HW20

Two cups of water are at the same temperature; 2g of Rock Salt is placed in one; 2g of regular salt is places in another. Which will dissolve faster?

• The rock salt

• The regular salt

• Neither will dissolve at all

• They will dissolve at the same rate.

Two cups of water have 2g of regular salt added; one cup is 100 degree; the other is 70 degrees. Which will dissolve faster?

• Neither; they will dissolve at the same rate.

• the 70 degree water

• the 100 degree water

• Salt cannot dissolve in water

Two cups of water are at the same temperature; 10g of salt is added to one cup; 2g is added to another. Which will dissolve first?

• The cup with 2g

• The cup with 10g

• Neither, they will dissolve at the same rate.

How can the cups and salt investigation be sped up?

• by stirring

• it cannot; salt cannot dissolve in water

• by using rock salt

• by using sugar instead

What is happening in this picture?

• The candy is getting hot and melting.

• The candy is turning in to salt.

• The candy is heating the water.

• The candy is dissolving in the liquid

Three cups are filled with 1Liter of water of the same temperature; 2g of salt is added to one; 1g of salt of salt is added to the other; What is the varibale in this investigation?

• The temp of the water

• The amout of salt

• The size of the cups

• The amount of water

Which of these planets has the LARGEST gravitational pull?

• Pluto

• Neptune

• Jupiter

• Earth

Which dumbells would take the MOST FORCE to move?

• 7kg

• 2kg

• 5kg

• 9kg

USE SCRATCH PAPER AS NEEDED!

A model car travels 20 meters in 10 seconds. How may meters will it travel in 30 seconds if it keeps the same speed?

• .4 meters

• 45 meters

• 30 meters

• 60 meters

Thrust is...

• a measuremet of time

• a pull

• a force, ususally a push

• the same as drag