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5
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Which of the following is a balanced chemical equation?
C + O2 â CO
N2 + H2 â 2NH
H2 + O2 â H2O
NaCl + H2O â NaOH + Cl2
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banana
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seesaw
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shark
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thief
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5
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Which of the following is an example of a chemical change? Melting ice, Boiling water , Burning paper , Cutting paper
Burning paper
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thief
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gift
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fairy
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thief
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5
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In a chemical equation, what does the arrow (â) represent?
react to form
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Which of the following statements best describes an exothermic reaction?
It releases heat to the surroundings
It absorbs heat from the surroundings.
It remains at a constant temperature.
It doesn't involve heat transfer.
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In an endothermic reaction, the products have _____ energy than the reactants.
B) Equal
A) More
C) Less
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When an ice cube melts, is the process exothermic or endothermic?
A) Exothermic
B) Endothermic
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What is the law of conservation of mass in chemistry?
Mass cannot be created or destroyed in a chemical reaction.
Mass can be created but not destroyed in a chemical reaction
Mass can be destroyed but not created in a chemical reaction
Mass remains constant in a chemical reaction, unless it's a
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monster
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rocket
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rocket
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thief
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5
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When two or more substances combine to form a new substance, it is called a:
chemical reaction
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When ammonium nitrate dissolves in water, it feels cold to the touch. Is this process exothermic or endothermic?
A) Endothermic
B) Exothermic
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What is the balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH)?
HCl + NaOH â NaCl + H2O
HCl + NaOH â H2O + Na2Cl
HCl + NaOH â NaHCl + O2
HCl + NaOH â HClO + Na2
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What is the total number of atoms in one molecule of water (H2O)?
3
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Which of the following is a strong acid?
Vinegar (acetic acid)
Lemon juice (citric acid)
Hydrochloric acid (HCl)
Milk (lactic acid)
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