Concept Questions
What is Avogadro’s number?
6.022 x 1023
How many atoms are in 14 moles of cadmium?
8.4 x 1023 atoms Cd
Convert 2.83 days into seconds
244512 seconds
Determine the number of sig figs for each given value: 0.9010, 180, 20753, 0.00062
0.9010: Four
180: Two
20753: Five
0.00062: Two
Define extensive properties. Give examples.
An extensive property is a feature that depends on the amount of the substance. Examples include volume and mass.
From a lab experiment, your group calculated three final answers: 3.67, 4.01, 3.18. The correct answer 11.56. Are your answers precise, accurate, or a combination of the two?
Precise, not accurate
How many moles are there in 2.00 x 1019 molecules of CCl4?
3.32 x 10-5 moles of CCl4
Convert 0.527 kg to g
527 grams
153 ml + 1.8 ml + 9.16 ml
164 ml
Lucinda weighed a block of granite on a scale. The scale reported the mass as 62.37 grams. Which numbers are certain? Which numbers are estimated by the scale?
Estimated: 7
Certain: 62.3
In order for Joseph to release energy, he must have the capacity for what? Give the definition of this word.
Joseph must have the capacity for WORK. Work is the action of a force through a distance.
How many grams are in 2.4 moles of sulfur?
76.968 grams sulfur
How many centimeters are in 473 feet?
Conversions:
- 12 in = 1 ft
- 1 in= 2.54 cm
14417.04 cm
0.954 - 0.3109
0.643 units
What are the four significant figures rules?
Non-zero digits are always significant
Any zeros between two significant digits are significant
Trailing zeros (those at the end) are significant only if the number contains a decimal point
Zeros to left of the first nonzero digit are insignificant
What is the difference between exothermic and endothermic reactions?
An endothermic uses heat from its surroundings to fuel the reaction. An exothermic release heat i to the surroundings as a product of the reaction.
How many moles are in 9.8 grams of calcium?
0.24451 moles calcium
Convert 12 cm3 to m3
0.000012 m3
(2.5 m) x (2.01 m) x (2.755 m)
14 m3
How much does one mole of O2 weigh?
31.998 grams
When Zoey is describing energy in SI terms, what unit should she use? What unit should she use when describing energy in the English system?
SI: Joule
English: calorie
How many molecules are in 48.0 grams of NaOH?
7.23 x 1023 molecules NaOH
Convert 173.2 cm/s to miles/hr
Conversions:
- 1 mile = 1600 m
3.897 mph
16.15 / 2.7
6.0 units
Name the SI base units for Length, Mass, Time, Temperature, Amount of substance
Length: Meters
Mass: Kilogram
Time: Second
Temperature: Kelvin
Amount of substance: Mole