3/28 Chemical Reactions Quiz Review

How many electrons are in a neutral atom of aluminum?

• 13

• 14

• 26

• 27

Tags

NGSS.MS-PS1-1

How many valence electrons are there in this image?

• 12

• 10

• 7

• 2

Tags

NGSS.MS-PS1-1

Krupa decided to cook fresh Margherita pizza for dinner. As the pizza baked, Krupa noticed the following.

• The cheese melted.

• The crust turned golden brown.

• Bubbles formed in the crust.

• The smell of baking pizza filled the kitchen.

Which signs of a chemical reaction were present in the baking pizza?

• odor

• melting

• gas production

• color change

Tags

NGSS.MS-PS1-2

Which of the following is a covalent compound? (Remember, the bond contains TWO nonmetals)

• lithium oxide, Li₂O

• magnesium bromide, MgBr₂

• carbon dioxide, CO₂

• sodium chloride, NaCl

Tags

NGSS.MS-PS1-1

Malachi conducted a chemical reaction in which calcium carbonate decomposed into calcium oxide and carbon dioxide. During the reaction, the temperature inside the beaker decreased by 5°C. Remember the prefix "En-" and what it relates to

Which term best describes the reaction?

• polar

• nonpolar

• endothermic

• exothermic

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

How many atoms of each element are in the compound: Ca₃(PO₄)₂?

• 3

• P

• 8

• O

• 2

• Ca

Tags

NGSS.MS-PS1-1

How many valence electrons are in a Chlorine atom?

• 6

• 7

• 4

• 8

Tags

NGSS.MS-PS1-1

Jose is studying a compound supplied by his chemistry teacher. The substance has a crystal structure, is brittle, and has a high melting point. It is a salt by nature. What type of compound is Jose examining?

• 
  ionic

• polar molecule

• covalent

• nonpolar molecule

Tags

NGSS.HS-PS1-3

Match each word to its synonym.

• the atoms cooperate and share electrons

• ionic

• molecule

• ionic compound

• salt

• covalent compound

• electrons are transferred (give or take)

• "co-valent"

Which of the statements best describes a polar bond?

• An electron disappears and is converted to energy.

• An electron transfers from one atom to another.

• Two atoms share an electron equally.

• Two atoms share an electron unequally.