Matter: Elements, Compounds, Mixtures

When salt is dissolved in water, it becomes a _____________ mixture.

• element

• compound

• homogeneous

• heterogeneous

Mrs. Morgan is baking a cake (yay!). She pours flour and sugar into a bowl. The substance in the bowl is.....

• a compound

• a mixture

• an atom

• a proton

Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen?

• Hydrogen is an element made of two or more kinds of atoms.

• Hydrogen is a compound made of only one kind of atom.

• Hydrogen is a compound made of two or more kinds of atoms.

• Hydrogen is an element made of only one kind of atom.

Which of the following is an example of a heterogeneous mixture?

• apple juice

• vegetable soup

• Dr. Pepper

• Iron (Fe)

Which of the following substances is a compound?

• hydrogen sulfide gas (H₂S)

• solid bronze (an alloy of copper and tin)

• solid iron metal (Fe)

• a salt water solution

Tags

NGSS.MS-PS1-1

Carbon (C) and hydrogen (H) are pure substances. Each is made of only one type of atom, but carbon atoms are different from hydrogen atoms. Carbon and hydrogen chemically combine to form methane (CH₄).

• carbon, hydrogen, and methane are all elements.

• carbon and hydrogen are elements and methane is a compound.

• methane is an element and carbon and hydrogen are compounds.

Tags

NGSS.MS-PS1-1

True or False? Air is considered to be matter.

• true

• false

Tags

NGSS.MS-ESS2-5