Chemical Principles – Flashcards

123 test answers

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question

A classroom contains 24 chairs.

 

 

 

a. exact number

 

b. inexact number

answer

 

 

 

 

a. exact number

question

There are 60 seconds in a minute.

 

 

a. exact number

 

b. inexact number

answer

 

 

 

 

 

a. exact number

question

A bag of cherries weighs 4.1 pounds.

 

 

a. exact number

 

b. inexact number

answer

 

 

 

 

 

 

b. inexact number

question

A newspaper article contains 421 words.

 

 

a. exact number

 

b. inexact number

answer

 

 

 

 

a. exact number

question

With a high grade measuring device, the volume of a liquid is determined to be 6.321 L. Measurements are taken with lesser-grade equipement. How does it compare in terms of accuracy and precision.

         Test 1      Test 2     Test 3      Test 4

         6.35 L      6.31 L      6.38 L      6.32 L

 

a. accurate and precise

b. inaccurate but precise

c. Inaccurate and inprecise

answer

 

 

 

 

 

c. inaccurate and inprecise

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question

With a high grade measuring device, the volume of a liquid is determined to be 6.321 L. Measurements are taken with lesser-grade equipement. How does it compare in terms of accuracy and precision.

         Test 1      Test 2     Test 3      Test 4

         6.31 L      6.32 L      6.33 L      6.32 L

 

a. accurate and precise

b. inaccurate but precise

c. Inaccurate and inprecise

answer

 

 

 

 

 

a. accurate and precise

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question

With a high grade measuring device, the volume of a liquid is determined to be 6.321 L. Measurements are taken with lesser-grade equipement. How does it compare in terms of accuracy and precision.

         Test 1      Test 2     Test 3      Test 4

         6.36 L      6.35 L      6.35 L      6.36 L

 

a. accurate and precise

b. inaccurate but precise

c. Inaccurate and inprecise

answer

 

 

 

 

 

b. inaccurate but precise

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question

What is the difference between the times 3.3 seconds and 3.30 seconds?

 

 

a. There is no difference

b. 3.3 sec is ±0.1 and 3.30 sec is ±0.01accurate

c. 3.3sec  is ±0.01 and 3.30 sce ±0.001accurate

d. 3.3 sec is ±0.001 and 3.30 sec is ±0.0001accurate

 

answer

 

 

 

 

b. 3.3 sec is ±0.1 and 3.30 sec is ±0.01accurate

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question

Determine the number of significant figures in:

0.00043

 

a. one

b. two

c. four

d. five

answer

 

 

 

 

 

 

b. two

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question

Determine the number of significant figures in:

0.0220022

 

a. four

b. six

c. seven

d. eight

answer

 

 

 

 

 

b. six

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question

Determine the number of significant figures in:

0.30303030

 

a. six

b. seven

c. eight

d. nine

answer

 

 

 

 

c. eight

 

The last zero in a signifcant figure because it occurs after a desimal.

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question

Determine the number of significant figures in:

0.03030303

 

a. six

b. seven

c. eight

d. nine

answer

 

 

 

 

 

 

                           b. seven

 

 

 

 

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question

True or false, these numbers conatin the same amount of signifcant figures:

 

11.01 and 11.00

 

a. True

b. False

answer

 

 

 

 

 

a. True

 

 

The zeroes after a desimal are signifcant

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question

True or false, these numbers contain the same amount of signifcant figures:

 

2002 and 2020

 

a. True

b. False

answer

 

 

 

 

 

 

b. False

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question

True or false, these numbers conatin the same amount of signifcant figures:

 

0.05700 and 0.05070

 

a. True

b. False

answer

 

 

 

 

 

a. True

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True or false, these numbers conatin the same amount of signifcant figures:

 

0.000066 and 660000

 

a. True

b. False

answer

 

 

 

 

 

 

a. True

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question

Round off to the number of significant figures indicated:

 

0.350763 (three)

 

a. 0.350

b. 0.351

c. 0.35

d. 0.3508

answer

 

 

 

 

b. 0.351

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question

Round off to the number of significant figures indicated:

 

653.899 (four)

 

a. 653.8

b. 653.9

c. 654.0

d. 653.90

answer

 

 

 

 

 

b. 653.9

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question

Round off to the number of significant figures indicated:

 

22.55555 (five)

 

a. 22.555

b. 22.556

c. 22.560

d. 22.557

answer

 

 

 

 

 

b. 22.556

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question

Round off to the number of significant figures indicated:

 

0.277654 (four)

 

a. 0.2776

b. 0.2777

c. 0.2778

d. 0.2775

answer

 

 

 

 

 

a. 0.2776

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question

Rewrite so the number only contains two significant figures:

 

0.123

 

a. 0.1

b. 0.12

c. 0.13

d. 0.123

answer

 

 

 

 

 

 

b. 0.12

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question

Rewrite so the number only contains two significant figures:

 

123000

 

a. 123000

b. 120000

c. 100000

d. 12

answer

 

 

 

 

 

b. 120000

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question

Rewrite so the number only contains two significant figures:

 

12.3

 

a. 12.3

b. 12.0

c. 12

d. 12.1

answer

 

 

 

 

 

c. 12

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question

Rewrite so the number only contains two significant figures:

 

0.000123

 

a. 0.0001

b. 0.00

c. 0.00012

d. 0.000123

answer

 

 

 

 

 

 

c. 0.00012

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question

Indicate the number of signifcant figures:

 

4.5 x 4.05 x 4.50

 

a. one

b. two

c. three

d. four

answer

 

 

 

 

 

b. two

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question

Indicate the number of signifcant figures:

 

0.100 x 0.001 x 0.010

 

a. one

b. two

c. three

d. four

answer

 

 

 

 

 

 

a. one

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question

Indicate the number of signifcant figures:

 

655000

6.5500

 

a. one

b. two

c. three

d. four

answer

 

 

 

 

 

c. three

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question

Indicate the number of signifcant figures:

 

6.00

33.000

 

a. one

b. two

c. three

d. four

answer

 

 

 

c. three

 

 

 

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question

Indicate the uncertainy of the problem:

 

12.1 + 23.1 + 127.01

 

a. ±0.1

b. ±0.01

c. ±1

d. ±0.001

answer

 

 

  

 

a. ±0.1 (tenths)

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±Indicate the uncertainy of the problem:

 

43.65 - 23.7

 

a. ±0.1

b. ±0.01

c. ±1

d. ±0.001

answer

 

 

 

 

 

a. ±0.1 (tenths)

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Indicate the uncertainy of the problem:

 

23.6 + 33 + 17.21

 

a. ±0.1

b. ±0.01

c. ±1

d. ±0.001

answer

 

 

 

 

 

 

c. ±1

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Indicate the uncertainy of the problem:

 

4650 + 25 + 200

 

a. ±0.1

b. ±10

c. ±1

d. ±100

answer

 

 

 

 

 

 

d. ±100 (hundreds)

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question

Determine if the exponent will be positive, negative, or zero when expressed in scientific notation.

                            0.0230

a. Positive

b. Negative

c. Zero

 

 

answer

 

 

a. negative

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question

Determine if the exponent will be positive, negative, or zero when expressed in scientific notation.

                            321.7

a. positive

b. negative

c. zero

answer

 

 

 

a. positive

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Determine if the exponent will be positive, negative, or zero when expressed in scientific notation.

                            6.87

a. positive

b. negative

c. zero

answer

 

 

 

c. zero

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question

Determine if the exponent will be positive, negative, or zero when expressed in scientific notation.

                            63002

a. positive

b. negative

c. zero

answer

 

 

 

a. positve

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question

10^5 x 10^3

 

 

a. 10^15

b. 10^8

c. 10^5

d. 10^2

 

answer

 

 

 

a. 10^8

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question

10^-5 x 10^-3

 

 

a. 10^-15

b. 10^-8

c. 10^8

d. 10^2

answer

 

 

 

b.10^-8

 

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question

10^5 x 10^-3

 

 

a. 10^15

b. 10^8

c. 10^2

d. 10^-2

answer

 

 

 

c. 10^2

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10^-5 x 10^3

 

 

a. 10^-8

b. 10^8

c. 10^2

d. 10^-2

answer

 

 

 

d. 10^-2

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Solve: (3.245 x10^3) + (1.17 x 10^3)

 

a. 4.415 x10^3

b.

c.

d. 4.42 x10^3

answer

 

 

 

d. 4.42 x10^3

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Solve: (9.870 x10^-2) - (5.7 x10^-3)

 

a. 9.3 x10^-2

b.

c. 9.30 x10^-2

d.

answer

 

 

 

c. 9.30 x10^-2

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Solve: (9.356 x10^5) + (3.27 x10^5)

 

a. 9.68 x10^5

b.

c.

d.

answer

 

 

 

a. 9.68 x10^5

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Solve: (2.030 x10^4) - (1.111 x10^3)

 

a.

b. 1.92 x10^4

c. 1.919 x10^4

d.

answer

 

 

 

 

c. 1.919 x10^4

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question

 

 

 

Tera = T

answer

 

 

 

10^12

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question

 

 

 

Giga =G

answer

 

 

 

10^9

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question

 

 

 

Mega = M

answer

 

 

 

10^6

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Kilo =k

answer

 

 

 

10^3

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Hecto =h

answer

 

 

 

10^2

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Deca =da

answer

 

 

 

10^1

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Deci =d

answer

 

 

 

10^-1

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Centi =c

answer

 

 

 

10^-2

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Milli = m

answer

 

 

 

10^-3

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Micro =µ

answer

 

 

 

10^-6

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Nano =n

answer

 

 

 

10^-9

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Pico =p

answer

 

 

 

10^-12

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question

 

 

 

Area of a rectangle

answer

 

 

 

A= length x width

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Area of a circle

answer

 

 

 

Area =∏ x Radius^2

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Area of a Triange

answer

 

 

 

Area =½ x base x height

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Volume of Rectanglar Solid

answer

 

 

 

Volume = Length x width x height

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Volume of a Cylinder

answer

 

 

 

Volume = ∏ x radius^2 x height

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Volume of a Sphere

answer

 

 

 

Volume = 4/3 x ∏ x radius^3

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question

 

 

Conversion of Length

 

cm to in.

answer

 

 

 

2.540 cm

1 in.

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Conversion of Mass

 

g to lb

answer

 

 

 

453.6 g

1 lb

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Conversion of Volume

 

L to qt

answer

 

 

 

0.9463 L

1 qt

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Use the appropraite metric prefix to replace scientific notation:

 

6.8 x10^-9 m

answer

 

 

 

6.8 nm

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Use the appropraite metric prefix to replace scientific notation:

 

3.2 x10^-6 m

answer

 

 

 

3.2 µm

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Use the appropraite metric prefix to replace scientific notation:

 

7.23 x10^3 L

answer

 

 

 

7.23 kL

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Use the appropraite metric prefix to replace scientific notation:

 

6.5 x10^9 g

answer

 

 

 

 

6.5 Gg

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Convert: 25mg to g
answer

 

 

0.025mg

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Convert: 323 km to m
answer

 

 

323000 m

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Convert: 25.0 L to dL
answer

 

 

250 dL

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Convert: 0.010 g to pg
answer

 

 

 

? 1.0 x10^9 pg ?

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Convert: 244 lb to kg
answer

111 kg

 

 

244 lb x 453.6 g x   1 kg    = 110.6784 kg

              1 lb       10^3 g

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Convert: 0.250 tons to g
answer

227000 g

 

 

0.250 ton x 2000 lb x 453.6 g = 226800 g

                  1 ton        1 lb

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Convert: 24.2 in to mm
answer

615 mm

 

 

24.2 in x 2.540 cm x 10^2 mm =

                 1 in          1 cm

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Convert: 375 cm^3 to ft^3
answer

1.32 x10^-2 ft^3

 

375 cm^3 x (    1 in   )^3 x ( 1 ft )^3 =

                 (2.540 cm)^3 x (12 in)^3

 

375 x   1^3    x    1 ^3 = 0.013243

        2.54^3      12^3

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All molecules present are triatomic; two substances are present; one phase is present.

 

a. element

b. compound

c. homogeneous mixture

d. heterogeneous mixture

answer

 

d. heterogeneous mixture

 

Heterogeneous (1 phase) mixture (2 substances)

 

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All molecules present are heteroatomic; one substance is present; two phases are present.

 

a. element

b. compound

c. homogeneous mixture

d. heterogeneous mixture

answer

b. compound

 

One substance, heteroatomic

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All molecules present are identical and homoatomic; one phase is present.

 

a. element

b. compound

c. homogeneous mixture

d. heterogeneous mixture

answer

a. element

 

one substance of identical homoatomic molecules

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Both homoatomic and heteroatomic molecules are present; one phase is present.

 

a. element

b. compound

c. homogeneous mixture

d. heterogeneous mixture

answer

c. homogeneous mixture

 

Homogeneos (one phase) mixture (2 types of molecules)

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One kind of homoatomic molecules is present; one phase is present.

 

a. element

b. compound

c. homogeneous mixture

d. heterogeneous mixture

answer
a. element
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All molecules present are diatomic; two substances are present; one phase is present.

 

a. element

b. compound

c. homogeneous mixture

d. heterogeneous mixture

answer

b. homogeneous mixture

 

homogeneous (one phase) mixture (two phases)

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Two kinds of heteroatomic molecules are present; two phases present

 

a. element

b. compound

c. homogeneous mixture

d. heterogeneous mixture

answer

d. heterogeneous mixture

 

Heterogeneous (two phases) mixture (two substances)

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All molecules present are idenetical, triatomic, and heteroatomic; one phase is present.

 

a. element

b. compound

c. homogeneous mixture

d. heterogeneous mixture

answer
d. compound
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What does the atomic number indicate?

 

a. number of protons

b. number of neutrons

c. number of electrons

d. number of protons and electrons

answer

 

 

a. number of protons

 

(a neutral element would have an equal number of protons and eletrons)

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What does the mass number indicate?

 

a. number of protons

b. number of neutrons

c. number of neutrons and protons

d. number of protons and electrons

 

answer

 

c. number of neutrons and protons

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question

Three isotopes exist for argon, element 18.  One isotope has an isotopic mass of 35.967amu and a % abundance of 0.337.  A 2nd isotope has an isotopic mass of 37.963 amu and a % adundance 0f 0.063.  The 3rd isotope has an isotopic mass of 39.962 amu.

What are the mass numbers for the 3 isotopes?

answer

 

1st: 36 (35.967 amu)

 

2nd: 38 (37.963 amu)

 

3rd: 40 (39.962 amu)

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question

Three isotopes exist for argon, element 18.  One isotope has an isotopic mass of 35.967amu and a % abundance of 0.337.  A 2nd isotope has an isotopic mass of 37.963 amu and a % adundance 0f 0.063.  The 3rd isotope has an isotopic mass of 39.962 amu.

What is the % abundance for the 3rd isotope?

answer

 

99.600%

 

(100.000 -0.337 -0.063)% = 99.600%

 

 

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Atoms are the basic building blocks for all kinds of matter

 

a. true

b. false

answer

 

 

 

a. true

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Different types of atmos exist.

 

a. true

b. false

answer

 

 

 

a. true

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All atoms of a give type are identical

 

a. true

b. false

answer

 

 

 

b. false

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NaClO(2)

 

a. compound

b. element

answer

 

 

 

a. compound

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CO

 

a. compound

b. element

answer

 

 

 

a. compound

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S(8)

 

a. compound

b. element

answer

 

 

 

b. element

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Al

 

a. compound

b. element

answer

 

 

 

b. element

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posses a negative charge

 

a. electron

b. proton

c. neutron

d. proton and neutron

answer

 

 

 

a. electron

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Has mass slightly less than a neutron

 

a. electron

b. proton

c. neutron

d. proton and neutron

answer

 

 

 

b. proton

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Can be called a nucleon

 

a. electron

b. proton

c. neutron

d. proton and neutron

answer

 

 

 

 

d. proton and neutron

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heaviest of the three particles

 

a. electron

b. proton

c. neutron

d. proton and neutron

answer

 

 

 

c. neutron

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What element has: 5 protons, 5 electrons, and 6 neutrons?

 

a. 9/4 Be

b. 12/6 C

c. 1/1 H

d. 11/5B

answer

 

 

 

d. 11/5 B

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Compare: 40/20 CA and 41/19 K

 

a. same number of subatomic particles (60)

b. same number of neutrons (20)

c. same number of subatmoc particles (61)

d. same number of neutrons (21)

answer

 

 

 

a. same number of subatomic particles (60)

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Compare: 30/14 Si and 32/16 S

 

a. same number of subatomic particles (16)

b. same number of neutrons (16)

c. same number of subatomic particles (48)

d. same number of neutrons (18)

answer

 

 

 

b. same number of neutrons (16)

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Compare: 23/11 Na and 24/12 Mg

 

a. same number of subatomic particles (24)

b. same number of neutrons (11)

c. same number of subatmoc particles (34)

d. same number of neutrons (12)

answer

 

 

 

d. same number of neutrons (12)

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24/12 X amd 26/12 Q

 

a. isotopes

b. isobars

c. neither

answer

 

 

 

a. isotopes

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71/31 X amd 71/32 Q

 

a. isotopes

b. isobars

c. neither

answer

 

 

 

b. isobars

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56/25 X amd 54/24 Q

 

a. isotopes

b. isobars

c. neither

answer

 

 

 

 

c. neither

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57/27 X amd 60/27 Q

 

a. isotopes

b. isobars

c. neither

answer

 

 

 

a. isotopes

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Calculate atomic mass of Titanium given:

Ti-46 = 7.93% (45.95263 amu)

Ti-47 = 7.28% (46.9518 amu)

Ti-48 = 73.94% (47.94795 amu)

Ti-49 = 5.51% (48.94787 amu)

Ti-50 = 5.34% (49.9448 amu)

answer

47.88 amu

 

0.0793 x 45.95263 = 3.644

0.0728 x 46.9518 = 3.418

0.7394 x 47.94795 = 35. 453      =  47.879

0.0551 x 48.94787 = 2. 697

0.0534 x 49.9448 = 2. 667

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In which of the following pairs of numbers does each member of the pair contain the same number of significant figures?

a. 22.30 and 22.3

b. 314 and 3.14

c. 63,000 and 6,300

d. more than one correct reponse

e. no correct reponse

answer

d. more than one correct reponse

 

both b. and c. contain the same number of signifcant figures b. (3) and c. (2)

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Which of the following statements concerning the significatn of zeros in measured numbers correct?

a. leading zeros are alway significant

b. confinined zeros are always significant

c. trailing zeros are never significant

d. more than one correct anwser

e. no correct anwser

answer

 

 

 

b. confined zeros are alway significant

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In which of the following measured numbers are all of the zeros significant?

a. 0.000003140

b. 3.0101

c. 360, 031, 010

d. more than one anwser is correct

e. no correct response

answer

 

 

 

b. 3.0101

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In which o the following cases is the given number correctly rounded to three significant figures?

a. 241,000 becomes 241

b. 0.3334 becomes 0.334

c. 42.357 becomes 42.3

d. more than one correct response

e. no correct repsonse

answer

 

 

 

c. 42.257 becomes 42.3

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In which of the following pairs of numbers do the two members of the pair have the same uncertainty?

a. 3.102 and 5.134

b. 0.20 and 0.200

c. 301,000 and 300,000

d. more than one correct answer

e. no correct response

answer

 

 

a. 3.102 and 5.134

 

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The calculator anwser obtained from 42.44 x 4.41 x 7.00 is 1013.0428. This anwser:

a. is correct as written

b. should be rounded to 1013

c. should be rounded to 1010

d. more than one correct response

e. no correct response

answer

 

 

 

c. should be rounded to 1010

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The correct answer obtained from adding the measurements 8.1, 3.14, and 97.143 contains:

a. 2 significant figures

b. 3 significant figures

c. 4 significant figures

d. 5 significant figures

e. no correct response

answer

 

 

 

a. 2 significant figures

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Which problem contains only 1 significant figure?

a. 4.0 x (2.3 + 4.5)

b. 3.0 x (3.7 - 3.4)

c. 7.02 x (0.0001 + 0.011)

d. more than one correct response

e. no correct response

answer

 

 

 

c. 7.02 x (0.0001 + 0.011)

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Given that 7 is exact number and 0.13 is a measured number, for which of the following problems does the answer contian 3 significant figures?

a. 7 x 0.13

b. 7/0.13

c. 7 + 0.13

d. more than one correct response

e. no correct response

answer

 

 

e. no correct response

 

all responses only contain 2 significant figures

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In which of the following cases is the given number correctly converted to scientific notation?

a. 321,000 becomes 3.21 x10^4

b. 0.00300 becomes 3 x10^-3

c. 31.040 becomes 3.104 x10^1

d. more than one correct response

e. no correct response

answer

 

 

 ? e. no correct reponse ?

 

a. is incorrect, b. and c. have incorrect significant figures

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question

In which of the following pairs of numbers do the two members have the same uncertainty?

a. 4.80 x10^5 and 4.80 x10^6

b. 3.21 x10^-4 and 3.2 x10^-3

c. 3 x10^-5 and 3.2211 x10^-1

d. more than one correct response

e. no correct response

answer

 

 

? d. 3 x10^-5 and 3.2211 x10^-1 ?

 

0.00003

0.32211

±0.00001

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question

In which of the following pairs of number are the two numbers totally equivalent?

a. 3200 and 3.200 x10^3

b. 0.20 and 2.0 x10^-1

c. 4713.0 and 4.7130 x10^3

d. more than one correct response

e. no correct response

answer

 

 

d. more than one correct response

 

all responses are totally equivalent

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question

Which of the following metric system prefixes is correctly pair with its mathematical meaning?

a. milli- and 10^-2

b. micro- and 10^-6

c. giga- and 10^-9

d. more than one correct response

e. no correct response

answer

 c. micro- and 10^-6

 

 

a. milli- (10^-3) and 10^-2 (centi-)

c. giga- (10^9) and 10^-9 (nano-)

 

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question

In which of the following sequences are the metric system prefixes listed in decreasing size?

a. mega-, giga-, kilo-

b. nano-, micro-, milli-

c. pico-, centi-, deci-

d. more than one correct response

e. no correct repsonse

answer

 

 

 

e. no correct response

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