If a mixture of quartz and bauxite contains 78% of quartz this means
There are 78gm of quartz in 100 gm of mixture/
There are 78gm of quartz for every 22 gm of bauxite.
There are 117gm of quartz for every 150gm of mixture.
If there is 78% of quartz in mixture of quartz and bauxite then
78% of quartz in 100% of mixture
If we suppose we have 100gm of mixture
Then ,
78% of 100 gm = 78gm
i.e. we have 78gm of quartz in mixture
100gm = quartz+ bauxite
100gm +78gm + bauxite
100- 78 = bauxite
Therefore bauxite = 22gm
Thus in 100 gm of mixture there is 78 gm of quartz and 22gm of bauxite.
If we suppose we have 150gm of mixture
Then ,
78% of 150 gm = 117gm
i.e. we have 117gm of quartz in mixture
150gm = quartz+ bauxite
150gm = 117gm + bauxite
150- 117 = bauxite
Therefore bauxite = 33gm
Thus in 150 gm of mixture there is 117gm of quartz and 33gm of bauxite.
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Calculate the molarity of a 853.5 mg sample of KIO3 is dissolved in enough water to make 250.0 ml of solution.
The molarity of a solution of KIO3 is dissolved in enough water to make 250.0 ml of solution is 0.1595.
What is molarity?Molarity is the measure of the concentration of any solute per unit volume of the solution.
M = {n}{V}
The molar mass of KIO3 is 214.001
Given the mass is 853.5 mg
First, we calculate the number of moles
moles = mass / molar mass
853.5 / 214.001 = 3.988
Now, molarity can be calculated
The number of moles is 3.988
The volume is 250.0 ml
Putting the values in the formula
M = 3.988 / 250.0 = 0.1595
Thus, the molarity is 0.1595.
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You place 10.00 mL of water in a graduated cylinder and add a 15.0 g sample of iron to the water. The new water level is 11.91 mL. What is the density of the iron?
The density of the iron, given the data from the question is 7.85 g/mL
What is density?The density of a substance is simply defined as the mass of the subtance per unit volume of the substance. Mathematically, it can be expressed as
Density = mass / volume
How to determine the density of the ironThe following data were obtained from the question:
Volume of water = 10 mLVolume of wate + iron = 11.91Volume of 1ron = 11.91 - 10 = 1.91 mLMass of iron = 15 gDensity of iron =?The density of the iron can be obtained as follow:
Density = mass / volume
Density of iron = 15 / 1.91
Density of iron = 7.85 g/mL
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When two protons are extremely close to each other there is a strong __________ between them.
When two protons are extremely close to each other, there is a strong nuclear force between them.
The force between a proton and neutron is same as the force between two proton, which the nuclear force. Nuclear forces can also be called as the nuclear interactions. Nuclear forces affects the neutrons and protons, both nucleons in identical or similar way.
Strong nuclear force is one of the fundamental forces of the nature and it is strongest among the four. Four fundamental forces are -Gravitation, strong nuclear force, weak nuclear force, and electromagnetism.
The energy that is used in nuclear power and nuclear weapons, the nuclear force has an important role in storing it. To bring the charged protons together against their electric repulsion, energy is required. When the protons and neutrons are bound together by the nuclear force they form a nucleus, this energy is in stored form.
So, the strong forces holding two protons extremely close is strong nuclear forces.
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The anaerobic process of splitting glucose and forming two molecules of pyruvic acid.
The anaerobic process of splitting glucose and forming two molecules of pyruvic acid is called 'glycolysis.'
The word glycolysis means 'glucose splitting' and this is what happens throughout the process.
During glycolysis, enzymes are used to split one molecule of glucose into two molecules of pyruvate (pyruvic acid).
This process produces end products which include two molecules of ATP and two molecules of NADPH as well as water.
As this is an 'anaerobic process' which means it doesn't need oxygen for the process.
The process of glycolysis also takes place inside the cytoplasm and occurs in both aerobic and non-aerobic organisms.
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What states of matter do halogens exist in at room temperature?
At room temperature, the halogens show all the states of matter.
Halogens are the elements of the periodic table that belong to group number 17 and are non-metals. Fluorine and chlorine are gaseous at room temperature, bromine exists as liquid, whereas iodine and astatine are solid in nature. The halogens are highly electronegative and reactive in nature.
States of matter are the physical form in which a substance can exist. There are three states of matter: solid, liquid and gas. Fluorine and chlorine have weak forces of attraction between their molecules at room temperature, hence gaseous. Bromine has little stronger intermolecular force that prevents its evaporation and hence a liquid. The molecular weight of higher halogens is large with strong forces molecular forces and hence are solids.
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What mass of liquid mercury would fill a glass tube with a diameter of 16.0 mm to a height of 25.0 cm? the density of mercury is 13.53gcm3.
The mass of liquid mercury that can fill glass tube is 680.365 gm.
We know that ,
Volume of cylinder = π[tex]r^{2} h[/tex]
where r is the radius of cylinder and h is the height
Here diameter of glass tube is 16mm
Thus the radius r = 8 mm
= 0.8 cm
Volume of glass tube = π [tex]0.8^{2}[/tex][tex]*25[/tex] [tex]cm^{3}[/tex]
Density of mercury given is [tex]13.53gm/cm^{3}[/tex]
We know that
Density = Mass / Volume
∴ [tex]13.53gm/cm^{3}[/tex] = Mass/ π[tex]0.8*0.8 * 25[/tex]
Mass = 13.53 *π0.8*0.8*25
= 680.36 gm
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Describe how plants promote mechanical and chemical weathering but inhibit erosion
Plants promote mechanical and chemical weathering but inhibit erosion because of root
Plants can cause mechanical weathering their roots grow into rocks and crack them and when plants cause chemical weathering there roots release acid or other chemicals, onto rocks, which then forms cracks, and breaks apart. as plant roots take in nutrients, they remove elements from the minerals. This causes a chemical change in the rock but inhibit erosion because plants break up earthen materials as they take root, and can create cracks and crevices in rocks that's why they inhibit erosion
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An aluminum-containing compound has the formula mgxalyo4 and is 44. 98% oxygen by mass. What is the value of the subscripts x and y?.
The value of the subscripts x is 1 and y is 2.
ω(O) = 44.98% ÷ 100%
ω(O) = 0.4498; mass percentage of oxygen in the compound
M(compound) = 4 × 16 g/mol / 0.4498
M(compound) = 142.3 g/mol; molar mass of the compound
Oxidation number of oxygen atom in the compound is -2, for oxygen atoms total charge is -8.
Magnesium and aluminium must have total charge of +8 in the compound.
Magnesium has oxidation number +2.
Aluminium has oxidation number +3.
x is amount of magnesium atoms.
y is amount of aluminium atoms.
x × (+2) + y × (+3) = +8
x must be 1 and y must be 2.
M(compound) = M(Mg) + 2M(Al) + 4M(O)
M(compound) = 24.3 g/mol + 2×27 g/mol + 4×16 g/mol
M(compound) = 142.3 g/mol.
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How many grams of kmno4 correspond to 3.13 x 1022 formula units of kmno4? avogadro's number is 6.022 x 1023.
8.21g of KMnO₄ correspond to 3.13 x 10²² formula units of KMnO₄? avogadro' s number is 6.022 x 10²³
Here,3.13 x 10²² formula units of KMnO₄=1 mole of KMnO₄/avagadro no
1 mole of KMnO₄/6.022 x 10²³
= 3.13 x 10²²/6.022 x 10²³
= 5.197moles of KMnO₄
Now KMnO₄ has molar mass is 158.034g/mol
5.197moles of KMnO₄=158.034/1 mole of KMnO₄
158.034×5.197=821.1g of KMnO₄
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Earth is made mostly of metals and rocks. where did the elements (carbon, silicon, iron, etc.) that make up these materials form?
Earth is made mostly of metals and rocks. the elements (carbon, silicon, iron, etc.) that make up these materials form, and they were produced by nuclear fusion in stars.
Metals are materials that, when freshly worked, polished, or crushed, have a lustrous appearance and are relatively good conductors of electricity and heat. Metals are typically ductile and malleable. These properties are the result of metallic bonding between the atoms or molecules of the metal.
Metal is very useful material. Metals have many properties such as B. Strength, toughness, and stiffness. When heated, the metal can be shaped into anything from tiny paper clips to giant airplanes. It is also an excellent conductor of electricity and heat, making it useful for electricity and cooking pots.
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The main function of a(n)______ is to help an interaction between two chemicals to occur, changing both chemicals.
The main function of a vitamin is to help interaction between two chemicals to occur, changing both chemicals.
In toxicology, synergism refers to the effect caused when exposure to two or more chemicals at one time results in health effects that are greater than the sum of the effects of the individual chemicals.
What are vitamins?
nutrients may be described as a special elegance of micronutrients that must be received from the food regimen for you to maintain frame homeostasis, which can be liposoluble or hydro soluble.nutrients are natural molecules which can be required for the proper functioning of the frame and the development of organisms.There are thirteen vitamins in people, of which 9 are water soluble and four (A, D, E, okay) are fats soluble.Therefore, the main function of a vitamin is to help interaction between two chemicals to occur, changing both chemicals.
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Describe the energy inputs and outputs of a bonfire.
Answer:
The logs are the input and the flames are the output
Explanation
When placed inside of a magnetic field, nmr active nuclei act in what way? (1 pt)
When placed inside of a magnetic field, the magnetic field that electrons generate aligns in the opposite direction of the applied magnetic field.
Magnetic fields are used in all modern technology, especially in electrical engineering and electromechanics. Rotating magnetic fields are used in both electric motors and generators. Magnetic field interactions in electrical devices such as transformers are conceptualized and studied as magnetic circuits. Magnetic forces use the Hall effect to provide information about charge carriers within a material.
The Earth creates its own magnetic field, which protects the Earth's ozone layer from the solar wind and is important for navigating with a compass. Magnetism is a class of physical properties imparted by magnetic fields and refers to the ability to induce attractive and repulsive phenomena in other entities.
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Apply to explain why a hydrogen atom can become either an ion or a part of a molecule.
Yes, it can be used for either an ion or a part of a molecule.
What is ion?Ions are any atom or molecule having a net electrical charge. A proton's charge, which is generally believed to be positive, is equal to and opposite to the charge of an electron, which is supposed to be negative. It has the ability to either gain or lose one electron, allowing it to change into an ion. It can join a molecule because it can form covalent bonds with other atoms to finish a full valence shell.
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A hydrogen atom can become either an ion or a part of a molecule. It can become an ion because it can lose or gain an electron. It can become an element of a molecule because it can form covalent bonds with other atoms to gain a full valence shell.
What is ion?Ions are any atom or molecule having a net electrical charge. A proton's charge, which is usually believed to be positive, is adequate to and opposite to the charge of an electron, which is meant to be negative.
It has the ability to either gain or lose one electron, allowing it to vary into an ion. It can join a molecule because it can form covalent bonds with other atoms to end a full valence shell.
Why do two hydrogen atoms combine to make a molecule?
Hydrogen has number 1. So it's one electron and 1 proton. So to finish it's octet it need one more electron. So, to become stable it forms hydrogen molecule by sharing it's electron with another H atom and thus forms a chemical bond .
Is hydrogen an ion or neutral atom?
Hydrogen is that the smallest chemical element. it's one proton and one electron, making it neutral. However, the ions of atom are charged species.
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Spontaneous movement of molecules and ions from an area of high concentration to an area of low concentration. True or false?.
Spontaneous movement of molecules and ions from an area of high concentration to an area of low concentration is true.
There are two examples of spontaneous movement: diffusion and osmosis.
Diffusion is spontaneous movement of molecules and ions from an area of high concentration to an area of low concentration.
Osmosis is the spontaneous movement of solvent molecules (in this example water) through a selectively permeable membrane into a region of higher solute concentration (15 percent salt solution), in the direction that tends to equalize the solute concentrations on the two sides.
The direction of osmotic pressure is always from the side with the lower concentration of solute to the side with the higher concentration.
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What type of bonds occurs between neighboring amino acids in a secondary structure in creating alpha helices and beta pleats?.
Hydrogen bonds occur between neighboring amino acids in a secondary structure in creating alpha helices and beta pleats.
Hydrogen bond is an electrostatic attraction between two polar groups that occurs when a hydrogen atom (H), covalently bound to a highly electronegative atom such as flourine (F), oxygen (O) and nitrogen (N) atoms.
Protein is composed of amino acid linked with peptide bond, secundary structure can be α-helices and beta pleated sheet.
In a beta-pleated sheet, hydrogen bonds are formed between carbonyl and amino groups of backbone.
Fluorine atom has greater electronegativity than oxygen atom in carbony group, so the hydrogen bond with hydrogen atom is shorter and strands are closer.
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When phosphate is added to adp to form the energy-storing molecule atp, this is known as ________ and, since water is also produced, this reaction is also considered a ________ reaction.
When phosphate is added to ADP to form the energy-storing molecule ATP, this is often often known as phosphorylation and, since water is additionally produced, this reaction is additionally considered a condensation reaction.
What are phosphorylation and condensation?
Phosphorylation could also be a condensation reaction that is important for the functioning of sugars, lipids, and proteins and is critical when it involves regulating the function of enzymes. one among the simplest phosphorylation reactions in nature is the phosphorylation of glucose which is the first step in glycolysis.
What happens when a phosphate molecule is added to ADP?
When the cell has extra energy (gained from breaking down food that has been consumed or, within the case of plants, made via photosynthesis), it stores that energy by reattaching a free phosphate molecule to ADP, turning it back to ATP. The ATP molecule is simply like a rechargeable battery.
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how do metals and nonmetals react with acid
Answer:
Metals react with acids to form hydrogen gas with a pop sound and non metals do not react with acids. This is because a substance undergoing react with acids, donates electrons to the H+ ions produced by the acids. But non metals acceptor of electrons and hence they do not donate to the hydrogen ion of the acid. As a result they don't react with dilute acid but there are some exceptions.
The first location of chemical and mechanical digestion is the stomach. true/ false
The first location of chemical and mechanical digestion is the stomach. This statement is false.
Digestion is the breaking down of large insoluble food molecules into smaller water-soluble food molecules so that they can be absorbed into the aqueous plasma. In certain organisms, these small substances are absorbed from the small intestine into the bloodstream. Digestion is important for breaking down food into nutrients that the body uses for energy, growth, and cell repair that it needs to survive.
The digestive system has many forms. A basic distinction is made between internal and external digestion. External digestion evolved early in evolutionary history, and most fungi still rely on it. During this process, enzymes are secreted into the organism's environment, where organic substances are decomposed and some of the products diffuse back into the organism. Animals have a tube (alimentary canal) where internal digestion takes place. This is more efficient as more decomposition products can be trapped and the internal chemical environment can be more effectively controlled.
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Scientific knowledge results from the interaction of scientists who are investigating natural phenomena. Which of these BEST describes how a scientific explanation becomes widely accepted?
Group of answer choices
DNA is not necessary for an organism to reproduce.
Organisms create their own DNA sequence that is not like their parents.
. DNA contains genes that hold specific traits for an organism.
A. DNA is an exact copy from parent to offspring
The correct answer is option a) A hypothesis is tested repeatedly and the results are confirmed and debated by the scientific community.
Scientific knowledge is the knowledge that has been acquired and tested using the scientific method. Scientific knowledge may also comprise the observation and classification of facts to establish verifiable knowledge gained through induction and hypothesis.
A hypothesis is a proposed explanation for an event that can be tested. Hypotheses, or tentative explanations, are typically generated within the context of a scientific theory. A widely accepted, rigorously investigated and verified explanation for a collection of observations or a phenomenon is what is known as a scientific theory. The basis of all scientific knowledge is a scientific theory.
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Scientific knowledge results from the interaction of scientists who are investigating natural phenomena. Which of these BEST describes how a scientific explanation becomes widely accepted?
a) A hypothesis is tested repeatedly and the results are confirmed and debated by the scientific community.
b) It is debated by the scientific community.
c) A hypothesis is tested repeatedly and the results of the tests are debated.
d) A hypothesis is tested repeatedly and the results are mostly supported by scientific investigations.
An ideal gas contained in 5.0 liter chamber at a temperature of 37°C. If
the gas exerts a pressure of 2.0 atm on the walls of the chamber, which of
the following expressions is equal to the number of moles of the gas?
a.
(2.0)(5.0)
(2.0) (310)
b. (2.0)(0.0821)
(5.0) (37)
c.
(2.0) (0.0821)
(5.0) (310)
d.
(0.0821) (37)
(0.0821)(5.0)
e.
(2.0)(5.0)
(0.0821) (310)
Answer:
earning
Explanation:
yeah its ok
How many protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200
The number of protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200 is 79, 79 and 121 respectively.
What is atomic number?Atomic number of an element is the number of protons in an atom of the element while the atomic mass is the sum of the protons and neutrons in the atom.
The electron number is equal to the number of protons in a neutral atom.
According to this question, the isotope of an element has an atomic number of 79 and a mass number of 200.
Number of protons = 79Number of electrons = 79Number of neutrons = (200 - 79) = 121Therefore, the number of protons, electrons and neutrons are in an isotope of the element with an atomic number of 79 and a mass number of 200 is 79, 79 and 121 respectively.
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You are heating a piece of glass and now want to pick it up. you should?
Answer:
pick it up with tongs
Explanation:
Conclude Each
year,
the American Chemical
Society holds a national meeting and many
regional meetings for chemists. Reports of
these meetings are then circulated all over
the world Why do you think this has become
standard practice?
Someone please help
This has become common practice, in my opinion, since scientists need to exchange ideas.
I think this has become standard practice because scientists need to share their ideas.Generally, most scientists don't work individually. They cooperate and work in teams. In contrast, a team is more effective than a single person in solving a scientific puzzle.Additionally, when they discuss the meeting reports, it facilitates their ability to agree on the concepts presented.. Every idea is questioned. This accurate evaluation guarantees that scientific knowledge is solidly supported.Also, scientists have to be aware of the latest researches and ideas in their field.To learn more about American chemical society visit:
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A vacuum gage connected to a chamber reads 35 kpa at a location where the atmospheric pressure is 92 kpa. determine the absolute pressure in the chamber and express it in pa, kpa, bar and psi
Vacuum gage connected to a chamber reads 35 kpa at a location where the atmospheric pressure is 92 kpa then the absolute pressure in the chamber and express is 57kpa
Gauge pressure is the pressure relative to atmospheric pressure. Gauge pressure is positive for pressures above atmospheric pressure, and negative for pressures and absolute pressure is the sum of gauge pressure and atmospheric pressure
Here to find absolute pressure atmospheric pressure=92kpa and vacuum gage=35 kpa
Pabsolute pressure=Patmospehric pressure - Pvaccume
92-35=57kpa
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After teaching a group of students about fats and biotransformation, the instructor determines that the teaching was successful when the students identify what as the storage location of bile acids?
The storage location of bile acids is the gall bladder.
Bile acids are made from cholesterol in the liver. Cholic acid and chenodeoxycholic acid are the major bile acids.
These acids are very crucial for the digestion of dietary fats and fat-soluble vitamins(A, D, E, and K).
The bile that is secreted by the liver passes through the hepatic ducts and is stored and concentrated in a thin muscular sac called the gall bladder. The bile then reaches the small intestine where it acts upon the food and helps in its digestion.
Therefore, the instructor determines that the teaching was successful when the students identify the gall bladder as the storage location of bile acids.
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A student in chm 11500 lab measured a 10. 00-ml sample of deionized water into a pre-weighed erlenmeyer flask using a 50-ml buret and recorded the mass as 9. 95 g. The temperature of the sample was 24 °c. The percent error in the volume measurement was __________________.
The percent error in the volume measurement was 0.238 %.
d(water) = 0.99738 g/ml; density of the water at 24°C
V(water) = 10.00 m; volume of the water sample
m(water) = d(water) × V(water)
m(water) = 0.99738 g/ml × 10.00 ml
m(water) = 9.9738 g; mass of the water sample
error = (9.9738 g - 9.95 g) ÷ 9.9738 g · 100%
error = 0.238 %
The percent error is an error between an observed value and the true value of a measurement.
In this problem, an observed value is 9.95 grams and the true value of a measurement is 9.9738 grams.
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chlorhexidine and alexidine are: group of answer choices used to treat local hypoplasia. used widely in metallic salts. used in mouthrinses and are effective against plaque formation. chemicals present in metallic dust, which industrial workers may inhale. used in prophylaxis jets.
Chlorhexidine and alexidine are: used in mouthrinses and are effective against plaque formation.
Chlorhexidine is a disinfectant and antiseptic. It is used for preventing dental plaque, treating yeast infections of the mouth and cleaning wounds.
Chlorhexidine interacts with components of toothpaste and forms salts of low solubility and antibacterial activity.
Alexidine is an antimicrobial agent, used in mouth washes as antiplaque cleaner. It is better for use than chlorhexidine because it is relatively non-toxic
Chlorhexidine and alexidine were synthesized in 1950s.
They inhibit a dental plaque formation by 70%.
Dental plaque is a biofilm of microorganisms that grows in the mouth.
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What is the atomic number for an element whose mass number is 78, which contains 36 neutrons per atom?
Describe what matter is and give three characteristics.
Matter is anything that has mass and occupies space.
Characteristics:
1. Volume
2. Density
3. Compressibility
