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Concepts and Definitions
Lewis Dot / Bohr Structures
writing formulas for binary compounds
Atoms and Matter
grab bag
100
What is chemistry?
Is the study of matter, its properties, and its changes or transformations.
100
How many valence electrons does Helium have?
2
100
What is a binary compound?
It is an ionic compound with only 2 elements
100
What is the basis for all matter?
Atoms!
100
What is matter?
anything that has mass and takes up space.
200
Give three examples of evidence for a chemical change.
color change, gases forming (bubbles), precipitate forming, energy change (warmer or colder)
200
What are Bohr Rutherford and Lewis dot structures used for? What is the difference between the two?
A visual representation of an element and its valence electrons. Bohr Rutherford diagrams show the electron shells, as well as neutrons and protons. Lewis structures only show the element's symbol and valance electrons.
200
What is the Roman Numeral in the name of binary compounds for? When are they used?
It shows the charge of the transition metal. For transition metals that have two possible charges.
200
In order for matter to change from solid to liquid it requires what? From liquid to gas?
Energy!
200
What are the states of matter?
Solid, liquid, gas & plasma
300
What are two things that matter can be classified as?
pure substances and mixtures.
300
How many valance shells does chlorine have? How many electrons are on each shell?
3 shells: 2, 8, 7
300
write the binary compound of sodium and chloride in it's empirical formula
NaCl
300
DAILY DOUBLE!! Who was famous for his atomic theory?
John Dalton
300
What differs between isotopes?
Their masses and neutrons
400
What is the difference between a physical change and a chemical change?
A physical change is when the way something looks is changed. They are reversible Chemical properties are the behaviors that happen when a substance changes into a new one, the change itself is called a chemical change. They are very difficult to reverse
400
What are the four steps to making a Lewis Dot Structure
1. Write the symbol for the element 2. Find the amount of valence electrons in the element 3. Place dots at 12, 3, 6, 9 4. Repeat only once if needed
400
What do group 4 and 8 A have in common?
Neither like to loose or gain electrons
400
What are the four states of matter?
plasma, liquid, solid and gas
400
What is the name for Ca(SO4) ?
Calcium sulfate
500
What do the acronyms HHPS and WHMIS stand for? What one would be most helpful to you and your family?
HHPS- hazardous household products symbols WHMIS- Workplace Hazardous Materials Information System HHPS would be most helpful to you and your family
500
What steps are taken to write a Bohr Rutherford diagram?
1. Draw a circle, write how many protons and neutrons there are in that circle, along with the charges for each. 2. Draw the first shell, filling with 2 electrons if present, make on opposite sides. 3. Fill in next 2 with 8 electrons, in pairs of 2 at 12, 3, 6, 9 o'clock. (if present) 4. Fill in rest of shells in the above fashion for 8, 18, 18, 32, 32
500
Write FeCL2 in word form
Iron (II) Chloride
500
A physical change changes the chemical formula and properties of matter. True or false?
False!
500
If there is a reaction between fluorine and lithium and a reaction between fluorine and potassium, which one will be more severe and faster?
Fluorine and potassium will be because potassium is further down the group and is therefore more reactive.