Chemistry Chapter 5 Quiz

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Questions and Answers

What term is used to describe a mixture specifically designed as a useful product?

Formula

Fraction

Formulation (correct)

Compound

In the context of chromatography, what is the purpose of the start line?

To mark the initial position of the ink sample (correct)

To separate the different components of the ink

To measure the distance traveled by the dye

To indicate where the solvent starts

If a student is investigating colors in printer ink using chromatography, what would be the best tool for drawing the start line?

Highlighter

Ruler (correct)

Pencil

Ink pen

What kind of mixtures are chromatograms used to analyze?

Heterogeneous mixtures Signup and view all the answers

What does the Rf value represent in chromatography?

Ratio of the distance traveled by the substance to the distance traveled by the solvent Signup and view all the answers

What happens to the color of anhydrous copper sulfate when water is added?

Changes from white to blue Signup and view all the answers

Which of the following best describes the nature of the reaction between anhydrous copper sulfate and water?

The reaction is reversible. Signup and view all the answers

How many atoms are present in the chemical formula CuSO4?

4 Signup and view all the answers

What color does hydrated copper sulfate turn when formed?

Blue Signup and view all the answers

Which process would cause the color change from blue back to white in hydrated copper sulfate?

Heating Signup and view all the answers

In the equation anhydrous copper sulfate + water ⇌ hydrated copper sulfate, what does the symbol '⇌' indicate?

The reaction is reversible Signup and view all the answers

What is a common physical state of chlorine under standard conditions?

Gas Signup and view all the answers

Which of the following is a characteristic result when chlorine gas is tested?

It bleaches moist litmus paper. Signup and view all the answers

What is the mass of sulfate ions dissolved in 1 dm³ of sea water?

2.7 grams Signup and view all the answers

In the provided data, which ion has the highest mass per 1 dm³ of sea water?

Sulfate Signup and view all the answers

If you were to plot a bar chart of the ion masses, which ion would be represented by the tallest bar?

Sulfate Signup and view all the answers

Which of the following is the correct order of ions based on their mass in 1 dm³ of sea water from highest to lowest?

Sulfate, Magnesium, Calcium Signup and view all the answers

A life cycle assessment (LCA) focuses mainly on which aspect of a product?

Environmental impact throughout its life Signup and view all the answers

What type of chart is suggested to represent the data from Table 4?

Bar chart Signup and view all the answers

What is the mass of magnesium ions dissolved in 1 dm³ of sea water?

1.3 grams Signup and view all the answers

Which of the following ions has the lowest mass in 1 dm³ of sea water according to the provided data?

Calcium Signup and view all the answers

What is the primary purpose of the student’s investigation?

To measure the mass of dissolved solids in various water types. Signup and view all the answers

Which step follows measuring 100 cm³ of river water?

Pour the river water into the evaporating basin. Signup and view all the answers

In the context of the experiment, why is it important to heat the evaporating basin?

To evaporate the water and isolate the dissolved solids. Signup and view all the answers

What would be the impact of using a beaker instead of a measuring cylinder to measure water volume?

A beaker could lead to larger measurement errors. Signup and view all the answers

How should the results from river water, sea water, and tap water be compared?

By analyzing the mass of dissolved solids for each type. Signup and view all the answers

What equipment is clearly the most suitable to measure 100 cm³ of water accurately?

Measuring cylinder Signup and view all the answers

What is the mass of dissolved solids found in tap water based on the experimental results?

0.1 grams Signup and view all the answers

What is the mass of aluminium packaging that is recycled in the UK each year?

143.36 million kg Signup and view all the answers

How many aluminium cans can be made from 4.00 kg of aluminium, given that each can weighs 15.8 g?

260 cans Signup and view all the answers

What percentage of steel is recycled according to the disposal methods provided?

85% Signup and view all the answers

Which method has the highest percentage for disposing of wood?

As waste Signup and view all the answers

How much wood is burnt based on the disposal percentages provided?

6% Signup and view all the answers

What is the combined percentage of wood disposed of by recycling and burning?

42% Signup and view all the answers

Considering sustainability, which material demonstrates the lowest recycling rate?

Wood Signup and view all the answers

What is the total percentage of wood that is not recycled?

64% Signup and view all the answers

What effect does increasing the temperature have on the rate of a reaction?

It increases the number of successful collisions. Signup and view all the answers

How does higher temperature affect particle movement in a reaction?

It enhances particle speed and energy. Signup and view all the answers

What is primarily affected by the number of collisions during a reaction at elevated temperatures?

The rate at which the reaction occurs. Signup and view all the answers

Which of the following statements about reaction rates is true when temperature increases?

Most reactions increase in rate. Signup and view all the answers

What role do particles play in determining the rate of reactions at varying temperatures?

The energy and collisions of particles are crucial. Signup and view all the answers

Which option best describes the relationship between particle collisions and temperature?

Higher temperatures increase the frequency of successful collisions. Signup and view all the answers

What is the effect of temperature on reactant particles in a chemical reaction?

Higher temperatures can promote the breakdown of reactant particles. Signup and view all the answers

How does increasing temperature affect the activation energy requirement of a reaction?

It decreases the activation energy needed. Signup and view all the answers

Study Notes

GCSE Combined Science: Trilogy - Chemistry Paper 2F

Materials required: Ruler, scientific calculator, periodic table (provided)
Time allowed: 1 hour 15 minutes
Total marks: 70

Question 1

Topic: Percentage of nitrogen and oxygen in the Earth's atmosphere
Nitrogen percentage: 78%
Oxygen percentage: 21%

Question 1.1

Topic: Approximate percentage of carbon dioxide (CO2) in Earth's early atmosphere
Early atmosphere CO2 percentage: 95%

Question 1.2

Topic: Reasons for decrease in CO2 percentage since the Earth's early atmosphere
Reasons: Combustion of fuels, deforestation

Question 2

Topic: Trend in carbon dioxide percentage from 1800 to 2020
Trend: Gradual increase.

Question 3

Topic: Identification of pure substance
Pure Substance: Substances that have a fixed melting point range
Reason for purity: A pure substance has a definite melting point. Impurities cause the melting range to spread over several degrees, unlike a pure substance, which melts over a small, well-defined temperature range.

Question 4

Topic: Greenhouse gases
Greenhouse gas: Methane, carbon dioxide
Environmental problem caused by greenhouse gases: Climate change

Question 5

Topic: Relative formula mass of carbon dioxide (CO2)
Relative atomic mass of C: 12
Relative atomic mass of O: 16
Relative formula mass of CO2: 44

Question 6

Topic: Different tests for identifying chemicals
Substance: Copper sulfate. Anhydrous copper sulfate changes color to hydrated copper sulfate with water
Color changes from: White/anhydrous to blue/hydrated.
Reversible reaction: The word equation shows the reaction is reversible as hydrated copper sulfate can release water and return to anhydrous copper sulfate

Question 7

Topic: The total number of atoms in a chemical formula
Formula: CuSO4
Total atoms: 6 atoms

Question 8

Topic: Tests for Identifying Gases
Gas: Chlorine
Test: Damp litmus paper
Result: Turns moist litmus paper pale.

Question 9

Topic: Types of mixtures
Mixture name: Formulation
(Further Questions on Chromatography, this section requires the image)

Question 10

Topic: Using a ruler to indicate starting point in chromatography
Reason: A ruler ensures an even start line. This is a valid method to ensure an accurate separation of substances.

Question 11

Topic: Calculating the Rf value
Rf equation: Rf = (distance moved by component) / (distance moved by solvent)

Question 12

Topic: Identification of blue dye, Rf values
Substance: Prussian blue given Rf value is closest to that found experimentally

Question 13

Topic: Safe water
Safe water name: Potable water

Question 14

Topic: Water purification methods
Two methods: Ozone, ultraviolet light

Question 15

Topic: Equipment for measuring volume of water
Equipment: Measuring cylinder

Question 16

Topic: Calculating Mass
Values: X = 3.5 g

Question 17

Topic: Identifying variables in an investigation
Control Variables: Room temperature, volume of water, mass of evaporating basin
Dependent Variable: Mass of dissolved solids/mass of evaporating basin and dissolved solids
Independent Variable: Type of water

Question 18

Topic: Calculating mass in Kilograms from a value given in millions
Values: Given 212 million kilograms and 68% recycled, the answer is 144.96 million kilograms.

Question 19

Topic: Calculate number of cans that can be made from a known weight
Value: Given 4.00 kg of aluminum, the answer is 253 cans

Question 20

Topic: Evaluating the sustainability of different waste disposal methods.

Question 21

Topic: Defining hydrocarbon
Definition: Compound containing only hydrogen and carbon.

Question 22

Topic: General formula of alkanes
General formula: CnH2n+2
Formula for 10 carbons C10H22

Question 23

Topic: Balancing chemical equations
BALANCED EQUATIONS: C14H30 → C8H18 + C6H6 (1 mark)

Question 24

Topic: Test for alkenes
Test: Bromine water
Result: - Turns from orange to colorless

Question 25

Topic: Valid methods for investigating the reaction rate of a chemical

Question 26

Topic: Effect of temperature on reaction rate
Explanations: Increasing temperature increases reaction rate due to increased kinetic energy of molecules. Frequency and force of collisions increase, thus speeding up the chemical reaction

Question 27

Topic: Definition of a catalyst
Definition: A substance that speeds up a chemical reaction without being consumed or permanently altered itself.

Question 28

Topic: Biological catalysts
Name: enzymes

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Description

Test your knowledge on chromatography and related chemical reactions in this Chemistry Chapter 5 Quiz. Answer questions about mixtures, Rf values, and the interactions between anhydrous and hydrated copper sulfate. Challenge your understanding of essential chemical concepts and processes!