4,347 Answered Questions for the topic Science

Science Chemistry

11/09/21

Heat Transfer/ Specific Heat Problems. Steps on how to do it please.

8750 J of heat are applied to a piece of aluminum, causing a 56.0 oC increase in its temperature. The specific heat of aluminum is 0.9025 J/g x oC. What is the mass of the aluminum?
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Science Chemistry

11/09/21

Heat Transfer/ Specific Heat Problems. Steps on how to do it please.

The specific heat of iron is 0.4494 J/g x oC. How much heat is transferred when a 4.7 kg piece of iron is cooled from 180 oC to 13 oC? Remember you must use the same units so you will have to... more
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Science Chemistry

11/09/21

Heat Transfer/Specific Heat Problems. Step-by-step
How much heat is lost when a 64 g piece of copper cools from 375 oC, to 26 oC? (The specific heat of copper is 0.38452 J/g x oC). Place your answer in k
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11/09/21

Heat Transfer/Specific Heat Problems. Step-by-step
How many joules of heat are required to raise the temperature of 550 g of water from 12.0 oC to 18.0 oC?
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11/08/21

Reduction is the process by which _______.
A. an atom gains electronsB. an atom loses electronsC. negative ions are attracted to the anodeD. positive ions are attracted to the anode.E. positive ions are attracted to the cathode.
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11/08/21

Oxidation is the process by which _______.
A. an atom gains electronsB. an atom loses electronsC. negative ions are attracted to the anodeD. positive ions are attracted to the anode.E. positive ions are attracted to the cathode. 
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Science Chemistry

11/07/21

Science homework Im not sure how to answer this 3 part question

(2.5 points) 1. (a) When a metal was exposed to light at a frequency of 5.74 x 1015 s-1, electrons were emitted with a kinetic energy of 6.97 x 10-19 J. Determine the work function, in kJ/mol.(1.5... more
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11/06/21

Question about the weight of an object in water
A rod made of aluminum is submerged in water. Water density is 1000 kg/m3, aluminum density is 2700 kg/m3. How many times the weight of the rod is greater in the air than in water. Correct answer:... more
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11/06/21

Specific Heat Capacity Show work Please!

When 5800 joules of energy are applied to a 15.2-kg piece of lead metal, how much does the temperature change by?[2.98 degrees] <===Answer
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11/06/21

Specific Heat Capacity Show work Please!
How much energy (in kJ) is lost by a 348-kg iron statue that goes from a temperature of 299 Kto a temperature of 280 K?[-2975 kJ] <===Answer
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11/06/21

Specific Heat Capacity Show work Please!
A heat energy of 645 J is applied to a sample of glass with a mass of 28.4 g. Its temperatureincreases from –11.6 ∞C to 15.5 ∞C. Calculate the specific heat of glass.[0.84 J/g C] <=== Answer
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11/06/21

Specific Heat Capacity Show work Please!

A silver ring has a mass of 138.45 g. How many joules of heat are required to increase the temperature from 11.8 ∞C to 162.5 ∞C?[5007 J]<==== Answer
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Science Chemistry

11/05/21

Can someone please help me with this Chemistry problem? I would really appreciate the help! :)
Which of the following statements is true?A. A lead-acid battery uses a non-aqueous salt bridge.B. An alkaline battery is not rechargeable.C. A lead-acid battery contains several dry cells... more
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11/05/21

Specific Heat Capacity Show work Please!
When 895-J of heat is applied to a sample of iron metal the temperature increases by 55.0 ∞C.Determine the mass of the metal sample to the nearest tenth of a gram. [36.2g] <==== Answer
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11/05/21

Specific Heat Capacity Show work Please!
A water heater warms 35-L (35 kg) of water from a temperature of 22.7 ∞C to a temperature of83.7∞C. Determine the amount of energy (in kilojoules) required.[8933 kJ] <=== Answer
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Science Biology Cells

11/05/21

enumerate examples/situations of transport mechanism that you encounter in your daily lives.

enumerate examples/situations of transport mechanism that you encounter in your daily lives. 
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Science Biology Cells

11/05/21

why is it important to understand the transport mechanism in cells?
why is it important to understand the transport mechanism in cells?
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11/04/21

A salt bridge...
A. is made up of an aqueous ionic compoundB. has positive ions that are attracted to the cathodeC. has negative ions that are attracted to the anodeD. allows the reaction of the galvanic cell to... more
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11/04/21

An atom’s oxidation number changes from –2 to –5. Was the atom oxidized or reduced, and how many electrons were required for the change?
A. Oxidized, 2 electronsB. Oxidized, 3 electronsC. Reduced, 2 electronsD. Reduced, 3 electronsE. None of the Above
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11/04/21

What is the charge that an atom in a molecule would develop if the most-electronegative atoms in the molecule took the shared electrons from the less-electronegative atoms?
A. corrosion factorB. oxidation numberC. oxidation processD. reduction processE. None of the Above
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Science Chemistry Physics

11/04/21

Thermochemistry. Answer, step by step please. (show work)
6) NaHCO3 decomposes into Na2CO3, CO2 , and H2O ∆H = 91.5 kJ a. Write a balanced chemical equation that includes heat as a reactant or product. b. What volume of Carbon dioxide is produced when 314... more
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11/03/21

Thermochemistry. Answer, step by step please. (show work)
Combustion of C8H18(g) ∆H = -5076 kJ a. Write a balanced chemical equation that includes heat as a reactant or product. b. What volume of products can be made if 120 kilojoules are released?
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Science Physics

11/03/21

science physics
What is the energy of a 9kg brick sitting on top of a 75m building? PE = mgh (g=9.8) 
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11/03/21

Thermochemistry. Answer, step by step please. (show work)
1N2 (g) + 3H2 (g) = 2NH3 (g) ∆H = -91.2 kJ a. Is this exothermic or endothermic? b. Rewrite the equation with the energy as either a reactant or a product. c. What quantity of heat is released... more
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Science Chemistry

11/02/21

The planet earth has a volume of 1.1 x 1021 m³ and an average density of 5.5 g/cm³. What is the mass of earth in kilograms?
The planet earth has a volume of 1.1 x 1021 m³ and an average density of 5.5 g/cm³. What is the mass of earth in kilograms?
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