CHEMISTRY HIGH SCHOOL

Which of the following is NOT a clue that a chemical change has occurred?a. change in color
b. production of a gas
c. formation of a precipitate
d. change in shape

Answers

Answer 1
Answer: change in shape is the answer because all chemical reactions only affect the chemical composition of the substance

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26.0 g of a liquid that has a density of 1.44 g/mL needs to be measured out in a graduated cylinder. what volume should be used

Answers

Answer: The volume of liquid used will be 18.055 mL.

Explanation:

To calculate the volume of liquid, we use the equation for density which is:

\text{Density}=\frac{\text{Mass}}{\text{Volume}}

We are given:

Mass of the liquid = 26 g

Density of the liquid = 1.44 g/mL

Volume of the liquid = ? mL

Putting values in above equation, we get:

1.44g/mL=\frac{26g}{\text{Volume of the liquid}}\n\n\text{Volume of the liquid}=18.055mL

Hence, the volume of liquid used will be 18.055 mL.
As Density = Mass/Volume
Mass = 26.0g 
Density = 1.44g/mL
Therefore Volume = Mass/Density
=> Volume = 26.0/1.44 = 18.055... = 18.1mL (to 3 sig figs)

What is a Benedict solution?

Answers

Benedict's solution, deep-blue alkaline solution used to test for the presence of the aldehyde functional group, - CHO. The substance to be tested is heated with Benedict's solution; formation of a brick-red precipitate indicates presence of the aldehyde group. Since simple sugars (e.g., glucose) give a positive test, the solution is used to test for the presence of glucose in urine, a symptom of diabetes. One liter of Benedict's solution contains 173 grams sodium citrate, 100 grams sodium carbonate, and 17.3 grams cupric sulfate pentahydrate. It reacts chemically like Fehling's solution; the cupric ion (complexed with citrate ions) is reduced to cuprous ion by the aldehyde group (which is oxidized), and precipitates as cuprous oxide, Cu2O

What volume of a 2.5 M stock solution of acetic acid (HC2H3O2) is required to prepare 100.0 milliliters of a 0.50 M acetic acid solution?

Answers

Mi * Vi = Mf * Vf

2.5 * Vi = 0.50 * 100.0

2.5 Vi = 50

Vi = 50 / 2.5

Vi = 20 mL

hope this helps!

Answer:

20 milliliters

Explanation:

I don't cap

A scientists claimed that he had cloned a guinea pig to produce two offspring, a male and a female. The claim is not valid because

Answers

This claim is not valid because the two offspring are not identical copies of the original guinea pig, especially given that the scientist has created both sexes out of just one. 

What are the 5 areas of chemistry

Answers

The 5 main branches of chemistry are physics, analytical, biochemistry, organic chemistry, and inorganic chemistry.

The molar mass of NH3 is 17.03 g/mol. The molar mass of H2 is 2.0158 g/mol. In a particular reaction, 0.575 g of NH3 forms. What is the mass, in grams, of H2 that must have reacted, to the correct number of significant figures?

Answers

The balanced chemical reaction is:

N2 + 3H2 = 2NH3

 

We are given the amount of ammonia formed from the reaction. This is where we start our calculations.

 

0.575 g NH3 (1 mol NH3 / 17.03 g NH3) (3 mol H2 / 2 mol NH3) ( 2.02 g H2 / 1 mol H2) = 0.10 g H2

Answer:

Answer is 0.102.    

Explanation:
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