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SESSION 1: Introduction to Chemistry Code: BIOB111 > Concept 1: Valid measurements > Flashcards

Concept 1: Valid measurements Flashcards

1
Q

Why are accurate measurements important?

A

important to assess structure & properties of matter

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2
Q

Why is the number important when measuring the amount of water in a dam?

A

important to make the measurement meaningful:

  1. Without a number, the unit has no position on its scale: Litres
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3
Q

Why is the unit important when measuring the amount of water in a dam?

A

important to make the measurement meaningful:

  1. without the unit, the number could represent anything
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4
Q

What must be included in the measurement for it to be valid?

A

a number and a unit

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5
Q

Name two ways to express measurements

A
  1. Standard / Decimal Notation
  2. Scientific notation
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6
Q

Changing 93,000,000.00 into scientific notation

A
  1. move decimal point behind the first whole number
  2. Count the number of places moved the decimal point
  3. exponent = positive when # converted is above 1
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7
Q

Changing 0.0000037 into scientific notation

A
  1. move decimal point in front of the first whole number
  2. Count the number of places moved the decimal point
  3. exponent = negative when # converted is below 1
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8
Q

The measurement 8310.90 expressed in scientific notation becomes?

A

8.3109 x 103

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9
Q

What is standard/decimal notation?

A

writing a number using a decimal point

e.g. 0.0387

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10
Q

what is Scientific notation?

A

an easier way to express very large or very small number

e.g. 3.87 x 10-2

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11
Q

What is matter?

A

All objects that occupy space are made up of matter

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12
Q

What are the three states of matter?

A
  1. Solid
  2. liquid
  3. gas
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13
Q

Define a solid

A
  1. A solid has a definite shape
  2. and a dinite volume
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14
Q

Define a liquid

A
  1. A liquid has an indefinite shape, it takes the shape of its container
  2. and a definite volume
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15
Q

Define a gas

A
  1. A gas has an indefinite shape and an indefinite volume
  2. it assumes the shape and volume of its container
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16
Q

What are the main broad groups of elements in the periodic table

A
  1. Representative elements
  2. noble gas elements
  3. transition elements
  4. inner transition elements.
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17
Q

How can matter change?

A
  1. physical change
  2. chemical change
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18
Q

What is a physical change?

A
  1. No new substances are created
  2. Type of matter, same before as after a physical change
  3. Matter changes from one state to another
    1. solid into a liquid
    2. Liquid to a gas.
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19
Q

What is a chemical change?

A
  1. One or more new substances are created
  2. The type of matter before and after, different after chemical change
  3. Matter changed from one substance into another substance via chemical reaction
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20
Q

Two categories of matter?

A
  1. pure substances
  2. mixtures
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21
Q

two groups of pure substances?

A
  1. Elements
  2. Compounds
22
Q

What is a molecule?

A
  1. molecule = Groups of atoms
  2. Molecules are composed of 2 or more atoms joined via chemical bonds
23
Q

Define a compound?

A
  1. A molecule that contains more than one type of atom
  2. atoms are joined via chemical bonds
24
Q

Matter is made up of?

25
Q

% of water in the human body?

A
  1. 50%-65%
  2. H2O
26
Q

How are elements found in nature?

A
  1. in single atoms
  2. as molecules containing 1 type of atom
  3. Example, oxygen molecule
27
Q

Reversed Cards

important to assess structure & properties of matter

A

Why are accurate measurements important?

28
Q

Reversed Cards

important to make the measurement meaningful:

  1. Without a number, the unit has no position on its scale: Litres
A

Why is the number important when measuring the amount of water in a dam?

29
Q

Reversed Cards

important to make the measurement meaningful:

  1. without the unit, the number could represent anything
A

Why is the unit important when measuring the amount of water in a dam?

30
Q

Reversed Cards

a number and a unit

A

What must be included in the measurement for it to be valid?

31
Q

Reversed Cards

  1. Standard / Decimal Notation
  2. Scientific notation
A

Name two ways to express measurements

32
Q

Reversed Cards

  1. Move the decimal point
  2. place behind the first whole number
  3. Count the number of places moved the decimal point
A

Changing 93,000,000.00 into scientific notation

33
Q

Reversed Cards

  1. Move the decimal point
  2. place in front of the first whole number
  3. Count the number of places moved the decimal point
  4. exponent = negative when # converted is below 1
A

Changing 0.0000037 into scientific notation

34
Q

Reversed Cards

8.3109 x 103

A

The measurement 8310.90 expressed in scientific notation becomes?

35
Q

Reversed Cards

writing a number using a decimal point

e.g. 0.0387

A

What is standard/decimal notation?

36
Q

Reversed Cards

an easier way to express very large or very small number

e.g. 3.87 x 10-2

A

what is Scientific notation?

37
Q

Reversed Cards

All objects that occupy space are made up of matter

A

What is matter?

38
Q

Reversed Cards

  1. Solid
  2. liquid
  3. gas
A

What are the three states of matter?

39
Q

Reversed Cards

  1. A solid has a definite shape
  2. and a dinite volume
A

Define a solid

40
Q

Reversed Cards

  1. A liquid has an indefinite shape, it takes the shape of its container
  2. and a definite volume
A

Define a liquid

41
Q

Reversed Cards

  1. A gas has an indefinite shape and an indefinite volume
  2. it assumes the shape and volume of its container
A

Define a gas

42
Q

Reversed Cards

  1. Representative elements
  2. noble gas elements
  3. transition elements
  4. inner transition elements.
A

What are the main broad groups of elements in the periodic table

43
Q

Reversed Cards

  1. physical change
  2. chemical change
A

How can matter change?

44
Q

Reversed Cards

  1. No new substances are created
  2. Type of matter, same before as after a physical change
  3. Matter changes from one state to another
    1. solid into a liquid
    2. Liquid to a gas.
A

What is a physical change?

45
Q

Reversed Cards

  1. One or more new substances are created
  2. The type of matter before and after, different after chemical change
  3. Matter changed from one substance into another substance via chemical reaction
A

What is a chemical change?

46
Q

Reversed Cards

  1. pure substances
  2. mixtures
A

Two categories of matter?

47
Q

Reversed Cards

  1. Elements
  2. Compounds
A

two groups of pure substances?

48
Q

Reversed Cards

  1. molecule = Groups of atoms
  2. Molecules are composed of 2 or more atoms joined via chemical bonds
A

What is a molecule?

49
Q

Reversed Cards

  1. A molecule that contains more than one type of atom
  2. atoms are joined via chemical bonds
A

Define a compound?

50
Q

Reversed Cards

  1. Atoms
A

Matter is made up of?

51
Q

Reversed Cards

  1. 50%-65%
  2. H2O
A

% of water in the human body?

52
Q

Reversed Cards

  1. in single atoms
  2. as molecules containing 1 type of atom
  3. Example, oxygen molecule
A

How are elements found in nature?

SESSION 1: Introduction to Chemistry Code: BIOB111 (3 decks)

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