Solutions & Dissolving
A student puts a spoonful of sugar into cold water and another spoonful into hot water. Which sugar will most likely dissolve faster?
What is the sugar in the hot water?
A solution contains a small amount of salt mixed into a large amount of water. Is it concentrated or diluted?
What is diluted?
Ice melts into liquid water.
What is Physical Change?
What is an element?
What is a pure substance made of only one type of atom?
In H₂O, how many hydrogen atoms are represented?
What is 2 atoms?
What happens to the rate of dissolving when the solute is stirred?
What is it usually dissolves faster?
What does it mean if a solution is saturated?
What is the solution that contains the maximum amount of solute that can dissolve under those conditions?
Two substances are mixed and a new solid forms. What type of change is most likely occurring?
What is Chemical Change?
Is O₂ an element or a compound?
What is an element?
In CO₂, how many oxygen atoms are represented?
What is 2 atoms?
A student crushes a solid into smaller pieces before mixing it into water. Why might this help it dissolve faster?
What is it increases the surface area of the solute?
A student has a very salty solution and wants it to become less concentrated. What should they add?
What is water?
A piece of paper is cut into several smaller pieces.
What is a Physical Change?
Is H₂O an element or a compound?
What is a compound?
How many total atoms are in H₂O?
What is 3 atoms?
A student wants to make a powdered drink dissolve faster. Name two things the student could do.
What is increase the temperature, stir/agitate the mixture, or increase the surface area of the powder.
Which solution is more concentrated: 2 grams of drink mix in 100 mL of water or 10 grams of drink mix in 100 mL of water?
What is 10 grams in 100 mL of water?
A substance produces gas bubbles and releases heat when mixed with another substance. What are these observations evidence of?
What is a Chemical Change?
How can you tell that CO₂ is a compound?
What is it contains more than one type of element: carbon and oxygen?
How many total atoms are in CaCl₂?
What is 3 atoms?
Three students dissolve the same amount of sugar in water. Student A uses 10°C water, Student B uses 40°C water, and Student C uses 80°C water. Which student should have the shortest dissolving time?
What is Student C?
A student keeps adding sugar to a glass of water. Eventually, some sugar remains at the bottom even after stirring. What does this tell you about the solution?
What is the solution has become saturated?
What is the main difference between a physical change and a chemical change?
What is a physical change does not create a new substance, while a chemical change produces one or more new substances.
Classify each of the following as an element or compound: Fe, H₂O, O₂, NaCl.
What is
Fe = element
H₂O = compound
O₂ = element
NaCl = compound
How many total atoms are in Al₂(SO₄)₃?
What is 17 atoms?