Homework answers and tutorials

What we could find:
49073 results
  • Waiting for answer What is polarity?

    It is the difference in electronegativity between two atoms. Polarity arises when an electronegative and an electropositive atom bond together. For instance, an oxygen bonded to a hy...

  • Waiting for answer What is ethology?

    Ethology is the study of under natural conditions (source: Merriam-Webster ). Note that this term can also refer to the study of the formation of human character. The term ethology was first defined as the study of animals in their natural habitat by Isidore Geoffrey-Saint Hilarie in 1859 (Jaynes,...

  • Waiting for answer How does the formation of coal differ from that of natural g...

    Coal is formed by ancient plant materials while oil and gas forms from, mostly, ancient algae and other micro-organisms found in ancient seas. Coal forms on land in massive peat bo...

  • Waiting for answer Why is water potential of pure water zero?

    is the potential energy of water per unit volume relative to pure water in reference conditions. Water potential quantifies the tendency of water to move from one area to another due to , gravity, mechanical pressure, or matrix effects such as surface tension. Water potential has proved especially u...

  • Waiting for answer How do you determine whether the function ##f(x) = xe^-x## i...

    To determine concavity, analyze the sign of ##f''(x)##. ##f(x) = xe^-x## ##f'(x) = (1)e^-x + x[e^-x(-1)]## ## = e^-x-xe^-x## ## = -e^-x(x-1)## So, ##f''(x) = [-e^-x(-1)] (x-1...

  • Waiting for answer What is purging? why mostly purging with nitrogen is preffer...

    Purging is the displacement of air (Oxygen) and moisture from a by bubbling nitrogen gas into the solvent. nitrogen is preferred because it is chemically inert and it is cheap when compared with other inert gases like helium or neon. In industries, purging is important because it will prevent explo...

  • Waiting for answer How do you convert 36 cm/sec to mph?

    1cm/s = 0,022369362920544023 mph it's 0,8052970651395848 36cm/s = 0,805297 mph Using conversion tables, unit notation and cancelling numerators with denominators, thus: 36cm/s x 1...

  • Waiting for answer What are some examples of speed of sound?

    supersonic air planes are good example of sound speed, they travel 340 meters per second, and as the light they travel as wave but what differ they from each other is that light travels a million times faster. Another good example of sound speed is when you are in a thunder storm and you see a light...

  • Waiting for answer What is the value of 4 cubed?

    4 * 4 * 4 = 64 "Cubing" a number means multiplying it by itself three times.

  • Waiting for answer CuO(s)+HCl(aq) equation and net ionic equation ?

    ##"CuO"("s")## + ##"2H"^+("aq")## ##rarr## ##"Cu"^(2+)("aq")## + ##"H"_2"O"("l")## This is a reaction in which the solid copper(II) oxide base plus hydrochloric acid produce a solu...

  • Waiting for answer In a word equasion, eg Copper (II) Flouride, what does the "...

    Charge is expressed in Roman numerals. (II) this is two in roman. Copper (II) Fluoride meaning: The charge on copper is two. Why isn't the charge on fluorine expressed? Because we know all halogens are -1 in charge. We know the charge of almost all on except the transitions. The transition...

  • Waiting for answer How do you graph ##y<=x^2+8x+16##?

    Draw the parabola ##(x+4)^2 = y =0## that has the vertex at (-4, 0) and focus at (-4, 1/4). Along with, shade the region outside the curve and its enclosure for ##y =x^2+8x+16##. T...

  • Waiting for answer How can I calculate the partial pressure of a dry gas?

    Please read Dalton's law of . We must use the following equation: ##P_"dry gas" = P_"total" - P_"water vapor"## Suppose that a sample of hydrogen gas is collected over water at 14.0 °C. The pressure of the resultant mixture is 113.0 kPa. What is the pressure that is exerted by the dry hydrogen...

  • Waiting for answer In the ideal gas equation, which term is always constant?

    ##R## is always constant. The equation is ##PV = nRT## where: ##P## is the pressure of the gas ##V## is the volume of the gas ##n## is of the gas ##R## is the gas constant ##T## is...

  • Waiting for answer How far is Jupiter from the moon in miles?

    483.3 million miles, nearly The average distance of Jupiter from is 778.6 million km = 483.3 million miles. Aphelion is maximum distance of a planet from the Sun. Perihelion is th...

  • Waiting for answer How was Japanese feudalism similar to European feudalism?

    One major one is that they were born into their class. In Feudal Europe, you are born into your class, such as a lord or peasant. In Japanese feudalism, you are born into your class,...

  • Waiting for answer How are absolute temperature and volume of a gas related?

    The volume of a gas is directly proportional to its absolute temperature. More specifically, for a fixed mass of gas at a constant pressure, the volume (V) is directly proportional to the absolute temperature (T). This is Charles’ Law. V ∝ T V = kT, where k is a proportionality constant. ##V/T##...

  • Waiting for answer How did the invention of the cotton gin in 1793 affect the u...

    A rapid rise in the number of slaves in America. Cotton production was very labor intensive. A bottle neck in the production was removing in seeds from the cotton. The cotton gin (s...

  • Waiting for answer How far is the moon in miles from earth?

    According to NASA, the moon is at an average of 238,855 miles distant from earth. The moon goes around in an elliptical orbit, so it's not always at the same distance away from Eart...

  • Waiting for answer What does the cytoplasm do in a plant cell?

    Cytoplasm in a plant cell serves the same purposes that it does in any other type of cell. These are: -To give the cell form -To house the cell's other organelles -And sometimes to hold certain chemicals needed by the cell. Did you mean something that it only does in a plant cell? I can't think of...

Show on page

Learn more effectively and get better grades!

Do my homework