Ana silverman
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These connect homework questions are for the textbook "Chemistry in Context, Applying Chemistry to Society" 10th edition

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Chemistry Chapter 1 Connect Homework

Question 1 of 54

1

Which of the following options correctly describes atoms? Select all that apply.

Select one or more of the following:

  • An atom is the smallest unit of an element that can exist as a stable, independent entity

  • Atoms are extremely small

  • Compounds contain two or more different types of atoms

  • Atoms are divisible by ordinary chemical processes

  • Elements are made up of several types of atoms

Explanation

Question 2 of 54

1

Which of the following options correctly describe the periodic table? Select all that apply.

Select one or more of the following:

  • The horizontal rows in the periodic table are called groups

  • The elements in the periodic table are arranged based on similar chemical properties

  • The periodic table includes compounds as well as elements

  • The periodic table contained the chemical symbols that represent the elements

  • Elements found on the left side of the periodic table are called nonmetals

Explanation

Question 3 of 54

1

What group are Nobel gases apart of?

Select one or more of the following:

  • Group 1

  • Group 2

  • Group 17

  • Group 18

Explanation

Question 4 of 54

1

What group are halogens apart of?

Select one or more of the following:

  • Group 1

  • Group 2

  • Group 17

  • Group 18

Explanation

Question 5 of 54

1

What group are alkali metas apart of on the periodic table?

Select one or more of the following:

  • Group 1

  • Group 2

  • Group 17

  • Group 18

Explanation

Question 6 of 54

1

What group are alkaline earth metals apart of on the periodic table?

Select one or more of the following:

  • Group 1

  • Group 2

  • Group 17

  • Group 18

Explanation

Question 7 of 54

1

The number 10,000 can be expressed as 1 x 10^4. This second form is called ______ notation.

Select one of the following:

  • Exponent

  • Scientific

  • Factor of 10

  • Condensed

Explanation

Question 8 of 54

1

Which of the following options correctly describes elements and compounds?

Select one or more of the following:

  • The substance N2 is an example of a compound

  • There are many more known compounds than elements

  • Elements and compounds are both pure substances

  • A compounds contains two or more different elements

  • A compounds is a mixture

Explanation

Question 9 of 54

1

Express 2.6 x 10^4 in decimal notation

Select one of the following:

  • 260,000

  • 260

  • 26,000

  • 26

Explanation

Question 10 of 54

1

The periodic table is organized such that elements with similar ______ properties fall into vertical columns called ________.

Select one of the following:

  • Physical; groups

  • Physical; periods

  • Chemical; groups

  • Chemical; periods

Explanation

Question 11 of 54

1

Which of the following statements correctly describes subatomic particles? Select all that apply.

Select one or more of the following:

  • Protons are positively charged

  • The mass of an electron is much smaller than the mass of a proton

  • A neutron is much heavier than a proton

  • The electrons are located outside the nucleus of an atom

  • The charge on a neutron is equal but opposite to the charge on a proton

Explanation

Question 12 of 54

1

Fill the blank spaces to complete the text.

Elements in Group 17 are called , whereas elements in Group 18 are called gases.

Explanation

Question 13 of 54

1

Which of the following statements correctly describe the atomic number of an element? Select all that apply.

Select one or more of the following:

  • The atomic number of an element varies depending on the number of electrons present

  • The atomic number is equal to the number of protons in the nucleus

  • The atomic number equals the number of neutrons present in the atom

  • Each element has its own unique atomic number

Explanation

Question 14 of 54

1

Fill the blank space to complete the text.

Scientific notation expresses a quantity with a single digit before the decimal point and followed by raised to the appropriate power.

Explanation

Question 15 of 54

1

Express the quantity 0.0000000000835 correctly in scientific notation.

Select one of the following:

  • 8.35 x 10^11

  • 8.35 x 10^-11

  • 8.35 x 10^10

  • 8.35 x 10^-10

Explanation

Question 16 of 54

1

Which of the following are allotropes of oxygen?

Select one or more of the following:

  • O2

  • O3

  • CaO

  • CO2

Explanation

Question 17 of 54

1

Each element has a unique number of ___________, which is called the atomic number. For a neutral atom, this number is also equal to the number of ___________ present.

Select one or more of the following:

  • neutrons; protons

  • Electrons; protons

  • Protons; neutrons

  • Protons; electrons

Explanation

Question 18 of 54

1

Most elements occur in nature as _____________.

Select one of the following:

  • Single atoms

  • Diatomic molecules

  • Compounds

Explanation

Question 19 of 54

1

Minerals are _____________________.

Select one of the following:

  • Chemical compounds found in rocks and soil

  • Complex mixtures of metallic compounds

  • Diatomic molecules like N2

  • Elemental forms of metal found in the earth

Explanation

Question 20 of 54

1

Different forms of the same element (such as O2 and O3) are called ___________. These forms differ in the way atoms are bonded together.

Select one of the following:

  • Allotropes

  • Isotopes

  • Isotropes

  • Isomers

Explanation

Question 21 of 54

1

Which of the following are common types of minerals found in rocks and soil? Select all that apply.

Select one or more of the following:

  • Carbides

  • Nitrides

  • Oxides

  • Silicates

  • Aluminates

Explanation

Question 22 of 54

1

Which of the following options correctly describes the form(s) in which elements exist in nature? Select all that apply.

Select one or more of the following:

  • Nonmetals such as oxygen and nitrogen may occur either in elemental form in the form of compounds

  • Most metals can be mined from the earth in their pure, elemental states

  • Many metals exist as compounds of oxygen, or oxides.

  • Most elements exist as diatomic molecules such as O2

Explanation

Question 23 of 54

1

The composition of a mixture may be expressed as a percentage. Percent means parts per

Select one of the following:

  • Hundred

  • BIllion

  • Thousand

  • Million

Explanation

Question 24 of 54

1

Solid compounds of metals found in rocks and soil are called ________.

Select one of the following:

  • Allotropes

  • Mineral

  • Ores

Explanation

Question 25 of 54

1

Which of the following are examples of chemical change? Select all that apply.

Select one or more of the following:

  • Rusting of iron

  • Boiling water

  • Cutting aluminum foil

  • Burning a candle

Explanation

Question 26 of 54

1

Fill the blank spaces to complete the text.

Many metals occur as minerals in rocks and soil. A mineral in which a metal is bonded to oxygen is called an . whereas a mineral containing oxygen and silicon together is called an .

Explanation

Question 27 of 54

1

Silicon is a key component of electronic devices. This element is an ___________, a type of element also called an ____________.

Select one of the following:

  • Metalloid; nonconductor

  • Metal; semiconductor

  • Nonmetal; nonconductor

  • Metalloid; semiconductor

Explanation

Question 28 of 54

1

If a mixture of quartz and bauxite contains 78% quartz, this means that ________. (Select all that apply).

Select one or more of the following:

  • 200 g of this mixture contains 22g of bauxite

  • There are 78g of quartz for every 100g of bauxite

  • There are 78g of quartz for every 22g of bauxite

  • 150g of this mixture contain 117g of quartz

  • There are 78g of quartz in 100g of the mixture

Explanation

Question 29 of 54

1

Which of the following are physical changes? (Select all that apply.)

Select one or more of the following:

  • Tarnishing of silver

  • Melting ice

  • Breaking a bottle

  • Burning gasoline

Explanation

Question 30 of 54

1

Which metalloid is a key component of electronic devices?

Select one of the following:

  • Chromium

  • Iron

  • Sodium

  • Silver

  • Silicon

Explanation

Question 31 of 54

1

Silica is a naturally occurring oxide of silicon, SiO2, which is transparent. Pure crystalized SiO2 is known as ___________.

Select one of the following:

  • Sapphire

  • Diamond

  • Glass

  • Quartz

Explanation

Question 32 of 54

1

Crystal is a solid that is ________________________________________________.

Select one of the following:

  • Disordered/random arrangement of constituent particles

  • Highly ordered arrangement of constituent particles

Explanation

Question 33 of 54

1

Amorphous solids are _________________________________.

Select one of the following:

  • Highly ordered arrangement of constituent particles

  • Disordered/random arrangement of constituent particles

Explanation

Question 34 of 54

1

1 ppm is _____ times smaller than 1%

Select one of the following:

  • 1000

  • 100,000

  • 10,000

  • 1,000,000

Explanation

Question 35 of 54

1

Silica glass is made by ________________.

Select one of the following:

  • Heating sand with acid to break the highly ordered structure so that it can harden and form glass when cooled

  • Heating sand to a temperature high enough to melt it and then cooling the liquid until it hardens

  • Heating graphite (carbon) at high temperature under high pressure

Explanation

Question 36 of 54

1

Which of the following options correctly describe silica? Select all that apply.

Select one or more of the following:

  • Quartz is a form of silica

  • Silica is naturally occurring substance

  • Pure silica is a highly colored substance

  • Silica is a form of pure, elemental silicon

  • Silica has a well-ordered structure composed of repeating linkages between Si and O

Explanation

Question 37 of 54

1

A solid that has a highly ordered structure at the atomic level is referred to an an ___________, whereas solids with a relatively disordered structure are described as ________________.

Select one of the following:

  • Glass; entropic

  • Glass; amorphous

  • Crystal; entropic

  • Crystal; amorphous

Explanation

Question 38 of 54

1

Fill the blank space to complete the text.

glass is strengthened glass that has been heated to high temperatures and cooled, which results in internal stresses.

Explanation

Question 39 of 54

1

Which of the following elements are commonly added to sand when making glass, to improve thermal properties? Select all that apply.

Select one or more of the following:

  • Potassium

  • Chromium

  • Aluminum

  • Baron

Explanation

Question 40 of 54

1

An approach to analyzing the life cycle of an item, beginning with the raw materials from which it is made to its ultimate disposal, is called the ___________ approach.

Select one of the following:

  • Cradle-to-grave

  • Production/disposal

  • Recycling

Explanation

Question 41 of 54

1

Fill the blank space to complete the text.

The process of quickly cooling molten glass has the effect of the material.

Explanation

Question 42 of 54

1

An approach to consumer goods that aims at recycling, so that the end of the life cycle of one item loads naturally into the beginning of the life cycle of another, is the __________ approach.

Select one of the following:

  • Cradle-to-grave

  • Recycling

Explanation

Question 43 of 54

1

The conversion of sand into high-purity silicon for computer chip fabrication would fall under which life cycle analysis for a laptop computer?

Select one of the following:

  • Material extraction and processing

  • Laptop fabrication

  • Use by consumers

  • Recycling and/or disposal

Explanation

Question 44 of 54

1

What are the environmental challenges to extracting metals from recycled electronic devices? Select all that apply.

Select one or more of the following:

  • The solvents used to remove the plastics are not generally environmentally friendly

  • Contaminated groundwater could contribute to an increase of cancers in surrounding communities

  • The process is very costly in energy, more so than mining the metals from the ground

  • Groundwater could be contaminated with heavy metals

Explanation

Question 45 of 54

1

Which if the following form the focus of the cradle to grave approach to consumer goods? Select all that apply.

Select one or more of the following:

  • The waste products created when the goods are made

  • Products that can be made from the goods

  • The raw materials from which the goods are made

  • The energy consumed to produce the goods

Explanation

Question 46 of 54

1

A "cradle-to-grave" approach to analysis of the life cycle of an item includes that ideas that ________________.

Select one of the following:

  • The end of the life cycle of one item leads naturally into the beginning of the life cycle of another

  • The end of the life cycle of an item can be defined precisely

  • The life cycle of an item should be described in detail from its manufacture to its disposal

Explanation

Question 47 of 54

1

Which of the following are essential parts of life cycle analysis? Select all that apply.

Select one or more of the following:

  • Marketing expenses

  • Use by consumers

  • Research and development

  • Recycling and disposal

  • Fabrication

Explanation

Question 48 of 54

1

When an electronic device is recycled, the metals are recovered by ____________.

Select one of the following:

  • Boiling in solvents

  • Treatment with strong acid

  • Crushing the circuit boards and then filtering out the metals

  • Physically picking them out with forceps

Explanation

Question 49 of 54

1

Which of the following are elements? Select all that apply.

Select one or more of the following:

  • CaCo3

  • O2

  • NaCl

  • Cu

  • Na

Explanation

Question 50 of 54

1

Which of the following are examples of mixtures? Select all that apply.

Select one or more of the following:

  • Nitrogen gas

  • Argon

  • Carbon dioxide

  • Tap water

  • Soil

Explanation

Question 51 of 54

1

Chemistry is the study of _______________. Select all the options that correctly complete the sentence.

Select one or more of the following:

  • The properties of substances

  • The interaction of living systems

  • The changes of matter

  • Matter and its composition

Explanation

Question 52 of 54

1

Which of the following are pure substances? Select all that apply.

Select one or more of the following:

  • H2O

  • N2

  • Salt water

Explanation

Question 53 of 54

1

A molecule is an independent structure composed of two or more _____________ chemically bonded together.

Select one of the following:

  • Atoms

  • Compounds

  • Elements

Explanation

Question 54 of 54

1

Which of the following elements commonly occur as diatomic molecules? Select all that apply.

Select one or more of the following:

  • Fluorine

  • Hydrogen

  • Nitrogen

  • Oxygen

  • Neon

Explanation

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