NAME: CHEMISTRY 10 date: Instructions: Closed book & notes ...

NAME:________________________ CHEMISTRY 10

date: _________

Instructions: Closed book & notes. All work should be shown and logical for full or partial credit. Express all answers to

correct number of significant figures and units. Draw a box around reported answers(s) or use the space provided if any.

Quiz 1 (Use the unit conversion table on the reverse side of this page) ? 20 points- 40 minutes

1) Perform the indicated mathematical operations and report to correct significant figures.(2 pts each).

17.532 - 15 + 4.04 =

(9.6 10-7)(1.24 10-3)

1.897 10-2

2) Determine the number of significant figures in each of the following and express using scientific notation

and proper choice of prefix.

(4 pts)

Sig. Fig.

Sci. notation

Express with proper metric prefix

0.00000070 m

_____

__________

___________

10600000 g

_____

__________

___________

3) Convert the blood cholesterol level of 1.75 g/L in the standard units of mg/dL.

(2 pts)

4) 550 mL of milk has a mass of 242 g. Find the milk's density in lb/gal units.

__________ (4 pts)

__________

5) Calculate energy (kJ) required to heat 755 g of water from room temperature (25 ?C) to 95 ?C.

specific heat of water: 4.184 J/(g.?C)

(2 pts)

__________

6) A gold jewelry contains 12.5% gold by mass. Calculate mass (kg) of jewelry which contains 1.75 lb of

pure gold.

(4 pts)

7) What is the difference between an element and a compound?

__________ (2 pts)

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