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Science > Chemistry: Bascis and periodic table > Flashcards

Chemistry: Bascis and periodic table Flashcards

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1
Q

Periodic table

Where are the non`metals on the periodic table?

A

The non-metals are found on the right of the ‘staircase line’

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2
Q

pH scale

What is defined as a neutral pH?

A

A pH of 7 is defined as a neutral pH, neither acidic or basic

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3
Q

pH scale

What is an acidic pH level?

A

Acids have a pH less than 7

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4
Q

Periodic table

What is another word for groups of Elements?

A

Elemental groups are sometimes referred to as families

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5
Q

Chemistry

What is a chemical change?

A

Occurs whenever a new substance is produced. The original substances are called the reactants. The new substances are called the products.

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6
Q

Periodic table

What is the appearance of metals?

A

They are shiny and lustre

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7
Q

Chemistry

What is a compound?

A

A pure substance made of two or more elements in a fixed ratio that cannot be separated by physical means (ex: AgCl)

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8
Q

Chemistry

How can you test if oxygen gas is present?

A

oxygen gas can be tested for by the use of glowing splint. If oxygen gas is present, the splint will burst into flames.

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9
Q

Periodic table

What is the state of metals at room temperature?

A

Solid and room temp except mercury

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10
Q

Periodic table

What is the state of metaloids at room temp?

A

Solid at room temp

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11
Q

Chemistry

What is a chemical property?

A

describes the ability of a substance to change into a new substance (ex: flammability, reactivity)

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12
Q

Chemistry

What are clues for a chemical change?

A
  1. A new color occurs
  2. heat is produced or absorbed
  3. light is produced
  4. bubbles or gas are formed in a liquid or a new odor is produced
  5. A new solid is formed if the solid is formed from the mixing of the two solutions, it is called a precipitate
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13
Q

Periodic table

Why are some elements grouped together?

A

The elements are sorted by atomic number. Elements in the same group have similar physical and chemical properties.

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14
Q

Periodic table

What is the malleability and ductility of metaloids?

A

Brittle and not ductile

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15
Q

Chemistry

What is a physical property?

A

is a characteristic of the substance (ex: state, color, malleability,ductility,conductivity, solubility)

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16
Q

Chemistry

What is a heterogeneous mixture?

A

A mixture having two or more visible phases (ex: Pizza, milk) These are also called mechanical mixtures

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17
Q

Chemistry

What is a physical change?

A

occurs when there is a change in the shape, size, state of a substance. (ex:melting, freezing, subliming, dissolving)

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18
Q

Periodic table

What is the malleability and ductility of non-metals?

A

Brittle and non-ductile

19
Q

Periodic table

What is the state of non metals?

A

most are gases some are solid and bromine is a liquid

20
Q

Periodic table

What is the name for the elements in group 2?

A

Alkaline earth metals

21
Q

Periodic table

What is the name of group 17 elements?

A

Halogens

22
Q

Periodic table

What is the name for the elements in group 1?

A

Alkali metals

23
Q

Periodic table

What is the conductivity of metals?

A

Metals are good conductors of heat and electricity

24
Q

Periodic table

What is the conductivity of non-metals?

A

poor conductors of heat and electricity

25
Q

Chemistry

What is a pure substance?

A

a sample of matter that is made up of only one kind of particle. A pure substance can be represented by a chemical formula. (Ex: Salt, NaCl) (Silver, Ag)

26
Q

Chemistry

What is matter?

A

Matter is defined by anything that has mass and occupies space.

27
Q

Chemistry

What is Chemistry?

A

chemistry is defined by the study of matter?

28
Q

pH scale

How much more basic is milk of magnesium than baking soda?

A

milk of magnesium (pH=11) is one hundred times more basic than baking soda (pH=9)

29
Q

Periodic table

What i the conductivity of metaloids??

A

many conduct electricity. They are poor conductors of heat.

30
Q

Chemistry

What is a homogeneous mixture?

A

A mixture having only one visible phase (Ex: salt, water, stainless steel) These are also called solutions aqueous water based solutions are transplants

31
Q

Chemistry

What is a mixture?

A

A sample of matter containing two or more pure substances in variable ratios, which can be separated by physical means (Ex: mixing salt and sand and sugar and water)

32
Q

pH scale

What is a basic pH?

A

bases have a pH greater than 7

33
Q

pH scale

What is the most common indicator?

A

Litmus paper

34
Q

Periodic table

What is the appearance of metaloids?

A

metaloids can be lustrous or dull

35
Q

Periodic table

What is the appearance of Non-metals?

A

Non-metals are dull and non lustrous

36
Q

Periodic table

What is the ductility and malleability of metals?

A

metals are malleable an ductile

37
Q

Chemistry

What is an Element?

A

A pure substance that cannot be broken down into simpler substances. Elements contain only one kind of atom

38
Q

Periodic table

What is the name of the elements in group 18

A

Noble gases

39
Q

pH scale

What is a pH?

A

pH is a method of indicating the acidity or basicity of a substance?

40
Q

Periodic table

Where are the metals found on the periodic table?

A

The metals are found on the left of the ‘staircase line’

41
Q

Chemistry

How can you test if hydrogen gas is present

A

hydrogen gas can be tested for by the use of a burning splint. If hydrogen is present a ‘pop’ sound will be heard

42
Q

pH scale

What does each step on the scale represent?

A

Each step on the scale represents a tenfold change in acidity or basicity

43
Q

pH scale

How much more acidic is orange juice than tomatoes?

A

Orange juice (pH=4) is ten times more acidic than tomatoes (pH=5)

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