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Chemistry 12 Test > Chemistry 12 Test > Flashcards

Chemistry 12 Test Flashcards

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1
Q

The coefficients of a balanced chemical equation indicate the relative number of……of reactants and products.

A

Moles

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2
Q

All stoichiometric calculations begin with a…….

A

Balanced equation

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3
Q

Only….and….are conserved in every reaction,moles,volumes, and representative particles may not be.

A

Mass and atoms

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4
Q

In solving stoichiometric problems, conversion factors relating moles of reactants to…..of products are used.

A

Moles

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5
Q

If you assume….., the balanced equation also tells you about the volumes of gases.

A

Standard temperature and pressure

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6
Q

Stoichiometry

A

The calculations of quantities in chemical reactions

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7
Q

Product

A

A substance formed in a chemical reaction

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8
Q

Coefficient

A

Gives the relative number of molecules involved in a reaction

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9
Q

6.02 x 10 (23)

A

Avogadro’s number

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10
Q

0 degrees Celsius, 101.3 kPa

A

STP

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11
Q

Mole ratios from balanced equations may be used to solve problems with other units such as numbers of…..and…..of gases at STP.

A

Particles and volume

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12
Q

The…..from the balanced equation are used to write conversion factors called……

A

Mole ratios

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13
Q

These conversion factors are used to calculate the numbers of moles of…….from a given number of moles of……..

A

Product; reactant

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14
Q

In mass-mass calculations, the molar mass is used to convert mass to…..

A

The number of moles unknown

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15
Q

The coefficients in a balanced chemical equation can be used to form mole ratios relating reactants to products.
At,st,or nt?

A

AT

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16
Q

The coefficients in a balanced chemical equation tell the relative volumes of reactants and products, expressed in any suitable unit of volume.
At,st,or nt?

A

ST

17
Q

To calculate the mass of a molecule in grams, you can use the molar mass and Avagadro’s number.
At,st,or nt?

A

AT

18
Q

Because the mass of the reactants equals the mass of the products of a reaction, the number of moles will be conserved.
At,st,or nt?

A

ST

19
Q

If the ratio of molecules in the reaction 2 A2+B2->2 A2 is 2:1:2, we can predict that 4 molecules of A2 react with 2 molecules B2 to produce 4 molecules of A2B.
At,st,or nt?

A

AT

20
Q

One mole of any gas occupies a volume of 22.4L.

At,st,or,nt?

A

ST

21
Q

In mass-mass calculations, the molar mass is used to convert mass to moles.
At,st,or nt?

A

AT

22
Q

In a volume-volume problem, the 22.4L/ mol factors always cancel out.
At,st,or nt?

A

AT

23
Q

In stoichiometric problems, volume is expressed in terms of liters.
At,st,or nt?

A

ST

24
Q

For a mass-mole problem, the first conversion from mass to moles is skipped.
At,st,or nt?

A

AT

25
Q

For a mass-mass problem, the first conversion is from moles to mass.
At,st,or nt?

A

NT

26
Q

Because mole ratios from balanced equations are exact numbers, they do not enter into determination of significant figures.
At,st,or nt?

A

AT

Chemistry 12 Test (1 decks)

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