WorksheetsCHEM 1311 Exam 1 Quizizz
Total questions: 25
Worksheet time: 32mins
You drop red food coloring into a glass of water, and the water turns red. Is this a physical or chemical change?
Chemical, because the water turns red.
Chemical, because you mix two different substances together.
Physical because a new substance isn't forming.
Which of the following is a physical change?
Burning a leaf
Boiling water
Rust forming on a bike chain
Fireworks exploding
What is the equation for density?
D = Mass / Volume
D = Volume / Mass
D = Volume x Mass
none of the above
The nucleus of an atom contains which subatomic particles?
protons and electrons
protons and neutrons
electrons and neutrons
protons, electrons, and neutrons
which explanation of this notation is correct?
12 is proton #
6 tells you there are 6 neutrons
6 tells you there are 6 protons
12 is not a mass # here
6CO2 + 6H2O → C6H12O6
MgCO3 --> MgO + CO2
How many atoms of each element are in a formula unit of magnesium phosphate?
3 magnesium atoms, 2 phosphorus atoms, 8 oxygen atoms
2 magnesium atoms, 3 phosphorus atoms, 12 oxygen atoms
1 magnesium atom, 1 phosphorus atom, 4 oxygen atoms
2 magnesium atoms, 1 phosphorus atom, 4 oxygen atoms
How many molecules are in 0.105 mol NH3?
5.73 E 24
6.32 E 22
3.45 E 32
9.81 E 21
Calculate the molar mass of ammonium sulfide.
82.16 g/mol
49.10 g/mol
50.11 g/mol
68.15 g/mol
Calculate the percent composition of aluminum oxide.
47.1% Al, 52.9% O
52.9% Al, 47.1% O
28.3% Al, 71.7% O
71.1% Al, 28.3% O
Which of the following chemical equations are balanced correctly?
i. CaCl2(aq) + 2 KF(aq) --> CaF2(s) + 2 KCl(aq)
ii. C4H10(l) + 13 O2(g) --> 4 CO2(g) + 5 H2O(g)
iii. 2 C5H10O(l) + 15 O2(g) --> 10 CO2(g) + 10 H2O(l)
i and ii
iii only
i only
none
How many moles of bromine will react with 0.0500 mole of C2H2 in the reaction C2H2 + 2 Br2 --> C2H2Br4?
0.100 mol
0.186 mol
0.0250 mol
2.00 mol
A chemical reaction resulted in 1.376 g of product, which represented a 78.5 percent yield for the reaction. What is the theoretical yield?
2.58 g
0.89 g
1.75 g
1.20 g
Which of the following best describes a limiting reactant?
The reactant that limits the rate (or speed) of a chemical reaction.
The reactant that limits the position of equilibrium in a reversible chemical change.
A reactant with limited nucleophilic hyperconjugation of its s and p orbitals and therefore limited reactivity.
The reactant that is completely used up by a reaction.
Calculate the grams of alcohol, C2H5OH, in 4.40E2 grams of a 23.0% solution.
13.6g
56g
101g
339g
How many grams of Ba(OH)2 are needed to prepare 2.50 liters of 0.200 M barium hydroxide solution?
77.2g
43.4g
66.8g
85.7g
Nitric acid is commercially available at a concentration of 15.9 M. What volume of this solution must be diluted to a final volume of 1.00 L to prepare a 4.00 M solution?
39.8mL
252mL
456mL
22.2mL
How many degrees Celsius is 367K?
87
94
33
300
