basic chemistry exam #1

calculate the percent error a. a known value of 5.65 is measured to be 5.80 b. a known value of 1245 is measured to be 1241.

a. 2.7% b. 0.3%

how many significant figures are in the following measurements? what is the uncertainty in each of the measurements? a. 1508 cm b. 300.00 ft c. 20.003 lb D. 0.00705 gal

a. 4 , +-1 cm b. 4, +- 0.1 ft c. 5, +- 0.001 lb d. 3, +- 0.00001 gal

multiply/divide the numbers expressed in scientific notation a. (8.25 x 10^-5)x(5.442 x 10^-3) b. (4.68 x 10^16)/(9.1 x 10^-5)

a. 4.49 x 10^-7 b. 5.1 x 10^20

express each of the following numbers in scientific notation a. 47,500 b. 5,030,000

a. 4.75 x 10^4 b. 5.03 x 10^6

round off the "measurements" a. 2.34 x 3.225 b. 11.688/4.0 c. (0.56 x 11.73)+ 22.34

a. 7.55 b. 2.9 c. 28.9

a gas substance such as carbon dioxide has no definite shape and definite volume

false

a physical change is a transformation of one substance into one or more other substances

false

density is what type of property

intensive

density is a relationship between

mass/volume

a soldi changing into a liquid is what type of change

physical

convert 100.1 g to kg

0.1001 kg

it takes 628 J to raise the temperature of a 125-g quantity of silver from 25.00 C to 32.14 C. what is the specific heat of silver in Joules?

0.704 J/g x C

how man j make up a kj

10 ^3

How many grams are in a kilogram?

1000 grams

how many m is in a km

10^3

how many in are in a ft

12

what is -10.0 C in Fahrenheit

14.0 F

how many grams are in a milliliter?

2.16g

how many cm are in an inch

2.54 cm

a sample of pure substance is found to have a mass of 52.11 g. As shown below, a measured quantity of water has a volume of 12.5 mL. When the substance is placed in the water, it sinks and the volume of the water and substance now read 31.8 mL. What is the density?

2.70 g/ml

what is the volume in milliliters occupied by 485 g of table salt?

225 mL

what is the percent by mass of a solution of NaCI if 1.75 g of NaCI is dissolved in 5.85 g of H20?

23.0%

what is 102 F in celsius?

39 C

how many qt are in a gal

4

it takes 628 J to raise the temperature of a 125-g quantity of silver from 25.00 C to 32.14 C. what is the actually temperature change?

7.14

what is the total mass of NaCI of 1.75 g of NaCI is dissolved in 5.85 g of H20?

7.60 g

What is the formula for density?

D=mass/volume

How to find Joules

T= T(final)-T(initial)