Changes of State
What is the process of a liquid turning into a gas?
Evaporation
Name one property of a solid
Fixed shape or particles closely packed
What is the process of water turning into vapor called?
Evaporation
What is the smallest unit of matter?
Atom
What is a compound?
A substance made of two or more elements chemically bonded
What is the name of the process when gas changes into a liquid?
Condensation
What state of matter flows and takes the shape of its container?
Liquid
What do we call water falling to the ground as rain, snow, or hail?
Precipitation
What is the chemical symbol for Sodium?
Na
What do the formulae CO₂ and CO represent?
carbon dioxide and carbon monoxide
At what temperature does water freeze?
0°C
Which state of matter has the most energy: solid, liquid, or gas?
Gas
Explain the role of the sun in the water cycle
It provides energy for evaporation
What is the first element in the periodic table?
Hidrogen
Name a compound made from Sodium (Na) and Chlorine (Cl).
Sodium chloride, or table salt
If 50g of ice melts completely, how much water is produced?
50g of water, as the mass remains the same during a state change
What happens to gas particles when you compress the gas?
They get closer together
A lake loses 2,000 liters of water daily through evaporation. How much water is lost in 7 days
2,000L×7=14,000L
What are the names of the vertical columns and horizontal rows in the periodic table?
Write the formula of calcium carbonate and magnesium oxide
CaCO3 and MgO
A 200mL container of water is heated and loses 50mL as water vapor. How much liquid water remains?
150 ml
Draw or describe the particle arrangement in solids, liquids, and gases
Solids—closely packed, Liquids—loosely packed, Gases—spread apart
What is the term for water moving through the ground into rivers, lakes, or oceans?
Runoff
Calculate the result of the following: the number of sulfur atoms in a sulfur molecule , divided by the number of oxygen atoms in an oxygen molecule , minus the number of helium atoms in a helium molecule.
3
how many total atoms are in 2 molecules of water?
2H+1O=3; 3×2=6