Chapter 1
If you leave a gallon of milk in the fridge for 3 months, does a physical or chemical change take place?
Find out how many protons, neutrons, and electrons are in carbon.
6 protons, 6 electrons, 6 neutrons
What makes up the nucleus in an atom?
JJ Thomson
What are metals? Give an example.
Shiny, conduct heat and electricity well, usually solid.
Convert 2.3 miles into picometers.
3.7 x 10^15 pm
If you change the atomic number of an element, does anything happen? Can carbon have an atomic number of 13 instead of 6?
No! Changing the number of protons changes the element.
Are electrons attracted to protons?
Yes.
Dmitri Mendeleev
What are metalloids?
Staircase. Have properties of non-metals and metals.
A giraffe can be 5.8 meters tall. How many feet is this? 2.54 cm = 1 inch.
19 feet
What is the atomic number of gold?
79
What happens if you add more electrons to an atom?
The atomic radius expands as the electrons repel one another.
Who discovered radium?
Marie and Pierre Curie
Do noble gases react? Name a noble gas.
No, they are inert. Xenon.
Is mixing vinegar and baking soda a chemical or physical change?
Chemical
You have 13 electrons, 13 protons, and 14 neutrons. What element is this?
Aluminium
What is an ion?
Atom that has a different number of electrons. Can be positive or negative.
Most electronegative element?
Flourine
Helium.
Convert 3.283 km/hr into miles/s.
5.667 x 10^-4 miles/s
Can the number of neutrons in an element change?
Yes! This is an isotope.
What do you call it when an atom has less or more electrons? Specifically, what type of ion?
More electrons: anion
Less electrons: cation
What element makes up 78% of the air?
Nitrogen
As you go down the periodic table, does atomic size increase or decrease?
Increase.