The minus sign in rate `= - (d[A])/(dt)` indicates the _______ in concentration of the ______ with time. The rate of a reaction is always _______quantity. The rate of reaction increases with ______in concentration of reactants. The blanks in the question corresponds to

Options

A. decrease, products, positive, increase
B. increase, reactants, negative, decrase
C. decrease, reactants, positive, increase
D. increase, porducts, positive, increase

Answer

To solve the question, we need to fill in the blanks based on our understanding of chemical kinetics.

1. **The minus sign in rate `= - (d[A])/(dt)` indicates the _______ in concentration of the ______ with time.**
- The minus sign indicates a decrease in concentration. Since we are discussing the rate of a reaction, it is specifically referring to the reactants. Therefore, the first blank will be "decrease" and the second blank will be "reactants".
- **Answer:** The minus sign in rate `= - (d[A])/(dt)` indicates the **decrease** in concentration of the **reactants** with time.

2. **The rate of a reaction is always _______ quantity.**
- The rate of a reaction is always expressed as a positive quantity, even though the change in concentration of reactants is negative. Thus, the blank should be filled with "positive".
- **Answer:** The rate of a reaction is always a **positive** quantity.

3. **The rate of reaction increases with ______ in concentration of reactants.**
- The rate of reaction typically increases with an increase in the concentration of reactants. Therefore, the blank should be filled with "increase".
- **Answer:** The rate of reaction increases with an **increase** in concentration of reactants.

### Final Answers:
1. The minus sign in rate `= - (d[A])/(dt)` indicates the **decrease** in concentration of the **reactants** with time.
2. The rate of a reaction is always a **positive** quantity.
3. The rate of reaction increases with an **increase** in concentration of reactants.