Basic Chemistry
Which two subatomic particles determine the mass number?
Protons and Neutrons
If I changed the number of protons in an element, what would happen? why?
It would become a completely different element. The number of protons is the same as the atomic #.
What type of bond happens between water molecules?
Hydrogen Bond
What is the difference between control variables and control group?
control variables are the things that are constant for both groups. control group is the group not treated or changed.
Is a virus living?
Yes and no, not on its own but yes once with a host.
14C-1
Polar covalent bond, oxygen bonding to hydrogen. Look for electronegativity between 1.7 and 0.4.
The oxygen is attracted to the hydrogens. Opposites attract.
What is the variable that I change?
Independent variable
What are the properties of living things?
Reproduction, living cells, need energy, respond to stimuli, homeostasis and more! :)
2, 8, 8, ...
The number in the outer most shell is the number of valence electrons and tells us if the element is stable or not
Draw the bond between Li and Cl. What type of bond? How do you know?
Ionic bond. One electron gets stolen by the other atom to create 2 happy atoms with full shells. They are both stable. Also electronegativity difference tells us.
When salt dissolves in what what part of the water molecule is attracted to the sodium and which part to the chloride? Why?
Salt and oxygen, Chloride and hydrogen. Opposites attract.
Julia's tired of running slowly. She decides that getting new shoes will make her faster. What is the independent variable and what is the dependent?
I = shoes
D= speed
What belongs in the nucleus?
Protons and neutrons
Sodium gave away an electron so that chloride could be stable, what are the charges of these two ions and how do you know?
Sodium is positive, it gave away one electron and is therefore more positive. Chloride is negative it took one electron and overall is more positive.
H
H-C=C=O
1000 times! pH is a log functions, each jump is worth 10.
What are the steps of the scientific method?
What does it mean to be best fit?
Attributes are most beneficial for the environment you live in.
Explain electronegativity. Use examples and vocabulary in your answer to get full points.
Electronegativity is a measure of an atoms attraction for electrons in a covalent bond. The atom with the highest electronegativity will pull hardest and have a partial negative charge while the one with lower attraction will have a partial positive charge.
Given elements C and F determine what type of bond they would form. Demonstrate your answer with a picture and with an explanation. HINT: Use electronegativity in your answer.
Polar covalent bond, electronegativity difference is 1.5 = polar covalent. F has the partial negative, C has the partial positive.
What are the properties of water and what do they do?
Adhesion: Water sticks to other things
Cohesion: Water sticks to self
High specific heat: Water is hard to change temp of
Cooling
Surface tension
Solid less dense than liquid
Design an experiment. List the independent, dependent, hypothesis, and the control group and variables.
You got this! :)
Can individuals evolve? Why?
NOOOO Silly goose! Only populations evolve!