Chemistry Quizizz and Answers
There are _____ molecules of methane in 0.123 mol of methane (CH4) :
2.04 x 10^-25
Calculate the ka of a solution with a pkb of 3.38
2.40 x 10^-11
The [OH-] = 4.0 x 10^-9, what is the pH of the solution :
5.7
Theoretical yield : 73 g Actual yield : 62 g Calculate the percent yield.
85%
What is the mass of one mole of (NH4)2CO3?
96 g
In a polar covalent bond, electrons are shared :
Unequally
What type of orbital is shaped like a clover?
d orbital
Ammonia is a weak base. Its concentration is 0.150M and its Kb value is 1.7 x 10-5. Calculate its pH.
11.2
If the [H+] of a solution is 8.4 x 10^-3 mol/L the pOH of the solution will be :
11.92
The measurement, 206 cm, has how many significant (measured) digits?
3
The charge on the iron ion in the salt Fe2O3 is ____.
3+
Add the following numbers and report your answer using significant figures : 2.5 cm +0.50 cm + 0.055 cm = ?
3.1 cm
If the pH of a solution is 5.6 the pOH is :
8.4
Which one of the following is the correct electron configuration for a nitrogen atom?
(up/down), (up/down), (up/up/up)
Uric Acid is a weak monoproctic acid. It's initial concentration is 0.110M and it's equillibrium concentration of H+ ions is 0.034M. Calculate the final concentration of Uric acid.
.076
If the [H3O+] of a solution is 1 x 10^-8 mol/L the [OH-] is :
1.0 x 10 ^-6
If the pH of a solution is 5 the [H+] is :
1.0 x 10^-5 M
How many moles of carbon dioxide are there in 52.06 grams of carbon dioxide?
1.183
4NH3 +5O2 --> 4NO + 6H2O : How many grams of NO are formed if 6.30 g of ammonia react with 1.80 g oxygen?
1.35 g
Formic acid is a weak monotropic acid. Its initial concentration is 0.10 M and its equillibrium concentration of H+ ions is 0.0042 M. Calculate the Ka value.
1.8 x 10 -4
Acetic Acid is a weak monotropic acid. Its concentration is 0.20M and its equillibrium concentration of [H+] ions is 0.0019 M Calculate its Ka value.
1.8 x 10 -5
Multiply the following three numbers and report your answer to the correct number of significant figures. 0.020 cm x 50 cm x 11.1 cm =?
11 cm^3
Limes have a [H3O+] of 1.3 x 10^-2 mol/L Their pOH is :
12.11
A pH and a pOH will add up to :
14
What pH is the strongest base?
14
A compound contains 6.0 g of carbon and 1.0 g of hydrogen. The percent composition of the compound is ?
14% hydrogen, 86% carbon
If the [H+] of a solution is 1 x10 ^-2 mol/L the Ph is :
2
If the [H+] of a solution is 1.0 x 10^-2 mol/L the pH is :
2
What is the maximum number of electrons that an orbital can have?
2 electrons
Gallic Acid is a weak monoproctic acid. Its concentration is 0.280M and its equillibrium concentration of H+ ions is 0.0033M. Calculate its pH value.
2.48
The measurement, 20,600 molecules has how many significant figures?
3
Isobutlyamine is a weak base. Its initial concentration is 0.55M and its equillibrium concentration of OH- ions is 0.0040 M. Calculate its Kb value.
3.1 x 10 -4
If the [OH-] of a solution is 2.7 x 10^-4 mol/L the pOH of the solution:
3.56
P4 + 6Cl2 --> 4PCl3 : The reaction of 75.0 g P4 with excess chlorine gas produces 110g PCl3 in lab. Find the theoretical yield and calculate percent yield for the reaction.
33%
What is the measurement to the right to the correct number of significant figures.
35.0 mL
18 L of O2 would have how many molecules :
4.8 x 10^23
The measurement, 0.0020600 mole g, has how many significant digits:
5
If a solution has a pOH of 5.2 the [OH-] of the solution is :
6 x 10^-6 M
Calculate the Kb of a solution that has a pKb of 4.2 :
6.3 x 10^-5
If the substance is neutral, what would the pH be?
7
Calculate the pkb of a solution with a pka of 6.9
7.1
2.00 gallons is equal to how many liters?
7.57 L
What is the percentage of iron in iron(|||)oxide :
70%
If the [H+] of a solution is 6.8 x 10^-9 mol/L the pH is :
8.17
A lone pair is defined as :
A pair of non-bonding electrons
Which has a pH below 7?
Acid
A solution with a [H+] of 9.4 x 10^-5 mol/L is said to be :
Acidic
Turns litmus red
Acids
Which of the following are properties of acids?
All of these answers are correct
Which has a slippery texture?
Base
What is the conjugate base of HCIO4?
CIO 4-
The ions Ca^2+ and PO4^-3 form a salt with the formula :
Ca3(PO4)2
In this Lewis Structure, the symbol above the S means...
Electrons are more attracted to F than H
Which of the following is a polar molecule?
H2O
Which acid produces the strongest conjugate base?
HCN (?)
When dissolved in water, acids produce :
Hydrogen ions
What type of ion does a base produce when it is dissolved in water :
Hydroxide
Which relationship relates Ka, Kb, Kw??
Kb = Kw/Ka
How many electrons does potassium need to gain or lose to become stable?
Lose 1
A compound consists of 72.2% Magnesium(Mg) and 27.8% nitrogen (N), by mass. What is the empirical formula?
Mg3N2
Given the following : 42.07% Na, 18.89% P, and 39.04% O, determine the empirical formula.
Na3PO4
When 12 moles of O2 react with 1.1 mole of C10H8 what is the limiting reactant? C10H8 + 12 O2 --> 10 CO2 + 4H2O
Oxygen
In the quantum-mechanical model of the atom, an orbital is defined as a :
Region of the most probable electron location.
Human blood has a pH between 7.35 and 7.45. Which of the following best describes human blood?
Slightly basic
What is the chemical formula of the compound formed between strontium ions and nitrogen ions?
Sr3N2
Electronectivity is a measure of :
The attraction of paired electrons.... bond?
According to the VSPER theory, if there are five electron domains in a valence shell of an atom, they will be arranged in a(n) ___ geometry.
Trigonal Bi___?
The higher the concentration of negative (hydroxide) ions in the solution, the stronger the base is.
True
The electron configuration of Fe is :
___
The electron configuration of Ga is :
____
Which of the following shows a correct way to balance chemical equations :
____
The pH value of an acid represents its ____ of positive ions in the solution :
concentration
In the Lewis Structure of ______ which central atoms do not have a lone pair of electrons. (select all possible)
ii, iii, iv
Anions tend to be ____, and cations tend to be _____ :
nonmetals, metals