Balancing Chemical Equations Question Preview (ID: 60542)


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The chemical formula for ammonia is NH3. What composes this compound?
a) 1 sodium and 3 helium atoms
b) 3 sodium and 3 hydrogen atoms
c) 3 nitrogen and 3 helium atoms
d) 1 nitrogen and 3 hydrogen atoms

Which chemical equation is balanced to show that matter is conserved during the reaction?
a) CaCO3 ---- CaCO2 + CO2
b) C + H2O ---- CO + H2
c) N2 + 3H2 ----3NH3
d) SO2 + O2 ---- 2SO4

A substance has one atom of sodium and one atom of chlorine. What is the chemical symbol for the compound?
a) NaCl
b) H2O
c) O2
d) N2

A student does an experiment with baking soda and vinegar. She measures the masses of the baking soda and vinegar and combines them in an open beaker. She then calculates the mass of the resulting liquid and finds the mass has decreased. Why?
a) A gas was produced in the reaction and it escaped into the open air
b) A solid was produced in the reaction that precipitated
c) The scale used to weigh the substance was not accurate
d) The temperature of the reactants was lower than the products

Which statement about the Law of the Conservation of Mass is true?
a) The mass of the products can be less than the mass of the reactants
b) The mass of the products must be equal to the mass of the reactants
c) The mass of the final products can be more than the mass of the reactants
d) The mass of the reactants must be more than the mass of the products

Which chemical equation supports the Law of Conservation of Matter?
a) 2H + O2 ---- 2H2O
b) H2 + O2 ---- H2O
c) H2 + O2 ----2H2O
d) 2H2 + O2 ---- 2H2O

The mass of chemical A is 2g, and the mass of chemical B is 5g. If the two chemicals react in a chemical reaction, what is the mass of the end products?
a) 2g
b) 3g
c) 7g
d) 10g

How is the Law of Conservation of Matter best represented in a chemical reaction?
a) The mass of the products is greater than the mass of the reactants
b) The mass of the reactants is greater than the mass of the products
c) The mass of the reactants is equivalent to the mass of the products
d) The mass of the reactants has no relationship to the mass of the products

Balance the following chemical equation: Na2O + AlBr3 ---- NaBr + Al2O3 What is the sum of the coefficients for ALL of the reactants and products when this equation is balanced?
a) 4
b) 6
c) 10
d) 12

What atoms make up carbon dioxide?
a) 1 Ca and 2 O
b) 2 Ca and 1 O
c) 1 C and 2 O
d) 2 C and 1 O

What is the 2 called in the reactants of the balanced equation H2 + Cl2 ---- 2HCl
a) Subscript
b) Coefficient
c) Atomic Number
d) Atomic Mass

What does the arrow represent in the chemical equation?
a) Breaks apart
b) Combines
c) Chemically reacts
d) Yields

How many total ATOMS are found in ONE molecule of Aluminum Phosphate which has the chemical formula of AlPO4?
a) 3
b) 4
c) 5
d) 6

The chemical formula for glucose is C6H12O6. How many atoms are found in one molecule of glucose?
a) 3
b) 4
c) 24
d) 25

During a reaction, one molecule of nitrogen (N2) reacts with three molecules of hydrogen (H2) to give two molecules of ammonia (NH3). What is the total number of nitrogen atoms in the PRODUCT?
a) 1
b) 2
c) 4
d) 8

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