4,374 Answered Questions for the topic Science

10/17/20

What is the enthalpy change for this reaction?
When 50 mL of 1.00 M  was added to 50 mL of 1.00 M NaOH in a coffee-cup calorimeter, the temperature of the resulting solution increased by 4.5 . The enthalpy change for the neutralization isa.... more
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10/17/20

Find the DeltaH?
What is ΔHneut when 50.0 mL of 1.0 M HCl react with 40.0 mL of 1.0 M NaOH to produce a temperature change of +5.6 ? ​[math] d{soln} = 1.05 g/mL, c{sol} = 4.20 J/g. K
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Science Cell Theory

10/16/20

Are all living things made up of cells
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10/16/20

Physics, 5 questions

1. The force of a surface pushing back on an object is called the _____ force?a. gravityb. normalc. tensiond. friction2. the force of a rope, string, or similar object pulling on an object is... more
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10/16/20

Coffee-Cup calorimeter? Please check my answer! :)
When a neutralization reaction is carried out in a coffee-cup calorimeter, the temperature of the solution after reaction, Tf, would beaCannot determinebLowercThe... more
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10/16/20

Temperature reading.
You will be performing your experiment in a coffee-cup calorimeter and measure temperature changes upon reaction in the calorimeter. Given that ΔHneut = -56 kJ/mol, for a neutralization reaction of... more
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10/16/20

Temperature change? Check my answer please.
Predict how the temperature change that you measure for 25 mL of 1 M NaOH added to 25 mL of 1 M hydrochloric acid compare to the temperature change when 50 mL of 1 M NaOH is added to 50 mL of 1 M... more
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Science

10/16/20

A metal object has a mass of 1450 g and displaces 542 mL of water rumors. Calculate the density of this object.
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10/16/20

Predict the temperature change?
Predict how the temperature change that you measure for 25 mL of 2 M NaOH added to 25 mL of 2 M hydrochloric acid compare to the temperature change when 25 mL of 1 M NaOH is added to 25 mL of 1 M... more
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Science Chemistry

10/16/20

Isothermal Titration Calorimeter
Is it much like a coffee cup setup? Can it detect the heat absorbed or released from a chemical reaction? Can it be used to heat and melt metals? Can the instrument object a small volume of... more
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10/16/20

Which of the following reactions will lead to the largest temperature change in the calorimeter?
Which of the following reactions will lead to the largest temperature change in the calorimeter?a25 mL of 2 M NaOH added to 20 mL of 2 M HCIb50 mL of 1 M NaOH to 25 mL of 1 M HCIc25 mL of 2 M NaOH... more
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10/16/20

AP ENVIRO QUESTIONS PLS HELP!
You purchase a television at a substantial discount from a large chain store. Explain how the price would have changed if the store had priced the television at full cost. Describe three different... more
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10/15/20

AP Environmental Science Questions PLS HELP!
Explain why a hunter-gatherer lifestyle is unable to support efforts and activities of an industrial society. In your answer, you should consider factors such as nutritional requirements, resource... more
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Science Chemistry Physics

10/15/20

Help please!!!!
In August 2001, there were approximately 2 million people living in Apple City. In August 2011, that population grew to 6 million people. How many more people lived in Apple City in 2011 in... more
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Science

10/15/20

What is the relationship between Force and Acceleration
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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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