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Chemistry

Classify metals based on more reactive, moderate and less reactive

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Chemistry

Why do some transition metals have multiple oxidation states?

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Chemistry

How many moles of sulfuric acid would completely react with 0.30 moles of potassium hydroxide in a titration?

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Chemistry

Four balloons, each with a mass of 10.0 g, are inflated to a volume of 20.0 L, each with a different gas: helium, neon, carbon monoxide, or nitrogen monoxide. If the temperature is 25.0°C and the atmospheric pressure is1.00 atm, what is the density of each filled balloon? (Note: The density of the filled balloon refers to both the contents of the balloon and the balloon itself.)

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Addisyn Franklin

Chemistry

How to tell if a compound is ionic or molecular?

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Chemistry

Which particles in an atom could demonstrate that opposite charges attract?

A.

a neutron and an electron

B.

two protons together

C.

a proton and a neutron

D.

a proton and an electron

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Dustin Wilkerson

Chemistry

The ratio of protons to neutrons may vary but in a neutral atom the number of protons = the number of

a. neutrons

b. electrons

c. positrons

d. protons outside the nucleus

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Chemistry

Illustrate and describe the sequence in which ten electrons occupy the five orbitals related to an atoms d sublevel

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Chemistry

A 40 kg dog is sitting on top of a hillside and has a potential energy of 1,568 J. What is the height of the hillside? (Formula:

PE = mgh)

O 3.9 m

O 40 m

O 39.2 m

O 400 m

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Jessica Parsons

Chemistry

This is an interaction in which two waves meet, matching crest to crest and trough to trough. The resultant wave will have an amplitude of the sum of the two.

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Chemistry

In the lab, you added an excess of acetic acid to drive the reaction forward, favoring products at equilibrium according to Le Chatelier's Principle. Which of the following could you also do to drive the reaction forward and favor products at equilibrium

a. Remove the alcohal starting material

b. Remove exess water

c. Increase the tempature

d. Add extra water

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Chemistry

The term referring to a procedure using an instrument that emits a high-powered beam of light used to cut, burn, vaporize, or destroy tissue is

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Chemistry

The metal aluminum coils in an air conditioner conduct thermal energy from inside the house and release it outside the house. What can be said about the coils when they are accepting the heat inside the house? They must be warmer than the air inside the house. They must be cooler than the air inside the house. They must have more thermal energy than the air inside the house. They must be more insulated than the air inside the house.

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Chemistry

Consider a galvanic cell composed of the SHE and a half-cell using the following reaction: Ag + (aq) + e - → Ag (s)

(a) Calculate the standard cell potential. E o cell = V

(b) What is the spontaneous cell reaction under standard-state conditions?

(c) Calculate the cell potential when [H+] in the hydrogen electrode is changed to the following concentrations, while all other reagents are held at standard-state conditions:

(i) 4.2 * 10-2 M E = V

(ii) 9.6 * 10-5 M E = V

(d) Based on this cell arrangement, suggest a design for a pH meter.

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Lucian Sandoval

Chemistry

Pick one or more of the following combinations to investigate in this activity.

Vinegar and Baking Soda (NaHCO3)

Room Temperature Water and Powdered Washing Soda (Na2CO3)

Vinegar and Table Salt (NaCl)

What chemical combination did you investigate?

Did the observed temperature of the solution increase or decrease?

Based on your observation, was the reaction endothermic or exothermic? Explain your answer using complete sentences.

Describe in detail the relationship between chemical bonds and energy. What must be true of the bonds for a reaction to be endothermic and what must be true for the reaction to be exothermic?

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