WorksheetsM_Quiz_1
Total questions: 15
Worksheet time: 13mins
X and Y are elements of the third period.
X and Y are individually heated in excess chlorine. Each product is purified and then separately added to water, producing two solutions. Both solutions have a pH of less than 5. What could be X and Y
Na and P
Mg and Al
Mg and Si
Si and P
An ore contains magnesium carbonate and barium carbonate. A sample of the ore is dissolved in nitric acid.
How could this solution be processed into a magnesium compound and a separate barium compound?
Add HCl (aq), filter off the solid barium chloride.
Add HCl (aq), filter off the solid magnesium chloride.
Add H2SO4 (aq), filter off the solid barium sulphate.
Add H2SO4 (aq), filter off the solid magnesium sulphate.
When calcium and calcium hydride, CaH2, react separately with water, they each produce a white solid and a colourless gas. The white solid is the same compound in each reaction.
Which statement is correct?
Both Ca and CaH2 produce H2.
Both Ca and CaH2 produce O2.
Ca produces H2 and CaH2 produce O2.
Ca produces O2 and CaH2 produce H2.
When concentrated sulfuric acid is added to solid sodium chloride, HCl is formed but not Cl2.
When concentrated sulfuric acid is added to solid sodium iodide, I2 is formed. Which statement explains these observations?
Sulfuric acid is an oxidising agent and chloride ions are more easily oxidized.
Sulfuric acid is an oxidising agent and iodide ions are more easily oxidized.
Sulfuric acid is a reducing agent and chloride ions are more easily reduced.
Sulfuric acid is a reducing agent and iodide ions are more easily reduced.
The gaseous products of heating a mixture of Ca(OH)2 and NH4Cl are passed through solid CaO. This absorbs water vapour and a gas, W, is collected.
A sample of W is oxidized by Cl2(g) to produce two gases, X and Y. X is an element. Y is acidic. Y reacts with W to produce Z. What are X and Z?
X is N2 , Z is CaCl2
X is N2 , Z is NH4Cl
X is O2 , Z is CaCl2
X is O2 , Z is NH4Cl
Plaster of Paris is chemically:
CaO
CaSO4
CaSO4.1 1/2H2O
(CaSO4)2 H2O
This element is present in insulin:
Cu
Fe
Mg
Zn
Laughing gas is a:
general anesthetic
caustic
disinfectan
local anesthetic
Most active of metallic elements:
alkali metals
oxidizing agent
base metals
solubilizing agent
Hard water does not lather with soap. This is due to:
K
Al and O
Mg and Ca
Zn and Pb
______________ + NaOH (aq) → NaCl (aq) + NH3 + H2O
ammonium nitrate, NH4NO3
ammonium sulphate, (NH4)2SO4
ammonium chloride, NH4Cl
ammonium phosphate, (NH4)3PO4
What was one thing Alchemist believe in?
The Scientist's stone
The Philosopher's stone
The Philosopher's rock
The Alchemist's stone
What were most Alchemists obsessed with?
Creating gold
Finding diamonds
Finding copper
Creating dollars
