-
A 290kg bookshelf is resting on a 10.0 kg dolly with wheels. A person pushes on the bookshelf and dolly with a force of 20.0 N to the right. What is the speed of the bookshelf in m/s after 1 second?
$10.00
Chemistry
Answered
-
What is the mass of a cube of aluminum that is 4.0 cm on each edge? The density of aluminum is 2.7 g/cm3
$10.00
Chemistry
Waiting for answer
-
Choose one type of lipid and discuss its structure (draw out an example and identify all functional groups, its properties and its biological function
$10.00
Chemistry
Waiting for answer
-
Consider the chemical equation in equilibrium. CH4(g) + H2O(g) mc004-1.jpg CO(g) + 3H2(g) What will happen to the equilibrium of this reaction if CO is added to the system?
$10.00
Chemistry
Answered
-
This is known as a beer's law plot, the expression for which is a = e*c. a is the absorbance, c is the concentration, and e* is the effective molar absorptivity which is the slope of a beer's law plot
$12.00
Chemistry
Answered
-
What type of energy is present in the batteries of a flashlight? Mechanical energy Electrical energy Chemical energy Radiant energy
$20.00
Chemistry
Answered
-
Calculate the pH for each of the following cases in the titration of 50.0mL of .130M HClO(aq) with .130M KOH(aq).
$15.00
Chemistry
Waiting for answer
-
A [ ] property is a characteristic of matter that describes its ability to change into a different substance.
$50.00
Chemistry
Answered
-
Hi, I'm having trouble with these questions; they're stoichiometry chemistry questions. I don't understand them and I'd appreciate if you were to help me! Thanks!
$10.00
Chemistry
Waiting for answer
-
Which salts will be more soluble in an acidic solution than in pure water? 1)PbSO4 2)KClO4 3)CuBr 4)BaSO3 5)Ni(OH)2 There is more than one correct answer Thanks in advance :)
$15.00
Chemistry
Answered
-
Sunflowers have specialized cells that enable the sunflower to track the Sun. Which of the following allows the sunflower to move to face the Sun? A. Gravity B. Electricity C. Fraction D. Turgor
$12.00
Chemistry
Answered
-
What is ppm? A. Concentration of a solute in mol/mol solution B. Concentration of a solute in grams/106 grams solution C. Concentration of a solute in mol/kg solvent D. Concentration of a solute in mo
$10.00
Chemistry
Answered
-
Brainliest if answered in next 10min correct answers please Describe what happens to the electrons in a neon that is heated to incandescence and then when the heat energy is removed. please help if a
$35.00
Chemistry
Waiting for answer
-
What is the solubility of marble (i.e., [ca2+] in a saturated solution) in acid rainwater, for which ph=4.20?'?
$50.00
Chemistry
Answered
-
Part aconsider these hypothetical chemical reactions:a⇌b,δg= 14.3 kj/molb⇌c,δg= -28.2 kj/molc⇌d,δg= 9.00 kj/molwhat is the free energy, δg, for the overall reaction, a⇌d?
$35.00
Chemistry
Waiting for answer
-
How much energy (in kj) is released by the combustion of 13.50 kilograms of propane in sufficient oxygen?
$10.00
Chemistry
Waiting for answer
-
A galvanic cell consists of a mg electrode in a 1.0 m mg(no3 )2 solution and a ag electrode in a 1.0 m agno3 solution. calculate the standard emf of this cell at 25°c
$50.00
Chemistry
Answered
-
Formula and structure of potassium hydrogen phthalate (KHP) used to standardize the solution of NaOH in this experiment
$35.00
Chemistry
Answered
-
1. For Part 1, describe the changes in the colors of the well, if any, as you go from well 1 to well 9—that is, as you go from the well with the least copper(II) nitrate to the well with the most co
$50.00
Chemistry
Waiting for answer
-
2SO2 + O2 = 2SO3 + heat what will happen if more surfer trioxide has is added to the reaction mixture
$50.00
Chemistry
Waiting for answer
-
A sample of vinaigrette salad dressing has a total mass of 188 g, a total volume of 196 cm3, and consists only of oil (density = 0.891 g/cm3) and vinegar (density = 1.056 g/cm3). What is the volume of
$10.00
Chemistry
Waiting for answer
-
What makes this excerpt from Oliver Twist by Charles Dickens an example of direct characterization? The elderly female was a woman of wisdom and experience; she knew what was good for children; and sh
$15.00
Chemistry
Answered
-
A sample of hydrated magnesium sulfate has a mass of 4.052 g. After it is heated, it has a mass of 1.979 g. What is the percentage by mass of water in the hydrate? Use the formula mc011-1.jpg 10.99% 2
$50.00
Chemistry
Waiting for answer
-
Lead is malleable, So it can be pounded into flash eat without breaking. How does the bonding within lead help text me in this property?
$20.00
Chemistry
Answered
-
read this article first and fill up the next page.
$10.00
Chemistry
Answered
-
What is the molar concentration of the HNO3 solution resulting from mixing 5.0mL of 3.5 M HNO3 and 95mL of 0.20 M HNO3?
$10.00
Chemistry
Waiting for answer
-
Assuming that the smallest measurable wavelength in an experiment is 0.550 fm (femtometers), what is the maximum mass of an object traveling at 297 m·s–1 for which the de Broglie wavelength is obse
$35.00
Chemistry
Answered
-
Dan wants to test the effects of different amounts of antibiotics on bacteria. While setting up his experiment, he makes sure to use the same type of antibiotic, the same type of bacteria, and the sam
$20.00
Chemistry
Answered
-
In which of the following pairs of salts will both members of the pair hydrolyze in water to give solutions that are basic? A. NaC2H3O2 and NaF B. LiCl and NaCN C. NH4Cl and NH4NO3 D. KNO3 and Li2SO4
$12.00
Chemistry
Waiting for answer
-
A chemist takes 50-gram sample of sulfur powder that has a melting point of 115.2 °C. What is the melting point of a 100-gram sample of sulfur powder?
$35.00
Chemistry
Answered
-
Desalinization plants remove the salt from sea water and make it usable for drinking and irrigation. Review the following statements and select the one that best describes how this technology has had
$12.00
Chemistry
Answered
-
A scientist in Japan and a scientist in Germany both conducted independent investigations that produced similar results. What does this mean about the data that was collected? A) The scientists will h
$10.00
Chemistry
Waiting for answer
-
___Fe + ___O2 →___Fe2O3 Your old bike left out in the rain starts to rust. What coefficients fill in the blanks to balance the equation? A) 1,2,3 B) 2,3,1 C) 2,3,2 D) 4,3,2
$20.00
Chemistry
Answered
-
A large mass of hardened igneous rock extending from beneath all layers of sedimentary rock is a: sill batholith laccolith
$15.00
Chemistry
Waiting for answer
-
A solution containing 28% acid is to be mixed with a solution containing 40% acid to make 300 gallons of a solution Containing 36% acid. how much of each solution should be used
$15.00
Chemistry
Waiting for answer
-
Heather is testing a substance as to whether it is organic or inorganic. She works with the solid substance and discovers it can conduct electricity without burning. She also knows the carbon to oxyge
$35.00
Chemistry
Answered
-
Which statement is true for a cooling curve? A.) It shows how the temperature of the substance falls as heat is removed. B.) It shows how the temperature of the substance changes when heat is applie
$15.00
Chemistry
Answered
-
What is the formula equation for the reaction between sulfuric acid and dissolved sodium hydroxide if all products and reactants are in the aqueous or liquid phase?
$35.00
Chemistry
Waiting for answer
-
How much 10.0 m hno3 must be added to 1.00 l of a buffer that is 0.0100 m acetic acid and 0.100 m sodium acetate to reduce the ph to 5.45 ?
$50.00
Chemistry
Answered
-
Ethanol has a heat of vaporization of 38.56 kj/mol and a normal boiling point of 78.4 oc. what is the vapor pressure of ethanol at 16.2 oc?
$35.00
Chemistry
Answered
-
A mixture of oxygen gas, nitrogen gas, and carbon dioxide in a 10.0 l container at 25 oc has a total pressure of 12.5 atm. if there are 30.0 g each of oxygen and nitrogen, how many grams of carbon dio
$15.00
Chemistry
Waiting for answer
-
A graduate student working toward a PhD in Chemistry discovers an efficient, powerful redox reaction involving an uncommon combination of chemicals. In order to show other chemists the voltage generat
$50.00
Chemistry
Waiting for answer
-
Based on the definition of specific heat and the information provide below, if the same amount of heat is added to 1 kg of all these substances, which substance will raise in temperature to the highes
$35.00
Chemistry
Waiting for answer
-
How many unpaired electrons are present in the ground state of an atom form each of the following groups? (a) 2A (b) 5A (c) 8A (d) 3A
$10.00
Chemistry
Waiting for answer
-
Which physical method can be used for obtaining a sample of salt from a small beaker of salt water? boiling freezing filtration sorting
$12.00
Chemistry
Answered
-
I'm stuck, I need answers. Hydrogen covalently bonds with oxygen to form the compound water. Oxygen becomes MORE chemically stable because A) Hydrogen transfers an electron from oxygen to fill it's o
$35.00
Chemistry
Answered
-
Give the complete balanced equation for the reaction that occurs when lithium carbonate (Li2CO3) is heated
$12.00
Chemistry
Answered
-
Lithium is a metal with an oxidation number of 1+ and oxygen is a nonmetal with an oxidation number of 2-. Which chemical formula represents the compound formed by these two elements? A) Li2O B) Li3O
$50.00
Chemistry
Answered
-
Which of the following is a nonrenewable energy source? A. coal B. solar C. wind D. hydropower E. burning biomass
$35.00
Chemistry
Waiting for answer
-
If you had a mixture of small glass bends and large glass beads which method could you use to seperate the two sizes of beads?
$35.00
Chemistry
Answered