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Total questions: 12
Worksheet time: 6mins
This is an experimental set-up for vinegar and baking soda, the product produced are water and sodium acetate. What change has taken place?
chemical change
physical change
In this experimental set-up, a balloon is placed at the mouth of the flask, the reaction had caused thr baloon to be inflated.
There is production of light
There is sound produced
Heat is produced
Gas evolved from the reaction.
What is a needed rod that will connect point P and point Q for the bulb will light up?
conductor
insulator
both conductor and insulator
Which rod will conduct electricity to the bulb?
Copper rod
Glass rod
Wood rod
Plastic rod
Check the chemical reaction and the labels. The 80 g for methane and oxygen will produce 80g of carbo dioxide and water. This shows the_____
Conservation of energy
Conservation of mass
Conservation of compounds
every option is correct
You were asked to prepare 200 g of mercuric oxide in the laboratory. How much mercury
will you need of you have 34 g of O available?
234g
5.88 g
166g
6800 g
How will you get the percentage of hydrogen in the water?
100%- 89% =
100%- 11% =
89% +11% =
100%+ 89%=
In Rutherford’s gold foil experiment, some of the alpha particles passed completely undeflected through the gold foil. What did Rutherford conclude from this observation?
Electrons have positive charge.
Alpha particles have a positive charge.
The atom is made up of mostly empty space.
There must be a small, positively charged, dense area within an atom.
Which one is a pure element?
yellow and black
blue and blue
blue and black
blue and yellow
Calcium has one electron in its outermost shell. It is
anion
Cation
Bromine has seven electron in its outermost shell. It is a/an
anion
Cation
Iodine has seven electron in its outermost shell. It is a/an
anion
Cation
