C3.1 moles and chemical reactions Flashcards
What charge do elements in Group 2 have?
2+
What are the transition metals?
The block of elements between Group 2 and 3
What charge do transition metals produce?
2+
All transition metals have the same charge except?
Iron and silver
What is the law of conservation of mass?
Mass cannot be created or destroyed by chemical reactions
If the mass appears to increase after a reaction, why could this be the case?
Reacting with oxygen in the air
What is the half equation when Na+ loses an electron?
Na = Na+ + e-
What are spectator ions?
In the reaction mixture but do not take part in the reaction
How do you detect carbon dioxide?
Using lime water, it turns cloudy white when carbon dioxide is bubbled through
How do you detect chlorine?
Blue litmus paper turning red then white
How do you detect oxygen?
Glowing split relight
How do you detect hydrogen?
Squeaky pop test
1 Litre is equal to 1…?
dm
1 millimetre is equal to 1…?
cm
How do you get from cm to dm?
divide by 1000
How do you get from dm to cm?
Multiply by 1000
How do you work out concentration with: dm ( volume) and g (mass)
Mass/volume
What is Avogadro constant?
6.02 x 10²³
How do you work out moles?
Mass/Mr
What is the limiting reactant?
The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.
How can you detect carbon dioxide?
WIth limewater, if it goes cloudy white, carbon dioxide is present
How do you detect chlorine?
Damp blue litmus paper, it turns red then white when held above chlorine
How do you detect oxygen?
Relit glowing split
How do you detect hydrogen?
Squeaky pop test
How do you calculate concentration?
Mass/volume
What is 1 litre equal to?
1 dm
What is 1 millilitre equal to?
1 cm
How do you convert from cm to dm?
Divide by 1000
How do you convert from dm to cm
Multiply by 1000
What is Avogadro constant?
6.02 x 10^23
How do you work out Moles?
Mass/Mr
What is the limiting reactant
The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.
