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Science > 1st 9 wks Test > Flashcards

1st 9 wks Test Flashcards

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1
Q

in the periodic table, the most reactive metals are found

A

in group 1, the first column on the left

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2
Q

which property of bromine could you NOT predict based on the fact that it is a nonmetal in the halogen family

A

liquid at room temperature

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3
Q

in a neutral atom, the number of protons equals the number of

A

electrons

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4
Q

the elements in a row of the periodic table

A

have properties that change in a pattern

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5
Q

the elements in a column of the periodic table

A

are in the same period

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6
Q

what information in the periodic table indicates the number of protons in an atom

A

the elements atomic number

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7
Q

which parts of the atom move around the nucleus

A

electrons

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8
Q

the atomic number of an element is based on

A

number of protons in its nucleus

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9
Q

what is true about transition metals

A

they include familiar metals such as gold, silver, copper, and nickel

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10
Q

the elements that do not ordinarily form compounds are

A

halogens

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11
Q

which particles in atoms have a negative electric charge

A

electrons

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12
Q

fluorine, chlorine, bromine, and iodine are part of the family called

A

halogens

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13
Q

magnesium bromide is an ionic compound with the chemical formula MgBr2 what does the 2 mean

A

there are 2 bromide ions for every magnesium ion

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14
Q

each group in the periodic table has its own characteristic properties based on the number of

A

protons

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15
Q

when an atom loses an electron, it becomes a

A

negative ion

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16
Q

an ionic bond is the attraction between

A

neutral atoms

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17
Q

what is the chemical name for the compound with the formula Na2S

A

sodium sulfide

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18
Q

in what form can an ionic compound conduct electricity

A

when dissolved in water

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19
Q

a chemical bond formed when two atoms share electrons is called a(n)

A

covalent bond

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20
Q

the smallest particle of an element is called a(n)

A

atom

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21
Q

in the chemical formula for an ionic compound, which item is written first

A

positive ion

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22
Q

which particles in an atom are in the nucleus

A

protons and neutrons

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23
Q

electrons involved in bonding between atoms are

A

valence electrons

24
Q

what is the greatest number of valence electrons an atom can have

A

8

25
Q

if atoms of a halogen nonmetal (Group 17) gain one electron, the atoms then have

A

8 valence electrons

26
Q

a chemical equation that shows the same number of each kind of atom on both sides of the equation is said to be

A

balanced

27
Q

anything that has mass and takes up space

A

matter

28
Q

CaCo3 represents a chemical

A

formula

29
Q

a shorter, easier way to show chemical reactions, using symbols instead of words, is called a

A

chemical equation

30
Q

a bottle of hydrogen peroxide that eventually turns into a bottle of water and oxygen gas is an example of a

A

decomposition reaction

31
Q

a chemical reaction that absorbs energy in the form of heat is described as

A

unbalanced

32
Q

the minimum amount of energy that has to be added to start a reaction is the

A

activation energy

33
Q

the number placed below an element’s symbol in a chemical formula is called a

A

subscript

34
Q

bc atoms are so small

A

scientists create models to describe them

35
Q

in an atom of fluorine, how many electrons would be found in the 2nd energy level

A

7

36
Q

in an atom of carbon, how many energy levels will it have

A

2

37
Q

how many electrons are located on the 3rd energy level of calcium

A

8

38
Q

the combined force of attraction among water molecules and with the molecules of surrounding materials

A

capillary action

39
Q

the process by which a gas changes to liquid

A

condensation

40
Q

the process by which molecules at the surface of a liquid absorb enough energy to change to the gaseous state

A

evaporation

41
Q

the amount of heat needed to increase the temperature of a certain amount of a substance by 1 degree Celsius

A

specific heat

42
Q

a substance that dissolves another substance

A

solution

43
Q

a mixture that forms when one substance dissolves another

A

solvent

44
Q

form of a substance, including solid, liquid, and gas

A

state

45
Q

the tightness across the surface of water caused by the polar molecules pulling on each other

A

surface tension

46
Q

water is made up of _______ bonded together to form molecules

A

atoms

47
Q

chemical formula for water

A

H2O

48
Q

a molecule that has electrically charged area is called a(n)

A

polar molecules

49
Q

how does capillary action allow water to climb up the sides if a straw

A

the forces of adhesion and hesion working together

50
Q

a mixture that forms when one substance dissolves another is called a(n) __________.

A

solution

51
Q

the substance that does the dissolving is called a(n) _________

A

solvent

52
Q

why is water considered a polar substance

A

bc positive and negative hydrogen ends of on water molecule attract the negative oxygen ends of nearby water molecules

53
Q

which state of water is a allows a fish to remain in a lake when winter temperatures are below 0°C

A

when the temperature reaches 0 degrees Celsius, The solid ice melts and becomes a liquid wire which allows fish to remain in water

54
Q

what happens to the molecules of water vapor when the temperature of the gas cools to 100°C

A

at 100°C, liquid water boils in the molecules have enough Energy today scape the liquid and become water vapor

55
Q

why is water often called the “universal solvent”

A

any substance is dissolved in water because water is polar

Science (12 decks)

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