Question

select all the correct answers. which changes will increase the rate of reaction during combustion? decreasing the area of contact between the reactants adding more oxygen to the reaction removing heat from the reaction changing the reactants from solid form to powdered form lowering the exposure of the reactants to air

Explanation:

Step1: Analyze effect of contact area

Decreasing contact area slows reaction. So, decreasing the area of contact between the reactants is incorrect.

Step2: Analyze effect of oxygen

Combustion is a reaction with oxygen. Adding more oxygen provides more reactant, increasing reaction rate. So, adding more oxygen to the reaction is correct.

Step3: Analyze effect of heat

Heat provides energy for reaction. Removing heat slows reaction. So, removing heat from the reaction is incorrect.

Step4: Analyze effect of reactant form

Powdered form has more surface - area than solid form. Changing to powdered form increases contact area and reaction rate. So, changing the reactants from solid form to powdered form is correct.

Step5: Analyze effect of air exposure

Lowering air exposure reduces oxygen availability. So, lowering the exposure of the reactants to air is incorrect.

Answer:

Adding more oxygen to the reaction, Changing the reactants from solid form to powdered form