Q: Which of the following is the correct formula for calculating heat absorbed or released by a substance?

$$q = m \times c \times \Delta T$$

Question 1

Which of the following statements best describes the difference between accuracy and precision in scientific measurements?

Accepted Answer

Accuracy refers to how close measurements are to the true value, while precision refers to how close measurements are to each other.

Question 2

A nurse needs to administer 0.250 grams of a medication, but the tablets are labeled in milligrams. How many milligrams should the nurse give?

Accepted Answer

$$250\ \mathrm{mg}$$

Question 3

Which of the following is an example of a chemical change?

Accepted Answer

Burning a piece of paper

Question 4

Which of the following is the correct symbol for the element with the name 'Sodium'?

Accepted Answer

Na

Question 5

A sample of gold has a mass of $$96.5\ \mathrm{g}$$ and a volume of $$5.00\ \mathrm{cm}^3. $$What is the density of gold in $$\mathrm{g/cm}^3$$?

Accepted Answer

$$19.3\ \mathrm{g/cm}^3$$

Question 6

Which of the following is a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 7

Convert $$37.0\ ^\circ\mathrm{C} ($$normal human body temperature) to Kelvin.

Accepted Answer

$$310.2\ \mathrm{K}$$

Question 8

Which of the following is NOT a base SI unit?

Accepted Answer

Gram

Question 9

A student records the following measurements: $$2.50\ \mathrm{cm}$$, $$2.55\ \mathrm{cm}$$, $$2.53\ \mathrm{cm}$$, and $$2.54\ \mathrm{cm}. $$The true value is $$2.00\ \mathrm{cm}. $$Which statement best describes these measurements?

Accepted Answer

They are precise but not accurate.

Question 10

Which of the following is the correct formula for calculating heat absorbed or released by a substance?

Accepted Answer

$$q = m 	imes c 	imes \Delta T$$

Question 11

A patient’s temperature rises from $$36.5\ ^\circ\mathrm{C} to$$ $$39.0\ ^\circ\mathrm{C}. $$What is the temperature change in Kelvin?

Accepted Answer

$$2.5\ \mathrm{K}$$

Question 12

Which of the following is an example of a pure substance?

Accepted Answer

Oxygen gas

Question 13

Which metric prefix represents $$10^{-6}$$?

Accepted Answer

Micro-

Question 14

A solution is prepared by dissolving $$5.00\ \mathrm{g} of $$glucose in $$100.0\ \mathrm{g} of $$water. Which term best describes this mixture?

Accepted Answer

Homogeneous mixture

Question 15

Which of the following is a physical property?

Accepted Answer

Boiling point

Question 16

A block of unknown metal has a mass of $$45.0\ \mathrm{g}$$ and displaces $$15.0\ \mathrm{mL} of $$water. What is the density of the metal?

Accepted Answer

$$3.00\ \mathrm{g/mL}$$

Question 17

Which of the following is NOT a sign of a chemical reaction?

Accepted Answer

A liquid boils

Question 18

Which of the following best describes the state of matter in which particles are far apart and move freely?

Accepted Answer

Gas

Question 19

Which of the following is the correct way to write the chemical formula for a compound containing two atoms of hydrogen and one atom of oxygen?

Accepted Answer

H$$_2O$$

Question 20

A laboratory procedure requires $$0.500\ \mathrm{L} of a $$solution. How many milliliters is this?

Accepted Answer

$$500\ \mathrm{mL}$$

CHM 120 Chapter 1: Matter and Measurements – Structured Study Notes

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