DO NOW – DENSITY REVIEW (SHOW WORK)

1. Find the Density of an object that has a mass of 10g and a volume of 5 cm3.

2. Find the Density of an object that has a mass of 5g and a volume of 10 cm3.

3. Find the mass of an object that has density of 2g/cm3 and a volume of 5cm3.

4. Find the volume of an object that has a mass of 100g and a density of 25g/cm3. D vX

÷ ÷m

D = m ÷ v D = 10 ÷ 5 D = 2 g/cm3

D = m ÷ v D = 5 ÷ 10 D = .5 g/cm3

m = D x v m = 2g/cm3 x 5cm3

m = 10g

v = m ÷ Dv = 100g ÷ 25g/cm3v = 4cm3

HOMEWORK AND ANNOUNCEMENTS

Due Today: vocabulary word find

Science Fair – written summaries and updated forms.

Chapter 9 textbook pages 322-327 (grade tomorrow)

USA TestPrep (due today)

Quarter 1 Extra Credit deadline (Monday 10/26/15)

L.O. SWBAT use the periodic table to determine the number of p+ and e- in an atom.

Using the Periodic Table

Chemical Symbol Represents an element 1 or 2 letters 1st letter capitalized & 2nd

letter lower case Example:

C = Carbon O = Oxygen Co = Cobalt

Non-Example CO = Carbon monoxide (Compound: Carbon and Oxygen)

6

C

12.01

Chemical Symbol

Carbon

1. Oxygen

2. Lithium

3. Beryllium

4. Potassium

5. Argon

6. Chlorine

7. Phosphorus

8. Aluminum

9. Silver

10.Tin

O

Li

Be

K

Ar

Cl

P

Al

Ag

Sn

Use your periodic table to find the chemical symbol for the following elements.

(Write the element and your answer in your notes)

Atomic Number Equals # of protons in

an atom. Equals # of electrons

in an atom. Each element has a

different atomic number.

6

C

12.01

Atomic Number

Carbon

1. Oxygen

2. Lithium

3. Beryllium

4. Potassium

5. Argon

6. Chlorine

7. Phosphorus

8. Aluminum

9. Silver

10.Tin

8

3

4

19

18

17

15

13

47

50

Use your periodic table to find the atomic number for the following elements.

(Next to the chemical symbol, write the # of p+.)

Atomic Number Average mass of an

element’s atoms.6

C

12.01 Atomic Mass

Carbon

1. Oxygen

2. Lithium

3. Beryllium

4. Potassium

5. Argon

6. Chlorine

7. Phosphorus

8. Aluminum

9. Silver

10.Tin

16

7

9

39

40

35

31

27

108

119

Use your periodic table to find the atomic mass for the following elements.

(Write the atomic mass in your notes)

A little math…

Atomic Mass- Atomic Number # of neutrons

6

C

12.01 Atomic Mass

Carbon

Atomic Number

Try it!!

How many neutrons does a carbon atom have?

6

C

12.01 Atomic Mass

Carbon

Atomic Number 12

- 6 6 neutrons

5B

Boron10.81

2He

Helium4.003

11Na

Sodium22.990

17Cl

Chlorine35.453

Raise your hand to answer the following.

1. What is the atomic number for Chlorine?

2. What is the atomic number for Boron?

3. How many protons are in an atom of Na?

4. How many protons are in an atom of He?

5. How many electrons are in an atom of Cl?

6. How many protons are in an atom of Chlorine?

7. What is the atomic mass of Helium?

8. How many neutrons does Helium have?

17

5

11

2

17

17

4

4 – 2 = 2

+

+

+nn

n

n

e-

e-

e-

What do you see?Protons:____Electrons: ____Neutrons:____Mass Number: ________

What do you know?Atomic Number: ____Element Name: ________Chemical Symbol:____Avg. Atomic Mass: _____

e- + n

Practice

What do you know!

101012

p+ + n = 22

10

NeNeon

20.18

e-

e-

e-

e-

e-

e-+

+++

+

+

n

n

n

n

n

n

n

Hints:

p+ = 10n = 12mass number = (p+) + n

Summary (3-4 sentences)

Today I learned about…

Helper questions How do we determine the number of p+ an atom has?

Electrons?Netrons?

Independent Work

Textbook Pages 322-327 Vocabulary Word Find

definitions (in notebook)