Which of the following is a compound?

• NaCl

• O2

• Fe

• Ne

Tags

NGSS.MS-PS1-1

True or False: All compounds are made up of elements.

• True

• False

Tags

NGSS.MS-PS1-1

If 7 g of nitrogen reacts with 16 g of oxygen to form nitrogen dioxide (NO2), what is the total mass of the nitrogen dioxide produced?

• A. 23 g

• B. 9 g

• C. 7 g

• D. 16 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

In a chemical reaction, if the mass of the reactants is 75 g, what must be the mass of the products?

• Less than 75 g

• Exactly 75 g

• More than 75 g

Tags

NGSS.MS-PS1-5

A compound has a total mass of 180 g, with 54 g of aluminum. What is the % by mass of aluminum in this compound?

• 50%

• 30%

• 25%

• 20%

If a compound is made up of 12 g of magnesium and 19 g of fluorine, what is the total mass of the compound?

• 7 g

• 19 g

• 12 g

• 31 g

Tags

NGSS.MS-PS1-5

If an element has an atomic number of 12 and an atomic mass of 24, how many protons does it have?

• A. 24

• B. 12

• C. 36

• D. 6

Tags

NGSS.MS-PS1-1

In methane (CH₄), what is the ratio of carbon atoms to hydrogen atoms?

• A. 1:4

• B. 4:1

• C. 2:3

• D. 1:1

Tags

NGSS.MS-PS1-1

An element consists of only one type of atom, while a compound is made up of atoms of two or more elements chemically bonded. True or False?

• True

• False

In a chemical reaction, 12 g of carbon reacts with 32 g of oxygen to produce 44 g of carbon dioxide. Does this observation support the law of conservation of mass?

• Yes

• No

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5