CHEMISTRY HIGH SCHOOL

A common stain remover is sold in concentrated form as 3M sodium hypochlorite (NaOCl). You need to create 400 milliliters of a 0.5M solution of sodium hypochlorite to fill a spray bottle. What volume of 3M sodium hypochlorite is needed?15.0 mL

66.7 mL

133 mL

167 mL

Answers

Answer 1
Answer:

To solve this we use the equation, 

M1V1 = M2V2

where M1 is the concentration of the stocksolution, V1 is the volume of the stock solution, M2 is the concentration ofthe new solution and V2 is its volume.

3 M x V1 = 0.50 M x .400 L

V1 = 0.07 L or 66.67 mL of the 3M sodium hypochlorite solution


The correct answer is the second option given.
Answer 2
Answer:

Answer:

V2 = 66.67mL

Explanation:

Hello! To calculate this we have to take into account the equation that relates two substances:

M1 * V1 = M2 * V2

We have the concentration and volume of a substance and the concentration of the second. We have to find out the volume.

M1 = 0.5M  

V1 = 400mL

M2 = 3M  

V2 = (M1 * V1) / M2

V2 = (0.5M * 400mL) / 3M

V2 = 66.67mL

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What is the volume of 70.0 g of ether if density os 0.70 g/mL

Answers

D = m / V

0.70 g/mL = (70.0g)/(V)

V = (m)/(D)

V = (70.0g)/(0.70g/mL)

V = 100 mL

hope this helps!

What is the half life of a radioisotope if 25.0 grams of anoriginal 200.-gram sample of the isotope remainsunchanged after 11.46 days?3) 11.46 d1) 2.87 d4) 34.38 d2) 3.82 d

Answers

Half-life is the amount of time, in days or years( most common) a certain substance disintegrate half of it's content.
We are given the initial (Ao) and final (A) amount of the substance. The time passed (T) is also given and we are asked to find the half-life (t). We use the equation below:

A=Aoe^(-ln2/t)T
25=200e^(-ln2/t)(11.46)
Solve for t
Answer: 3.82 days

Classify each of the following statements as an experiment, a hypothesis, a scientific law, an observation, or a theory. For example, Joseph Gay-Lussac reacted hydrogen and oxygen to produce water vapor, and he reacted nitrogen and oxygen to form either dinitrogen oxide (N2O) or nitrogen monoxide (NO). Gay-Lussac found that hydrogen and oxygen react in a 2:1 volume ratio and that nitrogen and oxygen can react in 2:1 or 1:1 volume ratios depending on the product. In 1808, Gay-Lussac published a paper in which he stated that the relative volumes of gases in a chemical reaction are present in the ratio of small integers provided that all gases are measured at the same temperature and pressure. In 1811, Amedeo Avogadro proposed that equal volumes of all gases measured at the same temperature and pressure contain the same number of molecules. By midcentury, Rudolf Clausius, James Clerk Maxwell, and others had developed a detailed rationalization of the behavior of gases in terms of molecular motions

Answers

Answer:

Classify each of the following statements as an experiment, a hypothesis, a scientific law, an observation, or a theory.

(1) For example, Joseph Gay-Lussac reacted hydrogen and oxygen to produce water vapor, and he reacted nitrogen and oxygen to form either dinitrogen oxide (N2O) or nitrogen monoxide (NO). Gay-Lussac found that hydrogen and oxygen react in a 2:1 volume ratio and that nitrogen and oxygen can react in 2:1 or 1:1 volume ratios depending on the product.

(2) In 1808, Gay-Lussac published a paper in which he stated that the relative volumes of gases in a chemical reaction are present in the ratio of small integers provided that all gases are measured at the same temperature and pressure.

(3) In 1811, Amedeo Avogadro proposed that equal volumes of all gases measured at the same temperature and pressure contain the same number of molecules.

(4) By midcentury, Rudolf Clausius, James Clerk Maxwell, and others had developed a detailed rationalization of the behavior of gases in terms of molecular motions

The correct answers to the question are as follows

(1) An experiment

(2) A scientific law

(3) A hypothesis

(4) A theory

Explanation:

(1)  An experiment

A scientific experiment involves the development of procedures to verify an hypothesis

(2) A scientific law

A scientific law is a description or general rule to explain an observed phenomenon using a mathematical or verbal statement without attempting to provide an explanation

(3) A hypothesis

An hypothesis is an explanation of an observed phenomenon which can then be tested through the performance of experiments

(4) A theory

A theory in science is an explanation of naturally occurring phenomenon backed up by the results of experiments and observation

Final answer:

The given statements have been classified as experiment (1), observation (2), scientific law statement (3), hypothesis (4), and theory (5) respectively in the context of Chemistry.

Explanation:

1. Joseph Gay-Lussac reacted hydrogen and oxygen to produce water vapor, and he reacted nitrogen and oxygen to form either dinitrogen oxide or nitrogen monoxide: This is an experiment.

2. Gay-Lussac found that hydrogen and oxygen react in a 2:1 volume ratio and that nitrogen and oxygen can react in 2:1 or 1:1 volume ratios depending on the product: This is an observation.

3. In 1808, Gay-Lussac published a paper in which he stated that the relative volumes of gases in a chemical reaction are present in the ratio of small integers provided that all gases are measured at the same temperature and pressure: This is a statement of a scientific law.

4. In 1811, Amedeo Avogadro proposed that equal volumes of all gases measured at the same temperature and pressure contain the same number of molecules: This is a hypothesis.

5. By midcentury, Rudolf Clausius, James Clerk Maxwell, and others had developed a detailed rationalization of the behavior of gases in terms of molecular motions: This is a theory.

Learn more about Scientific Statements Classification here:

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In general, if the temperature of a chemical reaction is increased, the reaction ratea. increases.
b. decreases.
c. remains the same.
d. cannot be predicted.

Answers

In general, if the temperature of a chemical reaction is increased, the reaction rate increases as well. The correct answer is A.

Please help me in this.
i'll seriously mark you brainly.
please help.

Answers

Answer:

First box: 3

Second box: 4

Third box: 3

Fourth box: 4

Explanation:

I tried out various numbers, but got 3 and 4 because:

3PbI4 + 4CrCl3 -----> 3PbCl4 + 4CrI3

Each term cancels put.

3Pb --> 3Pb

4Cr --> 4Cr

and so forth...

Hope this helps!

A solution has a volume of 250 ml and contains 0.70 mol Nacl what is the molarity

Answers

first convert mL into liters:

1 L = 1000 mL

250 mL / 1000 = 0.25 L

M = n / V

M = 0.70 / 0.25

M = 2.8 mol/L⁻¹

hope this helps!

The correct answer is D, 2.8 M.
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