22. batches of seeds are soaked in salt solutions for different concentrations and germination is counted for each batch.
a. independent variable:
b. dependent variable:

23. an investigator hypothesizes that the adult weight of a dog is higher when it has fewer littermates.
a. independent variable:
b. dependent variable:

24. guinea pigs are kept at different temperatures for 6 weeks. percent weight gain is recorded.
a. independent variable:
b. dependent variable:

25. an object has a mass of 35.0 grams. on anthony’s balance, it weighs 36.85 grams. what is the percent error of his balance?

26. how many of the zeros in the measurement 0.000040200 m are significant?

27. a student measures a volume as 25ml, whereas the correct volume is 23 ml. what is the percent error?

28. true or false - mass and volume are the same.
29. true or false -the mass of an object will be the same throughout the universe.
30. true or false - the less mass an object has, the greater its inertia and the more force it takes to change its state of motion.
31. true or false - the weight of an object can change, in space you maybe weightless but not massless
32. true or false- derived units are produced by multiplying or dividing standard units.
33. true or false – the weight if an object changes with its location.
34. true or false – the density of a substance decreases as its temperature increase.

Question

22. batches of seeds are soaked in salt solutions for different concentrations and germination is counted for each batch.
    a. independent variable:
    b. dependent variable:

23. an investigator hypothesizes that the adult weight of a dog is higher when it has fewer littermates.
    a. independent variable:
    b. dependent variable:

24. guinea pigs are kept at different temperatures for 6 weeks. percent weight gain is recorded.
    a. independent variable:
    b. dependent variable:

25. an object has a mass of 35.0 grams. on anthony’s balance, it weighs 36.85 grams. what is the percent error of his balance?

26. how many of the zeros in the measurement 0.000040200 m are significant?

27. a student measures a volume as 25ml, whereas the correct volume is 23 ml. what is the percent error?

28. true or false - mass and volume are the same.
29. true or false -the mass of an object will be the same throughout the universe.
30. true or false - the less mass an object has, the greater its inertia and the more force it takes to change its state of motion.
31. true or false - the weight of an object can change, in space you maybe weightless but not massless
32. true or false- derived units are produced by multiplying or dividing standard units.
33. true or false – the weight if an object changes with its location.
34. true or false – the density of a substance decreases as its temperature increase.

Accepted Answer

### 22.
# Explanation:
## Step1: Identify independent variable
The variable that is changed is salt - solution concentration.
## Step2: Identify dependent variable
The variable that is measured (affected by the independent variable) is germination count.
# Answer:
a. Salt - solution concentration
b. Germination count

### 23.
# Explanation:
## Step1: Identify independent variable
The variable that is thought to affect another is the number of litter - mates.
## Step2: Identify dependent variable
The variable being measured is the adult weight of a dog.
# Answer:
a. Number of litter - mates
b. Adult weight of a dog

### 24.
# Explanation:
## Step1: Identify independent variable
The variable that is manipulated is the temperature.
## Step2: Identify dependent variable
The variable that is measured is the percent weight gain.
# Answer:
a. Temperature
b. Percent weight gain

### 25.
# Explanation:
## Step1: Recall percent - error formula
The percent - error formula is $	ext{Percent Error}=\frac{\vert	ext{Experimental Value}-	ext{True Value}\vert}{	ext{True Value}}	imes100\%$.
## Step2: Substitute values
Experimental value = 36.85 g, True value = 35.0 g. $	ext{Percent Error}=\frac{\vert36.85 - 35.0\vert}{35.0}	imes100\%=\frac{1.85}{35.0}	imes100\%\approx5.29\%$.
# Answer:
Approximately 5.29%

### 26.
# Explanation:
## Step1: Recall significant - zero rules
Leading zeros (zeros before non - zero digits) are not significant. Captive zeros (zeros between non - zero digits) are significant. Trailing zeros (zeros after non - zero digits) are significant if there is a decimal point. In 0.000040200 m, the significant zeros are the two zeros between 4 and 2 and the two trailing zeros. So there are 4 significant zeros.
# Answer:
4

### 27.
# Explanation:
## Step1: Use percent - error formula
$	ext{Percent Error}=\frac{\vert	ext{Experimental Value}-	ext{True Value}\vert}{	ext{True Value}}	imes100\%$. Experimental value = 25 ml, True value = 23 ml. $	ext{Percent Error}=\frac{\vert25 - 23\vert}{23}	imes100\%=\frac{2}{23}	imes100\%\approx8.70\%$.
# Answer:
Approximately 8.70%

### 28.
# Explanation:
Mass is the amount of matter in an object, and volume is the amount of space an object occupies. They are different physical quantities.
# Answer:
False

### 29.
# Explanation:
Mass is a measure of inertia. The more mass an object has, the greater its inertia and the more force it takes to change its state of motion.
# Answer:
False

### 30.
# Explanation:
Inertia is directly proportional to mass. The less mass an object has, the less its inertia and the less force it takes to change its state of motion.
# Answer:
False

### 31.
# Explanation:
Weight is the force due to gravity ($W = mg$), which can change depending on the gravitational field. Mass is a fundamental property of an object and does not change in space.
# Answer:
True

### 32.
# Explanation:
Derived units are combinations of base (standard) units obtained by multiplication or division. For example, speed = distance/time, where distance has the base - unit of meter and time has the base - unit of second, and speed has the derived unit of m/s.
# Answer:
True

### 33.
# Explanation:
Weight ($W=mg$) depends on the gravitational acceleration ($g$), which can vary with location (e.g., $g$ on the moon is different from $g$ on Earth).
# Answer:
True

### 34.
# Explanation:
For most substances, as temperature increases, the volume of the substance increases (thermal expansion), and since density $
ho=\frac{m}{V}$, with mass ($m$) constant, an increase in volume ($V$) leads to a decrease in density.
# Answer:
True

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QUESTION IMAGE

Question

Explanation:

22.

Step1: Identify independent variable

Step2: Identify dependent variable

Step1: Identify independent variable

Step2: Identify dependent variable

Step1: Identify independent variable

Step2: Identify dependent variable

Answer:

23.