1st Hr Atoms, Molecules, Elements and Compounds

The element oxygen, represented by the symbol O, is classified as

• a pure substance
• a compound
• a mixture
• a solution

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NGSS.MS-PS1-1

Hydrogen is a pure substance represented by the chemical symbol H. Which of the following best describes hydrogen?

• Hydrogen is an element made of two or more kinds of atoms.
• Hydrogen is a compound made of only one kind of atom.
• Hydrogen is a compound made of two or more kinds of atoms.
• Hydrogen is an element made of only one kind of atom.

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NGSS.MS-PS1-1

What is a compound?

• an atom with more electrons than protons
• a substance in which the atoms of two or more elements are combined together
• an atom with more neutrons than protons
• a substance in which the atoms of three or more elements are combined together

Tags

NGSS.MS-PS1-1

Atoms combine to form _______. 

• electrons
• molecules
• nuclei
• neutrons

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NGSS.MS-PS1-1

What do we call a substance consisting of a single atom?

• coefficient
• element
• compound
• molecule

What do we call a chemical substance made up of 2 or more different types atoms bonded together?

• formula
• atom
• subscript
• compound

Tags

NGSS.MS-PS1-1

All ____________ are made up of two or more atoms bonded together.

• atoms
• molecules
• electrons
• elements

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NGSS.MS-PS1-1

A recipe for a chemical substance is called a ________ _________.

• coefficent
• chemical formula
• Oxygen
• atom

H₂O₂← ?
This number tells the number of atoms present.

• coefficient
• molecule
• subscript
• atom

Tags

NGSS.MS-PS1-1

→2H₂O
This number tells how many molecules are in a chemical equation.

• coefficient
• subscript
• compound
• element

Tags

NGSS.MS-PS1-1