Numbers you need to know for Science

Atmospheric pressure?

100,000Pa

Density for fresh water?

1. 1000kg/m3

2. 1g/cm3

Density of sea water?

1030kg/m3

Density of air?

1.3kg/m3

Gravitational field strength on Earth?

10N/kg

Acceleration due to gravity on Earth?

10m/s2

Gravitational field strength on Mars?

3.7N/kg

Acceleration due to gravity on Mars?

3.7m/s2

Gravitational field strength on The Moon?

1.6N/kg

Acceleration due to gravity on The Moon?

1.6m/s2

Specific heat capacity of water?

4200 J/Kg*C

Specific heat capacity of ice?

2100J/kg*C

Specific latent heat of change from ice to water?

340000J/kg

Specific latent heat of change from water to steam?

2260000J/kg

Mains electricity in homes?

230V

Mains frequency in homes?

50Hz

Voltage that homes and offices receive from the national grid?

230V

Voltage that hospitals and schools receive from the national grid?

11,000V

Voltage that large factories receive from the national grid?

33,000V

Speed of sound in air?

330m/s

Speed of sound in water?

1500m/s

Speed of sound in steel?

5000m/s

What is the range of human hearing?

20Hz to 20000Hz

Speed that all electromagnetic waves travel in a vacuum?

3.0 x 10*8 m/s

Critical angle in glass?

42*C

Ideal conditions in the Haber process?

1. 200atm pressure

2. 450*C

3. Iron catalyst

Avagadro's constant?

6.02 x 10*23 mole

What multiple is tera(T)?

10*12

What multiple is giga(G)?

10*9

What multiple is mega(M)?

10*6

What multiple is kilo?(K)?

10*3

What multiple is centi(C)?

10*-2

What multiple is milli(M)?

10*-3

What multiple is micro(µ)?

10*-6

What multiple is nano(N)?

10*-9

What multiple is pico(P)?

10*-12

What multiple is femto(F)?

10*-15

What does magnesium carbonate/calcium carbonate yield?

1. Magnesium oxide + carbon dioxide

2. Calcium oxide + carbon dioxide

What does cracking of a alkane release?

Ethene + 1 other alkane(based on subtraction)

How can we tell if a reaction is incomplete combustion?

1. They will provide us carbon/carbon monoxide in the products

2. We would just have to fill it out.