Science Test / Grade 8
1. Consider one ecosystem around the world and come up with two examples of natural
changes that occur in that ecosystem.
2. Define the following concepts. Do they keep the environment healthy? If not, how would
their impacts be reduced?
-
Combustion engine
-
Petrochemicals
-
Photosynthesis
-
Respiration
3. Interpret the graphic on the next page by precising the topic, what you see and what it
means to you.
4. Fill in the carbon cycle diagram on the next page with the following words: combustion,
respiration, respiration in decomposers, fossilization, feeding, death and photosynthesis.
Science quiz no 1. Grade 7B
1. What is the difference between a strong acid and a weak acid? Give an example for each.
2. Fill in the following word equation
…………………… + ……………………….
Acid + Alkali
How do you read it?
Why is that reaction called neutralization equation?
3. State the nature of the following substance and whether the pH will increase or decrease
after dilution.
Substance
Initial pH
Vinegar
2
Bleach
13
Pure water
7
Nature (acidic or
basic)
pH variation after dilution
(increase or decrease)
Science quiz no 1. Grade 7A
1. What is the difference between a strong acid and a weak acid? Give an example for each.
2. Fill in the following word equation
…………………… + ……………………….
Acid + Metal
How do you read it?
What is the use of a chemical indicator?
3. State the nature of the following substance and whether the pH will increase or decrease
after dilution.
Substance
Initial pH
Soapy water
12
Soda
3
Pure water
7
Nature (acidic or
basic)
pH variation after dilution
(increase or decrease)