Science Homework Help

Calcium reacts with water as shown. Ca(s) + 2H2O(l) → Ca(OH)2(aq) + H2(g) What is the total mass of the solution that remains when 40 g of...

Posted by chisko12 May 21, 2013 at 5:56 AM via web. 1 educator answer. »

8q34.8 refers to a genetic locus. Explain the meaning of this series of numbers and letters.

Posted by inthesummertime May 21, 2013 at 3:35 AM via web. 1 educator answer. »

The function of an exon in a gene is: (Select one) A) forms the coding sequence for a polypeptide.B) may carry part of a coding sequence for a...

Posted by elnor May 21, 2013 at 3:34 AM via web. 1 educator answer. »

A particular human gene has 5 different alleles. Which statement below would also be true? (Select one) A) Each person has 5 copies of this...

Posted by george95 May 21, 2013 at 3:33 AM via web. Be the first to answer. »

Generally, a lab will allow us to do all of the following EXCEPT: A) Find the order of nucleotides in a specific gene.B) Find the order of...

Posted by nikigrays May 21, 2013 at 3:32 AM via web. Be the first to answer. »

OMIM stands for: (Select one) A) Old Mendel's Interesting MindB) Ontogenetic Mophology Inside MammalsC) Outer Membrane Information MoleculeD)...

Posted by faithlovehope May 21, 2013 at 3:31 AM via web. 1 educator answer. »

Where is the proteins on an unsaturated fatty acid

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what is an analogous structure?

Posted by user4510517 May 21, 2013 at 12:57 AM via web. 1 educator answer. »

How viruses reproduce without cells?

Posted by style May 20, 2013 at 11:11 PM via web. 1 educator answer. »

What does a branch point in a cladogram represent?

Posted by klbb18 May 20, 2013 at 10:43 PM via web. 1 educator answer. »

What volume of 0.40 M NaOH would be required to neutralize 100 cm3 of 0.25 M HCl?

Posted by kezze May 20, 2013 at 9:15 PM via web. 1 educator answer. »

1-How is the digestive system affected by constipation? 2-what could you do to prevent or alleviate this health condition

Posted by adilyas May 20, 2013 at 7:07 PM via web. Be the first to answer. »

what are three phsyics concepts for running?

Posted by cinmin May 20, 2013 at 5:11 PM via web. 1 educator answer. »

The H1N1 pandemic in 2009  affected everyone in the world. Did you receive the H1N1 flu vaccine? Why or why not?How did media coverage play a...

Posted by nadaazer May 20, 2013 at 4:46 PM via web. 1 educator answer. »

For successive electron removed from an atom the ionization energy does what  ?

Posted by kierrab May 20, 2013 at 4:00 PM via web. 1 educator answer. »

What is the base of stoichiomtry ?

Posted by andahypp May 20, 2013 at 3:22 PM via web. 1 educator answer. »

constipation is a health  condition that is caused by lifestyle choice 1-identify one specific body system that this condition directly...

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Explain how each piece of evidence you have identify shows that the universe is changing.

Posted by jasma82 May 20, 2013 at 12:32 PM via web. 2 educator answers. »

White phosphorus consists of A a giant structure of atoms. B a giant structure of ions. C small molecules. D single atoms.

Posted by roshan-rox May 20, 2013 at 10:51 AM via web. 1 educator answer. »

In an endothermic reaction in aqueous solution, which of the following is correct?   Temperature           Sign of enthalpy change A...

Posted by roshan-rox May 20, 2013 at 10:50 AM via web. 1 educator answer. »

When 0.635 g of copper (relative atomic mass, RAM = 63.5) is added to an excess ofsilver nitrate solution, 2.158 g of silver (RAM = 107.9)...

Posted by roshan-rox May 20, 2013 at 10:47 AM via web. 1 educator answer. »

Nickel(II) sulfate is prepared by adding an excess of nickel(II) carbonate to 0.010 molof dilute sulfuric acid.NiCO_3(s) +...

Posted by roshan-rox May 20, 2013 at 10:44 AM via web. 1 educator answer. »

Four charges are arranged at the corners of square ABCD.  -2q at A, +2q at D, -q at C and +q at B....

Posted by rocky.goyal May 20, 2013 at 10:10 AM via web. 1 educator answer. »

In general, reactive metals tend to have low ionisation energies and less reactive metals have higher ionisation energies. Why?

Posted by tamanim May 20, 2013 at 9:00 AM via web. 1 educator answer. »

A 0.10 M solution of a weak acid HA turns red in phenol red and yellow in thymol blue. Determine the approximate pH of HA.  

Posted by seventhheaven May 20, 2013 at 8:48 AM via web. 1 educator answer. »

How to construct an ionic equation for the reaction of magnesum and dilute acid.

Posted by tamanimat May 20, 2013 at 8:48 AM via web. 1 educator answer. »

Explain where the carbon, hydrogen and oxygen molecules come from to make glucose(C6H12O6)

Posted by kazz711 May 20, 2013 at 7:53 AM via web. 1 educator answer. »

What do we understand by Oxidation number of oxygen is 1/2 in superoxides?

Posted by spsaroj May 20, 2013 at 7:19 AM via web. 1 educator answer. »

If the pH is 2.5 what is [H3O+] and [OH-] and if pOH is 4.6 what is [H3O+] and [OH-]    

Posted by mpumpkin May 20, 2013 at 2:28 AM via web. 1 educator answer. »

What is the pH of a 0.00750 M H2SO4 solution?

Posted by bec-bec May 20, 2013 at 1:56 AM via iOS. 1 educator answer. »

If I have HCN+H2O<-->H+ + CN and Molarity is  [.5] and Ka of 4.93x10 ^-10   what would [H+] m [OH-], pH, pOH and % of ionization be....

Posted by mpumpkin May 20, 2013 at 12:23 AM via web. 1 educator answer. »

What would be in a letter to The Nursing Times describing a controversial decision, with specific examples of when different treatments are...

Posted by jasma82 May 19, 2013 at 11:27 PM via web. 1 educator answer. »

41g of glass at 95 deg. C is put in 175g of H2O at 21 deg. C in an insulated container. What is the final temp. of the H2O mixture? Spec. heat...

Posted by jokojoko May 19, 2013 at 10:44 PM via iOS. 1 educator answer. »

Explain why different molecules have different sequences of energy in their molecular orbitals?

Posted by kumarvaibhav123 May 19, 2013 at 7:49 PM via web. 1 educator answer. »

Explain how muscles cause movements in a hindge joint?  

Posted by cian1998 May 19, 2013 at 5:46 PM via web. 1 educator answer. »

What does this mean and how do I do it? I have a test tomorrow and I don't understand this...  Give  the  general  formula  and  class...

Posted by madikarrots May 19, 2013 at 4:55 PM via web. 1 educator answer. »

What is the number of atoms in 5g Pb ?  

Posted by econominty May 19, 2013 at 3:05 PM via web. 1 educator answer. »

Name and e xplain acid HBr O 3?

Posted by varka May 19, 2013 at 2:19 PM via web. 1 educator answer. »

which organs are found in which regions of the human body?

Posted by atracy1 May 19, 2013 at 2:18 PM via web. 1 educator answer. »

What is chemical formula for ionic compound with S r &Br .

Posted by jamnette May 19, 2013 at 2:03 PM via web. 1 educator answer. »

Photoelectric effect . What happens to the kinetic energy of the electrons as the intensity of the incident radiation increases?  

Posted by rockstar195699 May 19, 2013 at 9:46 AM via web. 1 educator answer. »

A car of mass 1400 kg is travelling at 25 m/sThe kinetic energy of the car is   A) 17.5 kJ   B) 35.0 kJ   C) 438 kJ   D) 875 kJ

Posted by roshan-rox May 19, 2013 at 5:28 AM via web. 1 educator answer. »

An object of weight 7 N is raised from a height of 2 m to a height of 8 m.The change in gravitational potential energy is   A) 42 J   B)...

Posted by roshan-rox May 19, 2013 at 5:27 AM via web. 1 educator answer. »

What is the difference between pitch and frequency?

Posted by maryam-ahmad May 19, 2013 at 3:39 AM via iOS. 1 educator answer. »

What is the differences between calcination and roasting?

Posted by spsaroj May 19, 2013 at 2:54 AM via web. 1 educator answer. »

Examples of animals with one, two, and three chambered hearts. Compare the efficiences of these with the human 4 chambered heart.

Posted by em444 May 19, 2013 at 12:23 AM via web. 1 educator answer. »

Examples of animals with open circulation systems. Compare these system with the human closed system.

Posted by timid1995 May 19, 2013 at 12:21 AM via web. 1 educator answer. »

Compare and contrast passive transport system (like cnidarian) with active transport systems such as the human circulation system.

Posted by law222 May 19, 2013 at 12:17 AM via web. 1 educator answer. »

Explain the principle of diffusion and active transport in relation to human circulation?

Posted by mark222 May 19, 2013 at 12:07 AM via web. Be the first to answer. »

H2CO3, write the expression for Ka for the acid. Assume only one hydrogen is ionized.  

Posted by bubblelots101 May 18, 2013 at 10:11 PM via web. 1 educator answer. »