Intro to Chem Part 2

The formation of an ionic bond involves the

• transfer of electrons.

• sharing of neutrons.

• transfer of neutrons.

• sharing of protons.

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NGSS.HS-PS1-1

NGSS.HS-PS1-2

Sodium (Na) and chlorine (Cl) combine to form sodium chloride (NaCl), which is commonly known as

• soap.

• vinegar.

• table salt.

• baking soda.

The atoms that make up oxygen gas

• share two covalent bonds.

• have a definite shape.

• share a pair of neutrons

• have two free electrons.

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NGSS.MS-PS1-1

Which statement below correctly describes water?

• Water is a an ionic crystalline compound

• The atoms in a water molecule are bonded covalently.

• A sample of water has a definite volume and a definite shape.

• A water molecule consists of two atoms of hydrogen and two atoms of oxygen.

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Rust is a compound with the formula Fe₂O₃ Which elements combine to form rust?

• iron and water

• iron and oxygen

• iron and air

• iron and acid

Calcium carbonate (CaCO₃) is considered a compound because it is made up of two or more

• molecules

• elements.

• gases.

• solids.

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NGSS.MS-PS1-1

When potassium and bromine atoms form chemical bonds, which of these is produced?

• an element

• a mixture

• a compound

• a new form of matter

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NGSS.MS-PS1-1

Which of these are broken down during chemical, but not physical, changes?

• elements

• mixtures

• solutions

• compounds

A student studies the following four chemicals in a laboratory investigation. Which chemical cannot be further broken down into other chemicals using ordinary laboratory processes?

• 1

• 2

• 3

• 4

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NGSS.MS-PS1-5

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.