Q: Which of the following is the correct conversion factor to change yards to meters?

$$1 \text{ yard} = 0.9144 \text{ m}$$

Q: Which of the following is the correct formula for calculating percent yield?

$$\text{percent yield} = \frac{\text{actual yield}}{\text{theoretical yield}} \times 100$$

Question 1

Which of the following states of matter has the weakest attraction between its particles?

Accepted Answer

Gas

Question 2

A diamond requires high pressure and temperatures of about 2273°F to form. Convert this temperature to Kelvin using the formula $$K = ^\circ F 	imes \frac{5}{9} + 255.37. $$What is the correct value?

Accepted Answer

$$1473 K$$

Question 3

Which of the following is a correct example of a homogeneous mixture?

Accepted Answer

Salt dissolved in water

Question 4

A sample of graphite has a mass of $$20.54 g. $$Using the correct number of significant figures, how should this value be reported?

Accepted Answer

$$20.54 g$$

Question 5

Which of the following elements is a diatomic molecule under standard conditions?

Accepted Answer

Nitrogen

Question 6

A cube of osmium has a mass of $$1.04 g $$and a density of $$22.6 g/cm$^3. $$What is its volume in cm$$^3$$? Use $$d = \frac{m}{V}.$$

Accepted Answer

$$0.046 cm$^3$$

Question 7

Which of the following is NOT true about an ion?

Accepted Answer

It has the same number of electrons as a neutral atom

Question 8

Which of the following best describes a pure substance?

Accepted Answer

A material with a fixed composition and distinct properties

Question 9

Which of the following pairs of isotopes have the same number of protons but different numbers of neutrons?

Accepted Answer

$$^{12}C$^{6}$$ $$and ^{14}C$^{6}$

Question 10

Which of the following is the correct scientific notation for the number $$6,210,000$$?

Accepted Answer

$$6.21 	imes 10^6$

Question 11

A student calculates $$13.312 + 2.00 on $$their calculator. How should the answer be reported using correct significant figures?

Accepted Answer

$$15.32$$

Question 12

Which of the following best explains why gases are compressible while solids are not?

Accepted Answer

Gas particles are much farther apart than solid particles

Question 13

Which of the following is the correct conversion factor to change yards to meters?

Accepted Answer

$$1 	ext{ yard} = 0.9144 	ext{ m}$$

Question 14

Which of the following elements has the highest atomic number?

Accepted Answer

Lawrencium

Question 15

A neutral atom of sodium ($$^{23}Na) $$has how many protons and electrons?

Accepted Answer

11 protons and 11 electrons

Question 16

Which of the following is the correct formula for calculating percent yield?

Accepted Answer

$$	ext{percent yield} = \frac{	ext{actual yield}}{	ext{theoretical yield}} 	imes 100$$

Question 17

Which of the following is a heterogeneous mixture?

Accepted Answer

Blood

Question 18

Which of the following statements about isotopes is correct?

Accepted Answer

Isotopes have the same number of protons but different numbers of neutrons

Question 19

Which of the following is the correct formula for energy of a photon?

Accepted Answer

$$E = h 
u$$

Question 20

Which of the following elements is most likely to form a $$2^+$$ ion?

Accepted Answer

Magnesium

General Chemistry Exam 1 Study Guide: Matter, Measurement, and Atomic Structure

Guida di studio - Domande di pratica

Study guide - Flashcard