Which of the following are exact numbers?

The budget deficit of the U.S. government in fiscal year 1990 was 269 billion.

Which of the following are exact numbers?

One yard is equal to 0.9144 m}$.

Which of the following are exact numbers?

The elevation of Breckenridge, Colorado, is 9600 ft$.

Why is the separation of mixtures into pure or relatively pure substances so important when performing a chemical analysis?

Distinguish between physical changes and chemical changes.

A student performed an analysis of a sample for its calcium content and got the following results:

$$14.92 \% \quad 14.91 \% \quad 14.88 \% \quad 14.91 \%$$

The actual amount of calcium in the sample is 15.70. What conclusion can you draw about the accuracy and precision of these results?

Use the following data to calculate the number of minutes in a month: 24 hours per day, 60 minutes per hour, 7 days per week, and 4 weeks per month.

There are 365 days per year, 24 hours per day, 12 months per year, and 60 minutes per hour. Use these data to determine how many minutes are in a month.

Which of the following statements (hypotheses) could be tested by quantitative measurement?

Rolaids consumes 47 times its weight in excess stomach

Which of the following statements (hypotheses) could be tested by quantitative measurement?

Ivory soap is $99 \frac{44}{100} \%$ pure.

Which of the following statements (hypotheses) could be tested by quantitative measurement?

Ty Cobb was a better hitter than Pete Rose.

Is the scientific method suitable for solving problems only in the sciences? Explain.

Define and explain the differences between the following terms.

hypothesis and theory

Define and explain the differences between the following terms.

theory and experiment