science Flashcards
test revision
1
Q
how do you find time
A
D divided by s
2
Q
how do you find distance
A
s times t
3
Q
what causes magnets to attract and repel
A
ther are invisible magnet fields made by the movement of electrons
Hyperactivity of the electrons
4
Q
What is electromagnets
A
core of magnetic metal sourounded by a coil
5
Q
what do you do to make an electro magnet more powerfull
A
more voltage
More coils
6
Q
what happens when metal reacts with acid
A
metal+acid—-salt+hydrogen
7
Q
how can you tell if something is more reactive than anouther
A
the more vigorously it reacts with other substances
8
Q
which metals are reactive and which are not
A
alkali metals-reactive
Acid- non reactive
9
Q
naming salts for hydrochloric sulfuric and nitric acids
A
hydrochloric- chloride salt
Nitric- nitrate salts
Sulfuric- sulfrate salts
10
Q
A
