
Chemistry Challenge
Authored by Abiyo Ayele
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10th Grade

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20 questions
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1.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the pH of a solution with a hydrogen ion concentration of 1 x 10^-3 M?
6
3
4
5
2.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
In a neutralization reaction, what are the products when an acid reacts with a base?
Heat and light
Salt and water
Acid and base
Gas and solid
3.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Which element is the most electronegative on the periodic table?
Neon
Helium
Oxygen
Fluorine
4.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
How many moles of oxygen are in 2 moles of CO2?
4
3
2
5
5.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the molecular geometry of a molecule with 4 bonding pairs and 0 lone pairs?
Trigonal Planar
Linear
Octahedral
Tetrahedral
6.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
Define an acid according to the Arrhenius definition.
A substance that increases the concentration of oxygen in a solution
A substance that dissociates in water to produce hydrogen ions (H+).
A substance that releases hydroxide ions (OH-) in water
A substance that forms salts when reacting with bases
7.
MULTIPLE CHOICE QUESTION
30 sec • 1 pt
What is the general formula for a combustion reaction?
O2 + H2O -> CO2 + fuel
CO2 + H2O -> fuel + O2
fuel + O2 -> CO2 + H2O
fuel + O2 -> CO2 + H2O2
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