The answer is D. I just had this question and got it wrong because the last guy that commented on this said B but it is D. An Mg atom donates one electron to each of the two Cl atoms.
Answer: D is the correct answer so the person above is and/or was correct.
Use the processes of desalinization ( obtaining drinking water from sea water) and electrolysis of water (using electricity to separate water into hydrogen and oxygen) to explain the difference between compounds and mixtures.
Firstly let's briefly explain the difference between compounds and mixtures. Compounds are substances composed of many of the same molecule. Pure water, therefore, is an example of a compound as it is repeated molecules of H20. Mixtures are when two or more compounds are grouped together in a substance but retain their discrete molecular forms. For example, salty water is a mixture of pure water molecules and salt molecules. Mixtures can be separated without breaking molecular bonds, however compounds cannot.
If we take desalinization of sea water (salt water) for example. Sea water contains water molecules and salt molecules in a mixture. Pure water can be separated from the salt by passing the sea water through a very fine mesh at high pressure. The mesh acts like a sieve and does not let the salt molecules pass through, trapping them on one side and leaving pure water on the other side. This is called a reverse osmosis filter and is an example of separating two constituent molecules (compounds) from a mixture.
Separating water molecules themselves into their constituent atoms/molecules, however, does require bonds to be broken. In water the hydrogen and oxygen atoms are covalently bonded together. In order to separate them we must break these bonds and the application of energy through the process of electrolysis can achieve this. The result yields hydrogen gas at one electrode and oxygen gas at the other.
Notably, separating mixtures or compounds into their constituents requires energy in some form.
What is the name of a solution whose concentration of solute is equal to the maximum concentration that is predicted from the solute’s solubility?
Saturated Hope its helps.
Its saturated i did it on edgen
What phase of Moon can be ONLY seen at night? ignore it if the subject is wrong. i cant find earth science or science at all!
The phase is Waning Crescent phase.
I think new moon but not 100% sure
A mixture of gas has a total pressure of 105 mmHg. If the mixture is 68% neon what is the partial pressure of the neon?
From ideal gas formula PV=nRT, we can conclude that the pressure is influenced by the number of moles of the gas. When the gas is mixed, partial pressure of a gas is determined by the total pressure and percentage of mol of the gas. A gas with higher percentage will result inhigher partial pressure.
So, the partial pressure of the neon would be:105 mmHg* 68%= 71.4mmHg
Which one of these is not example of intercellular communication? A.) hormone travels through the circulatory listen to deliver a signal. B.) A molecule of glucose is produced in a chloroplast. C.) A molecule stimulate a target cell via a receptor. D.) A signaling module diffuses through gap junction.
The answer to the question is B
Which statement most completely describes the role of a cell in a single-celled organism? A.) provides the chemical functioning on genetic material that enables life, growth, and reproduction. B.) it provides organism with nutrition and means of locomotion. C.) provides a boundary between organism and its environment. D.) provide the support structure that the organism lacks because it has no true skeleton.
The answer to this question is C
The correct answer is:
A.) provides the chemical functioning on genetic material that enables life, growth, and reproduction.
Hope this is correct because i did the test.
In the reaction C5H8 + __O2 → 8H2O + 5CO2, what coefficient should be placed in front of O2 to balance the reaction? 5
no coefficient is needed
it is actually nine
Which of these changes most likely results in an increase in the volume of a gas? Decreasing the pressure on the gas? Cooling the gas? Removing some of the gas form the sample?
Know the ideal gas law equation?
PV = nRT
If you decrease P while keeping everything else constant, V increases. They are inversely related.
P = 1/V
The first answer is correct.
Decreasing the pressure on the gas.
Which statement best describes the movement of atoms in a solid? They are able to slide past each other. They spread apart as far as possible. They have no freedom to move. They are free to move in all directions.
The answer is: They have no freedom to move.
However is not completely true, as even in a solid atoms still a move a bit (vibrations).
If atoms were able to slide past each other, then we would have a liquid not a solid. Liquids "flow" but never really "break apart" this is because atoms are sliding between them, think of these as a bucket of marbles rolling down a slope.
If they are free to move in all directions, then you have a gas; that's why someone uses perfume in a room, eventually everyone smells it.
they have no freedom to move
The cycle in which water is changed and distributed to other areas is called a.
none of the above
Answer: a. water cycle
A water cycle can be define as the cycle of water in which water in various states like solid, liquid and gaseous forms circulates in different spheres of the earth. It describes how water evaporates from the surface of earth, the water vapors accumulate in the atmosphere, these water vapors become cool and condense in the form of rain or other kind of precipitations. The water cycle plays an important role in changing the weather condition of a region.
its describing evaperation but evaperation is in the water cycle so its water cycle.
When 90 g of water is split by electrolysis (2H2O → 2H2 +O2) at STP, how many liters of oxygen gas will be collected? Question 6 options:
56 L of
To solve this question the first step will be to verify that the chemical equation is balanced. As this equation is balanced we can proceed with the following steps:
1) To get the liter of oxygen gas to be collected we can employ the formula: pV=nRT where:
a) p= Pressure (1 atm at STP (Standard Preassure and Temperature)
b)V= volume (in litters)
c) n= number of moles
d) R= The gas constant that for STP conditions is 0.082 L atm mol K
e) T=temperature (273.5 K for STP conditions)
From this formula we can get the number of litters by: V=
To calculate the number of moles we have that 2 moles of equal on mole of . From the question we have that 90 grams o water are used for this reaction. To pass from grams to moles we can use the molecular weight, which for water is 18. Therefore,
The number of moles of water= 90grams x( = 5 moles of . We know that 2 moles of water equal one mole of oxygen gas, for this, 5 moles of water equal 2.5 moles of oxygen gas.
With the number of moles of oxygen gas calculated, we can substitute all the elements in the formula of the ideal gas to obtain the number of liters:
V = ; therefore,
V= 56.0 L of
2H2O -> 2H2 + O2
2 : 2 : 1
2 : 1
Mass of 1 mol of H2O = [(2 x 1) + 16] g = 18g
18g of H2O = 1 mol of H2O
90g of H2O = 90g x 1 mol / 18g
= 5 mol of H2O
2 mol of H2O : 1 mol of O2
5 mol of H2O : 5/2 mol of O2
1 mol of O2 = 22.4 L of O2
5/2 mol of O2 = 5/2 mol x 22.4 L / 1 mol
= 56 L of O2
Find the density of an object with a volume of 2.5 cm3 and a mass of 8.0 g.
Density = mass/ volume
= 8 / 2.5
= 3.2 g cm^-3
A cubic meter is about the same as the volume occupied by a _____. basketball arena kilogram of water washing machine cup of milk
washing machine, hopefully this helps
just took test
What is the SI base unit of temperature? Celsius kelvin coulomb Fahrenheit
Temperature of the gas is defined as the degree of hotness or coldness of a body. It is expressed in units like and
These units of temperature are inter convertible.
As we know that there are seven fundamental SI units which are used to fine derived units . They are listed as:
1). Mass - Kilogram
2). Length - meter
3). Time - Seconds
4). Electric Current - Ampere
5). Amount of substance - Moles
6). Intensity of light - Candela
7). Temperature - Kelvin
Thus SI base unit of temperature is Kelvin.
Kelvin is the SI unit of temprature
Describe the difference between a polar and a nonpolar covalent bond. give and explain an example of each type of bond.
In polar covalent bond two different type of electrons share electrons but in non polar covalent bond two same type of atoms share equal number of electrons
examples of non polar covalent bonds are cl2,n2,o2
examples of polar covalent bond iswter molecule H2O
A soft drink contains 11.5% sucrose (c12h22o11) by mass. how much sucrose, in grams, is contained in 355 ml (12 oz) of the soft drink? (assume a density of 1.04 g/ml.)
In chemistry concentration is equal to mass of the substance divided by volume. Therefore mass is equal to concentration multiplied by voiume
in a soft drink that contain 11.5% of sucrose by mass s therefore
369.2g x 11.5/100=42.46g
If someone you know is very sensitive to acid foods, which foods would you recommend he or she avoid?
Most fruits, like oranges, lemons, limes, etc. contain citric Acid. So...tell them to stay away from that stuff.
I believe milk contains lactic Acid, I.e. lactose/lactate. That could probably be avoided. (Although, the amount may not be high enough to be relevant)
There’s no telling how many other foods contain Acid.
How many s electrons does Ca+ possess?
Atomic number of calcium is 20 and its electronic distribution is 2, 8, 8, 2. When an atom has a positive charge then it means the atom has lost some electrons.
And, if an atom has a negative charge then it means an atom has gained some electrons.
For example, has one positive charge which means one electron has been lost by the calcium atom.
Hence, total number of electrons present in are 19 and its electronic configuration will be .
Thus, we can conclude that there are 7 s electrons present in .
The electron configuration of Ca is
1s2 2s2 2p6 3s2 3p6 4s2
So, since Ca+ has a positive charge, we know it has one less electron. Therefore the electron configuration is
1s2 2s2 2p6 3s2 3p6 4s1
You can take it from there. Just count the numbers next to each s and add them up
Which term is used to describe microorganisms that break down dead organisms so that they can be recycled into the environment? A. phytoplankton B. producers C. consumers D. decomposers 40 POINTS
From the knowledge I have left of biology, I have to go with D. Decomposers
Hope this helps!
Which of these are a force momentum or friction
Well I had to Google this one because I really was not sure.. so, if I am right.. it should be friction