Chemistry Ka1 Flashcards Preview

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Flashcards in Chemistry Ka1 Deck (17):
1

What are the reactants from this equation? :

Citric acid + sodium carbonate --> sodium citrate + water + carbon dioxide

Citric acid + sodium carbonate

2

What are the products from this equation? :

S + O2 --> SO2

SO2

3

Balance this equation :

CH4 + O2 --> CO2 + H2O

CH4 + (2)O2 --> CO2 + (2)H2O

4

What does the Mr mean?

Relative formula mass

5

What is the Mr of NH3

1x14 + 1x3 = 17

6

What is the Mr of : Ba(OH)2

1x137 + 17x2 = 171

7

What is the Mr of Ca(NO3)2

40x1 + 2 (14+(3x6)) = 164

8

Sodium hydrogencarbonate --> carbon dioxide + water + ???

Sodium carbonate

9

What does thermal decomposition mean?

Using heat to break something down

10

What is oxidation?

When something reacts or joins with oxygen

11

What is uncertainty?

Some doubt with a measurement

12

The volume of a gas produced in a reaction was measured 5 times. The results are 82, 77, 78, 96 and 80cm3. Find the mean value and it's uncertainty

Anomalous = 96
Mean volume= (82+77+78+80) /4 = 79
Highest value= 82 (three values bigger than 79
Lowest value= 77 (2 values lower than 79
Uncertainty = +_ 3cm3

= 79 +_ 3cm^3

13

If the Mr of CaCO3 = 100, then how many moles are there?

100g

14

How do u work the Mr, no. Moles and mass of a substance

Mass of substance = no.moles x Mr

15

If the mass of 2Mg + O2 and 2MgO is 80g then what does this state

The law of conservation of mass states the mass of reactants = mass of products

16

Find the mass of ammonia when 7g of nitrogen reacts with hydrogen gas : N2+3H2 --> 2NH3

N2 + 3H2 ---> 2 NH3

Q. 7g(k) ?mass
M. 1 2
Mr. 28 17
M. 1x28=28 17x2 = 34

R. 28/28= 1 34/28= 1.2142857
A. 1x7 = 7 1.2142857 x 7 = 8.5g

17

Find the mass of zinc needed to react with oxygen to make 8.1g of zinc oxide : 2Zn + O2 --> ZNnO

6.5g