7th Grade- Chapter 1 Review

How many atoms are in the particle?

• 1

• 2

• 3

• 5

Tags

NGSS.MS-PS1-1

Which kind of matter might contain only this type of particle?

• a compound

• an element

• a heterogeneous mixture

• a homogeneous mixture

Tags

NGSS.MS-PS1-1

Which class of matter is the least evenly mixed?

• compounds

• heterogeneous mixtures

• homogeneous mixtures

• solutions

Which correctly describes a compound but not a mixture?

• All the atoms are of the same element.

• All the molecules have at least two atoms.

• The combination of substances never changes.

• The substances can be separated without breaking bonds.

A girl pours a spoonful of sugar into a glass of warm water. She stirs the water until the sugar disappears. When she tastes the water, she notices that it is now sweet. Which describes the kind of matter in the glass?

• a compound

• an element

• a solution

• a substance

Tags

NGSS.MS-PS1-2

How could you separate a mixture of stone and wooden beads that are all the same size?

• Add water to the mixture and skim off the wooden beads, which float.

• Heat the mixture until the stone beads melt.

• Strain the mixture to separate out the stone beads.

• Use a magnet to pull out the wooden beads.

The figure shows models of three different atoms. What can you conclude about the three models shown in the figure?

• They all show positive ions.

• They all show negative ions.

• They all show the same element.

• They all show the same isotope.

Tags

NGSS.MS-PS1-1

What is the atomic number of an atom that has 2 electrons, 3 protons, and 4 neutrons?

• 2

• 3

• 4

• 7

Tags

NGSS.MS-PS1-1

The table shows the numbers of protons, neutrons, and electrons for four atoms. Which atom has a negative charge?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1

Which of the atoms is a different element than the others?

• A

• B

• C

• D

Tags

NGSS.MS-PS1-1