MB

10 * log10 ( .95845 / .00845 )

What Law or Theorem allows a technician to calculate power in an electronic circuit?Answer: a. Ohms Law

b. Kirchoff's Law

c. Murphey's Law

d. Markham's Theorem

Kirchhoff’s First Law is used to:

a. Determine the power consumed in a circuit

b. Determine the current in parallel capacitors

c. Determine the speed of electrons in a tank circuit

d. Determine the current in parallel resistors

The result of Macedonian incursions into Greece under Philip II was:

- the waning and eventual collapse of Macedonian power.

- the creation of the Corinthian League, with Philip as hegemon.

- all Greek city-states allying themselves with the Persians.

- the complete destruction of Sparta as a center of Greek power.

At the Battle of Gaugamela

- Alexander was able to win a close victory by bringing up cavalry at the last minute.

- the Greeks under Alexander were able to break the center of the Persian line and with boldness turn the battle into a rout.

- Alexander determined that the battle should be fought on a narrow plain, negating the numbers of the Persians.

- Alexander struck the Persians at their weakest point.

The mystery cults and religions of the Hellenistic world :

- were completely foreign and thus unacceptable to the Greeks.

- helped pave the way for the success of Christianity.

- never achieved widespread popularity due to their inability to fulfill people's spiritual

needs.

- lacked an emotional initiation experience, unlike the Greek civic cults.

In general, separate early Greek communities

developed close ties and cooperated with one another.

exchanged diplomatic representatives only.

avoided all contact to appease their city gods.

became fierce rivals fighting so often as to threaten Greek civilization itself.

The only region to escape Cyrus the Great's invasion and defeat was

Iran.

Egypt.

Asia Minor.

Mesopotamia.

Which of the following statements best describes ancient Hebrew marriage?

Boys and girls married very young as parents did much match-making.

Polygamy was never practiced.

Married women were not subject to their husbands' authority.

Couples could not obtain divorces under any pretext.

The greatest international sea traders of the ancient Near East were the:

Sea Peoples.

Phoenicians.

Carthaginians.

Philistines.

I am doing an online chemisty lab for Oxidation States of Manganese and having some problems. I have three test tubes that have been prepared as follows:

Tube 1- Starting PH 13.82

2 mL of KMnO₄

1 mL of NaOH

Tube 2- Starting PH 7

2 mL of KMnO₄

Tube 3- Starting PH 0

2 mL of KMnO₄

1 mL of H₂SO₄

I then added five 1 mL increments of NaHSO₃to each of the tubes and the reactions are as follows.

Tube 1-

Started as green and turned light green as NaHSO₃is added.

PH 13.65, 13.65, 13.48, 13.13.41, 13.35

Tube 2-

Started as purple with a brown precipitate. Solution turns almost clear as NaHSO₃is added.

PH 7.31, 7.38, 7.41, 7.38, 7.35

Tube 3-

Solution stayed purple and turned light purple with last addition of NaHSO₃.

PH 0,0,0,0,.14

What oxidation states did the MnO₄⁻ and HSO₃⁻ ions change in each test tube?

Write the net ionic equations for the redox reactions in each test tube?

Thanks for any help!

A 4.691 g sample of MgCl2 is dissolved in enough water to give 750. mL of solution. What is the magnesium ion concentration in this solution?

3.70 × 10–2 M

1.05 × 10–2 M

6.57 × 10–2 M

4.93 × 10–2 M

0.131 M

Determine the heat given off to the surroundings when 9.0 g of aluminum reacts according to the equation 2Al + Fe2O3 → Al2O3 + 2Fe, ΔH°rxn= –849 kJ.

7.6 × 103 kJ

2.8 × 102 kJ

1.4 × 102 kJ

5.6 × 102 kJ

2.5 × 103 kJ

The bond angle in Cl2O is expected to be approximately

90°

109.5°

120°

145°

180°

Which of the following properties indicates the presence of strong intermolecular forces in a liquid?

a low heat of vaporization

a low critical temperature

a low vapor pressure

a low boiling point

None of the above.

The normal boiling point of bromine is 58.8°C. Given that the vapor pressure of bromine is 75.0 torr at 2.5°C, calculate the molar enthalpy of vaporization of bromine.

3.76 kJ/mol

31.3 kJ/mol

2.90 kJ/mol

3.57 kJ/mol

29.7 kJ/mol

How many sulfur atoms are there in 21.0 g of Al2S3?

What mass of ethanol, C2H5OH a nonelectrolyte, must be added to 10.0 L of water to give a solution that freezes at –10.0°C? Assume the density of water is 1.00 g/mL. Kf of water is 1.86°C/m.

85.7 kg

24.8 kg

5.38 kg

2.48 kg

1.17 kg

The covalent bond with the greatest polarity would form in which of the atom pairs below?

Br — Br

S — O

C — P

C — O

B — O

Each of the three resonance structures of NO3– has how many lone pairs of electrons?