If something is MATTER it must have a _____ and a take up ___________
have a MASS and take up SPACE (volume)
100
What subatomic particles contribute to the MASS of an atom?
protons and neutrons
100
What is the name of column 7A.
Are most of these elements solids, liquids or gases?
Halogens - gases!
100
How many chloride atoms are in MgCl2
2
100
What country was Mendeleev from?
Russia
200
List 2 things that are definitely NOT matter
lots of options!
200
An atom has 4 protons, 3 neutrons and 4 electrons.
What is its mass?
7 amu
200
What is the name of the alkaline earth metal in period 3.
Magnesium
200
During a chemical reaction, atoms cannot be ....
created or destroyed
200
Who was the Quaker school teacher who was a boy genius and contributed greatly to the development of the atom?
John Dalton
300
List 3 physical properties of a golden necklace
solid, gold color, malleable, shiny, hard, certain mass, certain volume, smooth
300
If an atom has more protons than electrons, will its charge be NEUTRAL, POSITIVE or NEGATIVE?
explain your thinking
POSITIVE
300
List the family and for Argon
noble gases (8A)
period 3
300
What are 3 signs that a chemical reaction may have occurred?
color change, gas is produced, solid is formed, smoke, burning,
300
What is the only element that is RED at room temperature?
Bromine (and it's a liquid!)
400
The density of an object is 4.5 g/mL. If the object has a mass of 40 grams, what is its volume?
8.88 mL
400
Draw a sketch of JJ Thompson's plum pudding model of the atom (the chocolate chip cookie model).
List 2 major differences between JJ's model and the more current model of the atom
JJ didn't know there was a nucleus. JJ didn't know about protons or neutrons
400
What is the least reactive alkali METAL?
lithium
(hydrogen is not a metal!)
400
A block of gold melts at almost 200 degrees Fahrenheit. Jewelers have large ovens in which they can melt gold to fill molds.
When jewelers melt gold into liquid form, are they performing a chemical reaction? Explain your answer
NO! Phase changes are only physical changes. The atoms are not rearranged, they are just moving faster
400
What is the most abundant element on earth?
oxygen
500
Liquid A has a density of 1.2 g/mL
Liquid B has a volume of 3.1 mL and a mass of 2.7 grams.
Which liquid will sink to the bottom of the flask?
Liquid A - more dense
500
An atom has a mass of 44. It contains 21 electrons. It has an overall charge that is neutral.
How many protons and neutrons does this atom contain?
21 protons.
23 neutrons.
500
List the atomic number, mass number, family and phase of cesium.
55, 133, alkali metal, solid
500
The mass of all the reactants before a reaction is 85 grams. After the reaction, there are 75 grams of a white chalky solid. There are also 17 grams of water and _____ grams of gas. How many grams of gas are produced?
8 grams of gas
(conservation of mass!)
500
A young girl name Poorvie Choundhary can recite all the elements in the fastest time in the world. How long does it take her to say all the names?