# Science Homework Help

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• Science
The box will move according to the second Newton's Law: `vecF = mveca` , where `vecF` is the net force acting on the box, m is the mass of the box and `veca` is the acceleration. The net force on...

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• Science
Carbon tetrachloride has the formula CCl4. Carbon is the central atom. It shares one pair of electron with each of the four chlorine atoms, forming four single bonds. This completes the octet for...

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• Science
Without photosynthesis, the troposphere would contain so little oxygen that life could not be possible. Also, photosynthesis is particularly important in combating pollution and the greenhouse...

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• Science
Life sciences include all the areas of science that deals with living organisms. Microbiology is a sub-discipline of life sciences that deals with microscopic organisms (organisms too small to be...

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• Science
Before knowing the formula for finding friction force, you must understand what friction is. Friction is the resisting force created when the bodies of two objects come in contact with each other....

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• Science
Hello! The pressure, by definition, is the force divided by the area at which it acts (perpendicularly), `P=F/A.` Here `F=mg` where `F` is given and `g` is the acceleration of (Earth's, I believe)...

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• Science
Alternative resources are important because we are running out of conventional resources and/or we want to minimize the damaging effects of conventional resources. Fossil fuels are a great example...

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• Science
The shape of a landform can be altered by natural events such as earthquakes, tsunamis, landslides, volcanic eruptions, etc. Each of these acts could be violent enough to completely destroy...

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• Science
Parasitism is a relationship between two organisms in which one of them (called the parasite) lives off of the other organism (called the host). However, unlike in symbiosis, the relationship is...

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• Science
1) Beryllium: The atomic number of beryllium is 4 and its electronics configuration is `1s^2, 2s^2` . Looking at the electronic configuration, we can see that beryllium is a noble gas, since it has...

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• Science
Chromosomes are in the nucleus of a cell. Thus all cells that have a nucleus have chromosomes. The only cells in the human body that do not have a nucleus are red blood cells. Thus, all human...

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• Science
Magnesium phosphate has the formula `Mg_3(PO_4)_(2)` There are two phosphate ions in every formula unit. Each formula unit of magnesium sulfate that dissolves will produce two phosphate ions. Here...

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• Science
Strontium Chromate has the chemical formula: `SrCrO_4` that is, each mole of strontium chromate has 1 mole of strontium ion and 1 mole of chromate ions. Here, we are given with 4.3210 x 10^33...

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• Science
When the silver goblet was exposed to hydrogen sulfide and oxygen, 1.2 mol of silver sulfide formed. Silver sulfide tarnish appears black. This means 1.2 x Avogadro's number molecules of silver...

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• Science
If the DNA template strand is: ATG CTC CTT GGT CTT TCT GCA AGT GCT it can be copied to an mRNA in a process called transcription. The base pairing rules are basically the same as those in DNA...

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• Science
Photosynthesis is the process in which carbon dioxide and water are used, along with sun's light energy, to generate glucose and oxygen. Chemically this process can be represented as: `6 CO_2 + 6...

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• Science
Calcium Chloride has the formula `CaCl_2` Each formula unit, when dissolved in water, produces one calcium ion and two chloride ions. This give us the unit factor 1 CaCl2/2 Cl-. One mole of...

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• Science
Barium nitrate has the formula `Ba(NO_3)_2` This means that each formula unit of barium nitrate contains two nitrate ions. The number of nitrate ions in 1.563x10^30 is thus 2(1.563x10^30), or...

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• Science
The speed of light (about 300,000,000 meters per second) is the same for all observers, whether or not they're moving. Anyone moving at a constant speed should observe the same physical laws. this...

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• Science
Prophase I is the first step in meiosis. During meiosis a diploid cell (46 chromosomes) divides twice to produce 4 haploid (23 chromosome) cells. The body utilizes this process to produce gametes...

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• Science
During prophase I, crossing-over of parts of chromosomes can occur; this increases genetic variability. Prophase is the first stage of cell division. During meiosis, the type of division that...

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• Science
There is one chloride ion, Cl-, in each formula unit of NaCl. This means there are 5.13 moles of Cl- in 5.13 moles of NaCl. One mole is 6.02 x10^23 particles, so you would calculate the number of...

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• Science
The first compound, HCl is called hydrogen chloride and in solution it completely dissociates into its respective ions H+ and Cl- and is called hydrochloric acid. So it forms two ions. HCl...

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• Science
The representative partice of Ag is an atom, the representative particle of S20 is a molecule, the representative particle of O2 is a molecule and the representative particle of Fe is an atom. A...

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• Science
The representative particle for any given substance is the smallest unit of the substance found in nature. Ag is the element silver as found on the periodic table. Since it is a pure element, its...

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• Science
Obesity and being overweight are relatively subjective conditions that depend upon specific human definitions, in the same way that being tall is subjective. Part of this subjectivity comes from...

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• Science
When solution is neutralized it contains equal moles of H+ and OH-, or moles acid = moles base. Molarity (M) is a unit that expresses concentration in moles of solute per liter of solution: M -...

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• Science
Acid + Base = salt + water is the general form of a neutralization reaction, which falls into the broader category of double displacement. For example, hydrochloric acid and sodium hydroxide, a...

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• Science
`CH_4 + 2O_2 -> CO_2 + 2H_2O` This is an example of a combustion reaction. When a hydrocarbon combusts it reacts with atmospheric oxygen to produce water and carbon dioxide. Methane, having just...

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• Science
Temperature is a measurement of the average kinetic energy of the molecules in an object or a system. Kinetic energy is the energy that an object has because of its motion. The molecules in a...

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• Science
A sound wave is a disturbance that propagates through air or another medium. The disturbance, a vibration, is transmitted via a series of successive compressions and rarefactions (stretching) of...

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• Science
The answer depends on several factors associated with the system in question. One would need to know information about the membrane across which osmosis is occurring and the concentration gradient...

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• Science
Isotopes are atoms of an element that have the same atomic number (that is, same number of protons), but different atomic mass (that is, different number of neutrons). Isotopes find different uses...

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• Science
Number 9. The common name for all gasses and liquids is "fluids." Gasses and liquids do have different properties, but they are more similar to each other than they are to solids. Both liquids...

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• Science
Both procedures rely on high-frequency the reflection of sound waves. Both procedures determine the time that it takes for the high-frequency sound waves to hit objects in order to create images of...

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• Science
During the life cycle of a cell, although chromosomes are always present, at certain times they can be better visualized so that a karyotype can be made. When a cell is not actively dividing, the...

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• Science
The train is slowing down. If the train was in uniform motion, then the coin would continue moving with the same speed as the train, and both passenger and coin would move the same distance in...

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• Science
The roasted coffee bean contains both soluble and insoluble components. You've most likely noticed that when you make coffee, some of the compounds from the ground coffee end up in the water,...

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• Science
`KNO_3 + H_2 SO_4 ---gt KHSO_4 + HNO_3` This is double displacement reaction. In this type of reaction, elements from two compounds displace each other to form new compounds i.e. one of the...

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• Science
You have 3 substances that are all white solids, ammonium chloride (NH4Cl), sodium chloride (NaCl), and magnesium carbonate (MgCO3). First of all, the sodium chloride and ammonium chloride are...

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• Science
Epithelium lines surfaces and cavities, such as the mouth, throughout the body. Cheek cells consist of a specific type of epithelium: stratified squamous epithelium. Epithelial tissues are named...

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• Science
According to the first article I have attached, the noncoding sections are what ARE important in DNA fingerprinting. DNA is extremely long; the number of base pairs on the chromosomes of humans is...

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• Science
Cell growth is due to the addition of more cells. Cell development involves changes to that cell. The statement in your question is backwards. The growth and development of a cell does not affect...

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• Science
Please refer to the attached illustrations for clarity. Haploid means a cell with single chromosome and diploid means a cell with paired chromosomes. Meiosis results in four haploid daughter cells....

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• Science
Significant figures are the digits in a measurement or calculation that show the degree of precision. Here are the rules for determining how many significant figures are in a measurement: 1. All...

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• Science
Nitrous oxide has the chemical formula N2O and is composed of two atoms of nitrogen and one atom of oxygen. It is a greenhouse gas but is only very sparingly present in the Earth's atmosphere. It...

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• Science
Hello! The images are equal. The only difference is what we have to do to view it completely. If mirror is large enough, we can see the entire image from one position. If mirror becomes smaller,...

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• Science
To be classified as a mineral, a material must possess the following characteristics: Natural occurrence: it must occur naturally and hence should not be man-made. Crystalline solid substance:...

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• Science
You didn't include your observations, but I can address what usually occurs in these two chemical reactions. Penny in vinegar: Since you mentioned Zinc, you must have scraped away some of the...

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• Science
This is a conductivity appartus that indicates electricity is flowing through the material containing the electrodes if the bulb lights up when the switch is closed. The bulb won't glow when the...

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