WorksheetsL7_Chemistry
Total questions: 30
Worksheet time: 36mins
This number tells the number of atoms present.
The number of atoms present in one molecule of an element is called
Valency
Atomicity
Coefficient
Formula
How do you know that rusting is a chemical change?
it changes color
atoms were rearranged to form a new substance
we just know
the rust
Hydrochloric acid reacts with potassium hydroxide to produce a salt, water, and heat. This is a ...
Chemical Change
Physical Change
None of the above
Sugar dissolves in water. What is the change seen?
Chemical Change
Physical Change
None of the above
Identify the change shown in the picture.
Irreversible physical change
Irreversible chemical change
reversible physical change
reversible chemical change
What is the Reddish - Brown Substance we can see on Iron
Copper Sulphate
Iron
Rust
Baking Soda
Which of the following is the chemical word equation for the reaction between Vinegar and Baking soda?
Vinegar+Baking Soda+Calcium Carbonate------> Water
Vinegar+Baking Soda------> Water + Carbondioxide + Sodium acetate
Vinegar+Baking Soda--------------> Calcuim Carbonate
when something burns, it reacts with the .... in the air
CO2
CO
C
O2
In a chemical change, new substances are formed, for example
heating glass and bending it
melting an ice
burning of wood
boil water
sodium carbonate + hydrochloric acid → sodium chloride + water + carbon dioxide
Which product contains the element hydrogen?
hydrochoric acid
water
carbon dioxide
Choose the odd one out -
China Rose (Hibiscus)
Salt
Methyl Orange
None of the Above
Indicators are -
Substances which are nor Acidic or Basic
Substances that are used to test the Acidic or Basic nature of a substance
Substances which have both chemical and physical properties
None of the Above
Which of the following statements are true about Acids ?
They are sour in taste and soapy to touch
They are sour in taste
Acids are present in Oranges, Ant sting, Vinegar etc.
Acids are present in Vinegar, Sugar, Soap etc.
When the pH Scale is on 5, the Nature of the substance is -
Neutral
Acidic
Basic
None of the Above
Acid in car battery:
Hydrochloric acid
Sulfuric acid
Acetic acid
Carbonic acid
Four solutions are tested and found to have the following pH values. Which of these substances would be considered the weakest acid?
Lemon Juice - pH=2
Apple Juice - pH=4.5
Shower Cleaner - pH=5.5
Hydrogen Peroxide - pH=7
An indicator that turn green in basic medium is _______.
Phenolphthalein
China rose
Litmus paper
Turmeric power
Identify basic salt.
Sodium chloride
Ammonium chloride
Sodium acetate
Copper acetate
An aqueous solution of NaCl can turn red litmus into-
Blue
Color remains same that is red
Changed to purple
None
NaOH and KOH are also known as-
Strong bases
Alkalis
Both
None
