Homework Help

We’ve answered 319,745 questions. We can answer yours, too.

Ask Your Question
Filter Questions

» Browse Popular Topics
  • Science
    The short answer is that velocity is the speed with a direction, while speed does not have a direction. Speed is a scalar quantity -- it is the magnitude of the velocity. Speed is measured in units...

    Asked by azzyj on via web

    2 educator answers

  • Chemistry
    https://www.youtube.com/watch?v=-r_9QZXwT2c A compound is a chemical combination of two or more elements in definite proportions. For example, two hydrogen molecules + one oxygen molecule= one...

    Asked by cm16 on via web

    4 educator answers

  • Science
    While the functions and applications of a computer are almost endless, we can sense four primary purposes that are all linked to data (information): Entering data, manipulating data, viewing...

    Asked by malfoyxx321 on via web

    1 educator answer

  • Science
    A rainbow is made by the reflection and refraction of light that interacts with raindrops. Depending on how this interaction occurs with your location relative to the sun and the raindrops you may...

    Asked by enotes on via web

    7 educator answers

  • Science
    Solute and solvent are the two components of a solution. A solvent is a substance that dissolves the solute. And the solute is the substance being dissolved. To identify them, take note that if the...

    Asked by anum30140a on via iOS

    1 educator answer

  • Solar System
    Our data has improved considerably in the last 20 years. Mercury: no moons Venus: no moons Earth: 1 moon Mars: 2 moons, Phobos, Deimos Jupiter: 67 moons, some of which do not yet have proper...

    Asked by enotes on via web

    1 educator answer

  • Science
    Reptiles are cold-blooded animals. They typically lay hard shelled eggs and have skin covered with scales or a bony external plate. They either have four legs or descended from four limber...

    Asked by topher01 on via web

    1 educator answer

  • Speech
    If this is a persuasive speech, any of the hot-button political issues would probably do the trick: - Gun control: good or bad? - The death penalty: use it or not? - School dress codes: good or...

    Asked by hima-20 on via web

    11 educator answers

  • Science
    Take note that the nucleus of an atom is composed of protons and neutrons. And the number of particles present in the nucleus is referred as mass number (Also, called as atomic mass). mass number =...

    Asked by laineyroy on via iOS

    1 educator answer

  • Chemistry
    Compounds are substances that can be broken down through various chemical processes into elements. Elements are substances that cannot be broken down any further; all the atoms of an element are...

    Asked by oliviastabley on via web

    3 educator answers

  • Science
    Helpful bacteria: E. Coli are found in the intestines of humans and aid in digestion. Streptomyces is used in making antibiotics. Rhizobium are helpful bacteria found in the soil. They convert...

    Asked by cakeyum3838 on via web

    1 educator answer

  • Science
    The cell theory is an explanation of what cells are and why they exist. The three main parts are: 1) All living things are made of cells and their products, 2) New cells are created by old cells...

    Asked by mgoun on via web

    2 educator answers

  • Science
    Differences: - DNA is double-stranded, RNA is single-stranded. - DNA contains a pentose sugar Deoxyribose, RNA contains the pentose sugar Ribose. A pentose is a 5-carbon sugar molecule. - DNA is...

    Asked by bubbles13 on via web

    2 educator answers

  • Science
    There are several observations that we can identify some chemical reaction have taken place with in a system. Change in temperature-usually when a reaction takes place heat will be absorbed or...

    Asked by connorcolin3 on via web

    1 educator answer

  • Science
    Polar and non-polar molecules A molecule is classified as a polar moleculewhen the arrangement of the atoms is such that one end of the molecule has a positive electrical charge and the other end...

    Asked by soccergirl21 on via iOS

    1 educator answer

  • Biochemistry
    This question deserves several "answers" aimed at different levels.For elementary-school students, it is important to know that photosynthesis is how green plant cells trap sunlight to...

    Asked by Scott Locklear on via web

    2 educator answers

  • Environmentalism
    Protecting the environment includes the indoor environment and indoor air quality. One way to protect the indoor environment is not to bring indoors any products with surfactants in them. This...

    Asked by mimi101 on via web

    7 educator answers

  • Science
    Renewable energy sources are ones which don't run out - which can be renewed. We can keep using them and using them, and we'll never run out. Examples of renewable sources include wind, water power...

    Asked by fjnfkbjnkgjdf on via web

    1 educator answer

  • Science
    Solutions are formed by mixing solute in a solvent. Thus, a solution is a homogeneous mixture. We can find a number of solutions in our homes. Here is a brief list: Salt water is formed when we mix...

    Asked by kebora13 on via web

    1 educator answer

  • Science
    The four basic functions of a computer system are as follows: input output processing storage Let's look at each individually: Input Transferring of information into the system. This may be through...

    Asked by sarafina12345 on via web

    2 educator answers

  • Biochemistry
    DifferencesPassive transport doesn't require energy (ATP), active transport does require energy.Passive transport moves molecules WITH the concentration gradient (high to low), while active...

    Asked by ttt12 on via web

    2 educator answers

  • Science
    Breathing is a necessary function for human beings. It supplies oxygen for a process called cellular respiration, which is how cells manufacture the energy they need for their life functions....

    Asked by ofomfli on via web

    1 educator answer

  • Earth Science
    Fossils are formed when the body of a living organism that has died is covered and protected from decay by microorganisms and attacks by predators. Usually fossils are formed when a layer of...

    Asked by gahs14 on via web

    2 educator answers

  • Biology
    The cell cycle of a somatic cell consists of interphase and mitosis/cytokinesis. During interphase, which occurs prior to mitosis, there are 3 phases: G1, S, and G2. During the G phases the cell...

    Asked by dgault11 on via web

    1 educator answer

  • Science
    There are a couple of ways to determine if a reaction is exothermic or endothermic. Endothermic meaning that heat is added to the reaction to make the reactants interact and exothermic meaning heat...

    Asked by kano on via web

    2 educator answers

  • Chemistry
    You cannot directly convert grams to atoms. First you must covert your grams to moles, then you can take the moles and covert to atoms. If you take your 878 grams of fluorine and then look at the...

    Asked by msdee on via web

    1 educator answer

  • Physics
    In a house, there are many electrical appliances that have to run independent of each other. If one appliance is turned on or off it should not affect the other appliances. This is not possible if...

    Asked by kylekasman on via web

    1 educator answer

  • Science
    Earthquakes are catastrophic phenomenon caused by abrupt shifts in the earth's rock along fault lines. There is no way to prevent these occurrences. There are several ways that we try to minimize...

    Asked by tanya-gupta on via web

    4 educator answers

  • Science
    Both the smooth and rough endoplasmic reticulum help in the production and storage of proteins The main difference is that one contains ribosomes on it and the other does not. The rough endoplasmic...

    Asked by enotes on via web

    1 educator answer

  • Science
    First, lets make sure we understand the word "ratio". A ratio is a comparison of any two things, usually in numerical form. We could compare the number of boys in one of my classes to the number...

    Asked by magicgirl12 on via web

    1 educator answer

  • Physics
    The formula for pressure is P = F/A In this equation, P stands for pressure while F stands for force and A stands for area. Pressure is typically measured in a unit called the Pascal. So what this...

    Asked by ustaad on via web

    1 educator answer

  • Biology
    The depends on how you define "in." Most stories about spiders laying eggs under human skin, or in the muscular tissue, are urban myths. They aren't supported by evidence, and mostly show...

    Asked by blueeyes1335 on via web

    1 educator answer

  • Physics
    The term "relative density" means the same as "specific gravity." It is a measure of how dense one thing is when compared to a given reference. The reference is usually water. With respect to...

    Asked by mahmuda092569 on via web

    1 educator answer

  • Science
    Sodium chloride (NaCl) and silver nitrate (AgNO3) are both solids that are highly soluble in water. They give a double displacement reaction where the ions switch places and give sodium nitrate...

    Asked by sexymama1267 on via web

    1 educator answer

  • Science
    Similarities ... → Both involve in production of energy → Both involve the exchange of gases → Both the process takes place in cell organelle which was...

    Asked by akatude on via web

    3 educator answers

  • Geology
    There are generally two versions of the answer to this question. The first is the more general about 70% of Earth is water while about 30% is land (US Geological Society). The second is the more...

    Asked by smallys-army on via web

    2 educator answers

  • Science
    The four spheres show how the four main components of Planet Earth form a complete system. These main components are land, air, water, and life. The lithosphere, also known as Geosphere is made of...

    Asked by jarmel on via web

    1 educator answer

  • Science
    The purpose of the battery in a series circuit is to give the circuit a source of energy. The purpose of a switch in a series circuit is to make it easy to open or close the electrical circuit,...

    Asked by ranon on via web

    1 educator answer

  • Science
    It is very important to do this for two reasons. First, and perhaps most important, we are in danger of ruining the planet's climate through carbon dioxide emissions. If we continue to use fossil...

    Asked by merishorverde on via web

    2 educator answers

  • Science
    A monotreme is a mammal that lays eggs. This means that they do not give birth to live young. They also keep the eggs inside for a longer period of time to provide nutrients to the egg. An example...

    Asked by pops2 on via web

    2 educator answers

  • Science
    There are several differences between monocots and dicots, here are three big ones. The main one (that gave rise to the names) is that monocots have seeds that are one piece (like corn), while...

    Asked by kalaun on via web

    2 educator answers

  • Science
    This is an example of a combustion reaction. To answer this you must first balance the equation. The easiest way is to set up the reaction equation without any coefficients: C2H6O + O2 --> CO2...

    Asked by chocolate975 on via web

    1 educator answer

  • Science
    There will be far-reaching effects. If for example, the producer is removed, the consequences could be dire. Producers capture sunlight directly and make chemical energy for consumers. If this is...

    Asked by boogey--lee on via web

    1 educator answer

  • Science
    The difference between uniform and non-uniform mixtures is the degree at which the materials are mixed and the sameness of their composition throughout the mixture. Another word for a uniform...

    Asked by enotes on via web

    1 educator answer

  • Science
    The relationship between the two is that air temperature changes the air pressure. For example, as the air warms up the molecules in the air become more active and they use up more individual space...

    Asked by masterpieces on via web

    3 educator answers

  • Science
    Not many, newborn infants have more cartilage than bone at birth. This is why newborns are so limber, cartilage is more pliable than bone. Bones form and develop over time by a process called...

    Asked by victorsnanny on via web

    1 educator answer

  • Biology
    Using a light microscope, one can view cell walls, vacuoles, cytoplasm, chloroplasts, nucleus and cell membrane. Light microscopes use lenses and light to magnify cell parts. However, they usually...

    Asked by tlvw on via web

    1 educator answer

  • Science
    Any object will accellerate due to gravity -9.81 m/s^2. By integrating this acceleration over time, one obtains the velocity at any time t. v = gt + v0. In this case, the ball started at rest, so...

    Asked by papertee on via web

    1 educator answer

  • Science
    The chemical formula of sodium carbonate (washing soda) is Na2CO3. When it is heated it undergoes a thermal decomposition reaction. This takes place above 500 degree C. The reaction of...

    Asked by t521863 on via web

    1 educator answer

  • Science
    Acids are species with pH less than 7, while bases those with pH greater than 7. Depending on the definition used - Arrhenius, Bronsted-Lowry, or Lewis - acids can be described as proton donors,...

    Asked by monkeygirlwow on via web

    1 educator answer

Showing 1–50 of 22,104