition. This can happen through processes such as oxidation, hydration, hydrolysis, and carbonation. Chemical weathering can result in the formation of new minerals and alteration of the rock's structure.
An example of physical weathering is when water freezes in cracks in a rock, causing it to expand and eventually crack. An example of chemical weathering is the reaction between water and limestone, which leads to the formation of caves and sinkholes.
Oil is a natural resource that is found inside of Earth. Oil can be used
Answer:
ti make gas to make things work and for stalk on the market
Explanation:
Which sources are reliable? Check all that apply.
A.an article discussing mineral resources written by the United States Geological Survey
B.a blog discussing sources of alternate energy written by a high school student
an advertisement for guided hikes and tours in Camping magazine
C.a study describing clinical trials of a new medication in the Journal of Medicinal Chemistry
D.an entry about common uses of metals in an encyclopedia that can be edited by the general public
Answer:
It is options A and D.
Explanation:
Did the assignment.
Final answer:
The reliable sources from the given options are the article by the United States Geological Survey and the study published in the Journal of Medicinal Chemistry, both of which are credible due to their authoritative and scholarly quality.
Explanation:
Among the given options, the following sources are considered reliable:
An article discussing mineral resources written by the United States Geological Survey (USGS), which is a government publication or agency website that provides credible and factual information.A study describing clinical trials of a new medication in the Journal of Medicinal Chemistry, which is a peer-reviewed academic publication containing work that has been evaluated by experts in the field.Reliable sources are essential for research and credible, trustworthy, and unbiased information. These sources guarantee that the evidence and facts presented support the conclusions drawn. The USGS is a reputable government agency known for its research and the publication of scholarly articles, making it a credible source. The Journal of Medicinal Chemistry is part of the peer-reviewed academic publications, which are often published by academic institutions or associations, ensuring a rigorous process of review that adds to their credibility.
Some sources, such as a blog by a non-expert or a publicly editable encyclopedia, lack authoritative oversight and therefore are not as trustworthy. To ensure credibility, consulting multiple reliable sources is recommended, and sources like reputable newspapers, magazines, academic journals, and government publications are generally reliable.
2zn+o2=2zno
how many moles of zinc are needed to make 6 moles of zinc oxide?
Answer:
[tex]\boxed{\text{6 mol}}[/tex]
Explanation:
(a) Balanced equation
2Zn + O₂ ⟶ 2ZnO
(b). Calculation
You want to convert moles of ZnO to moles of Zn
The molar ratio is 2 mol Zn:2 mol ZnO
[tex]\text{Moles of Zn} =\text{6 mol ZnO} \times \dfrac{\text{2 mol Zn}}{\text{2 mol ZnO}} = \text{6 mol Zn}\\\\\text{You need }\boxed{\textbf{6 mol of Zn}}\text{ to form 6 mol of ZnO}.[/tex]
To make 6 moles of zinc oxide, you would need 6 moles of zinc based on the balanced chemical equation 2Zn + O2 → 2ZnO.
Identify the balanced chemical equation: 2Zn + O2 → 2ZnOFrom the equation, 2 moles of Zn are needed to produce 2 moles of ZnO.Therefore, to make 6 moles of ZnO, you would need 6 moles of Zn.
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Strong conductivity of plasma allows it to act and react as ______________ and ____________ fields
Answer:
I think it is high and electric
Explanation:
Answer:
strong conductivity of plasma allows it to act and react as electric and magnetic fields.
What kind of relationship is shown in this picture
Answer:
The relationship shown is cordial relationship
What would the charge be on an ion of boron (B)?
Answer:
3+
Explanation:
Boron belongs to the 3rd group, the Boron family on the periodic table. It has an atomic number of 5. For neutral atoms of Boron, we have 5 electrons in them.
All atoms lose or gain electrons in order to achieve a perfect noble gas configuration which would give them stability. Noble gases are known to be stable and unreactive.
For Boron, it would readily want to lose 3 electrons so as to mimic a Helium, He atom. Helium is the first element in the noble gas series.
When Boron loses 3 electrons, a net charge of 3+ is left on the atom of Boron.
Which of the following sources of pollution would be the most difficult to track and regulate? a. lawn fertilizer runoff b. a waste treatment plant c. a factory d. a nuclear power plant Please select the best answer from the choices provided A B C D
a. lawn fertilizer runoff
Pollution as a result of lawn fertilizer runoff would be difficult to track and regulate due to the possible breadth of the area affected. Toxins can be spread throughout the land area as well as be carried downstream if near a water source. Sewer systems, rivers, lakes, ponds, etc. can all be negatively affected by lawn fertilizer runoff. Irrigation or rain water can carry toxins for many miles before the effects are detected. Tracing the source of the toxins would be difficult, especially in a highly populated area.
Lawn fertilizer runoff is a source of pollution that would be difficult to track and regulate as compared to others.
Why lawn fertilizer is difficult to track and regulate?Pollution that occurs as a result of lawn fertilizer runoff would be difficult to track and regulate because of the large size of the area. Toxins present chemical fertilizer can be spread throughout the land as well as also added to the water source.
So that's why we can say that Lawn fertilizer runoff would be more difficult to track and regulate as compared to others.
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Sharing electrons between atoms indicates an ionic bond.
A. True
B. False
The sharing electrons between atoms indicates an ionic bond is FALSE.
I hope this helps
The sharing of electrons between atoms indicates an ionic bond is option B. False.
Why does the sharing of electrons between atoms indicate an ionic bond is False?Ionic bonding is presented as the complete transfer of valence electrons, typically from a metal to a non-metal.In reality, electron density remains shared between the constituent atoms, meaning all bonds have some covalent character.The ionic or covalent nature of a bond is determined by the relative electronegativities of the atoms involved.The bond that involves the sharing of electron pairs between atoms is that what kind of atoms form covalent bonds with nonmetals why do metals not form covalent bonds they don't hold onto their electrons well.Hence, the sharing of electrons between atoms indicates an ionic bond is False.
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What is the possible reason for Trial B not obeying the law of conservation of mass?
A) Too much vinegar was used.
B) The reaction happened too fast.
C) Not enough baking soda was used.
D) The balloon-like device was not used in this trial.
I believe the answer is D. The ballon-like device was not used in this trial.
I am very sorry if this is not what you meant.
Atoms,which are always neutral in electric charge, contain electrons as well as protons and neutrons. An electron has an electrical charge of -1. If an atom has three electrons, infer how many protons it has.
Answer:
3
Explanation:
Since the atom has three electrons, it has a -3 electrical charge. Since atoms are neutral, 3 protons are needed to get the charge back to 0.
An atom maintains a neutral charge when it has an equal number of protons and electrons. Therefore, an atom with three electrons will have three protons. This principle is integral to the formation of ions when atoms gain or lose electrons.
Explanation:An atom is characterized by having an equal number of protons and electrons, thus maintaining a neutral charge. Protons carry a positive charge and electrons a negative one. Keeping in mind that a neutral atom has an equal number of both, if an atom has three electrons, it also has three protons.
In Chemistry, we know that atoms are neutral if they contain the same number of positively charged protons and negatively charged electrons. When the counts of these particles are unequal, the atom is electrostatically charged and is called an ion. This charge is calculated as: Atomic charge = number of protons - number of electrons.
For instance, if a neutral sodium atom (Z = 11) with 11 electrons loses one, it forms a cation with a 1+ charge (11 - 10 = 1+). Conversely, a neutral oxygen atom (Z = 8) gaining two electrons becomes an anion with a 2- charge (8 - 10 = 2-).
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A compound has the percent composition 47.40% Pd, 28.50% O, 21.40% C, and 2.69% H. Based on this information, which molecular formulas could represent the compound?
PdO2C2H3
Pd(O2CCH3)2
Pd(O2C2H3)3
PdO4C2H9
Pd2C8H12O8
Answer:
Pd(O₂CCH₃)₂
Explanation
Answer:
Pd(O2CCH3)2
Pd2C8H12O8
Explanation:
Given:
% Pd = 47.40
% O = 28.50
% C = 21.40
% H = 2.69
To determine:
Molecular formula of the compound containing Pd, O, C and H
Calculation:
Let the mass of the compound = 100g
Therefore based on the % compositions:
Mass of Pd = 47.40g
Mass of O = 28.50g
Mass of C = 21.40g
Mass of H = 2.69g
Atomic mass of Pd = 106.42 g/mol
Atomic mass of O = 15.99 g/mol
Atomic mass of C = 12.01 g/mol
Atomic mass of H = 1.00 g/mol
[tex]moles\ of\ Pd = \frac{47.40g}{106.42g/mol} =0.4454[/tex]
[tex]moles\ of\ O = \frac{28.50g}{15.99g/mol} =1.782[/tex]
[tex]moles\ of\ C = \frac{21.40g}{12.01g/mol} =1.782[/tex]
[tex]moles\ of\ H= \frac{2.69g}{1.00g/mol} =2.690[/tex]
Ratio:
[tex]Pd = \frac{0.4454}{0.4454} = 1.00\\\\O = \frac{1.782}{0.4454} = 4.00\\\\C = \frac{1.782}{0.4454} = 4.00\\\\H = \frac{2.690}{0.4454} = 6.039[/tex]
The empirical formula is : PdO4C4H6
Molecular formula = n(Empirical formula)
If n = 1
Molecular formula = PdO4C4H6 i.e. Pd(O2CCH3)2
If n= 2
Molecular formula = 2(PdO4C4H6)= Pd2O8C8H12
What is calcium used for in our body?
Answer:
It is necessary for contracting muscles, forming and strengthening bones and teeth, conducting nerve impulses throughout the body, clotting blood, maintaining a normal heartbeat
Answer:
calcium is essential for living organisms. it is vital for the body's good health.
Bone health
Vitamin D is helps the body absorb and retain calcium
it helps with muscle contraction
helps in normal blood coagulation (clotting)
it is a co-factor for many enzymes
helps the smooth muscles that surrounds the blood vessels; causes it to relax
Explanation:
At 98.66 kPa and 20 degrees C nitrogen has a solubility in water of .018 g/L. At 82.66 kPa and 20 degrees C, it’s solubility is .015 g/L. Does nitrogen obey the gas pressure-solubility law?
Yes it’s corrrct I swear
At 98.66 kPa and 20°C nitrogen has a solubility in water of .018 g/L. At 82.66 kPa and 20°C, it’s solubility is 015 g/L. Nitrogen obey the gas pressure solubility law.
What is Henry Law ?Henry's Law is a gas law states that the solubility of a gas in liquid is directly proportional to the pressure of that gas.
It is expressed as:
[tex]P_{i} = K_{H}\ X_{i}[/tex]
where,
[tex]P_{i}[/tex] = Partial pressure of the gas
[tex]X_{i}[/tex] = Mole fraction of gas
[tex]K_{H}[/tex] = Henry's Law constant
Which will not obey Henry Law ?Ammonia, Hydrogen halide (like Hydrochloric acid) and Hydrogen sulfide these gases does not obey Henry's Law.
Thus from the above conclusion we can say that At 98.66 kPa and 20°C nitrogen has a solubility in water of .018 g/L. At 82.66 kPa and 20°C, it’s solubility is 015 g/L. Nitrogen obey the gas pressure solubility law.
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Why is the blood that flows from the heart bright red rather than dark red?
Answer:
The oxygen-rich blood is then pumped out to your body through your arteries. It's bright red at this point. ... Your lips have a lot of these capillaries, which is why they're red. Your blood, now exhausted of its oxygen, is dark red as it now returns to your heart through your veins.
Explanation:
Answer:
The bright red blood leaving your heart is that color because it has more oxygen. The blood loses some oxygen and turns darker red before it returns to your heart.
Explanation:
How to find the valency of an element. 100 points and brainleiest for first answer. Plus thanks. Also how to ace chemistry exams that are tomorrow.
vertical colums tell the valence and the horozontal rows tell the amount of rings that the electrons circle in.
It is easy to find this by simply looking at the Group # (these are the column numbers).
Elements in Group 1 all have 1 electron in their valence shell, Elements in group 2 have 2 and so on...
If you mean how many shells there are then look at the Period # this is the horizontal groups) the Period # corresponds with the number of electron shells.
Elements in Period 2 have 2 electron shells, elements in Period 3 have 3 and so on...
To determine the valency of an element, one must consider its position in the periodic table and its electron configuration.
The valency of an element is the number of electrons it can lose, gain, or share when forming chemical compounds.
1. Main Group Elements (Groups IA to VIIIA, except He):
- Groups IA and IIA: The group number gives the valency. For example, elements in Group IA (e.g., Na) have a valency of 1, and those in Group IIA (e.g., Mg) have a valency of 2.
- Groups IIIA to VIA: The valency can be determined by subtracting the group number from the total number of valence electrons (8 for nonmetals, 18 for noble gases). For example, Nitrogen (Group VA) has 5 valence electrons, so its valency is 8 - 5 = 3.
- Halogens (Group VIIA): These elements have 7 valence electrons, so they have a valency of 1 (since they tend to gain one electron to achieve a full valence shell).
- Noble Gases (Group VIIIA): These elements typically have a valency of 0 because they have a full valence shell.
2. Transition Metals (Groups IB to VIIIB):
- These elements can exhibit multiple valencies, often corresponding to different oxidation states. Commonly, the valency is one or two less than the group number. For example, Iron (Fe, Group VIIIB) can have valencies of 2 or 3.
3. Inner Transition Metals (Lanthanides and Actinides):
- These elements also exhibit multiple valencies, usually +3 or +4.
4. Metalloids (B, Si, Ge, As, Sb, Te):
- Their valency can vary depending on the compound they form. For example, Silicon (Si) can have valencies of 4 or -4.
To ace chemistry exams, consider the following strategies:
- Understand Concepts: Ensure you have a solid grasp of the fundamental concepts rather than just memorizing facts.
- Practice Problems: Work through a variety of problems, especially those from past exams if available.
- Study Regularly: Spread out your study sessions over time rather than cramming the night before.
- Organize Study Material: Use flashcards, charts, and diagrams to help visualize and remember information.
- Form Study Groups: Discussing concepts with peers can provide new insights and clarify misunderstandings.
- Ask for Help: If you're struggling with certain topics, don't hesitate to ask teachers or tutors for clarification.
- Stay Healthy: Get enough sleep, eat well, and stay hydrated to ensure your brain is functioning optimally.
- Manage Time During the Exam: Allocate your time wisely, answering easier questions first and returning to more challenging ones later.
By applying these strategies and understanding the principles behind chemical reactions and the periodic table, you can improve your performance in chemistry exams.
Each Thursday the 11 kindergarten students in Miss Goodson's class are each allowed one slice of pie, one cup of orange juice, and two doughnut holes. The leftovers will be given to the custodian on the night shift.
How many slices of pie are left for the custodian?
slices of pie
How many cups of orange juice are left for the custodian?
cups of orange juice
How many doughnut holes are left for the custodian?
donut holes
How many were there to start off with?
The custodian receives 5 slices of pie, 7 cups of orange juice, and 11 doughnut holes as leftovers.
To calculate the leftovers for the custodian, we must first calculate how many items the students consume and subtract that from the total provided by the caterer:
Pies: There are 2 pies, each cut into 8 slices, for a total of 16 slices. With 11 students, 11 slices will be used, leaving 5 slices for the custodian.Orange juice: There are 18 cups of orange juice and each of the 11 students gets one cup, leaving 7 cups for the custodian.Doughnut holes: There are 33 doughnut holes. Each student eats 2 doughnut holes, so 11 students will consume a total of 22 holes, leaving 11 doughnut holes for the custodian.what happens to sodium sulphate in water
Answer:
It dissolves into the water
Na₂SO₄ + H₂O → 2Na₊_{aq} + SO₄²-_{aq}
Hope this helps :)
Have a great day !
5INGH
Explanation:
Type the correct coefficients for the following reaction: Al+S2 - > Al2S3
Answer:
2(Al 3+) + 3/2 O2 ---> Al2O3
Answer:
The correct coefficients for the following reaction:
[tex]4Al+3S2\rightarrow 2Al_2S_3[/tex]
Explanation:
[tex]Al+S2\rightarrow Al_2S_3[/tex]
Given reaction is not balanced.
According to Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that total mass on the reactant side must be equal to the total mass on the product side.
Stoichiometric coefficient is the numeral written before the chemical compound in a balance chemical reaction.
[tex]4Al+3S2\rightarrow 2Al_2S_3[/tex]
Arrange the levels of ecological organization from smallest to largest. (ecosystem, population, community, organism)
Answer:
organism, population, community, ecosystem
Explanation:
Answer: Organism, Population, Community, and lastly Ecosystem
Explanation: Organism is one living thing. Population is a group of organisms of one type that live together. Communities are populations that live together in an area. Ecosystem is a community with its non living surroundings.
Hope this helps :)
The weight of an object never changes.
True
False
the answer to your question is
true
Answer: False depending on what you do or what happens to the object but true if nothing happens to it
Explanation:
help me with this please i need chem help lol
Answer:
[tex]\boxed{\text{1. 0.47 mol; 2. 0.046 mol; 3 (a) 11.6 mol, 15.4 mol, (b) 2.31 mol, 3.08 mol, 0.770 mol}}[/tex]
Explanation:
1. Moles of Na
(a) Balanced equation
2Na + 2H₂O ⟶ 2NaOH + H₂
(b) Calculation
You want to convert moles of H₂ to moles of Na
The molar ratio is 2 mol Na:1 mol H₂
Moles of Na = 4.0 mol H₂ × (2 mol Na/1 mol H₂) = 8.0 mol Na
You need [tex]\boxed{ \text{8.0 mol of Na}}[/tex] to form 4.0 mol of H₂.
2. Moles of LiCl
(a) Balanced equation
2LiBr + Cl₂⟶ 2LiCl + Br₂
(b) Calculation
You want to convert moles of LiBr to moles of LiCl
The molar ratio is 2 mol LiBr:2 mol LiCl
Moles of LiCl = 0.046 mol LiBr × (2 mol LiCl/2 mol LiBr) = 0.046 mol LiCl
The reaction will produce [tex]\boxed{ \text{0.046 mol of LiCl}}[/tex].
3. Combustion of propane
C₃H₈ +5O₂ ⟶ 3CO₂ +4H₂O
(a) Moles of CO₂ and H₂O
Moles of CO₂ = 0.647 mol O₂ × (3 mol CO₂/1 mol C₃H₈) = 11.6 mol CO₂
Moles of H₂O = 3.85 mol O₂ × (4 mol CO₂/1 mol C₃H₈) = 15.4 mol H₂O
The reaction produces [tex]\boxed{ \text{11.6 mol of CO}_{2}}[/tex] and [tex]\boxed{ \text{15.4 mol of H}_{2}\text{O}}[/tex].
(b) Moles from O₂
Moles of CO₂ = 3.85 mol O₂ × (3 mol CO₂/5 mol O₂) = 2.31 mol CO₂
Moles of H₂O = 3.85 mol O₂ × (4 mol CO₂/5 mol O₂) = 3.08 mol H₂O
Moles of C₃H₈ = 3.85 mol O₂ × (1 mol C₃H₈/5 mol O₂) = 0.770 mol C₃H₈
The reaction produces [tex]\boxed{ \text{2.31 mol}}[/tex] of CO₂, [tex]\boxed{ \text{3.08 mol}}[/tex] of H₂O, and consumes [tex]\boxed{ \text{0.770 mol}}[/tex] of C₃H₈.
What does ethylene glycol do to the solution in a vehicle’s radiator? It raises the boiling point and lowers the freezing point. It lowers the boiling point and lowers the freezing point. It lowers the boiling point and raises the freezing point. It raises the boiling point and raises the freezing point.
Answer:
It raises the boiling point and lowers the freezing point.
Explanation:
It is used as antifreeze in the cooling circuits of internal combustion engines, that is, it is used to reduce the melting point of the solution.
By adding ethylene glycol I'm not only bringing the melting point to -13°C, but the boiling point of ethylene glycol is 197°C.
since these substances not only lower the freezing point but also increase the boiling point, they are also called a colligative agent
Answer:
The correct option is A) It raises the boiling point and lowers the freezing point.
Explanation:
Consider the provided information.
Ethylene glycol is often used for convective heat transfer.
The freezing point of pure ethylene glycol is about −12° C and boils at 198° C.
Due to the higher boiling point and antifreeze properties, it is used in a vehicle’s radiator.
Therefore, the correct option is A) It raises the boiling point and lowers the freezing point.
How many protons and electrons are present in Pb2+
Answer:
The number of protons of the Pb is 82.
The number of electrons of the Pb²⁺ is 80.
Explanation:
Each chemical element is characterized by the number of protons in its nucleus, which is called the atomic number Z.
The atomic number is used to classify the elements within the periodic table of the elements. In it, you can read in the upper left. In this case, the lead Pb has an atomic number of 82. This indicates that the number of protons of the Pb²⁺ is 82.
In every electrically neutral atom the number of protons in the nucleus is equal to the number of electrons in their orbitals. But in this case it is a cation, that is, it is a positively charged ion. A cation is formed when electrons are lost (which have a negative charge), thus acquiring the positive charge ion. In this case then, Pb²⁺ indicates that the cation has a +2 charge. So this means that 2 electrons have been lost. So, if it were electrically neutral, the lead Pb would have 82 electrons, but with the loss of two of its electrons, the number of electrons of the Pb²⁺ is 80.
There are 82 protons and 80 electrons in one Pb²⁺ ion. Lead (Pb) has an atomic number of 82.
The atomic number of an element represents the number of protons in its nucleus. Since lead (Pb) has an atomic number of 82, it means that a neutral lead atom has 82 protons.
When the Pb²⁺ ion is formed, it means that the atom has lost two electrons. The +2 charge indicates that the atom now has two more protons than electrons. Since electrons have a negative charge, losing two of them results in a net positive charge on the ion.
Since a neutral lead atom has 82 electrons, subtracting two electrons from it gives us 80 electrons in the Pb²⁺ ion. However, the number of protons remains the same at 82. The loss of electrons creates a positive charge, and the number of protons determines the element's identity.
In summary, the Pb²⁺ ion has 82 protons and 80 electrons. The 2+ charge indicates the loss of two electrons, resulting in a net positive charge on the ion.
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What is the number of moles in 500 L of He gas at STP
Answer:
22.3 mol
Explanation:
He is in STP conditions
This means that it is in standard conditions of temperature and pressure, under these conditions the pressure has a value of 1 atm and the temperature has a value of 273 K
To calculate the number of moles in 500L of He gas we use the ideal gas equation
[tex]P.V=n.r.T\\r(constant of ideal gases)= 0.082\frac{atm.L}{K.mol}[/tex]
We cleared the moles (n)
[tex]P.V=nr.T\\\frac{P.V}{r.T}=n\\\frac{1atm.500L}{0.082atm.L/K.mol.273K}=n\\\\22.3 mol=n[/tex]
The number of moles in 500 L of He gas at STP 22.3 mol
The number of moles in 500 L of helium (He) gas at standard temperature and pressure (STP) is approximately 22.32, based on the standard molar volume concept of chemistry.
Explanation:The number of moles in 500 L of He gas at STP can be determined using the standard molar volume, which states that at standard temperature and pressure (STP), one mole of any ideal gas occupies a volume of 22.4 L. In this case, to find the moles of helium gas, you would use the formula n = V/V_m, where n is the number of moles, V is the volume of the gas, and V_m is the molar volume at STP.
Substituting the given values into the equation: n = 500 L/22.4 L/mol = 22.32 moles.So, there are approximately 22.32 moles of helium gas in 500 L at STP.
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A rocket with its thruster on is speeding up towards the Moon. Therefore, what type of force is acting on the rocket? A. zero net force B. frictional force C. balanced force D. unbalanced force
Answer:
[tex]\boxed{\text{D. Unbalanced force}}[/tex]
Explanation:
If a rocket is at rest or moving at a constant velocity, the forces on it are balanced.
If the engines are ignited in flight, the thrust from the propellant gases unbalances the forces, and the rocket speeds up.
A is wrong. There can't be zero net force if the rocket is accelerating.
B is wrong. There is no friction in space.
C is wrong. The forces can't be balanced if the rocket is accelerating.
Which best describes why a liquid needs a container when a solid does not?
liquid is fluid in motion, needing to be contained. while a solid state of matter is as such and won't run down the cabinet
Answer:
When an element or substance is in a liquid state, the particles are joined by less attractive forces than in solids, for this reason the particles of a liquid can move freely.For this reason the particles of a liquid can move freely and need a recipient that contains them .
Liquids have a defined volume but with a variable shape, this means that liquids adopt the shape of the container but always occupy the same space
For example, if we have 4 L of water in a round container, its shape is round and now we put the water in a square container, its shape is now square but its volume is still 4 L (it continues to occupy the same space)