Earth Science Module 2 Common Assessment

Which atomic particles are located in an atom’s nucleus?

• electrons and protons

• electrons and neutrons

• electrons, protons and neutrons

• protons and neutrons

Tags

NGSS.MS-PS1-1

What is the atomic number of this atom?

• 3

• 4

• 6

• 5

Tags

NGSS.MS-PS1-1

How many valence electrons does this atom have?

• 1

• 2

• 3

• 4

Tags

NGSS.MS-PS1-1

Which element does this atom represent? (Refer to the periodic table of the elements.)

• helium

• beryllium

• nitrogen

• lithium

Tags

NGSS.MS-PS1-1

An atom gains two electrons. What is its charge?

• +1

• -2

• +2

• -1

What type of bond is formed when two atoms share a pair of electrons?

• covalent

• ionic

• metallic

• compound

Tags

NGSS.MS-PS1-1

What is true about chemical reactions?

• There must be more than three chemical elements present.

• The number of chemical elements must be an even number

• The number of atoms on each side of the equation much be equal.

• At least one of the atoms must be oxygen.

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

Which is an example of a heterogeneous mixture?

• coffee

• soil

• air

• gelatin

Many musical instruments are made of brass, which is a mixture of copper and zinc atoms. What is brass an example of?

• solid solution

• ionic compound

• chemical reaction

• base

Tags

NGSS.MS-PS1-1

An unknown substance has more OH- ions than tears but less OH- ions than ammonia. What is its approximate pH

• 3

• 5

• 9

• 12

Tags

NGSS.MS-PS1-2