CHEMISTRY HIGH SCHOOL

Which conversion of energy always occurs in a voltaic cell?(1) light energy to chemical energy
(2) electrical energy to chemical energy
(3) chemical energy to light energy
(4) chemical energy to electrical energy

Answers

Answer 1
Answer: The correct answer is option 4. The conversion of energy is from chemical to electrical energy. Voltaic cells are driven by a spontaneous reaction that produces an electric current. Voltaic cells are a type of electrochemical cell.

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2KI + Pb(NO3)2 → 2KNO3 + PbI2 Determine how many grams of KI are required to produce 1.2g of PbI2.

When K2SO4 is separated into its ions, how is it written?

Answers

Answer: K^+ and SO_4^-^2

Explanation: Potassium is a first group metal with one valence electron and so it has +1 charge. Sulfate ion is a polyatomic ion with -2 charge. The compound potassium sulfate has two potassium ions and one sulfate ion and the below equation shows how the ions are written when the compound is dissociated into its ions.

K_2SO_4\rightarrow 2K^++SO_4^-^2
When K2SO4 is separated into its ions, it is written like this.

K2SO4 -> 2K+ + SO4^-2.

This is a balanced equation.

How many moles is 1.50x10^23 molecules of NH3?

Answers

 The   number  of moles that are  1.50  x10^23  molecules of NH3  are  

 =0.249 moles


        calculation

 The number of  moles is calculated  using  Avogadro's  law  constant

that  is  According  to Avogadro's  law

                         1  moles  of a  substance = 6.02 x10^23  molecules

                                    ?    moles                =  1.50  x10^23  molecules


by  cross  multiplication


= [( 1.50  x 10^23  molecules  x  1 moles) / (6.02 x10^23)]  = 0.249  moles

How is the Maunder minimum related to climate?A. Changes in the Earth’s tilt correlate to changes in climate.B. The Maunder minimum is unrelated to climate.C. Changes in the Earth’s orbit correlate to changes in climate.D. Unusually low sunspot activity correlates to unusually cold climatic events.

Answers

I think the correct answer is D. The Maunder minimum is related to climate because it correlates to unusually cold climatic events. This is an event that happened sterting in 1645 to 1715 where very few sunspots were observed. It is also known as prolonged sunspot minimum. During this event, Europe and North America experienced colder temperature than what was usual.

46 What occurs at one of the electrodes in both an electrolytic cell and a voltaic ccl1?( I) Oxidation occurs as electrons arc gained at the cathode.
(2) Oxidation occurs as electrons are lost at the anode.(3) Reduction occurs as electrons are gained at the anode.
(4) Reduction occurs as electrons are lost at the cathode.

Answers

Oxidation occurs as electrons are lost at the anode at one of the electrodes in both an electrolytic cell and a voltaic cell. The answer is number 2. The rest of the choices does not answer the question given above.

Which compound becomes less soluble in water as the temperature of the solution is increased?(1) HCl (2) KCl (3) NaCl (4) NH4Cl

Answers

Answer: Option (1) is the correct answer.

Explanation:

Compounds in which atoms transfer electrons result in the formation of ionic bond. Whereas when atoms in a compound share electrons then they result in the formation of covalent compounds.

Also, it is known that like dissolves like. Hence, water being an ionic compound itself dissolves other ionic compounds.

Thus, out of the given options HCl is a covalent compound, therefore, HCl is the compound that becomes less soluble in water as the temperature of the solution is increased.
HCI are less soluble in water as the temperature of the solution is increased.

Isotopes of the same element have different ____.a. positions on the periodic table
c. atomic numbers
b. chemical behavior
d. mass numbers

Answers

Answer:

d. mass numbers

Explanation:

Isotopes are atoms that have the same number of protons (atomic number) but different number of neutrons. As the definition of mass number is the sum of protons and neutron in an atom, the isotopes have different mass numbers.
The answe is D. Mass number
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