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# Convert the following numbers to standard exponential form

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1. Convert the following numbers to standard exponential form:

a) 0.003621 ________________ b) 0.0847 __________________

c) 15 4 ____________________ d) 536.2 x 103 _______________

2. How many significant figures are there in the following:

a) 0.0549 __________________ b) 10.64 _______________

c) 60204 __________________ d) 357.9 x 105 _______________

3. Add or subtract as indicated. Express to the proper number
of significant figures.

a) 18.20 + 0.005 + 6.321 = __________ b) 6.42 + 4.41 - 64 = _________

c) 600 - 107.6 = _________ d) 75.2 + 145 - 75.03 = _________

4. Multiply or Divide the following problems. Round to the
correct number of significant figures.

a) (64.69)(8.08) = _____________ b) 0.7406/0.144 = _____________

c) (354.43)(4.596) = _____________ d) 345.67/9.01 = _____________

Page 2

5. Write the names of the chemicals shown by their formulas/or the
formulas from the given names.

a) BaCl2 ____________________ b) KMnO4 ___________________

c) H2SO4 ____________________ d) H2O ___________________

e) AgNO3 ____________________

f) sodium hydrogen carbonate _________________

g) nitric acid _________________

h) hydrochloric acid _________________

i) potassium dichromate _________________

j) sodium hydroxide _________________

6. Complete the following conversion factors or problems:

a) 1 cm3. = ______ mL. 1 kg. = ________ g. 10 cm. = _______ mm.

b) convert 6.54 ft to centimeters:

c) convert 1.20 pounds to milligrams: (Use scientific notation for your final answer).

7. Write a balanced chemical equation to represent each of the
following reactions:

a. The decomposition, by heating, of solid mercury(II) nitrate to
produce pure liquid mercury, nitrogen dioxide gas, and oxygen
gas.

b. The reaction of aqueous potassium hydroxide with aqueous
hydrochloric acid (hydrogen chloride) to produce water,
and aqueous potassium chloride.

8. Calculate the formula weight (molar mass) of LiC2H3O2.

9. Calculate the mass of 0.250 moles of LiC2H3O2.

10. In an experiment to test how well methyl alcohol works as an antifreeze, a technician collected a
sample of 175.0 mL of this liquid. Its density is 0.810 g/mL. How many grams of methyl alcohol
were taken?

11. A sample of substance X weighs 115.9 g. Initially at a temperature
of 23.5 oC, its temperature rises to 58.6 oC. If substance X is
found to have a heat capacity of 0.215 cal/g oC, how much heat
was absorbed by the substance?

12. Balance the following equations by inspection. Mark the correct
coefficient in the space provided. NOTE: While we normally do not write
coefficients which equal one in a chemical equation, please do so.

For some reason the symbol for an arrow pointing to the right showed up as a box.

a. ____ Mg + ____ O2 &#61664; ____ MgO

b. ____ CaBr2 + ____ H3PO4 &#61664; ____ Ca3(PO4)2 + ____ HBr

c. ____ Al(OH)3 + ____ HNO3 &#61664; ____ Al(NO3)3 + ____ H2O

d. ____ C4H10 + ____ O2 &#61664; ____ CO2 + ____ H2O

e. ____ Al + ______ HCl &#61664; _____ AlCl3 + _____ H2

https://brainmass.com/chemistry/acids-and-bases/convert-following-numbers-standard-exponential-form-277243

#### Solution Preview

Direction: Answer the questions and show your work in the space provided.

1. Convert the following numbers to standard exponential form:

a) 0.003621 3.621 x 10-3 b) 0.0847 8.47x10-2

c) 15 4 1.54x102 d) 536.2 x 103 5.362x105

Note: What is letter C? 15.4 or 154?
If 15.4 = 1.54 x 101
If 154 = 1.54 x 102

2. How many significant figures are there in the following:

a) 0.0549 3 b) 10.64 4

c) 60204 5 d) 357.9 x 105 4

3. Add or subtract as indicated. Express to the proper number of significant figures.

a) 18.20 + 0.005 + 6.321 = 24.53 b) 6.42 + 4.41 - 64 = -53

c) 600 - 107.6 = 492 d) 75.2 + 145 - 75.03 = 145

4. Multiply or Divide the following problems. Round to the correct number of significant figures.

a) (64.69)(8.08) = 523 b) 0.7406/0.144 = 5.14

c) (354.43)(4.596) = 1,629 d) 345.67/9.01 = ...

#### Solution Summary

The expert concerts numbers to standard exponential forms are examined.

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