practice:
1. describe the uses of the following safety equipment: eye wash, chemical/safety shower, fire blanket, and fire extinguisher.
2. describe the appropriate way to smell an unknown substance in lab.
4. the following data was collected for a runner’s speed: 4 mi/hr, 3 mi/hr, 6.9 mi/hr, and 7 mi/hr.
a. is this data precise? explain.
b. if the runner tends to run 5 mi/hr, is this data an accurate representation of the runner’s ability? explain.
5. convert the following values:
a. 150 cm to mm
b. 1,200 ks to s
6. convert the following values:
a. 20°c to °f
b. 300 k to °c
c. 98°f to k
8. write the following values in scientific notation.
a. 787,000
b. 4,990,000
c. 0.0413
d. 0.00000011
9. write the following values in standard notation.
a. 6.9 x 10⁻³
b. 7.008 x 10⁶
c. 1.02 x 10²
d. 5.0553 x 10⁻⁴

Question

practice:
1. describe the uses of the following safety equipment: eye wash, chemical/safety shower, fire blanket, and fire extinguisher.
2. describe the appropriate way to smell an unknown substance in lab.
4. the following data was collected for a runner’s speed: 4 mi/hr, 3 mi/hr, 6.9 mi/hr, and 7 mi/hr.
   a. is this data precise? explain.
   b. if the runner tends to run 5 mi/hr, is this data an accurate representation of the runner’s ability? explain.
5. convert the following values:
   a. 150 cm to mm
   b. 1,200 ks to s
6. convert the following values:
   a. 20°c to °f
   b. 300 k to °c
   c. 98°f to k
8. write the following values in scientific notation.
   a. 787,000
   b. 4,990,000
   c. 0.0413
   d. 0.00000011
9. write the following values in standard notation.
   a. 6.9 x 10⁻³
   b. 7.008 x 10⁶
   c. 1.02 x 10²
   d. 5.0553 x 10⁻⁴

Accepted Answer

### Question 1
# Brief Explanations:
- **Eye wash**: Used to flush eyes when exposed to chemicals or contaminants to prevent injury.
- **Chemical/safety shower**: Used to rinse the entire body if splashed with hazardous chemicals.
- **Fire blanket**: Used to smother small fires or wrap around a person on fire to extinguish flames.
- **Fire extinguisher**: Used to put out small fires by discharging substances to remove fire elements (heat, oxygen, fuel).
# Answer:
- Eye wash: Flush eyes with contaminants.
- Chemical/safety shower: Rinse body with hazardous chemicals.
- Fire blanket: Smother small fires/cover burning person.
- Fire extinguisher: Extinguish small fires.

### Question 2
# Brief Explanations:
To smell an unknown substance in the lab, use the "wafting" technique. Hold the container at arm's length, gently wave your hand over the opening to direct a small amount of vapor toward your nose, and inhale lightly. Do not put your nose directly over the container.
# Answer:
Use the wafting technique: hold the container at arm's length, wave your hand over the opening to direct vapor toward your nose, and inhale lightly (do not put your nose over the container).

### Question 4a
# Brief Explanations:
Precision refers to the closeness of measured values to each other. The runner's speeds are 4 mi/hr, 3 mi/hr, 6.9 mi/hr, and 7 mi/hr. These values have a relatively large spread (3 to 7 mi/hr, with 6.9 close to 7 but 3 and 4 far from 6.9/7). So the data is not precise because the values are not close to one another.
# Answer:
No, the data is not precise. The speeds (3, 4, 6.9, 7 mi/hr) have a large spread and are not close to each other.

### Question 4b
# Brief Explanations:
Accuracy refers to how close a measured value is to the true value (here, 5 mi/hr). The speeds are 3, 4, 6.9, 7 mi/hr. 3 and 4 are below 5, 6.9 and 7 are above 5. The values are not close to 5 (the true speed the runner tends to have), so the data is not an accurate representation.
# Answer:
No, the data is not accurate. The speeds (3, 4, 6.9, 7 mi/hr) are not close to the true speed of 5 mi/hr.

### Question 5a
# Explanation:
## Step1: Recall the conversion factor (1 cm = 10 mm)
To convert centimeters to millimeters, multiply by 10.
## Step2: Apply the conversion
$150\ 	ext{cm} 	imes \frac{10\ 	ext{mm}}{1\ 	ext{cm}} = 1500\ 	ext{mm}$
# Answer:
1500 mm

### Question 5b
# Explanation:
## Step1: Recall the conversion factor (1 ks = 1000 s)
To convert kiloseconds to seconds, multiply by 1000.
## Step2: Apply the conversion
$1200\ 	ext{ks} 	imes \frac{1000\ 	ext{s}}{1\ 	ext{ks}} = 1200000\ 	ext{s}$
# Answer:
1200000 s

### Question 6a
# Explanation:
## Step1: Recall the formula for converting °C to °F: $°F = \frac{9}{5}°C + 32$
## Step2: Substitute $°C = 20$ into the formula
$°F = \frac{9}{5}(20) + 32 = 36 + 32 = 68$
# Answer:
$68^\circ	ext{F}$

### Question 6b
# Explanation:
## Step1: Recall the formula for converting K to °C: $°C = K - 273.15$
## Step2: Substitute $K = 300$ into the formula
$°C = 300 - 273.15 = 26.85$ (or 27 if using 273 for approximation)
# Answer:
$26.85^\circ	ext{C}$ (or $27^\circ	ext{C}$)

### Question 6c
# Explanation:
## Step1: First convert °F to °C using $°C = \frac{5}{9}(°F - 32)$, then convert °C to K using $K = °C + 273.15$
## Step2: Convert 98°F to °C: $°C = \frac{5}{9}(98 - 32) = \frac{5}{9}(66) = 36.67^\circ	ext{C}$ (approx)
## Step3: Convert °C to K: $K = 36.67 + 273.15 = 309.82\ 	ext{K}$ (approx)
# Answer:
$309.82\ 	ext{K}$ (or $310\ 	ext{K}$)

### Question 8a
# Explanation:
## Step1: Recall scientific notation: $a 	imes 10^n$, where $1 \leq a < 10$ and $n$ is an integer.
## Step2: For 787000, move the decimal to get $a = 7.87$, and count the moves (5 places left), so $n = 5$.
## Step3: Write as $7.87 	imes 10^5$
# Answer:
$7.87 	imes 10^5$

### Question 8b
# Explanation:
## Step1: For 4990000, move the decimal to get $a = 4.99$, and count the moves (6 places left), so $n = 6$.
## Step2: Write as $4.99 	imes 10^6$
# Answer:
$4.99 	imes 10^6$

### Question 8c
# Explanation:
## Step1: For 0.0413, move the decimal to get $a = 4.13$, and count the moves (2 places right), so $n = -2$.
## Step2: Write as $4.13 	imes 10^{-2}$
# Answer:
$4.13 	imes 10^{-2}$

### Question 8d
# Explanation:
## Step1: For 0.00000011, move the decimal to get $a = 1.1$, and count the moves (7 places right), so $n = -7$.
## Step2: Write as $1.1 	imes 10^{-7}$
# Answer:
$1.1 	imes 10^{-7}$

### Question 9a
# Explanation:
## Step1: Recall standard notation: convert $6.9 	imes 10^{-3}$ by moving the decimal 3 places left (since exponent is -3).
## Step2: $6.9 	imes 10^{-3} = 0.0069$
# Answer:
0.0069

### Question 9b
# Explanation:
## Step1: For $7.008 	imes 10^6$, move the decimal 6 places right (since exponent is 6).
## Step2: $7.008 	imes 10^6 = 7008000$
# Answer:
7008000

### Question 9c
# Explanation:
## Step1: For $1.02 	imes 10^2$, move the decimal 2 places right (since exponent is 2).
## Step2: $1.02 	imes 10^2 = 102$
# Answer:
102

### Question 9d
# Explanation:
## Step1: For $5.0553 	imes 10^{-4}$, move the decimal 4 places left (since exponent is -4).
## Step2: $5.0553 	imes 10^{-4} = 0.00050553$
# Answer:
0.00050553

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