The volume occupied by a 22.2 g sample of gold having a density of 0.01932 kg/cm3.
As we know that the density of a given substance is :
Density = mass/volume
Now to find the volume, reshuffle the formula:
volume = mass/ density
Now,
density = 0.01932 kg/cm3
mass = 22.2g = 0.0222 kg
Putting the values,
volume = 0.01932/0.0222
volume = 1.49 cm3
The volume is 1.49 cm3.
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An isotope of sodium (na) has a mass number of 22. how many neutrons does it have?
An isotope of sodium (Na) has a mass number of 22 it have 11 neutrons
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. protons are the positively charged particles which are present in the nucleus of an atom. a neutron is a subatomic particle found in the nucleus of every atom except that of simple hydrogen. here sodium (Na) has a mass number of 22 so, in that sodium 11 proton are present and 11 neutron are present.
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If+a+mixture+of+quartz+and+bauxite+contains+78%+quartz,+this+means+that+_______.+(select+all+that+apply.)
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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Under certain conditions, excessive ____________ results in water depletion, which is called ____________ . a sign of water depletion is ____________ .
Under certain conditions, excessive Sweating results in water depletion, which is called Dehydration. A sign of water depletion is Weight Loss.
Dehydration means less intake of fluid such as water, juices etc or by losing more fluid than the amount of fluid you have taken. Fluid can be lost in the form of sweat, tears, urine, vomiting, or diarrhoea.
A dehydration reaction can be defined as the chemical reaction between any two compounds where one of the products is water. Dry mouth and tongue, no tears when crying, Sunken eyes and cheeks are some of the signs of dehydration.
Under certain conditions, excessive Sweating results in water depletion, which is called Dehydration. A sign of water depletion is Weight Loss.
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1. The motion of an object is described as 240 mph to the northeast. What form of
motion is being described?
a. Speed
b. Velocity
c. Acceleration
d. None of the above
The form of motion which is described is velocity as it is describing the speed as well as the direction.
What is motion?Motion is defined as a phenomenon which is described with respect to change in object's position with respect to time.It is given in terms of displacement,velocity,distance ,acceleration,speed.
Branch of physics which deals with motion of objects without any reference to it's cause is called kinematics while the branch which studies forces and their effects on motion is called as dynamics.
Motion applies to various systems like objects,bodies, matter particles ,radiation ,curvature.There are three laws of motion which are proposed by Newton.Classical mechanics is based on Newton's law of motion.Relativistic mechanics is based on modern kinematics.
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The molecular mass of glucose is 180 g. to make a 1m solution of glucose, you should _______.
The molecular mass of glucose is 180 g. To make 1 M solution of glucose , you should dissolve 1 mole of glucose in 1 litre of water.
The molecular mass of glucose is 180.16 g/mole, therefore 1 mole is 180.16 grams.
So, to make a 1 M solution, you should take 1 mole = 180.16 g of glucose and make up to 1 litre.
Working glucose solution is prepared by diluting the stock solution.
It can also be said that 1 M glucose solution is -
1 M glucose solution = 180 g / 1000 m L
= 0.18.
So, it is 0.18 % w/v.
Glucose solution is a mixture of glucose and water. It is used to treat low blood sugar and the water loss without the electrolyte loss. Glucose solution is an isosmotic solution. If it is in large amount, it produces hypertonic effects on the system.
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The empirical formula of a compound with molecules containing 12 carbon atoms, 14 hydrogen atoms, and 6 oxygen atoms is?
The empirical formula of a compound with molecules containing 12 carbon atoms, 14 hydrogen atoms, and 6 oxygen atoms is C₆H₇O₃.
The empirical formula gives the proportions of the elements present in a compound.
In this compound proportion od carbon, hydrogen and oxygen atoms is:
n(C) : n(H) : n(O) = 12 : 14 : 6 /÷2; in this example, molecular formula is divided by two
n(C) : n(H) : n(O) = 6 : 7 : 3
In the empirical formula, the proportion od carbon, hydrogen and oxygen atoms is 6 : 7 : 3, so the empirical formula is C₆H₇O₃.
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What is the actual order that information follows as it travels through a neuron?
Dendrites -> Soma -> Axon -> Terminal buttons
is the actual order that information follows as it travels through a neuron
What is neuron?Neurons are messengers of information. Between various brain regions and between the brain and the rest of the nervous system, information is transmitted using electrical impulses and chemical signals. Without the action of neurons and their supporting cells, the glial cells known as oligodendrocytes and astrocytes, humans would not be able to think, feel, or act.
A cell body, an axon, and two extensions called a dendrite make up the three basic components of a neuron. There is a nucleus inside the cell body that regulates the cell's functions and houses its genetic material. The axon, which resembles a long tail, delivers signals from the cell. Dendrites serve as the cell's messengers and resemble the tree's branches.
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A mixture of water (H2O) and ammonia (NH3):
Answer:
h20 + NH3
Explanation:
water plus ammonia gives or produces a weak qcid
Answer:
The answer is hydrogen bonding
Explanation:
One of the basic building blocks of matter, which cannot be broken down by chemical means is a(n)______ , of which there are 92 that occur naturally.
One of the basic building blocks of matter, which cannot be broken down by chemical means is an element.
The first chemical element is hydrogen (atomic number is 1) and the last is oganesson (atomic number is 118).
Elements are scheduled in Periodic table, ordered by their atomic number.
Other example, krypton is a chemical element with symbol Kr and atomic number 36.
Krypton has 36 electron and 36. It is noble gas (group 18).
Noble gases are in group 18: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe) and radon (Rn). They have very low chemical reactivity.
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A given short peptide, sgyal contains _________ peptide bonds. any given short peptides/protein contain at least _____ amino group(s) (nh3 ) and ______ carboxyl group(s) (-coo- ).
A given short peptide, SGYAL contains four peptide bonds. Any given short peptides/protein contain at least one amino group(s) (nh3 ) and one carboxyl group(s) (-coo- ).
SGYAL stands for secretaria general y asuntos legales. Sgyal is also written as Ser-Gly-Tyr-Ala-Leu . The structure of SGYAL is shown in the image attached. SGYAL contains four peptide bonds as highlighted by yellow color in the structure of SGYAL.
Peptide bond is formed by the condensation of carboxylic group of one molecule and amino group of other molecule. Any given short peptides/protein contain at least one amino group(s) ([tex]NH_{3}[/tex]) and one carboxyl group(s) ( -COO-).
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The general molecular formula for alkanes is cnh2n 2. what is the general molecular formula for cycloalkanes with two rings?
The general molecular formula for alkanes is cnh2n 2. The general molecular formula for cycloalkanes with two rings CnH2n−2.
Cycloalkanes are hydrocarbons with a ring type structure. The reason of ring formation is because they are saturated compounds. The general formula of the cycloalkanes is CnH2n where n is the number of carbon atoms.
cyclopentane, Cyclobutane, cyclohexane, and cycloheptane, cyclooctane are some example of cycloalkanes and Cyclopropane is considered one of the smallest cycloalkanes.
Cycloalkanes have a lot of uses. They are used in the medical industry for the production of drugs. These compounds are also used in hair and food industries.
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Determine the expected number of signals in the proton nmr spectrum for each given molecule.
The number of NMR signals represents the number of different types of protons in a molecule.
What is molecule?
A molecule is defined as a collection of two or more atoms held together by the attractive forces known as chemical bonds; depending on the context, the term may or may not include ions that fit this criteria.
The spectrum has five signals which indicate five types of different protons.
What does a type of proton mean?
Here type of proton means protons are grouped in types based on their environments.
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expression for calculating the charge of an ion
Answer:
Number of protons - number of electrons = charge on ion.
Explanation:
organized cells:tissues as organ system or organism
Explanation:
The body has levels of organization that build on each other. Cells make up tissues, tissues make up organs, and organs make up organ systems. The function of an organ system depends on the integrated activity of its organs. For instance, digestive system organs cooperate to process food.
Wherever it is found, water always contains oxygen and hydrogen in the mass ratio of 8 to 1. Taken by itself, this fact demonstrates what natural law?.
Natural law demonstrates constant composition wherever it is found, water always contains oxygen and hydrogen in the mass ratio of 8 to 1.
The above statement agreed by Law of constant proportions according to this law, a chemical compound always contains the same proportion of elements by mass. thus, irrespective of the source, or chemical compound always contains the element in a fixed ratio by mass for example, pure water obtained from river, sea, well always contains hydrogen and oxygen combined together in the ratio of 1:8 by mass that's why wherever it is found, water always contains oxygen and hydrogen in the mass ratio of 8 to 1. Taken by itself, this fact demonstrates constant proportions law demonstrates as natural law
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Through bonding, atoms are able to attain the same electron configuration as a(n)?
The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration
What is electron configuration?The placement of electrons in orbitals surrounding an atomic nucleus is known as electronic configuration, also known as electronic structure or electron configuration. As follows: 1s will be filled first, with a maximum of 2 electrons, followed by 2s, 2p, 3s, 3p, 4s, 3d, 4p, 5s, 4d, and 5p. The Aufbau Principle, the Pauli-Exclusion Principle, and Hund's Rule are a set of three guidelines we must adhere to while allocating electrons to orbitals. To determine the valence electrons of an atom, electron configurations assist us to understand the chemical behavior of elements. The shell number (n), kind of orbital, and superscript indicating the number of electrons in the orbital are the first three symbols used to represent the electron configuration.
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. Describe how liquid changes to gas using the following terms at least once.
Word Bank: particle speed, thermal energy, particle spacing, liquid, gas, evaporation!
(please give an answer quickly!)
What is the solution that is added to the cartridge of local anesthetic that can trigger bronchospasms?
Vasoconstrictor Preservative is the solution that is added to the cartridge of local anesthetic that can trigger bronchospasms.
Contraction of the muscles that line the airways (bronchi) in your lungs is referred to as bronchospasms. This causes difficulty in breathing. Chest tightness, Wheezing, Shortness of breath, Difficulty breathing are some of the symptoms of bronchospasms.
Vasoconstrictor Preservative is an additive which is used in local anesthetic. It enhance the duration and quality of the local anesthetic and also decreases surgical blood loss. Local anesthetics without a vasoconstrictor should be used in patients with sulfite allergy. Epinephrine, Levonordefrin, and Norepinephrine are some of the vasoconstrictors used with local anesthetic.
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The elements br2 and icl have the same number of electrons, yet br2 melts at -7.2 0c and icl melts at 27.2 0c. explain.
The elements Br₂ and ICl have the same number of electrons, yet Br₂ melts at -7.2°C and ICl melts at 27.2°C because Br₂ is a non-polar molecule with dispersion force as intermolecular interaction between them, whereas ICl is a polar molecule with dipole-dipole interactions and dispersion foces as intermolecular interaction.
ICl is with permanent dipole moment as the electronegativities of Cl and I are diffferent from each other.
The melting point of any compound rests on the intermolecular forces' stregth. More energy is required for stronger intermolecular forces so that it can overcome and have a higher melting point.
In Br₂ and ICl, the strength of dispersion force is similar because they have same number of electrons. But ICl have stronger dipole interactios too.
Therefore, strength of intermolecular forces is larger in ICl than in Br₂, so ICl have a high melting point of 27.2°C than Br₂ ( -7.2°C).
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The formula weight of ammonium sulfate ((nh4)2so4), rounded to the nearest integer, is ________ amu.
a. 264
b. 132
c. 118
d. 100
e. 116
The formula weight of ammonium sulfate ((NH₄)₂SO₄), rounded to the nearest integer, is 132 amu
Ammonium sulfate ((NH₄)₂SO₄) formula are as follow:
((NH₄)₂SO₄)
Now,28+8+32+64 = 132gm/mol
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What would be considered as a homogeneous among the the following mixtures?
emulsion
pizza
salad
soda
sulfide is formed when copper and sulfur are heated together. In this reaction, 130 g of copper reacts with 45 g of sulfur. After the reaction is complete, 8.0 g of unreacted sulfur remain. What is the mass of copper(II) sulfide formed?
The mass of copper(II) sulfide formed when copper and sulfur are heated together is 167g.
How to calculate mass of products and reactants?The law of conservation of mass states that the mass of a substance can neither be created nor destroyed.
This law further explains that in a chemical reaction, the mass of the reactants must equal the mass of the products.
According to this question, sulfide is formed when copper and sulfur are heated together. In a reaction, 130 g of copper reacts with 45 g of sulfur.
However, after the reaction is complete, 8.0 g of unreacted sulfur remain. This suggests that the mass of sulfide produced is as follows:
(130g + 45g) - 8g = 167g
Therefore, the mass of copper(II) sulfide formed when copper and sulfur are heated together is 167g.
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A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol. What is its molecular formula?.
A molecule has an empirical formula of ch, and its molar mass is known to be 26 g/mol and the molecular formula is C₂H₂ ethyne
Molecular formula of compound is (CH)n and the given molar mass is 26g/mol
Molar mass of (CH)n, C=12=n(12+1)=13n
So 13n and n=2
=13×2=26 and given molar mass is also 26g/mol
So here two carbon and two hydrogen so molecular formula is C₂H₂ and name is ethyne
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A solution of cough syrup contains 5.00 ctive ingredient by volume. if the total volume of the bottle is 38.0 ml , how many milliliters of active ingredient are in the bottle?
In the bottle active ingredient are 1.9mL
The concentration in percent by volume can be expressed in the volume of the solute in mL per 100 mL of the solution. as such for a cough syrup with a concentration of 5.00 percent by volume, for every 100 mL of the solution, there are 5.00 mL of the active ingredient. from this the volume of the active ingredient in 38.0 mL of the cough syrup will be calculated as:
Volume of active ingredient = 38.0 mL × 5.00mL / 100mL = 1.9ml
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What are the approximate fractional concentrations of the follow- ing phosphate species at ph values of 0, 2, 4, 6, 8, 10, and 12?
a. h3po4
b. h po
c. po43
Polyprotic Acid : Acids that can mislay, and bases that can gather up, more than one H+ (e.g. diprotic H2A and triprotic H3A acids).
Ionization take place stepwise, and each and every step has its own Ka.
H3PO4 (aq) ⇌ H+ (aq) + H2PO4 - (aq) Ka1 = 7.2 x 10-3
H2PO4 - (aq) ⇌ H+ (aq) + HPO4 2- (aq) Ka2 = 6.3 x 10-8
HPO4 2- (aq) ⇌ H+ (aq) + PO4 3- (aq) Ka3 = 4.2 x 10-13
According to question
To decide the fractional concentrations of one and all species at assorted pH values, first write the Henderson-Hasselbalch equation for each and every dissociation reaction.
Formula of Henderson-Hasselbalch equation is :
pH = pKa + log10 ([A–]/[HA])
pH = pK1+log[H2PO^4-] / [H3PO4]
pH=pK2+log[ HPO^2-] / [H2PO^4-]
pH = pK3+log[PO^3- 4] / [HPO^2- 4]
a. Fraction of H3PO4: pH0 = 0.993; pH2 = 0.58; pH4 = 0.01 ; pH 6 is negligible.
b. Fraction of HPO4 ^2- : pH 0 is negligible and 0.06; pH8 = 0.86; pH10 = 1.0; pH12 = 0.72
c. Fraction of PO3 ^2- : negligible at any pH < 10 ; pH 12 = 0.28
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a different scientist makes zinc iodide by the same method. the scientist obtains 12.5g of zinc iodide. the percantage yeild in this reaction is 92.0% whta is the maximum theoretical mass of zinc iodide produced in this reaction?
A different scientist makes zinc iodide by the same method. the scientist obtains 12.5g of zinc iodide. the percentage yield in this reaction is 92.0% then the theoretical mass is 13.6 g.
What is percent yield?Percent yield is defined as a measure of actual number of mole obtained by reactant in comparison to the theoretical yield.
Percent yield equal to actual yield divided by theoretical yield multiply by 100
As given percent yield is 92%, actual yield is 12.5 g
Then Theoretical yield = actual yield / theoretical yield x 100
= 12.5 / 92 x 100 = 13.6 g
Thus, different scientist makes zinc iodide by the same method. the scientist obtains 12.5g of zinc iodide. the percentage yield in this reaction is 92.0% then the theoretical mass is 13.6 g.
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A physician orders an i.v. bolus injection of diltiazem hydrochloride for a client with uncontrolled atrial fibrillation. what should the nurse do before administering an i.v. bolus?
The nurse will administer an i.v. bolus, gently aspirate the I.V. catheter to check for the blood return.
What is atrial fibrillation?
A-fib, or atrial fibrillation, is an irregular and frequently very rapid heart rhythm (arrhythmia) that can cause heart blood clots. A-fib increases the risk of stroke, heart failure, and other heart-related problems.
AFib is mostly brought on by chaotic signals that cause the atria, the two top chambers of your heart, to contract quickly and out of time. Because of how swiftly they contract, the heart's walls fibrillate. AFib may result from electrical system damage to your heart.
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If a resident drinks four ounces of water with a meal, how many milliliters (ml) has he consumed?
If a resident drinks four ounces of water with a meal, 120 mL has he consumed.
Water is a clear, thin liquid that, in its pure state, has no color or taste. Rain falls from the clouds and flows into rivers and oceans. All animals and humans need water to live. Give me a glass of water. Essential water requirement means the minimum amount of water required for residential and commercial purposes for food processing, drinking, flushing toilets, firefighting, and hospital use.
Store at room temperature. Lubricate and moisten the joints. Protects the spinal cord and other delicate tissues. Removes waste products from urination, perspiration and bowel movements. Most tap water in the United States comes from surface or groundwater. Spring water refers to bodies of water (rivers, streams, lakes, reservoirs, springs, groundwater, etc.) that feed public drinking water supplies or private wells.
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The is the si unit that expresses the amount of substance. Specifically, it is defined as the amount of substance containing the same number of entities as the number of in exactly 12 g of carbon-12.
The Mole is the SI unit that expresses the amount of substance. Specifically, mole is defined as the amount of substance containing the same number of entities as there are in the 12 grams of Carbon - 12.
Mole is denoted by using symbol mol.
Mole = 6.022 x 10²³ elementary entities.
These number of elementary entities in 1 mole is equal to or called as an Avogadro's number. Mole is equal to 6.022 x 10²³ because this number of entity is same as in exactly 12 g of carbon-12.
It is a very important SI unit of measured which is used by the chemists. Moles are used in measuring in small or tiny things such as atoms, molecules and the other tiny particles.
A mole is the atomic weight of any molecule which is measured in grams. The concept of mole might be used for the mass and number of particles conversion.
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An inactive substance used in a controlled experiment to test the effects of an active substance.
Answer:
its placebo it is inactive substance not active like outer drugs which forms bonds with chemicals present in our body
