krystal

This page lists questions and answers that were posted by visitors named krystal.

Questions

The following questions were asked by visitors named krystal.

Gold, has a mass of 19.32g for wach cubic centimeter of volume, is most ductile metal and can be pressed into a thin leaf or drawn out into long fiber. -If a sample of gold, with a mass of 27.63g is pressed into a leaf of 1.000micometers thickness, what i...

X+3 over t =t squared

a plateau beneath the ocean from which the continents rise is called?

square root of -45? (using imaginary numbers)

can a function have more than one y intercept.?

write an equation of the line that passes through the given points: 1.(-1,0),(0,-2)

I've worked these problems but I was just wondering if someone could check over them to see if they're correct...if not please help! (u-2)(u+7) my answer: 7u^2-49u (5t-4)^2 my answer: 25t^2-40+16 Thank you :)

you drive 132 km/h for a half hour and then drive 60 km/h for an hour and a half. what is the average speed? (give units)

how do i write a procedure for making a 100mL of 0.5 M solution of sodium phosphate

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 an 8% acid solution.

List the characters in the story. Write one to two sentences on the defining characteristics of each one, providing at least one citation to illustrate your comments. Why do you think the story is called "A Very Old Man with Enormous Wings" rather than "A...

how long does it take a softball to cross homeplate at 43 feet if the ball is going 65 miles per hour?

i am doing decimals and its estumating decimal prouducts can you help this is the question: 6.3 x 17.59

I need to find a climatogram of Puerto Rico for my project. I've gone on several different sites for puerto rico and several environmental sites but have not been able to find a climatogram for puerto rico's tropical rainforest, does anyone know of a site...

True/false and if false change the word in ( ) The process of handing out jobs to one's supporters is known as the (citizen system) During the american revolution, the (hessians) remained loyal to england.

True / False If 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 i answered right or wrong....plz help In (salutary neglect) a nation colonizes to create wealth for itself and to create mark...

What was the Johnson Administration's policy on civil rights? state an example

Describe a major result of the civil war and assess whether it was good or bad for the country....i choose slavery ending but need help starting my paper....i have to write at least 3 paragraphs

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 The Reconstruction Period refers to efforts made in the US between 1865 and 1877 to restructure the political, legal and econo...

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 should be withdrawn from the ampoule if 20 mg are to be administered to a patient?Answer with the correct number of sig figs

Write the formula of the ionic compound that forms between a. copper(I) ions and chloride ions---CuCl b. copper(II) ions and hydrogen sulfate ions--Cu(HSO4)2 c. lithium ions and iodide ions--LiI d. cobalt(III) ions and phosphate ions---CoPO4

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

Name each binary molecule. a. CS2 Carbon Disulfide b. N2O3 Dinitrogen trioxide c. NF3 Nitrogen trifluoride

Predict the number of covalent bonds formed by each nonmetal atom. a. N-----3 bonds b. Cl-----1 bond c. S-----2 bonds

Name each of the following ionic compounds or binary molecules. a. SF2---Sulfur difluoride b. MgF2---Magnesium fluoride c. SnCl2----Tin (II) Chloride d. PF5-----Phosphorus Pentafluoride e. NO2-----Nitrogen Dioxide f. SnO2-----Tin (II) Oxide

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 CO32- ions are present in 102 g of Li2CO3? Dont get how to compute

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

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

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 many moles of aspirin are present in 100 mg of aspirin? Enter your answer in scientific notation. 5E-4 mol aspirin d. How many m...

a. Cl2 + 2NaI → 2NaCl + I2 This is a single replacement reaction. b. 2K + 2HCl → 2KCl + H2 This is a single replacement reaction. c. N2 + 3H2 → 2NH3 This is a synthesis reaction. d. 2KClO3 → 2KCl + 3O2 This is a decompisition reaction

Magnesium reacts with iron(II) chloride according to the equation Mg(s) + FeCl2(aq) → MgCl2(aq) + Fe(s) a. Is magnesium oxidized or is it reduced? Magnesium is reduced. b. Is iron(II) ion oxidized or is it reduced? Iron(II) ion is oxidized . c. What is th...

is cappuccino masculine or feminine is giorno masculine or feminine

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 many moles of O2 are required to completely consume the N2? b. how many moles of NO are obtained when the N2 is completely rea...

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 are required to completely consume the CH3CH3? 9.1 moles b. how many moles of CO2 are obtained when the CH3CH3 is completely co...

Consider the following reaction. 2KClO3(s) → 2KCl(s) + 3O2(g) a. How many grams of KCl are produced from the complete reaction of 2.16 mol of KClO3? 161g b. How many grams of KCl are produced from the complete reaction of 52.7 g of KClO3? 32.1 g

How many moles of aspirin are present in 100 mg of aspirin? Enter your answer in scientific notation. 5.5E-4

Aluminum metal reacts with oxygen gas (O2) to form aluminum oxide. a. Write a balanced equation for this oxidation-reduction reaction. (In this problem you need not worry about the physical state of the reactants or product.) 2Al+3O2=2Al2O3 b. which react...

1-Butene (CH2=CHCH2CH3) burns in the presence of O2 to produce CO2 and H2O. Write the balanced chemical equation for this reaction (omit physical states and use condensed molecular formulas). CH2CHCH2CH3+6O2=4CO2+4H2O

Consider the following reaction. 4Fe + 3O2=2Fe2O3 a. How many moles of O2 are required to react completely with 29.8 mg of Fe? 4.00 x 10^-4 moles O2 b. How many grams Fe2O3, are produced from the complete reaction of 17.8 g of Fe? 25.4 g Fe2O3

Mercury reacts with oxygen to produce mercury(II) oxide. Hg(l) + O2(g) → HgO(s) a. Balance the reaction equation. Include physical states. 2Hg(l) + O2(g) → 2HgO(s) b. What is the theoretical yield (in grams) of HgO if 255 g of Hg are reacted with 255 g of...

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 with 36.4 g of O2? O2 b. What is the theoretical yield of Al2O3, in grams? 68.8 g c. If 22.2 g of Al2O3 are obtained, what is t...

What mass of potassium chloride, a salt substitute often used by heart patients, can be produced directly from 5.2 g potassium and 7.9 g chlorine? 9.9 g

If hydrated sodium carbonate contains 6.0 g of carbon, find its mass.

a. Listening to the weather report, you hear that the barometer is falling. What part of the barometer is falling? The level of mercury is falling. b. What is happening to the air pressure? The air pressure is decreasing.

A bottle of 80 proof alcohol is 40% ethanol and 60% water. What is the solvent in this solution? water

At which temperature is NaCl more soluble in water, 0°C or 90°C? 0°C 90°C

A pan full of hot salt water, NaCl(aq), is cooled and NaCl(s) precipitates. Explain why this happens. Chloride ions are more strongly attracted to the metal in the pan than the sodium ions at low temperatures. As the vapor pressure of the solution decreas...

What happens to the solubility of oxygen gas (O2) in water in each situation? a. The pressure of O2 over the solution is decreased. solubility decreases solubility remains the same solubility increases b. The temperature is decreased. solubility remains t...

Explain why an opened bottle of carbonated water keeps its fizz longer if kept in a refrigerator than if kept at room temperature. a. As time elapses the concentration of CO2 inside a closed refrigerator increases. The increased partial pressure of CO2 in...

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

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 90 M NaCl

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 100 M CaCl2 b. weight/volume percent 0.1 % (w/v) c. parts per thousand 100 ppt d. parts per million 10E4 ppm e. parts per billio...

How many milliliters of 0.729 M NaOH are needed to prepare 150.0 mL of 0.122 M NaOH? 25.1 mL

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 mL of water? 0.284 M

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

Explain how you would prepare a saturated aqueous solution of table sugar. Heat the solution to near its boiling point. With stirring, add table sugar to water. Keep adding sugar until no more dissolves. Allow the solution to cool. With stirring, add tabl...

Give the formula for the conjugate base of each acid. a. HSO4- H2SO4- b. H3PO4 H4PO4 c. HPO42- H2PO42- d. HNO3 H2NO3

Water is amphoteric (can act as an acid or a base). a. Complete the chemical equation that shows water acting as a base. H2O + HCl ⇋ Cl- + H3O+ b. In this reaction, what is the conjugate acid of water? H3O+

Which is the conjugate base of the bicarbonate ion, HCO3-? CO3 2-

In the reaction below: Increasing the concentration of Cl2 will _____ at equilibrium. HAVE NO EFFECT

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 10-13 M This solution is basic. c. [H3O+] = 3.2 x 10-1 M This solution is acidic.

alculate the H3O+ concentration present in water under the following conditions. Enter your answer in scientific notation. a. [OH-] = 8.9 x 10-5 M 1.1E-10 b. [OH-] = 3.8 x 10-3 M 2.6E-12 c. [OH-] = 4.8 x 10-12 M 2.1E-3

What is reduced and what is oxidized in the reaction? 2Mg+O2=2MgO Oxygen is oxidized Mg is reduced

In this equation is Fe(OH)3 and NaCL a solid liquid gas or aqueous? FeCl3 (aq) + 3NaOH(aq)=Fe(OH)3+NaCl

CH4 + 2 O2 = CO2 + H2O Carbon is being oxidized Oxygen is being reduced

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 10-13 M This solution is basic. c. [H3O+] = 3.2 x 10-1 M This solution is acidic.

Calculate the pH of a 0.0019 M HNO3 solution.

As the pH of a system decreases: the [H+] decreases the Kw decreases the [OH-] decreases all of the above

Indicate the number of covalent bonds that each nonmetal atom is expected to form. a. Se is expected to form 2 covalent bonds. b. H is expected to form 1 covalent bonds. c. Br is expected to form 1 covalent bonds. d. N is expected to form 3 covalent bonds...

Do hydrogen bonds form between methanol (CH3OH) molecules?

Which of the molecules can form a hydrogen bond with a water molecule? 1. CH3OH 2. CH2=CHCH3 3. CH3CH2SH 4. CH3OCH3

Which has the higher boiling point? (a) CH3CH2CH2CH2CH3 or (b) CH3CH2CH2CH2CH2CH2CH2CH3

do hydrogen bonds form between methanol (CH3OH) molecules? no, because methanol does not contain fluorine or nitrogen atoms yes, because methanol has a hydrogen attached to an oxygen atom may vary depending on the temperature

Choose the type of shape that best matches to CH4. Linear Trigonal planar Bent Tetrahedral Pyramidal

The kinds of interactions that exist between CH3COOH molecules include dipole-dipole (including hydrogen bonding) interactions and London forces.True or False Its false there are no hydrogen bonds?

Calculate the amount of interest earned in 10 years on $1000 invested at 3.00% per annum, compunded annually?

Benedict's reagent is used for detecting reducing sugars because _________. the —OH groups are exchanged for hydrogens. the copper ion in the reagent is oxidized as the sugar is reduced. the aldehyde group in the sugar is oxidized. a reduction of the suga...

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 enzyme may lose its native conformation and lose its ability to function as a catalyst. B. When the pH changes, enzymes are surr...

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 height of the building

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 the gravitational force between Royce and earth at age 16 compared to age 10

How many moles of hno3 neede to prepare 7.5 l of a 5.6m solution

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 important to my future. A high school diploma is important to my future for a number of reasons. The First being to attend college...

list three environmental challenges facing the acient people of mesopotamia.

what are city states?

Value ways 2 3/5 miles each day.Bill runs 10 miles once every 4 days. In 4 days, who covers the greater distance?

need to make a silent proof box 15,000 cubic centimeters. What is the dimensions? I am having a hard time figuring it out.

what is 136 in exspanded form

Answers

The following answers were posted by visitors named krystal.

porka esta siendo mija de buehos

can you help with the 2nd question? I have stressed myself over this and I am frustrated. I appreciate you help so much

how many gallons of a 10% alcohol solution be mixed with 20 gallons of a 10% acid solution to obtain an 8% acid solution? This is college algebra not chemistry

The answer is 40/3 I just need to know how to solve it.

the figure was talland gaunt and shrouded from heard to foot in the habiliments of the grave. what does the word habiliments is used for in the sentece?

thanks, i had one true and one false but i had them reversed. i am using this to study for my final and i really need a good grade.

The only differences are a treaty requires a 2/3 vote from Senate, Executive Agreement can be done by the President alone, and A Treaty is something eveyone knows about and can last forever, an Executive Agreement doesnt have to be made known and may only...

they were forced out of their homes, put into camps, and accused of being disloyal to the american government

Johnson quickly declared that the war goals of national unity and the ending of slavery had been achieved, so that reconstruction was complete. Congress did not agree with this. Radical Republicans became incensed when Johnson issued a general pardon for...

Alhough Congress passed and the states ratified the Fifteenth Amendment in 1870, it had very little impact in the South. The amendment prohibited voting discrimination based on race, but blacks were intimidated by the KKK and local employers and stayed aw...

ok, thanks that was my rough draft. I did mean to explain the force acts but will def go back and add an explanation.

Is ammonium bromide correct?

so the answer would be O and Cl

so the answer would be 1.38 moles

So the answers would be a. 0.067 b. 0.134

or should it be rounded to 5.6?

4Al+3O2=2Al2O3 O2 is being oxidized Al is being reduced Al is the oxidizing agent O2 is the reducing agent

is the answer Chloride ions are more strongly attracted to the metal in the pan than the sodium ions at low temperatures?

is b solubility increases

is a. solubility decreases

so d would be the correct answer

then is this the correct answer As the temperature decreases the solubility of the salt goes down and the salt in excess settles out as a precipitate.

nevermind b should be solubilty decreases right

This is the equation PCl3 + Cl2 = PCl5

a. SO4^2- b. H2PO4 c. PO4^2- d. NO3^-

so the answer would be OH- decreases

Tonya took out a loan to help pay for her house. She borrowed $60,000 for 15 years at a yearly simple interest rate of 5%. How much interest will she end up paying the bank?

Its just a to be a 8 sentence paragraph that fully develops the topic (a high school diploma is important to my future.) I need it proof read for mistakes and need to know if it fully develops that topic.

I did post the other question under the name Charlie though because I don't like to use my name as much.

Well its actually her computer.

independent variables

i think it is 8

there are 70% dextrose solution, how many grams are in 8.75 mL solution?

nope can't help here sorry

whats the anwser

I think its line 15

which of the following numbers is less than -5

Use the Counting Principle to find the probability of rolling a 4 on each of 4 number cubes.