Whats the Matter with you
What is matter?
Everything which has mass and occupies volume
What is a chemical reaction?
A process in which one or more substances change into another or others which are different.
Which element is represented by the symbol H?
Hydrogen
What are the two main systems of matter?
Heterogeneous and homogenous
What is the sum of kinetic and potential energry called?
Mechanical Energy
What is mass?
The quantity of matter in a body/object
2 or more atoms joined together are called...
molecules
Which element has atomic number 2?
Helium
What is density?
The ratio between the mass of a body and its volume
Why do we use vectors when we work with forces?
To indicate direction
What is the smallest unit of a substance that defines what substance it is?
An atom
What does the law of Lavoisier state?
Mass cannot be created nor destroyed, only rearranged
What is the atomic number for magnesium?
12
What is concentration?
The amount of solute per unit of volume
What is heat?
The transfer of thermal energy between two bodies of different temperatures
What is an element?
A pure substance that cannot be broken down.
A scientific discipline which attempts to combat the polluting effects on the Earth’s land, water and air from harmful substances created by humans.
Enviornmental chemistry
The horizontal rows on the periodic table are called...
Periods
Why does the temperature of boiling water not change?
All the energy is used for the change of state
Define Hooke's law
The lengthening of a spring is directly proportional to the force applied
Explain how atoms are joined in solids, liquids and gases
Solids- tight together
Liquid- more spread apart
gas- far apart.
How is acid rain caused?
By human activity. When we burn fossil fuels, sulphur and nitrogen oxides are released into the atmosphere. These substances dissolve in the rainwater to form sulphuric and nitric acid
The elements in group 18 (the last column) are known as the...
noble gases
How many litres are 2.5 m3?
2500 L
If the distance between two charges is halved, the electrical force will be...
four times bigger