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