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Weekly science quiz > Term 1 revision > Flashcards

Term 1 revision Flashcards

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Biology 101 flashcards
1
Q

Which subatomic particle was discovered by JJ thomson?

A

Electron

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2
Q

What is the name of the atomic model that was proposed by JJ thomson?

A

Plum pudding

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3
Q

Describe the plum pudding model?

A

The atom was a sphere of positive charge with negatively charged electrons scattered around the atom

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4
Q

What did Ernest Rutherford direct at a thin gold leaf in 1905?

A

Alpha particles

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5
Q

most alpha particles going straight through the gold foil tells us that

A

the atom is mostly empty space

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6
Q

what did Neils bohr add to the Rutherford atomic model

A

electrons orbited the nucleus at specific distances

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7
Q

who discovered the neutron in 1932?

A

James Chadwick

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8
Q

How many times bigger is the atom compared to the nucleus?

A

10,000times

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9
Q

What is atomic number?

A

Number of protons

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10
Q

what is mass number?

A

sum of protons and neutrons in the nucleus

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11
Q

What are isotopes?

A

Atoms that have the same number of protons but different number of neutrons

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12
Q

what is the relative mass and charge of a proton?

A

Mass = 1 Charge = +1

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13
Q

What is the relative mass and charge of a neutron?

A

Mass = 1 Charge = 0

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14
Q

What is the relative mass and charge of an electron?

A

Mass = 0 charge = -1

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15
Q

In what order we’re the subatomic particles discovered?

A

First: electrons
Second:protons
Third:neutrons

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16
Q

What are group 1 elements called?

A

Alkali Metals

17
Q

What are group 7 elements called?

A

Halogens

18
Q

What are group 0 elements called?

A

Noble gases

19
Q

What is a compound?

A

A substance made of two or more elements that are chemically combined in fixed proportions e.g CO2 H2O O2 NaCl

20
Q

What is an element?

A

A substance that is made of only one type of atom. e.g H2 O2 Fe

21
Q

What is an ion?

A

Charged particles that have either gained or lost electrons

22
Q

What is the positive ion called?

A

cation

23
Q

What is a negative ion called?

A

Anion

24
Q

What is the function of the fine adjustment knob on a light microscope?

A

To adjust the focus of the microscope

25
Q

What is the function of the light source in a light microscope?

A

To direct light into viewers eyes

26
Q

Why was iodine solution added to the layer of onion cells when seen under a light microscope?

A

to stain the cells

27
Q

What is the function of nucleus?

A

Contains genetic information and control cell activities

28
Q

What is the function of chloroplast?

A

Size of photosynthesis

29
Q

What is the function of mitochondria?

A

Site of aerobic respiration

30
Q

What organelles do only plant cells have?

A

Cell wall, permanent vacuole, and chloroplast

31
Q

What is a eukaryotic cell?

A

Contain Nucleus and membrane-bound organelles

32
Q

What is a prokaryotic cell?

A

lack nucleus and membrane-bound organelles

33
Q

What is the change in sublimation?

A

Solid to gas

34
Q

why can’t steel be poured in its solid state?

A

Particles are in fixed positions

35
Q

What happens to the mass of solid steel as it melts?

A

stays the same

36
Q

Water undergoes a physical change and becomes steam. why is this a physical change?

A

The water will recover its original properties if the steam is cooled. the particles themselves stay the same

37
Q

Describe the direction of motion of the particles in a gas?

A

Random motion(all directions)

38
Q

What is temperature?

A

Measure of average kinetic energy of particles

39
Q

Where is true energy transferred to when a solid is melting?

A

To break the bonds

Weekly science quiz (2 decks)

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