2322779
Descripción
Test por julia.s.mulroone, actualizado hace más de 1 año
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Creado por julia.s.mulroone
hace alrededor de 9 años
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Pregunta 1
Pregunta
Which of these compounds is covalently bonded?
Respuesta
-
Iron oxide
-
Magnesium sulphate
-
Carbon dioxide
-
Sodium chloride
Pregunta 2
Pregunta
Which are properties of metals?
Respuesta
-
High melting and boiling points
-
Often gas at room temperature
-
Brittle; easy to break
-
Hard and shiny
-
Dense
-
Sonorous
-
Often highly reactive
-
Poor conductors
-
Good conductors
-
Malleable and ductile
Pregunta 3
Pregunta
Nitrate (NO3) has a valency of 1.
Respuesta
- True
- False
Pregunta 4
Pregunta
When phenolphthalein comes into contact with an acid, it goes bright pink/purple.
Respuesta
- True
- False
Pregunta 5
Pregunta
Which of the following increases rate of reaction?
Respuesta
-
Increasing temperature
-
Adding a catalyst
-
Decreasing concentration
-
Increasing surface area
-
Adding a barbiturate
Pregunta 6
Pregunta
Reactivity increases as you go down the Group 1 metals.
Respuesta
- True
- False
Pregunta 7
Pregunta
Which of these salts are insoluble?
Respuesta
-
Potassium nitrate
-
Barium sulphate
-
Silver bromide
-
Sodium carbonate
-
Calcium carbonate
Pregunta 8
Pregunta
Find the chemical equation for:
Hydrogen peroxide -> water + oxygen
Respuesta
-
H2O2 -> 2H2O + O2
-
H2O2 -> H2O + O
-
2H2O2 -> 2H2O + O2
-
H2O2 -> H2O + O2
Pregunta 9
Pregunta
Why is a polystyrene cup used in the experiment to find a temperature change?
Respuesta
-
Because it is safer.
-
Because it is an insulator.
-
Because it is cheaper.
-
Because it is light.
Pregunta 10
Pregunta
Which of these are halogens?
Respuesta
-
Oxygen
-
Potassium
-
Chlorine
-
Fluorine
-
Helium
-
Iodine
-
Copper
-
Bromine
Pregunta 11
Pregunta
Halogens exist as monatomic molecules.
Respuesta
- True
- False
Pregunta 12
Pregunta
Which of the following compounds are ionically bonded?
Respuesta
-
Potassium chloride
-
Sulphur dioxide
-
Copper nitrate
-
Magnesium oxide
-
Hydrogen bromide
Pregunta 13
Pregunta
The ∆H for an exothermic reaction is a negative value.
Respuesta
- True
- False
Pregunta 14
Pregunta
Which of these would you observe in the reaction between sodium and water?
Respuesta
-
Shoots around surface of the water
-
Hissing sound
-
Burns with a lilac flame
-
Effervescence/fizzing
-
Never disappears
-
Melts into a shiny ball
Pregunta 15
Pregunta
The noble gases are unreactive because they are too large and have very weak electrostatic forces.
Respuesta
- True
- False
Pregunta 16
Pregunta
What is the test for carbon dioxide?
Respuesta
-
Burns with a squeaky pop
-
Turns limewater milky
-
Relights a glowing splint
-
Bleaches paper
Pregunta 17
Pregunta
Which gas relights a glowing splint?
Respuesta
-
Carbon dioxide
-
Ammonia
-
Hydrogen
-
Oxygen
Pregunta 18
Pregunta
In the reaction between potassium chloride and iodine, iodine displaces chloride to form potassium iodide.
Respuesta
- True
- False
Pregunta 19
Pregunta
Which are properties of the halogens?
Respuesta
-
Good conductors
-
Highly reactive
-
Alkaline
-
Poisonous
-
Bleaches
-
Metals
-
Form diatomic molecules
-
Painkillers
-
Form coloured gases
Pregunta 20
Pregunta
Why does increasing temperature increase rate of reaction?
Respuesta
-
Higher quantity of particles, so there are more frequent collisions.
-
More kinetic energy, so particles collide more often and more frequently.
-
Lowers the activation energy required for reactions.
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