NGSS.MS-PS1-1

How many Hydrogen (H) atoms are in NH₃O5

• 3
• 4
• 5
• 1

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Near the outside of an atom, you'd find _____

• electrons
• protons
• neutrons
• photons

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When 2 or more elements combine a/an __________ is formed.

• atom
• compound

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A pure substance...

• is an element or a compound
• is an element or a mixture
• is a compound or a mixture
• is a mixture

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The atomic number is equal to _.

• the number of protons and electrons
• the number of neutrons only
• the total number of protons and neutrons
• the number of protons neutrons and electrons

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What is made up two or more elements that are chemically combined?

• Atom

• Element

• Compound

• Mixture

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How is carbon dioxide (CO₂) formed?

• The carbon atom shares 2 electrons with each oxygen atom. Both of the oxygen atoms share 2 electrons back with oxygen.

• The carbon atom gives each oxygen atom 2 electrons.

• One of the oxygen atoms gives the carbon atom 4 electrons.

• Both of the oxygen atoms share 6 electrons with the carbon atom.

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How many Nitrogen (N) atoms are in 4NH₃?

• 4

• 1

• 3

• 12

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This is what holds atoms in a molecule and compound together. They can be ionic, covalent, or metallic (and you'll learn about these in high school chemistry).

• chemical bond

• chemical formula

• chemical symbol

• electron cloud

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Which elements are in the formula shown above?

• Antimony only

• Carbon and Sulfur

• Cesium only

• Carbon and Silicon

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