Chemistry Semester Exam review

For something to become a theory what must occur?

• One scientist must prove his hypothesis

• Many scientists must be able to recreate the results of a hypothesis.

• everybody thinks it is correct

• scientist must vote evey year

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NGSS.HS-LS4-1

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NGSS.HS-PS2-1

What is the lewis dot structure for K Potassium?

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NGSS.HS-PS1-1

What happens when a Group 1 and a Group 7 element react?

• an ionic bond forms from transferred electrons

• A covalent bond forms form shared electrons

• and explosion occurs

• an ionic bond forms from shared electrons

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NGSS.HS-PS1-1

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2 non metals reacting form which type of bond?

• Covalent

• metalic

• ionic

• loving

What is the correct Formula and charge for the Nitrate ion?

• NO₂^-1

• NO₃⁺¹

• NO₃⁺²

How do you catch a unique rabit?

• money

• unique up on him

What is the formula for this compound?

Zinc(II) Nitrate

• Zn(NO₃)₂

• ZnNO₃

• Zn₂(NO₂)₂

• Peter

A pure substance contains only one type of element or compound.

Which of the following is a pure substance?

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NGSS.MS-PS1-1

What is the dot structure for the ionic compound NaCl?

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NGSS.HS-PS1-1

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How many bonds does Carbon form when bonding covalently?

• 1

• 2

• 4

• 1,000,000

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NGSS.HS-PS1-1