. rusting iron b. an apple ripening c. cutting paper d. a piece of wood burning 3. In a reaction in which hydrogen reacts with oxygen to produce water, which substances are the reactants? a. hydrogen only b. oxygen only c. both hydrogen and oxygen d. water 4. In a chemical equation, the symbol that takes the place of the word ‘yield’ is a(n) a. equal sign b. coefficient c. plus sign d. arrow 5. Assume that the number of oxygen molecules on the left side of the equation
Ionic Equilibrium
Chemical equilibrium and ionic equilibrium are two major concepts in chemistry. Ionic equilibrium deals with the equilibrium involved in an ionization process while chemical equilibrium deals with the equilibrium during a chemical change. Ionic equilibrium is established between the ions and unionized species in a system. Understanding the concept of ionic equilibrium is very important to answer the questions related to certain chemical reactions in chemistry.
Arrhenius Acid
Arrhenius acid act as a good electrolyte as it dissociates to its respective ions in the aqueous solutions. Keeping it similar to the general acid properties, Arrhenius acid also neutralizes bases and turns litmus paper into red.
Bronsted Lowry Base In Inorganic Chemistry
Bronsted-Lowry base in inorganic chemistry is any chemical substance that can accept a proton from the other chemical substance it is reacting with.
please answer all questions
1. Which of the following statements is FALSE?
a. A chemical equation must be balanced.
b.
c. Subscripts are whole numbers used to balance chemical equations.
d. A chemical reaction is the interactions of atoms, molecules or ions to form one or more substances.
2. Which of the following is NOT an example of a chemical change?
a. rusting iron
b. an apple ripening
c. cutting paper
d. a piece of wood burning
3. In a reaction in which hydrogen reacts with oxygen to produce water, which substances are the reactants?
a. hydrogen only
b. oxygen only
c. both hydrogen and oxygen
d. water
4. In a chemical equation, the symbol that takes the place of the word ‘yield’ is a(n)
a. equal sign
b. coefficient
c. plus sign
d. arrow
5. Assume that the number of oxygen molecules on the left side of the equation in the figure is held at one. What can you do to balance the equation?
a. Nothing; it is already balanced.
b. Change the molecule on the right by adding another oxygen atom.
c. Add one NO molecule and one NO2 molecule to the equation.
d. Add two NO molecules and two NO2 molecules to the equation.
6. Why can’t you change the formula in order to balance a reaction?
a. The number of atoms on the left should be equal to the atoms on the right of the arrow.
b. The elements that combine have definite composition and fixed proportion of elements by mass.
c. The elements have definite mass ratios.
d. The molecule is indestructible.
7. The word equation “magnesium reacts with chlorine to produce magnesium chloride” is represented by which of the following equations?
a. Mg → Cl2 + MgCl2
b. MgCl2 → Mg + Cl2
c. MgCl2 + Mg → Cl2
d. Mg + Cl2 → MgCl2
8. In a chemical reaction, what is the relationship between the total mass of the reactants and the total mass of the products?
a. They must be equal.
b. The mass of the products must be greater.
c. The mass of the reactants must be greater.
d. There is no general relationship between the two.
9. In balancing a chemical equation, which of the following are you allowed to do?
a. change subscripts
b. write coefficients
c. change superscripts
d. add new substances
10. Which of the following symbols means a substance is in water solution? a. (aq)
b. (s)
c. (w)
d. (l)
11. Balancing a chemical equation involves
a. adjusting the subscripts
b. adjusting the coefficients
c. adjusting both subscripts and coefficients
d. calcium the masses of reactants and products
12. Calcium hydroxide plus sulfuric acid will yield
a. calcium sulfate and hydrogen b. calcium oxide and sulfur
c. calcium sulfate and water
d. calcium sulfate and sulfurous acid
13. Which of the following gives the coefficients for the equation: ___NH3 + ___O2 -------- ___NO + ___H2O
a. 2,5,2,6
b. 4,5,4,5
c. 4,5,3,6
d. 4,5,4,6
14. 3HgCl2 + 2Al ------- 3Hg + 2AlCl3 is classified as
a. combination reaction
b. decomposition reaction
c. single-displacement reaction
d. double-displacement reaction
15. The number of atoms of sulfur in Al2(S2O3)3 is
a. two
b. three
c. five
d. six
16. Given (NH4) + and (SO4) 2- the correct formula of ammonium sulfate
a. NH4SO4
b. (NH4)2SO4
c. NH4(SO4)2
d. (NH4)3SO4
17. When aluminum reacts with dilute hydrochloric acid, what gas is released?
a. hydrogen
b. oxygen
c. nitrogen dioxide
d. chlorine
18. What is the correct name of Cu(NO3)2?
a. copper nitrate
b. copper(II) nitrate
c. copper nitrite
d. copper(II) nitrite
19. All the following equations are balanced except
a. 3AgNO3 + AlCl3 Al(NO3)3 +3 AgCl
b. CaCO3 + 2HNO3 Ca(NO3)2 + CO2 + H2O
c. 2H2S + 3O2 2H2O + SO2
d. 2Fe + 3Cl2 2FeCl3
20. Which of the following is a combination reaction?
a. C6H12O6 + 6O2 6CO2 + 6H2O
b. CO2 + H2O H2CO3
c. H2CO3+ Ca(OH)2 2H2O +CaCO3
d. Fe2O3 +3CO 2Fe + 3CO2
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