1. Intro to General Chemistry

Density

What is density?

A new penny has a mass of 2.49 g and a volume of 0.349 cm3.
Is the penny made of pure copper? Explain your answer.

Acetone (nail polish remover) has a density of 0.7857 g>cm3. 
a. What is the mass in g of 28.56 mL of acetone? 
b. What is the volume in mL of 6.54 g of acetone?

Answer the following questions.
(c) A certain type of wood has a density of 0.40 g/cm3. What is the mass of 1.0 cord of this wood in kg, where 1 cord is 128 cubic feet of wood

(b) Carbon dioxide 1CO22 is a gas at room temperature and
pressure. However, carbon dioxide can be put under pressure to
become a “supercritical fluid” that is a much safer dry-cleaning
agent than tetrachloroethylene. At a certain pressure, the density
of supercritical CO2 is 0.469 g>cm3. What is the mass of a
25.0-mL sample of supercritical CO2 at this pressure?

volume = mass/density = 0.25 g/ (3.12 g/ cm3)

Density is an intensive property and is the ratio of mass to volume; 1 mL = 1 cm3

How many mL of bromine are required to deliver 0.25 g of bromine into a reaction? (dBr = 3.12 g/cm3)

Chemistry Basics | classification and properties of matter, density

More sulfuric acid (density = 1.8302 g/cm3) is produced than any other chemical—approximately 3.6 * 1011 lb/yr world-wide. What is the volume of this amount in liters?

5 Facts about Density

Density - Why does oil float on water? | #aumsum #kids #science #education #children

The density of chloroform, a widely used organic solvent, is 1.4832 g/mL at 20 °C. How many milliliters would you use if you wanted 112.5 g of chloroform?

When lead levels in blood exceed 0.80 ppm (parts per million) the level is considered dangerous. 0.80 ppm means that 1 million g of blood would contain 0.80 g of Pb. Given that the density of blood is 1.060 kg/cm3, how many grams of Pb would be found in 400.00 mL of blood at 0.620 ppm?

The density of titanium is 4.51 g>cm3. What is the volume (in
cubic inches) of 3.5 lb of titanium?

What is Density?

A calibrated flask was filled to the 25.00 mL mark with ethyl alcohol. By weighing the flask before and after add-ing the alcohol, it was determined that the flask contained 19.7325 g of alcohol. In a second experiment, 25.0920 g of metal beads were added to the flask, and the flask was again filled to the 25.00 mL mark with ethyl alcohol. The total mass of the metal plus alcohol in the flask was determined to be 38.4704 g. What is the density of the metal in g/mL?

A vessel contains 4.67 L of bromine whose density is 3.10 g/cm3. What is the mass of the bromine in the vessel (in kilograms)?

A flask containing 11.7 mL of a liquid weighs 132.8 g with the
liquid in the flask and 124.1 g when empty. Calculate the
density of the liquid in g>mL to the correct number of significant digits.

An iceberg has a volume of 7655 ft2. What is the mass of the ice
(in kg) composing the iceberg (at 0 °C)?

Density Example 1

What is the density of glass in g/cm3 if a sample weighing 27.43 g has a volume of 12.40 cm3?

Brainpop density

(b) Three cubes of equal mass are
composed of gold 1density = 19.32 g/cm32, platinum
1density = 21.45 g/cm32, and lead 1density = 11.35 g/cm32.
List the cubes from smallest to largest.

Ethylene glycol (antifreeze) has a density of 1.11 g>cm3.
a. What is the mass in g of 417 mL of ethylene glycol?
b. What is the volume in L of 4.1 kg of ethylene glycol?

The following cylinder contains three liquids that do not mix with one another: water (density = 1.0 g/mL), vegetable oil (density = 0.93 g/mL), and mercury (density = 13.5 g/mL). Which liquid is which?

(a) After the label fell off a bottle containing a clear liquid believed
to be benzene, a chemist measured the density of the
liquid to verify its identity. A 25.0-mL portion of the liquid
had a mass of 21.95 g. A chemistry handbook lists the density
of benzene at 15 C as 0.8787 g>mL. Is the calculated density
in agreement with the tabulated value?

Which block in each of the following drawings of a balance is more dense, red or green? Explain.

Gaseous hydrogen has a density of 0.0899 g/L at 0 °C, and gaseous chlorine has a density of 3.214 g/L at the same tem-perature. How many liters of each would you need if you wanted 1.0078 g of hydrogen and 35.45 g of chlorine?

(a) A sample of tetrachloroethylene, a liquid used in dry cleaning
that is being phased out because of its potential to cause cancer,
has a mass of 40.55 g and a volume of 25.0 mL at 25 C. What
is its density at this temperature? Will tetrachloroethylene float
on water? (Materials that are less dense than water will float.)

Two spheres of equal volume are placed on the scales as
shown. Which one is more dense?
<img src="https://lightcat-files.s3.amazonaws.com/problem_images/d623fb857140bf98-1660294865493.jpg" alt="" />

What is the density of lead in g/cm3 if a sample weighing 206.77 g has a volume of 15.50 cm3?

What is Density? Made easy- Easy Science

Consider the two spheres shown here, one made of silver and
the other of aluminum. (a) What is the mass of each sphere
in kg?
<img src="https://lightcat-files.s3.amazonaws.com/problem_images/72cb688b2a5e6851-1676322202983.jpg" alt="" />

(b) An experiment
requires 45.0 g of ethylene glycol, a liquid whose density
is 1.114 g>mL. Rather than weigh the sample on a balance, a
chemist chooses to dispense the liquid using a graduated cylinder.
What volume of the liquid should he use?

Answer the following questions.
(d) A particular sample of crude oil has a density of 0.85 g/mL. What is the mass of 1.00 barrel of this crude oil in kg, where a barrel of oil is exactly 42 gallons?

Human fat has a density of 0.918 g>cm3. How much volume 
(in cm3) is gained by a person who gains 10.0 lb of pure fat? 
the reliability of a Measurement and Significant Figures

You are assigned the task of separating a desired granular material
with a density of 3.62 g>cm3 from an undesired granular
material that has a density of 2.04 g>cm3. You want to do
this by shaking the mixture in a liquid in which the heavier
material will fall to the bottom and the lighter material will
float. A solid will float on any liquid that is more dense. Using
an Internet-based source or a handbook of chemistry, find
the densities of the following substances: carbon tetrachloride,
hexane, benzene, and diiodomethane. Which of these
liquids will serve your purpose, assuming no chemical interaction
takes place between the liquid and the solids?

(b) An experiment
requires 15.0 g of cyclohexane, whose density at 25 C is
0.7781 g>mL. What volume of cyclohexane should be used?

Vinaigrette salad dressing consists mainly of oil and vinegar. The density of olive oil is 0.918 g/cm3, the density of vinegar is 1.006 g/cm3, and the two do not mix. If a certain mixture of olive oil and vinegar has a total mass of 397.8 g and a total volume of 422.8 cm3, what is the volume of oil and what is the volume of vinegar in the mixture?

A small airplane takes on 245 L of fuel. If the density of the fuel
is 0.821 g>mL, what mass of fuel has the airplane taken on?

Consider the two spheres shown here, one made of silver and
the other of aluminum. (a) What is the mass of each sphere
in kg?
<img src="https://lightcat-files.s3.amazonaws.com/problem_images/aa465760dc194243-1664212492603.jpg" alt="" />

Consider 20 mL samples of the following liquids. Which sample has the largest mass? (LO 1.9) 
(a) Water (density = 1.0 g/mL) 
(b) Glycerol (density = 1.26 g/mL) 
(c) Ethanol (density = 0.79 g/mL) 
(d) Acetic acid (density = 1.05 g/mL

When an irregularly shaped chunk of silicon weighing 8.763 g was placed in a graduated cylinder containing 25.00 mL of water, the water level in the cylinder rose to 28.76 mL. What is the density of silicon in g/cm3?

Glycerol is a syrupy liquid often used in cosmetics and soaps. A
3.25 L sample of pure glycerol has a mass of 4.10 * 103 g. What
is the density of glycerol in g>cm3?

The cylinder contains two liquids that do not mix with one another: water (density = 1.0 g/mL) and vegetable oil (density = 0.93 g/mL). Four different pieces of plastic are added to the cylinder. Which type of plastic is at the position indicated by the square object in the figure? (LO 1.10) 
(a) Polyvinyl chloride (density = 1.26 g/mL) 
(b) Polypropylene (density = 0.90 g/mL) 
(c) High-density polyethylene (density = 0.96 g/mL) 
(d) Polyethylene terephthalate (density = 1.38 g/mL)
<img src="https://lightcat-files.s3.amazonaws.com/problem_images/7555a4c3ac2cca8e-1667851838592.jpg" alt="" />

A bag of Hershey’s Kisses contains the following information: Serving size: 9 pieces = 41 g Calories per serving: 230 Total fat per serving: 13 g
(b) The density of a Hershey’s Kiss is 1.4 g/mL. What is the volume of a single Hershey’s Kiss?

Water has a density of 0.997 g>cm3 at 25 C; ice has a density
of 0.917 g>cm3 at -10 C. (a) If a soft-drink bottle whose volume
is 1.50 L is completely filled with water and then frozen
to -10 C, what volume does the ice occupy? (b) Can the ice
be contained within the bottle?

The density of air at ordinary atmospheric pressure and
25 C is 1.19 g/L. What is the mass, in kilograms, of the air in
a room that measures 4.5 m * 5.0 m * 2.5 m?

Aspirin has a density of 1.40 g/cm3. What is the volume in cubic centimeters of an aspirin tablet weighing 250 mg? Of a tablet weighing 500 lb?

Gold is alloyed (mixed) with other metals to increase its
hardness in making jewelry. (b) The relative amount of gold in an alloy is
commonly expressed in units of carats. Pure gold is 24 carat,
and the percentage of gold in an alloy is given as a percentage
of this value. For example, an alloy that is 50% gold is
12 carat. State the purity of the gold jewelry in carats.

(a) To identify a liquid substance, a student determined its
density. Using a graduated cylinder, she measured out a 45-mL
sample of the substance. She then measured the mass of the
sample, finding that it weighed 38.5 g. She knew that the substance
had to be either isopropyl alcohol 1density 0.785 g>mL2
or toluene 1density 0.866 g>mL2. What are the calculated density
and the probable identity of the substance?

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2. Atoms & Elements

3. Chemical Reactions

4. BONUS: Lab Techniques and Procedures

5. BONUS: Mathematical Operations and Functions

6. Chemical Quantities & Aqueous Reactions

7. Gases

8. Thermochemistry

9. Quantum Mechanics

10. Periodic Properties of the Elements

11. Bonding & Molecular Structure

12. Molecular Shapes & Valence Bond Theory

13. Liquids, Solids & Intermolecular Forces

14. Solutions

15. Chemical Kinetics

16. Chemical Equilibrium

17. Acid and Base Equilibrium

18. Aqueous Equilibrium

19. Chemical Thermodynamics

20. Electrochemistry

21. Nuclear Chemistry

22. Organic Chemistry

23. Chemistry of the Nonmetals

24. Transition Metals and Coordination Compounds

[BOOK CHEM] Clutch Version

SI Units

The International System of Units (SI) is related to the metric system and is based on seven base units.

Physical & Chemical Changes

A physical change involves a change in the phases of matter, whereas a chemical change involves a change in chemical bonds.&nbsp;

Physical Properties

Physical Properties are measurable properties that describe the state of chemical compounds.&nbsp;

Significant Figures: In Calculations

Significant Figures are often involved in chemical calculations.&nbsp;

Scientific Notation

Scientific Notation is used to turn small or large inconvenient numbers into manageable ones.&nbsp;

Density of Non-Geometric Objects

The density of non-geometric objects can be determined using water displacement.&nbsp;

Density represents the mass of an object or compound within a given volume.&nbsp;

Significant Figures: Precision in Measurements

Significant Figures are used to discuss the level of precision in any measurement.&nbsp;

Intensive vs. Extensive Properties

Intensive Properties are independent and Extensive Properties are dependent on the size or amount of substance present

Density of Geometric Objects

The density of geometric objects generally includes spheres, cubes and cylinders.&nbsp;

Significant Figures

Significant Figures are used to determine some level of accuracy within our recorded measurements.&nbsp;

Dimensional Analysis

We use dimensional analysis&nbsp;as a fail proof process to convert from one unit to another.

Chemical Properties

Chemical Properties are observed during chemical reactions.&nbsp;

Temperature

Temperature is a measure of the amount of average kinetic energy of the atoms in a compound.

Metric Prefixes

Metric Prefixes are “labels” that can be placed in front of base units.&nbsp;

Conversion Factors

Conversion Factors represent ratios or fractions composed of different units.&nbsp;

Classification of Matter

Chemistry is the study of matter and the changes it undergoes, with the atom being its basic functional unit.&nbsp;