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Which liquid is NOT an acid: bi-carb of soda, vinegar or lemon juice?
bi-carb of soda
Are cleaning products usually acids or bases?
Bases
What is another name for 'base'?
alkaline
What colour do bases turn to, when they are tested?
blue
Give TWO examples of liquids that are measured as 7 (neutral)
water and blood
Which liquids are measures 1-6 on the pH scale?
acids
What is covalent bonding?
When two or more atoms share electrons to become stable.
What is ionic bonding?
When two or more atoms give or take electrons to become stable.
When atoms bond together, what do they share, take or give away?
electrons
When atoms bond together, what do they become?
compounds
What does the number 2 mean?
The number of electrons in its outer shell.
How many electrons does Oxygen have?
Oxygen has 8 electrons.
What is Oxygen's mass?
15.9994
What does the number 8 mean for oxygen?
8 is its atomic number
Why do the electrons remain close to the nucleus (protons and neutrons)?
Because electrons are negatively charged and the nucleus is positively charged. This makes each part attracted to each other.
What do we call protons, neutrons and electrons?
sub-atomic particles
What is this part of the atom called?
protons
What is this part of the atom called?
the outer shell
What is this part of the atom called?
neutrons
What is this part of the atom called?
electrons
Which state of matter has a no fixed shape but has a fixed volume?
a liquid
Which state of matter has a fixed volume, shape and mass?
a solid
Which state of matter has no fixed volume or shape?
a gas
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