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?
Use the chemical reaction to answer the question
4Fe + 3O2 --> 2Fe2O3
What happens to atoms of Fe and O2 during the reaction?
Use the chemical reaction to answer the question
4Fe + 3O2 --> 2Fe2O3
What happens to atoms of Fe and O2 during the reaction?
(1) They are rearranged.
(2) They gain mass.
(3) They maintain their properties.
(4) They are lost.
which is most likely to occur during a chemical reaction?
(1) The original substance maintains its properties.
(2) Atoms of the original are lost.
(3) Mass is conserved.
(4) New atoms are created.
Use the chemical reaction to answer the question
NaHCO3 + HC2H3O2 --> NaC2H3O2 + H20 + CO2
A student mixes baking soda (NaHCO3) and acetic acid (HC2H3O2) to produce a chemical reaction shown. Which statement about the reaction is correct?
(1) The atoms of the reactants are regrouped during the reaction.
(2) Atoms of Na are destroyed during the reaction.
(3) There are more h atoms after the reaction.
(4) Some atoms gain mass after the reaction.
Use the chemical reaction to answer the question
2H2 + O2 --> 2H2O
There are four atoms of hydrogen (H) before the reaction. how many atoms of hydrogen are present after the reaction?
2
8
5
4
The chemical reaction shows that calcium carbonate (CaCO3) decomposes into carbon dioxide (CO2) and calcium oxide (CaO).
To find the total mass of the products, we need to calculate the molar mass of each product and then multiply it by the number of moles produced.
1. Calculate the molar mass of calcium carbonate (CaCO3):
Ca: 40.08 g/mol
C: 12.01 g/mol
O: 16.00 g/mol (There are three oxygen atoms in CaCO3)
Molar mass of CaCO3 = 40.08 + 12.01 + (16.00 * 3) = 100.09 g/mol
2. Calculate the molar mass of carbon dioxide (CO2):
C: 12.01 g/mol
O: 16.00 g/mol (There are two oxygen atoms in CO2)
Molar mass of CO2 = 12.01 + (16.00 * 2) = 44.01 g/mol
3. Calculate the molar mass of calcium oxide (CaO):
Ca: 40.08 g/mol
O: 16.00 g/mol
Molar mass of CaO = 40.08 + 16.00 = 56.08 g/mol
4. Convert the mass of calcium carbonate (30 grams) to moles:
moles = mass / molar mass
moles of CaCO3 = 30 g / 100.09 g/mol = 0.2997 mol
5. Using the balanced chemical equation, we can see that the ratio of moles of CaCO3 to moles of CO2 and CaO is 1:1:1. So, the moles of CO2 and CaO produced will also be 0.2997 mol.
6. Calculate the mass of CO2 and CaO using moles and molar mass:
Mass of CO2 = moles of CO2 * molar mass of CO2
= 0.2997 mol * 44.01 g/mol
= 13.2 g
Mass of CaO = moles of CaO * molar mass of CaO
= 0.2997 mol * 56.08 g/mol
= 16.8 g
Therefore, the total mass of the products (CO2 and CaO) is 13.2 g + 16.8 g = 30 g.
During the reaction, the atoms of iron (Fe) and oxygen (O2) undergo a chemical transformation. The reactants are iron (Fe) and oxygen gas (O2), and the product formed is iron oxide (Fe2O3).
In the reaction, four atoms of iron (4 Fe) combine with three molecules of oxygen gas (3 O2) to form two molecules of iron oxide (2 Fe2O3).
The four atoms of iron on the reactant side are rearranged to form two molecules of iron oxide (Fe2O3) on the product side. Similarly, the six atoms of oxygen from the three molecules of oxygen gas are also rearranged to form two molecules of iron oxide (Fe2O3).
Therefore, during the reaction, the atoms of iron (Fe) and oxygen (O2) are rearranged to form new compounds, which is iron oxide (Fe2O3). The number and type of atoms on both sides of the reaction are balanced, following the law of conservation of mass.
The correct answer is:
(1) They are rearranged.
During the chemical reaction, the atoms of iron (Fe) and oxygen gas (O2) are rearranged to form iron oxide (Fe2O3). The iron atoms combine with oxygen molecules to form iron oxide molecules, resulting in a rearrangement of the atoms to form new compounds. The number and type of atoms on both sides of the reaction are balanced, indicating a rearrangement rather than loss or gain of atoms. The properties of iron and oxygen do not change during the reaction - they maintain their respective properties.
The correct answer is:
(3) Mass is conserved.
During a chemical reaction, mass is always conserved, meaning the total mass of the reactants equals the total mass of the products. This is in accordance with the law of conservation of mass. While some substances may undergo changes in properties or rearrangement of atoms, the overall mass of the system remains constant. Atoms cannot be created or destroyed, so the number of atoms before the reaction will be the same as the number of atoms after the reaction.
The correct answer is:
(1) The atoms of the reactants are regrouped during the reaction.
During a chemical reaction, the atoms of the reactants are rearranged to form different compounds, the products. In this particular reaction, baking soda (NaHCO3) and acetic acid (HC2H3O2) react to form sodium acetate (NaC2H3O2), water (H2O), and carbon dioxide (CO2). The atoms of the reactants (Na, H, C, O) are regrouped and combined differently in the products. This rearrangement of atoms is a fundamental aspect of a chemical reaction.