Types of Mixture
Brass is an example of a __________ mixture
Homogeneous
Which method is used to separate an insoluble solid from a liquid?
Filtration
I look the same throughout and my components cannot be seen separately. What am I?
Homogeneous mixture
Which of the following are homogeneous mixtures?
□ Air
□ Brass
□ Salt solution
□ Muddy water
Air brass salt solution
Unit used to define the term concentration_______
Percentage
A homogeneous mixture may contain more than one substance. True or false
TRUE
Which method would you choose if the solvent is more valuable than the solute?
Distillation
I leave the solution when the solvent disappears into the air. What process am I?
Evaporation
Which statements about mixtures are correct?
□ Components retain their properties.
□ Components are chemically combined.
□ Composition may vary.
□ They can often be separated physically.
Components retain their properties, Composition may vary, They can often be separated physically
Correct formula
Is every solution a homogeneous mixture?
Yes
Mention the state of change in sublimation and deposition
Sublimation : Solid to gas
Deposition : Gas to solid
I am the maximum amount of solute that can dissolve in a given solvent at a particular temperature. what solution am i?
Unsaturated solution
Which of the following can act as solvents?
□ Water
□ Alcohol
□ Air
□ Acetone
Water, Alcohol, Acetone
5 g of salt is dissolved in 95 g of water. What is the concentration of the solution in mass percentage?
Write correct answer on board
5%m/m
Milk is a true homogeneous mixture because it looks uniform. True or false
Yes if particles are invisible to naked eye it will appear homogeneous, Example : Blood or milk
Why is a filter paper ineffective for separating sugar from sugar solution?
Sugur particles are dissolved so it will pass through the filter paper
I can separate ink into several colours, exposing secrets hidden in a single black line. What method am I?
Paper chromatography
Which changes will decrease the concentration of a solution?
□ Adding more solvent
□ Removing some solute
□ Adding more solute
□ Increasing the volume of solvent
Adding more solvent, Removing some solute, Increasing the volume of solvent
A perfume contains 25% fragrance by volume. If the total volume of perfume is 400 mL, what is the volume of fragrance?
100mL of perfume
The components of homogenous mixture is visible to naked eye
True or false
True
A scientist wants to know whether a green pigment is pure or a mixture. Which method should be used?
Chromatography
"I am invisible but measurable,
changeable but calculable,
stronger when increased,
weaker when diluted.
Without me, solutions cannot be compared.
What am I?"
Concentration
Which statements are true for saturated solutions?
□ They contain the maximum amount of dissolved solute at a given temperature.
□ More solute can dissolve easily.
□ Undissolved solute may be present
□ They contain the maximum amount of dissolved solute at a given temperature.
□ Undissolved solute may be present
A solution contains 40 g sugar and 160 g water. Half of the water evaporates. What is the new concentration?
33% m/m, or 100/3 %/m