Unit 5 Chemistry Exam (Balancing and Types of Reactions)

Which of the following is the correct coefficient for aluminum in the balanced reaction of aluminum and copper(II) sulfate?
   $\ldots Al\ +\ \ldots CuSo_4\ \rightarrow\ \ldots Al_2\left(SO_4\right)_2\ +\ \ldots Cu$  

• 1

• 2

• 3

• 4

Which additional product balances the equation for the reaction between zinc metal and hydrochloric acid?
 $Zn\ _{\left(s\right)}\ +\ 2HCl\ _{\left(aq\right)}\rightarrow\ H_{2\left(g\right)\ }+\ \ldots$  

•  $Zn_2HCl$  

•  $ZnCl_2$  

•  $2ZnH$  

•  $2ZnH_2Cl_2$  

Which of the following synthesis reaction of iron(II) hydroxide follows the law of conservation of mass

• $2Fe+O_2+\ 2H2O\rightarrow\ 2Fe(OH)_2$

• $2Fe+2O_2+H_2O\rightarrow\ 2Fe(OH)_2$

• $Fe+O_2+H_2O\rightarrow\ Fe(OH)_2$

• $Fe+O_2+\ 2\ H_2O\rightarrow\ Fe(OH)_2$

Tags

NGSS.HS-PS1-7

Which set of coefficients correctly balances the equation for the chemical reaction between manganese chloride and sodium sulfide?
 $\ldots MnCl_2\ +\ \ldots Na_2S\ \longrightarrow\ldots\ MnS\ +\ NaCl$  

• 1,1,2,2

• 1,1,1,2

• 1,2,1,1

• 1,2,2,1

Complete the following chemical equation:
 $\ldots+3Sn(NO_3)_4\ →\ Sn_3(PO_4)_4+12NaNO_3$  

•  $12NaPO_4$  

•  $6Na_2PO_4$  

•  $4Na_3PO_4$  

•  $Na_{12}PO_4$  

What is the coefficient of NaCl in the balanced formula unit equation?
 $NaClO_3+H_2O+I_2→\ HIO_3+NaCl$  

• 2

• 3

• 4

• 5

Tags

NGSS.HS-PS1-7

Solid ammonium nitrate, , is used as a fertilizer because it decomposes into nitrogen gas, oxygen gas and water vapor. Which of the following best represents the balanced products of this reaction? $NH_4NO_3$  

•  $2N_2+O_2+4H_2O$  

•  $N_2+O_2+H_2O$  

•  $2N+O+2H_2O$  

•  $2N_2+3O_2+4H_2O$  

Hydrogen cyanide (HCN) and water are produced from the reaction of methane ( $CH_4$  ), ammonia ( $NH_3$  ) and oxygen gas. Which of the following best represents the reactants in a balanced equation for this reaction?

•  $2CH_4+2NH_3+3O$  

•  $2CH_4+2NH_3+3O_2$  

•  $CH_4+2NH_3+3O_2$  

•  $CH_4+NH_3+6O$  

According to the law of conservation of mass, which reaction correctly displays the synthesis of nitric acid?

• $N_2O_{5\left(g\right)}+H_2O_{\left(l\right)}\rightarrow HNO_{3\left(aq\right)}$

• $2N_2O_{5\left(g\right)}+H_2O_{\left(l\right)}\rightarrow4HNO_{3\left(aq\right)}$

• $2N_2O_{5\left(g\right)}+\ 2H_2O_{\left(l\right)}\rightarrow HNO_{3\left(aq\right)}$

• $N_2O_{5\left(g\right)}+H_2O_{\left(l\right)}\rightarrow2HNO_{3\left(aq\right)}$

Tags

NGSS.HS-PS1-7

In a redox reaction, what happens to the substance that undergoes oxidation?

• Loses electrons; oxidation number decreases

• Loses electrons; oxidation number increases

• Gains electrons; oxidation number decreases

• Gains electrons; oxidation number increases