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Physical Science > Unit 2 test flashcards > Flashcards

Unit 2 test flashcards

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1
Q

Exothermic or endothermic? Burning wood.

A

exothermic

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2
Q

Covalent bonds form between…

A

non-metals

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3
Q

What type of chemical reaction occurs when 1 substance breaks down into 2 or more substances?

A

decomposition

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4
Q

Requires energy, Endothermic, Delta H is positive

A

Requires energy, Endothermic, Delta H is positive

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5
Q

What type of chemical reaction occurs when two compounds swap partners?

A

Double Replacement

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6
Q

What type of chemical reaction occurs when 2 or more substances combine to form another?

A

synthesis

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7
Q

Exothermic or endothermic? Baking a cake.

A

endothermic

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8
Q

How can you tell if a reaction is endothermic?

A

the temperature decreases

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9
Q

What type of energy is released during the fusion or fission of atoms?

A

nuclear

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10
Q

Ionic bonds always form between metals and ___________.

A

non-metals

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11
Q

What is a half-life (in science)?

A

the amount of time for half a radioactive sample to decay

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12
Q

Covalent drawings use…

A

circles

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13
Q

When drawing an ionic compound draw the

A

lewis structures & transfer with arrow and add charges

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14
Q

What is nuclear fusion?

A

combining 2 small atoms into 1

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15
Q

What is a concern about nuclear energy?

A

nuclear radioactive waste exposure which can be fatal to living things

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16
Q

What type of chemical reaction occurs when 1 element replaces another?

A

Single Replacement

17
Q

Covalent Bonds

A

share

18
Q

Do endothermic reactions produce or absorb energy?

A

absorb

19
Q

Is this equation balanced? Li + O2 → Li2O

A

no

20
Q

Is this equation balanced? PbO2 → PbO + O2

A

no

21
Q

What does a catalyst do?(Science question)

A

makes a chemical reaction faster

22
Q

What is half life?

A

time for half the nuclei to decay

23
Q

Is this equation balanced? LiCl + Na → Li + NaCl

A

yes

24
Q

Is this equation balanced? 2NaCl + MgO → MgCl2 + Na2O

A

yes

25
Q

What type of reaction is: Mg + O2 → MgO

A

sythesis

26
Q

Law of conservation of mass

A

mass of reactants = mass of products

27
Q

What type of reaction is O2 + CH3OH → H2O + CO2

A

combustion

28
Q

What type of reaction is NaOH + H2SO4 → Na2SO4 + H2O

A

Double Replacement

29
Q

What is a coefficient?

A

the big number in front of an element/compound

30
Q

Reactions with only one reactant are…

A

decomposition

31
Q

Exothermic reactions…

A

release heat

32
Q

What coefficient should go in the blank: 1PCl5 + 4H2O → ___HCl + H3PO4

A

5

33
Q

What coefficient should go in the blank: Na2CO3 + ___HCl → 2NaCl + H2O + CO2

A

2

34
Q

Which is NOT a sign of a chemical reaction?

A

dissolving

35
Q

FISSION OR FUSION: Can generate most energy

A

fusion

Physical Science (17 decks)

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