Show:
Basic Chemistry
Molecules and Bonds
Water and pH
Scientific Method
Miscellaneous
100

Which two subatomic particles determine the mass number? 

Protons and Neutrons

100

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 #.

100

What type of bond happens between water molecules?

Hydrogen Bond

100

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. 

100

Is a virus living?

Yes and no, not on its own but yes once with a host.

200
What is going on with this element?



14C-1

It is an isotope of Carbon and it is an anion.
200
What is the bond that has unequal sharing of electrons? Can you give an example of two elements that would create this bond?

Polar covalent bond, oxygen bonding to hydrogen. Look for electronegativity between 1.7 and 0.4.

200
When water molecules bond, what part is attracted to what? Draw a picture to support your answer. 

The oxygen is attracted to the hydrogens. Opposites attract. 

200

What is the variable that I change?

Independent variable

200

What are the properties of living things?

Reproduction, living cells, need energy, respond to stimuli, homeostasis and more! :) 

300
How many electrons belong in each shell of an atom and what does the number in the outer most shell tell us?

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

300

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. 

300

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.

300

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

300

What belongs in the nucleus?

Protons and neutrons

400

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. 

400
Using the molecular formula C2OH2, and without your notes, draw a possible structure for the molecule. (Do not draw a dot diagram! Draw the structure!)

    H

H-C=C=O

400
pH 3 is how many more times acidic than pH 6? How do you know?

1000 times! pH is a log functions, each jump is worth 10.

400

What are the steps of the scientific method?

Notice a problem, hypothesis, experiment, analyze data, communicate results
400

What does it mean to be best fit?

Attributes are most beneficial for the environment you live in. 

500

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. 

500

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. 

500

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

500

Design an experiment. List the independent, dependent, hypothesis, and the control group and variables. 

You got this! :)

500

Can individuals evolve? Why?

NOOOO Silly goose! Only populations evolve!