Elements & Componds
Counting Atoms
Physical & Chemical Changes
Solutions
Dissolution
100
Look at the picture. What is this elements chemical symbol?
The chemical symbol is Cu. (Capital C lowercase u)
100
The chemical formula for Carbon dioxide is CO2. How many atoms of oxygen is in carbon dioxide?
2
100
What is the difference between a physical and chemical change?
A physical change will not change the substance, but a chemical change will create a new substance.
100
What is a solution?
A solution has substances that are easily mixed, so you cannot identify each individual substance. It can also be referred as a homogeneous mixture)
100
What does dissolution mean?
The process where a solute dissolves in a solvent to form a solution.
200
What is the difference between an element and a compound?
An element has one atom which is the same throughout and a compound has 2 or more elements with different atoms throughout.
200
Look at the chemical formula for baking soda NaHCO₃. How many atoms are in sodium, hydrogen, carobon, & oxygen?
Na (Sodium)-1
H (Hydrogen)-1
C (Carbon)-1
O (Oxygen)-3
200
A fire burning wood would be an example of a ___________ change.
Chemical
200
What is a aqueous solution?
When the solvent is water.
200
We can increase the rate of dissolution, how can we do this? (List all the ways we can increase the rate of dissolution)
-Agitation
-Surface area
-Temperatura
300
Fill in the blanks: Elements will have the ________ atoms throughout, and compounds will have __________ atoms throughout.
Same & different
300
How many Carbon and Oxygen atoms are present in 2C2O2 ? How many molecules are represented?
C (Carbon)-4
O (Oxygen)-4
Total atoms-8
300
Salt dissolving into water would be an example of ___________ change.
Physical
300
What is a solute?
Solutes are what is being dissolved. Solutes determine the strength or weakness of aqueous solutions.
300
If we stir lemonade mix into water, we are using the method of ___________ to increase the rate of dissolution.
Agitation
400
Is H2O an element or a compound? Explain your answer.
H2O is a compound, because it's made of two or more elements/atoms.
400
Look at the chemical formula Al2CO2. How many atoms are in each element and how many total atoms are in the chemical formula?
Al (Aluminum)-2
C (Carbon)-1
O (Oxygen)-2
Total atoms-5
400
What is a precipitate?
A solid that forms from two liquids being mixed together.
400
What is a solvent?
A solvent is a substance that dissolves a solute, resulting in a solution
400
A Alka-Seltzer tablet is broken into 4 pieces and dropped into water, will the rate of dissolution increase or decrease? Explain your answer.
Increase, because you have increased the surface area of the Alka-Seltzer tablet.
500
Is O2 an element or a compound? Explain your answer.
O2 is an element, because it's the same atoms throughout the molecule.
500
Identify the number of atoms for each element and the total number of atoms in this chemical formula Mg(OH)2.
Mg (Magnesium)-1
O (Oxygen)-2
H (Hydrogen)-2
Total atoms: 5
500
What evidence is produced when a chemical change takes place? (Must get all 4)
-Production of a gas
-Change in temperature or thermal energy
-Color Change
-Formation of a precipitate
(Bonus-production of light)
500
Identify the solute, solvent, and solution in the picture below. Solid is salt.
Solute-Salt
Solvent-Water
Solution-Salt water
500
Look at the image below. Which two solutions have the same amount of concentration?
Solution B and Solution E will have the same amount of concentration, because solution E has half the water and half the solute is in the beaker compared to solution B that has double of both. This would equal the same amount of concentration.