Question

name ______ class ______

1. what is the most important safety rule?

a. never work with chemicals.
b. always use unbreakable glassware.
c. always follow your teachers instructions and textbook directions exactly.
d. never do experiments that involve flames or hot objects.

1. how is 0.00025 written in scientific notation?

a. \\(25 \times 10^{-5}\\)
b. \\(2.5 \times 10^{4}\\)
c. \\(0.25 \times 10^{-3}\\)
d. \\(2.5 \times 10^{-4}\\)

1. which of the following is equal to 1 centimeter?

a. 100 meters
b. 1/10 of a millimeter
c. 10 millimeters
d. 100 millimeters

1. timers at a swim meet used four different clocks to time an event. which recorded time is the most precise?

a. 55 s
b. 55.0 s
c. 55.2 s
d. 55.25 s

1. on the celsius scale, at what temperature does water boil?

a. \\(0^{\circ}\\)
b. \\(212^{\circ}\\)
c. \\(100^{\circ}\\)
d. \\(32^{\circ}\\)

1. what is the relationship in which the ratio of the manipulated variable and the responding variable is constant?

a. inverse proportion
b. direct proportion
c. slope
d. interdependent

1. how do scientists communicate the results of investigations?

a. by publishing articles in scientific journals
b. by giving talks at scientific conferences
c. by exchanging e-mails
d. all of the above

1. what is a peer review?

a. a process in which only close friends of a scientist review the scientists work
b. a process in which scientists examine other scientists work
c. a process in which scientists copy other scientists work
d. a process in which scientists keep their work secret

Explanation:

Identify correct safety rule and scientific notation

$$ \text{Question 8: Following instructions is the most fundamental safety rule.} \implies \text{Option c} $$

$$ \text{Question 9: } 0.00025 = 2.5 \times 10^{-4} \implies \text{Option d} $$

Convert units and evaluate precision

$$ \text{Question 10: } 1\text{ cm} = 10\text{ mm} \implies \text{Option c} $$

$$ \text{Question 11: More decimal places indicate higher precision. } 55.25\text{ s has two decimal places.} \implies \text{Option d} $$

$$ \text{Question 12: Water boils at } 100^\circ\text{C on the Celsius scale.} \implies \text{Option c} $$

Analyze variables and scientific communication

$$ \text{Question 13: Constant ratio } \frac{y}{x} = k \implies y = kx \text{ (direct proportion).} \implies \text{Option b} $$

$$ \text{Question 14: Scientists use journals, conferences, and emails to communicate.} \implies \text{Option d} $$

$$ \text{Question 15: Peer review is the evaluation of work by other experts in the field.} \implies \text{Option b} $$

Answer:

Question 8

• a. Never work with chemicals.
• b. Always use unbreakable glassware.
• c. Always follow your teacher's instructions and textbook directions exactly. (Correct answer)
• d. Never do experiments that involve flames or hot objects.

Question 9

• a. \(25 \times 10^{-5}\)
• b. \(2.5 \times 10^{4}\)
• c. \(0.25 \times 10^{-3}\)
• d. \(2.5 \times 10^{-4}\) (Correct answer)

Question 10

• a. 100 meters
• b. 1/10 of a millimeter
• c. 10 millimeters (Correct answer)
• d. 100 millimeters

Question 11

• a. 55 s
• b. 55.0 s
• c. 55.2 s
• d. 55.25 s (Correct answer)

Question 12

• a. \(0^\circ\)
• b. \(212^\circ\)
• c. \(100^\circ\) (Correct answer)
• d. \(32^\circ\)

Question 13

• a. inverse proportion
• b. direct proportion (Correct answer)
• c. slope
• d. interdependent

Question 14

• a. by publishing articles in scientific journals
• b. by giving talks at scientific conferences
• c. by exchanging e-mails
• d. all of the above (Correct answer)

Question 15

• a. a process in which only close friends of a scientist review the scientist's work
• b. a process in which scientists examine other scientists' work (Correct answer)
• c. a process in which scientists copy other scientists' work
• d. a process in which scientists keep their work secret