Discover Chemistry

Question 1

What is the law of conservation of mass?

Accepted Answer

Mass cannot be created or destroyed.

Question 2

Which type of reaction involves the combination of two elements to form a compound?

Accepted Answer

Synthesis

Question 3

What is the chemical formula for water?

Accepted Answer

H2O

Question 4

Which scientist is credited with the discovery of the electron?

Accepted Answer

J.J. Thomson

Question 5

What is the process of a substance changing directly from a solid to a gas without becoming a liquid called?

Accepted Answer

Sublimation

Question 6

Which gas is the most abundant in Earth's atmosphere?

Accepted Answer

Nitrogen

Question 7

What is the chemical name for table salt?

Accepted Answer

Sodium chloride

Question 8

In the periodic table, elements in the same __________ have similar chemical properties.

Accepted Answer

Group

Question 9

Which gas is produced during photosynthesis?

Accepted Answer

Oxygen

Question 10

Which subatomic particle carries a negative charge?

Accepted Answer

Electron

Question 11

How many electrons are in the outer shell of a carbon atom?

Accepted Answer

4

Question 12

What is the chemical symbol for gold?

Accepted Answer

Au

Question 13

What is the unit of measurement for energy in the metric system?

Accepted Answer

Joules

Question 14

What is the pH level of a neutral substance?

Accepted Answer

7

Questions 14