chem chapter 7
The compound sodium sulfate is soluble in water. When this compound dissolves in water, which ion listed below would be present in solution? The compound sodium sulfate is soluble in water. When this compound dissolves in water, which ion listed below would be present in solution? Na22+ S2- O2- SO42- none of the above
SO42
Which of the following is NOT evidence that a chemical reaction has occurred? Which of the following is NOT evidence that a chemical reaction has occurred? gas formation when chemicals are contacted with each other solid formation when chemicals are contacted with each other emission of light when chemicals are contact with each other color change when chemicals are contacted with each other All of the above are evidence of a chemical reaction.
all r evidence of chem reaction
balance this equation CO2(g)+CaSiO3(s)+H2O(l)→SiO2(s)+Ca(HCO3)2(aq)
2CO2(g)+CaSiO3(s)+H2O(l)→SiO2(s)+Ca(HCO3)2(aq)
how can you tell a chemical reaction occured
color change, solid formation, gas formation, formation of a new compound, heat emission/absorbtion, light emission,
Gaseous acetylene (C2H2) reacts with oxygen gas to form gaseous carbon dioxide and gaseous water. Express your answer as a chemical equation. Identify all of the phases in your answer.
2C2H2(g)+5O2(g)→4CO2(g)+2H2O(g)
Gaseous carbon monoxide reacts with oxygen gas to form carbon dioxide gas. Express your answer as a chemical equation. Identify all of the phases in your answer.
2CO(g)+O2(G)→2CO2(g)
Fe(s)+S(l)→Fe2S3(s)
2Fe(s)+3S(l)→Fe2S3(s)
tarting with the unbalanced equation for the combustion of ethanol, C2H5OH(l)+O2(g)→CO2(g)+?H2O(l) what coefficient should be placed in front of H2O to balance the hydrogen atoms?
3! at first i put 6 but if it were six then right side would have total 12 hydrogen
NO2(g)+H2O(l)→HNO3(aq)+NO(g) Express your answer as a chemical equation. Identify all of the phases in your answer
3NO2(g)+H2O(l)→2HNO3(aq)+NO(g)
Starting with the partially balanced equation, C2H5OH(l)+O2(g)→?CO2(g)+3H2O(l) what coefficient should be placed in front of CO2 to balance the carbon atoms?
2
GOT WRONG during hw Enter an equation for the precipitation reaction that occurs (if any) when solutions of potassium hydroxide and nickel(II) bromide are mixed. Express you answer as a chemical equation including phases.
2KOH(aq)+NiBr2(aq)→2KBr(aq)+Ni(OH)2(s)
NaCl(aq)+Hg2(C2H3O2)2(aq)→ Express your answer as a chemical equation. Enter noreaction if no precipitate is formed
2NaCl(aq)+Hg2(C2H3O2)2(aq)→2NaC2H3O2(aq)+Hg2Cl2(s)
Starting with the partially balanced equation, C2H5OH(l)+?O2(g)→2CO2(g)+3H2O(l) what coefficient should be placed in front of O2 to balance the oxygen atoms?
3!
How many oxygen atoms are on the right side of this equation? C2H5OH(l)+O2(g)→2CO2(g)+3H2O(l)
7! There are 2 CO2 molecules contributing 4 atoms of oxygen. In addition, there are 3 H2O molecules accounting for an additional 3 atoms. Be sure that you have used both sources of oxygen correctly.
How many oxygen atoms are on the reactant side of this chemical equation? K2CO3(aq)+Pb(NO3)2(aq)→2KNO3(aq)+PbCO3(s)
9 . remember, reactant is the RIGHT side of equation, product is LEFT side
Chlorine gas reacts with aqueous potassium iodide to form solid iodine and aqueous potassium chloride. Express your answer as a chemical equation. Identify all of the phases in your answer.
Cl2(g)+2KI(aq)→I2(s)+2KCl(aq)
copper(II) nitrate and barium sulfide Express your answer as a chemical equation. Enter noreaction if no precipitate is formed. Identify all of the phases in your answer.
Cu(NO3)2(aq)+BaS(aq)→CuS(s)+Ba(NO3)2(aq)
Which compound is soluble in water? Which compound is soluble in water? CuS Fe(OH)2 AgCl CuCl2
CuCl2 To determine whether or not a compound is soluble, refer to solubility rules. Identify the ions present in each compound then apply the rules to determine if the compound is soluble or insoluble. The chloride ion (Cl-) is normally soluble, and Cu2+ is not one of the exceptions to the rule. Therefore, CuCl2 is soluble.
K2SO4(aq)+BaBr2(aq)→ Express your answer as a chemical equation. Enter noreaction if no precipitate is formed.
K2SO4(aq)+BaBr2(aq)→BaSO4(s)+2KBr(aq)
potassium sulfate and lead(II) acetate express as chemical equation
K2SO4(aq)+Pb(C2H3O2)2(aq)→PbSO4(s)+2KC2H3O2(aq)
Solid lithium oxide reacts with liquid water to form aqueous lithium hydroxide. Express your answer as a chemical equation. Identify all of the phases in your answer.
Li2O(s)+H2O(l)→2LiOH(aq)
MnO2(s)+HCl(aq)→Cl2(g)+MnCl2(aq)+H2O(l) Express your answer as a chemical equation. Identify all of the phases in your answer
MnO2(s)+4HCl(aq)→Cl2(g)+MnCl2(aq)+2H2O(l)
calcium nitrate and sodium iodide Express your answer as a chemical equation. Enter noreaction if no precipitate is formed. Identify all of the phases in your answer.
No reaction
sodium carbonate and lead(II) nitrate Express your answer as a chemical equation. Enter noreaction if no precipitate is formed. Identify all of the phases in your answer.
Pb(NO3)2(aq)+Na2CO3(aq)→PbCO3(s)+2NaNO3(aq)
Which of the following compounds is SOLUBLE? aluminum carbonate aluminum sulfide aluminum sulfate aluminum hydroxide none of the above
aluminum sulfate
Which of the following compounds is INSOLUBLE? magnesium phosphate magnesium iodide magnesium nitrate magnesium sulfate none of the above
magnesium phosphate
Complete and balance each of the following equations. If no reaction occurs, write noreaction . KI(aq)+BaS(aq)→
noreaction
NaC2H3O2(aq)+Pb(NO3)2(aq)→ Express your answer as a chemical equation. Enter noreaction if no precipitate is formed
noreaction
Balancing an equation
the numbers on each type of atom on both sides of the equation are equal. to balance an equation, we insert coefficents, NOT subscripts- in front of the chemical formulas as needed to make the number of each type of atom in the reactant to equal the number of atoms in the product.
t or f the formation of a new substance indicates a chemical reaction has occurred.
true
When balancing equations, only adjust the __________ not the ___________
when balancing equations, only adjust the coeffients not the subscripts
