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WorksheetsChemical reactions
Total questions: 8
Worksheet time: 4mins
Noble gases are inert because they have completed outer electron shells. Which of these elements isn't a noble gas?
Chlorine
Helium
Argon
Neon
Water-based liquids can be described as acidic, neutral, or basic, with respect to pH. Which of these describes milk?
Strongly acidic
Neutral
Slightly basic
Slightly acidic
The atomic number of Nobelium is:
97
101
102
99
The symbol Sb stands for stibnum or stibnite. What is the modern name of this element?
Arsenic
Antimony
Tin
Seaborgium
Water decomposes to oxygen gas and hydrogen gas. If you had 36 grams of water and produced 32 grams of oxygen, how much hydrogen would be produced?
36 g
18 g
32 g
4 g
When an exothermic reaction takes place, the reaction mixture gets hotter because
in an exothermic change the products contain more ‘stored’ energy than the reactants.
energy is always released in a chemical change that makes new substances.
exothermic changes always produce gases.
more energy is released when new bonds are formed than is needed to break the bonds in the reactants.
Sodium hydroxide is a strong base commonly found in cleaning agents. Which of the following solutions could be used to safety neutralises a sodium hydroxide chemical spill?
Ammonia — pH = 8
Citric acid — pH = 4
Potassium hydroxide — pH = 11
Water — pH = 7
Which of the following processes is an example of a chemical reaction?
An iron rusts in a damp environment.
A mist forms when you breathe out onto cold glass
Ice melts as you hold it in the palm of your hand
A litre of water boils dry in a saucepan
