Science Questions and Answers

Science

Copper is one of the transition elements and thus exhibits variable oxidation states. It has two valencies: +1 and +2 and the corresponding atoms are termed as Cuperous (+1 valency) and Cupric (+2...

Latest answer posted December 27, 2015 7:15 am UTC

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Science

The D.N.A. molecule is a double helix. This means that it resembles a ladder that is twisted. The sides of the ladder consist of sugar and phosphate groups. In the center of the ladder are...

Latest answer posted January 5, 2012 9:02 am UTC

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Science

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"...

Latest answer posted September 29, 2015 12:37 am UTC

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Science

Materials that are poor conductors of electricity are called insulators. Some examples are solid ionic compounds, non-metal elements, glass and plastics that are polymers of hydrocarbons. The...

Latest answer posted January 21, 2016 12:03 am UTC

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Science

Humans store fat in nearly every place on their bodies. Over half of that fat can be found in an area called the hypodermis, a layer of elastin and loose tissue just below the dermis layer of the...

Latest answer posted May 23, 2018 5:43 am UTC

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Science

The natural frequency of a mass-spring system is given as: `f_n = 1/(2pi) sqrt(k/m)` where, fn is the natural frequency, k is the spring constant and m is the mass. Here, m = 0.34 kg and time...

Latest answer posted February 19, 2016 12:53 pm UTC

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Science

Based on the general definition of weight, which is defined in physics by the formula: Weight=Mass times Force of acceleration due to gravity, objects do not weigh less in water. They actually are...

Latest answer posted February 10, 2016 9:47 pm UTC

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Science

Eukaryotic cells have two parts of the cell cycle: Interphase and mitotic phase. It is the interphase in which a cell typically spends most of its time. During interphase, a cell grows and carries...

Latest answer posted October 19, 2015 2:28 am UTC

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Science

I think you must be mistaken with your phrase "anti-iron." I have never heard of this phrase before. A quick search around the internet shows absolutely no credible mention of the phrase...

Latest answer posted February 7, 2016 3:50 pm UTC

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Science

Sulfuric acid or `H_2SO_4`is a strong acid and ionizes in two steps. In the first step, one proton is donated and the chemical equation for this step can be written as: `H_2SO_4 -> H^+ +...

Latest answer posted April 3, 2016 1:19 pm UTC

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Science

Industrialization has some strong drawbacks. Industries require a large amount of raw materials in order to produce products for consumers. This depletes the number of raw materials such as coal,...

Latest answer posted January 10, 2019 8:40 pm UTC

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Science

A biomolecule is, by definition, any molecule present in a living being. There are 4 main biomolecules: proteins, nucleic acids, carbohydrates and lipids. All these have their own unique functions...

Latest answer posted May 26, 2016 2:42 am UTC

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Science

`AgNO_3_(aq)+KI_((aq)) rarr AgI_((s))+KNO_3_(aq)` This is already a balanced equation. When we add KI to `AgNO_3` as the result AgI will precipitate. So the net reaction will be the reaction of...

Latest answer posted September 19, 2012 6:02 am UTC

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Science

`d=vt + (1/2)at^2` Solve for a. Please note that I have eliminated the "1" subscript from the v for clarity's sake. The first step is to subtract v1t from both sides of the equation:...

Latest answer posted September 28, 2012 1:56 am UTC

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Science

Active and passive transport are the movement of chemical species from one area of a cell to another. The main difference between the two is that active transport requires chemical energy in the...

Latest answer posted November 18, 2011 11:37 pm UTC

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Science

The seven characteristics of living beings are: Motion: Living things move. For example, human beings and animals walk, plants have parts that help them move in response to the motion of the Sun....

Latest answer posted March 29, 2018 1:52 am UTC

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Science

Monocots and dicots are both types of angiosperms. The "mono" in the word monocot refers to the seed's single cotyledon. The "di" in the word dicot refers to the seed's two cotyledons. However,...

Latest answer posted December 1, 2015 6:08 pm UTC

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Science

The acceleration of a body is defined as the rate of change of velocity. If v is the velocity of a body and t denotes time, then acceleration, a, of a body can be written as: a = dv/dt When...

Latest answer posted December 1, 2015 8:06 am UTC

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Science

Molar mass `CH_4 ` = 16g/mol `O_2 ` = 32g/mol `CH_4+2O_2 rarr CO_2+2H_2O` Number of `CH_4` moles added `= 8/16 = 0.5 mol` Number of `O_2` moles added `= 15.9/32 = 0.497 mol` Mole ratio...

Latest answer posted January 13, 2013 3:05 am UTC

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Science

Q1 = 6.9 `mu` C, Q2= -9 `mu` C and Q3 = -5 `mu` C, side length, a = 1.2 m. Since the figure is not given, I am assuming Q2 and Q3 are along x-axis and Q1 is in first quadrant. Net force on Q1 due...

Latest answer posted October 3, 2015 4:27 pm UTC

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Science

A 'plug' is a device that attaches to the end of an electrical wire and fits into an electrical current socket, usually situated in walls. The 2-pin plug consists of two prongs, one called the...

Latest answer posted November 14, 2015 2:05 pm UTC

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Science

The reason granulated sugar dissolves faster than a sugar cube has to do with surface area. A sugar cube is tightly compacted granulated sugar, meaning it has less surface area exposed to the...

Latest answer posted July 20, 2016 4:09 pm UTC

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Science

Weathering is the process of breakdown of rocks and soil by a number of agents. Unlike erosion, weathering does not involve the motion of rocks. Various weathering agents are: Water: causes...

Latest answer posted December 7, 2015 1:05 am UTC

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Science

Models are used to imitate or mimic the real life or field conditions. They can be mathematical, computational, graphical or conceptual in nature. Models are used to simulate reality and make...

Latest answer posted September 11, 2015 12:49 am UTC

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Science

Motivation affects reading. If someone is bored by the reading material, they won't want to do it. Also, being able to decode what you are reading is important. Being able to understand vocabulary...

Latest answer posted July 31, 2012 1:07 pm UTC

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Science

Nitric acid is HNO3. Potassium carbonate is K2CO3. Nitric acid is an acid and potassium carbonate is a base, so this is an acid/base chemical reaction. The unbalanced chemical reaction is shown...

Latest answer posted November 22, 2015 6:20 pm UTC

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Science

Specific heat is the amount of heat required to raise the temperature of a substance a certain amount. Latent heat is the amount of heat released during a change of state, i.e. the boiling of water...

Latest answer posted March 31, 2012 9:56 am UTC

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Science

In this problem, we can solve this by comparing which of the reactants will produce the least amount of product. `2 SO_2 (g) + O_2 (g) -> 2 SO_3 (g)` So we will solve for the number of moles of...

Latest answer posted March 1, 2013 12:25 am UTC

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Science

In domestic electrical connections, we have three different types of wiring: live or hot wire, neutral wire and earth wire. Each electrical circuit is composed of these wires, each of which is...

Latest answer posted February 3, 2016 1:02 pm UTC

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Science

The oxidation number of this molecule, called a bromate molecule, is -1. It should be correctly written BrO3-. It has this net charge of negative 1 because the bromine has an oxidation number...

Latest answer posted January 30, 2012 6:28 am UTC

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Science

Science is a boon or benefit to us because it provides us with a systematic way of asking and answering questions about the observable physical and living things around us.Science provides us with...

Latest answer posted February 8, 2011 11:04 pm UTC

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Science

There are a number of similarities between viruses and cells. Both are too small to be seen with naked eyes and require a microscope for observation. Both contain genetic material, in the form of...

Latest answer posted January 26, 2016 2:38 pm UTC

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Science

Arthropods are the larger of the two groups of invertebrates, and mollusks are the second largest. Invertebrates are animals without backbones. Arthropods have a hard exoskeleton, made out of...

Latest answer posted May 21, 2012 5:49 pm UTC

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Science

The relation between the angle of incidence and the angle of refraction is known as Snell's Law. Since the light travels with different speed in different media, the direction of the ray of light...

Latest answer posted September 30, 2015 11:10 pm UTC

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Science

The most environmentally friendly way to dispose of an electric blanket is not to truly dispose of it at all. By that I mean to see that it ends up somewhere other than a landfill. You could cut...

Latest answer posted February 27, 2013 1:45 am UTC

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Science

Speed is the ratio of the distance traveled over the time taken to travel. 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...

Latest answer posted February 12, 2016 11:36 am UTC

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Science

We are looking at the combustion of benzoic acid to water and CO2. Combustion always occurs in the presence of oxygen from the atmosphere. C6H5CO2H +O2 --> CO2 + H2O Every carbon from benzoic...

Latest answer posted October 22, 2012 4:12 am UTC

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Science

Maple trees have a number of adaptations to ensure their survival and operation. They have broad leaves to capture the maximum amount of sunlight for photosynthesis. However, they lose these leaves...

Latest answer posted February 18, 2016 12:55 pm UTC

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Science

It is safe to inject small quantities of sterile normal saline into the buttocks using new disposable needles and syringes, and doing so under supervision of a nurse or physician instructor. I...

Latest answer posted September 24, 2011 6:33 am UTC

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Science

Let us consider we have 100g of the compound. So then we will have 63.52g of iron and 36.48g of sulphur. Molic weight Fe = 56g/mol S = 32g/mol Amount of Fe moles in 100g of compound `= 63.52/56...

Latest answer posted February 4, 2013 2:42 am UTC

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Science

Natural light is the light generated naturally. The most common source of natural light on Earth is the Sun. We receive natural light throughout our sunlight hours, whether we want it or not. That...

Latest answer posted March 15, 2016 9:55 am UTC

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Science

Chemical reactions occur when the atomic structure of reactants are rearranged to make new products. The following are signs that a chemical reaction may have occurred: 1. The formation of a...

Latest answer posted February 5, 2016 9:48 pm UTC

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Science

The Arctic willow or Salix arctica is a resident of the North American Tundra and has adapted to the weather conditions of this region. The Arctic willow forms a pesticide to keep the predator...

Latest answer posted November 4, 2015 11:42 pm UTC

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Science

Mitochondria is the "power house" where oxygen and glucose are converted into energy. Nucleus is the control center and holds all of the cells information (DNA) Ribosomes are the protein...

Latest answer posted September 12, 2012 11:08 pm UTC

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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,...

Latest answer posted October 27, 2013 4:50 am UTC

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Science

Transcription and translation are processes for protein synthesis in both Eukaryotic and Prokaryotic cells. During transcription, RNA (Ribose Nucleic Acid) is synthesized from DNA (De-oxy Ribose...

Latest answer posted November 7, 2013 1:59 pm UTC

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Science

This sounds like a very specific question for class, so pay attention to your class notes or your text, as their reasons may not be the same as the ones I am about to provide. 1) Background...

Latest answer posted August 27, 2011 7:40 am UTC

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Science

The main factors affecting breathing rate are the levels of carbon dioxide and oxygen in the blood, and the blood's pH. The circulatory system has many, many small capillaries that are next to the...

Latest answer posted December 23, 2015 5:02 pm UTC

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Science

If you mix 50 ml of water with 50 ml of ethanol, the total volume actual equals less than 100 ml. The reason the mixture does not add up to 100 ml is because the molecules that make up ethanol are...

Latest answer posted October 12, 2015 1:10 am UTC

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Science

The thymus gland is a small organ in the neck which produces thymosin, which stimulates the production of T-cells for the immune system. The thymus is only active until puberty, when it begins to...

Latest answer posted February 6, 2016 12:18 am UTC

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