Experience 1
Chemists organize the elements into a system called the _______ _______.
It shows each element's chemical _________.
Chemists use Chemical _______ to represent a molecule of a compound.
Periodic Table
Symbol
Formula
True or False
Melting an ice cube is a chemical change.
False
It is a physical change.
The substance dissolved in the water is called the (solute / solvent).
Solute
True or False
Si is a compound.
False
Si is the element Silicon
True or False
As the temperature increases, the solute will dissolve fsster into the solution.
True
Which of the following statements correctly compares elements and compounds?
A. Molecules that contain only one kind of atom are pure elements, while molecules that contain more than one kind of atom are compounds.
A. Molecules that contain only one kind of atom are pure elements, while molecules that contain more than one kind of atom are compounds.
Bubbles form when sugar and water are added to yeast to help make bread rise. Which best describes that type of change?
Chemical or Physical?
Chemical Change
True or False
The solute is poured into the solvent and that creates a solution.
True
Which molecules are elements?
Which molecules are compounds?
O3 H2O CH4 CH2O Cl2
O3 and Cl2 are elements.
The rest are compounds.
Which of the following actions increases the concentration of an aqueous solution?
a. decreasing the amount of the solute
b. increasing the amount of the solvent
c. increasing the amount of the solute
c. increasing the amount of the solute
Use the periodic table to identify the elements and number of atoms in the compound: F3B4
Breaking a cookie into smaller pieces is a physical change because:
a) The chemical makeup of the cookie changes.
b) A new substance with different properties is formed.
c) Only the size and shape of the cookie change.
c) Only the size and shape of the cookie change.
If you evaporate the solvent from an aqueous solution, then you (increase / decrease) the concentration of the solution.
Increase
O2 --- O3 --- O4
These compounds contain the same {_______} because each formula has the same {_____ _______} . They are different compounds because they have different {_____ ______} .
Elements
Chemical Symbol
Chemical Formula
Student 1 dissolved a whole sugar cube in 20°C water.
Student 2 dissolved crushed sugar in 20°C water.
Student 3 dissolved crushed sugar in 30°C water.
Student 4 dissolved a whole sugar cube in 10°C water and stirred the mixture.
Based on each student’s experimental setup, which student completed the task fastest?
Student 3 because the crushed sugar had the highest surface area and temperature.
The chemical formula for cotton is (C₆H₁₀O₅)
How many atoms are there total?
21 total atoms
Combining clear liquids produces a yellow powder.
a. Formation of a gas
b. Energy change
c. formation of a precipitate
c. formation of a precipitate
What 3 factors affect the rate at which a solute dissolves in a solvent?
agitation
temperature
surface area
What elements are in the chemical formula C6H12O6
Carbon
Hydrogene
Oxygen
Draw a picture that successfully identifies the solute, solvent, and solution.
You are loved.
How many atoms are in calcium nitrate? Ca(NO₃)₂
9 total atoms in calcium nitrate.
When salt dissolves in water, does the composition of the salt and water change?
No, the salt and water molecules are still the same.
What is the chemical formula for the universal solvent?
H2O
How many atoms are there total in this chemical formula: Mg4(Ca2B2)2
There are 12 total atoms.
A cup of tea with ice sits outside in the Texas summer heat, which causes the ice to melt.
What TWO actions occurred within the tea solution?
Physical or Chemical change?
Did the concentration increases or decrease?
The ice melted, which is a physical change. The tea has been diluted by the melted ice.