Use the chemical reaction to answer the question.
CaCO3→CO2+CaO
A scientist heats 30 grams of calcium carbonate ( CaCO3
) in the chemical reaction shown. What is the total mass of the products?
(1 point)
Responses
10 grams
10 grams
60 grams
60 grams
15 grams
15 grams
30 grams
The total mass of the products can be calculated by summing the mass of carbon dioxide (CO2) and the mass of calcium oxide (CaO).
According to the balanced chemical equation, 1 mole of CaCO3 produces 1 mole of CO2 and 1 mole of CaO. The molar mass of CaCO3 is 100 g/mol, so 30 grams would be 0.3 moles.
Since the stoichiometry is 1:1, this means that 0.3 moles of CO2 and 0.3 moles of CaO would be produced.
The molar mass of CO2 is 44 g/mol, so the mass of 0.3 moles of CO2 would be 13.2 grams.
The molar mass of CaO is 56 g/mol, so the mass of 0.3 moles of CaO would be 16.8 grams.
Therefore, the total mass of the products is 13.2 grams (CO2) + 16.8 grams (CaO) = 30 grams.
Which is most likely to occur during a chemical reaction?
(1 point)
Atoms of the original substance are lost.
New atoms are created.
The original substance maintains its
properties.
Mass is conserved.
The most likely occurrence during a chemical reaction is that mass is conserved. This means that the total mass of the reactants and products remains the same. In other words, atoms are not lost or created during a chemical reaction. The law of conservation of mass states that matter cannot be created or destroyed, only re-arranged. Therefore, the total mass of the substances involved in a chemical reaction will always remain constant.
Which is most likely to occur during a chemical reaction?
(1 point)
Atoms of the original substance are lost.
New atoms are created.
The original substance maintains its properties.
Mass is conserved.
The most likely occurrence during a chemical reaction is that mass is conserved.
Use the chemical reaction to answer the question.
A student mixes baking soda ( ) and acetic acid
( ) to produce a chemical reaction shown.
Which statement about the reaction is correct?
(1 point)
NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2
NaHCO3
HC2H3O2
The atoms of the reactants are regrouped
during the reaction.
Some atoms gain mass after the reaction.
There are more H atoms after the reaction.
Atoms of Na are destroyed during the
reaction.
The correct statement about the reaction is: The atoms of the reactants are regrouped during the reaction.
In the given chemical reaction: NaHCO3 + HC2H3O2 → NaC2H3O2 + H2O + CO2, the atoms of the reactants (sodium bicarbonate and acetic acid) are rearranged to form the products (sodium acetate, water, and carbon dioxide). No atoms are destroyed or gained mass. The number of atoms of each element remains the same before and after the reaction, they are just rearranged to form different molecules.