Science

Created by

Hazel

Cards (22)

What is the atmosphere?
The layer of air on Earth essential to living things
What are the main components of air?
Nitrogen (78%), oxygen (21%), carbon dioxide（0.03%), noble gases (0.9%), water vapour (0.07%)
What happens when a burning splint is put in oxygen?
It burns more brightly, supporting burning
What happens when a glowing splint is put in oxygen?
It relights
What is the effect of adding hydrogen carbonate indicator to oxygen?
It remains red
What happens when carbon dioxide is tested with a burning splint?
The splint goes out
What happens when a glowing splint is put in carbon dioxide?
The splint goes out
What is the effect of adding hydrogen carbonate indicator to carbon dioxide?
It turns from red to yellow
What happens when limewater is tested with carbon dioxide?
It turns from colourless to milky
What is the test for water?
It turns dry cobalt chloride paper from blue to pink
What are the raw materials for photosynthesis?
Carbon dioxide from the air and water from the soil
What is the energy source for photosynthesis?
Light energy absorbed by chlorophyll
What is produced as a byproduct of photosynthesis?
Oxygen
What is the word equation for photosynthesis?
Carbon dioxide + water → glucose + oxygen
What is the chemical equation for photosynthesis?
$6CO_2 +$ $6H_2O \xrightarrow{\text{light energy}} C_6H_{12}O_6 +$ $6O_2$
What is the purpose of using iodine solution in photosynthesis experiments?
To test for starch, which changes from brown to blue-black
How can you destarch a plant? 
By placing it in the dark
What does the variegated leaf test show about starch production?
Starch is produced in the green parts of the leaf
What are the necessary factors for photosynthesis?
Chlorophyll, carbon dioxide, and light
What is the significance of photosynthesis? 
Provides food for living things
Maintains the balance of oxygen and carbon dioxide in nature
What are the roles of producers and consumers in food chains?
Producers: Make their own food
Consumers: Feed on plants or animals
Arrows in food chains show the direction of energy flow
What is the ultimate source of energy in food chains?
The sun