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NAT5 Chemistry > Unit 1-Chemical Changes And Structure > Flashcards

Unit 1-Chemical Changes And Structure Flashcards

1
Q

what is everything in the universe made up of?

A

118 elements

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2
Q

what are variables?

A

they are something that can be changed in a chemical reaction

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3
Q

what are some examples of variables?

A

-temperature
-particle size
-concentration
-volume
-mass

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4
Q

what is a fair test?

A

a fair test is when you change only one variable at a time during a chemical reaction

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5
Q

what are the factors which would make a reaction slow?

A

-large particles
-low concentration
-low temperature

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6
Q

what are the factors which would make a reaction fast?

A

-small particles
-high concentration
-high temperature

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7
Q

what must happen for a chemical reaction to occur?

A

the reactant particles must collide

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8
Q

what does collision provide?

A

collision provides the energy to break the bonds in the reactant molecules and form the new bonds in the product

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9
Q

what is a successful collision?

A

it is a collision which results in a chemical reaction, as not all collisions result in a chemical reaction

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10
Q

what must the particles collide with in order for a collision to be successful?

A

-the correct geometry
-sufficient energy

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11
Q

what does any factor which increases the number of collisions between reactant particles increase?

A

it increases the rate of reaction

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12
Q

what also increases as the surface area increases?

A

the area for collisions

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13
Q

what will increase if you increase the concentration of the reactants?

A

the number of collisions

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14
Q

what does low concentration equal?

A

low conc. = few collisions

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15
Q

what does high concentration equal?

A

high conc. = more collisions

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16
Q

what happens as temperature increases?

A

-the amount of energy a particle has increases
-the faster the particle moves around
-the more likely particles are to collide
(all of these things lead to a increase in the rate of reaction)

17
Q

what is temperature a measure of?

A

it is a measure of the average kinetic energy

18
Q

what do all chemical reactions produce?

A

new substances

19
Q

how can you find the speed of a reaction?

A

by measuring how fast the new substance is formed

20
Q

how much of the graph paper must you use?

A

more than half

21
Q

what is a catalyst?

A

a catalyst is a substance which speeds up the rate of a chemical reaction but can be recovered chemically unchanged at the end of a reaction.

NAT5 Chemistry (9 decks)

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