States of matter
What are the three states of matter?
solid, liquid, gas
What is the first element on the periodic table?
Hydrogen
Which planet's rings are made of rock and ice?
Saturn
What is the difference between a compound and a mixture?
A compound is chemically combined, while a mixture is physically combined and can be separated easily.
What is the process of a solid turning into a liquid?
melting
What is the name of the compound made from hydrogen and oxygen that is essential for life?
water H2O
Which star is the closest to Earth and is the center of our solar system?
Sun
What is mass?
Mass is the amount of matter in an object.
Which process turns gas into liquid?
Condensation
What is the name of the compound made of sodium and chlorine?
sodium chloride or salt
What is the name of the planet that has the strongest strength of gravity?
Jupiter
What gas do plants need for photosynthesis?
CO2
What happens to the energy of particles during freezing?
The energy decreases
Suggest the names of the compounds with these formulae: MgO, NaCl
magnesium oxide, sodium chloride
What is the term for the force that causes objects to fall to the ground, such as a ball dropped from your hand?
Gravity
What is the name of the galaxy we live in?
The Milky Way
What do we call the temperature at which a liquid turns into a gas?
boiling point
Write the composition of air (percentage%)
78%nitrogen
21% oxygen
1% carbon dioxide, water vapour, argon
An object weighs 250 N on Jupiter. What is its mass?
10 kg
Why do we call CO as carbon monoxide?
Because there is one oxygen atom, when there is one oxygen we use mono.