Questions and answers by

krystal

Questions (113)

what is 136 in exspanded form
1. 1 answer
2. 213 views
need to make a silent proof box 15,000 cubic centimeters. What is the dimensions?I am having a hard time figuring it out.
1. 1 answer
2. 491 views
Value ways 2 3/5 miles each day.Bill runs 10 miles once every 4 days. In 4 days, who covers the greater distance?
1. 3 answers
2. 583 views
what are city states?
1. 1 answer
2. 403 views
list three environmental challenges facing the acient people of mesopotamia.
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2. 563 views
I need this paragraph proof read if that's OK.also need to know if it's a fully devolved the topic a high school diploma is
1. 2 answers
2. 962 views
How many moles of hno3 neede to prepare 7.5 l of a 5.6m solution
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2. 352 views
if Royce was 10 years old and he had a mass of 30kg. but by the time he turned 16 his mass has grown to 60kg. how much larger is
1. 2 answers
2. 2,257 views
At a distance of 100 feet, the angle of elevation from the horizontal ground to the top of a building is 42 degrees. Find the
1. 2 answers
2. 1,266 views
What is the net charge on Phe-Asp at each pH?a. pH 1 b. pH 7 c. pH 14
1. 1 answer
2. 1,464 views
a. What is the net charge on valine at pH 1?b. at pH 7? c. at pH 14?
1. 0 answers
2. 806 views
Why does a change in pH usually produce a change in the ability of an enzyme to act as a catalyst?A. When the pH changes, the
1. 0 answers
2. 443 views
Why does a change in pH usually produce a change in the ability of an enzyme to act as a catalyst?A. When the pH changes, the
1. 1 answer
2. 529 views
What is the net charge on Phe-Asp at each pH?a. pH 1 b. pH 7 c. pH 14
1. 0 answers
2. 452 views
a. What is the net charge on valine at pH 1?b. at pH 7? c. at pH 14?
1. 0 answers
2. 1,137 views
Why does a change in pH usually produce a change in the ability of an enzyme to act as a catalyst?A. When the pH changes, the
1. 1 answer
2. 1,685 views
Benedict's reagent is used for detecting reducing sugars because _________.the —OH groups are exchanged for hydrogens. the
1. 1 answer
2. 944 views
Benedict's reagent is used for detecting reducing sugars because _________.the —OH groups are exchanged for hydrogens. the
1. 1 answer
2. 1,652 views
Calculate the interest due on the following credit card balances.a)An unpaid balance of $1623.53 at a rate of 19.50% for 21
1. 0 answers
2. 500 views
Calculate the amount of interest earned in 10 years on $1000 invested at 3.00% per annum, compunded annually?
1. 1 answer
2. 502 views
Calculate the final value after 10 years if you invest 5000.0 at 2.5% per annum compunded annually?
1. 0 answers
2. 414 views
The kinds of interactions that exist between CH3COOH moleculesinclude dipole-dipole (including hydrogen bonding) interactions
1. 1 answer
2. 1,415 views
True or false? Constitutional isomers and conformations have the same molecular formula.
1. 2 answers
2. 1,316 views
Choose the type of shape that best matches to CH4.Linear Trigonal planar Bent Tetrahedral Pyramidal
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2. 716 views
True or false? Constitutional isomers and conformations have the same molecular formula.
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2. 911 views
Can you check this for grammar mistakes?By taking a Modern World Literature class, one should expect to read novels about
1. 1 answer
2. 501 views
do hydrogen bonds form between methanol (CH3OH) molecules?no, because methanol does not contain fluorine or nitrogen atoms yes,
1. 1 answer
2. 710 views
Which has the higher boiling point?(a) CH3CH2CH2CH2CH3 or (b) CH3CH2CH2CH2CH2CH2CH2CH3
1. 3 answers
2. 2,578 views
Which of the molecules can form a hydrogen bond with a water molecule?1. CH3OH 2. CH2=CHCH3 3. CH3CH2SH 4. CH3OCH3
1. 1 answer
2. 2,701 views
Do hydrogen bonds form between methanol (CH3OH) molecules?
1. 1 answer
2. 532 views
Indicate the number of covalent bonds that each nonmetal atom is expected to form.a. Se is expected to form 2 covalent bonds. b.
1. 2 answers
2. 1,498 views
Calculate the pH of a 0.0019 M HNO3 solution.2.7
1. 1 answer
2. 586 views
a. How many moles of NaOH are present in 89.6 mL of 0.714 M NaOH?6.40E-2 b. How many moles of HCl are present in a 30.0 mL
1. 0 answers
2. 446 views
As the pH of a system decreases:the [H+] decreases the Kw decreases the [OH-] decreases all of the above
1. 3 answers
2. 1,260 views
Calculate the pH of a 0.0019 M HNO3 solution.
1. 1 answer
2. 1,003 views
alculate the H3O+ concentration present in water under the following conditions. Enter your answer in scientific notation.a.
1. 1 answer
2. 405 views
ndicate whether each solution is acidic, basic, or neutral.a. [H3O+] = 6.9 x 10-1 M This solution is acidic. b. [H3O+] = 8.2 x
1. 1 answer
2. 627 views
CH4 + 2 O2 = CO2 + H2OCarbon is being oxidized Oxygen is being reduced
1. 1 answer
2. 624 views
In this equation is Fe(OH)3 and NaCL a solid liquid gas or aqueous?FeCl3 (aq) + 3NaOH(aq)=Fe(OH)3+NaCl
1. 1 answer
2. 4,054 views
What is reduced and what is oxidized in the reaction?2Mg+O2=2MgO Oxygen is oxidized Mg is reduced
1. 2 answers
2. 1,791 views
alculate the H3O+ concentration present in water under the following conditions. Enter your answer in scientific notation.a.
1. 0 answers
2. 402 views
alculate the H3O+ concentration present in water under the following conditions. Enter your answer in scientific notation.a.
1. 1 answer
2. 436 views
Indicate whether each solution is acidic, basic, or neutral.a. [H3O+] = 6.9 x 10-1 M This solution is acidic. b. [H3O+] = 8.2 x
1. 1 answer
2. 761 views
Give the formula for the conjugate base of each acid.a. HSO4- SO4^2- b. H3PO4 H3PO4 c. HPO42- PO4^2- d. HNO3 NO3^-
1. 3 answers
2. 1,610 views
In the reaction below:Increasing the concentration of Cl2 will _____ at equilibrium. HAVE NO EFFECT
1. 2 answers
2. 2,567 views
Which is the conjugate base of the bicarbonate ion, HCO3-?CO3 2-
1. 1 answer
2. 1,094 views
Water is amphoteric (can act as an acid or a base).a. Complete the chemical equation that shows water acting as a base. H2O +
1. 1 answer
2. 751 views
Give the formula for the conjugate base of each acid.a. HSO4- H2SO4- b. H3PO4 H4PO4 c. HPO42- H2PO42- d. HNO3 H2NO3
1. 2 answers
2. 3,139 views
Explain how you would prepare a saturated aqueous solution of table sugar.Heat the solution to near its boiling point. With
1. 1 answer
2. 693 views
A water sample taken from the ocean is 36 ppt salt content. What is the mass of salt present in a liter of this ocean water?36g
1. 1 answer
2. 1,370 views
Assuming additive volumes, what will be the molarity of the solution that results when 35.5 mL of 2.00 M HNO3 is added to 214.5
1. 1 answer
2. 1,753 views
How many milliliters of 0.729 M NaOH are needed to prepare 150.0 mL of 0.122 M NaOH?25.1 mL
1. 1 answer
2. 462 views
If 19.7 g of CaCl2 are present in 200 mL of aqueous solution, what is the concentration in terms of the following?a. molarity
1. 1 answer
2. 1,040 views
Calculate the molarity of each.a. 1.50 mole of NaCl in 8.00 L of solution 0.188 M NaCl b. 270 mg of NaCl in 3.00 mL of solution
1. 1 answer
2. 611 views
Potassium iodide (KI) is used to treat iodine deficiencies. What is the %(w/v) of a 55 mL solution containing 1.3 g of KI?0.024
1. 1 answer
2. 391 views
Explain why an opened bottle of carbonated water keeps its fizz longer if kept in a refrigerator than if kept at room
1. 3 answers
2. 2,178 views
What happens to the solubility of oxygen gas (O2) in water in each situation?a. The pressure of O2 over the solution is
1. 4 answers
2. 2,032 views
A pan full of hot salt water, NaCl(aq), is cooled and NaCl(s) precipitates. Explain why this happens.Chloride ions are more
1. 4 answers
2. 1,809 views
At which temperature is NaCl more soluble in water, 0°C or 90°C?0°C 90°C
1. 1 answer
2. 543 views
A bottle of 80 proof alcohol is 40% ethanol and 60% water. What is the solvent in this solution?water
1. 1 answer
2. 1,575 views
a. Listening to the weather report, you hear that the barometer is falling. What part of the barometer is falling?The level of
1. 1 answer
2. 760 views
If hydrated sodium carbonate contains 6.0 g of carbon, find its mass.
1. 1 answer
2. 347 views
What mass of potassium chloride, a salt substitute often used by heart patients, can be produced directly from 5.2 g potassium
1. 1 answer
2. 1,009 views
Aluminum and oxygen react to form aluminum oxide.4 Al + 3 O2 2 Al2O3 a. What is the limiting reactant if 36.4 g Al are reacted
1. 1 answer
2. 1,040 views
Mercury reacts with oxygen to produce mercury(II) oxide.Hg(l) + O2(g) → HgO(s) a. Balance the reaction equation. Include
1. 2 answers
2. 6,817 views
Consider the following reaction.4Fe + 3O2=2Fe2O3 a. How many moles of O2 are required to react completely with 29.8 mg of Fe?
1. 1 answer
2. 865 views
1-Butene (CH2=CHCH2CH3) burns in the presence of O2 to produce CO2 and H2O. Write the balanced chemical equation for this
1. 1 answer
2. 1,140 views
Aluminum metal reacts with oxygen gas (O2) to form aluminum oxide.a. Write a balanced equation for this oxidation-reduction
1. 5 answers
2. 2,338 views
How many moles of aspirin are present in 100 mg of aspirin? Enter your answer in scientific notation.5.5E-4
1. 3 answers
2. 446 views
Consider the following reaction.2KClO3(s) → 2KCl(s) + 3O2(g) a. How many grams of KCl are produced from the complete reaction
1. 1 answer
2. 860 views
For the combustion of ethane, beginning with 2.6 mol of CH3CH3,2CH3CH3(g) + 7O2(g) → 4CO2(g) + 6H2O(g) a. how many moles of O2
1. 1 answer
2. 996 views
For the reaction between nitrogen and oxygen to form nitric oxide, beginning with 0.067 mol of N2,N2(g) + O2(g)= 2 NO(g) a. how
1. 3 answers
2. 2,037 views
is cappuccino masculine or feminineis giorno masculine or feminine
1. 1 answer
2. 838 views
Magnesium reacts with iron(II) chloride according to the equationMg(s) + FeCl2(aq) → MgCl2(aq) + Fe(s) a. Is magnesium
1. 3 answers
2. 7,811 views
a. Cl2 + 2NaI → 2NaCl + I2This is a single replacement reaction. b. 2K + 2HCl → 2KCl + H2 This is a single replacement
1. 2 answers
2. 4,248 views
a. What is the molecular weight of aspirin (C9H8O4)?180.1574 amu b. What is the mass of 0.00785 mol of aspirin? 1.41 g c. How
1. 1 answer
2. 845 views
What is the formula weight of ammonium oxide?44.0 g/mol 52.1 g/mol 34.0 g/mol 30.0 g/mol Is it 34.0 g/mol
1. 1 answer
2. 413 views
Which of the following atom pairs would most likely be connected by a covalent bond?K and F O and Cl Na and O Na and Cl
1. 5 answers
2. 2,584 views
What is the formula weight of Li2CO3?73.891 amu b. What is the mass of 1.30 x 10-4 mol of Li2CO3? 9.61E-3 c. How many moles of
1. 3 answers
2. 1,948 views
Name each of the following ionic compounds or binary molecules.a. SF2---Sulfur difluoride b. MgF2---Magnesium fluoride c.
1. 2 answers
2. 1,669 views
Predict the number of covalent bonds formed by each nonmetal atom.a. N-----3 bonds b. Cl-----1 bond c. S-----2 bonds
1. 1 answer
2. 1,055 views
Name each binary molecule.a. CS2 Carbon Disulfide b. N2O3 Dinitrogen trioxide c. NF3 Nitrogen trifluoride
1. 1 answer
2. 556 views
Write the formula of the ionic compound that forms betweena. copper(I) ions and chloride ions---CuCl b. copper(II) ions and
1. 1 answer
2. 1,823 views
Which of the following atom pairs would most likely be connected by an ionic bond?K and Br S and Br O and Br F and Br
1. 1 answer
2. 2,529 views
An antibiotic is sold in 4.0 mL ampoules that contain 60.0 mg of drug (60.0 mg/ 4.0 mL). How many milliliters of the antibiotic
1. 1 answer
2. 408 views
describe the reconstruction period and how is happened and if it had any gains. i have to post this a paragraph at a time. sorry
1. 5 answers
2. 768 views
Describe a major result of the civil war and assess whether it was good or bad for the country....i choose slavery ending but
1. 1 answer
2. 536 views
What was the Johnson Administration's policy on civil rights? state an example
1. 3 answers
2. 560 views
True / FalseIf false change the word in ( ) i missed several of these and i need to turn it in again and i don't know which ones
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2. 440 views
True/false and if false change the word in ( )The process of handing out jobs to one's supporters is known as the (citizen
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2. 383 views
what is the mood in animal farm?
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2. 443 views
I need to find a climatogram of Puerto Rico for my project. I've gone on several different sites for puerto rico and several
1. 1 answer
2. 567 views
i am doing decimals and its estumating decimal prouducts can you help this is the question: 6.3 x 17.59
1. 2 answers
2. 338 views
Now imagine that you are conducting research on the length of time it takes customers to select items in a grocery store. Assume
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2. 1,442 views
how long does it take a softball to cross homeplate at 43 feet if the ball is going 65 miles per hour?
1. 1 answer
2. 932 views
A cup of coffee a 10-gallon aquarium and a bottle of ginger ale were on the same table On which container was there the greatest
1. 4 answers
2. 1,116 views
List the characters in the story. Write one to two sentences on the defining characteristics of each one, providing at least one
1. 1 answer
2. 608 views
How do you solve for this:how many gallons of a 10% alcohol solution be mixed with 20 gallons of a 10% acid solution to obtain
1. 4 answers
2. 827 views
how do i write a procedure for making a 100mL of 0.5 M solution of sodium phosphate
1. 1 answer
2. 463 views
I have been working on these 2 problems and I think I am confusing myself. I have never tried this site before but it was
1. 2 answers
2. 1,178 views