Explain how the structure of lipids determines the polarity of the molecule
Final answer:
The polarity of a lipid molecule is influenced by its structure with a hydrophilic polar head and hydrophobic nonpolar tails, making it amphipathic, which explains its behavior in aqueous environments.
Explanation:
The polarity of lipid molecules is determined by their structure, which includes both polar and nonpolar parts. A typical phospholipid molecule has a polar phosphate head that is hydrophilic, meaning it is attracted to water, and nonpolar fatty acid tails that are hydrophobic, meaning they repel water and prefer to not be in contact with it. Phospholipids are amphipathic because they have these dual characteristics. Unsaturated fatty acids in the tails can create kinks that contribute to the fluidity and function. In water, phospholipids tend to arrange themselves into various structures like micelles, liposomes, or bilayers, with hydrophilic heads facing water and hydrophobic tails hidden away.
What effect does the presence of an impurity have on the freezing point of a liquid?
Scientific laws explain_____. why a pattern in nature occurs how a pattern in nature occurs a pattern in nature observed over and over strong evidence in support of a hypothesis
Answer: a pattern in nature observed over and over
Explanation:
Scientific law is the statement(s) which describes or helps in the predicting the natural phenomena. The information in the scientific law is valid and it is verified by the experimental procedures and observations. It can be used to explain the cause of a natural phenomena, conditions responsible for natural phenomena, occurrence of the natural phenomena, also gives information why a natural phenomena repeat itself over and over again.
He ionic compound magnesium chloride has ____________ chloride ions for every one magnesium ion.
Answer:
2
Explanation:
What is the law of conservation of mass and how is it related to the results of a chemical reaction?
A solution contains the ions ag+ , pb2+ and ni2+. dilute solutions of nacl, na2so4 and na2s are available to separate the positive ions from each other. in order to effect separation, the solutions must be added in which order?
Answer:
Sequence will be:
NaCl
Na₂SO₄
Na₂S
Explanation:
The silver ions get precipitated on addition of chloride ion as silver chloride.
So we will add NaCl in the first step.
The following reaction will occur.
[tex]Ag^{+}+Cl^{-}--->AgCl(s)[/tex]
Lead and nickel are soluble in sodium chloride (lead chloride and nickel chloride).
[tex]Pb^{+2}[/tex] will get precipitated as lead sulfate and nickel will remain soluble as nickel sulphate is soluble in water.
The reaction will be:
[tex]Pb^{+2}+2SO_{4}^{-2}--->PbSO_{4}(s)[/tex]
Then nickel will be precipitated as sulfide.
The reaction will be:
[tex]Ni^{+2}+2Cl^{-} ---->NiCl_{2}(s)[/tex]
An atom of copper (cu) has a mass number of 63 and an atomic number of 29. how many protons does it have?
Answer:
29
Explanation:
A piece of iron 12mm by 15mm has a mass of 3.6 grams. what is the thickness of the piece of iron, in mm, given that the density of iron is 7.8 g/cc. show you work below; include units; record your answer in scientific notation to 1 digit past the decimal
This is formed when an atom loses an electron to another atom.
Metals experience plastic deformation when _____.
Final answer:
Metals experience plastic deformation when stress is applied beyond their elastic limit. Unlike rubber-like materials, metals show a gradual decrease in stress with increasing strain, making them malleable and ductile.
Explanation:
Metals experience plastic deformation when stress is applied beyond their elastic limit. Plastic deformation is an irreversible change in the shape and size of a material, even when the load is removed. Unlike rubber-like materials that become more difficult to stretch and eventually break, metals show a gradual decrease in stress with increasing strain, making them malleable and ductile.
When stress is applied to a metal, the free-flowing electrons can slip between the stationary cations and prevent them from coming into contact. This allows the metal to deform without breaking and enables processes like hammering into shapes, rolling into thin sheets, or pulling into thin wires.
You are handed a sample of an unknown silicate mineral. which two elements must it contain?
An atom of magnesium has 12 protons and 12 electrons. if the atom loses 2 electrons, what will be the charge on the ion that forms? –10 +10 +2 –2
Answer:
The charge will be +2.
Explanation:
The atomic number of Mg is 12, so it has 12 protons.
The neutral atom of Mg has 12 electrons.
When an atom loses electrons it acquire positive charge.
The charge developed is equal to the number of electrons removed.
So the charge developed will be +2.
The equation will be:
[tex]Mg--->Mg^{+2}+2e[/tex]
A negative charge is developed when atom accepts electrons.
Which units represent density? Select all that apply. -cm³ -g/m³ -g/cm³ -cm³/gm -kg/L -kg/cm³ -mL/cm³
Answer:
[tex]Kg/cm^3[/tex]
[tex]g/cm^3[/tex]
[tex] Kg/L[/tex]
[tex]g/m^3[/tex]
Explanation:
We know that density is defined as the mass per unit volume
[tex]Density=\frac{Mass}{volume}[/tex]
When mass in gram and volume in cubic centimeter
Then units of density is[tex]g/cm^3[/tex]
When mass is given in Kg and volume given in litre then unit of density
[tex] Kg/L[/tex]
When mass is given in gram and volume in meter then units of density is given by [tex]g/m^3[/tex]
When mass is given in kilogram and volume is given in cubic centimeter
Then, units of density is given by [tex]Kg/cm^3[/tex]
How often do you need to make a fresh bleach solution?
Four elements make up about 96% of the mass of the human body. which are those four elements? (choose all that apply.) four elements
The four known elements that make up 96 percent of the mass of the human body are the following: Oxygen or O in the Periodic table, Carbon or C, Hydrogen or H, and Nitrogen or N in the periodic table. These are the 4 elements that makes up the body mass of an individual.
Answer the lab question (“what is the effect of temperature on the solubility of a solid in a liquid?”) with a hypothesis:
The hypothesis for solubility has been, "With the increase in temperature there has been an increase in solubility."
The solubility has been the extent of the dissolution of the solute in the solvent without being precipitated out. The solubility has been dependent on the bonding of solute molecules with the solvent.
The hypothesis for the effect of temperature on solubility has been:
With the increase in temperature, there has been an increase in solubility.
The research has been mediated with the acceptance of the hypothesis with the increased solubility as there have been more available solute molecules for dissolution with the solvent molecules.
Thus, the hypothesis for solubility has been, "With an increase in temperature there has been an increase in solubility."
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A cubic piece of metal measures 6.00 cm on each edge. If the metal is nickel, whose density is 8.90 g/cm3, what is the mass of the cube?
A cubic piece of metal measures 6.00 cm on each edge. If the metal is nickel, whose density is 8.90 g/cm3, then the mass of the cube would be 1922.4 grams.
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
By using the above formula for density
ρ = mass / volume
As given in the problem a cubic piece of metal measures 6.00 cm on each edge. If the metal is nickel, whose density is 8.90 g/cm³, then we have to find out the mass of the cube,
the edge of the cube = 6 centimeters
the volume of the cube = 6³ centimeter³
= 216 centimeter³
density = mass /volume
8.90 g/cm³=mass /216 cm³
mass of the cube = 216×8.90
mass of the cube = 1922.4 grams
Thus, the mass of the cube comes out to be 1922.4 grams
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Final answer:
To find the mass of the nickel cube, calculate the volume (216 cm³) and then multiply by the density of nickel (8.90 g/cm³), giving a mass of 1922.4 grams.
Explanation:
The student is asking about how to calculate the mass of a metal cube given the edge length and the density of the material, which in this case is nickel. To find the mass, you need to calculate the volume of the cube and then multiply by the density of nickel.
First, calculate the volume of the cube using the formula for the volume of a cube: V = edge length3. Here, the edge length is 6.00 cm, so V = 6.00 cm x 6.00 cm x 6.00 cm = 216.00 cm3.
Next, use the density of nickel which is 8.90 g/cm3 to find the mass: mass = density x volume. Substituting the values in gives you mass = 8.90 g/cm3 x 216.00 cm3 = 1922.4 grams.
The atomic mass of the atom is composed of the mass of _____. protons + electrons neutrons + electrons protons + neutrons just neutrons
Answer : The atomic mass of the atom is composed of the mass of protons + neutrons.
Explanation :
Atomic number : It is defined as the number of protons or number of electrons.
Atomic number = number of protons = number of electrons
Atomic mass : It is defined as the sum of number of protons and number of neutrons.
Atomic mass = Number of protons + Number of neutrons
For example : The sodium (Na) elements has atomic number 11. That means, the number of electrons and number of protons is equal to 11. The number of neutrons are 12. So, the atomic mass will be:
Atomic mass of Na = Number of protons + Number of neutrons
Atomic mass of Na = 11 + 12 = 23
Hence, the atomic mass of the atom is composed of the mass of protons + neutrons.
obtaining scientific data from a distance is called ?????
Answer;
-Remote sensing
Explanation;
-Remote sensing involves obtaining information about objects or areas from a distance, typically from aircraft or satellites.
-Remote sensors collect data by detecting the energy that is reflected from Earth. These sensors can be on satellites or mounted on aircraft.Remote sensing has a wide range of applications, such as coastal applications (monitoring shoreline changes), ocean applications to monitor ocean circulation and current systems, and hazard assessments among other applications.
Normal faults form ________stress, reverse faults form __________stress and strike-slip faults form___________stress.
The answers are ; tension, compression, and shear respectively
Normal faults are formed when the two crust are moving away from each other and the hanging wall block moves downwards due to gravity.
In reverse faults, the two crusts move towards each other hence producing compressional force. This causes the hanging wall block to move up with respect to the footwall block
In strike-slip faulting, the two crusts move across each other resulting in shear stress and causing a dip feature.
Normal faults are caused by tensional stress, reverse faults are formed by compressional stress, and strike-slip faults are formed by shear stress usually at divergent, convergent and transform boundaries respectively.
Explanation:Normal faults form due to tensional stress, which is when the crust is being pulled apart. This generally happens in divergent plate boundaries. On the other hand, reverse faults form due to compressional stress, where the crust is being pushed together, which generally occurs at convergent plate boundaries. The third category, strike-slip faults are formed because of shear stress, when different parts of the crust slide past each other in opposite directions, which usually occurs at transform boundaries.
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A urine sample has a mass of 147 g and a density of 1.010 g/ml. what is the volume of this sample?
Final answer:
To find the volume of a urine sample with a mass of 147 g and a density of 1.010 g/ml, divide the mass by the density. The volume is 145.54 ml.
Explanation:
The volume of the urine sample can be calculated using the formula:
Volume = Mass / Density
Given data:
Mass = 147 gDensity = 1.010 g/mlSubstitute the values and calculate:
Volume = 147 g / 1.010 g/ml = 145.54 ml
Therefore, the volume of the urine sample is 145.54 ml.
How are structures of ionic compounds fundamentally different then covalent compounds?
Which choice lists the correct order of the coefficients of each substance in the following neutralization reaction when the equation is balanced correctly? H2SO4 + LiOH → Li2SO4 + H2O 1, 1, 1, 1 2, 1, 2, 1 1, 2, 1, 2 1, 2, 1, 1
Answer : The order of the coefficients of each substance in the following neutralization reaction are, 1, 2, 1, 2
Explanation :
Balanced chemical reaction : It is defined as the chemical reaction in which the number of individual atoms of an element in reactant side always be equal to the number of individual atoms of an element in product side.
The given unbalanced reaction will be,
[tex]H_2SO_4+LiOH\rightarrow Li_2SO_4+H_2O[/tex]
In order to balance the chemical reaction, the coefficient 2 is put before the reactant [tex]LiOH[/tex] and product [tex]H_2O[/tex].
The balanced chemical reaction will be,
[tex]H_2SO_4+2LiOH\rightarrow Li_2SO_4+2H_2O[/tex]
By the stoichiometry we can say that, 1 moles of [tex]H_2SO_4[/tex] react with 2 moles of [tex]LiOH[/tex] to give 1 mole of [tex]Li_2SO_4[/tex] and 2 moles of [tex]H_2O[/tex] as a product.
Hence, the order of the coefficients of each substance in the following neutralization reaction are, 1, 2, 1, 2
Which of the following is not stage in the development of a thunderstorm
Answer:
updraft stage
Explanation:
To minimize the sharp ph shift that occurs when a strong acid is added to a solution
Is the process of bananas ripening a chemical change or a physical change? explain?
During chemical change and the chemical property ripen banana which involve in a different steps like change in color of peel from green to yellow then to brown, in second step change in taste become more sweeter as they begin to ripen.
What are the difference between chemical and physical property ?Chemical properties of the substance which can be measured when the substance undergoes chemical change where as the Physical properties of the substance include without involvement of any chemical change.
A chemical reaction conducted to show the chemical property where as for the determination of physical property of a substance no chemical reaction occur.
In Chemical properties the compounds are formed by chemical bonds while in Physical properties the compounds do not give any relationship.
chemical property used to detect how substances react while physical property used in identifying or describing the substance.
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Why does an increase in reaction temperature generally increase the reaction rate?
Pablo drove 260 miles using 12 gallons of gas. at this rate, how many gallons of gas would he need to drive 286 miles?
Write the full ground state electron configuration of co3+ in abbreviated form
An atom has 16 protons and 17 neutrons. What is the chemical symbol for the atom? Consult the periodic table.
Question 8 options:
A.33Cl
B.32S
C.33S
D.32Cl
The answer is C.33S. I had this question as well. Hope this helps you :)
The symbol of a chemical element whose atom has 16 protons and 17 neutrons is 33S. Thus, the correct option for this question is C.
What are Protons?Protons may be defined as the type of sub-atomic particles that are significantly present in the nucleus of an atom along with neutrons. Protons are positively charged in nature. It might be thought that protons are discovered by Ernest Rutherford.
If an atom has 16 protons, it means that it has an atomic number of 16. According to the periodic table, the atomic number 16 is occupied by the sulfur element. While chlorine elements have an atomic number of 17.
Now, the atomic mass is equal to the number of protons plus the number of neutrons. So, atomic mass = 16 + 17 = 33.
Therefore, the symbol of a chemical element whose atom has 16 protons and 17 neutrons is 33S. Thus, the correct option for this question is C.
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