Water Cycle
What is dew/frost?
Dew is condensation of water vapor that's in the air. Frost is frozen dew.
Give an example of a qualitative property of matter.
Answer will vary. Something with the 5 senses.
What is a physical change?
A change that occurs in matter where the substance is still the same substance.
What is a chemical change?
A change in matter where a new substance is formed.
What is the law of conservation?
Matter cannot be created or destroyed. The sum of all parts equals the total mass.
At what stage of the water cycle is heat added to make a change occur?
Evaporation and transpiration
Give an example of a quantitative property of matter.
Answers will vary. Something measurable.
What are some ways you can tell a physical change has occurred? (ex. boiling)
freezing, melting, cutting, tearing...
bubbles, change in temperature, change in color...
If you make ice cream using 10g of vanilla, 50g sugar, and 150g milk, how much ice cream did you make?
210 grams
What is the opposite of evaporation?
Condensation
They expand, get longer
Is sugar dissolving in water a chemical or physical change?
Physical
Is metal melting an example of a new substance being formed?
No, metal melting is a physical change.
If you are cutting a tree to make mulch and you end up with 20 pounds of mulch, how much did the original tree weigh?
20 pounds
Rain - falling water droplets
Snow - frozen water where vapor sticks to each
hail - gusty winds cause water droplets to go up and freeze.
Sleet - rain that freezes , goes through a warm patch, and then back into a cold.
3g of Lemon juice and 2g of baking soda are mixed in a bowl to cause bubbles. Use properties of matter to describe this change.
answer will vary.
The lemon juice is yellow, baking soda is white, bubble emit a gas, the total mass is 5g...
Is baking a cake an example of a physical change?
No. The substance changed. It was batter, now it's cake.
Is a bike rusting an example of a chemical change?
Yes, rust is a new substance and it cannot change back.
How does cutting a whole apple pie into 6 pieces affect its mass?
Cutting the pie does not change the mass of the pie.
Where can we see condensation other than in the water cycle? Why? (where is the heat, where is the cold)
Answer will vary.
What is being described?
Twelve rectangles, melty, brown, smooth, creamy, 16 grams...
A chocolate bar
True or False: evaporation is a chemical change
False: evaporation is a physical change. No new substance was formed.
If I cut an apple and leave it out it begins to turn brown. Is the apple turning brown chemical or physical?
It is chemical.
If I let an apple decay in a jar, will the mass change as it decomposes?
No, the mass will stay the same.