Q: A student needs to convert $$5.00$$ days to seconds. Which is the correct calculation?

$$5.00\ \mathrm{days} \times \frac{24\ \mathrm{hr}}{1\ \mathrm{day}} \times \frac{60\ \mathrm{min}}{1\ \mathrm{hr}} \times \frac{60\ \mathrm{s}}{1\ \mathrm{min}}$$

Question 1

Which of the following best describes a compound?

Accepted Answer

A substance composed of two or more elements in a fixed ratio that can be decomposed into simpler substances.

Question 2

Which separation technique would be most appropriate to separate a mixture of sand and sugar?

Accepted Answer

Filtration

Question 3

A scientist observes a metal that is white, lustrous, melts at 649 °C, and reacts with chlorine to form a brittle white solid. Which of these observations describes a chemical property?

Accepted Answer

Reacts with chlorine to form a brittle white solid

Question 4

Which of the following is an example of an intensive property?

Accepted Answer

Density

Question 5

A cube of osmium metal has sides of 1.500 cm and a mass of 76.31 g at 25 °C. What is its density in g/cm$$^3 at $$this temperature?

Accepted Answer

$$22.59\ \mathrm{g/cm^3$}$$

Question 6

Which of the following changes is a chemical change?

Accepted Answer

Iron rusting

Question 7

Convert $$72\ ^\circ\mathrm{F} to $$Celsius.

Accepted Answer

$$22.2\ ^\circ\mathrm{C}$$

Question 8

Which of the following statements about significant figures is correct?

Accepted Answer

Zeros at the end of a number are significant only if the number contains a decimal point.

Question 9

A student measures the mass of a dime as 2.2405 g. How many significant figures are in this measurement?

Accepted Answer

5

Question 10

Which of the following is a correct conversion factor for changing inches to centimeters?

Accepted Answer

$$1\ \mathrm{in} = 2.54\ \mathrm{cm}$$

Question 11

Which of the following is a homogeneous mixture?

Accepted Answer

Air

Question 12

Which equation correctly relates Celsius and Kelvin temperatures?

Accepted Answer

$$K = ^\circ\mathrm{C} + 273.15$$

Question 13

A sample of titanium metal has a density of $$4.51\ \mathrm{g/cm^3$} at$$ $$25\ ^\circ\mathrm{C}. $$What mass of titanium will displace $$125.0\ \mathrm{mL} of $$water at $$25\ ^\circ\mathrm{C}$$?

Accepted Answer

$$564\ \mathrm{g}$$

Question 14

Which of the following is NOT a base SI unit?

Accepted Answer

Gram

Question 15

Which of the following best describes the Law of Constant Composition?

Accepted Answer

The relative number of atoms of each element in a compound is the same in any sample.

Question 16

Which of the following is the correct formula for kinetic energy?

Accepted Answer

$$KE = \frac{1}{2}mv^2$

Question 17

A student needs to convert $$5.00$$ days to seconds. Which is the correct calculation?

Accepted Answer

$$5.00\ \mathrm{days} 	imes \frac{24\ \mathrm{hr}}{1\ \mathrm{day}} 	imes \frac{60\ \mathrm{min}}{1\ \mathrm{hr}} 	imes \frac{60\ \mathrm{s}}{1\ \mathrm{min}}$$

Question 18

Which of the following is a physical change?

Accepted Answer

Evaporation of water

Question 19

Which of the following is the correct equation for converting Celsius to Fahrenheit?

Accepted Answer

$$^\circ\mathrm{F} = \frac{9}{5}(^\circ\mathrm{C}) + 32$$

General Chemistry I (CHEM 1210) Syllabus and Course Overview

스터디 가이드 - 연습 문제

학습 가이드 - 플래시카드