Answer:
Elements in same group have same chemical properties due to same number of valence electrons in valence shell.
Explanation:
Chemical properties are those properties which results in transforming the starting material to a entirely new substance with different chemical and physical properties. This transformation takes place after a chemical reaction. Hence, the chemical reactivity of some atoms is greater than the others and vice versa.
In periodic table it is found that the elements in the same group have almost same chemical behaviour. For example, elements of group 8 (or 18) are almost non reactive, while that of group 1 and group 7 are found very reactive and show same chemical behaviour like group 1 elements forms +1 ion while group 7 elements form -1 ions as the group 1 metals have single valence shell electron which upon losing allow the atom to attain stability and the halogen having 7 electrons in valence shell upon accepting one electron allow them to attain a octet of stability respectively.
Elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons in their outer shell, which governs their chemical behavior.
Explanation:Elements in the same group of the periodic table have similar chemical properties because they have the same number of valence electrons in their outermost shell. Valence electrons are primarily responsible for the chemical behavior of an element. They are involved in bonding with other atoms and determine the reactivity of the element. For example, Group 1 elements (alkali metals) each have one valence electron and behave very similarly, exhibiting high reactivity. On the contrary, Group 8 elements (noble gases) each have a full complement of eight valence electrons in their outermost shell making them extremely stable and unreactive.
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what is the equation form of the ideal gas law?
Answer:
The equation of state of n gram-moles of a perfect gas can then be written as pv/t = nR, in which R is called the universal gas constant.
Explanation:
Answer:
PV=nRT
Explanation:
Why does acetic acid have only one pKa value and our amino acids have two?
Answer:
Acetic acid ([tex]CH_{3}COOH[/tex]) can release only one single H+ ion .
Therefore we can say that acetic acid has only one pKa value.
Amino acids have one -COOH( carboxylic group) group and one -NH2 (amino group) group which can both release one single H+ ion.
Explanation:
Acetic acid ([tex]CH_{3}COOH[/tex]) can release only one single H+ ion .
Therefore we can say that acetic acid has only one pKa value.
Amino acids have one -COOH( carboxylic group) group and one -NH2 (amino group) group which can both release one single H+ ion.
In amino acids -[tex]NH_{2}[/tex] group becomes [tex]-NH_{3}^{+}[/tex] in the presence of acids.
in the presence of bases [tex]-COOH[/tex] becomes [tex]-COO^{-}[/tex]
Therefore two pKa values can be observed amino acids.
Final answer:
Acetic acid has only one pKa value because it is a monoprotic acid with a single proton to donate, creating one acid dissociation constant. Amino acids have at least two ionizable groups (amino and carboxyl groups), each capable of donating a proton under different conditions, resulting in two distinct pKa values for amino acids.
Explanation:
The question asks: Why does acetic acid have only one pKa value and our amino acids have two? Acetic acid, which is a monoprotic weak acid, contains only a single acidic proton. As such, it can donate only one proton to the solution, leading to a single acid dissociation constant or pKa value. This is contrasted with amino acids, which generally possess at least two ionizable groups (the amino group and the carboxyl group). Each of these groups can donate a proton under different pH conditions, resulting in two distinct pKa values. The differences in pKa values are influenced by the structure of the ionizable group and its relative ability to stabilize the resulting conjugate base. For example, the carboxyl group of an amino acid has a pKa around 2, reflecting its readiness to donate a proton and form a carboxylate anion, which is stabilized through resonance. The amino group typically has a pKa around 9, indicating its ability to accept a proton and form an ammonium ion. The microenvironment surrounding these ionizable groups, especially in proteins, can further affect their pKa values, leading to a variability depending on factors such as whether the amino acid is exposed to solvent or buried within a protein structure.
in the name, iron(III) oxide, the (III) represents
A) the number of iron atoms
B) the number of oxygen atoms
C) the electrical charge of oxygen
D) the electrical charge of iron
To attain stability the chemical bond is formed .
Chemical bond
It is a kind of linkage that binds one atom with the other .
The atoms do so in order to attain stable noble gas configuration .
To form chemical bond they either:
Loose electrons : when atoms loose electrons they acquire positive charge which is equal to the number of electrons lost .
Gain electrons: After gaining electrons they acquire negative charge which is equal to the number of electrons gained by an atom.
share electrons : With sharing no charges are develop .
In the above asked question when iron combines with oxygen it forms iron oxide : where iron looses 3 electrons and oxygen gains 2 electrons .That is the reason ,III here represents the electrical charge of iron
(04.06 LC)
Which of the following are lost or gained during a nuclear reaction?
Electrons and nucleus
Electrons and neutrons
Protons and electrons
Protons and neutrons
Answer:
the second one I think
Explanation:
hope you get it correct!
Answer:
a
Explanation:
How many atoms are there in NaCI
a knitting pattern for a blanket requires 1531 yards of yarn. A 2.00 x 10^2 m hank of speciality yarn cost $7.99. how much would it cost to make the blanket out of this yarn? (1 yard = o.9144 m)
Answer:
$55.998
Explanation:
Given data:
Total yard in blanket = 1531 yard
Price of 2.00×10² m = $7.99
Total cost for blanket = ?
Solution:
As it is given in question that,
1 yard = 0.9144 m
1531 × 0.9144 m = 1399.95 m
Total number of meters = 1399.95 m
Price of 2.00×10²(200) m = $7.99
Cost of one meter:
$7.99 / 200m = 1 m / x
x = $0.04
Now we will calculate the price of 1531 yard,
1399.95 m × $0.04 / 1m = $55.998
To make the blanket requiring 1531 yards of yarn using a speciality yarn sold in 200 meter hanks priced at $7.99 each, it would cost $55.93 after converting yards to meters and calculating the number of hanks needed.
The cost of making a blanket using the given yarn, we need to convert the required yarn from yards to meters to match the unit in which the speciality yarn is sold. Then, we can determine how many hanks of yarn are needed and calculate the total cost.
Conversion of Yards to Meters
Firstly, we convert the needed yarn for the blanket from yards to meters using the conversion factor 1 yard = 0.9144 meters.
1531 yards * 0.9144 meters/yard = 1400.0844 meters
Calculating the Number of Hanks Needed
Now, we calculate how many 2.00 x 102 meter hanks are required:
1400.0844 meters / (2.00 x 102 meters/hank) = 7 hanks (rounding up since you can't purchase a fraction of a hank)
Total Cost Calculation
Finally, the total cost is:
7 hanks * $7.99/hank = $55.93
Therefore, it would cost $55.93 to make the blanket out of this speciality yarn.
Would you want the starting reactants in an airbag system to have higher density or a lower density
Air bags are used as protective equipment in vehicles in which nitrate mixtures are filled with low density because, to inflate the gas , it needs higher volume.
What is airbag?In the event of a collision, airbags inflatable cushions installed in vehicles protect the occupants from being hit by the interior of the vehicle or by outside objects like other vehicles or trees.
As soon as a crash occurs, sensors begin to measure the impact force. The sensors transmit a signal to the inflators to swiftly fill the bags with gas if the accident is severe enough.
As long as they don't deploy in the course of a collision, airbags typically don't require maintenance. The stitch density will be lower for the inflation of the nitrogen gas inside the airbag, so lower density flexible fabric, such as nylon 6,6, is used.
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Which of the statements describes a chemical property?
Iodine(a purple solid) become a purple gas.
Helium is the lightest monatomic element.
Antacid tablet’s neutralize stomach acid.
Water freezes at 0 c.
Final answer:
Antacid tablets neutralizing stomach acid represents a chemical property, as it describes the substance's ability to undergo a chemical change and form different substances.
Explanation:
The statement among the given options that describes a chemical property is 'Antacid tablet’s neutralize stomach acid.' This statement describes the ability of a substance to undergo a specific chemical change. A chemical property involves a substance's ability to convert into a different substance, which is what antacid tablets do when they interact with stomach acid to produce salt and water, neutralizing the acid.
In contrast, the other statements describe physical properties: Iodine sublimating from a solid to a gas is a physical change because it changes state but does not become a new substance; helium being the lightest monatomic element describes its physical characteristic; and water freezing at 0°C is a physical change because it changes the state from liquid to solid without altering the chemical composition.
4.50 g of NaCl reacts with 10.00 g of AgNO3 to produce 7.93 g of AgCl. If the theoretical amount of AgCl that can be formed is 8.43 g, what is the percent yield?
Answer: 94.07%
Explanation:
Percentage yield can be calculated by the formula
%yield = Experimental yield/Theoretical yield x100
Experimental yield = 7.93g
Theoretical yield = 8.43
%yield = Experimental yield/Theoretical yield x100
%yield = 7.93/8.43 x 100 = 94.07%
Which of the following can be said about the boiling point of a liquid?
Explanation:
Boiling point
It is the temperature at which liquid changes into gaseous state .
or it can be defined as :
the temperature at which the vapor pressure of a liquid becomes equals to atmospheric pressure .
It depends upon many factors :
Temperature Pressure Inter molecular forces present Environmental pressure or vapor pressureTemperature : more is the temperature , more is the vapor pressure hence more is the boiling point .
Pressure : More is the pressure , ore is the boiling point or vice versa .
Intermolecular forces in particles of matter : more are the forces , less is the boiling point as they will have no escaping tendency .
The boiling point of water is : 100 degree celsius
Pick a one world factor to describe the benefits and limitations of Bromine
A one world factor to describe the benefits and limitations of Bromine are water purification compound.
Explanation:
Benefits of bromine
Bromine is used to make organobromo compounds. Dibromoethane is an agent for leaded gasoline, largely stepped out due to environmental considerations. In fire extinguishers, pharmaceutical products and insecticides, organobromines are used. Bromine applied in dyes production, water purification compounds, fumigants, sanitizes, medicinal, photography, flame proofing agents. In citrus beverages, bromine used as emulsifier.Limitations of bromine
Organic bromines are used as protecting and disinfecting agents, because microorganisms has its damaging effect. Once it is used in greenhouses and on farmland they can easily wash off to surface water, which has negative health effects on algae, daphnia, lobsters and fishes. The animals effected on DNA damage and nerve damage which can leads to development of cancer. Organic bromines can damage organs such as kidneys, liver, lungs. Ethylene bromine can cause cancer.
What demonstrates that this was a chemical change and not a physical change
Explanation:
There are some properties to demonstrate that this was a chemical change and not a physical change
What’s number 5? C7H6O2+02–>CO2+H20
Answer: If you were asking for it to be balanced then its 10 C7H602 + 70 O2 = 70 CO2 + 301 H20
Explanation: i hope this helped you
How efficient are electric engines
Answer:
Electric engines have efficiencies of roughly 90% whilst combustion engines about 10% to 30%. This is because combustion engines emit much more heat, which is always energy that is not used as work, and thus increases inefficiency.
Explanation:
what other animals do you know about that have unique forms of self defense
Answer:
there are certain spiders with some pretty weird/ cool self defense techniques
Scientists use the properties of seismic waves to figure out the structure of Earth's interior. For example, seismic waves travel faster through denser layers than through less dense layers. Also, P waves can travel through both solids and liquids, but S waves can travel through solids only.
Because P and S waves travel faster through the Earth's mantle than through Earth's crust, scientists know that the mantle is _______ and _______ than the crust.
A.
solid; less dense
B.
solid; denser
C.
liquid; less dense
Answer:
Solid; denser
Explanation:
5. A salvage operator recovered coins believed to be gold. A sample weighed 129.6 g and had a volume of 15.3 cm3. Were the coins gold (d= 19.3 g/cm3) or just yellow brass (d= 8.47 b/cm3)?
Answer:
Therefore the coins were of yellow brass.
Explanation:
A sample weighted 129.6 g and had a volume of 15.3 cm³.
[tex]Density =\frac{mass }{volume}[/tex]
Here mass= 129.6 g and volume =15.3 cm³.
[tex]Density =\frac{129.6}{15.3}[/tex] g/cm³
=8.47 g/cm³
Given that the density of gold = 19.3 g/cm³
and density of yellow brass = 8.47 g/cm³
Since the density of the sample is equal to the density of yellow brass.
Therefore the coins were of yellow brass.
The density of the coins sampled is 8.47 g/cm3, which is the same as the density of brass and much less than the density of gold, 19.3 g/cm3. The coins are therefore made of brass not gold.
Explanation:To determine if the coins are gold or brass, you need to calculate the density of the sample and compare it to the known densities of gold and brass. The density can be calculated by dividing the mass by the volume.
So, density = mass/volume = 129.6 g / 15.3 cm3 = 8.47 g/cm^3.
The density of the sample is identical to the density of brass, 8.47 g/cm^3, and much less than the density of gold, 19.3 g/cm3. Therefore, the coins are made of brass not gold.
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CARBON DIOXIDE DOES NOT EXIST IN A LIQUID STATE
UNTIL THE PRESSURE IS AT LEAST 5.1 ATMOSPHERES.
CONVERT THIS PRESSURE TO a) TORR, AND b) kPa.
1. What is viscosity?
2. True or False- All fluids can be characterized by their viscosity?
3. List 3 examples of fluids with high viscosity. (molasses, motor oil, honey)
4. List 3 examples of fluids with low viscosity. (water, juice, rubbing alcohol)
5. What is the question we are trying to answer in this lab?
6. Write a good hypothesis for this lab. (If, then statement)
7. List at least 2 safety concerns.
8. Why do you not want to mix water with the honey?
9. What can you do if the honey moves too fast or too slowly?
pls answer
Answer:
1. Viscosity describes how "thick" a liquid is. This is based on its resistance to flow. Viscosity is measured in 'poise' (written P)
2. Fluids can be described as having great, or little viscosity.
3. Tar, Glycerol, Sulfric Acids
4. Mercury, Blood, Dilute polyethylene oxides
(Can't answer #5-9 because I don't know what lab you are doing.)
Why would a model be useful?
because the model makes the concepts, easier to understand
because the model is easy to put together and to use
because the model prevents other scientists from asking questions
because the model requires the audience to pay full attention to it
O
Answer: B
.
Explanation:
Answer:
A - Because the model makes concepts easier to understand.
Explanation:
A visual representation can be a great help in figuring something out. Besides, the other answers don't make much sense.
Hope this helps! (and sorry it's late ^^'' )
How many moles of chromium (lll) nitrate are produced when chromium reacts with 0.85 moles of lead (IV) Nitrate to produce chromium (lll) nitrate and lead?
Answer:
1.133 moles of chromium (lll) nitrate are produced.
Explanation:
[tex]4Cr+3Pb(NO_3)_4\rightarrow 4Cr(NO_3)_3+3Pb[/tex]
Moles of lead(IV) nitrate = 0.85 mole
According to recation, 3 moles of lead(IV) nitrate gives 4 moles of chromium (III) nitrate.
Then 0.85 moles of lead(IV) nitrate will give:
[tex]\frac{4}{3}\times 0.85 mol=1.133 mol[/tex] of chromium (lll) nitrate.
1.133 moles of chromium (lll) nitrate are produced.
Explain how chemists can state with
certainty that no one will discover an element
that would appear on the periodic table
between sulfur (S) and chlorine (Cl)
Answer:
The nucleus of a sulfur atom contains 16 protons.
The nucleus of a chlorine atom contains 17 protons.
Explanation:
Atoms are arranged in the Periodic Table according to the number of protons in their nuclei — their atomic numbers.
A proton is an integral particle — you can't have half a proton.
S and Cl are adjacent in the Periodic Table, so it is impossible to find an element that will fit between them.
Which statement best describes how chemical equations demonstrate conservation of mass?
The number of reactants is the same as the number of products,
OB. The compounds are the same on each side of the reaction
c.
The number of atoms of each element is the same on each side of the equation
D.
The state of matter is the same on each side of the equation
Reset
Next
The number of reactants is the same as the number of products is the best statement that describes the conservation of mass in chemical equation
Explanation:
The conservation of mass conveys that the mass of an seperate system is neither destroyed nor created by the chemical reactions. Therefore there should be the same amount of matter when compared to the reactant and product side. If the reaction exists by satisfying the above condition it is said to be the balanced chemical equation. The Lavoisier stated the law on conservation of mass.What is the change of state that occurs in the condenser
Answer:
Explanation:
The high temperature refrigerant passes into a condenser coil. As the vapor refrigerant travels through the coil, air from a fan passes over the coil to cool the vapor refrigerant. As the vapor cools it condenses and becomes a liquid, which is referred to as a change of state.
Two or more substances in variable proportions, where the composition is variable thoughtout are ?
Answer:
a compound
Explanation:
A substance composed of two or more pure substances mixed together in variable proportions, with variable composition throughout, is called a heterogeneous mixture. These mixtures can have components that retain their individual chemical identities, which can often be physically separated.
When two or more pure substances are mixed together in variable proportions, without any chemical bonding between them, the resulting substance is known as a mixture. These mixtures where the composition is not consistent throughout are called heterogeneous mixtures. Examples include sand and water, or oil and water. Unlike a compound, where elements are in fixed proportions and chemically bonded, the substances in a mixture retain their individual chemical properties and can often be physically separated.
Mixtures stand in contrast to compounds, which are substances composed of two or more elements in fixed proportions and can only be separated into their constituent elements by chemical methods.
The concept of composition variables, such as the number of moles of each component, is crucial for describing the properties of mixtures. Air, with its variable amounts of nitrogen and oxygen, is an example of a mixture with each component retaining its characteristic properties.
What is the kinetic energy of the ball as it is half way through the fall?
As the ball falls towards the ground, its gravitational potential vitality is changed into active vitality. The dynamic vitality of an item is the vitality it has because of its movement.
Explanation:
As the ball falls towards the ground, its gravitational potential vitality is changed into active vitality. The motor vitality of an item is the vitality it has because of its movement. At the point when the ball has arrived at its absolute bottom, its potential vitality is zero, and its motor vitality is more noteworthy.
Since vitality can't be crushed, the ball's most prominent potential vitality is equivalent to its most prominent motor vitality. K.E. = J, which is, obviously, equivalent to its underlying potential vitality.
which compound of gold will produce the least mass of gold?
1)Gold(I) oxide 3)Gold(I)sulfide
2)Gold(III) oxide 4)Gold(III)sulfide
Au₂S₃
Explanation:
Given compounds:
Gold(I) oxide = Au₂O
Gold(I)sulfide = Au₂S
Gold(III) oxide = Au₂O₃
Gold(III)sulfide = Au₂S₃
Problem: compound with the least mass of Gold.
To solve this problem, we simply find the mass percentage of gold in the given compounds.
Molar mass of Au₂O = 2(197) + 16 = 410g/mole
Molar mass of Au₂S = 2(197) + 32 = 426g/mole
Molar mass of Au₂O₃ = 2(197) + 3(16) = 442g/mole
Molar mass of Au₂S₃ = 2(197) + 3(32) = 490g/mole
The molar mass of gold in all the compound is 394g/mole
Mass percentage of gold in Au₂O = [tex]\frac{394}{410}[/tex] x 100 = 96.1%
Mass percentage of gold in Au₂S = [tex]\frac{394}{426}[/tex] x 100 = 92.5%
Mass percentage of gold in Au₂O₃ = [tex]\frac{394}{442}[/tex] x 100 = 89.1%
Mass percentage of gold in Au₂S₃ = [tex]\frac{394}{490}[/tex] x 100 = 80.4%
Au₂S₃ is the least mass of gold in it
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Answer:
Explanation:
Given compounds:
Gold(I) oxide = Au₂O
Gold(I)sulfide = Au₂S
Gold(III) oxide = Au₂O₃
Gold(III)sulfide = Au₂S₃
Problem: compound with the least mass of Gold.
To solve this problem, we simply find the mass percentage of gold in the given compounds.
Molar mass of Au₂O = 2(197) + 16 = 410g/mole
Molar mass of Au₂S = 2(197) + 32 = 426g/mole
Molar mass of Au₂O₃ = 2(197) + 3(16) = 442g/mole
Molar mass of Au₂S₃ = 2(197) + 3(32) = 490g/mole
The molar mass of gold in all the compound is 394g/mole
Mass percentage of gold in Au₂O = x 100 = 96.1%
Mass percentage of gold in Au₂S = x 100 = 92.5%
Mass percentage of gold in Au₂O₃ = x 100 = 89.1%
Mass percentage of gold in Au₂S₃ = x 100 = 80.4%
Au₂S₃ is the least mass of gold in it
Tissue engineering is beneficial for which of the following reasons?
A.Stem cells are more powerful than any device.
B.Stem cells are stronger than any other material.
C.Stem cells automatically create a perfect organ shape and size.
D.Using a patient's own cells increases the likelihood of biocompatibility.
Tissue engineering is beneficial as stem cells automatically create a perfect organ shape and size, therefore, here option C is correct.
What is tissue engineering?Tissue engineering is a biomedical engineering discipline that coordinates science with engineering to make tissues or cell items outside the body or to utilize acquired information to more readily deal with the maintenance of tissues inside the body.
Numerous new cell treatments are being fostered that make difficulties for designing tissue capability.
The execution of cell treatments and unions in the facility requires the acknowledgment and goal of a few troublesome issues.
Tissue engineering is beneficial as, stem cells automatically create a perfect organ shape and size, hence option C is correct.
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How is a new moon the same as or different from a total lunar eclipse
Explanation:
Both new moon and lunar eclipse occur when the moon is in the same plane the sun and the earth. However, both are different because of the relative position of the moon in its orbit – relative to earth. In a new moon, the moon is in between the earth and the sun, while in a lunar eclipse, the earth us in between the moon and the sun.
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Answer:
A new moon and lunar eclipse occur when the moon is in the same plane as the earth and the sun. The moon is between the earth and the sun on a new moon. The earth is between the moon and the sun on a lunar eclipse.
Explanation:
Avogadro defined one mole of carbon-12 atoms to have a mass of exactly 12.0 grams. Calculate the number of hydrogen atoms in 1 mole.
A) 1.38 x 1025 atoms
B) 1.66 x 1024 atoms
C) 3.98 x 1023 atoms
D) 6.02 x 1023 atoms
The term mole concept is used here to determine the number of hydrogen atoms in one mole. The number of 'H' atoms in one mole is 6.022 x 10²³ atoms. The correct option is D.
What is mole?One mole of a substance is defined as that amount of it which contains as many particles or entities as there are atoms in exactly 12 g of Carbon - 12. The number of entities present in one mole of a species equals 6.022 x 10²³ . This value is called the Avogadro number.
The Avogadro number also called the Avogadro constant. It is represented as N₀. One gram atomic mass of any element contains Avogadro number of atoms. The number of atoms in 12 g of C-12 is also 6.022 x 10²³.
1 gram atom of hydrogen (i.e., 1.008 g) contains Avogadro number of atoms.
Thus the correct option is D.
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Final answer:
One mole of any substance contains Avogadro's number of particles. Hence, 1 mole of hydrogen atoms contains 6.02 x 10^23 atoms.
Explanation:
The question asks to calculate the number of hydrogen atoms in 1 mole. Avogadro's number, defined as the number of particles in 1 mole of a substance, is 6.022 x 1023 particles/mole. This principle is based on the standard that 1 mole of carbon-12 atoms has a mass of exactly 12.0 grams and contains 6.022 x 1023 carbon atoms. Given that 1 mole of any substance contains the same number of entities as there are in 1 mole of carbon-12, one mole of hydrogen atoms, regardless of its lesser mass compared to carbon-12, also contains exactly 6.022 x 1023 atoms. Therefore, the correct answer is D) 6.02 x 1023 atoms.