Test 1 Flashcards
(22 cards)
All living organisms are made of ____.
Cells
What is an observation?
When looking at something in detail.
What is an element?
An element is a substance that can not break down into different substances.
What is a joint?
A part of the skeleton where two bones join together.
Is carbon dioxide a compound?
Yes.
What will happen to girls during puperty?
Breasts develop
Periods start
What will happen to boys during puperty?
Testes produce sperm
Voice deepens
What will happen to girls and boys during puperty?
Pubic hair grows
Growth spurt
State one example of an organ.
Brain,heart,lungs,stomach,kidney,bladder,intestine,liver
pH 1 is the strongest ___.
Acid.
pH 7 is ___.
Nuetral.
What is an universal indicator?
It is a mixture of different dyes.
State what an endothermic change is.
The surroundings transfer energy to substance.
State what happens during fertilisation in plants.
The nucleus of the pollen grain joins the nucleus of the ovule.
What is the periodic table?
It lists the elements.
Write down the chemical symbol of gold.
Au
What is an atom?
An atom is the smallest part of an element that can exist.
State what a compound is.
A compound is a substance made up of 2 or more substances.
State what happens to the atoms in a chemical reaction.
Make new substances
Transfer energy to or from the surroundings.
Why are chemical reactions useful?
It is because they can make useful substances. such as medicine,fabrics and building materials.
State what a decomposition reaction is.
A chemical reaction in which a compound breaks down to form simpler compound or elements.
State one difference between a base and an alkali.
A base is a substance that neutralises an acid.
An alkali is a soluble base.
