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Cortney

Questions (60)

A recipe calls for 2/3 cup of sugar for every 2 teaspoons of vanilla. What is the unit rate in cups per teaspoon?
1. 3 answers
2. 305 views
A pond is 36 m long. A duck swims 4 length of the pond each day. How far does the duck swim in 4 weeks
1. 10 answers
2. 4,282 views
A man exerts an effort of 250 Newtons through a distance of 4 meters to lift a load of 1000 Newtons through a height of 0.75
1. 1 answer
2. 516 views
If the ratio of the rise to run on the pitch of a roof is 7/10 and the run is 30 feet, what is the rise?
1. 1 answer
2. 509 views
how to make a buffer with 25 drops of 1.0 M acetic acid and 10 to 25 drops of sodium acetate
1. 1 answer
2. 448 views
A chemist needs to prepare a buffer solution of pH 8.80. What molarity of NH3 (pKb = 4.75) is required to produce the buffer
1. 4 answers
2. 1,882 views
Suppose you add 2.0 mL of 0.10 M HCl to 100 ml of buffer having 0.10 M HA and 0.20 M NaA.a. Which species will react strongly
1. 5 answers
2. 2,149 views
A solution is prepared by titrating a 100.0 mL sample of 0.10 M HF (Ka = 7.2 × 10-4) with 0.10 M NaOH.What is the pH after 20.0
1. 1 answer
2. 460 views
why does the neutrality in the blood depends on the concentrations of [H+] and [OH-] rather than pH.
1. 1 answer
2. 386 views
Is C2O4H- more likely to act as an acid or base
1. 3 answers
2. 1,051 views
If you had left your copper(II) nitrate/potassium hydroxide precipitate stand for a while, the precipitate would turn into a
1. 4 answers
2. 2,726 views
Two atoms with charges of +1 and -1 are separated by a distance of 0.5 angstroms. What would happen to the lattice energy
1. 5 answers
2. 2,444 views
For the weak hypochlorous acid (HClO), which statement is true at the point halfway to the equivalence point?A. The total amount
1. 7 answers
2. 1,942 views
Find an article in an online Spanish language newspaper that interests you. Find another article in an online newspaper near
1. 5 answers
2. 2,652 views
What must be true for a substance to dissolve in water?A. The entropy term must be positive. B. The enthalpy and entropy terms
1. 6 answers
2. 2,904 views
An aqueous solution of 0.25 M silver nitrate, AgNO3, and 0.25 M iron(II) nitrate, Fe(NO3)2, are allowed to come to equilibrium
1. 5 answers
2. 2,429 views
What intermolecular forces are responsible for neoprene's stretchiness?
1. 2 answers
2. 546 views
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected?A. The engine will get
1. 3 answers
2. 743 views
If it takes 30 seconds for a reactant concentration to decrease from 1.0 M to 0.5 M in a first-order chemical reaction, then
1. 4 answers
2. 1,436 views
How can the overall order of a reaction be determined?A. Add the exponents in an equilibrium constant expression. B. Add the
1. 4 answers
2. 1,518 views
A student tested the effect of temperature on the decomposition of N2O5. He found that the rate of the reaction at a lower
1. 4 answers
2. 2,560 views
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected?A. The engine will get
1. 2 answers
2. 724 views
What volume of nitrogen gas at STP can form from 1.20 mol NaN3?2NaN3(s) 2Na(s) + 3N2(g) A. 40.3 L B. 1.20 L C. 13.4 L D. 1.80 L
1. 7 answers
2. 3,267 views
How many moles of gas will occupy 6.75 m3 at 65.0°C and 3.28 x 105 Pa?A. 7.98 x 104 mol B. 4.10 x 103 mol C. 7.88 x 102 mol D.
1. 6 answers
2. 2,712 views
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected?A. The engine will get
1. 5 answers
2. 2,789 views
The molecules of which gas have the greatest velocity at 120°C?A. O2 B. CO2 C. NH3 D. Cl2
1. 5 answers
2. 2,641 views
Which of the following is not a physical property of gases?A. Low density B. No thermal expansion C. No fixed shape D.
1. 4 answers
2. 2,723 views
What are the parameters of a sample of gas that are all interrelated and affect each other when any one of them changes?A.
1. 7 answers
2. 2,265 views
Which properties of a gas increase linearly as the temperature is increased?A. Volume and density B. Volume and pressure C.
1. 12 answers
2. 1,144 views
A spark plug fires before the gases in a cylinder are fully compressed. How will the engine be affected?A. The engine will get
1. 3 answers
2. 870 views
During which stroke of a four-stroke internal combustion engine is work done to the system of gases?A. Exhaust stroke B. Intake
1. 5 answers
2. 2,143 views
Gases can be differentiated from solids and liquids because gases have:A. reduced chemical reactivity. B. no color. C. average
1. 5 answers
2. 2,035 views
Which properties of a gas increase linearly as the temperature is increased?A. Volume and density B. Volume and pressure C.
1. 5 answers
2. 2,121 views
Which of the following best applies to the pressure of a gas?A. It is the force per unit volume. B. It decreases with
1. 5 answers
2. 2,459 views
After being heated, an enzyme loses its ability to catalyze a reaction. What change occurred to the enzyme?A. A physical change,
1. 4 answers
2. 2,892 views
Which argument supports the claim that dissolving solid calcium chloride (CaCl2) in water is a chemical change?A. The ionic bond
1. 4 answers
2. 2,558 views
As an ionic solid dissolves in water, the temperature of the solution increases. What best describes the enthalpy and entropy of
1. 4 answers
2. 3,877 views
What is the strongest intermolecular force that occurs between methane (CH4) and ammonia (NH3)?A. Dipole-induced dipole
1. 2 answers
2. 1,382 views
A. The molecules of water on the surface change bonding as they dry out.B. The density of the pin is less than that of the
1. 3 answers
2. 890 views
Why is it possible to float a pin on the surface of water?A. The molecules of water on the surface change bonding as they dry
1. 4 answers
2. 2,173 views
As an ionic solid dissolves in water, the temperature of the solution increases. What best describes the enthalpy and entropy of
1. 1 answer
2. 823 views
______________ are similar to covalent bonds in that they hold atoms together. They are different from covalent bonds in that
1. 5 answers
2. 2,569 views
How do intermolecular forces determine the vapor pressure of a liquid?A. A nonpolar compound has a low vapor pressure because of
1. 3 answers
2. 872 views
Which of the following statements is (or are) true?I. All polar molecules have dipole moments. II. All polar molecules have
1. 4 answers
2. 2,963 views
1. What is the cause of a gas sample exerting pressure on its surroundings, such as a container?A. The sum of the volumes of all
1. 4 answers
2. 2,476 views
1. Ideal gas particles:A. have no mutual attraction and no individual volume. B. have no mass or volume. C. have no odor and no
1. 3 answers
2. 1,865 views
How does table salt (NaCl) dissolve in water?A. The oxygen atoms in water molecules attract sodium ions. B. Each sodium ion is
1. 5 answers
2. 3,334 views
To dissolve an ionic solid in water, you must first disrupt the ionic bonds that are holding the ionic lattice together. This is
1. 4 answers
2. 2,372 views
Liquid methyl alcohol, which has polar molecules, will dissolve:A. only solutes that are other polar liquids. B. only solutes
1. 3 answers
2. 2,536 views
Which step during the dissolving process releases energy?A. Separating solute particles from one another B. Adding solute into
1. 4 answers
2. 3,440 views
Olive oil has a higher viscosity than benzene. Which statement best explains the reason for the difference in viscosity between
1. 4 answers
2. 2,204 views
I just want to make sure that D is the correct answer.Each halogen is a diatomic element. However, under normal conditions
1. 4 answers
2. 2,556 views
I believe the answer is c I just wanted to make sure.What can help overcome a positive enthalpy of solution and allow a solid
1. 5 answers
2. 2,180 views
Determine the mass of Co(NO3)2•6 H2O to prepare 250 mL of a 0.50 M stock solution.
1. 2 answers
2. 702 views
In a math class there are 28 students. Each student has a 90% chance of attending any given class and students act
1. 2 answers
2. 1,095 views
write a function. f(x), that represents the cost of renting a car for x days with a total of 80 kilometers if there is a fixed
1. 1 answer
2. 448 views
Janice is running a 7613 meter race. Assume the she runs at a constant speed of 287 meters per minute. Express the function f(t)
1. 1 answer
2. 755 views
Janice is running a 7613 meter race. Assume the she runs at a constant speed of 287 meters per minute. Express the function f(t)
1. 3 answers
2. 1,039 views
write a function. f(x), that represents the cost of renting a car for x days with a total of 80 kilometers if there is a fixed
1. 2 answers
2. 702 views
I need someone to correct my translations... Can you please help :(... at least some, here they are:1.
1. 1 answer
2. 356 views

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