Physical vs Chemical
Give an example of a physical change.
Ex. Cutting wood, dissolving, melting an ice cube, breaking a bottle, etc.
What particles of the atom make up the mass?
Protons and neutrons
Name one difference between groups and periods on the periodic table.
Groups are arranged vertically, periods horizontally.
What are the electrons in the outmost energy level called?
Valence electrons
Why is it important to arrive at the lab on time?
Safety instructions are given at the start of the lab.
What is the diference between a qualitative property and a quantitative property?
Qualitative: described using words
Quantitative: described using numbers
How do you find the number of protons in an atom of an element using the periodic table?
The atomic number is equal to the number of protons.
What is the family name for group 18 elements?
Nobel gases
How many electrons can be in the first energy level?
How many can be in the second and third?
1st energy level: 2
2nd and 3rd energy levels: 8
What should you do if you spill or break something in the lab?
Let the teacher know and tell them what it is you spilled.
Give two examples of a chemical change.
Ex. baking a cake, digesting food, burning paper, milk going sour, chemical reactions. etc.
How do you calculate the number of neutrons of an atom?
Take the atomic mass, round to a whole number and subtract the number of protons.
Explain how to find the number of valence electrons using the periodic table.
Use the group number: elements in group 1 have 1 valence electron, group 2 have 2 valence electrons, group 13 (just use second digit) have 3, etc.
Explain why the elements in group 18 don't become ions.
Elements in group 18 have a complete outer shell. They have 8 valence electrons.
Which was was favourite lab so far? WHY?
Answers will vary (mixtures lab, Tyndall effect lab, physical vs chemical lab).
Explain the difference between a physical and chemical change.
Physical change: appearance or form may change but the matter stays the same.
Chemical change: Matter changes. At least one new substance with new properties if formed.
Name the subatomic particles that make up an atom and describe where they are located.
Protons - in the nucleus
Neutrons - in the nucleus
Electrons - around the nucleus "energy levels"
How do you know if an atom will have a positive or negative charge when it becomes an ion?
If it has 1-3 valence electrons it will lose them and have a positive charge.
If it has 4 or more valence electrons it will gain electrons and have a negative charge.
What is the difference between a cation and an anion?
A cation is an ion with a positive charge. An anion is an ion with a negative charge.
If you spill a chemical such as an acid on your sweatshirt, what should you not do and what should you do? WHY?
Don't take your sweatshirt off because it could spread it onto your skin/face. You should let the teacher know immediately and rinse in the shower for 5 minutes.
Calculate the density of an object that has a mass of 10.0g and a volume of 15.0mL.
D=0.67g/mL
What are the four statements of John Dalton's atomic theory?
Name the elements in the following compound, count how many atoms of each element are present, and give the total number of atoms in the compound:
7H2O (the 2 is a subscript)
14 Hydrogen atoms, 7 Oxygen atoms
Total of 21 atoms
Explain how an atom of carbon would become an ion (how many valence electrons, gain or lose electrons, ion charge).
Carbon has 4 valence electrons. It would gain 4 more electrons and become an ion with a charge of -4.
What does WHMIS stand for?
Workplace Hazardous Materials Information System