GRADE 6 REVIEWER

Joyce wanted to cook rice but do not know what separating techniques must be used to separate the rice and the water itself. What will you recommend to her?

• Filtration

• Using a magnet

• Decantation

• Seiving

Filtration: Filter

Sieving: _________

• Magnet

• Strainer

• Filter paper

• Hands

Gucci will separate 5 peso coins and iron nails. What method will you recommend to her?

• Using a magnet

• Sieving

• Filtration

• Hand picking

Answer explanation

Magnet will attract both coins and iron nails so it will be easier to use Hand picking. Just make sure to wear gloves.

When it comes to coffee making, (a)   is the separating technique that is used.

Answer explanation

In coffee making, we use "filter paper" so that the coffee grains will not be in our drink itself.

The higher the temperature of a solution, the (a)   the solute will be dissolved.

Answer explanation

The higher the temperature, the faster the molecules of the solvent moves thus result to faster solubility of solute.

STATEMENT 1: Blood is pure substance.

STATEMENT 2: Water is a homogenous mixture.

• Both statements are TRUE.

• Both statements are FALSE.

• 1st statement is TRUE, 2nd is FALSE

• 1st statement is FALSE, 2nd is TRUE.

Answer explanation

Blood is a colloid. Platelets, red blood cells, white blood cells and plasma are trapped in it.

Water is a pure substance since it is a compound.

We can determine the type of solution by using the _______ ______. This is also known as the scattering of light in a mixture.

(a)  

Answer explanation

The Tyndall effect is an easy way of determining whether a mixture is colloidal or not. When light is shined through a true solution, the light passes cleanly through the solution, however when light is passed through a colloidal solution, the substance in the dispersed phases scatters the light in all directions, making it readily seen.

Which of the following is NOT considered as a mixture?

• 
• 
• 
• 

Answer explanation

Gold is an example of a pure substance. Gold is a chemical element with the symbol Au and atomic number 79.

Carl is enrolled to a school for boys. Technically all the students here a male. What kind of mixture of students does Carl's new school have?

• Heterogeneous

• Homogeneous

• Suspensions

• Colloid

Answer explanation

The mixture of students is considered HOMOGENEOUS since all of them are boys. Homo= same geneous= kind

The air that we breath is an example of ___________ _______.

(a)  

Answer explanation

Air is a homogeneous mixture of the gaseous substances nitrogen, oxygen, and smaller amounts of other substances.