4,347 Answered Questions for the topic Science

Science Biology

10/14/20

8th Grade Science

Can a Compound and a Mixture be separated by physical means?
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Science

10/14/20

A block of wood 3cm on each side has a mass of 54g what is the density of this block?

(Hint! Don’t forget the volume! :] )
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10/14/20

Creating Dichotomous Keys
I need help making a dichotomous key for archaea and protists. It can be for specific species or for groups/subgroups of the kingdoms.
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10/14/20

Calculating heat of reaction from bomb calorimetry data?
A student runs two experiments with a constant-volume "bomb" calorimeter containing 1500.g of water.First, a 7.000g tablet of benzoic acid (C6H5CO2H) is put into the "bomb" and burned completely in... more
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10/14/20

Dichotomous Key
I need help making a dichotomous key for: archaea and protists. It can be for specific species or for groups/subgroups of the kingdoms.
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10/14/20

mixture? reactions?
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant... more
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10/14/20

Reactions? One question.
A chemist measures the energy change ΔH during the following reaction:CH4(g) + 2O2(g) --> CO2(g) + 2H2O(l) DeltaH: -882. kJUse the information to answer the following questions. Is the... more
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10/13/20

reactions, confused
A chemist measures the energy change during the following reaction:2NH3(g) --> N2(g) + 3H2(g) DeltaH: 160.kJUse the information to answer the following questions. Is the reaction endo- or exo-... more
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10/13/20

MIXTURE Reactants
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant... more
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10/13/20

Reactions - CONFUSED, urgent
A chemist measures the energy change during the following reaction: 2NH3(g) --> N2(g) + 3H2(g) DeltaH: 160.kJUse the information to answer the following questions. Is the reaction endo- or... more
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10/13/20

Reaction, urgent.
A mixture of gaseous reactants is put into a cylinder, where a chemical reaction turns them into gaseous products. The cylinder has a piston that moves in or out, as necessary, to keep a constant... more
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10/13/20

Reaction question, urgent
A chemist measures the energy change during the following reaction:C3H8(g) + 5O2(g) --> 3CO2(g) + 4H2O(l) DeltaH = -2220 kJUse the information to answer the following questions.--- Is the... more
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10/13/20

Help me analyze this poem in a paragraph!?
A Small Needful FactRoss GayIs that Eric Garner workedfor some time for the Parks and Rec.Horticultural Department, which means,perhaps, that with his very large hands,perhaps, in all likelihood,he... more
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10/13/20

Help me analyze this poem in a paragraph!!?
For What Binds UsJane HirshfieldThere are names for what binds us:strong forces, weak forces.Look around, you can see them:the skin that forms in a half-empty cup,nails rusting into the places they... more
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10/12/20

Can someone help me please?
A 45 year-old woman complaining of breast pain was diagnosed with having HER2-positive breast cancer. The patient underwent lumpectomy followed by a period of chemotherapy including adjuvant... more
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10/12/20

How to answer this question?
A 45 year-old woman complaining of breast pain was diagnosed with having HER2-positive breast cancer. The patient underwent lumpectomy followed by a period of chemotherapy including adjuvant... more
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10/12/20

Two questions related to antacids
In this experiment, the relative ‘strength’ of commercial antacids at neutralizing stomach acid is determined by titration with standard NaOH solution. The parietal cells (the acid secreting cells)... more
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10/12/20

Balanced Net Ionic Equations with Antacids:
Write a balanced net ionic equation for the neutralization of hydrochloric acid with each of the antacids. Alka-Seltzer: Equate: Gaviscon: Maalox (tablet): Milk of Magnesia: Rolaids:
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10/12/20

Can someone tell me how I should answer this question?
A 45 year-old woman complaining of breast pain was diagnosed with having HER2-positive breast cancer. The patient underwent lumpectomy followed by a period of chemotherapy including adjuvant... more
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10/12/20

Organic Chemistry - ALKANES

Industrial preparation of alkanes involves:a)   fractional distillation  c) alkylationb)   polymerization          d) all of the abovE
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10/11/20

Calculate the heat?
A gas tank in a home barbeque contains 13.2 kg of propane, C3H8, (44.1 g/mol). Calculate the heat (in kJ) associated with the complete combustion of all of the propane in the tank given the... more
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Science Physics

10/11/20

A cube is placed in a pool of water. If the cube is 94 cm long on each side, what is the weight of the cube?
A cube is placed in a pool of water. If the cube is 94 cm long on each side, what is the weight of the cube? (Use 1000 kg/m3 for the density of water)
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Science Physics

10/11/20

A 500 kg weather balloon is designed to lift a 1600 kg package.
A 500 kg weather balloon is designed to lift a 1600 kg package. Remember, Weight = mass * 9.8 and Density = [total mass]/[volume of water displaced]  What is the total mass of the balloon and the... more
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Science Physics

10/11/20

Helium has a density of 0.1786 kg/m3, and air has a density of 1.275 kg/m3. If a balloon is filled with 0.1 m3 of helium
Helium has a density of 0.1786 kg/m3, and air has a density of 1.275 kg/m3. If a balloon is filled with 0.1 m3 of helium, how heavy can the balloon itself be before it will no longer float? What is... more
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10/10/20

Is work (w) being done on the gas or by the gas in the cylinder? Will the sign of work be >0 or <0?
Consider a gas enclosed in a cylinder with a piston. If the gas is compressed by lowering the piston, is work (w) being done on the gas or by the gas in the cylinder? Will the sign of work be >0... more
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