In the lens formula, 1/f = 1/v - 1/u, what is the sign convention for a convex lens when the image is real?
Anonymous Quiz
43%
v positive
36%
v negative
13%
u positive
7%
f negative
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Which of the following is a balanced chemical equation?
Anonymous Quiz
17%
H2 + O2 → H2O
69%
2H2 + O2 → 2H2O
8%
H2 + 2O2 → 2H2O
7%
2H2 + 2O2 → 2H2O
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What type of reaction is represented by the equation: 2Mg + O2 → 2MgO?
Anonymous Quiz
10%
Decomposition
82%
Combination
6%
Displacement
2%
Double displacement
❤4❤🔥1👍1🕊1
In a chemical equation, the arrow indicates?
Anonymous Quiz
65%
Direction of reaction
19%
Equality
7%
Reversibility
9%
Catalyst
❤5🔥1
Which reaction releases heat?
Anonymous Quiz
16%
Endothermic
79%
Exothermic
4%
Neutralization
1%
Precipitation
❤6
Oxidation is the process of?
Anonymous Quiz
49%
Gain of electrons
41%
Loss of electrons
8%
Gain of protons
2%
Loss of protons
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In the reaction CuO + H2 → Cu + H2O, which substance is reduced?
Anonymous Quiz
53%
CuO
16%
H2
24%
Cu
8%
H2O
❤10
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❤1
A reaction where a single compound breaks down into two or more products is?
Anonymous Quiz
16%
Combination
74%
Decomposition
5%
Displacement
5%
Double displacement
🐳4❤3🕊1
The reaction 2Na + Cl2 → 2NaCl is an example of?
Anonymous Quiz
10%
Decomposition
83%
Combination
5%
Displacement
2%
Oxidation
🕊4❤3
In double displacement reactions, what happens?
Anonymous Quiz
19%
Electrons are transferred
64%
Ions are exchanged
6%
Heat is absorbed
11%
Precipitate is formed always
❤4👍2🕊1
Which of the following is an endothermic reaction?
Anonymous Quiz
25%
Combustion
43%
Photosynthesis
24%
Respiration
8%
Neutralization
❤2👍2🕊1
The reaction Zn + CuSO4 → ZnSO4 + Cu is?
Anonymous Quiz
6%
Combination
9%
Decomposition
73%
Displacement
12%
Double displacement
❤1
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