Particle models (heating etc) (topic 14)

Question 1

What is the definition of specific heat capacity?

Answer 1

the energy required to raise the temperature of 1 kg of a substance by 1’C

Question 2

What is the equation to work out energy required to heat an object by a certain degree

Answer 2

mass x specific heat capacity x temperature change

Question 3

What is the equation of density and definition?

Answer 3

mass/volume

the mass of a certain volume of substance

Question 4

What happens to density when an object increases in temperature?

Answer 4

Density decreases

Question 5

What happens to the pressure when the volume of the same mass increases?

Answer 5

Decreases because the particles have more room

Question 6

What is absolute 0?

Answer 6

-273 Celsius or 0 kalvin

Question 7

How do you convert from Celsius to kalvin?

Answer 7

+273

Question 8

What is the equation to work out pressure?

Answer 8

force/area

Question 9

WHat is the equation for working out pressure of a fluid?

Answer 9

height x density x 9.81

Question 10

What is upthrust ?

Answer 10

the difference between the pressure above and the pressure below

Question 11

What is the atmospheric pressure?

Answer 11

100,000 pascals

Question 12

What is the unit of pressure?

Answer 12

pascals

Question 13

What is elastic deformation?

Answer 13

When an object will return to its original shape after being stretched

Question 14

inelastic deformation?

Answer 14

when an object wont return to its original shape after being deformed

Question 15

how do you work out force on a spring?

Answer 15

spring constant x extention

Question 16

What does the gradient of a force extension graph show?

Answer 16

its the spring constant

Question 17

How do you work out the energy transferred in stretching?

Answer 17

0.5 x spring constant x extension2

Question 18

What is latent heat?

Answer 18

The heat energy that is taken in or given out by a substance when it changes state

Question 19

What is the equation to work out specific latent heat?

Answer 19

mass x specific heat capacity

Question 20

What did j.j Thomson do to progress the atomic model?

Answer 20

He discovered electrons with cathode rays. He was the first scientist to show that atoms are made of smaller sub atomic things. He came up with t.he plum pudding model

Question 21

What did Ernest Rutherford do to progress the atomic model?

Answer 21

Published results from his gold leaf experiment which consisted of firing a beam of alpha particles at a thin piece of gold. He found many particle bounced back leading him to decide there has to be a very dense nucleus at the centre.

Question 22

What did James Chadwick to do progress the atomic model?

Answer 22

He showed that gamma radiation could be explained by a neutral particle. He performed numerous experiments, bombarding elements with these particles. From this he was able to measure the mass of this neutral particle. He called it a neutron.

Question 23

What is the relative atomic mass?

Answer 23

the number of protons + neutrons

Question 24

What is the atomic number?

Answer 24

Number of protons

Question 25

What is the emission spectrum?

Answer 25

It is a spectrum of light caused by electrons in excited (high energy) gases moving up an energy level and then moving back down to a more stable level by releasing light.

Question 26

what is the absorption spectrum?

Answer 26

Some of the light emitted from emission spectra is absorb by gases in the atmosphere of the star, from this we can work out what gases are in that stars atmosphere.