Balance the equation
19 12 14
18 12 14
16 14 12
19 14 12
How to test oxygen gas?
use glowing splint
add ethane to burn
lime water turns milky
Which method can test chlorine
use damp red litmus paper
add lime water
use damp blue litmus paper
add NaOH solution
Which separation method uses boiling points?
Filtration
distillation
chromatography
decanting
In this reaction, which compound is the reducing agent?
Aluminium, it gains oxygen
iron, it gains oxygen
Aluminium, it loses electrons
iron(III) oxide, it loses oxygen
Phenolphthalein in KOH solution turns:
Pink
red
yelow
orange
In experiment of measuring enthalpy.Why using polystyrene cup rather than using glass beaker.
plastic is lighter than glass
reduce heat loss
glass beaker may broke under high temperature
Which element is a liquid at room temperature?
Bromine
Chlorine
Diamond
Methane
What is the flame color for potassium ions?
Lilac
purple
red
blue
What is the flame color for calcium ions?
Lilac
orange
yellow
blue
Give the method of testing for pure water.
Heat it
Cool it
measure the boiling point
add anhydrous CuSO4
Sodium chloride has a higher melting point than hydrochloride because
It has covalent bonds
It is polar compound
It forms giant ionic structure
It has higher Mr
which group does Z belong
Give the empirical formula of this organic compound
Sodium reacting with water produces?(formula of gas)
What is the change of solid to gas?
Crystalisation
sublimation
condensing
Freezing
Name a greenhouse gas in the atmosphere（小写英文，写英文名称）
what is the name of CH3CH2CH2CH3?
Name the noble gas that makes up about 1% of the atmosphere
Nitrogen
radon
argon
helium
What is the product of reacting methane with bromine other than bromomethane
HBr
H2
H2O
O2
State the appearance of the iron wool after one week
white
Black
Red-brown
Yellow
What is the reaction type of methane reacting with bromine?
addition
decomposition
substitution
condensation
What is the condition of reacting bromine with methane?
Radio wave
H3PO4
UV light
AlLiH4 in dry ether
Explain why incomplete combustion of C2H6cause a problem for humans?
Because C2H6 is corrosive
Because CO is produced which can reduce the ability of haemoglobin to carry oxygen
Because human are addictive to C2H6
Which element in Group 7 has the most reactivity?
chlorine
Bromine
Iodine
Fluorine
What is the color of solid iodine?
Purple
dark brown
dark grey
Black
Zn react with HNO3
Excess zinc is used as for fun
excess zinc is used to react with Zn(NO3)2
Excess zinc is used to ensure all nitric acid reacts
Excess zinc is used to make sure that H2 produces
Silicon dioxide has a strong hard structure because it is a _________ structure.
What are two observations when magnesium burns in oxygen?
Bright white flame and white powder formed
Blue flame and black residue
Green flame and gas released
No visible change
Give a reason why the student stirs the mixture?
So that the temperature of solution are same
So that the temperature will decrease very soon
So that the water can with ammonium nitrate
So that more ammonium nitrate will dissolve
What type of reaction is PbCO₃ → PbO + CO₂?
Combustion
neutralisation
displacement
thermal decomposition
脑筋急转弯：猜测图中物质名称
哈哈哈
哈哈酯
二哈醚
哈基醚
脑筋急转弯：猜测图中取代基名称（非正常）
脑筋急转弯：猜测图中物质的名称
钴磷苯
钴光苷肽
磷钴苷
磷苷钴