CET: Chemistry

Front

What is a chemical reaction?

Back

A process that involves the transformation of one or more substances into different substances, characterized by the breaking and forming of chemical bonds.

Front

Which of the following is NOT a chemical reaction? A. freezing carbon dioxide B. rusting of metal C. ripening of fruit D. burning paper

Back

A. freezing carbon dioxide

Front

What is the formula to calculate the volume of a gas at different temperatures?

Back

V1/T1 = V2/T2, where V is volume and T is temperature in Kelvin.

Front

If a gas measures 450 mL at 30°C, what will be its volume at 50°C?

Back

(450 mL x 323 K)/303 K

Front

What does a pH level of 6.5 indicate about a solution?

Back

The solution is acidic.

Front

What is the balanced equation for the reaction of nitrogen gas with hydrogen gas to produce ammonia?

Back

N2 + 3H2 → 2NH3

Front

How many grams of NH3 will be produced from 7.5 mol of H2 in the reaction N2 + 3H2 → 2NH3?

Back

85 g

Front

What are isotopes?

Back

Atoms of the same element that have the same atomic number but different mass numbers due to differing numbers of neutrons.

Front

What is the atomic mass of nitrogen (N)?

Back

14 g/mol.

Front

What is the atomic mass of hydrogen (H)?

Back

1 g/mol.