structure of an atom
Name the subatomic particle that has a positive charge.
Proton
What does it mean when at element is pure?
Every one of its atoms is exactly the same/made of just one type of atom.
What is weather?
The state of the atmosphere and its changes in a short amount of time.
There are two periods that make up an ice age, what are the names of these two periods?
Interglacial and glacial
is the earth in an ice age now?
yes
what are the 3 subatomic particle that make up an atom?
Any order:
Proton, electron, neutron
what is the measure of the purity of gold?
Carat
what is the definition of climate?
The weather of an area over a long period of time.
how many ice ages do scientist think there have been on earth?
5
Name two countries that are in the tropical climate zone.
Belize, Costa Rica, El Salvador, Guatemala, Honduras, Nicaragua, Panama.
Antigua and Barbuda, Bahamas, Barbados, Cuba, Dominica, Dominican Republic, Grenada, Haiti, Jamaica, St. Kitts and Nevis, St. Lucia, St.
Vincent and the Grenadines, Trinidad and Tobago.
Bolivia, Brazil, Colombia, Ecuador, Guyana, Peru, Suriname, Venezuela.
Cameroon, Central African Republic, Democratic Republic of the Congo, Equatorial Guinea, Gabon, Republic of the Congo, Sao Tome and Principe.
Burundi, Comoros, Djibouti, Eritrea, Ethiopia, Kenya, Madagascar, Rwanda, Seychelles, Somalia, Tanzania, Uganda.
Benin, Burkina Faso, Cabo Verde, Cote d'Ivoire, Gambia, Ghana, Guinea, Guinea-Bissau, Liberia, Mali, Niger, Nigeria, Senegal, Sierra Leone, Togo
Angola, Malawi, Mauritius, Mozambique, Zambia, Zimbabwe.
Bangladesh, India (southern), Maldives, Sri Lanka Brunei, Cambodia, Indonesia, Laos, Malaysia, Myanmar, Philippines, Singapore, Thailand, Timor-Leste, Vietnam Fiji, Kiribati, Marshall Islands, Micronesia, Nauru, Palau, Papua New Guinea, Samoa, Solomon Islands, Tonga, Tuvalu, Vanuatu.
which sub atomic particle has the smallest mass?
Electrons
a silver ring is marked with 900, what is its percentage purity?
calculation:
(900/1000)x100
= 90%
Name three factors that affect weather.
choose 3 from:
Temperature, humidity, cloudiness, precipitation, visibility, wind
how were some of the boulders in part of the world carried to their strange possitions?
They were carried thereby ancient glaciers that would then melt as the temperature increased and leave the boulder behind
which two subatomic particles form the nucleus?
proton and neutron
the size of the negative charge of an electron is exactly the same as the size of the positive charge of a proton.
What is the overall charge of an atom?
The overall charge is neutral.
in a reaction, why is it usually difficult to obtain a pure product?
In most reaction there is more than one product, so these products need to be separated and purified to produce whichever pure product you want.
(accept varying answers)
what climate do we in South Africa live in?
Mediterranean
Why do animals and plant decay slowly in a peat bog?
Peat bogs have poor oxygen and are slightly acidic which causes things to decay slowly.
Diamonds are made of carbon atoms. If some of the carbon atoms are replaced boron what will the colour of the diamond be?
Blue
What is the name of the attractive force between the positive and negative particles of an atom?
electrostatic attraction
if you take 1000g of seawater, 35g of it is made up of salts.
68% of that 35g is sodium chloride.
what is the mass of sodium chloride?
Give extra time to calculate this answer.
calculation:
(68/100)x35
= 23.8g
What are the 6 climate zones?
Polar, Temperate, Arid, Tropical, Mediterranean, mountains/tundra/taiga
scientists use an instrument called an auger to remove a core from a peat bog. They collect pollen from different parts of the core.
how can they use this pollen to figure out the climate of that area over many years?
pollen is only released from plants that can live in certain climates. If they find pollen from a plant that only grow in hot temperatures that means that the climate was hot. If the pollen is from a plant that only grows in cold climates it means that the climate was colder.
accept variations of this answer
What famous experiment did Rutherford conduct that allowed him to discover the nucleus of an atom?
The gold foil experiment