7.6ABC Test Review

Which chemical is a compound?

• helium (He)

• hydrochloric acid (HCl)

• hydrogen (H2)

• nitrogen (N2)

Tags

NGSS.MS-PS1-1

Which of the following is best classified as a compound?

• Helium (He), because it contains only one type of atom

• Oxygen (O2), because it contains two of the same type of atoms

• Carbon dioxide (CO2), because it contains two different types of atoms

• Manganese (Mn), because it contains a metal and a nonmetal

Tags

NGSS.MS-PS1-1

When electricity passes through water, hydrogen and oxygen are produced. Which table correctly labels the compounds and elements involved in the process?

• Water–Compound, Hydrogen–Compound, Oxygen–Element

• Water–Compound, Hydrogen–Element, Oxygen–Compound

• Water–Compound, Hydrogen–Element, Oxygen–Element

• Water–Element, Hydrogen–Element, Oxygen–Compound

Tags

NGSS.MS-PS1-1

How are carbohydrates and oxygen classified? (Carbohydrates are made of oxygen, hydrogen and carbon atoms bonded together.)

• Carbohydrate is a compound. Oxygen is an element.

• Carbohydrate is a compound. Oxygen is a mixture.

• Carbohydrate is an element. Oxygen is an element.

• Carbohydrate is an element. Oxygen is a mixture.

Tags

NGSS.MS-PS1-1

Which pure substance is composed of more than one element?

• carbon

• gold

• water

• sodium

Tags

NGSS.MS-PS1-1

Which two substances are elements?

• sand and air

• salt and sand

• iron and helium

• helium and water

Which of these diagrams most likely represents the chemical structure of a substance that is a pure element?

• [Diagram a]

• [Diagram b]

• [Diagram c]

• [Diagram d]

Tags

NGSS.MS-PS1-1

Which molecule represents an element?

• bromine gas (Br2)

• carbon dioxide (CO2)

• hydrogen fluoride (HF)

• sodium chloride (NaCl)

Which of the following is not an element?

• Helium

• Nitrogen

• Water

• Sodium

Tags

NGSS.MS-PS1-1

Refer to the Venn diagram and the list of characteristics below: Which of the following would be found only in the Elements side of the Venn diagram above?

• VI

• I, V

• II, IV

• IV