# Science Homework Help

eNotes Homework Help is a way for educators to help students understand their school work. Our experts are here to answer your toughest academic questions! Once it’s posted to our site, your question could help thousands of other students.

• Science
There are several almost identical definitions of 1atm. Because you mentioned mercury, I suggest to use the definition "1 atm = the pressure of the mercury column with the height of 760 mm". As you...

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• Science
A similar question has recently been answered (http://www.enotes.com/homework-help/association-arsenic-exposure-during-pregnancy-with-513583). The previous question dealt with the presence of any...

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Sonic is anything related to sound or speed of sound. For examples, any object moving with speeds greater than the speed of sound (in air, equal to 343 m/s or 768 miles per hour or 1 Mach) are...

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• Science
Force is given as a product of mass and acceleration and is given by Newton's second law of motion as: F = m x a where, F is the force, m is the mass and a is the acceleration. In this case, mass...

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• Science
80 gm ice cube at 0 degree C and 800 gm water at 24 degree C. We can start by understanding the basic processes that will take place. Heat flows from hot body to cold body. So, heat will flow from...

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• Science
First calculate the odds ratio from the 2x2 contingency table HIV+ ___Y____N___ |____ Exposure Y | 60 25 |...

• Science
Hypothesis is a possible explanation for an observation. In this case the observation is that the dog is shedding, a hypothesis will present a possible explanation for this. Let us evaluate each of...

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Big Bang theory represents the most important theory in astronomy, which explains the beginning of the universe. This theory states that the expansion of the ball of compacted matter, having...

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• Science
For a zinc-magnesium electrochemical cell, the half cell potentials from the standard table are: `Mg^(2+) + 2e^- -> Mg, E = -2.38 V` `Zn^(2+) + 2e^- -> Zn, E = -0.76 V` From the standard...

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• Science
The Boreal Forest has two other common names: the snow forest, and, taiga. These three terms can be used interchangeably, but Boreal or taiga are more often used in formal/academic contexts....

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• Science
In voltaic cells, also called galvanic cells, oxidation occurs at the anode and reduction occurs at the cathode. A mnemonic for this is "An Ox. Red Cat." So since silver is oxidized, the silver...

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• Science
In general, rate of reaction increases with an increase in temperature (so you may have to change your hypothesis). This is defined by the famous Arrhenius equation: `k = Ae^[(-E_a)/(RT)]` where,...

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• Science
The force exerted on the wall will depend on the change of momentum of either ball or plasticine. The change of momentum is related to the force as `Delta vecP = vecF* Delta t` The force in this...

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A social scientist, also known as sociologist, may ask many different questions about society. The questions mainly focus on social behavior. Sociology is the scientific study of social behavior,...

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Aluminum foil is produced as a thin sheet of rolled and pressed aluminum generally .0043mm to .15mm. The biggest use of aluminum foil is as a packaging material, especially for food items. It is...

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• Science
You need to remember what a solute, a solvent and a solution represent. A solvent in a solution represents the substance that performs the dissolving process, while the solute represents the...

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• Science
Force represents the rate of change of momentum. Force depends on the mass and acceleration of the object whose position is changed by the effect of force. The equation that describes the relation...

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• Science
The study of Rahman et al., evaluated the effect of arsenic exposure, through consumption of contaminated tube well water, on infant death and fetal loss in Matlab, Bangladesh. The authors report a...

• Science
Cost of 1 can = \$2.99 Amount of drink mix in a can = 50.2 gm Cost of drink mix per gram = \$2.99/50.2 gm = 59.6 cents/gm. One lb = 454 gm Cost of 454 gm drink mix = 454 gm x 59.6 cents/gm =...

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• Science
A substance with a density of 0.77 gm/cm^3 will float in Water. The reason for this, In simplest terms, is that the substance is lighter than water. Water has a density of about 1 gm/cm^3 and hence...

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• Science
The study by Rahman et al., investigated the effect of consumption of arsenic contaminated tube well water on infant death and fetal loss in Bangladesh. The exposure was measured in terms of...

• Science
Water mold includes the taxonomic class of protists, which are eukaryotes, including algae, amoeba, ciliates or flagellates. Protists tasonomic class consists of unicellular and multicellular...

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Prevention or treatment of high blood pressure includes treatment and control of factors that could influence it, such as diet, stress level and daily exercises. There exists many herbal treatments...

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Salamanders are long and slender. So they look similar to a lizard, which are reptiles. However, salamanders are most closely related to amphibious newt. The main difference between a reptile and...

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If you wonder why the metals found in Group II, in peridic tables, are called alkaline, the response is linked to the fact that they have the property to form solutions having higher pH levels....

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Iron and sulfur are two different elements. A mixture of iron and sulfur has separate particles that are atoms of the two elements. It is quite easy to separate the two when they are present in a...

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• Science
Organisms that make their own food are called producers (because they PRODUCE, or make, their own food). Other names for producers are autotrophs (auto = self, so they feed themselves). Producers...

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• Science
A body is said to be at absolute zero if its temperature is 0K or -273.15 C. At temperature T a body emits electromagnetic radiation at a rate `P = sigma*T^4` where P is the power per unit area, T...

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A nonrenewable resource is one that is not easily replaced in comparison to its level of consumption. Examples of nonrenewable resources are most fossil fuels such as oil, petroleum, or natural...

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The speed of chemical reactions, such as photosynthesis, cellular respiration and creation of new proteins, is increased by means of biological catalysts, represented by enzymes, which are soluble...

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Ribosomes, along with RNA (m, t, and r), work to produce proteins. If ribosomes are located on the endoplasmic reticulum, then it is called a rough endoplasmic reticulum (due to the "bumpy"...

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Kinetic energy is the energy of an object due to its motion, while the potential energy is the energy due to its position. The various forms of potential and kinetic energy are: Gravitational...

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Liver is the largest gland in human body. It is also the largest (internal) organ in our body and can weigh up to 1.5-1.6 kg for a human adult. That is, about 1/50th of the body weight is because...

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• Science
There can be a number of chemical processes by which a compounds can be broken down into simpler substances. The most common and wide-spread of such processes is Catabolism. Along with anabolism,...

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• Science
The temperature of objects is measured in degree Celsius by first assigning a temperature that has a value 0 C. A temperature lower than 0 C is expressed as a negative number and a temperature...

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• Science
Neutral atoms that gain or lose an electron are classified as anions or cations. Cations are neutral atoms that lose an electron, becoming positively charged. Ionization represents the process by...

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There exists different forms of energy, such as electrical energy, chemical energy, mechanical energy, nuclear energy, gravitational energy. These forms of energies can be converted between one...

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Benedict's reagent is a solution that has sodium citrate, sodium carbonate and cupric sulphate pentahydrate. It is used to test for the presence of reducing sugars. These include monosaccharides...

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A substance can physically exists in one of three states, solid, liquid and gas. (A fourth state plasma that can be observed is not relevant to this answer) The temperature of a substance and the...

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• Science
For an ideal gas, the temperature(T), volume(V) and pressure(P) are related by the ideal gas law PV = n*R*T where n is the amount of substance in moles and R is the gas constant. If pressure and...

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Alcohols are available naturally as well as prepared by man-made engineered systems. Alcohols are organic compounds with a hydroxyl group and are of various types. The most common forms of alcohol...

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All elements are found as particles called atoms, composed to protons, neutrons and electrons, the exception being hydrogen which does not have neutrons. The protons and neutrons form the nucleus...

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Ethanol is a chemical compound made up of carbon, hydrogen and oxygen atoms. The chemical formula of ethanol is `CH_3CH_2OH` . When ethanol is burnt, it reacts with oxygen and produces water and...

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• Science
Fish belongs to the vertebrate group, consisting of 5 types of vertebrates, such as birds, mammals, rodents, marsupials, primates, fish, amphibians, reptiles. Fish were among the first developed...

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ATP unstable molecules are the main source of energy for cells. ATP molecules are produced by the energy generated by catabolic reactions, and ATP energy is used in anabolic reactions. ATP is...

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• Science
The elements are arranged in the form of a table, known as periodic table. There are 18 columns (known as groups) and 7 rows (known as periods, including actinides and lanthanides). The question...

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A wave can be considered as a mean that helps the energy to travel from one point to another. Waves can be classified with respect to their characteristics, such as the direction of movement of...

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Collections of highly specialized cells are found in multicellular organisms. For instance, in animals, there can be found many types of specialized cells, such as skin cells or nerve cells. The...

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• Science
Law of photochemical equivalence represents a basic law in photochemistry. Quantum theory of light states that the energy is emitted or absorbed in small groups of quanta, having the energy `e =...

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