01/09/21

Help with chemistry question about polarity of molecules and IMAFs
Carbon dioxide (CO2) has a boiling point of -57C and water (H2O) has a boiling point of 100C. A molecule of CO2 has a mass of 44.0 amu and a molecule of H2O has a mass of 18.0 amu. Why then, if... more
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01/09/21

What type of bonds are found in the substance Ammonium Hydroxide?

What type of bonds are found in the substance Ammonium Hydroxide? Explain how you came to the answer and why.
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01/09/21

Explain, in terms of stable octets of each bonded atom, why fluorine atoms form diatomic molecules when not bonded with other elements, instead of just remaining individual atoms:
Explain, in terms of stable octets of each bonded atom, why fluorine atoms form diatomicmolecules when not bonded with other elements, instead of just remaining individual atoms:
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01/09/21

Which of the following elements form monatomic molecules? Explain.
Which of the following elements form monatomic molecules? Explain.a) Nab) Nc) Ned) NbWhich of the following elements form diatomic molecules? Explain.a) Nab) Nc) Ned) Nb
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01/09/21

Is C6H12O6 formed by covalent bonding?
Is C6H12O6 formed by covalent bonding?a) How are you able to tell this? Explain in terms of types of elements.b) How are you able to tell this? Explain in terms of electronegativity differences.
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01/09/21

The half-life of 237U is 6.75 days. Starting with a 50 mg sample, how much would be left after 54 days?
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01/08/21

Another Chem question I need help with! Please show your work!

A sample of helium gas has a volume of 620mL at a temperature of 500 K. If we decrease the temperature to 100 K while keeping the pressure constant, what will the new volume be?
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01/08/21

he radioisotope cesium-137 has a half-life of 30 years. In 1985, a sample starts at 544 mg. In what year will there be 17 mg left of the original sample?
he radioisotope cesium-137 has a half-life of 30 years. In 1985, a sample starts at 544 mg. In what year will there be 17 mg left of the original sample?
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01/08/21

Some chemistry questions
How many molecules of NH_4NO_3 are there in 20grams of NH_4NO_3? What is the mass in grams of a sample of H_3PO_4 if it contains 1.39x10^23 molecules? A sample of MgCl_2 contains 9.74x10^23... more
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01/08/21

I have no idea how to do these problems
1. In a titration,, 50.0 mL of strontium hydroxide, Sr(OH)2, is neutralized with 34.8 mL of 0.20 M sulfuric acid solution? What is the concentration of strontium hydroxide2.  In a titration of... more
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01/08/21

A tricycle factory gets a shipment with 300 seats and 500 wheels. Using your ideas about Limiting Reactants how many tricycles can be made?

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01/08/21

how much phosphorus can be obtained from 225g of ammonium phosphate?

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01/08/21

It takes 4.90 ✕ 10-19 J of energy to remove one electron from a certain metal surface. What is the maximum wavelength of light capable of causing this effect?
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01/08/21

The half-life of polonium-218 is 3.0 minutes. If you start with 30.0 g, how long will it be before only 3.0 g remains?
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01/08/21

chemistry calculations

what’s the amount of CO2 produced when 93 g of H2CO3 decomposes completely
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01/07/21

how many liters of H2 gas are needed to form 35.5 grams of NH3?
Given N2+3H3=2NH3 , how many liters of H2 gas are needed to form 35.5 grams of NH3?
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01/07/21

I would really appreciate some help on this chemistry question, thank you!
The Kb of a weak base is 1.0 x 10-6. Which of the following is true about its conjugate acid?(A) Ka = 1.0 x 10-20, the conjugate acid is stronger than the weak base.(B) Ka = 1.0 x 10-8, the... more
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01/07/21

Assume that the following reaction is used to buffer the pH of your blood: H2CO3óHCO3-1 + H+1 What would happen in your blood if the pH suddenly increased to 7.6?
  Carbonic acid will react with bicarbonate to produce free H+ ions   Hydrogen ion will combine with bicarbonate ion to form carbonic acid   Carbonic acid will dissociate into bicarbonate and... more
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01/07/21

Substance A has a pH of 5 and substance B has a pH of 7. Which of the following statements is correct?
  Substance B is 20 times more acidic than substance A   Substance A is 10 times more basic than substance B   Substance A is twice as acidic as substance B   Substance B is 100 times less acidic... more
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01/07/21

Carbon has an atomic number of 6 and hydrogen has an atomic number of 1. What type of carbon-carbon bonds will there be in a molecule of C2H4?
  Double covalent bond   Triple covalent bond   Single covalent bond   Ionic bond 
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01/07/21

In a water molecule, the bond between hydrogen and oxygen is __________.
  a polar covalent bond   a hydrogen bond   an ionic bond   a non-polar covalent bond 
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01/07/21

Which of the following statements is FALSE?
Hydrogen bonds make water less cohesive Hydrogen bonds account for water’s high heat capacity Hydrogen bonds can be formed between a slightly positive hydrogen ion and slightly negative oxygen ion 
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01/07/21

During the formation of NaCl, ___________
  Na gains an electron while Cl loses an electron   Na cations are attracted to Cl anions   Na anions are attracted tl Cl cations   Na is covalently bonded to the Cl 
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01/07/21

QUESTION: In a solution of NaCl,
  Sodium cations are surrounded by water molecules such that oxygens are oriented towards the sodium cations.   Chloride cations are surrounded by water molecules such that hydrogens are oriented... more
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01/07/21

Water has a molecular mass of 18 amu. How many molecules of water are there in 18000 milligrams of water?
Water has a molecular mass of 18 amu. How many molecules of water are there in 18000 milligrams of water?  a, 12.04 X 10^23 b,  6.02 X 10^25 c,  18  d,  6.02 X 10^23 e,  100 
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