Chemical Science Mid Term A5
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case? C4H10(g) + O2(g) → CO2(g) + H2O(g)
8
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? Sn + NaOH → Na2SnO2 + H2
1
When the following equation is balanced using the smallest possible integers, what is the coefficent of oxygen gas? C3H8(g) + O2(g) → CO2(g) + H2O(g)
5
Balance this equation using the smallest possible integers, NO + NH3 → Ν2 + H2O. What is the coefficient of the water?
6
Balanced chemical equations imply which of the following?
Numbers of atoms are conserved in chemical change.
When the following equation is balanced using the smallest possible integers, what is the coefficent of oxygen gas? C7H16(g) + O2(g) → CO2(g) + H2O(g)
11
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case? Sr(s) + P4(s) → Sr3P2(s)
6
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? C2H6 + *O2 → CO2 + H2O
7
When the following equation is balanced using the smallest possible integers, what is the coefficent of oxygen gas? C5H12(g) + O2(g) → CO2(g) + H2O(g):
8
When the following equation is balanced using the smallest possible integers, what is the coefficent of oxygen gas? C3H8O(g) + O2(g) → CO2(g) + H2O(g)
9
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? KClO3 → KCl + KClO4
3
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case? Al2O3(s) + H2SO4(aq) → Al2(SO4)3(aq) + H2O(l)
3
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case? N2(g) + O2(g) → N2O3
3
You are asked to balance the chemical equation H2 + O2 → H2O. How many of the following ways are correct ways to balance this equation? I. 2H2 + O2 → 2H2O II. H2 + O2 → H2O III. 4H2 + 2O2 → 4H2O IV. H2 + O2 → H2O2
3
In balancing an equation, we change the __________ to make the number of atoms on each side of the equation balance.
coefficients of substances
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? Al + Fe3O4 → Al2O3 + Fe
9
When the following equation is balanced using the smallest possible integers, what is the coefficent of oxygen gas? C7H16O(g) + O2(g) → CO2(g) + H2O(g)
21
Consider a reaction given by the equation aA + bB → cC + dD. In this equation A, B, C, D represent chemicals, and a, b, c, d represent coefficients in the balanced equation. For a given reaction, how many values are there for the quantity "c/d"?
1
How many of the following are true concerning balanced chemical equations? I. The number of molecules is conserved. II. The coefficients for the reactants tell you how much of each reactant you are given. III. Atoms are neither created nor destroyed. IV. The coefficients indicate the mass ratios of the substances used. V. The sum of the coefficients on the reactant side equals the sum of the coefficients on the product side.
1
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? P4O10 + H2O → H3PO4
1
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case? S(s) + O2(g) → SO2(g)
1
Balance this equation using the smallest possible integers, S + HNO3 → H2SO4 + NO2 + H2O. What is the coefficient of water.
2
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? NBr3 + NaOH → N2 + NaBr + HOBr
2
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? Na2S2O3 + I2 → NaI + Na2S4O6
2
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case? Li(s) + O2(g) → Li2O(s)
2
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case? Pb(s) + AgNO3(aq) → Pb(NO3)2 + Ag(s)
2
When the equation Si(s) + HF(aq) → SiF4(g) + H2(g) is balanced, what is the coefficient for HF?
4
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? CH3OH + O2 → CO2 + H2O
4
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? MnO2 + HCl → MnCl2 + Cl2 + H2O
4
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? SiCl4 + H2O → SiO2 + HCl
4
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case? CH3OH(l) + O2(g) → CO2(g) + H2O(g)
4
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case? Sb(s) + O2(g) → Sb2O5(s)
4
When the following equation is balanced using the smallest possible integers, what is the number in front of the substance in bold type? PCl5 + H2O → H3PO4 + HCl
5
When the following equations are balanced using the smallest possible integers, what is the number in front of the underlined substance in each case? C2H6(g) + O2(g) → CO2(g) + H2O(g)
7
When the following equation is balanced using the smallest possible integers, what is the coefficent of oxygen gas? C5H12(g) + O2(g) → CO2(g) + H2O(g)
8
Which of the following statements about chemical reactions is false? In balancing a chemical equation, all subscripts must be conserved. When one coefficient is doubled, the rest of the coefficients in the balanced equation must also be doubled. The subscripts in a balanced equation tell us the number of atoms in a molecule. An individual coefficient in a balanced equation is meaningless. The phases in a chemical reaction tell us the nature of the reactants and products.
In balancing a chemical equation, all subscripts must be conserved.
Balanced chemical equations imply which of the following? Numbers of molecules are conserved in chemical change. Numbers of atoms are conserved in chemical change. Volume is conserved in chemical change. A and B
Numbers of atoms are conserved in chemical change.
Which of the following statements is not true of balancing a chemical equation? Subscripts in the reactants must be conserved in the products. Coefficients are used to balance the atoms on both sides. The law of conservation of matter must be followed. Phases are often shown for each compound but are not critical to balancing an equation. All of the above statements (a-d) are true.
Subscripts in the reactants must be conserved in the products.
