quiz 2-1 thursday

atomic number is

• the number of protons

• the number of electrons

• the number of neutrons

• the location of an atom on the periodic table

Atomic Mass is the number of

• protons and neutrons in the nucleus of an atom

• protons and electrons in the nucleus of an atom

• neutrons and electrons in the nucleus of an atom

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NGSS.MS-PS1-1

Conservation of mass means

• all the atoms present before a chemical reaction are not present after

• atoms present before chemical reactions are present after

• new substances and new elements are formed in a chemical reaction

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NGSS.MS-PS1-5

An elements is

• a substance that cannot be split into simpler substances

• a substance that can be split into simpler substances

A molecule is

• a singular particle of a particular element

• another name for an element

• 2 or more atoms that are combined

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NGSS.MS-PS1-1

which of the statements on physical changes are correct

• A physical change cannot be reversed

• A physical change is a change in state

• A physical change is a change in form

• A physical change is where new substances are formed

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NGSS.MS-PS1-4

Water is the product of the reactants:

• oxygen and water

• oxygen and carbon

• hydrogen and oxygen

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NGSS.MS-PS1-5

In a chemical reaction, reactants contact each other, bonds between atoms in the reactants

are broken, and

• atoms rearrange and form new bonds to make the products.

• atoms remain the same and do not form new bonds to make the proudcts

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NGSS.MS-PS1-5

NGSS.MS-PS1-2

The type of reaction that releases energy as heat is called

• endothermic

• exothermic

• respiration

• photosynthesis

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NGSS.HS-PS1-4

What does c represent?

• Proton

• Neutron

• Electron

Tags

NGSS.MS-PS1-1