Chemistry Review

Which is a compound?

• Nitrogen (N₂)

• Neon (Ne)

• Ozone (O₃)

• Ammonia (NH₃)

Tags

NGSS.MS-PS1-1

Scientists can identify an element by looking at the structure of a single

• atom.

• neutron.

• molecule.

• electron.

Tags

NGSS.MS-PS1-1

How many atoms of oxygen are in a molecule of glucose, C₆H₁₂O₆?

• 1

• 6

• 12

• 24

Tags

NGSS.MS-PS1-1

Read the equation.                $2Ca\ +\ O_2\rightarrow\ 2CaO$                     What is the product of the reaction?

• metal

• mixture

• solution

• compound

Tags

NGSS.MS-PS1-2

Which of these is an element?

• KBr

• O₂

• 2KCl

• FeO₂

Tags

NGSS.MS-PS1-1

The compound potassium sulfate, K₂SO₄ , is composed of

• 2 atoms of potassium, 1 atom of sulfur, and 4 atoms of oxygen.

• 2 atoms of potassium, 4 atoms of sulfur, and 4 atoms of oxygen.

• two molecules of potassium and one molecule of sulfate.

• one molecule of potassium and two molecules of sulfate.

Tags

NGSS.MS-PS1-1

A researcher uses several procedures to separate a rock sample into different chemicals. A mass of 50 grams of one chemical is produced. If this chemical cannot be separated into other chemicals, then it is BEST described as

• a compound.

• a mixture.

• a solution.

• an element.

Tags

NGSS.MS-PS1-1

Where are the most reactive nonmetals located on the periodic table?

• the uppermost complete row of the table

• the rows at the bottom of the table connecting two sections

• the column at the far left side of the table

• the second column from the right side of the table

What physical property is characteristic of all of the elements in the group located in the rightmost column of the periodic table?

• very high melting point

• gas state at room temperature

• good conductor of electric current

• extremely brittle solid at room temperature

Which characteristic of an element determines its placement in the periodic table?

• mass

• size

• number of neutrons

• number of protons