Ramp Up Chemistry

Questions that I had trouble with and could study to become better

Which of the following illustrates the law of multiple proportions?

The mass ratio of O to N in NO₂ is twice that in NO.

How many significant figures at the end of this equation?

(3.05 + 2.1) * (3.05 - 0.001)

2

A regulation American football field is 100. yards long. How many centimeters is this? 1 yard is exactly equal to 3 feet. 1 foot is exactly equal to 12 inches. 1 inch is exactly equal to 2.54 cm. Give your answer to the correct number of significant figures.

9,140

From the list below, select the appropriate SI unit.

1.001 x 10^-7 GL is equal to 1.001 × 10⁵ _____?

mL

Express the result of the following calculation to the appropriate number of significant figures:

(0.321)*(0.0538)*(273+27.1)/(8.401)

0.615

If the temperature of a gas is reduced drastically, which physical process would be likely to occur? 

condensation

Which of the following is an example of an extensive chemical property? 

19 g of fluorine gas will react with 1 g of hydrogen gas to form HF.

When 2610 + 11.7 + 0.22 are added, the answer to the correct number of decimal places is…

2620

What is the charge on the manganese ion in MnS₂ and how would you name this compound? 

+4  ;  Manganese (IV) sulfide

Which of the following molecules contain only non-polar covalent bonds?

C₂H₂