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Y10 Chemistry revision Flashcards

1
Q

What kind of bond is created between a group 1 metal and a halogen?

A

Ionic.

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2
Q

What kind of bonding would lead to the occurrence of hydrogen sulfide?

A

Ionic

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3
Q

Element, compound or mixture?

A substance only containing one type of atoms.

A

Element

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4
Q

What is matter?

A

matter is defined as anything that has mass, can be seen and touched. Normally separated in 3 major states: Solid, Liquid and Gas.

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5
Q

Element, compound or mixture?

A substance containing two or more types of atoms, that are not chemically bonded together.

A

Mixture

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6
Q

A mixture is two or more substances. It can / can’t be separated?

A

Can

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7
Q

What kind of bonding consists of two non-metals?

A

Covalent

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8
Q

What kind of bonding consists of a metal and a non-metal?

A

Ionic

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9
Q

What is the gas test for Carbon dioxide (CO2)?

A

Carbon dioxide turns limewater milky.

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10
Q

What happens to valence electrons, when the ionic bonding occurs?

A

They are being transferred between the atoms

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11
Q

What kind of bonding would lead to the occurrence of carbon dioxide?

A

Covalent

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12
Q

What kind of bond is created between a non-metal and a noble gas?

A

Covalent

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13
Q

What kind of ions does an ionic bond generate?

A

Oppositely charged ions

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14
Q

What kind of bonding occurs between two atoms of elements close to each other in the periodic table?

A

Covalent

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15
Q

A compound has different properties than the elements that react to form it. (True - False)

A

True

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16
Q

Element, compound or mixture?

2Cu

A

Element

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17
Q

Element, compound or mixture?

H20

A

Compound

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18
Q

Element, compound or mixture?

Salt water

A

Mixture

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19
Q

What is being shared between the atoms, when the covalent bonding occurs?

A

Electrons

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20
Q

True or false? Bases change litmus paper to blue.

A

True

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21
Q

What happens to valence electrons, when the ionic bonding occurs?

A

They are being transferred between the atoms

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22
Q

True or false? The chemical formula for sodium hydroxide is NaH.

A

False (NaOH)

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23
Q

What kind of bonding would lead to the occurrence of carbon dioxide?

A

Covalent

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24
Q

True or false? Sodium hydroxide is known as a weak base.

A

false

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25
True or false? A cation is an ion with more protons than electrons, giving it a positive charge.
True
26
Which element is using in party balloons?
Helium
27
What is the structure of an atom?
the atom has a nucleus formed by protons and neutrons, being also surrounded by electrons in orbits.
28
What are atoms?
Atoms are smallest particles which can group together, forming molecules finally they form objects. They distinct as: protons, neutrons and electrons.
29
What are the charges of the different known atoms?
protons – positive; neutrons – do not have; electrons – negative.
30
o What is matter?
matter is defined as anything that has mass, can be seen and touched. Normally separated in 3 major states: Solid, Liquid and Gas.
31
What kind of alkali metal ion / cation is present when the flame colour turns crimson red?
Lithium, Li+
32
What kind of alkali metal ion / cation is present when the flame colour turns Lilac?
Potassium , K+
33
What kind of alkali metal ion / cation is present when the flame colour turns green / blue?
Copper , Cu²+
34
What gas is present when: A lighted wooden splint makes a popping sound in a test tube of hydrogen?
Hydrogen , H2
35
What gas is present when: A glowing wooden splint relights in a test tube?
Oxygen , O2
36
What is the gas test for Ammonia (NH3)?
Makes damp red litmus paper turn blue... (Ammonia forms a white smoke of ammonium chloride when hydrogen chloride gas, from concentrated hydrochloric acid, is held near it.)
37
What gas is present when: Damp blue litmus paper turns red, and then bleaches it white?
Chlorine , Cl2
38
What is the most acidic number on the pH scale?
1
39
What is the neutral number on the pH scale?
7
40
What is the most basic number on the pH scale?
14
41
What colour does an acid with the pH of 1 turn universal indicator to?
RED
42
What colour does an alkali with the pH of 14 turn universal indicator to?
purple
43
What does it mean if an acid is corrosive?
It will destroy any substance that it comes into contact with
44
What kind of acid is produced in our muscles when we exercise?
Lactic acid
45
How do acids taste?
They taste sour
46
How do bases taste?
They taste bitter
47
What happens in ALL chemical reactions?
A new substance is formed.
48
In an exothermic reaction...
Released
49
What is the range in the pH scale?
1-14
50
All elements are solid at room temperature. (True - False)
False
51
What kind of bond is created between a non-metal and a noble gas?
Covalent
52
The table shows the melting points of different substances. Substance Melting point (°C) Sodium chloride 801 Water 100 Diamond 3730 Explain these results by referring to the structures of the substances.
- sodium chloride contains ions in a regular lattice - there are electrostatic forces of attraction between - oppositely charged ions - the forces/ionic bonds are strong - a lot of energy is needed to overcome/break these forces/bonds - water exists as simple molecules - there are weak intermolecular forces between molecules - less energy needed to overcome these forces - diamond exists as a giant covalent structure - there are covalent bonds between atoms - many strong covalent bonds - a very large amount of energy is needed to break bonds
53
what is the density formula?
p= m/V; density= mass/volume
54
What kind of ions does an ionic bond generate?
Oppositely charged ions
55
Food colourings contain a mixture of water soluble dyes. Devise a method to separate the dyes in a sample of food colouring. Explain how this method works.
- draw a horizontal line in pencil near the bottom of a piece of chromatography paper - add a spot of food colouring on the line - place the paper in a container with some water/solvent - allow the water/solvent to travel through the paper - remove the paper before the water/solvent reaches the top of the paper, and allow it to dry - the spots on the paper will indicate the number and type of dyes present - paper chromatography uses a mobile phase (the solvent/water) - and a stationary phase (contained on the paper) - forces of attraction between the dyes and these phases cause the dyes to move at different rate over the paper - depends on solubility of the dyes in mobile and static phase
56
A compound is a substance that ...
is made up of two or more elements chemically joined together
57
In an Endothermic reaction..
It takes in energy
58
Is sharpening a pencil a physical or chemical change
physical.
59
What kind of bonding occurs between two atoms of elements close to each other in the periodic table?
Covalent
60
How many elements are in Periodic Table?
118
61
During what kind of bonding can a sodium cation and a chlorine anion be created?
Ionic
62
What is the formula for relative atomic mass?
Ar
63
How many moles are in 25.0 grams of water?
1.39 mol H2O
64
How many grams are in 4.500 moles of Li2O? (the 2 should be a small one after Li)
134.6 g Li2 (small two)
65
What is the relative atomic mass of carbon? Use a periodic table if its help you!
12
66
What is the relative formula mass of carbondioxide?
44
67
What name is given to the number of atoms in a mole of an element?
Avogadro’s constant
68
What volume does 1.5 moles of hydrogen gas occupy at room temperature and pressure?
36dm3
69
How many moles are in 9 g of water
0.5 moles
70
What is the relative formula mass of ammonium nitrate, NH4NO3? (small 4 and 3)
80
71
What is element and example?
An element is a substance that is made entirely from one type of atom. Ex: Potassium .
72
Give 3 examples of elements.
hydrogen, oxygen, carbon
73
What is the periodic table symbol for the element sodium?
Na
74
What is the symbol for Magnesium?
Mg
75
Which of the following defines the identity of an element?
Number of protons
76
Name this element? : Be
Beryllium
77
You can separate all mixtures by filtration. (True - False)
False
78
Would it be possible to have a mixture made of all carbon atoms and compounds with only carbon atoms?
Yes
79
All mixtures are defined as "heterogeneous." (True - False)
False
80
Mixtures are generally separated by what methods? | (Physical - Chemical) ?
Physical

Double Chemistry (1 decks)

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