WorksheetsMatter 7th Grade
Total questions: 18
Worksheet time: 48mins
We prepare a 70 g solution of ethanol in 100 ml of water. Look for the density of ethanol in your book in order to calculte the concentration of this solution in g/L. Round off your answer to the units.
370.53 g/L
371 g/L
371 g/m3
None of the above.
Calculate the concentration of a solution consisting in 10 g of salt in 250 mL of water.
40 g/L
39
41 g/L
None of the above.
We have 6 m3 of water on a pool. How many 21L jars would we need to fill it.
285.71 jars
285.72 jars
285 jars
286.71 jars
Look at the photo and select what type of mixture is in each container.
Solution & Colloid
Homegenuos & Sea water
Suspension & precipitate
None of the above.
What is this effect called?
Tyndall effect
Light dispersion
Lazer test
None of the above.
Match each description to its fluid:Homogeneous in appearance, it can be separated into several substances by applying heat.
Compound.
Solution.
Simple substance.
Heterogeneous mixture.
Match each description to its fluid:A pure substance formed by the same type of atoms.
Compound.
Solution.
Simple substance.
Heterogeneous mixture.
Match each description to its fluid: A union of several substances of a non-homogeneous appearance.
Compound.
Solution.
Simple substance.
Heterogeneous mixture.
Match each description to its fluid: A pure substance composed of different kinds of atoms.
Compound.
Solution.
Simple substance.
Heterogeneous mixture.
If dwood= 160 kg/m3. Calculate the mass of a table that is about 60 dm3
9.6 kg
9.60 kg
7 kg
None of the above.
The following image corresponds to the process of...
Dissolution of salt in water
Dissolution of sucrose in water
None of the above
Colloids process
The following image corresponds to the process of...
Dissolution of salt in water
Dissolution of sucrose in water
None of the above
Colloids process
The following formulas correspond to: C₁₂H₂₂O₁₁ & NaCl
Water and salt
Sucrose and salt
Carbon and sugar
None of the above.
Calculate the concentration, in g/L, of an aqueous solution consisting of 5 g of glucose and 75 g of water. In this case, the density of the solution is equal to that of the water, 1.00 g/mL
66.67 g/L
66.67
67
None of the above.
A solution is saturated if we cannot add more solute
True
False
Explain which physical process is represented in the following picture
Evaporation
Disolution
Condesation
Destilation
Cristalisation is a method use for separating...
Homogeneous mixtures
Heterogeneous mixtures
Suspensions
Colloids
We prepare 140 g solution of seawater in 150 ml of water. Calculate the concentration of this solution in g/L
488.96 g/L
488.96
489
None of the above.
