Which option is an example of a chemical reaction that occurs at a very slow rate?
Responses
alcohol burning
alcohol burning
iron rusting
iron rusting
an explosion
an explosion
dissolving an antacid tablet
iron rusting
Which statement about chemical reaction rates is true?
Responses
The reaction rates can change.
The reaction rates can change.
The reaction rates are always constant.
The reaction rates are always constant.
The reaction rates cannot increase.
The reaction rates cannot increase.
The reaction rates cannot decrease.
The reaction rates can change.
How can the rate of a reaction be increased?
Responses
decreasing the amount of reactants
decreasing the amount of reactants
having more surface area
having more surface area
diluting a solution
diluting a solution
lowering the temperature
decreasing the amount of reactants
having more surface area
diluting a solution
increasing the temperature
How can the rate of a reaction be increased?
Responses
decreasing the amount of reactants
having more surface area
diluting a solution
lowering the temperature
Apologies for the repetition in the previous response. To answer your question, the rate of a reaction can be increased by:
- Increasing the concentration or amount of reactants
- Increasing the surface area of the reactants (e.g., breaking solids into smaller pieces)
- Increasing the temperature of the reaction
- Using catalysts to lower the activation energy of the reaction
- Increasing the pressure in a gaseous reaction (if applicable)
How can the rate of a reaction be decreased?
Responses
reducing the surface area
reducing the surface area
adding a catalyst
adding a catalyst
increasing the amount of reactants
increasing the amount of reactants
raising the temperature
Reducing the surface area
Adding a catalyst
Increasing the amount of reactants
Raising the temperature
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I'm sorry, but the equation you provided doesn't make sense. Could you please clarify or provide more information?
What does conserving mass mean in a chemical equation?
Responses
There are more of each type of atom on the product side than on the reactant side.
There are more of each type of atom on the product side than on the reactant side.
There is equal number of each type of atom on the reactant and product side.
There is equal number of each type of atom on the reactant and product side.
There is an unequal number of each type of atom on both sides of the equation.
There is an unequal number of each type of atom on both sides of the equation.
There are more of each type of atom on the reactant side than on the product side.
There are more of each type of atom on the reactant side than on the product side.
There is an equal number of each type of atom on the reactant and product side.
Consider the equation:
CH4+O2→2H2O+CO2
Which element or elements are unbalanced in this equation?
Responses
Both Hand Oare unbalanced.
Both , uppercase H, and , uppercase O, are unbalanced.
Only the His unbalanced.
Only the , uppercase H, is unbalanced.
C, H, and Oare all unbalanced.
uppercase C, , , uppercase H, , and , uppercase O, are all unbalanced.
Only the Ois unbalanced.
Both , uppercase H, and , uppercase O, are unbalanced.
What needs to be done in order to balance this equation?
HCl + Ba → BaCl2 + H2
Responses
Place a 2 in front of the Ba.
Place a 2 in front of the upper case B lower case a .,
Place a 2 in front of the HCl and a 2 in front of the Ba.
Place a 2 in front of the upper case H C lower case l and a 2 in front of the upper case B lower case a .,
It is already balanced.
It is already balanced.
Place a 2 in front of the HCl.
Place a 2 in front of the upper case H C lower case l .,
To balance the equation HCl + Ba → BaCl2 + H2, you need to place a 2 in front of the HCl and a 2 in front of the Ba.
Which equation is balanced?
Responses
Na+F2→2NaF
upper case N lower case a plus upper case F subscript 2 end subscript rightward arrow 2 upper case N lower case a upper case F
Al+3O2→Al2O3
upper case A lower case l plus 3 upper case O subscript 2 end subscript rightward arrow upper case A lower case l subscript 2 end subscript upper case O subscript 3 end subscript
Mg+2O2→2MgO
upper case M lower case g plus 2 upper case O subscript 2 end subscript rightward arrow 2 upper case M lower case g upper case O
2Al+3F2→2AlF3
The equation that is balanced is 2Al+3F2→2AlF3.
Chromium (Cr) can combine with chlorine (Cl2) to form chromium chloride (CrCl3).
Which equation is a correct representation of this reaction?
Responses
2Cr + 3Cl2 → CrCl3
2 upper case C lower case r plus 3 upper case C lower case l subscript 2 end subscript rightward arrow upper case C lower case r upper case C lower case l subscript 3 end subscript,
2Cr + Cl2 → CrCl3
2 upper case C lower case r plus upper case C lower case l subscript 2 end subscript rightward arrow upper case C lower case r upper case C lower case l subscript 3 end subscript,
2Cr + 3Cl2 → 2CrCl3
2 upper case C lower case r plus 3 upper case C lower case l subscript 2 end subscript rightward arrow 2 upper case C lower case r upper case C lower case l subscript 3 end subscript,
Cr + Cl2 → CrCl3