Concepts
Saltwater is an example of this type of mixture because it looks the same throughout
homogeneous mixture (solution)
How many significant Figures are in 1800000
2
Your history essay takes you 74 minutes to complete. How many seconds did you spend working on the essay?
4400s or 4.4 * 103s
What is the freezing point of water in degrees Kelvin?
- Hint: 𝑇K = 𝑇C + 273.15
273.15K
How many protons, electrons, and neutrons are present in an atom of 6529Cu
Protons: 29
Electrons: 29
Neutrons: 36
_______ are pure substances that consist of only one type of atom, while _____ are pure substances that consist of 2 or more elements chemically bonded
Elements ; Compounds
Solve this problem, ensuring you are rounding to the proper number of Significant Figures.
3.456 * 2.1
7.3
How many nm are in 7.2km?
7.2 * 1012 nm
What is the mass 23.0 mL sample of Aluminum with a density of 2.70 g/mL?
62.1g
How many protons, electrons, and neutrons are present in an atom of Cl-37
Protons: 17
Electrons: 17
Neutrons: 20
Volume increases when more substance is added, making it this type of property
Extensive Property
Solve this problem, ensuring you are rounding to the proper number of Significant Figures.
780 + 6.97 - 81.197
706
A cyclist rides 18.6 miles during a training session. Convert this distance to meters (m). (1 mile = 5280 ft) (1 ft = 12 in) (1 in = 2.54 cm)
29900m or 2.99 * 104m
Convert 3°K to F.
- (TF − 32) ÷ 1.8 = TC ; (𝑇𝐶× 1.8) + 32 = 𝑇𝐹 ; 𝑇K = 𝑇C + 273.15
-454F
Lithium has two naturally occurring isotopes, Li-6 and Li-7. Li-7 has a fractional abundance of 0.9241. What is the fractional abundance of Li-6?
0.0759
A student repeatedly measures the mass of a sample and gets 5.01 g, 5.01 g, and 5.02 g. However, the true mass is 5.50 g. This data set is best described as this.
precise, but not accurate
Solve this problem, ensuring you are rounding to the proper number of Significant Figures.
(15.02−14.8) ÷ (0.0320×1.5)
5
Change a speed of 72.4 miles per hour to its equivalent in meters per second.(1mi=5280ft)(1inch=2.54cm).
32.4 m/s
A 2.75 kg sample of a substance occupies a volume of 250.0 cm3. Find its density in g/cm3
11.0 g/cm3
Calculate the atomic mass of chlorine, given that naturally occurring chlorine consists of:
75.77% 35Cl, mass = 34.9689 g/mol
24.23% 37Cl, mass = 36.9659 g/mol
35.45 g/mol
Two samples of pure water are collected—one from a lake and one made in a lab. Even though their sources are different, they always contain hydrogen and oxygen in the same mass ratio. This observation illustrates this law.
Law of definite proportions
Solve this problem, ensuring you are rounding to the proper number of Significant Figures.
(7.46 + 11.5) / (6.2 * 14.1 + 5.73)
0.20
Veterinarians sometimes use troy units when measuring small quantities of medication. A particular dose of a medication has a mass of 7.5 grains.
Express this mass in kilograms, given the following conversions:
24 grains (gr) = 1 pennyweight (dwt)
20 pennyweight = 1 troy ounce (oz t)
1 troy ounce = 31.103 grams
1 kilogram (kg) = 1000 grams (g)
4.9 * 10-4kg
A block of plastic taken from a laboratory bench has a mass of 2.85 kg and a volume of 3.20 L. Calculate the density of the plastic block. Express your answer in both kg/L and g/mL.
0.891kg/L and 0.891g/mL
Calculate the atomic mass of bromine, given that bromine has two naturally occurring isotopes:
79Br, mass = 78.9183 g/mol, natural abundance = 50.69%
81Br, mass = 80.9163 g/mol, natural abundance = ?
70.90 g/mol