Chemistry Midterm

Data

100

How many sig figs in 501,340?

Table 3

5

200

What is the number of sig figs in:

0.005034600 mg?

Table 4

7

300

Describe the difference between heterogenous and homogenous mixtures.

Table 2

Heterogenous: Can see various components, easily separated.

Homogenous: Consistent throughout, not easily separated. 

400

What is the difference between accuracy and precision? (A drawing is okay)

Table 1

Accuracy is how close to accepted. Precision is how close to each other.

500

What is the answer to the following:

4.20 x 10⁴ + 1.049 x 10² = ?

Table 3

42100 or 4.21 x 10⁴

Describing Matter

100

How many kilograms in 10.2 g?

0.0102 kg

200

What are the SI units for:

Length, Time, Mass, Temperature, Amount of Substance

Table 4

Meter, Second, Kilogram, Kelvin, Mole

300

What is the difference between ductile and malleable?

Table 1

Ductile- ability to be drawn into wire

Malleable- ability to be hammered into thin sheets

400

If the accepted value is 13.3g, and you measured 17.1g, what is the error AND percent error?

Table 2

Error: 3.8

Percent Error: 28.6%

500

Which laws did John Dalton include in the atomic theory? (hint: three)

Table 1

- Law of conservation of mass

- Law of definite proportion

- Law of multiple proportion

Atomic Structure

100

Why do isotopes go through radioactive decay?

Table 2

Isotopes are looking for stability.

300

What happens during a nuclear reaction?

Table 1

Nuclear reactions change one element into another.

500

What is the alpha decay of: ¹⁸¹ ₇₃ Ta--->?

Table 4

⁴₂He + ¹⁷⁷₇₁ Ta

Electrons and Light

200

What series is the one with phosphor properties? What does phosphor refer to?

Table 2

Lanthanides, ability to emit light

300

What is the unabbreviated configuration for sulfur?

Table 1

1s²2s²2p⁶3s²3p⁴

400

What is the wavelength of a microwave that has a frequency of 4.23 x10⁸ s^-1 ?

Table 4

0.71 m/s

500

What are the three rules that dictate orbital filling?

Table 4

Aufbau rule

Pauli exclusion 

Hunds

Periodic Table

100

What is the label to group 17 elements?

Halogens

200

Is Xe a cation or anion? Why?

Table 2

Neither, Xe is a noble gas and has a full octet.

400

What is the group number, number of valence electrons, and electron dot diagram for Nitrogen.

Table 4

Answer will vary

500

Why are group 1 elements so violent to react?

They want to give up their only valence electron!