Q: Given a 5 M stock solution of NaCl, how much stock solution is needed to make 200 mL of 0.1 M NaCl?

$V_1 = \frac{C_2 V_2}{C_1} = \frac{0.1 \times 200}{5} = 4$ mL

Question 1

In the hair growth experiment comparing Placebo, HairMagic, and YetiMaker, what is the independent variable?

Accepted Answer

The type of drug administered (Placebo, HairMagic, YetiMaker)

Question 2

Which of the following best describes a negative control in a scientific experiment?

Accepted Answer

A group that receives no treatment or a placebo

Question 3

Convert 5 kilometers to meters using the correct equation.

Accepted Answer

$5 	imes 10^3 = 5000$ meters

Question 4

A cell containing 80% NaCl is placed in a beaker containing 90% NaCl. In which direction will water move?

Accepted Answer

Out of the cell

Question 5

Given a 5 M stock solution of NaCl, how much stock solution is needed to make 200 mL of 0.1 M NaCl?

Accepted Answer

$V_1 = \frac{C_2 V_2}{C_1} = \frac{0.1 	imes 200}{5} = 4$ mL

Question 6

A potato is placed in a 0.5 M NaCl solution and its mass decreases over time. What does this indicate about the solution relative to the potato?

Accepted Answer

The solution is hypertonic to the potato

Question 7

Write 56,000,000 in scientific notation.

Accepted Answer

$5.6 	imes 10^7$

Question 8

Which pipette would you use to accurately measure 85 $\mu$L?

Accepted Answer

P200

Question 9

In an enzyme assay, absorbance at 540 nm is measured to detect maltose. What is the relationship between absorbance and maltose concentration?

Accepted Answer

Absorbance increases as maltose concentration increases

Question 10

What is the equation for photosynthesis?

Accepted Answer

$6CO_2 + 6H_2O \rightarrow C_6H_{12}O_6 + 6O_2$

Question 11

Using the absorbance spectrum, which wavelengths of light are absorbed the most by chlorophyll?

Accepted Answer

Blue (around 450 nm) and red (around 680 nm)

Question 12

A potato in 0 M NaCl solution increases in mass. What does this indicate about the solution?

Accepted Answer

The solution is hypotonic to the potato

Question 13

If the rate of percentage change in mass for a potato in 0.3 M NaCl is zero, what does this indicate?

Accepted Answer

The solution is isotonic to the potato

Question 14

What is the $R_f$ value for Pigment A if the solvent front is at 10 cm and Pigment A is at 8 cm?

Accepted Answer

$R_f = \frac{8}{10} = 0.8$

Question 15

During dialysis, if a cell shrinks when placed in a solution, what does this tell you about the tonicity of the solution?

Accepted Answer

The solution is hypertonic to the cell

Question 16

In an enzyme assay, the optimal temperature is determined by the highest absorbance at 540 nm. If the highest absorbance is at 45°C, what does this indicate?

Accepted Answer

The enzyme is most active at 45°C

Question 17

If a solution outside a cell is hypotonic compared to the inside, what will happen to the cell?

Accepted Answer

The cell will swell

Question 18

Which of the following is a real-life application of using scientific controls in experiments?

Accepted Answer

Testing a new drug by comparing results to a placebo group

Question 19

If the absorbance at 540 nm for a sample is 0.211, and the standard curve equation is $y = 0.05x$, what is the concentration of maltose in mg/mL?

Accepted Answer

$x = \frac{0.211}{0.05} = 4.22$ mg/mL

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