The mass of an atom of chlorine 37 is heavier than the mass of an atom of chlorine 35.
Mass number of atomsThe mass number of atoms is the sum of the protons and neutrons in the nuclei of atoms.
Mathematically:
Mass number = number of protons + number of neutrons
The protons are the positively charged particles located in the nuclei of atoms while the neutrons are neutrally charged particles found in the nuclei of atoms as well.
Both proton and neutron numbers determine how heavy an atom would be. Electrons of atoms are usually located outside the nuclei and contribute a negligible amount to the weight of atoms.
Thus, a chlorine atom with an atomic mass of 37 is heavier than a chlorine atom with a mass of 35.
Although both atoms are from the same elements, they are called isotopes. Isotopes of the same element have the same proton number but different mass numbers.
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3.4 x 10^23 atoms of potassium to grams
To solve this problem, we must take into account Avogadro's number. Avogadro's number tells us that in one mole of any substance there are 6.022x10^23 atoms. Applying this relationship we have that the moles of potassium (K) are:
[tex]\begin{gathered} molK=givenatomsK\times\frac{1molK}{6.022\times10^{23}atoms} \\ \end{gathered}[/tex][tex]\begin{gathered} molK=3.4\times10^{23}atomsK\times\frac{1molK}{6.022\times10^{23}atoms} \\ molK=0.6molK \end{gathered}[/tex]Now, to go from moles to grams, we must multiply the moles by the molar mass of potassium. The molar mass of potassium is 39.1g/mol. So, the grams of potassium will be:
[tex]gK=givenmolK\times\frac{MolarMass,gK}{1molK}[/tex][tex]\begin{gathered} gK=0.6molK\times\frac{39.1gK}{1molK} \\ gK=22.1gK \end{gathered}[/tex]Answer: In 3.4x10^23 atoms of potassium there are 22.1 grams
a buffer contains equal amounts of a weak acid and conjugate base and has a ph of 5.25. how will the concentration of conjugate base in the buffer change after the addition of a small amount of strong base?
The concentration of conjugate base in the buffer change after the addition of a small amount of strong base The concentration of conjugate base will increase. HA+BOH ⇒ H2O +AB
Buffer capacity refers to the amount of added acid or base that can be neutralized by a buffer. This is determined by the concentration of the conjugate acid and conjugate base. As these concentrations increase, the buffering capacity increases. A buffer is a solution that can withstand changes in pH due to the addition of acidic or basic components.
Can neutralize small amounts of added acids or bases and keep the pH of the solution relatively stable. When a strong base is added to a buffer the hydroxide ions are consumed by the weak acid, forming water, and consumed by the weak conjugate base of the acid. The number of weak acids decreases and the number of conjugate bases increases.
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You examined the effects of heat on equilibrium in part iv. Was the reaction you observed endo- or exo- thermic? does heat act as a reactant or product? what happened when you removed heat by placing the solution in the ice bath? what would you expect to happen if you were to add heat?.
1) The reaction is exothermic and heat is a product
2) The color would turn to pink.
What is an endothermic reaction?Let us recall that an endothermic reaction is one in which the increase in the temperature of the system would drive the forward reaction. This implies that the equilibrium would shift to the right when the set up is heated. Since the color of the solution changes to blue when heated hence the reaction is exothermic.
If you removed heat by placing the solution in the ice bath, we can see that we have removed the heat thus we expect that the reverse reaction would take place and the color would change to pink.
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A certain atom contains 53 protons, 78 neutrons, and 54 electrons. What is the mass number of this atom?.
The mass number of an atom that has 53 protons, 78 neutrons, and 54 electrons would be 131.
A mass number can be described as the sum total of the number of protons and neutrons that are contained within the nucleus of an atom.
If we want to calculate the mass number of an atom, we need to add the number of neutrons present inside the atoms with the number of protons present inside the atom.
As mentioned in the question, the number of protons inside the said atom is 53 whereas the number of neutrons is 78. Hence,
53+78= 131
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A particular compound has an enthalpy of vaporization of 28900 J/mol. At 278 K it has a vapor pressure of 103 mmHg. What is its vapor pressure at 309 K? (R = 8.31 J/(K· mol))a. 29.4mmhgb. 99.5mmhgc. 107mmhgd. 194mmhge. 361mmhg
Answer:
[tex]E\text{ : 361 mmHg}[/tex]Explanation:
Here, we want to get the vapour pressure of the compound at the given temperature
We can use the Clausius-Clapeyron equation for this
Mathematically, we have this as:
[tex]\ln (\frac{P_1}{P_2})\text{ = -}\frac{\Delta H}{R}(\frac{1}{T_1}-\frac{1}{T_2})[/tex]So,let us identify the values:
P1 = 103 mmHg
P2 = ?
ΔH = 28,900
R = 8.31
T1 = 278 K
T2 = 309 K
We now proceed to substitute these values into the equation above as follows:
[tex]\begin{gathered} \ln (\frac{103}{P_2})\text{ = -}\frac{28900}{8.31}(\frac{1}{278}-\frac{1}{309}) \\ \\ \ln (\frac{103}{P_2})\text{ = -3477.74 (}\frac{31}{85902}) \\ \\ \ln (\frac{103}{P_2})\text{ = -1.255} \\ \\ e^{-1.255}\text{ = }\frac{103}{P_2} \\ P_2\text{ = 361 mmHg} \end{gathered}[/tex]What do all waves have in common?
you can always see them
They carry energy
They absorb light
They do not carry energy
''They carry energy''. is the right statement about waves.
What are a wave and its types?A wave is defined as a disturbance in a medium that carries energy without any movement of particles. It may take elastic deformation, a variation of pressure, electric intensity, magnetic intensity, electric potential, and temperature. There are three types of waves i.e. matter waves, mechanical waves, and electromagnetic waves.
All types of waves have the same basic properties of reflection, refraction, diffraction, and interference. All waves have a wavelength, frequency, speed, and amplitude. A wave can be explained by its length, amplitude, and frequency. All waves transfer energy from one place to another, they can also be reflected as well as refracted.
So we can conclude that option A is the right answer about the waves.
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problems of using ionic compound and covalent compound in industry
Answer:
Problems of Using Ionic and Covalent Compounds in Medicine
Stomach pain.
Nausea.
Vomiting.
Heartburn.
Gas.
Constipation.
Diarrhea.
why was it important to use a volumetric pipette and volumetric flasks (instead of some other glassware, for example, a graduated cylinder, etc.) for the preparation of all solutions in this procedure?
It is important to use a volumetric pipette and volumetric flasks because they are marked with one trace, they are calibrated and there are very less chance of error in them.
The percentage error of volumetric flask is very low at 0.3%. Volumetric pipette and volumetric flasks are specially designed to give accurate measurements of liquids and make them suitable for preparing standard solutions.
The volumetric pipette has a long and narrow neck which makes it easier to measure.
Graduated cylinders are more accurate then beakers. However they are not used to carry volumetric evaluations for this purpose volumetric tools like flasks and pipettes are used because they are more accurate and exact.
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Which of the following diagrams has correctly shaded the metals in blue?
1) Groups of elements in the periodic table.
Metals are located in the middle and left side of the periodic table.
The second picture has correctly shaded the metals.
.
according to laplace's law: group of answer choices should remain inflated because the pressure inside of the alveoli is greater than atmospheric pressure should remain in a stable state should increase gas exchange during inhalation
According to Laplace's law lungs should remain inflated because the pressure inside of the alveoli is greater than atmospheric pressure.
According to this law of Laplace, if the radius of the blood vessel is larger than the wall tension required will be larger in order to withstand or overcome the pressure which is exerted by internal fluids or gases.
The alveoli are to remain inflated as the gaseous pressure which is developed inside the alveoli is greater than the pressure of atmosphere.
When the blood vessel thickens or its thickness increases, it will result in the reduction of the tension developed by the gas at a given constant pressure.
It was published in a research paper that according to law of Laplace, lung should remain inflated because air pressure in alveoli is more than the pressure of the atmosphere.
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is CL3 a compound element or mixture
Answer:
Elements
Explanation:
I'll assume that the correct element symbol is Cl, not CL. CL would mean a compound made up of one carbon (C) and one Unknown element (L), Cl means chlorine.
I aslo wonder if the compound is [tex]Cl_{2}[/tex] and not [tex]Cl_{3}[/tex]. Regardless, both would be elements. A compound is made up of 2 or more different elements. A mixture is 2 or more compounds.
in the laboratory, a student adds 44.2 ml of water to 20.6 ml of a 0.652 m hydroiodic acid solution. what is the concentration of the diluted solution? assume the volumes are additive.
The concentration of diluted solution is 0.2 M.
The concentration and volume are related by the formula - [tex] M_{1}[/tex] [tex] V_{1}[/tex] = [tex] M_{2}[/tex] [tex] V_{2}[/tex], where [tex] M_{1}[/tex] and [tex] M_{2}[/tex] are initial and final concentration. [tex] V_{1}[/tex] and [tex] V_{2}[/tex] are initial and final volumes.
Keep the values in relation to find the concentration of final diluted solution.
0.652 × 20.6 = [tex] M_{2}[/tex] × (44.2 + 20.6)
Performing addition on Right Hand Side
0.652 × 20.6 = [tex] M_{2}[/tex] × 64.8
Performing multiplication and division
[tex] M_{2}[/tex] = 13.43÷64.8
[tex] M_{2}[/tex] = 0.2 M
Thus, the diluted solution is 0.2 M.
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Which of these is an example of a physical change?
à rusting metal
& browning fruit
burning wood
melting ice
Answer:
The correct answer is Water boiling. Examples of physical change are freezing of water, boiling of water, melting of wax, etc. Examples of chemical change are digestion of food, burning of paper, rusting of metal, silver tarnishing, etc.
Please help me with this Chemistry problem..
2h2(g)+O2(g)----> 2H2O(g)
How any moles of o2 are required to react with 2 moles of H2
The number of moles of [tex]O_2[/tex] required to react with 2 moles of [tex]H_2[/tex] according to the reaction will be 4 moles.
Stoichiometric problemFrom the balanced equation of the reaction:
[tex]2H_2 (g) + O_2 (g) -- > 2H_2O (g)[/tex]
The mole ratio of hydrogen to oxygen is 2:1. This means that for every 1 mole of hydrogen that reacts to form 1 mole of water, 0.5 moles of oxygen is required. Also, for every 1 mole of oxygen, 2 moles of hydrogen are required.
Once the mole of hydrogen increases, the mole of oxygen also has to increase proportionately. Otherwise, oxygen becomes limited in availability, and hydrogen will be in excess.
From the equation of the reaction, 1 mole of oxygen requires 2 moles of hydrogen. Thus, with 2 moles of oxygen, 4 moles of hydrogen will be needed for a complete reaction.
In summary, the number of moles of [tex]O_2[/tex] that are required to react with 2 moles of [tex]H_2[/tex] is 4 moles.
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Help me to balance this equation please
Answer:
H202(aq)+2Fe2+(aq)+2H+=>2fe3+(aq)+2H20(l)
Explanation:
H202(aq)+2Fe2+(aq)+2H+=>2fe3+(aq)+2H20(l)
H202(aq)+2Fe2+(aq)+2H+=>2fe3+(aq)+2H20(l)
Continental crust layer of blank which forms the blank
a compound is found to contain 13.65 % carbon and 86.35 % fluorine by mass. what is the empirical formula for this compound? to answer the question, enter the elements in the order presented above.
Answer:
[tex]CF_{4}[/tex]
Explanation:
See attached worksheet
unit 3 balancing lab chemistry
HELP PLEASEEEEEEE
1. zn___AgCI->___ZnCI2+___Ag
2. FeCI3+___H2s->___FeCI2+___HCI+___s
3. ___Ag2O->___Ag+___O2
4.AI2O3->___AI+___O2
5.K+___H2O->___KOH+___H2
6. Caco3->___CaO+___CO2
7. MG+___O2->Mgo
8. CO+___Fe2O3->___Fe+___CO2
9. H2+___Fe2O3->___Fe+___H2O
10. ___HCI+ZN->___H2+___ZnCI2
zn + 2 AgCI-> ZnCI2+ 2Ag
2 FeCI3+ 3 H2s->___FeCI2+ 6 HCI+___s
2 Ag2O-> 4 Ag+ O2
4AI2O3-> 3 AI+ 2O2
2 K+ 2H2O-> 2 KOH+ H2
Caco3-> CaO+ CO2
2 MG+ O2-> 2MgO
CO+ 3 Fe2O3-> 2 Fe+ 3CO2
2 H2+ 3 Fe2O3-> Fe+ 3H2O
HCI+ 2 ZN-> H2+ ZnCI2
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preform the mathematical operation and then write the answer to the correct number of significant figures.
a) 100g + 10g
b) 903cm x 10cm
c) 0.6030 cm(2) ÷ 0.1cm
d) 9.5 mm + 0.083 mm
e) 430.0 mL - 10.2111 mL
f) 762.4 m + 3.2m + 1.21m
Preform the mathematical operation and then write the answer to the correct number of significant figures.
a) 110 g
b) 9030 cm
c) 6.0 cm
d)9.6 mm
e) 419.8 mL
f) 766.8 m
a) 100 g + 10 g = 110g
b) 903 cm × 10 cm = 9030 cm
c) 0.6030 cm² / 0.1 cm = 6.0 cm
here lowest significant is = 0.1 , so ans will round off till first decimal.
d) 9.5 mm + 0.083 mm = 9.583 mm = 9.6 mm
e) 430.0 mL -10.2111 mL = 419.8 mL
f) 762.4 m + 3.2 m + 1.21 m = 766.8 m
here the lowest significant figure = 3.2 , so the ans will be round off to first decimal figure.
Thus, preform the mathematical operation and then write the answer to the correct number of significant figures.
a) 110 g
b) 9030 cm
c) 6.0 cm
d)9.6 mm
e) 419.8 mL
f) 766.8 m
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Which element has 2 valence electrons and 5 energy levels?
Answer:
its Boron i hope this helped.
Explanation:
elemental sulfur can be converted to sulfur trioxide by reaction with oxygen in the presence of a catalyst. upon addition of water, sulfuric acid is produced as represented by the equation: s8 12 o2 8 h2o 8 h2so4 what minimum mass of sulfur , in grams, is needed to prepare 17.5 g of h2so4? (give the number with one digit after decimal point; no units)
The minimum mass of sulphur , in grams, needed to prepare 17.5 g of [tex]H_{2} So_{4}[/tex]is 53.5 gram
The molecular mass of eight molecules of sulphuric acid is 784 grams.
So 256 grams of sulphur makes 784 grams of sulphuric acid
That means 17.5 grams of sulphur can give
[tex]\frac{784}{256}[/tex] ×17.5 grams of sulphuric acid
And by solving this we get 53.5 grams.
That's how we determined the required grams of sulphur in grams.
The mass of a given molecule is its molecular mass (m), which is expressed in daltons. Because they contain various isotopes of an element, different molecules of the same compound can have distinct molecular masses. According to IUPAC, the related quantity relative molecular mass is a unitless comparison between the mass of a molecule and the unified atomic mass unit (also called the dalton).
The molar mass, which is expressed in g/mol, is defined as the mass of a given substance divided by the amount of a substance. That makes the molar mass an average of many particles or molecules, and the molecular mass the mass of one specific particle or molecule.
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please help
could you measure the volume of an object with a cube shape using the overflow can explain your answer.
The volume of this cube-shaped area can be calculated by multiplying its length, width, and height i.e. length x width x height.
What is volume?Volume is defined as the area that any three-dimensional solid takes up. The shapes of these solids include cubes, cuboids, cones, cylinders, and spheres.
The cubic meter serves as its equivalent in the International System of Units. Given that it can be computed using lengths, it is not regarded as a fundamental unit of the SI. The liter is the most widely used measurement.
The cube's volume is equal to the edge's length raised by three.
Thus, the volume of this cube-shaped area can be calculated by multiplying its length, width, and height i.e. length x width x height.
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Which of the following provides the best evidence that organ systems in the human body interact with one another
The best evidence that organ systems in the human body interact with one another is shivering in response to sensing in the cold environment
Organ system is the group of tissue that work together for the overall function of organ and also organ system is the group of organ that work together to perform a specific function and the human organ consist of eleven organ system and that is respiratory, execratory, circulatory, digestive etc and the best evidence that organ systems in the human body interact with one another is shivering in response to sensing in the cold environment because when your muscle and skeletal system are working to help your body increase heat when shivering
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waste water treatment often has at least one oxidation-reduction step. in the collection of waste water, chlorine can be added to control corrosion by hydrogen sulfide to give sulfur and chloride ions. what is the balanced equation for the reaction that occurs in this step? include physical states in your answer.
The balanced reaction equation for this redox reaction looks like this:
H₂S(aq) + Cl₂(g) → S(s) + 2HCl(aq)
First, we write what we know about the reaction:
Hydrogen sulfide (H₂S) that is dissolved in the wastewater (so the physical state is (aq)) is reacting with gaseous chlorine (so Cl₂(g)) to form sulfur (which is solid at room temperature, and does not dissolve in water, so S(g)) and chloride ions (Cl⁻). To counter their negative charge, we add the hydrogen from H₂S to chlorides, which results in HCl, which is soluble in water, so the physical state is (aq):
H₂S(aq) + Cl₂(g) → S(s) + HCl(aq)
When we look at this equation we can see that it is not balanced, because we have 2 H atoms and 2 Cl atoms on the left, and only 1 of both on the right. The easiest way to rectify this is to add "2" in front of HCl, resulting in a balanced reaction equation:
H₂S(aq) + Cl₂(g) → S(s) + 2HCl(aq)
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9. running a strong enough electric current through water will cause it to decompose into hydrogen and oxygen gas. write the balanced chemical equation for this process. what is being oxidized, and what is being reduced?
Answer:
Explanation: when electric current is passed through water, water dissociates into hydrogen and oxygen. Hydrogen is deposited over negative pole and oxygen is deposited over positive pole. Deposition of hydrogen and oxygen at different poles is visible in the form of bubbles.
3.23x106 kJ to kcal
Express the value in kilogploring to three significant figures
help me please!
Hence 3.23×10⁶kJ = 771970 kilo calorie.
What is kilo joule?Kilo joule is a unit of energy that is equal to 1000 joules.
1 kilojoule is equal to 1000 joules:
∵ 1kJ = 0.239kcal
∴ 3.23×10⁶kJ = 3.23×10⁶ × 0.239
= 771970 kcal
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Consider the hydrate calcium chloride dihydrate: cacl2 · 2h2o. how many hydrogen atoms are in the compound?
Consider the hydrate calcium chloride dihydrate hydrogen atoms are in the compound are four
Hydrate calcium chloride dihydrate is the excellent water soluble crystalline calcium sources used compatible with chloride and chloride compounds can conduct electricity when fused or dissolved in water and here given compound is CaCl₂ × 2H₂O
So in that compound the hydrogen atom are four because this compound or this equation is balanced so in that compound four hydrogen atom are present
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Answer:
4
Explanation:
is the process of mixing ethanol and water exothermic or endothermic? how do you know (use numeric data to justify)? does this suggest presence of large clusters or small clusters in the mixture?
The reaction is exothermic as it involves a bond-forming process
when the liquids are mixed temperature of the reaction between the mixture increases.
There are small and large clusters in the mixture
The exothermic reaction involves the formation of new bonds which involves a combination of the bonds to form a new compound in our case water has hydroxy ions that bond with those of ethanol.
Mixing ethanol and water in volumetric glassware reduces the volume and increases the temperature.
The numerical example
Fill two 250 mL graduated cylinders to the line with water and ethanol pure temperature sensor shows both at room temperature. Next, move the temperature probe to an empty 500 mL graduated cylinder and pour the contents of the two smaller cylinders simultaneously and mix well.
The temperature of the mixture will rise by about 8 °C and the volume will decrease to 480 this indicates that the reaction is exothermic as the temperature rises and volume reduces
yes, clusters are present as ethanol falls between the spaces left by water as it has small molecules than that of water.
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what is a type of energy that powers a cell phone?