The answer is isotonic solution. These are solutions where the solute concentration in the solution and inside the cells are levelled and consequently water flows consistently. When red blood cells are positioned in an isotonic solution the cells would always stay the same.
How many moles of potassium are in 117.3 g?
The number of moles of potassium is [tex]\boxed{{\text{3 mol}}}[/tex].
Further Explanation:
Mole is the S.I. unit. The number of moles is calculated as the ratio of mass of the compound to that of molar mass of the compound.
Molar mass also known as molecular weight is the sum of the total mass in grams of all the atoms that make up a mole of a particular molecule that is the mass of 1 mole of a compound. Its S.I unit is g/mol.
The expression to relate number of moles, mass and molar mass of compound is as follows:
[tex]{\text{Number of moles}}=\dfrac{{{\text{mass of the compound}}}}{{{\text{molar mass of the compound}}}}[/tex]
The formula to calculate number of moles of potassium is as follows:
[tex]{\text{Number of moles of potassium}}=\dfrac{{{\text{Given mass of potassium}}}}{{{\text{molar mass of potassium}}}}[/tex] ......(1)
The given mass of potassium is 117.3 g.
Molar mass of potassium is 39.0983 g/mol.
Substitute 117.3 g for given mass of potassium and 39.0983 g/mol for molar mass of potassium in equation (1) to calculate the number of moles of potassium.
[tex]\begin{aligned}{\text{Number of moles of potassium}}&=\frac{{{\text{117}}{\text{.3 g}}}}{{{\text{39}}{\text{.0983 g/mol}}}}\\&= {\text{3}}{\text{.0001 mol}}\\&\approx{\text{3}}\;{\text{mol}}\\\end{aligned}[/tex]
Hence, the number of moles of potassium in 117.3 g is 3 mol.
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Answer details:
Grade: High School
Subject: Chemistry
Chapter: Mole concept
Keywords: Potassium, number of moles, molar mass, compound, ratio, mass, 117.3 grams, 39.0983 g/mol, 3.0001 mol, and 3 mol.
Who first used the word "atomos" to describe the smallest unit of a substance? thomson democritus bohr schrödinger?
Answer: The correct answer is Democritus.
Explanation:
Democritus was a Greek philosopher and is still remembered for his contribution towards the atomic structure of the universe. He first described the smallest unit of a substance and named it as "atomos".
Thomson gave plum pudding model describing that electrons are surrounded by a soup of positive charge and to balance this positive charge, negatively charged electrons are present, as there are plums in pudding.
Bohr gave the planetary motion of an atom where electrons are the planets that revolve around the nucleus considered as Sun.
Schrodinger gave the quantum mechanical model of an atom.
Hence, the correct answer is Democritus.
According to einstein's equation, if 1 kg of mass "disappears" during a reaction then ____
If 1 kg of mass disappeared, this only means that all of those mass was converted to energy. We can actually compute for the energy using the formula:
E = m c^2
where m is mass and c is speed of light:
E = 1 kg * (3 x 10^8 m/s^2)2
E = 9 x 10^16 J
Answer:
3 x 10^8 J of energy is produced
a p e x verified
The ability of a material to be pounded into thin sheets is called what
Malleability is the ability of a material to be pounded into thin sheets without breaking, as demonstrated in the process of papermaking.
Explanation:The ability of a material to be pounded into thin sheets is called malleability. This is a key characteristic of many metals, which allows them to deform under pressure without breaking or cracking. Malleability is demonstrated in the art of papermaking where materials such as the bark from the mulberry tree and hemp rags are pounded into a pulp and spread as sheets to dry, creating paper or parchment. Some materials, like rubber, exhibit plastic behavior, meaning they deform irreversibly and do not return to their original shape and size when the load is removed.
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FeCO3 → FeO + CO2 is what kind of reaction?
Double replacement
Decomposition
Synthesis
Single replacement
Because a water molecule has a negative end and a positive end, it displays_____?
Because a water molecule has a negative end and a positive end, it displays unequal electrons sharing which gives the water molecule a partial negative charge near its oxygen atom and a partial positive charge near its hydrogen atoms.
What are properties of water molecule ?Water is a fluid substance which has no taste, odor, or transparency, and it is composed of the oxygen atom that attracts electrons strongly than the nuclei of the hydrogen atoms.
The oxygen in water molecule is more electro negative than hydrogen which results in the development of a partial negative charge on the oxygen atom and a partial positive charge on the hydrogen atom.
Water shows cohesive property in which the attraction of molecules for other molecules is called as cohesion.
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If an isotope of an element has 27 neutrons and a mass number of 52 , how many electrons must it have?
Final answer:
In an isotope with 27 neutrons and a mass number of 52, the number of electrons must match the number of protons, which is calculated to be 25.
Explanation:
If an isotope of an element has 27 neutrons and a mass number of 52, how many electrons must it have? To determine the number of electrons in a neutral atom, first, we need to know the number of protons, as the number of protons equals the number of electrons in a neutral atom. The mass number of an atom is the sum of its protons and neutrons. Given the mass number is 52 and there are 27 neutrons, we can calculate the number of protons (and therefore electrons in a neutral atom) as follows:
Mass number = Number of protons + Number of neutrons52 = Number of protons + 27Number of protons = 52 - 27 = 25Therefore, an isotope with 27 neutrons and a mass number of 52 must have 25 electrons.
determine the final temperature of a 10-0-g aluminum block originally at 25.0°C if you apply 435 joules of energy to it
The final temperature of a 10.0 g aluminum block initially at 25.0°C after applying 435 joules of energy is c) 73.3°C. The change in temperature is found to be 48.3°C.
To determine the final temperature of a 10.0 g aluminum block originally at 25.0°C after applying 435 joules of energy to it, we can use the formula for heat transfer:
Q = mcΔT, where
Q is the heat added (435 J)m is the mass of the aluminum (10.0 g or 0.01 kg)c is the specific heat capacity of aluminum (900 J/kg∙K)ΔT is the change in temperatureFirst, rearrange the formula to solve for the change in temperature (ΔT):
ΔT = Q / (mc)
Substituting the known values:
ΔT = 435 J / (0.01 kg * 900 J/kg∙K) = 435 / 9 = 48.3°C
Since the initial temperature is 25.0°C, the final temperature will be:
Final temperature = Initial temperature + ΔT = 25.0°C + 48.3°C = 73.3°C
Therefore, the final temperature of the aluminum block is c) 73.3°C.
Complete Question:
Determine the final temp of a 10.0 g aluminum block originally at 25°C if you apply 435 J of energy to it. The specific heat of aluminum is 0.89 J/g°C.
a) 57.9°C
b) 64.3°C
c) 73.3°C
d) 83.2°C
Emotions are perceived exactly the same way by all people. Please select the best answer from the choices provided T F
Answer: The given statement is false.
Explanation:
Emotions are defined as feelings that arise due to an individual's present circumstances, situations, mood or behavior with other people etc.
Every individual has their own perspectives related to life or other things and hence they look at things according to their own point of views.
Therefore, we cannot say that emotions are perceived exactly the same way by all people. Hence, this statement is false.
Which of the following indicates a chemical change?
Question 7 options:
A.an exploding firecracker
B.a freezing ice cube
C.wood breaking into splinters
D.a wire conducting electricity
Answer: Option (A) is the correct answer.
Explanation:
Chemical changes are defined as the change which tend to show difference in chemical composition of a substance.
For example, toxicity, reactivity, combustion etc are all chemical properties.
A chemical change will always lead to the formation of a new compound and this change is irreversible in nature by any physical means.
When we explode a fire cracker then it is a chemical change.
On the other hand, a change which is unable to bring any difference in chemical composition of a substance is known as a physical change.
For example, change in shape, size, mass, volume etc are all physical properties.
Physical changes are reversible in nature.
Thus, we can conclude that out of the given options an exploding firecracker indicates a chemical change.
The molar volumes of solid and liquid lead at the normal melting temperature of lead are, respectively, 18.92 and 19.47 cm3. calculate the pressure
We use the formula:
ΔP = (ΔH / ΔV) ln(T2 / T1)
where,
ΔH = change in enthalpy from solid to liquid = 4810 J/mol
ΔV = change in volume from solid to liquid = 0.55 cm^3/mol
T2 = 620 K, T1 = 600 K
So,
ΔP = (4810 / 0.55) ln(620 / 600)
ΔP = 286.76 J/cm^3
or converting to atm:
ΔP = 2830 atm
Answer:
ΔP = (ΔH / ΔV) ln(T2 / T1)
Explanation:
Two atoms of a single element that differ in number of neutrons are said to represent two distinct ____________ of that element.
Final answer:
Two atoms of a single element with different numbers of neutrons are known as isotopes. These atoms have the same number of protons and electrons but differ in their mass number due to the variance in neutrons.
Explanation:
Two atoms of a single element that differ in the number of neutrons are said to represent two distinct isotopes of that element. Atoms that have the same number of protons but different numbers of neutrons within their nuclei are called isotopes. The atomic number (Z) of an isotope, which is the number of protons in the nucleus, remains unchanged; however, the mass number (A), which is the sum of the number of protons and neutrons, is different for each isotope.
For example, the element hydrogen has three isotopes: protium (¹H) with zero neutrons, deuterium (²H) with one neutron, and tritium (³H) with two neutrons. While isotopes have the same chemical properties and exhibit the same chemistry because they have the same number of protons and electrons, the number of neutrons affects their mass and often their nuclear properties.
at 20 degrees celsius, how much sodium chloride could be dissolved in 2L of water
In this exercise we are going to deal with the solubility of a solution in which the amount of diluted sodium is 718 g.
What is the definition of a solution?Solutions are homogeneous systems formed by mixing two or more substances. Solutions are made up of two components: the solute, which is the one that dissolves and is found in the smallest amount, and the solvent, which is the component in the largest amount and acts by dissolving the solute.
In this way we have that:
35.89g of NaCl dissolve in 100 g of water at 20 °C.Making the calculus we have:
[tex](35.89g / 100 mL) * (2000) = 718 g[/tex]
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How does the chemical formula for water influence its chemical properties?
The chemical formula is composed of hydrogen and oxygen where the two atoms are bonded through hydrogen bond type of bonding. In this pair, the oxygen is the more electronegative atom hence the electrons are more directed to it. Because of this, this creates electron polarity which affects the chemical property of water.
Final answer:
The chemical formula of H₂O results in a polar molecule with strong hydrogen bonds, which give water its unique properties like high heat capacity, solvent capabilities, and ice's lower density than liquid water.
Explanation:
The chemical formula of water, H₂O, influences its chemical properties due to the arrangement of its atoms and the polar nature of its molecules. Each water molecule consists of one oxygen atom bonded to two hydrogen atoms. The oxygen atom draws electrons closer than the hydrogen atoms, creating a molecule with a negative charge near the oxygen and a positive charge near the hydrogens, establishing a polar structure. This polarity leads to strong hydrogen bonding between water molecules, resulting in many of water’s unique properties, such as high surface tension, high boiling point, and its role as a universal solvent.
Chemical Structure and Properties of Water
Water's polarity and hydrogen bonds are essential for its ability to dissolve various substances, which makes it a key player in chemical reactions and in biological systems. Due to these characteristics, water can contribute to the stabilization of ecosystems and the regulation of climate. The structure of water molecules also accounts for the fact that ice is less dense than liquid water, which is why ice floats. These properties are all rooted in the molecular structure of water, dictated by its chemical formula, H₂O.
Question 2(Multiple Choice Worth 4 points) (01.01 MC) Dominic and Eva are using the same type of stopwatches to measure the time it takes for a chemical reaction to occur. They each use the same stopwatch to measure the time. These are their results: Person Trial 1 Dominic 78 seconds Eva 81 seconds Why are their results unreliable and can lead to a pseudoscientific claim? They did not repeat their tests multiple times. They used the same type of stopwatch. They did not change the reactants in their chemical reactions. Only one person should have collected the data.
Answer:
The correct answer will be option-they did not repeat their tests multiple times.
Explanation:
Pseudoscience or the false science is the scientific practice which is based on the belief system and has no supported evidences.
The pseudoscience facts cannot be verified with the scientific methods which includes the logical questions, hypothesis and results produces through the repeated experiment.
In the given question, Dominic and Eva performed experiments using same stopwatch to note the time of a chemical reaction but they recorded different time period for the same chemical reaction.
This could lead to discrepancies or errors in the results and formation of conclusion. So experiment must be repeated to avoid the errors which the experimental method lacked.
Thus, the selected option is the correct answer.
What is the chemical nature of q-sepharose that allows it to be used as an ion exchanger?
Final answer:
Q-Sepharose is an anion exchange resin composed of cross-linked agarose beads with positively charged functional groups that bind negatively charged molecules in a process known as ion exchange chromatography. This allows for the separation and purification of proteins based on their charge.
Explanation:
The chemical nature of Q-Sepharose which allows it to function as an ion exchanger is rooted in its composition. Q-Sepharose is a form of cross-linked agarose beads which have been chemically modified to carry positively charged functional groups, typically quaternary ammonium groups.
This anion exchange resin can capture and bind negatively charged molecules, such as certain proteins, through electrostatic interactions. When a mixture containing various ionic species is passed through a column containing Q-Sepharose, negatively charged species will bind to the positively charged groups on the Q-Sepharose, while other species will pass through.
During ion exchange chromatography, to elute (wash off) the bound molecules, the ionic strength of the elution buffer is typically increased. This is done by adding salts, which provide counter-ions that compete with the protein for binding to the resin, resulting in the release of the protein into the buffer. Hence, proteins bound through ion-ion interactions can be selectively detached and collected. The physical nature of Q-Sepharose—its high density of charged groups, chemical stability, and structural robustness—makes it suitable for repeated use in chromatography processes.
Explain the Law of Conservation of Mass in terms of the atoms and bonds in a chemical reaction.
The two main postulates that was given by Antoine Lavoisier are, oxygen play an important role in combustion and the other is mass of the reactant and product is conserved. Therefore, according to law of conservation of mass, the number and types of atoms remain same, only the bond changes between atoms.
What is law of conservation of mass?According to Law of conservation of mass, mass can neither be created nor be destroyed. Mass can only be transformed from one form to another. The law of conservation of mass was given by Antoine Lavoisier.
Every reaction in nature follow the law given by Antoine Lavoisier that is mass is always conserved. According to law of conservation of mass, the number and types of atoms remain same, only the bond changes between atoms.
Therefore, according to law of conservation of mass, the number and types of atoms remain same, only the bond changes between atoms.
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