U1L6-8 Names, Symbols, Copper Cycle, Cons Mass

Unit 1 L6-8 Review

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U1L6 Chemical Names & Symbols

Definitions

Element: A unique substance that cannot be broken down into simpler substances through chemical processes. Elements serve as the building materials of all matter.

Compound: A pure substance that is a chemical combination of two or more elements in a fixed ratio.

Multiple Select

The first letter of an element’s symbol is always uppercase, and if there is a second letter it is always lowercase. Check ALL of the following that have only one type of element.

• H

• NaCl

• H₂O

• H₂

• Ca

Multiple Select

Which of the following are pure elements (contain only one type of element)?

• Na

• NaCl

• SO₂

• Xe

• CH₄

Compounds

Compound: A pure substance that is a chemical combination of two or more elements in a fixed ratio.

In the formula shown, there are three Elements; Cu, S, and O (elements have one upper case letter and sometimes one lower case letter). The subscript ₄ indicates there are 4 atoms of the element listed before the subscript (so 4 Oxygen atoms)

Multiple Select

Compounds contains 2 or more different elements. Which of the following are Compounds?

• H

• H₂

• H₂O

• H₂SO₄

Multiple Select

Check all of the following that are Compounds.

• CuO

• Zn

• NaOH

• O₂

• He

Multiple Choice

How many different Elements are present in a molecule of CuSO₄ ?

• 1

• 2

• 3

• 4

• 6

Multiple Choice

How many different ATOMS are present in a molecule of CuSO₄ ? (hint, now you need to consider the subscript 4)

• 1

• 2

• 3

• 4

• 6

Multiple Choice

The Chemical Formula of Sucrose (common Sugar) is C₁₂H₂₂O₁₁. How many different ELEMENTS are present in a molecule of sugar?

• 1

• 2

• 3

• 4

• 45

Multiple Choice

The Chemical Formula of Sucrose (common Sugar) is C₁₂H₂₂O₁₁. How many ATOMS are present in a molecule of sugar?

• 1

• 2

• 3

• 4

• 45

U1L6 Chemical Names & Symbols

Definitions

Phase: The physical form a substance is in, such as solid, liquid, or gas. Phase is greatly influenced by temperature. The phase is denoted by (s), (l), or (g).

Aqueous: A substance is aqueous when it is dissolved in water. An element of compound that is dissolved in water will have an (aq) next to the symbols.

Multiple Choice

Which of the following could be a picture of NaCl (aq)?

Multiple Choice

Which of the following could be a picture of NaCl (s)?

Multiple Choice

In the Copper Cycle Reactions, how should the formula for copper nitrate (shown in the picture), Cu(NO₃)_2, be written? The image shown is after water was added to the beaker which initially contained copper metal and nitric acid.

• Cu(NO₃)₂ (s)

• Cu(NO₃)₂ (l)

• Cu(NO₃)₂ (aq)

• Cu(NO₃)₂ (g)

Multiple Choice

If a coin made of 100% Copper is placed in water, how the chemical formula of Copper be written? Remember that (aq) is for when a substance is dissolved in water.

• Cu(s)

• Cu(l)

• Cu(aq)

• Cu(g)

Numbers in Chemical Reactions

The large numbers (blue arrow) indicate how many of that molecule are needed for the chemical reaction recipe. The small number (green arrow) indicate how many of the atom are in the formula for that molecule.

Multiple Choice

How many MOLECULES of Oxygen (O₂) are in 2 O₂ as shown? One molecule of O₂ contains 2 atoms.

• 1

• 2

• 3

• 4

Multiple Choice

How many ATOMS of the Element Oxygen (O) are in 2 O₂ as shown? One molecule of O₂ contains 2 atoms.

• 1

• 2

• 3

• 4

Multiple Choice

How many ATOMS of the Element Carbon (C) are in one molecule of methane, CH₄?

• 1

• 2

• 3

• 4

Multiple Choice

How many ATOMS of the Element Hydrogen (H) are in one molecule of methane, CH₄?

• 1

• 2

• 3

• 4

Law of Conservation of Mass

Mass cannot be gained or lost in a chemical reaction.   The mass of compounds on one side of a chemical reaction = the mass of compounds on the other side.

Multiple Choice

If 17.5 grams combined of CH₄ and O₂ react completely to form CO₂ and H₂O, what is the combined mass of the CO₂ and H₂O that is produced?

• 35 grams

• 17.5 grams

• 17.5 liters

• 1.75 kg

Multiple Choice

In the Copper Cycle reaction that we watched in class, the mass of solid copper at the start was 0.498 grams and at the end was 0.295 grams. If every reaction went to completion and everything was separated perfectly at each step, how much copper should there have been at the end?

• 0.295 g

• .996 g

• 0.498 g

• 0 g

Multiple Choice

In the Copper Cycle reaction that we watched in class, the first step involved the reaction Cu(s) + 4 HNO3(aq). Which of the following lists shows elements that could be present in the gas that was generated? Hint: to be present at the end they need to be present at the start....

• Na, S, O

• Cu, S, H, Zn

• Cl, H, O, C

• H, N, O

Review Questions

From U1L4-5 Mass, Volume, Density

Multiple Select

Which of the following are units of mass?

• grams

• mL

• cm^3

• kg

• g / mL

Multiple Choice

An old thermostat broke and spilled 2 mL of Mercury. What is the density of Mercury if the amount spilled was 28 grams?

D = m/V

• 56 kg / cm³

• 30 mL

• 56 mL / g

• 14 g / mL

Units of Mass = grams (g)

You can also use the metric prefixes, like kilo for kilogram (kg) and milli for milligram (mg).

1000 mg = 1 g

1000 g = 1 kg

Multiple Select

Which of the following are units of volume?

• grams

• mL

• cm³

• Ohms

• Liters

Units of Volume = cm³ or Liters (L)

Often the metric prefixe milli is used, for milliliters (mL)

1000 mL = 1 L

1 cm³ = 1 mL

Multiple Select

Which of the two answers below has units of volume?

• 10 g

• 18 cm

• 8 mL

• 18 cm³

• 8 g / mL

Density

The mass of a substance per unit volume (unit volume = one volume unit, like 1 mL)

The density of any given substance is always the same (as long as the temperature remains constant), regardless of how much of the substance there is.

D = m/V

D = density, m = mass, V = volume. 

Density is usually reported in g/cm3 or g/mL.

Density Triangle

To help remember the density formula. Cover up the value that you want to find.

D = density (g/cm3 or g/mL)

m = mass (g)

V = volume (mL)

Multiple Select

Which of the two items below has units of density, (mass / volume)?

• 6 g / cm³

• 12 g

• 4 g / mL

• 0.25 mL / g

• 3 mL / g

Multiple Choice

What is the density of a material with a mass of 12 grams and a volume of 3 mL?

D = m / V

• 6 g / cm³

• 12 g

• 4 g / mL

• 0.25 mL / g

• 3 mL / g

Multiple Choice

What is the density of a cube of copper with a mass of 80 grams and dimensions of 2 cm x 2 cm x 2 cm ?

• 8 g / cm³

• 9 cm³

• 10 g / cm³

• 12 g / cm³