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WorksheetsThe Nose Knows and Other Curious Chemistry
Total questions: 25
Worksheet time: 22mins
Which hypothesis is this testing if Snails are place in blue Bromothymol Blue?
Snails use up CO2 and will turn solution yellow
Snails produce CO2 and will turn solution yellow
Snails produce CO2 and solution should stay blue
Snails only produce CO2 when place in the dark.
To test if Plants respire and produce CO2 in the absence of light, Elodea will be place in ________ Bromothymol Blue solution and placed in the _____________.
blue; light
blue; dark
yellow; light
yellow; dark
Which of these is an alkali?
Nitric acid
Sodium hydroxide
Water
Milk
When detecting the odour of a chemical you should...
put your nose over the chemical and take a deep breath
use your hand to fan the odour towards your nose.
Esters are known for......
the bright colours
flammability
exploding
fruity smell
Esters are formed by the special synthesis reaction called _____.
Decomposition
Dehydration
Neutralization
Combustion
The ester methyl salicylate (also known as oil of wintergreen) uses ____ alcohol and ____ acid as the reactants.
methanol, carboxylic acid
ethanol, salicylic acid
methanol, salicylic acid
ethanol, carboxylic acid
Carbon based molecules can be structured as
Straight chain
Branched chain
Ring
All of the above
What happens if a catalyst is added to a chemical reaction?
The rate of reaction changes
The amount of product increases
The amount of product decreases
The catalyst will have no affect on the reaction
A substance able to increase the rate of a chemical reaction without itself being consumed or changed by the reacting chemicals is called a catalyst
False
True
H2O2 is the chemical name for _________________________________.
hydrogen peroxide
alcohol
water
iron
Based on what you observed in the Baby Elephant Toothpaste Lab, the signs of a chemical reaction are:
Bubbles/Fizz
Temperature Change
New odor formed
All of the above
The scientific name of yeast is
Rhizopus stolonifer
Abelmoschus esculentus
Saccharomyces cerevisiae
Allium cepa
What does yeast contain that speeds up chemical reaction?
dipoles
Catalyst enzyme
Hydrogen bond
2 vowels
What is the purpose of the dish soap in the Baby Elephant Toothpaste lab?
There is no apparent reason
To help contain the hydrogen peroxide
To enhance the production of oxygen
To trap oxygen and produce bubbles
What does hydrogen peroxide break down into?
Water & carbon dioxide
Hydrogen & peroxide
Water & oxygen
Yeast
