A molecule of a compound is composed of at least two types of atoms.
Explanation:
A molecule is defined as when two or more atoms of an element combine together by the bonds by sharing the electrons as O^2 (oxygen molecule)
A compound is a molecule when two different types of atom joined by chemical bonds as covalent, ionic or coordinate bonds as NH^3 ( ammonia)
Answer:
C- A molecule of a compound is composed of at least two types of atoms
Explanation:
just did the quiz
chemical reactions can be detected by changes in____. select all that apply. a)temperature.
b)density of the products compared to the reactants.
c)color.
d)overall mass of the products compared to the mass of the reactants.
Which of these is an indication that a chemical reaction has occurred?
Select all that apply:
melting of a substance
boiling of a substance
formation of a new gas
formation of a precipitate
a new smell is given off
heat is released
Answer: Formation of a new gas
Formation of a precipitate
A new smell is given off
Heat is released
Explanation: A chemical reaction exhibits the following characteristics: formation of new substance, heat emission is an exothermic process which is due to chemical reactions
Precipitate formation occurs when insoluble substances are formed in an ionic compound solution.
And smells or odor are caused by the production of new substances.
there are 3.45 moles of (NH_4)_2 SO_4, how many grams is this?
Answer:
455.4 g (NH_4)2 SO_4
Explanation:
Given:
no of moles of (NH_4)2 SO_4 , n=3.45 moles
To find:
The mass (w) of (NH_4)2 SO_4 in 3.45 moles (n)of it.
Molar mass (M) of (NH_4)2 SO_4 = 132 g
No of moles n is given by the formula;
[tex]n =\frac{w}{M}[/tex]
n is no. of moles
w is mass of the compound
M is the molar mass of the compound
Substituting the values in the formula,
[tex]3.45=\frac{w}{132}[/tex]
w=3.45 × 132=455.4g
What is the first step of the scientific method?
O
O
A. Make a prediction
B. Form a hypothesis
C. State the question
O D. Conduct an experiment
ShE MIT
Final answer:
The first step of the scientific method is to make observations. Through observations, scientists gather information about a natural phenomenon or problem that they want to investigate.
Explanation:
The first step of the scientific method is to make observations. Through observations, scientists gather information about a natural phenomenon or problem that they want to investigate.
For example, a student arrives at class and notices that the classroom is too warm. This observation leads to a question, 'Why is the classroom so warm?'
By making careful observations, scientists can then proceed to form a hypothesis, which is the next step of the scientific method.
A compressed gas cylinder ar 135 atm and 23°C is in a room wheree a fire occurs the fire raises the temperature of the gas to 475°C. What is the new pressure in the cylindar
Answer: 341.15atm
Explanation:Please see attachment for explanation
The new pressure in the cylinder after the temperature increase to 475°C is approximately [tex]\( 341.53 \)[/tex] atm.
The new pressure of the gas cylinder after the temperature increase, we can use the combined gas law, which relates the initial and final states of a gas under changing conditions of temperature and pressure, assuming constant volume.
The combined gas law is given by.
[tex]\[ \frac{P_1 \cdot V_1}{T_1} = \frac{P_2 \cdot V_2}{T_2} \][/tex]
where.
[tex]- \( P_1 \) and \( T_1 \)[/tex] are the initial pressure and temperature.
[tex]- \( P_2 \) and \( T_2 \)[/tex] are the final pressure and temperature.
[tex]- \( V_1 \) and \( V_2 \)[/tex] are the initial and final volumes respectively assuming constant volume here.
Given.
- Initial pressure, [tex]\( P_1 = 135 \)[/tex] [tex]atm[/tex].
- Initial temperature, [tex]\( T_1 = 23 \) °C = \( 23 + 273.15 = 296.15 \)[/tex] K.
- Final temperature, [tex]\( T_2 = 475 \) °C = \( 475 + 273.15 = 748.15 \)[/tex] K.
We need to find [tex]\( P_2 \)[/tex], the final pressure.
First, let's rearrange the combined gas law to solve for [tex]\( P_2 \).[/tex]
[tex]\[ P_2 = \frac{P_1 \cdot T_2}{T_1} \][/tex]
Now, substitute the given values.
[tex]\[ P_2 = \frac{135 \cdot 748.15}{296.15} \][/tex]
Calculate [tex]\( P_2 \).[/tex]
[tex]\[ P_2 = \frac{101135.25}{296.15} \][/tex]
[tex]\[ P_2 \approx 341.53 \, \text{atm} \][/tex]
In a particular type of cat, coat color follows the dominant/recessive pattern of inheritance. The allele for a brown coat (B) is dominant to the allele for a white coat (b).
One of Mariam's cats is homozygous dominant (BB) and the other cat is heterozygous (Bb). Which of the following is true about Mariam's cats?
Answer:
even though I am missing the question I believe that the correct answer to the question is; his cats will be brown (Dominant)
Explanation:
this statement is true to the fact that on of his cats has the homozygous dominant gene BB. For their to be a chance of a white cat as an offspring both cats would either have to be Hetrozygous (Bb) or Homozygous recesssive (bb)
How many atoms of each element are present in the nucleotide adenine:C9H14N3O8P
Answer:
not sure but i think that there are 35 atoms.
Have a great day!
Question 15 of 32
1 Point
Which of the following pairs of elements will form ionic bonds with each
other?
The Periodic Table
O A. Lithium (Li) and iodine (1)
O B. Silver (Ag) and silver (Ag)
O C. Bromine (Br) and bromine (Br)
O D. Carbon (C) and chlorine (CI)
Lithium and Iodine will likely form an ionic bond. Lithium, a metal, will lose an electron while Iodine, a non-metal, will gain that electron, resulting in a stable electron configuration and the creation of an ionic bond.
Explanation:The formation of ionic bonds typically occurs between a metal and a non-metal element due to the transfer of electrons from the metal to the non-metal. In this case, Lithium (Li) and Iodine (I) will likely form an ionic bond. Lithium, a metal, tends to lose an electron while iodine, a non-metal, tends to gain an electron, to achieve a stable electron configuration. This exchange of electrons leads to the formation of an ionic bond with Lithium becoming a positive ion (Li+) and Iodine becoming a negative ion (I-).
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A sample of gold (Au) has a mass of 72.04 g. A) Calculate the number of moles of gold (Au) in the sample. Show your work please
A sample of gold (Au) has a mass of 72.04g. Calculate the number of atoms of gold (Au) in the sample. (Use your answer from Part A.) Show your work
Answer:
A. Number of moles, n = Reacting mass / Molecular mass
n = 72.04/ 196.966
n = 0.366 mole
Hence, the number of moles of gold (Au) in the sample is 0.366 mole
B. the number of atoms of gold (Au) in the sample is expressed as
= 0.366 * 6.03*∧1023
= 2.20698E35 atoms
Explanation:
Using the picture below, compare and contrast the plant cell and the animal cell (What do they have different? What do they have in common
Answer:
Animal cell lacks chloroplasts and a cell wall
Explanation:
Unlike animal cells, plant cells have chloroplasts and a cell wall. In a plant cell, the chloroplasts work to use photosynthesis in order to turn light into energy for the plant cell. Animal cells do not utilize light energy, and therefore do not carry out photosynthesis and do not have chloroplasts.
Additionally, the plant cell has a protective cell wall and a cell membrane, while animal cells only have a cell membrane. This is because the plant cells' cell wall provides additional strength and protection against outside factors, such as osmosis.
Both plant and animal cells have nuclei and cytoplasm, but plant cells have additional structures like cell walls, chloroplasts, and a large central vacuole. Animal cells lack these structures.
Explanation:Plant cells and animal cells have both similarities and differences. Both types of cells have nuclei and cytoplasm. However, plant cells have cell walls and chloroplasts, which allow for photosynthesis, while animal cells do not have these structures. Additionally, plant cells have a large central vacuole, plastids, and plasmodesmata, which are not found in animal cells.
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Which of the following statements is true? An element is made of only one type of atom. Positively charged atoms have gained protons. A molecule must be made of two or more elements. Electrons and neutrons are found in the nucleus of an atom.
Answer:
The true statement is
An element is made of only one kind of atom.
Explanation:
An element is made of only one kind of atom. For example if we take element carbon it is made of carbon atoms only .
The other atatements are false.
Positively charged atoms lose electrons and don't gain electrons.
A molecule can also be made of two or more atoms of the same element. Eg H₂, P₄, Cl₂ etc.
Protons and neutrons are found in the nucleus of the atom and electrons are present outside the nucleus.
When a person uses a iron to remove wrinkles from a shirt. Why does heat travel from iron to the shirt
Answer: it transfers through conduction, the molecules of the iron are bumping into the molecules of the shirt, giving them energy.
Explanation: conduction is Energy transferred by touching.
A(n)_____ is a bond that forms when electrons are transferred from one atom to another.
Help I need this by tmr
Answer: Ionic bond
Explanation: Ionic bonding is the transfer of electrons form least electronegative atom to a more electronegative one. Ionic bonds are commonly formed between a metal an electron donor and a non metal an electron acceptor. Since nonmetals have higher ionization energy and electronegativity electrons are transferred to them.
Answer:
Ionic bond
Explanation:
When solid NH4HS and 0.28 mol NH3(g) were placed in a 2 L vessel at 24◦C, the equilibriumNH4HS(s)⇀↽NH3(g) + H2S(g)for which Kc= 0.00016, was reached. What is the equilibrium concentration of NH3?Answer in units of mol/L
Answer:
The equilibrium concentration of NH3 = 0.141 mol/L
Explanation:
The balanced equation for the reaction is :
[tex]NH_{4}HS(s)\rightleftharpoons NH_{3}(g)+H_{2}S(g)[/tex]
Here , you have to write the Kc carefully "Don't write SOLID substance in the expression of Kc"
Kc = equilibrium constant for concentration( Solid are not included in the expression)
So, Kc can be written as :
[tex]Kc=[NH_{3}][H_{2}S][/tex]
Now , look at the equation ,
[tex]NH_{4}HS(s)\rightleftharpoons NH_{3}(g)+H_{2}S(g)[/tex]
Let x moles are dissociated from it at equilibrium
[NH4HS](s) NH3 H2S
1 0.28 0 (Initial moles)
1-x x + 0.28 x (Moles at equilibrium)
Calculate the concentration at equilibrium :
Moles of NH3 = 0.28 mol
The concentration of NH3 is calculated using :
[tex]Concentration=\frac{Moles}{Volume(L)}[/tex]
[tex][NH_{3}]=\frac{0.28 +x}{2}[/tex]
Similarly concentration of H2S
[tex][H_{2}S]=\frac{x}{2}[/tex]
Put the value in given equation:
[tex]Kc=[NH_{3}][H_{2}S][/tex]
Kc = 0.00016
[tex]0.00016=\frac{(0.28 +x)(x)}{2\times 2}[/tex]
[tex]0.00016\times 4 =(0.28 +x)(x)[/tex]
[tex]6.4\times 10^{-4}=0.28x +x^{2}[/tex]
[tex]x^{2}+.28x-6.4\times 10^{-4}=0[/tex]
Use the formula of quadratic equation to solve the value of [tex]x=\frac{-b\pm \sqrt{b^{2}-4(ac)}}{2a}[/tex]
Here, b= 0.28 , c= -.00064 and a = 1
you get ,
x = 0.002267 mol/L
or
[NH3] = (x + 0.28)/2 = 0.002267 + 0.28
[NH3] = 0.2822/2 mol/L
[NH3] = 0.141 mol/L
What can we learn by the number of electrons on the outer energy level of an atom?
Physical properties such as color and texture
Physical properties such as mass and density
Chemical properties such as its ability to form chemical bonds
Chemical properties such as boiling point and melting point
Answer:
The answer is chemical properties such as its ability to form chemical bonds
Explanation:
The statement that represents what can be learned by the number of electrons on the outer energy level of an atom is chemical properties such as its ability to form chemical bonds.
What are valence electrons?Valence electrons in chemistry refers to any of the electrons in the outermost shell of an atom that is capable of forming bonds with other atoms.
The valence electrons of an atom is responsible for its ability to form chemical bonds with other atoms.
The valence electrons of an atom gives no information on the physical property of the element.
Therefore, the statement that represents what can be learned by the number of electrons on the outer energy level of an atom is chemical properties such as its ability to form chemical bonds.
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what is the difference between a measuring and a holding device?
Final answer:
A measuring device is used to determine physical quantities with accuracy and precision, while a holding device is used for support and stability.
Explanation:
In physics, a measuring device is used to determine physical quantities such as length, mass, volume, and voltage. These devices are designed to provide accurate and precise measurements by using standardized units and scales. Examples of measuring devices include rulers, balances, graduated cylinders, and voltmeters.
A holding device, on the other hand, is used to secure or support an object or component during a process or experiment. It is not intended for measuring physical quantities but rather for stabilizing or immobilizing an object in a particular position or orientation. Common examples of holding devices are clamps, vices, and fixtures.
So, the main difference between a measuring and a holding device is their purpose. A measuring device is used for measurement and quantification, while a holding device is used for support and stability.
An old (pre-1987) penny is nearly pure copper. If such a penny has a mass of 3.3 g, how many moles of copper atoms would be on one penny?
Answer:
Approximately 3.1 × 10²².
Explanation:
Start by considering: how many moles of copper atoms in this 3.3-gram coin?
To answer that, it would be necessary to know the mass of one mole of copper atoms. The mass (in grams) of one mole of copper atoms is numerically equal to the relative atomic mass of copper. Look up the relative atomic mass of copper on a modern periodic table.
Cu: 63.546.In other words, the mass of one mole of copper atoms is equal to 63.546 grams. Hence, the number of moles of copper atoms in the 3.3-gram coin would be equal to
[tex]\displaystyle n = \frac{m}{M} = \frac{3.3}{63.546} \approx 0.0519309 \; \rm mol[/tex].
How many copper atoms would that be? Avogadro's Constant gives the number of particles in one mole.
[tex]N_A \approx 6.023\times 10^{23}\; \rm mol^{-1}[/tex].
Since there are approximately [tex]0.0519309 \; \rm mol[/tex] copper atoms, the number of copper atoms would be
[tex]\displaystyle N = \frac{n}{N_A} \approx \frac{0.0519309}{6.023\times 10^{23}} \approx 3.3 \times 10^{22}[/tex].
The number of moles of copper in a penny of mass 3.3g is about 0.052 moles. By multiplying by Avogadro's number, we find that there are approximately 3.1 × 10²² copper atoms in the penny.
Explanation:To determine the number of moles of copper in a single penny, you need to know the atomic weight of copper and Avogadro's number. The atomic weight of copper is approximately 63.5 g/mol. So, given that the mass of the penny is 3.3 g, we can use the following conversion to find the number of moles:
moles of copper = mass of copper / atomic weight of copper
moles of copper = 3.3 g / 63.5 g/mol = 0.052 moles.
To find the number of copper atoms, you would multiply the number of moles by Avogadro's number (6.022 × 10²³ atoms/mol), thus:
number of copper atoms = number of moles * Avogadro's number
number of copper atoms = 0.052 moles * 6.022 × 10²³ atoms/mol ≈ 3.1 × 10²² copper atoms.
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the grocery store sells ground beef that is labeled 20% fat. How many grams of fat would be labeled in 1.3 pounds of ground beef
Answer:
Grams of fat would be labeled in 1.3 pounds of ground beef are :
= 117.94 grams
Explanation:
STEP 1: Convert pound into grams:
1 pound = 453.6 grams (learn this)
STEP 2 : Calculate the number of grams in 1.3 pound.
Multiply the number by 1.3
1.3 pound = 1.3 x 453.6 grams
1.3 pound = 589.68 grams
STEP 3: Calculate the mass in 20 % percentage of sample.
[tex]20\% of\ x=x\times \frac{20}{100}[/tex]
Here x = 589.68 grams
[tex]20\%\ of\ 589.68 =589.68\times \frac{20}{100}[/tex]
[tex]20\%\ of\ 589.68 =117.93grams[/tex]
= 117.94 grams
To calculate the fat content in 1.3 pounds of 20% fat ground beef, convert the weight to grams and multiply by the fat percentage, resulting in approximately 117.934 grams of fat.
To determine how many grams of fat are in 1.3 pounds of ground beef labeled as 20% fat, we first need to convert the weight from pounds to grams, since fat content is typically labeled in grams.
Step-by-Step Calculation
Convert pounds to grams: 1 pound (lb) is approximately 453.592 grams (g). Thus, 1.3 lbs is equal to 1.3 × 453.592 g.
Calculate the total grams of beef: 1.3 × 453.592 g = 589.669 g of beef.
Calculate the fat content: Since the ground beef is 20% fat, we determine the fat content by multiplying the total weight of the beef by the percentage of fat. That is 0.20 × 589.669 g.
Find the amount of fat in grams: 0.20 × 589.669 g = 117.934 g of fat.
Therefore, there would be 117.934 grams of fat in 1.3 pounds of ground beef with 20% fat content.
How many grams are in 5.6 moles of C6H6?
Answer: 437 g C6H6
Explanation: Solution attached:
1 mole of C6H6 is equal to its molar mass 78 g C6H6.
5.6 moles C6H6 x 78 g C6H6 / 1 mole C6H6
= 437 g C6H6
The mass of C₆H₆ is 436.8 grams.
Given:
Moles of C₆H₆ =5.6 moles
To find:
Mass of C₆H₆ =?
Number of moles:It is defined as given mass over molar mass.
Number of moles = Given mass / Molar mass
Molar mass of C₆H₆ = 12*6 + 1*6 = 72+6= 78 g/mol
Mass = Number of moles * Molar mass
Mass = 5.6 moles * 78 g/mol
Mass = 436.8 grams
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The sun contributes to the formation of fossils files by
Answer
and
Explanation:
All the energy in oil, gas, and coal originally came from the sun, which is captured through photosynthesis. The same way that we burn wood to release energy that the trees capture from the sun, we burn fossil fuels to release the energy that ancient plants had captured from the sun.
Hope this answered your question!
Please let me know how I did.
Plutonium-239 has a half-life of 24,100 years. How long will it take a 1-kilogram sample to decay to 125 grams?
72,300 years are required to reduce Plutonium-239 from 1000 g to 125 g.
Explanation:
It is known that 1 kg of anything is equal to 1000 g of the same compound. Also the half life of any radioactive element meant decay of half of the weight of that element after the half life time.
As here the half life time of Plutonium-239 is said to be 24,100 years. This means after the first interval of 24,100 years, the plutonium-239 of 1000 g will reduce to 1000/2=500 g of plutonium. That means only 500 g of plutonium 239 will be present after the completion of first interval of 24,100 years.
Similarly, the second interval of 24,100 years will again reduce the mass from 500 g to 250 g. Then the third interval of 24,100 years will reduce the mass from 250 g to half of it i.e., 125 g of plutonium. Thus, as per the question, the time taken to reduce 1 kg of plutonium to 125 g of plutonium will require three intervals of half life time. Thus , the total time required to reduce the concentration from 1000 g to 125 g is No.of intervals× Half life time.
Total time required to reduce the weight from 1000 g to 125 g = No.of interval ×Half life time
Total time = 3 ×24100 years = 72,300 years.
So 72,300 years are required to reduce Plutonium-239 from 1000 g to 125 g.
It will take 72,300 years for a 1-kilogram sample of Plutonium-239 to decay to 125 grams. We calculate this by determining that three half-lives will occur for the sample to reach the final mass, with each half-life being 24,100 years.
Explanation:Calculating the Time for Plutonium-239 DecayTo calculate how long it will take a 1-kilogram sample of Plutonium-239 to decay to 125 grams, we can use the concept of half-lives. Since Plutonium-239 has a half-life of 24,100 years, we know that every 24,100 years, half of the initial amount will remain.
The process of decay is exponential, and we can find the number of half-lives by the equation:
Number of half-lives (n) = log(final amount / initial amount) / log(0.5)
Filling in the amounts (125 grams final amount, 1000 grams initial amount), we get:
Number of half-lives (n) = log(125 / 1000) / log(0.5) = 3
Therefore, the sample will undergo three half-lives to reach the final mass of 125 grams. To find the total time, we multiply the number of half-lives by the half-life of Plutonium-239:
Total time = Number of half-lives × Half-life of the isotope = 3 × 24,100 years = 72,300 years.
It will take 72,300 years for a 1-kilogram sample of Plutonium-239 to decay to 125 grams.
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how many chlorine ions are required to bond with one aluminum ion
Answer:
Three chlorine ions
Explanation:
What is the relationship between changes in air pressure and wind speeds?
When a high- and a low-pressure air mass are close together, air moves slowly from high to low pressure.
When a high- and a low-pressure air mass are far apart, air moves slowly from high to low pressure.
When a high- and a low-pressure air mass are far apart, air moves quickly from high to low pressure.
When a high- and a low-pressure air mass are far apart, air moves quickly from low to high pressure.
( 13 point plz be right!)
Answer:
it's a i just took the test
YAY :D
Explanation:
Answer:
A
Explanation:
Took test got it right
Which anion testing solution produced the fewest (<3) precipitates? b) Salts of these anions may be described as soluble with few exceptions. Name the cations that are the exceptions to the rule for each anion identified in 3a
Answer:anions with least precipitates are anions of salt produce by a strong acid and strong base e.g KCL,Na2SO4,
Explanation: salts produce from strong acid such as HCL and a strong base such as KOH are extremely soluble and hence produce little or no precipitate when dissolved in water .meaning the salt are highly soluble , most group1 elements form salts that are highly soluble and hardly precipitates e.g Na(sodium) pottasium(K) ,lithium(Li)salts.they are called alkaline metals.
B) exception to the rules are hydrogen and Rubidium.hydrogen because it occurs basically as a gas and forms H^+ which tend to form a hydrogen bond while rubidium is a heavy metal forming insoluble salt
determine the empirical formula for a compound that has the following analysis: 8.09% carbon, 0.34% hydrogen, 10.78% oxygen, and 80.78% bromine.
Answer:
C₂HO₂Br₃
Explanation:
Data given
Carbon = 8.09%
Hydrogen = 0.34%
Oxygen = 10.78%
bromine = 80.78%
Empirical formula = ?
Solution:
First find the masses of each component
Consider total compound is 100g
As we now
mass of element = % of component
So,
8.09 g of C = 8.09% of Carbon
0.34 g og H = 0.34% of Hydrogen
10.78 g of O = 10.78% of Oxygen
80.78 g of bromine = 80.78% of bromine
Now convert the masses to moles
For Carbon
Molar mass of C = 12 g/mol
no. of mole = mass in g / molar mass
Put value in above formula
no. of mole = 8.09 g/ 12 g/mol
no. of mole = 0.674
mole of C = 0.6742
For Hydrogen
Molar mass of H = 1 g/mol
no. of mole = mass in g / molar mass
Put value in above formula
no. of mole = 0.34 g/ 1 g/mol
no. of mole = 0.34
mole of H = 0.34 mole
For Oxygen
Molar mass of O = 16 g/mol
no. of mole = mass in g / molar mass
Put value in above formula
no. of mole = 10.78 g/ 16 g/mol
no. of mole = 0.674
mole of O = 0.674 mole
For Br
Molar mass of Br = 80 g/mol
no. of mole = mass in g / molar mass
Put value in above formula
no. of mole = 80.78 g/ 80 g/mol
no. of mole = 1.0098
mole of Br = 1.0098 moles
Now we have values in moles as below
C = 0.6742
H = 0.34
O = 0.674
Br = 1.0098
Divide the all values on the smallest values to get whole number ratio
C = 0.6742 / 0.34 = 1.983 ≅ 2
H = 0.34 / 0.34 = 1
O = 0.674 /0.34 = 1.983 ≅ 2
Br = 1.0098 / 0.34 = 2.97 ≅ 3
So all have round value 1 mole
C = 2
H = 1
O = 2
Br = 3
So the empirical formula will be C₂HO₂Br₃ i.e. all 3 atoms in simplest small ratio
The empirical formula of the compound is CH₂OBr.
Explanation:The empirical formula can be determined by finding the ratio of the number of atoms of each element in the compound. To find the empirical formula, we first convert the percentages to grams. Using the given percentages, we can assume we have 100 grams of the compound. Hence, we have 8.09 grams of carbon, 0.34 grams of hydrogen, 10.78 grams of oxygen, and 80.78 grams of bromine.
Next, we convert the grams to moles by dividing each mass by the atomic weight of the respective element from the periodic table. The atomic weights are approximately 12.01 g/mol for carbon, 1.01 g/mol for hydrogen, 16.00 g/mol for oxygen, and 79.90 g/mol for bromine.
After finding the number of moles for each element, we divide each value by the smallest number of moles to get a simple whole number ratio. In this case, the smallest number of moles is 0.0816 moles, which corresponds to carbon. Hence, the ratio is approximately C₁H₀.₀₅ O₀.₂₇ Br₁, which simplifies to CH₂OBr.
Which container has gas stored at the highest temperature? 1 2 3 4
Answer: its 3
Explanation:
Answer:
3 has the highest temperature
Explanation:
Just took the test hope this helps. Leave a thanks please
help PLEASEEE TODAY
Answer:
it should be that I'm pretty sure it's Newton's law
Which of the following substances is a solution?
a) Acid rain
b) Table salt
c) Helium gas
d) Baking soda
Answer:
a) Acid rain
Explanation:
Because the rest are slolutes
Which number in a chemical formula tells you how many atoms of element you have
Answer:it doesn’t
Explanation:
Answer:
Subscript
Explanation:
Atoms in a chemical formula are represented by a subscript.
Which solution is more concentrated?
A. 2.00 moles of NaOH dissolved in 1.00 liter of solution
B. 2.00 grams of NaOH dissolved in 1.00 liter of solution
2 moles of NaOH dissolved in 1 litre of solution is the solution with more concentration.
Answer: Option A
Explanation:
Concentration of solution is the measure of the amount of solute dissolved in the solvent of the solution. So this is measured using the molarity of the solution. Molarity is determined as the number of moles of the solute present in the given amount of solvent.
[tex]\text {Molarity}=\frac{\text {Moles of solute}}{\text {Amount of solvent }}[/tex]
In this present case, the option A gives the molarity of 2 M as
[tex]\text {Molarity}=\frac{2}{1}=2 M[/tex]
But the second option, mass of NaOH is given. So we have to determine the molarity. First we have to find the molar mass of NaOH. We know that 1 mole of NaOH will contain 40 g/mole.
1 g of NaOH = 40 g of NaOH
1 g of NaOH = 1/40 moles
So 2 g of NaOH will contain [tex]\frac{2 g}{40 g/mole}[/tex] which is equal to 0.05 moles of NaOH.
Thus, the molarity of 2 g of NaOH will be
Molarity = [tex]\frac{0.05 moles }{1 L}[/tex]=0.05 M
Thus, the option A is having higher concentration as the molarity is more for 2 moles of NaOH dissolved in 1 l of solution.