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# Eleventh Grade (Grade 11) Reactions Questions

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You know that you have a balanced chemical equation when the
1. coefficients of the reactants equal the coefficients of the products.
2. number of atoms of each element in the reactants equal that of each corresponding element in the products.
3. products and reactants are the same chemicals.
4. subscripts of the reactants equal the subscripts of the products.
Based on the Law of Conservation of Mass, we know that the mass of the reactants
1. always be more than the total mass of the products.
2. always be less than the total mass of the products.
3. sometimes be more and sometimes be less than the total mass of the products.
4. always be equal to the total mass of the products.
Which of the following must always be true for any kind of chemical reaction?
1. The masses of the products and the reactants are equal.
2. The mass of the products is greater than that of the reactants.
3. The number of atoms in the reactants must change when products are formed.
4. The reactants require the absorption of heat for a reaction to occur.
What is the Greek prefix for the number 4?
1. tetra-
2. hepta-
3. hexa-
4. deca-
Balancing a chemical equation requires manipulation of the
1. coefficients.
2. subscripts.
3. formulas of the products.
4. number of the product.
Which statement correctly defines an exothermic reaction?
1. A chemical reaction with evolution of heat
2. A chemical reaction with absorption of heat
3. A chemical reaction with no change in internal energy
4. A chemical chemical with no change in temperature
In all chemical equations, the products' collective mass
1. is less than the reactants' total mass.
2. is greater than the reactants' total mass.
3. is equal to the reactants' total mass.
4. has no quantitative relationship to the reactants' total mass.
One or more substances changing into one or more new substances is defined as a
1. physical change.
2. precipitate.
3. solution.
4. chemical reaction.
A substance present at the start of a reaction is called a
1. product.
2. group.
3. precipitate.
4. reactant.
A substance that is formed during a reaction is called a(n)
1. element.
2. compound.
3. product.
4. reactant.
All of the following are clear indicators that a chemical change has occurred EXCEPT
1. the formation of a precipitate.
2. the production of a gas (bubbles).
3. heat and light.
4. a change in the total mass of substances.
1. $NaCl + AgNO_3 rarr AgCl darr + NaNO_3$
2. $NaOH + HCl rarrNaCl + H_2O$
3. $Fe^(2+) + Ce^(4+ ) hArr Fe^(3+) + Ce^(3+)$
4. $CH_3COOH + NaOH -> CH_3COONa + H_2O$