Matter & Its Interactions PS.8.1

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 compoud, because the cloudy liquid was separated by evaporation

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

Wendy draws a model to represent a neutral beryllium (Be) atom. Her model has 4 neutrons and 4 protons in the nucleus. It also has 5 electrons in orbits around the nucleus. Wendy's teacher says there is an error in her model. What is the error?

• The model has too many protons.

• The model has too many electrons.

• The 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?

• Both are nonreactive gases at room temperature.

• Both are nonreactive liquids at room temperature.

• Both ar 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

NGSS.MS-PS3-4

NGSS.MS-PS3-5

Terry is learning about chemical reactions in science class. Terry's teacher draws an equation on the chalkboard and explains that the equation demonstrates the law of conservation of mass. What evidence supports this claim?

• The same chemicals appear in both the reactants and the products.

• The equation shows that the reaction produced a new substance.

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

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

Tags

NGSS.MS-PS1-5

This element is a solid at room temperature and is very reactive.

• flourine (F)

• argon (Ar)

• lithium (Li)

• hydrogen (H)

This element is a gas at room tempearture and is not reactive.

• flourine (F)

• argon (Ar)

• lithium (Li)

• mercury (Hg)

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

This element is a gas at room temperature and is very reactive.

• flourine (F)

• argon (Ar)

• lithium (Li)

• mercury (Hg)

Tags

NGSS.MS-PS1-4

Methane is a pure substance and exists as a gas at room temperature. Each methan 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 mixgture

• 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 the periodic table