Year 7 Homework Booklet. Name. Teacher. Elements, compounds and reactions

Size: px

Start display at page:

Download "Year 7 Homework Booklet. Name. Teacher. Elements, compounds and reactions"

Peregrine Peters
6 years ago
Views:

1 Year 7 Homework Booklet Name Teacher Elements, compounds and reactions

2 Task number Task Success criteria 1 Homework quiz- Finding elements and building the Periodic table Research and complete the questions in the homework quiz. Extension Complete a fact file on one famous scientist see homework quiz for details. 2 Homework quiz-understanding elements and atoms Research and complete the questions in the homework quiz. Extension Complete a fact file on one famous scientist see homework quiz for details. Extension Research the symbols that represent the compounds: a. Water b. Carbon dioxide c. Methane d. Hydrochloric acid e. Sulphuric acid For each compound calculate its molecular mass, remember to show all your working out. 3 Design an element cube Use the cube net template to add research about an element that your teacher has allocated to you, from the periodic table. Extension Give reasons why the element you have researched is placed in the row or specific group of the periodic table 4 Homework quiz- metals and non metals Research and answer the questions to the quiz. Extension - The Kalgoorie Super Pit

3 question! 5 Homework quiz: Oxidation Research and answer the questions to the quiz. Extension Look at the picture of an old pulley wheels used in the gold rush in the 1880 s in San Franscisco, describe what material it is made. describe the changes that have happened to it over time. explain why write an equation for the reaction 6 Metalloids Create a leaflet that explains the uses and dangers of 5 non-metals. Choose at least 3 of your non-metals from: Cl, Br, S, Ar and Ne. 7 Combustion of metals Extension- Explain why Silicon is called a semi metal and its uses. Draw a coloured picture of a firework display. Write a caption to tell how you know what the metals are in the fireworks. Extension: Write equations for the reactions occurring in your firework display.

4 Homework quiz Finding elements and building the Periodic table 1. Which are the two most abundant elements in the Earth s crust? a) Aluminium b) Hydrogen c) Iron d) Oxygen e) Silicon 2. Which are the two most abundant elements in the Sun? a) Carbon dioxide b) Helium c) Hydrogen d) Nitrogen e) Oxygen 3. People have used gold for jewellery for thousands of years but aluminium was only discovered in the year Why? a) Aluminium is a rarer than gold b) Aluminium is an unreactive metal c) Aluminium is hard to extract from aluminium compounds d) Aluminium is a man-made element 4. What is the name given to an uncombined element found naturally on Earth? a) A pure element b) A native element c) A natural element d) A metal 5. The Periodic Table contains 92 natural elements. Where do new elements come from? a) From meteorites b) From exploding stars called supernovae c) From nuclear reactors d) From chemical reactions

5 6. Why has the periodic table changed over time? Choose two answers. a) To make it easier to read b) New elements were discovered c) Mendeleev was not a good scientist d) Scientists rearranged the elements according to their chemistry 7. Which three of these elements have been named after famous scientists? a) Selenium b) Curium c) Krypton d) Mendelevium e) Einsteinium f) Caesium Extension task: For one of the elements named after a famous scientist produce a fact file on the scientist, to include: A picture Date of birth and death Place of birth How they discovered the element Any other interesting facts

6 Homework quiz Understanding elements and atoms 1. Use the diagram to help you to match the information. The atomic number for helium 20 The group number for fluorine He The mass number for neon 2 The symbol for helium Elements and compounds are different types of substance. Which two of the statements are true? a) An element only contains one type of atom b) Two elements can have the same atomic number c) A compound is made of two or more elements combined d) Compounds are not pure substances because they contain more than one element

3. Urea has the formula CO(NH 2 ) 2. It is a waste product from the body found in urine. What elements does it contain? a) Carbon b) Cobalt c) Hydrogen d) Nitrogen e) Oxygen f) Uranium 4.

7 3. Urea has the formula CO(NH 2 ) 2. It is a waste product from the body found in urine. What elements does it contain? a) Carbon b) Cobalt c) Hydrogen d) Nitrogen e) Oxygen f) Uranium 4. Nitromethane is used as a fuel for drag racers and model aircraft. It has the formula CH 3 NO 2. Match the element to the number of atoms in one molecule of CH 3 NO 2. Carbon 3 Hydrogen 1 Nitrogen 2 Oxygen 1

5. Use the information from the image to calculate the molecular mass of sulfur dioxide. Sulfur dioxide has the formula SO 2 Show how you calculated your answer.

8 5. Use the information from the image to calculate the molecular mass of sulfur dioxide. Sulfur dioxide has the formula SO 2 Show how you calculated your answer. Extension: Research the symbols that represent the compounds: f. Water g. Carbon dioxide h. Methane i. Hydrochloric acid j. Sulphuric acid For each compound calculate its molecular mass, remember to show all your working out.

9 Homework quiz Understanding metals and non metals 1. Which three of these are alloys? a) Steel b) Copper c) Tin d) Solder e) Lead f) Brass 2. Why are alloys used instead of pure metals? Choose two answers. Property Pure aluminium Pure Copper Strength (MPa) Density (g/cm 3 ) Duralumin (95% aluminium, 4% copper and 1% magnesium) Corrosion resistance Excellent Good Good a) Alloys are often stronger than pure metals b) Alloys may have more useful properties than pure metals c) Alloys are often cheaper than pure metals d) Alloys are always more corrosion resistant than pure metals 6. Which two metals might be suitable to make pans from? Metal A Metal B Metal C Metal D Metal E Density (g/cm 3 ) Melting point ( O C) Electrical conductivity Relative heat conductivity (units)

10 Reactivity Very high Moderate Low Low Low Strength (MPa) less than Other properties Reacts explosively with water Corrosion resistant Corrosion resistant Corrodes Toxic a) Metal A b) Metal B c) Metal C d) Metal D e) Metal E Explain why your choice of metals. 4. Look at the table. Element Mass number Melting point ( o C) Boiling point ( o C) Reactivity Fluorine Extremely reactive Chlorine Very reactive Bromine Reactive Iodine Reactive What happens to the reactivity as you go down the halogen group? 5. Match the states at room temperature (20 C) to the halogens. Fluorine Liquid Chlorine Solid

11 Bromine Gas Iodine Gas Extension: The Kalgoorie Super Pit in Australia is the world s biggest open cast gold mine. It is 3 km long, 1.5 km wide and 0.4 km deep. Estimate the volume of earth removed (assume the pit is rectangular in shape and has vertical sides). Use your answer to question above to estimate the mass of earth removed if 1 km 3 earth has a mass of 2.7 billion tonnes. Remember to show all your working out!

12 Understanding oxidation 1. Match the name of each oxide with its formula. calcium oxide CaO 2 carbon dioxide CO water SO 2 sulfur dioxide H Which of two statements are true and which are false for this reaction? calcium + oxygen calcium oxide It is a reversible reaction True It is an irreversible reaction False It is an oxidation reaction True It is a physical change False 3. The diagram shows an experiment to see what happens when air passes over heated calcium metal. The calcium reacts with oxygen during the experiment. This diagram shows the experiment at the start.. a. How much air is there in the gas syringes at the start of the experiment? b. Look at the diagram below, how would the volume of the air in the syringes change as the calcium is heated? c. What would be the name of the compound formed in the reaction?

13 d. Write a word equation for the reaction. Extension: Above is a picture of an old pulley wheels used in the gold rush in the 1880 s in San Franscisco, describe what material it is made. Describe the changes that have happened to it over time. Explain why Write an equation for the reaction

Science Class 8 Topic: Elements And Compounds Reinforcement Worksheet

Science Class 8 Topic: Elements And Compounds Reinforcement Worksheet Name: Sec: Date: Q1.Choose the best answer. 1. Which of the following is an element? a) steam b) sugar c)dry ice d) sulphur 2. Which