Category 1 Review

Which of the following elements is the most reactive from this row?

• Aluminum

• Sulfur

• Cholrine

• Argon

Which of the following is an example of a physical change?

• Rust forming on a nail left outside

• Your body digesting food

• Hydrogen peroxide forming bubbles when place on an open wound

• A juice box freezing when placed in the freezer

Tags

NGSS.MS-PS1-4

NGSS.MS-PS3-4

When calcium carbonate, CaCO_3, is heated, it makes two products: carbon dioxide, CO₂, and calcium oxide, CaO. The chemical reaction is shown.

If the reaction starts with 10g of calcium carbonate and 5.6g of calcium oxide are produced, in grams, what is the total mass of the carbon dioxide that was produced by this chemical reaction?

• 2.4 g

• 4.4 g

• 5.2 g

• 10 g

Tags

NGSS.MS-PS1-2

NGSS.MS-PS1-5

NiCl is a type of yellow salt which can damage the lungs and nasal passage if inhaled. How many total atoms are found in one molecule of NiCl ?

• 1

• 2

• 4

• 3

Tags

NGSS.MS-PS1-1

Jesse has cereal for breakfast every morning before going to school. One day, he forgets

to put the milk gallon back in the refrigerator. When he returns from school he notices

the milk gallon sitting on the kitchen counter. When he opens the bottle he smells a foul

odor and has realized the milk has soured. Milk souring is an example of which of the

following?

• physical change

• chemical change

• physical property

• chemical property

Tags

NGSS.MS-PS1-2

Baking soda, also called sodium bicarbonate, is a common household item found in many

kitchen pantries. The molecular formula for baking soda is NaHCO₃ . How many atoms of sodium are in one

molecule of baking soda?

• 0

• 1

• 4

• 6

Tags

NGSS.MS-PS1-1

The structure of an atom is shown. Taking all the subatomic particles into account, what is the overall charge of this atom?

• postive

• negative

• neutral

• you cannot tell from the information provided in the diagram

Tags

NGSS.MS-PS1-1

The number of protons and neutrons of three unknown elements X, Y, and Z are shown

in the data table below. What is the atomic mass of the Element Z ?

• 16

• 1

• 9

• 13

Tags

NGSS.MS-PS1-1

On the Periodic Table of Elements, why is group 1A more reactive than group 2A?

• The outer energy level of group 1A only has one electron.

• The outer energy level of group 1A is full.

• The outer energy level of group 1A is empty.

• There are too many valence electrons in group 1A.

What atoms are present in one molecule of calcium carbonate, CaCO₃ ?

• One calcium atom, one carbon atom, and two oxygen atoms

• Two calcium atoms, two carbon atoms, and three hydrogen atoms

• One calcium atom, one carbon atom, and three oxygen atoms

• One calcium atom and three carbon atoms.

Tags

NGSS.MS-PS1-1