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  • Science
    If the number of atoms of helium gas are doubled, the moles of gas are also doubled. We can find the number of moles of a gas, by using the idea that each mole of a gas contains an Avogadro's...

    Asked by user214975 on via web

    1 educator answer.

  • Science
    The atomic radius of an atom is the distance between the nucleus of an atom to its outermost electron. Atomic radius is an example of a periodic trend. Periodic trends are patterns of properties...

    Asked by abdulmoez15 on via web

    1 educator answer.

  • Science
    The collision theory states that a reaction occurs when the collision between molecules cause old bonds to become broke and new bonds to form. However, the collisions must occur with enough energy,...

    Asked by bibi224 on via web

    1 educator answer.

  • Science
    "A 1000 W microwave" means that the microwave uses the power of 1000 Watts when it is on. Power is the rate of the consumption of energy: `P = (Delta E)/(Delta t)` , assuming the energy is consumed...

    Asked by sarianahall22 on via web

    1 educator answer.

  • Science
    A volcano is a geologic formation from which the molten rocks (lava) and hot gases emerge onto the surface of Earth (or any other planet). Typically a volcano is a mountain from which the molten...

    Asked by awesomealmakatana on via web

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  • Science
    A runner runs 100 meters in 12 seconds and we are asked to find the average speed: The average speed is the total distance divided by the total time over some interval. (This is the rate of change...

    Asked by user104621 on via web

    1 educator answer.

  • Science
    Zero. A bit fat 0. The reason it's called the "Hadean eon" is after Hades, which is the Greek word for the underworld---it's meant to invoke fire and brimstone, because that's what the world was...

    Asked by autumnkpinkme on via web

    1 educator answer.

  • Science
    Typically, the word "interior" is used to mean "inside". For example, when we are discussing various cell organelle (specialized structures that carry out specific functions), we commonly use the...

    Asked by ninaalaboyy823 on via web

    1 educator answer.

  • Science
    The process of phosphorylating ADP to form ATP and removing a phosphate from ATP to form ADP in order to store and release energy respectively is known as the ATP cycle. ATP stands for adenosine...

    Asked by user8441766 on via web

    1 educator answer.

  • Science
    Organelle are structures within cells that have specialized functions. Some of the key organelle in an animal cell are nucleus, mitochondria, golgi apparatus, cell membrane, endoplasmic recticulum,...

    Asked by alexmay123123 on via web

    1 educator answer.

  • Science

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  • Science
    A star’s apparent brightness is not the same as its absolute brightness. The following definitions were provided by the Chandra X-ray Observatory’s glossary that was published by Harvard. A...

    Asked by enotes on via web

    1 educator answer.

  • Science
    The best choice to identify carbon dioxide gas is the limewater test. Limewater is an aqueous solution of calcium hydroxide. When CO2 is bubbled through lime water a precipitate of calcium...

    Asked by sararobideaux on via web

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  • Science
    Any material can be classified as either an element, a compound or a mixture, depending on its properties. An element is composed of identical atoms and can not be further divided. An example is...

    Asked by enotes on via web

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  • Science
    Speed of light is the theoretical limit to the speed of an object. In fact, no object can reach the speed of light. Think about the scenario using Newton's Second Law of Motion which states that...

    Asked by enotes on via web

    1 educator answer.

  • Science
    Hello! Yes, instantaneous speed and average speed can be equal (and can be different). The simplest case is when a body has a constant speed, then its instantaneous speed is the same at any moment,...

    Asked by enotes on via web

    1 educator answer.

  • Science
    For the mentioned reaction, the balanced chemical equation is: `` The reactants are hydrochloric acid (HCl) and sodium hydroxide (NaOH) and the products are sodium chloride and water. We can use...

    Asked by gabbiesaboss1738 on via web

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  • Science
    Forensics is used, generally, in criminal and civil law suits. Forensics or forensic science is the collection, preservation and analysis of evidences. The information so obtained is then used in a...

    Asked by nykeyagray10 on via web

    1 educator answer.

  • Science
    A salt can be produced by titration under two conditions: 1. If it’s soluble so that it precipitates out of solution. 2. If there’s a change in pH, color or conductivity that allows for...

    Asked by user4051659 on via web

    1 educator answer.

  • Science
    If the output power of the light source is P = 0.1 Watt, the intensity of the light at the location of the potassium foil (d = 0.5 meters away) will be `I = P/(4pid^2) = 0.1/(4pi(0.5)^2) = 0.032...

    Asked by user2375185 on via web

    1 educator answer.

  • Science
    Organic compounds are the compounds that contain carbon. There are a very large number of organic compounds around us, including those contained in our very own bodies, plants, animals, etc. Apart...

    Asked by gradztabala on via web

    1 educator answer.

  • Science
    Sun is our star and is the source of life on Earth. It keeps the Earth warm enough and provides sunlight to plants for making food and oxygen. The Sun has 3 layers, known as the core, radiative...

    Asked by user7474839 on via web

    1 educator answer.

  • Science
    We can use equations of motion to solve this problem. Using `v^2 = u^2 + 2as` for the part where the ball drops from the height of 3 m, we can calculate the ball's velocity as it hits the ground....

    Asked by mtshii on via web

    1 educator answer.

  • Science
    Reactivity is a measure of the reaction potential of an element. In other words, reactivity of an element tells us the likelihood of an element reacting with another element. For example, an...

    Asked by stephie28 on via web

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  • Science
    Designer babies are babies specifically 'designed' by using genetic engineering to contain some specific traits. These traits could pertain to intelligence, hair color, eye color, health, etc. This...

    Asked by user4271069 on via web

    1 educator answer.

  • Science
    Half life of an element refers to the time period over which half of the original amount of element will degrade and we will be left with only 50% of the original amount. For example, if the half...

    Asked by dashkalove97 on via web

    1 educator answer.

  • Science
    Fishes constitute three of the seven classes of vertebrates (the others being amphibian, reptiles, birds and mammals). Fishes are different from the other vertebrates because they have gills for...

    Asked by user1093667 on via web

    1 educator answer.

  • Science
    Hello! The density of something, by definition, is the the mass m of this something divided by its volume V: `rho` = m / V. For heterogeneous objects this is the definition of an average density....

    Asked by oliveoil809 on via web

    1 educator answer.

  • Science
    Sonar is a commonly used device to measure the depth of a water body, such as river, sea, pond, etc. The term SONAR stands for sound navigation and ranging. Sonar uses sound waves and determines...

    Asked by user1486538 on via web

    1 educator answer.

  • Science
    Speed is the ratio of distance traveled and time taken for this motion. It gives us an idea of how fast an object is moving. It is a scalar quantity, that is, it only has a magnitude but no...

    Asked by emilyflores359 on via web

    1 educator answer.

  • Science
    If a sunspot were pointed right at Mercury in this way, the planet would become even more mind-bogglingly hot.Sunspots look dark in our visual spectrum, so we might suspect that they are colder (or...

    Asked by jaheimknight28 on via web

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  • Science
    In comparison to other members of the electromagnetic spectrum (such as visible light, infrared, ultraviolet rays, etc.), gamma rays have the longest frequency and hence the smallest wavelength....

    Asked by user7645118 on via web

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  • Science
    The matter that we observe around us is composed of protons and neutrons, which in turn are composed of quarks. The quark is an elementary particle that interacts through the strong nuclear force....

    Asked by sweetsmiley125 on via web

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  • Science
    Hydrolysis is the process by which large polymers are broken down into their sub-- units known as monomers. These monomers are small molecules that are repeated inside the larger polymer and held...

    Asked by rosegardengate57 on via web

    1 educator answer.

  • Science
    Groups on the periodic table are the vertical columns. Sometimes groups on the periodic table are called families. Main group elements that are in the same group on the periodic table share similar...

    Asked by user6441208 on via web

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  • Science
    Nitrogen triiodide contains 3 atoms of iodine as the name suggests (note the word "tri"). It has a chemical formula of `NI_3` . Since it decomposes into nitrogen gas (represented as `N_2`) and...

    Asked by hachambers on via web

    1 educator answer.

  • Science
    The principal axis of a spherical mirror is a line going through the center of the mirror that is exactly perpendicular (sometimes said "normal") to the surface of the mirror. By definition, a...

    Asked by josviedsouzarocks17 on via web

    1 educator answer.

  • Science
    Hello! To find momentums we need the speeds before and after collision. The simplest way to find these speeds is to use the energy conservation law. Before fall, a ball had only potential energy...

    Asked by habeeb2hover on via web

    1 educator answer.

  • Science
    As the warm air rises up, the temperature falls down (that is, the air cools down) and reaches the dew point. At this stage (when the air temperature is equal to the dew point), condensation...

    Asked by sofiaisabellacastro2003 on via web

    1 educator answer.

  • Science
    Contact forces are the forces (as the name suggests) that act when two bodies are in contact with each other. In comparison, non-contact forces work without direct contact between bodies. Some...

    Asked by user6916548 on via web

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  • Science
    Pollen is the male part of a plant and needs to be dispersed, ideally, away from the parent plant. This pollen dispersal increases genetic diversity, protects the species from extinction and...

    Asked by vargaskayl on via web

    1 educator answer.

  • Science
    The general equation for the hydrolysis of a halogenalkane is: RBr + H2O `->` ROH + H+ + Br- In this equation, “Br- “ represents a halogen. Halogenalkanes are also known as haloalkanes or...

    Asked by on via web

    1 educator answer.

  • Science
    When sodium metal is added to ethanol, the following chemical reaction takes place: `2 C_2H_5OH + 2Na -> 2C_2H_5ONa + H_2` Thus, we can see that hydrogen gas is evolved when sodium reacts with...

    Asked by on via web

    1 educator answer.

  • Science
    When ethanol is heated with potassium dichromate (acidified with dilute sulfuric acid), the dichromate oxidizes the ethanol to ethanoic acid. The oxidation equation is written as: `C_2H_5OH + H_2O...

    Asked by on via web

    1 educator answer.

  • Science
    Hurricanes may lose strength over land because of cool temperatures, a lack of moisture, and/or friction. Hurricanes form over low pressure regions with warm temperatures over large bodies of...

    Asked by enotes on via web

    1 educator answer.

  • Science
    You refer to the book Never Cry Wolf, written by naturalist Farley Mowat. In 1948-49, Mowat was sent by the Dominion Wildlife Service (renamed the Canadian Wildlife Service in 1950) to investigate...

    Asked by mackenzienewhart on via web

    1 educator answer.

  • Science
    Pure water is composed entirely of water molecules. A sample that is composed of only one substance is called a pure substance. Mixtures contain two or more different types of substances. The...

    Asked by enotes on via web

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  • Science
    Fungi and plants are two different kingdoms of multicellular eukaryotic cells. Being multicellular means that fungi and plants are made of many specialized cells. Being eukaryotes implies that the...

    Asked by enotes on via web

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  • Science
    Diffusion is a transport mechanism (another example of a transport mechanism is advection) in which the material moves from a region of higher concentration to a region of lower concentration....

    Asked by enotes on via web

    1 educator answer.

  • Science
    The nitrogen cycle is one of the cycles of matter and details the movement of various forms of nitrogen through the components of the environment. There are different forms of nitrogen, such as...

    Asked by enotes on via web

    1 educator answer.

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