Matter

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