Starter quiz
- What is a group in the periodic table?
- A row of elements with the same number of electron shells.
- A column of elements with the same number of electrons in their outer shell. ✓
- A row of elements arranged by increasing atomic number.
- A column of elements with the same number of protons.
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- Which of the following statements correctly describes a chemical reaction?
- Elements are arranged based on atomic mass.
- Substances interact to form new products. ✓
- No new substances are formed.
- It involves only physical changes.
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- A solution with a pH of 5 is ...
- acidic. ✓
- basic.
- alkaline.
- neutral.
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- Which of the following statements correctly describes an acid?
- It turns blue litmus paper red. ✓
- It feels slippery to the touch.
- It turns red litmus paper blue.
- It reacts with bases to form water and a salt. ✓
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- Which element is in Group 1 and Period 2 of the periodic table?
- 'lithium' ✓
- Match the following types of reactions to their descriptions.
- neutralisation⇔An acid reacts with a base to form a salt and water. ✓
- combustion⇔A substance reacts with oxygen, releasing energy. ✓
- displacement⇔An element replaces another in a compound. ✓
- decomposition⇔A single compound breaks down into two or more simpler substances. ✓
Exit quiz
- Which of the following statements about Group 1 metals are correct?
- They are hard metals.
- They have lower densities than other metals. ✓
- They become more reactive down the group. ✓
- They do not react with water.
- They form acidic solutions when reacting with water.
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- Group 1 metals are also known as the ______ metals.
- 'alkali' ✓
- Group 1 metals react with water to form an ______ solution and hydrogen gas. They do not produce oxygen or acidic solutions.
- 'alkaline' ✓
- Starting with the least reactive, sort the following Group 1 metals into order of increasing reactivity with water.
- 1⇔lithium
- 2⇔sodium
- 3⇔potassium
- True or false? Sodium, calcium and potassium react with water or an acid to produce a solution with a pH greater than 7.
- True ✓
- False
- Group 2 metals react with dilute acids to form a salt and ______ gas.
- 'hydrogen' ✓
Worksheet
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Presentation
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Video
Lesson Details
Key learning points
- The properties of elements in each group in the periodic table change gradually down the group.
- Group 1 metals are all soft metals with lower densities than other metals, and become more reactive down the group.
- Group 1 metals react with water to form an alkaline solution and hydrogen, which is why they are called alkali metals.
- Group 2 metals react with dilute acids to make a salt plus hydrogen gas.
- Group 2 metals get more reactive as you go down the group, but are less reactive than Group 1 metal on the same period.
Common misconception
Group 2 metals are more reactive than Group 1 because reactivity increases across the groups.
Group 1 metals are more reactive with water; reactivity increases down a group (for Group 1 and 2), not along a period.
Keywords
Alkali - is a soluble base and has a pH of greater than 7.
Alkaline - a substance has the properties of an alkali, or contains an alkali. It is often used to refer to solutions of soluble bases with pH greater than 7.
Group - is a column on the periodic table that corresponds to the number of electrons in the outer shell of an atom.
Period - is a horizontal row on the periodic table. Each period corresponds to a number of shells of electrons in an atom of an element.
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