Atoms, elements and compounds

This question is about elements and compounds.

What is the name of the compound with the formula ZnBr₂?

Use the periodic table.

Tick () one box.

A compound has the formula C₂H₆O

Table 1 shows information about a molecule of C₂H₆O

Complete Table 1.

Use the periodic table.

Potassium and sulfur react to produce potassium sulfide.

Write the word equation for this reaction.

Aluminium reacts with fluorine to produce aluminium fluoride.

Balance the equation for this reaction.

This question is about elements, compounds and mixtures.

Figure 1 shows diagrams which represent the atoms and molecules in different substances.

Which diagram in Figure 1 represents a pure compound?

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Which diagram in Figure 1 represents a mixture of an element and a compound?

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Elements are metals or non-metals.

Figure 2 shows an outline of the periodic table.

The periodic table is divided into sections.

Where are metals found in the periodic table?

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Which two of the following are typical properties of a transition metal?

Tick () two boxes.

Potassium and chlorine react to produce potassium chloride.

An atom of potassium loses an electron to form a potassium ion.

An atom of chlorine gains an electron to form a chloride ion.

Complete the dot and cross diagram.

Mixtures are separated by different methods.

Figure 3 shows the apparatus for separating four different types of mixture.

Figure 3

Which apparatus could be used to collect water from sodium chloride solution?

Use Figure 3.

Tick () one box.

Which apparatus shows filtration?

Use Figure 3.

Tick () one box.

This question is about atoms. Atoms contain three types of particle:

• electrons

• neutrons

• protons.

Which particle has no electrical charge? Tick (✓) one box.

Which particles have the same relative mass? Tick (✓) one box.

The formula of a compound is N₂O How many of each type of atom are in one molecule of N₂O?

An atom of element Z contains:

• 3 electrons

• 4 neutrons

• 3 protons.

Give the name of element Z. Use the periodic table.

Complete Figure 1 to show the position of the particles in an atom of element Z. Use the symbols: = electron = neutron = proton

This question is about atoms.

Figure 1 represents an atom of an element.

Draw one line from each name to the correct label.

An atom of element Y has:

• an atomic number of 9

• a mass number of 19.

Give the number of electrons and the number of neutrons in this atom.

Choose answers from the box.

Table 1 shows information about two isotopes of element Z.

Suggest the identity of element Z.

Use the periodic table.

Complete the sentence.

Choose the answer from the box.

Isotopes of the same element have different mass numbers because the isotopes

This question is about elements, compounds and mixtures.

Which type of substance is hydrogen?

Tick (✓) one box.

The diagrams in Figure 2 represent different substances.

represent atoms of three different elements.

Use Figure 2 to answer questions 02.2 and 02.3.

Which diagram represents a mixture of compounds?

Which diagram represents a mixture of elements?

Substances can be separated from mixtures by using different methods.

Complete the sentence.

Sand can be separated from a mixture of sand and water by

A mixture of four liquids was fractionally distilled.

Figure 3 shows the apparatus used.

Table 2 shows the boiling points of the four liquids in the mixture.

Which liquid in Table 2 would distil and be collected in the beaker first?

Suggest what would happen to the temperature of the water as the water flows through the condenser.

Describe how to obtain sodium chloride crystals from sodium chloride solution by crystallisation.

This question is about elements, compounds and mixtures.

Substance A contains only one type of atom.

Substance A does not conduct electricity.

Which type of substance is A ?

Tick (✓) one box.

Substance B contains two types of atoms.

The atoms are chemically combined together in fixed proportions.

Which type of substance is B ?

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What is the name of the elements in Group 0 of the periodic table?

Tick (✓) one box.

Which statement about the elements in Group 0 is correct?

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Neon is in Group 0.

What type of particles are in a sample of neon?

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Figure 1 represents part of the structure of an oxide of a metal.

Determine the empirical formula of this oxide.

Empirical formula = XO___

A nanoparticle of a metallic element is a cube.

Figure 2 shows a diagram of the nanoparticle.

The surface area of a cube is given by the equation:

surface area = length of side² × 6

Calculate the surface area of the cube in Figure 2.

Give your answer to 2 significant figures.

Fine and coarse particles of the metallic element are also cubes.

The length of a fine particle cube is 10 times smaller than the length of a coarse particle cube.

How does the surface area to volume ratio of the fine particle cube compare with that of the coarse particle cube?

Tick (✓) one box.

This question is about elements in Group 1.

A teacher burns sodium in oxygen.

What is the name of this type of reaction?

Tick one box.

The teacher dissolves the product of the reaction in water and adds universal indicator.

The universal indicator turns purple.

What is the pH value of the solution?

Tick one box.

The solution contains a substance with the formula NaOH

Give the name of the substance.

All alkalis contain the same ion.

What is the formula of this ion?

Tick one box.

A solution of NaOH had a concentration of 40 g/dm³

What mass of NaOH would there be in 250 cm³ of the solution?

The melting points of the elements in Group 1 show a trend.

Table 6 shows the atomic numbers and melting points of the Group 1 elements.

Plot the data from Table 6 on Figure 11.

Predict the melting point, X, of rubidium, atomic number 37

Use Figure 11.