2nd 6 weeks Study Guide Answers

Parts of the Atom

A

C

B

Label the parts of the atom.

Particle Neutron

Location Nucleus

Charge Negative

Year Scientist Contribution

400 BC Democritus Gave us the def. of an atom.

1803 Dalton Billiard Ball Theory

1897 Thomson Plum Pudding Model (Electrons)

1911 Rutherford Gold Foil (positive Nucleus)

1913 Bohr Modern model of the atom, small nucleus that is positively charged with a negative cloud of electrons orbiting it.

Group Examples Reactivity Valence electrons

Alkaline Metals

Li, Sr, VERY Reactive 1

Alkaline Earth Metals

Mg, Ca Not as reactive as group 1, but still reactive.

2

Transition Metals

Hg, Ag, Au Reactivity Varies, but not as reactive as groups 1 and 2

Varies

Non-Metals C, N, O, H, Some are reactive, others aren’t

Varies

Halogens Cl, Br, I Very Reactive. As reactive as group 1

7

Metalloids B, Si Reactivity varies with conditions

3-5

Noble gases He, Ne, Ar Not reactive at all! 8

List and explain the steps of the scientific method

• Write out the formula for density and complete the following calculations: SHOW ALL WORK.

• Calculate the density of a material that has a mass of 52.457 g and a volume of 13.5 cm3.

• A student finds a rock on the way to school.  In the laboratory he determines that the volume of the rock is 22.7 cm3, and the mass in 39.943 g.   What is the density of the rock?

• The density of silver is 10.49 g/cm3.  If a sample of pure silver has a volume of 12.993 cm3, what would the mass?

• How many grams of tin would occupy 5.5 L, if it has a density of 7.265 g/cm3?

Pure gold has a density of 19.32 g/cm3.  How large would a piece of gold be if it had a mass of 318.97 g?

A car is driving 70 mph down the highway. How many m/s is this? There are 1.6 km in a mile.

3.650g =_________kg

450000000mL=________kL

1.3x107 cm=_________m

Describe the differences and similarities between physical and

chemical properties.

• Glass Breaking• Ice Melting• Burning Wood• Air Freshener Evaporating

How did Dmitri Mendeleev organize his periodic table?

How did Henry Mosely organize his periodic Table?

What is the difference between a period and a group?

How do you calculate the number of neutrons in an atom?

How many electrons, neutrons and protons are in the following elements? Element Protons Neutrons Electrons

Oxygen

Nitrogen

Argon

Lithium

Boron

Ms. Milsaps Demo Day

• Types of reactions