Mixture and Compounds

The air we breathe contains different individual gases (mostly nitrogen and oxygen). Which of the following correctly describes the air we breathe?

• Mixture

• Compound

• Element

• Liquid

The _______ of a substance is the amount of that substance that can dissolve in a certain amount of a given solvent.

• chemical reactivity

• boiling point

• solubility

• density

Brass alloy is best described as _______.

• a pure substance

• a mixture

• a compound

• an element

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

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

• 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 two or more kinds of atoms.

Tags

NGSS.MS-PS1-1

Mr. McPhillip has a ribbon of magnesium (Mg), a silvery metal. As a demonstration for his class, he sets the metal on fire. It burns brightly, leaving behind a whitish powder.

The magnesium is a compound,

an element,

and the powder produced by burning it is

• Element,compound

• Compound, Element

Tags

NGSS.MS-PS1-1

Look at the graph above showing the composition of air. Which component is the solvent?

• Oxygen

• None of them are solvents

• Nitrogen

• Other Gasses

Which of the following is true about mixtures and compounds?

• A mixture contains different substances that are not chemically combined with one another.

• A compound forms when different substances chemically combine to form a new substance.

• Mixtures and compounds are both made of two or more different substances.

• All of these

Vince is baking a cake. He pours flour and sugar into an empty bowl. The substance in the bowl is a(n) __________.

• atom

• mixture

• compound

• element

A solution of baking soda has a pH of 9. Baking soda _______.

• could be either acid or a base

• is an acid

• is a base

• is a neutral substance

Holly has an unknown substance in a beaker. She wants to determine the relative pH of the unknown substance. She places a piece of blue litmus paper into the substance, and the litmus paper stays blue.

The substance in the beaker

• is a base

• has a neutral ph

• does not have a ph

• is an acid