What are the three main elements that make up all living things?
What are Hydrogen, Oxygen, and Carbon
100
To calculate Density you must know these two things.
What is mass and volume
100
Which is most likely to contribute to groundwater pollution?
*pulling weeds
*spraying pesticides
*planting non-native species
*watering plants with an irrigation system
What is spraying pesticides
100
Solid, liquid, and gas.
What is the 3 states of matter.
100
What percentage of the Earth is covered by water?
What is 75%
200
2 Hydrogen atoms and 1 Oxygen atom
What two elements makes up water?
200
Which unit best identifies mass? *g/cm3, *g, *cm3, *ml
What is g
200
Which of the following substances is an element
*sulfur
*water
*carbon dioxide
*ammonia
What is sulfur
200
What happens to the speed of particles of ice as it melts?
What is they move more rapidly.
200
What is the most likely pollution risk of applying salt to roads to melt ice and snow?
What is groundwater pollution
300
These are made of two or more different elements.
What is a Molecule or Compound?
300
Volume = 100 ml - Mass = 45 g. What is the Density?
What is 0.45 g/ml
300
NaCl - Table Salt has how many different elements in it?
What is 2
300
What best describes what happens to the speed of particles in liquid water at the temperature increases from 40 C to 50 C?
What is they speed up
300
If all the water on Earth equaled 1000 ml, what amount would be available for human use at any moment in time?
What is about one drop
400
Hydrochloric Acid (HCl) is made of how many different elements?
What is 2
400
The formula to calculate density is
What is mass/volume
400
What is the difference between an element and a compound?
What is a compound is made of two or more elements and an element is a pure substance made of only one type of atom.
400
The process of water vapor changing back into a liquid is called
What is condensation.
400
Why can't ocean water be used for human consumption?
What is it will cause our cells to dehydrate.
500
These can not be broken down into any other substance.
What is an element?
500
What does weight actually measure?
What is the amount of gravitational force acting on an object
500
The boiling point of pure water at sea level on the celsius scale is
What is 100 C
500
When a solid changes directly into a gas without first changing into a liquid is called what?
What is sublimation
500
What happens to the volume of water as it freezes?