Your pulse measures how many times your heart beats in one minute. Your pulse goes up when you exercise. • • •
Record your pulse when you are resting, and fill in the table. Now jog on the spot or do star jumps for two minutes. Measure your pulse again and fill in the table.
Resing Pulse (beats per minute)
Pulse After Exercise (beats per minute)
What is the effect of exercise on your pulse rate? Use your table to help you decide. ____________________________________________________________________________________ ____________________________________________________________________________________
Plants are different from one another because each one is adapted to the environment it grows in. Join up the boxes with the name of the plants, where they grow and how they are adapted to living in those conditions. The pictures will give you a clue. Seaweed live in shady areas Foxglove
lives in salty water and on rocky seashores
water is stored in the fleshy parts of the plant, and leaves are covered with wax so they don’t lose too much water. has large leaves that float on the surface of the water to collect the sunlight, and long leaf stems that go down into the water
Marram Grass lives in fresh water
has very long roots that can reach down to the water
Indicators and pH Litmus paper tells us whether something is an acid or an alkali. But it does not tell us the strength of an acid or alkali. A universal indicator can tell us whether we have strong acid or a strong alkali by producing a pH scale. Red means a strong acid, blue means a strong alkali. Green means a neutral solution.
We can’t use litmus paper to find out the strength of vinegar compared to stomach acid or lemon juice. As the paper would turn red, regardless of strength. Instead, you need a universal indicator. Universal indicator is a mixture of dyes, it changes colour to show how acidic or alkaline the solution is. The pH scale is a measure of the strength of an acidic or alkaline solution. • An acid will always have a pH lower than 7, the closer to 1 the pH is the stronger the acid is. • An alkali has a pH of more than 7, the higher the pH the more alkaline the solution is. • Some solutions are neutral, this means neither acidic or alkaline - this pH of a neutral solution is exactly 7.
Draw lines from the following substances to the correct category:
Lemon
Soap Vinegar
Water Lily lives in desert areas
likes damp conditions but has long flowers that reach up to the sunlight
Cactus lives in sandy areas
YOU R SUMMER BO O KL ET
TASK ONE: Acids and alkalis
How acidic? How alkaline?
TASK FOUR: Adaptations
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WEEK 4: CHEMISTRY
Delta Academies Trust
has gas filled bubbles to help it float on the surface of the water
Coca cola
Toothpaste
ACID ALKALI
Litmus paper is an indicator paper, what colour would:
Red litmus paper turn in acidic solution: _______________________________________
Red litmus paper turn in an alkaline solution:___________________________________
Blue litmus paper turn in an acidic solution:____________________________________
Red litmus paper turn in an alkaline solution:___________________________________
YOUR SUM M ER B OOKL ET
Delta Academies Trust
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