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Chemistry
Chemistry
High School
A 1M solution of NaCl (aq) is represented in the particle diagram. Which of the following diagrams best represents a 1M solution of CaCl2 (aq), assuming that the volumes of the solutions represented are equal?
Chemistry
College
Which one is the answer
Chemistry
College
hot lump of 26.5 g of copper at an initial temperature of 77.0 C is placed in 50.0 mL HO initially at 25.0 C and allowed toeach thermal equilibrium. What is the final temperature of the copper and water, given that the specific heat of copper is0.385 J/(g-C)? Assume no heat is lost to surroundings.Tfinal= Can someone please help asap!
Chemistry
High School
an aqueous methanol, ch3oh, solution has a mole fraction of 0.548 of methanol. what is the mass percentage of water in this solution?
Chemistry
High School
if the nuclide has a half-life of 8.0 days , what mass of the nuclide remains in the patient at 8:00 p.m. the next day? (assume no excretion of the nuclide from the body.)
Chemistry
High School
assign oxidation numbers to each of the atoms br and o in bro3.
Chemistry
High School
what is the molarity of a kcl solution made by diluting 75.0 ml of a 0.200 m solution to a final volume of 100.ml?
Chemistry
High School
a 0.150 mol sample of an ideal gas occupies 3.50l. what is the volume of 0.250 moles of this gas at the same temperature and pressure?
Chemistry
High School
how many grams of sulfur are involved in this reaction if 95 grams of iron are needed to react with sulfur?
Chemistry
High School
Which state of matter is characterized by having molecules close together, but moving randomly? A) gas B) liquid C) solid D) all of these
Chemistry
High School
Balance the following reaction, which occurs in basic solution.MnO4-(aq) + Br-(aq) --> MnO2(s) + BrO3-(aq)Please show your work.
Chemistry
High School
49. the half life of c0-60 is 5.2 years. how many mg of a 1000 mg sample will remain after 9.50 years? g
Chemistry
High School
The main component of s a product that is formed through the following series of intermediate chemical reactions.mc003-What is the overall chemical equation for smog after the above intermediate reactions are combined?Upper N subscript 2 (g) plus 3 upper O subscript 2 (g) plus 2 upper O subscript 3 (g) plus 2 upper O (g) right arrow 8 upper N upper O (g) plus 4 upper N upper 0 subscript 2 (g) plus 2 upper O subscript 3 (g).Upper N subscript 2 (g) plus 3 upper O subscript 2 (g) plus upper O subscript 3 (g) plus upper O (g) right arrow 9 upper N upper O (g) plus 3 upper N upper 0 subscript 2 (g) plus 2 upper O subscript 3 (g).Upper N subscript 2 (g) plus 3 upper O subscript 2 (g) right arrow 3 upper N upper O subscript 2 (g).Upper N subscript 2 (g) plus 2 upper O subscript 2 (g) right arrow 2 upper N upper O subscript 2 (g).
Chemistry
High School
Gases generally haveA)low densityB) high densityC) closely packed particlesD) no increase in volume when temperature is increasedE) no decrease in volume when pressure is increased
Chemistry
High School
Calculate the ratio of the effusion rates of N2 and N2O.A)0.637B)1.57C)1.25D)0.798E)1.61
Chemistry
High School
Which of the following reactions would you predict to have the largest orientation factor?H(g) + F(g) HF(g)NH3(g) + BCl3(g) H3N-BCl3(g)NOCl(g) + NOCl(g) 2NO(g) + Cl2(g)Br2(g) + H2C=CH2(g) H2BrC-CBrH2(g)All of these reactions should have nearly identical orientation factors.
Chemistry
High School
For a gas, which two variables are directly proportional to each other (if all other conditions remain constant)?1. T and n2. V and n3. V and TA)1 onlyB)2 onlyC)3 onlyD)1 and 2 onlyE)2 and 3 only
Chemistry
High School
why can't grignard/organolithium compounds cannot be formed in the presence of o-h, n-h, s-h bonds or terminal alkyne
Chemistry
College
7. Propane reacts with oxygen to producethe equation pictured below.Which of the following statements is correct?Cz Hq + 50- 50 300 + 4HO2O For every 4 moles of water produced, 3 moles of propane react.O For each mole of oxygen that reacts, 3 moles of carbon dioxide are produced.For every 3 moles of carbon dioxide produced, 5 moles of oxygen react.O For each mole of propane that reacts, 5 moles of oxygen are produced.
Chemistry
High School
What are the safety hazards associated with glacial acetic acid? 1. Carcinogen 2. Health Hazard 3. Environmental hazard 4. Flammable 5. Corrosive
Chemistry
High School
Which of the following phenomena is most likely due to the high specific heat capacity of water?a. A lizard, called the "Jesus lizard," can run across the surface of liquid water for short distances.b. Lakes and rivers freeze from the top, not the bottom.c. Adding salt to snow makes it melt.d. The temperature of the Santa Monica Bay, off the coast of Los Angeles, fluctuates less than the air temperature throughout the year.e. All of the above are due to the high specific heat capacity of water.
Chemistry
College
one is not tru regarding to electrons and its energy absorbers or emits ? A.the radius of an atoms are directly proporshin with electrons energy.B.as waveleng of emited increase energy also increase.C.as enery decrease wave lengths are decrease. D. as frequency increase the energy also increase.
Chemistry
High School
in which beaker - a, b, or c - would you expect the iron to show the most corrosion?
Chemistry
High School
A sample of radioactive material has a half-life of 10 days. If 160 grams of the material remain after 20 days, what was the starting mass of the sample?
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