28268435
Descripción
Test por Ana silverman, actualizado hace más de 1 año
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Creado por Ana silverman
hace más de 3 años
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Pregunta 1
Pregunta
Which of the following options correctly describes atoms? Select all that apply.
Respuesta
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An atom is the smallest unit of an element that can exist as a stable, independent entity
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Atoms are extremely small
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Compounds contain two or more different types of atoms
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Atoms are divisible by ordinary chemical processes
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Elements are made up of several types of atoms
Pregunta 2
Pregunta
Which of the following options correctly describe the periodic table? Select all that apply.
Respuesta
-
The horizontal rows in the periodic table are called groups
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The elements in the periodic table are arranged based on similar chemical properties
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The periodic table includes compounds as well as elements
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The periodic table contained the chemical symbols that represent the elements
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Elements found on the left side of the periodic table are called nonmetals
Pregunta 3
Pregunta
What group are Nobel gases apart of?
Respuesta
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Group 1
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Group 2
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Group 17
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Group 18
Pregunta 4
Pregunta
What group are halogens apart of?
Respuesta
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Group 1
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Group 2
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Group 17
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Group 18
Pregunta 5
Pregunta
What group are alkali metas apart of on the periodic table?
Respuesta
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Group 1
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Group 2
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Group 17
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Group 18
Pregunta 6
Pregunta
What group are alkaline earth metals apart of on the periodic table?
Respuesta
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Group 1
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Group 2
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Group 17
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Group 18
Pregunta 7
Pregunta
The number 10,000 can be expressed as 1 x 10^4. This second form is called ______ notation.
Respuesta
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Exponent
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Scientific
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Factor of 10
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Condensed
Pregunta 8
Pregunta
Which of the following options correctly describes elements and compounds?
Respuesta
-
The substance N2 is an example of a compound
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There are many more known compounds than elements
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Elements and compounds are both pure substances
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A compounds contains two or more different elements
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A compounds is a mixture
Pregunta 9
Pregunta
Express 2.6 x 10^4 in decimal notation
Respuesta
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260,000
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260
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26,000
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26
Pregunta 10
Pregunta
The periodic table is organized such that elements with similar ______ properties fall into vertical columns called ________.
Respuesta
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Physical; groups
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Physical; periods
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Chemical; groups
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Chemical; periods
Pregunta 11
Pregunta
Which of the following statements correctly describes subatomic particles? Select all that apply.
Respuesta
-
Protons are positively charged
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The mass of an electron is much smaller than the mass of a proton
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A neutron is much heavier than a proton
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The electrons are located outside the nucleus of an atom
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The charge on a neutron is equal but opposite to the charge on a proton
Pregunta 12
Pregunta
Elements in Group 17 are called [blank_start]_____________[blank_end] , whereas elements in Group 18 are called [blank_start]________[blank_end] gases.
Respuesta
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Halogens
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noble gases
Pregunta 13
Pregunta
Which of the following statements correctly describe the atomic number of an element? Select all that apply.
Respuesta
-
The atomic number of an element varies depending on the number of electrons present
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The atomic number is equal to the number of protons in the nucleus
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The atomic number equals the number of neutrons present in the atom
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Each element has its own unique atomic number
Pregunta 14
Pregunta
Scientific notation expresses a quantity with a single digit before the decimal point and followed by [blank_start]______[blank_end] raised to the appropriate power.
Respuesta
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10
Pregunta 15
Pregunta
Express the quantity 0.0000000000835 correctly in scientific notation.
Respuesta
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8.35 x 10^11
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8.35 x 10^-11
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8.35 x 10^10
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8.35 x 10^-10
Pregunta 16
Pregunta
Which of the following are allotropes of oxygen?
Respuesta
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O2
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O3
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CaO
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CO2
Pregunta 17
Pregunta
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.
Respuesta
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neutrons; protons
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Electrons; protons
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Protons; neutrons
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Protons; electrons
Pregunta 18
Pregunta
Most elements occur in nature as _____________.
Respuesta
-
Single atoms
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Diatomic molecules
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Compounds
Pregunta 19
Pregunta
Minerals are _____________________.
Respuesta
-
Chemical compounds found in rocks and soil
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Complex mixtures of metallic compounds
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Diatomic molecules like N2
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Elemental forms of metal found in the earth
Pregunta 20
Pregunta
Different forms of the same element (such as O2 and O3) are called ___________. These forms differ in the way atoms are bonded together.
Respuesta
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Allotropes
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Isotopes
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Isotropes
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Isomers
Pregunta 21
Pregunta
Which of the following are common types of minerals found in rocks and soil? Select all that apply.
Respuesta
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Carbides
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Nitrides
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Oxides
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Silicates
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Aluminates
Pregunta 22
Pregunta
Which of the following options correctly describes the form(s) in which elements exist in nature? Select all that apply.
Respuesta
-
Nonmetals such as oxygen and nitrogen may occur either in elemental form in the form of compounds
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Most metals can be mined from the earth in their pure, elemental states
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Many metals exist as compounds of oxygen, or oxides.
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Most elements exist as diatomic molecules such as O2
Pregunta 23
Pregunta
The composition of a mixture may be expressed as a percentage. Percent means parts per
Respuesta
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Hundred
-
BIllion
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Thousand
-
Million
Pregunta 24
Pregunta
Solid compounds of metals found in rocks and soil are called ________.
Respuesta
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Allotropes
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Mineral
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Ores
Pregunta 25
Pregunta
Which of the following are examples of chemical change? Select all that apply.
Respuesta
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Rusting of iron
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Boiling water
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Cutting aluminum foil
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Burning a candle
Pregunta 26
Pregunta
Many metals occur as minerals in rocks and soil. A mineral in which a metal is bonded to oxygen is called an [blank_start]________________[blank_end]. whereas a mineral containing oxygen and silicon together is called an [blank_start]________________[blank_end].
Respuesta
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oxcide
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silicate
Pregunta 27
Pregunta
Silicon is a key component of electronic devices. This element is an ___________, a type of element also called an ____________.
Respuesta
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Metalloid; nonconductor
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Metal; semiconductor
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Nonmetal; nonconductor
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Metalloid; semiconductor
Pregunta 28
Pregunta
If a mixture of quartz and bauxite contains 78% quartz, this means that ________. (Select all that apply).
Respuesta
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200 g of this mixture contains 22g of bauxite
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There are 78g of quartz for every 100g of bauxite
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There are 78g of quartz for every 22g of bauxite
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150g of this mixture contain 117g of quartz
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There are 78g of quartz in 100g of the mixture
Pregunta 29
Pregunta
Which of the following are physical changes? (Select all that apply.)
Respuesta
-
Tarnishing of silver
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Melting ice
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Breaking a bottle
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Burning gasoline
Pregunta 30
Pregunta
Which metalloid is a key component of electronic devices?
Respuesta
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Chromium
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Iron
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Sodium
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Silver
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Silicon
Pregunta 31
Pregunta
Silica is a naturally occurring oxide of silicon, SiO2, which is transparent. Pure crystalized SiO2 is known as ___________.
Respuesta
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Sapphire
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Diamond
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Glass
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Quartz
Pregunta 32
Pregunta
Crystal is a solid that is ________________________________________________.
Respuesta
-
Disordered/random arrangement of constituent particles
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Highly ordered arrangement of constituent particles
Pregunta 33
Pregunta
Amorphous solids are _________________________________.
Respuesta
-
Highly ordered arrangement of constituent particles
-
Disordered/random arrangement of constituent particles
Pregunta 34
Pregunta
1 ppm is _____ times smaller than 1%
Respuesta
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1000
-
100,000
-
10,000
-
1,000,000
Pregunta 35
Pregunta
Silica glass is made by ________________.
Respuesta
-
Heating sand with acid to break the highly ordered structure so that it can harden and form glass when cooled
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Heating sand to a temperature high enough to melt it and then cooling the liquid until it hardens
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Heating graphite (carbon) at high temperature under high pressure
Pregunta 36
Pregunta
Which of the following options correctly describe silica? Select all that apply.
Respuesta
-
Quartz is a form of silica
-
Silica is naturally occurring substance
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Pure silica is a highly colored substance
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Silica is a form of pure, elemental silicon
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Silica has a well-ordered structure composed of repeating linkages between Si and O
Pregunta 37
Pregunta
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 ________________.
Respuesta
-
Glass; entropic
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Glass; amorphous
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Crystal; entropic
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Crystal; amorphous
Pregunta 38
Pregunta
[blank_start]___________[blank_end] glass is strengthened glass that has been heated to high temperatures and cooled, which results in internal stresses.
Respuesta
-
Tempured
Pregunta 39
Pregunta
Which of the following elements are commonly added to sand when making glass, to improve thermal properties? Select all that apply.
Respuesta
-
Potassium
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Chromium
-
Aluminum
-
Baron
Pregunta 40
Pregunta
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.
Respuesta
-
Cradle-to-grave
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Production/disposal
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Recycling
Pregunta 41
Pregunta
The process of quickly cooling molten glass has the effect of [blank_start]_____________[blank_end] the material.
Respuesta
-
strengthening
Pregunta 42
Pregunta
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.
Respuesta
-
Cradle-to-grave
-
Recycling
Pregunta 43
Pregunta
The conversion of sand into high-purity silicon for computer chip fabrication would fall under which life cycle analysis for a laptop computer?
Respuesta
-
Material extraction and processing
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Laptop fabrication
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Use by consumers
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Recycling and/or disposal
Pregunta 44
Pregunta
What are the environmental challenges to extracting metals from recycled electronic devices? Select all that apply.
Respuesta
-
The solvents used to remove the plastics are not generally environmentally friendly
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Contaminated groundwater could contribute to an increase of cancers in surrounding communities
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The process is very costly in energy, more so than mining the metals from the ground
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Groundwater could be contaminated with heavy metals
Pregunta 45
Pregunta
Which if the following form the focus of the cradle to grave approach to consumer goods? Select all that apply.
Respuesta
-
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
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The energy consumed to produce the goods
Pregunta 46
Pregunta
A "cradle-to-grave" approach to analysis of the life cycle of an item includes that ideas that ________________.
Respuesta
-
The end of the life cycle of one item leads naturally into the beginning of the life cycle of another
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The end of the life cycle of an item can be defined precisely
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The life cycle of an item should be described in detail from its manufacture to its disposal
Pregunta 47
Pregunta
Which of the following are essential parts of life cycle analysis? Select all that apply.
Respuesta
-
Marketing expenses
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Use by consumers
-
Research and development
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Recycling and disposal
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Fabrication
Pregunta 48
Pregunta
When an electronic device is recycled, the metals are recovered by ____________.
Respuesta
-
Boiling in solvents
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Treatment with strong acid
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Crushing the circuit boards and then filtering out the metals
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Physically picking them out with forceps
Pregunta 49
Pregunta
Which of the following are elements? Select all that apply.
Respuesta
-
CaCo3
-
O2
-
NaCl
-
Cu
-
Na
Pregunta 50
Pregunta
Which of the following are examples of mixtures? Select all that apply.
Respuesta
-
Nitrogen gas
-
Argon
-
Carbon dioxide
-
Tap water
-
Soil
Pregunta 51
Pregunta
Chemistry is the study of _______________. Select all the options that correctly complete the sentence.
Respuesta
-
The properties of substances
-
The interaction of living systems
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The changes of matter
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Matter and its composition
Pregunta 52
Pregunta
Which of the following are pure substances? Select all that apply.
Respuesta
-
H2O
-
N2
-
Salt water
Pregunta 53
Pregunta
A molecule is an independent structure composed of two or more _____________ chemically bonded together.
Respuesta
-
Atoms
-
Compounds
-
Elements
Pregunta 54
Pregunta
Which of the following elements commonly occur as diatomic molecules? Select all that apply.
Respuesta
-
Fluorine
-
Hydrogen
-
Nitrogen
-
Oxygen
-
Neon
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