4,064 Answered Questions for the topic biology

05/13/21

please help me with chemistry heat math problems

The heat of fusion of ice is 335 J/g. Calculate the heat liberated when 118 g of water at 0°C is frozen.A. -39.5 kJB. 39.5 kJ    C. -2.84 kJD. 2.84 kJE. some other answer
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05/13/21

Please help ,e with chemistry heat math problem.

What is the heat required to melt 62.0 g of solid ammonia, NH3, at its melting point? The ΔH° of fusion of ammonia is 5.97 kJ/mol. Use a molar mass with at least as many significant figures as the... more
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05/13/21

please help me with chemistry heat math problem.

What is the heat required to melt 77.4 g of solid diethyl ether, (C2H5)2O, at its melting point? The ΔH° of fusion of diethyl ether is 7.66 kJ/mol. Use a molar mass with at least as many... more
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05/13/21

Please help me with chemistry math problems

What is the heat required to vaporize 90.8 g of liquid ethanol, C2H5OH, at its boiling point? The ΔH° of vaporization of ethanol is 39.3 kJ/mol. Use a molar mass with at least as many significant... more
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05/13/21

please help me with chemistry and heat
Calculate the amount of heat needed to melt 2.0 kg of iron at its melting point (1809 K) given that: ΔHfus = 13.80 kJ/mol.A. 27,600 kJB. 25,000kJ    C. 494 kJD. 27.6 kJ
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05/13/21

please help me with chemistry and heat

What is the heat required to vaporize 54.3 g of liquid ammonia, NH3, at its boiling point? The ΔH° of vaporization of ammonia is 23.4 kJ/mol. Use a molar mass with at least as many significant... more
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Biology

05/13/21

how many molecules are in 850.2 grams of AuCl

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Biology

05/13/21

Mestruation cycle
Which of the following is a true statement?1.All mammals have menstrual cycles.2.The endometrial lining is.she'd in menstrual cycles but reassured in estrous cycles.3.estrous cycles are more... more
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Biology

05/13/21

Menstruation.cycle
Peaks of LH and FSH production occur during 1.the menstrual.flow phase of the uterine cycle.2.the beginning of the follicular phase of the ovarian cycle.3.the period just before ovulation.4.the... more
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Biology

05/13/21

Muscle weakness in racehorses may sometimes be related to a deficiency of calcium.outline the roles of calcuum ions in the coordination of muscle contraction?
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05/13/21

How cells give shape to our body?

I had a query from almost an year. How do cells of a part of our body, let's say hands, know in what shape to make the hand grow? For example how do the cells know that after the joint near... more
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Biology Science

05/12/21

Please help me on how to do Science DNA punnett squares!
How do you do DNA punnett squares? My science teacher showed me an activity we all have to do but he never really explained it so I'm confused. What I know so far is the fact that Dominant alleles... more
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Biology Science

05/12/21

Please help me on how to do Science DNA punnett squares!
How do you do DNA punnett squares? My science teacher showed me an activity we all have to do but he never really explained it so I'm confused. What I know so far is the fact that Dominant alleles... more
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05/11/21

STOICHIOMETRY - what is the PERCENTAGE YIELD OF ASPIRIN?

Density of Acetic Acid = 1.082 g/mlMass of Salicylic Acid = 5.102 gVolume of Acetic anhydride = 10.00 mlMass of filter paper = 0.0654 gMass of watch glass = 8.677 gMass of filter paper, watchglass... more
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05/11/21

for help in biology chemistry biochemistry zoology botany microbiology Contact 03043535992

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05/11/21

What is the percentage yield of aspirin? (STOICHIOMETRY)
Density of Acetic Acid = 1.082 g/mlMass of Salicylic Acid = 5.102 gVolume of Acetic anhydride = 10.00 mlMass of filter paper = 0.0654 g Mass of watch glass = 8.677 gMass of filter paper,... more
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Biology Biochemistry

05/11/21

Biochemistry regarding TCA, glycolysis cycle etc in bacteria
A new variant of the laboratory strain E. coli has been isolated and requires oxygen for growth. You want to determine what metabolic pathways are active in this organism. It does not accumulate... more
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Biology Science Chemistry

05/10/21

SCIENCE HELP NEEDED!!
SCIENCE HELP NEEDED!!Can You physically remove the different parts of a compound ? true or false Can you vary the amounts being used when creating a mixture ? true or false
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Biology

05/09/21

True or False? One major disadvantage of cloning as a conservation biology strategy is that the genetic variation of a species is not increased through the process.

Is the statement above true or false?
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Biology

05/09/21

T OR F? In the field of restoration ecology, conservation biologists seeks to repair or replace populations and their habitats through complete restoration, rehabilitation, or ecosystem replacement.
In the field of restoration ecology, conservation biologists seeks to repair or replace populations and their habitats through complete restoration, rehabilitation, or ecosystem replacement.Is the... more
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Biology

05/09/21

A forest community consists of not only the trees and shrubs, but also the animals and microorganisms. True or False?
Is the statement above true or false?
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Biology

05/09/21

Breastfeeding confers immunological benefits to the baby. True or False?
Is the statement above true or false?
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Biology Data Data Science

05/09/21

Tukey test help!
Hey,I don't understand what this Tukey test shows. Can someone help me?$`species:treatment` diff lwr upr ... more
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Biology Ecology

05/09/21

What is the role of a keystone species?
What is the role of a keystone species? A Limiting the abundance of a competitively dominant species B Populating the ecosystem to decrease diversity C Exploiting the key resources in an... more
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Biology

05/09/21

A male bittern bird was raised in a cage from birth by a zookeeper.
A male bittern bird was raised in a cage from birth by a zookeeper. At puberty, a female bittern was added to the cage. The male bittern refused the female and instead directed mating behaviors to... more
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