Science Questions and Answers

Science

Elements are types of atoms that have a unique number of protons. In fact, from left to right, the periodic table is arranged by the number of protons that each element contains. The periodic table...

Latest answer posted February 26, 2016 1:24 pm UTC

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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...

Latest answer posted May 24, 2010 10:43 am UTC

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Science

Fossil records are commonly used as the basis for evolution theory. These consist of fossilized animals and plants (and their parts). Fossilized remains of plants and animals belonging to different...

Latest answer posted October 2, 2015 5:55 am UTC

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Science

Cellular respiration and fermentation are both reactions that occur within organisms that use glucose as a reactant and produce energy in the form of adenosine triphosphate. The largest difference...

Latest answer posted March 26, 2016 10:30 pm UTC

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Science

This is an example of an electrostatic force that obeys Coulomb's Law. The size of the force will be proportional to the product of the charge of the nucleus and the innermost electron. It will...

Latest answer posted April 3, 2012 8:54 am UTC

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Science

Thermometers are used to measure temperature. Below is a list of some scenarios in which a thermometer might be used. - To measure the outdoor temperature. - To measure body temperature during a...

Latest answer posted October 22, 2015 12:21 am UTC

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Science

When performing chromatography, it is necessary to find a solvent that will dissolve the pigment in question. Water can dissolve polar solvents, but it is very poor at dissolving polar solvents. In...

Latest answer posted March 17, 2012 2:30 pm UTC

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Science

The focal length (f) of a lens is the distance between the center of the lens and the point at which the reflected light, of a beam of light travelling parallel to the center line, meets the center...

Latest answer posted June 1, 2013 9:48 pm UTC

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Science

According to the law of reflection, the angle of incidence and angle of reflection are equal. Both these angles are measured with respect to a line normal to the reflection surface. If I understand...

Latest answer posted January 11, 2016 3:28 am UTC

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Science

The following are the ionization energies for the elements in the second period: Lithium - 520 Beryllium - 900 Boron - 801 Carbon - 1087 Nitrogen - 1402 Oxygen - 1314 Fluorine - 1681 Neon - 2081...

Latest answer posted May 11, 2013 12:55 pm UTC

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Science

CH4(g) + 2O2(g) --> CO2(g) + 2H2O(g) deltaH=-802.4 kJ/mol CH3OH(g) + 3/2O2(g) --> CO2(g) + 2H2O(g) deltaH=-676 kJ/mol You had left out the CO2 term in the first reaction so I added it...

Latest answer posted October 24, 2013 6:20 pm UTC

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Science

Elements that are metals tend to lose electrons and become positively charged ions called cations. Elements that are nonmetals tend to gain electrons and become negatively charged ions called...

Latest answer posted March 12, 2016 7:52 pm UTC

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Science

One way to remember the difference between the geocentric model and the heliocentric model is to look at the etymology of the words. Geocentric means the Earth is at the center. The prefix geo...

Latest answer posted June 26, 2015 4:40 pm UTC

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Science

The Coriolis effect occurs because of Earth's rotation and the fact that the atmosphere and oceans are not "connected" to the solid part of the planet.1. Atmospheric Circulation PatternsEarth...

Latest answer posted August 19, 2009 5:15 pm UTC

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Science

This can be simply explained as below. when you have longer length of wire, the current has to travel more distance, more the distance higher the number of obstacles it faces through its path....

Latest answer posted May 1, 2012 12:11 am UTC

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Science

The Grammar Translation Method (GTM) is an method of second language instruction based mostly on the translation of passages from the native language into the target language. Along the way,...

Latest answer posted October 3, 2012 6:05 pm UTC

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Science

The lapse rate is the rate at which the temperature changes as the altitude changes. It is calculated by the following expressions: Lapse rate = - (change in temperature)/ (change in altitude) It...

Latest answer posted May 10, 2016 12:09 pm UTC

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Science

Oxygen is an element and elements have atoms. Oxygen gas is a compound consisting of molecules of oxygen, with each molecule consisting of two oxygen atoms (chemically represented as `O_2` ). The...

Latest answer posted December 19, 2015 4:06 pm UTC

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Science

While playing guitar, the most relevant types of energy involved in the process are the sound, kinetic, thermal, muscle, elastic and electric energy. The latter may not be involved if you're using...

Latest answer posted March 12, 2016 1:44 pm UTC

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Science

A chemical reaction takes place when milk is mixed with vinegar. Milk contains protein, out of which about 80% is known as casein and the rest is called whey protein. When milk is mixed with...

Latest answer posted September 23, 2018 6:02 am UTC

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Science

We use several products of science everyday and science is pretty much involved in all our activities. Some of the key scientific products that we use daily include, electricity, transportation...

Latest answer posted October 27, 2015 5:06 pm UTC

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Science

A food chain is a simplification within an ecosystem and depicts the flow of food and energy through a series of organisms (including plants). A food web is a series of interconnected food chains...

Latest answer posted November 18, 2015 2:59 pm UTC

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Science

A car is not a living thing because it does not fulfill some key characteristics that define living things. All living things are composed of cells. Unicellular organisms are composed of a single...

Latest answer posted April 18, 2016 12:33 pm UTC

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Science

The electricity provider charges $0.09 per kilowatt hour. The light bulb uses 60 watts and is run 24 hours a day. To calculate the cost of running the light bulb we need to calculate how many...

Latest answer posted December 5, 2015 7:43 pm UTC

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Science

The path that oxygen takes through the respiratory system is identified below in a flowchart format: Mouth or Nostrils of the Nose → Nasopharynx → Oral Pharynx → Glottis → Trachea → Lungs (Right...

Latest answer posted March 23, 2016 7:05 pm UTC

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Science

The atomic number of an atom is the number of protons. The atomic mass is the sum of the protons and neutrons. The net charge is the difference between the number of protons, which have positive...

Latest answer posted December 7, 2015 10:02 pm UTC

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Science

In order to understand the effect of impurities on boiling point, one must first understand what boiling point is. The boiling point of a solution is generally defined as the the temperature at...

Latest answer posted February 1, 2016 9:31 pm UTC

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Science

Microbiological research is no different than other types of research in other fields: you want to isolate variables and end up with one, specific final goal. In microbiology, sample cultures are...

Latest answer posted October 30, 2013 4:47 pm UTC

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Science

When magnesium reacts with hydrochloric acid, hydrogen gas and soluble magnesium chloride are produced according to the following equation: `Mg_((s)) + 2 HCl_((aq)) -> MgCl_2_(aq) + H_2_(g)` The...

Latest answer posted November 19, 2015 9:02 pm UTC

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Science

To understand this question properly, we must know what an acid is and what a base is. Asn acid is a substance that is a proton donor (H+). So if you look at the halides in terms of acid...

Latest answer posted July 5, 2012 6:01 pm UTC

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Science

Experimental variables can fall under three different classifications, independent variables, dependent variables, and constant (or control) variables. An independent variable is one of the input...

Latest answer posted October 5, 2012 1:57 am UTC

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Science

Absolutely. A is dominant to type O blood. If you are type A you can either have the genotype "AA" or "Ai", and if you are type O you will have the genotype "ii". If both parents are...

Latest answer posted January 12, 2013 10:18 pm UTC

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Science

Weathering is the process that occurs when rocks and other materials are broken down into smaller pieces. This can be done via the pressures exerted by the weather (rain, hail, sleet, etc),...

Latest answer posted November 6, 2015 10:37 am UTC

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Science

When dissecting a frog, fat bodies are easy to identify. The fat bodies in frogs are yellowish to orange in color. They have a finger-like or spaghetti-like shape. The fat bodies are needed for...

Latest answer posted May 1, 2012 5:14 pm UTC

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Science

The most way common method of preparing chlorine gas in the laboratory is by using manganese dioxide to oxidize hydrochloric acid, as shown by this equation: `MnO_2 + 4 HCl -> Cl_2 + MnCl_2 +...

Latest answer posted January 24, 2016 12:37 am UTC

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Science

`4Fe+3O_2 rarr 2Fe_2O_3` To get 2 moles of `Fe_2O_3` we need 4 moles of Fe and 3 moles of `O_2` . In the given mixture we have 4 moles of Fe and 2.5 moles of `O_2` . Since we need 3 moles of...

Latest answer posted February 1, 2013 3:33 am UTC

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Science

Humans affect the phosphorus cycle mainly by the use of fertilizers and raising livestock, especially hogs. Fertilizers and hog waste are high in phosphorus, which makes its way into the soil...

Latest answer posted April 27, 2012 8:55 pm UTC

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Science

Let us make sure we understand mass and weight are not the same thing. 80 kg of mass is not the same thing as 80 N of weight. To calculate weight, we use Newton's 2nd Law of Motion, which gives...

Latest answer posted December 27, 2011 10:00 am UTC

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Science

When you set up an experiment, you have to have one set up where you introduce the independent variable (the experimental set up) and one where you do not (the control). That way, you can compare...

Latest answer posted September 17, 2010 11:32 pm UTC

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Science

Microwaves are electromagnetic waves, whose frequency is between 300 megahertz (MHz) and 300 gigahertz (GHz) and a wavelength in the range of 1 m to 1 mm; therefore the microwave range is included...

Latest answer posted November 19, 2015 8:23 pm UTC

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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...

Latest answer posted September 6, 2010 2:24 pm UTC

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Science

According to the law of reflection, the incident ray (that falls on the mirror), reflected ray (that is reflected off the mirror) and the normal to the mirror, all lie on the same plane. More...

Latest answer posted January 20, 2016 11:48 pm UTC

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Science

In this day and age we seem to have a title for every possible type of occupation. You have already suggested the best titles for the occupations you mention: A man who repairs broken appliances is...

Latest answer posted October 14, 2010 4:57 am UTC

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Science

Aspirin (C9H8O4) is generated from salicyclic acid (C7H6O3) and acetic anhydride (C4H6O3) using the following synthesis reaction: C7H6O3 + C4H6O3 -----> C9H8O4 + C2H4O2 and since acetic...

Latest answer posted March 25, 2015 1:19 am UTC

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Science

You can only ask one question at a time so I edited down accordingly. We are asked to write the ionic equation for iron and copper (II) sulfate in aqueous solution. In an ionic equation, all...

Latest answer posted March 24, 2013 12:09 am UTC

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Science

Sodium chloride (NaCl) has a melting point of 801 degree Celsius, while that of magnesium chloride (MgCl2) is 714 degrees Celsius. Both sodium chloride and magnesium chloride are ionic solids. Such...

Latest answer posted March 12, 2016 10:42 am UTC

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Science

a) The frequency of the waves are = 2 Hz (since you are making two pulses every second) b)The period of the waves is 0.19 m (as the consecutive crests are separated by 0.19 m) c) V = L x f v =...

Latest answer posted April 29, 2012 2:45 pm UTC

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Science

A cup of hot tea can lose heat via conduction, convection, thermal radiation, and evaporation. Let's look at each one individually. Thermal radiation is the loss of heat from a solid object into...

Latest answer posted September 25, 2012 5:57 pm UTC

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Science

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,...

Latest answer posted September 29, 2015 8:46 pm UTC

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Science

If too much water is reabsorbed back into the body's system, the stool texture will be hard and dry causing constipation. If not enough water has been reabsorbed back into the body's system, the...

Latest answer posted May 9, 2013 10:06 pm UTC

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