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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
In an endothermic reaction, the products have _____ energy than the reactants.
 
A) More
 
B) Equal
 
C) Less
When an ice cube melts, is the process exothermic or endothermic?
 
A) Exothermic
 
B) Endothermic
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.
What is the balanced chemical equation for the reaction between hydrochloric acid (HCl) and sodium hydroxide (NaOH)?
 
HCl + NaOH → NaCl + H2O
 
HCl + NaOH → H2O + Na2Cl
 
HCl + NaOH → NaHCl + O2
 
HCl + NaOH → HClO + Na2
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
Which of the following is a strong acid?
 
Hydrochloric acid (HCl)
 
Vinegar (acetic acid)
 
Lemon juice (citric acid)
 
Milk (lactic acid)
Which of the following is a balanced chemical equation?
 
N2 + H2 → 2NH
 
C + O2 → CO
 
NaCl + H2O → NaOH + Cl2
 
H2 + O2 → H2O
In a chemical equation, what does the arrow (→) represent?
react to form
Which of the following is an example of a chemical change? Melting ice, Boiling water , Burning paper , Cutting paper
Burning paper
What is the total number of atoms in one molecule of water (H2O)?
3
When two or more substances combine to form a new substance, it is called a:
chemical reaction
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