week 2 Flashcards

1
Q

what is the chemical behaviour of an atom determined by a- no. protons b- no. neutrons c- no. and arrangement of electrons d- size of the atom

A

c

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2
Q

when atoms complete the outer shell of electrons they form what bond?

A

covalent

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3
Q

in a nitrogen atoms, 3 pairs of electrons are shared by 2 nitrogen atoms. what bond is this?

A

triple covalent

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4
Q

If a pair of electrons is unequally shared between 2 atoms, what bond occurs?

A

polar covalent

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5
Q

ions with a positive charge are called

A

cations

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6
Q

ionics bonds are formed by a- atoms sharing electrons b- electrons are completely transferred c- share the electron

A

b

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7
Q

the weakest bond between 2 or more atoms

A

hydrogen

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8
Q

is this a reaction of decomposition?

h2 + CL 2 = 2 HCL

A

yes

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9
Q

what reaction is this ?

A+B =AB

A

synthesis

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10
Q

inorganic compounds that are soluble and whose ions will conduct electrical current

A

electrolytes

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11
Q

the bond between sodium and chloride in the compound sodiumchloride is what bond?

A

ionic

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12
Q

identify cations a- Na b-Cl c- K d- Na & Cl d- Na & K

A

d

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13
Q

which one is an anion a-Na b-Cl c-K d-a&b e- a&c

A

b

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14
Q

which of the following indicate one containing only trace elements a-sulphur/Cl/O b- selenium/H/Ca c-boron/O/C d- silicon/florine/tin

A

d

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15
Q

when a needle is floating on the surface of a glass of water what is it called

A

surface tension

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16
Q

Eg of an organic substance a-table sugar b-sodium c-table salt d-oxygen

A

a

17
Q

Eg of an inorganic substance a-fructose b-water c-lipid d-glycogen

A

b

18
Q

what element is plentiful in the human body

A

oxygen

19
Q

what element is 2nd abundant

A

carbon

20
Q

what is CO2 ?

A

carbon dioxide

21
Q

what is the molecule H2 called?

A

hydrogen

22
Q

H2O is an eg of what formular?

a-ionic b-molecular c-covalent

A

b

23
Q

a nanometre is ?

A

10-9 metre

24
Q

when electrons are transferred from one to another what bond is formed

A

ionic

25
Q

calcium has 2 electron in outer shell, when they form ions what charge would it be ?
+2 / -2

A

+2

26
Q

a substance that consists entirely of atoms with the same atomic number is what?

A

element

27
Q

when electrons move around the centre at high speed it forms what?

A

electron cloud

28
Q

electrons is an atom occupy an orderly series of electron shells or ?

A

energy levels

29
Q

a __ is a combination of 2+ atoms with different physical/chemical properties

A

compound

30
Q

ions with positive charge

A

cations

31
Q

ions with negative charge

A

anions

32
Q

chemical bond between atoms were new chemical substance made is?

A

chemical reaction

33
Q

a __ is a homogeneous mixture containing a solvent and a solute

A

solution

34
Q

readily dissolve in water is ?

A

hydrophilic

35
Q

does not dissolve in water is?

A

hydrophobic

36
Q

what is a heterogeneous mixture with visible solutes that tend to settle out ?

A

suspensions

37
Q

what is a heterogeneous mixture whose solutes do not settle out ?

A

colloid

38
Q

what is 2+ mixtures components physically intermixed but not chemically bonded

A

mixtures