Lv 1141 points

# Kierstin

• ### Creating energy for consumers is an evolving field. Traditional sources of energy have many benefits and drawbacks?

just like evolving sources of energy. Compare and contrast two types of evolving energy sources in one paragraph.

4.34 x 10^8m

3.12 x 10^7m

4.77 x 10^7m

5.19 x 10^6m

• ### Which of the following types of electromagnetic radiation travel at the speed of light?

Gamma rays

Microwaves

Ultraviolet light

Visible light

• ### Iodine is used to detect and treat thyroid cancer. When iodine-131 gives off a beta particle, what is the new isotope called?

Antimony-127

Tellurium-131

Xenon-131

Xenon-135

20 g

50 g

3.125 g

12.5 g

• ### If diamond has an index of refraction of 2.417, use the equation v = - and the speed of light constant (2.998 108 m/s)?

1.24m/s

1.24 x 10^8 m/s

6.44 x 10^8 m/s

2.998 x 10^8 m/s

• ### Determine the new pressure of a sample of hydrogen gas if the volume and moles are constant, ?

the initial pressure is 6.0 atm, and it is heated from 15°C to 30.°C.

6.3 atm

5.7 atm

12 atm

3.0 atm

• ### Determine the new temperature of a sample of gas ?

if the pressure changes from 0.500 atm to 0.750 atm, and the gas had an initial temperature of 315 K. The volume and number of gas particles is held constant.

210. K

118 K

2.12 x 10-3 K

473 K

• ### Which gas law would you use for the following problem:?

What pressure is required to hold 8.0 moles of oxygen gas in an 8.0 L container at a temperature of 80 degrees Celsius?

Boyle’s Law

Charles’ Law

Combined Gas Law

Ideal Gas Law

• ### How do temperature, concentration, and particle size of the reactants in a reaction relate to the collision theory of chemical reactions?

Consider the following reaction: 2 Mg+CO2<-->2 MgO+C . A laboratory technician wants to increase the amount of MgO produced. Which of the following is the best way to accomplish this?

Increase the amount of carbon.

Decrease the amount of Mg.

Decrease the amount of carbon.

A scientist performs a set of experiments. One experiment involves two compounds at a normal concentration. Another experiment requires the scientist to lower the concentration of both compounds in the experiment. How will the second experiment be different from the first?

The reaction will stop completely.

The reaction rate will not change.

The reaction rate will increase.

The reaction rate will decrease.

A chemist decides that she wants an increased amount of product from an endothermic reaction. Which of the following methods would guarantee that she would achieve her goal, according to Le Chatelier?

Increase product

Increase volume

Decrease pressure

Increase temperature

• ### Indicate the difference between a representative element and a transition element in terms of orbitals being filled.?

Transition elements are filling the s-orbitals. Representative elements are filling d and p orbitals.

Transition elements are filling the d-orbitals. Representative elements are filling s and p orbitals.

Transition elements are filling the s and d-orbitals. Representative elements are filling p orbitals.

Transition elements are filling the p-orbitals. Representative elements are filling d and s orbitals.

• ### What does the law of definite proportions state?

Atoms will always form compounds.

Atoms cannot be created or destroyed.

Atoms will never break bonds in a chemical reaction.

Atoms combine in whole number ratios.