Chemistry

Subdecks (6)

Cards (88)

what is the purpose of an indicator in a chemical experiment
to show different colors in acids and bases
2. What is used in ' making the red cabbage indicator ' to grind the cabbage
Pestle and mortar
3. What is the color of the red cabbage indicator when in contact with sodium hydroxide
purple
4. why was the crushed cabbage heated with water in the experiment
To extract the colors
5. What effect would curning red cabbage indicator yellow have on universal indicator
Turn it red
6. What is neutralization
A. reaction between acids and alkalis
7. what is the word equation for neutralisation
Base + acid = water + salt
8. in a neutralization reaction what results from the reaction between acids and alkalis
Salt and water
9. What % of oxygen is in the air
20-21%
10. What is the general word equation for the determination of oxygen using copper metal
Copper + oxygen = copper oxide
11. how is oxygen removed from the air in the experiment to determine its percentage
by passing over copper metal
12. what is the main residual gas after oxygen removes in the experiment
nitrogen
13. what change in appearance does copper undergo during the experiment to
Brown to Black
14. what type of change its decomposition of hydrogen peroxide
chemical
15. what gas is produced by the decomposition of hydrogen peroxide
oxygen
16. what is the purpose of the black solid compound in the decomposition of hydrogen peroxide
to speed up the reaction
17. what color is oxygen
colorless
18. what is the symbol for oxygen
O
19. which gas is the. major part of air
nitrogen
20. Is decomposition a physical or chemical change
chemical
21. what common name do we give to the oxide of hydrogen
water
22. what do we use to measure the pH of solutions
universal indicator
23. what is the color of oxygen
colorless
24. what is the test for oxygen
re-lights a glowing splint
25. what is the test for co2
limewater turns cloudy

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