Chemistry (Practice Exam Closer Look Part 2)
Hydrogen's three isotopes:
- protium - deuterium - tritium
Perform the following calculation with measured numbers, and give the answer with the correct number of significant figures: 45.26 x 0.010 88 hint: just multiply, but add up! (must have the same number of sfs) (same sf as the lowest number)
0.4924 Because both measurements have four SFs, the answer should have four SFs.
Perform the following calculation with measured numbers, and give the answer with the correct number of decimal places: 4.259 - 3.8
0.5 That's correct because 3.8 has one decimal place, the answer has one decimal place.
Perform the following calculation with measured numbers, and give the answer with the correct number of decimal places: 82.45 + 1.245 + 0.000 56
83.70 That's correct because 82.45 has the fewest number of decimal places, two, the answer has two decimal places.
Fahrenheit Equation
Tf = 1.8(Tc) + 32
Celsius Equation
Tf-32 Tc= ------ 1.8
The SI unit for Volume is:
cubic meter
Tf =
1.8 x Tc + 32
A hot tub reaches a temperature of 40.6°F. What is that temperature in degrees Fahrenheit? Tf = 1.8(Tc) + 32 Tf = 1.8(40.6) + 32
105°F
In the process of making ice cream, rock salt is added to the crushed ice to chill the ice cream mixture. If the temperature drops to -11*c, what is it in degrees Fahrenheit? Tf = 1.8(Tc) + 32 Tf = 1.8(-11) + 32
12°F
What temperature is -10.°C on the Fahrenheit scale? Tf = 1.8(Tc) + 32 Tf = 1.8(-10) + 32
14°F
Round off the measurement 3.8468 x 103^ g to two significant figures.
3.8 x 103 g That's correct because the first digit to be dropped is 4, which is less than 5, it and all the following digits are dropped.
On a hot day, the thermometer read 95 °F. What is the temperature in degrees Celsius? Tf-32 Tc= ------ 1.8 95-32 Tc= ------ 1.8
35°F
A child has a temperature of 103.6°F. What is this temperature on a Celsius thermometer? 103.6-32 Tc= ------ 1.8
39.8°F
Perform the following calculation and give the answer with the correct number of significant figures: 8.5 × 4.182 ----------- = 0.0780
460 That's correct because 8.5 has the fewest number of significant figures, which is two, the final answer has two SFs. The 5 in the ones place is dropped after increasing the last retained digit by 1 and is replaced by a placeholder zero.
The metric unit used to measure temperature is the:
Celsius
In the SI system, temperature is measured using the:
Kelvin
Tf = 1.8(Tc) + 32
Temperature Equation (to obtain degrees Fahrenheit)
The metric unit used to measure mass is the:
gram
The SI unit of mass, the _____
kilogram
The metric unit used to measure volume is the:
liter
The metric or SI unit used to measure length is the:
meter
