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Chemistry Yr 9 > C1 - Chemistry > Flashcards

C1 - Chemistry Flashcards

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1
Q

What are the properties of a chemical change

A

A chemical change makes new products and is almost impossible to reverse and if not impossible, it is extremely difficult. The bonds between particles also break and new bonds are formed.

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2
Q

What are the properties of a physical reaction?

A

A physical reaction has no new products made, are easily reversible and no bonds are broken

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3
Q

What is the mean distance of an atom?

A

3.4 x 10 to the power of -9

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4
Q

What is the mean distance between 2 helium atoms?

A

6.2 x 10 to the power of -11

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5
Q

What is the ratio of distance to diameter?

A

Distance between atoms / diameter of the atom

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6
Q

What are the limitations of the particle model?

A

The forces between particles, the size of the particles and the space between particles.

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7
Q

What is an atom?

A

An atom is the smallest particle of an element that still has its chemical properties. Different elements are made from different atoms.

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8
Q

What is a molecule?

A

A molecule is made from 2 or more atoms joined together. They are joined by attractive forces called chemical bonds.

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9
Q

What is the typical size of the atomic radius of an atom and the bond length of an atom?

A

1 x 10 to the power of -10

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10
Q

What is the relative mass of a proton, neutron and an electron?

A 
Proton = 1
Neutron = 1
Electron = 0.0005
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11
Q

What is the relative charge of a proton, neutron and electron?

A 
Proton = +1
Neutron = 0
Electron = -1
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12
Q

What is inside of an atom?

A

An atom is mainly just empty space that contains negatively charged electrons, electrically neutral neutrons and positively charged protons.

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13
Q

What is the atomic mass or mass number?

A

The atomic mass is the protons and neutrons.

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14
Q

What is the atomic number?

A

The atomic number is the amount of protons.

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15
Q

What is the symbol for the atomic mass or mass number?

A

A

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16
Q

What is the symbol for the atomic number?

A

Z

17
Q

What is an ion

A

Ions are charged particles that atom(s) have lost or gained electrons

18
Q

What is an isotope?

A

An isotope is a different atomic form of the SAME element; they have the SAME number of protons but a DIFFERENT number of neutrons.

19
Q

What was John Dalton’s version of the atom?

A

It was an unpenetrable sphere and that different elements had different atoms.

20
Q

What version of the atom did J.J Thompson do?

A

He created the plum pudding model which was penetrable and had negative bits inside a positive sphere.

21
Q

What particle model is Rutherford create?

A

He said that the atom was mainly empty space that had a positive nucleus with electrons orbiting around it.

22
Q

What particle model did Bohr create?

A

He said that the electron were in fixed energy levels or shells around the nucleus.

23
Q

What is the difference form Bohr’s study of the atom to the rest of the people?

A

Bohr studied the electrons and not the nucleus.

24
Q

What is the relative atomic mass

A

The relative atomic mass is the mean mass of an atom of an element compared to 1/12 the mass of a carbon 12 atom.

25
Q

What is the relative formula mass?

A

The relative formula mass is the mean mass of unit of substance compared to a carbon 12 atom.

26
Q

What is the symbol of the relative atomic mass?

A

R.A.M or Ar

27
Q

What is the symbol for the relative formula mass?

A

R.F.M or Mr

28
Q

What is the relative formula mass usually used for?

A

For a molecule that contains multiple different atoms

29
Q

What is the empirical formula?

A

An empirical formula shows the simplest whole number ratio of the atoms of each element in a compound for example:
C2H4O2 would equal to CH2O

30
Q

What is room temperature?

A

25 degrees Celsius

31
Q

In a graph question what would the 4 marks be

A

The size of the graph (3/4 of the page)
Accurate plotting
Line of best fit
Labelling X and Y axis

Chemistry Yr 9 (3 decks)

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