Conservation of Mass
What is conservation of matter?
Matter cannot be created or destroyed but can change from one form to another.
How many Hydrogen atom (H) is in the reactants the product?
2H2 + O2 --> 2H2O
There are 4 Hydrogen (H) atoms in the reactants and the product.
Balance the following chemical equation so that is follows the Law of Conservation of Mass.
Fe + O2 --> Fe2O3
Balanced equation is 4Fe + 3O2 --> 2Fe2O3
What are the reactants in the following chemical equation?
CH4 + 2O2 --> CO2 + 2H20
CH4 and 2O2 are the reactants.
What is evidence that a chemical change has occurred?
CH4 + 2O2 --> CO2 + 2H2O
New substance formed.
Was matter conserved in the following reaction?
2H2O2 + 4H20 + 2O2
Yes, matter was conserved, there was the same number and types of atoms on both sides of the reaction.
How many Magnesium (Mg) atoms are in reactants and product of the following chemical reaction?
4Mg + 2O2 --> 4MgO
There are 4 Magnesium (Mg) atoms in the reactants and product of the chemical equation.
Balance the following chemical equation so that if follows the Law of Conservation of Mass.
Co + H2O --> Co2O3 + H2
The balanced equation is:
2Co + 3H2O --> Co2O3 + 3H2
What are/is the product(s) in the chemical reaction below?
N2 + 6H2 --> 2NH6
The product is 2NH6
Which of the following is NOT evidence of a chemical change?
Color Change
New odor
Solid precipitate forms
Change in temperature
Produces light or sound
Change of Phase (state of matter)
Change of Phase is evidence of a physical change
Was matter conserved in the following reaction?
45 grams of CO2 + 50 grams of O2 react to produce
35 grams of H2O and 60 grams of C6H12O6
Yes, there was a total of 95 grams in the reactants and 95 grams produced int he product.
How many molecules of water (H2O) are there in the reactants for the chemical reaction below?
6CO2 + 6H2O --> 6O2 + C6H12O6
There are 6 molecules of water H2O in the reactants of the chemical equation.
Balance the following chemical equation so that it follows the Law of Conservation of Mass.
C3H8 + O2 --> CO2 + H2O
Balanced Equation is C3H8 + 5O2 --> 3CO2 + 4H2O
What are/is the reactant(s) in the following chemical reaction?
HgO2 --> Hg + O2
The reactant is HgO2
Which of the following are evidence of a physical change? (more than one answer)
Change of phase
Produces sound
Change in size/shape
Dissolving
Change in temperature
Change of phase
Change in size/shape
Dissolving
If the following reaction follows the conservation of matter, how much gas was produced in the following chemical equation?
10 kg of baking soda reacts with 25 kg of vinegar to produce 10 kg of water, 20 kg of sodium acetate. How much carbon dioxide gas was also produced?
5 kg of Carbon Dioxide was produced.
How many Phosphorous (P), Oxygen (O) and Hydrogen (H) atoms are in the reactants and products of the chemical reaction?
P4O10 + 6H2O --> 4H3PO4
There are 4 Phosphorous (P) atoms in both the reactants and products.
There are 16 Oxygen (O) atoms in both the reactants and products.
There are 12 Hydrogen (H) atoms in both the reactants and products.
Balance the equation below so that it follows the Law of Conservation of Mass.
C2H6 + O2 --> CO2 + H2O
The balanced equation is:
2C2H6 + 7O2 --> 4CO2 + 6H2O
What are the products of the following chemical reaction?
HCl + NaOH --> NaCl + H2O
The products are: NaCl + H2O
Which of the following is a compound?
1. H2O
2. O2
3. Cl2
4. I2
H2O is a compound because it is made of more than one type of atom.
Using the chemical equation below to answer the question.
4NH3 + 5O2 --> 4NO + 6H2O
40 grams of NH3 used
32 grams of 4NO produced and 16 grams of 6H2O
how many grams of oxygen was used?
There was 8 grams of Oxygen (5O2) used.
40 g NH3 + 8 g 5O2 = 48g
32 g 4NO + 16 g of 6H2O
How many total atoms are found in the reactants and products (they need to be the same for both sides).
C2H6O + 3O2 --> 3H2O + 2CO2
There is a total of 15 atoms in both the reactants and products of the chemical reactions
2 carbons
6 hydrogens
7 oxygen
Balance the following chemical equation below so that is follows the Law of Conservation of Mass.
Fe2O3 + H2SO4 --> Fe2(SO4)3 + H2O
The balanced equation is:
Fe2O3 + 3H2SO4 --> Fe2(SO4)3 + 3H2O
What are the reactants and products of the following chemical reaction?
2Ag + H2S --> Ag2S + H2
The reactants are 2Ag + H2S
The products are Ag2S + H2
Which of the following is NOT a molecule?
NH3
Cl
C6H12O6
HCl
Cl is NOT a molecule. Molecules are made of two or more atoms chemically bonded.