Physical Science Released

A student pours a cloudy liquid through a thin piece of paper and into a beaker. The student observes the collected liquid is not cloudy. How should the student classify the original cloudy liquid?

• as a mixture, because the cloudy liquid was separated by evaporation

• as a mixture, because the cloudy liquid was separated by filtration

• as a compound, because the cloudy liquid was separated by evaporation

• as a compound, because the cloudy liquid was separated by filtration

Tags

NGSS.MS-PS1-2

Wendy draws this model to represent a neutral beryllium (Be) atom. Wendy’s teacher says there is an error in her model. What is the error? Mark only one oval.

• The model has too many protons.

• The model has too many electrons.

• The model shows protons in the wrong location.

• The model shows electrons in the wrong location.

Tags

NGSS.MS-PS1-1

How are the properties of helium (He) and krypton (Kr) similar? Mark only one oval.

• Both are nonreactive gases at room temperature.

• Both are nonreactive liquids at room temperature.

• Both are reactive gases at room temperature.

• Both are reactive liquids at room temperature.

A scientist experiments on a piece of solid copper.

 The scientist heats the copper piece and observes the copper’s density decreases as its temperature increases.
 The scientist continues to heat the copper until it melts.

How are the decrease in density and the melting similar?

• They are both physical changes, because the composition of the copper piece remains the same.

• They are both chemical changes, because the composition of the copper piece remains the same.

• They are both physical changes, because the new substance has different chemical properties than copper.

• They are both chemical changes, because the new substance has different chemical properties than copper.

Tags

NGSS.MS-PS1-4

Terry is learning about chemical reactions in science class. Terry’s teacher draws this equation on the chalkboard, and explains that the equation uses a triangle, a circle, and a square as symbols to represent elements. Each symbol represents a different element. Terry claims the equation demonstrates the law of conservation of mass. What evidence supports Terry’s claim?

• The same symbols appear in the reactants and products.

• The equation shows this reaction produced new substances.

• There are equal numbers of each symbol in the reactants and products.

• The arrangement of the symbols in the reactants is the same as their arrangement in the products.

Tags

NGSS.MS-PS1-5

Which is a property of lithium?

• solid, very reactive

• gas, reactive

• gas, nonreactive

Which is a property of argon?

• solid, very reactive

• gas, reactive

• gas, nonreactive

Which is a property of fluorine?

• solid, very reactive

• gas, reactive

• gas, nonreactive

Methane is a pure substance and exists as a gas at room temperature. Each methane molecule is made up of one carbon atom chemically bonded to four hydrogen atoms. How is methane classified?

• as an element

• as a compound

• as a homogeneous mixture

• as a heterogeneous mixture

Tags

NGSS.MS-PS1-1

An unidentified pure solid is composed of an element. The substance is metallic and reacts vigorously when placed in water. Where is this element most likely found on the periodic table?

• at the top of the periodic table

• at the bottom of the periodic table

• on the left side of the periodic table

• on the right side of the periodic table