If you assumed 100 total atoms in a sample, you could relate the % values shown in the sim into a number you could use for your calculation of average atomic mass is
Average atomic mass = ∑ ( isotope mass × % of abundance )
To calculated the average atomic mass, we have to multiply the isotopes mass of each to the % abundance then add .
the formula for the calculation of average atomic mass :
Average atomic mass = ∑ ( isotope mass × % of abundance )
Thus, If you assumed 100 total atoms in a sample, you could relate the % values shown in the sim into a number you could use for your calculation of average atomic mass is
Average atomic mass = ∑ ( isotope mass × % of abundance )
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1. a. What is work? Write its SI unit and the factors affecting work
when 27.64 g of a hydrocarbon is burned in a bomb calorimeter, the temperature increases by 54.91c. if the heat capacity of the calorimeter is 68.5 j/c and the sample is submerged in 1000 ml of water, how much heat (in kj) was produced by the hydrocarbon combustion?
By using the data given in the text and the specific heat capacity of water and its density, we can calculate that the amount of heat produced by hydrocarbon combustion was 233.6 kJ.
The heat released by hydrocarbon combustion is absorbed by the calorimeter and the water in it. To calculate the amount of heat (Q) produced by the combustion, we are going to use the specific heat capacity of water (c = 4.186 J/g°C), the heat capacity of the calorimeter (q = 68.5 J/°C) and the difference in temperature (ΔT = 54.91 °C):
heat absorbed by the calorimeter = ΔT*q
heat absorbed by water = ΔT*c*m
Q = ΔT*q + ΔT*c*m
m - the mass of water
To obtain the mass of water, we are going to use the volume (V = 1000 mL) of water and its density (d = 1.00 g/mL):
d = m/V ⇒ m = d * V
m = 1.00 g/mL * 1000 mL
m = 1000 g
Now we can plug all the known values in the formula for Q:
Q = 54.91 °C * 68.5 J/°C + 54.91 °C * 4.186 J/g°C * 1000 g
Q = 233,614.595 J
Q = 233.6 kJ
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3.23x106 kJ to kcal
Express the value kilocalories in to three significant figures
help me please!
The value into kilocalories up to three significant figures is 77.1 x 10^3 kilocalories
1 kj = 0.239 kilocalorie
3.23 x 10^6 kJ x 0.239 kilocalorie = 77.1 x 10^3 kilocalories
3.23 x 10^6 kJ = 77.1 x 10^3 kilocalories
What is Significant figure ?In chemistry, Significant figures are the digits of value which carry meaning towards the resolution of the measurement. They are also called significant figures in chemistry. All the experimental measurements have some kind of uncertainty associated with them.
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The strong attractive forces in ionic crystals make them ______, ______, and ______ solids. Group of answer choices rigid, hard, and brittle rigid, clear, and electronegative homogeneous, brittle, and ionic hard, electronegative, and homogeneous
The strong attractive forces in ionic crystal make them rigid , hard and brittle solid.
Ionic crystal are so strong because of the strong attractive forces between ions . Ionic compound formed between a positively charged ion and a negatively charged ion , the bond between them are so strong that make ionic crystal brittle. and also make it rigid. the presence of strong electrostatic force of attraction make the ionic crystal so hard. Due to the non directional nature of ionic bond make the crystal brittle.
Thus, The strong attractive forces in ionic crystal make them rigid , hard and brittle solid.
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which is the correct answer
Answer C I think
Explanation:
which of the following statement(s) is/are true about chemical kinetics? group of answer choices chemical kinetics shows the transfer of energy in the form of heat and/or work. chemical kinetics is the branch of physical chemistry that is concerned with the direction in which a process occurs but in itself tells nothing about its rate. a reaction rate law must match the coefficients in the balanced chemical equation reaction rate can be defined as the decrease in the concentrations of reactants with time. chemical kinetics is the study of the rates of reactions.
The following two statements are true about chemical kinetics.
1. Chemical kinetics is the study of the rate of reactions.
2. A reaction rate can be defined as the decrease in the concentrations of reactants with time.
Chemical kinetics deals with the study of rate of chemical reactions. Rate of reaction is defined as the measure of the change in concentration of the reactants or the change in concentration of the products per unit time.
The reaction rates decrease with time because reactant concentrations decrease as reactants are converted to products. The rate decreases as the reaction proceeds.
A→B
A= reactant rate of reaction =-[tex]\frac{d[A]}{dt}[/tex]
B=product rate of reaction=+[tex]\frac{d[B]}{dt}[/tex]
This means that the concentration of 'A' decrease with respect to time. It can also be noted by measuring the increase in the Concentration of B with the passage of time.
Negative sign indicates the conc. of reactants decreases with time
Positive sign indicates that conc. of product increases with the passage of time .Remember rate of reaction always positive.
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Which of the following compounds contains the greatest percent by mass of nitrogen
Answer:
[tex]A\colon NH_3[/tex]
Explanation:
Here, we want to get which of the compounds have the highest percentage by mass of nitrogen
What we have to do here is to divide the mass of nitrogen atoms in the compound by the molecular mass of the compound
a) NH3
The atomic mass of nitrogen is 14 amu, the atomic mass of hydrogen is 1 amu
The molar mass is thus 14 + 3(1) = 17 g/mol
The percentage by mass of nitrogen will be
14/17 * 100 = 82.35 %
b) HCN
The atomic mass of carbon is 12 amu
Thus, we have the molar mass as
1 + 12 + 14 = 27 g/mol
Percentage of nitrogen by mass will be : 14/27 * 100 = 51.85 %
c) For N2O
The atomic mass of oxygen is 16 amu
The molar mass of the compound will be 14(2) + 16 = 44 g/mol
Percentage of nitrogen by mass will be = 28/44 * 100 = 63.64 %
d) NI3
The atomic mass of iodine is 127 g/mol
So the molar mass of the compound will be:
14 + 3(127) = 395 g/mol
Percentage by mass of nutrogen will be
14/395 * 100 = 3.54 %
From what we have, the highest percentage by mass of nitrogen is 82.35 % and that belongs to ammonia (NH3)
The enzyme that catalyzes the synthesis of atp as hydrogen ions flow down their concentration gradient is called.
The enzyme that catalyzes the synthesis of ATP as hydrogen ions flow down their concentration gradient is called ATP synthase.
What is ATP synthase?In the inner mitochondriаl membrаne, hydrogen ions hаve just one chаnnel аvаilаble: а membrаne-spаnning protein known аs АTP synthаse. Conceptuаlly, АTP synthаse is а lot like а turbine in а hydroelectric power plаnt. Insteаd of being turned by wаter, it’s turned by the flow of hydrogen ions moving down their electrochemicаl grаdient. Аs АTP synthаse turns, it cаtаlyzes the аddition of а phosphаte to АDP, cаpturing energy from the proton grаdient аs АTP.
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Synthetic materials are not found in nature and therefore they are typically developed in laboratories.
True
False
Answer: True
Explanation: Synthetic materials are not found in nature and can be created in labs using chemicals and compounds.
Elements that readily gain electrons tend to have a
a) high ionization energy and low electronegativity
b) low ionization energy and low electronegativity
c) high ionization energy and high electronegativity
d)l ow ionization energy and high electronegativity
Answer:
C. high ionization energy and high electronegativity
Explanation:
When an electron is gained or lost from an atom or a molecule, an ion is formed. When a molecule or atom gains electrons, anions (which are negatively charged ions) are formed.
the total pressure of gases a, b, and c in a closed container is 4.1 atm . if the mixture is 36% a, 42% b, and 22% c by volume, what is the partial pressure of gas c? view available hint(s)for part a the total pressure of gases a, b, and c in a closed container is 4.1 . if the mixture is 36% a, 42% b, and 22% c by volume, what is the partial pressure of gas c? 1.5 atm 1.7 atm 0.22 atm 0.90 atm
Answer:
Explanation:
so
What atom matches this electron configuration?
1s22s22p63s2 3p64s23d104p65s24d105p66s24f145d9
Mercury
Thallium
Gold
Platinum
Answer:
Gold
Explanation:
To recognize what element this is, we can simply look at the last orbital (5d9) and go to the periodic table and see what element is in that final orbital.
We go to row 6 (because of the 6s orbital at the beginning of this row) and then we see that our 6s orbital is full with 2 electrons, then our 4f orbital is full with 14 electrons, and our 5d orbital is not full where we only have 9 electrons instead of 10.
We then go to our 5d orbital and count 9 times into that orbital and end up with our final element being Gold (Au).
if you take a square tlc plate and develop a compound mixture with one solvent mixture, dry the plate, and later develop it with a different solvent mixture; you can separate one set of compounds well and then separate another set of compounds well. in which directions should you develop the tlc plate with the two different solvent mixtures? this technique is often used to separate molecules of biological interest.
You should develop the TLC (thin layer chromatography) plate orthogonally (under a 90-degree angle) to the original direction of development (along its width, while the original development was along the length of the TLC plate).
This technique is called 2D TLC (two-dimensional thin layer chromatography) and is usually employed to analyze and preparatively separate very complex mixtures that cannot be separated using only one solvent system. The initial development (along the length of the TLC plate) enables crude separation into groups of compounds with similar retention factor (Rf). These groups can then be further separated using a different solvent system by developing the same TLC plate along its width.
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How many moles are in 2.931g of sulfur?
when monosaccharides are bonded together a. polysaccharides are formed by combining many monosaccharides. b. oligosaccharides are formed by combining a few monosaccharides. c. all of these d. one h2o molecule is lost for each new link formed.
When monosaccharides are bonded together c) all of these are correct.
Monosaccharides can be described as sugars from which all other complex forms of sugars are formed. Monosaccharides are the simplest form of sugars the combination of which leads to the formation of disaccharides, polysaccharides and oligosaccharides.
When the monosaccharides join in order to form complex sugar molecules, a single molecule of water is lost by each new link or joining of molecules that occur.
As monosaccharides are simplest of sugars, they are more easily absorbed as compared to other types of sugars.
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currently, the heaviest alkaline earth metal is radium (atomic number 88). if we ever discover/synthesis them, what will be the atomic numbers of the next two alkaline earth metals?
Atomic number. should be 120.
due to.... a/q
Alkaline earth metals are part of the eighth group and are known to exist in two groups.
Consequently, the element's atomic number will be 120.
What is meant by atomic number?The quantity of protons in an atom's nucleus is known as the atomic number. An element's identity is determined by its proton count (i.e., an element with 6 protons is a carbon atom, no matter how many neutrons may be present).
A chemical element's atomic number is its position in the periodic system, which places the elements in ascending order of the number of protons in their nuclei. As a result, the atomic number is also determined by the number of protons, which is always equal to the number of electrons in a neutral atom.
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what is stripped from each water molecule
Answer:
HS is stripped from each O.
how many atoms are in 2.5 moles of c4h802
Answer:
1.505 × 10²⁴ atomsExplanation:
To find the number of entities in a given substance we use the formula
N = n × L
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question
n = 2.5 moles
We have
N = 2.5 × 6.02 × 10²³ = 1.505 × 10²⁴
We have the final answer as
1.505 × 10²⁴ atomsHope this helps you
Write about one example of a positive feedback in the human body. Name what the stimulus is and how the response impacts this stimulus. Someone please help me with this assignment
An example of positive feedback in the human body may be the increased production of a hormone in response to the products of the same hormone, a stimulus is a reaction produced as a consequence of a change in the environment, while a response impacts the stimulus to maintain homeostasis.
What is positive feedback?The expression positive feedback is used in biology to explain the output of a process that may feed the input of the same biological process, such as occurs when a hormone is synthesized depending on the concentration of its hormonal product.
Moreover, a stimulus is a change in conditions that surround an organism and it leads to a concomitant response to maintain the state of equilibrium which is referred to as homeostasis.
Therefore, with this data, we can see that homeostasis and stimulus are interrelated, which positive feedback is a response as the output of the same process.
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copper(ii) ions appear blue in aqueous solution. this is the transmitted color. the wavelengths of light that are not absorbed give rise to the perceived or transmitted color of a substance. based on the principle of complementary colors, which colors and wavelengths would you expect to be the most strongly absorbed by cu 2 ions?
Based on the Principle of Complementary Colors , the colors and wavelengths expected to be the most strongly absorbed by cu 2+ ions are :-
Orange : 600–640 nm
Blue : 450–480 nm
Violet :400–450 nm
Green : 450–560 nm
Red : 640–700 nm
Yellow : 560–600 nm
Complementary color are pairs of colors which, while blended or mixed, cancel every different out (lose hue) via generating a grayscale color like white or black. whilst located next to every other, they devise the most powerful contrast for those colours. Complementary colours may also be known as "opposite colorings".
The RGB coloration version, invented inside the 19th century and absolutely advanced inside the twentieth century, uses combos of pink, inexperienced, and blue mild towards a black heritage to make the colours visible on a computer monitor or television display. Within the RGB version, the primary colors are purple, green, and blue. The complementary number one–secondary combinations are crimson–cyan, inexperienced–magenta, and blue–yellow. Inside the RGB colour version, the mild of complementary shades, consisting of pink and cyan, combined at full depth, will make white mild, for the reason that complementary hues comprise mild with the whole variety of the spectrum. If the light isn't always completely severe, the resulting mild will be gray.
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If we weighed a cup of water and a spoonful of pepper separately and then stirred the pepper into the water and weighed the mixture, how do you think the weights would compare? Why? What if we did the same with sugar?
Answer:
it would be the same weight but it's ith sugar I think it would way more
which statement about matter is true? responses matter is anything that is made of atoms and that has mass. matter is anything that is made of atoms and that has mass. matter is a compound. matter is a compound. matter is anything that is made of organic substances and is found on the earth. matter is anything that is made of organic substances and is found on the earth. matter is an element.
The true statement about Matter is that matter is anything that is made up of atoms and that has mass.
Matter is anything which is made up of mass and that has mass. and that occupies space.
If we talk about space, there is no matter because there is nothing but vacuum.
Matter is a general terms given to a group of atoms or molecules which are taken in a general.
We all are made up of atoms, because we al have mass and we all occupy some space. The same goes to anything that we can see or touch or feel that it exist.
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Answer: Matter is anything that is made of atoms and that has mass.
Explanation: I took the test.
Simple expriment with Candle that Show the necessary of air far t burining Cansiser how the Scientific method in this Simple experment with air for buring under to d/F Conditions Applies in this necessary
Answer:
use a tumbler to cover a candle that is burning, after a few minutes it turns off automatically without any external forces due to the absence of oxygen
Explanation:
exactly 25.0 ml of an aqueous solution of strontium hydroxide required 32.0 ml of 0.200 m nitric acid to neutralize it. what is the concentration of the strontium hydroxide solution? give only your numerical answer and do not include the m. for example, 0.262 or 1.25.
Ba(OH)2(aq) + 2HNO3(aq) ==> 2H2O(l) + Ba(NO3)2(aq) ... balanced equation
What is balanced equation?A chemical equation that is balanced has the same number of each type of atom on both sides of the equation. Subscripts are a component of the chemical formulas for the reactants and products that show how many atoms of the previous element there are in each.
note the stoichiometry ... 2 mols HNO3 for each 1 mol Ba(OH)2
Now we can use dimensional analysis and the noted stoichiometry to solve the problem:
32.0 ml HNO3 x 1 L/1000 ml x 0.200 mol / L = 0.0064 mols HNO3 used
0.0064 mol HNO3 x 1 mol Ba(OH)2 / 2 mols HNO3 = 0.0032 mol Ba(OH)2 present
Concentration of Ba(OH)2 = mols/L = 0.0032 mols / 0.0250 L = 0.128 M
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two compounds might have spots with the same rf value in a chromatography experiment and not be identical compounds. which proposed chromatography experiment could best help determine whether the compounds are identical? select one: repeat the original experiment with a different solvent system repeat the original experiment with the development chamber jar open repeat the original experiment with larger spots of each compound repeat the original experiment with a mixture of the compounds in a single spot
The chromatography experiment which would best decide whether the compounds are identical or not is to Repeat the original experiment once more with various solvent systems;
If two things have the same Rf value, they are probably the same compound, but not always. They are definitely distinct compounds if their Rf values differ.
Compounds with a low polarity have higher Rf values than compounds with higher polarity. Compounds' absorptivity typically rises in tandem with their polarity—that is, the more polar a compound is, the more strongly it binds to the adsorbent. Solvents' eluting power increases with polarity. In diverse solvents, different compounds with identical Rf values might behave differently.
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can someone help me please?
What pressure will be required for neon at 30°C to have the same density as nitrogen at 20°C and 1.0 atm?
1.5 atm pressure will be required for neon at 30°C to have the same density as nitrogen at 20°C and 1.0 atm.
What is the theory of the ideal gas law?The relationship between a gas's pressure P, volume V, and temperature T in the range of low pressures and high temperatures, when the gas's molecules move virtually independently of one another, is known as the ideal gas law, also known as the perfect gas law.
Briefing:T[tex]_N_e[/tex] =30⁰C=(30+273)K=303K
T[tex]_N_2[/tex] =20⁰C=(20+273)K=293K
P[tex]_N_2[/tex] =1.0atm
Ideal gas constant - R=0.0821L⋅atm/ K⋅ mol
The molar mass of
Neon - M[tex]_N_e[/tex]=20.18g/mol
Nitrogen - M[tex]_N_2[/tex] =2⋅14.007g/mol=28.014g/mol
Determine the pressure P[tex]_N_e[/tex] required for neon at 30⁰C to have the same density (d) as nitrogen at 20⁰C.
d = m/V
We know that
n = m/M
Using the ideal gas law, we get
PV = nRT
PV = m/M *RT
Since
PM/RT = m/V =d
d = PM/RT
d= [tex]\frac{P_{N_2} M_{N_2}}{R T_{N_2}}[/tex]
d = 1.0 atm * 28.014 g/mol/0.0821L atm/K mol 293K
d = 1.2 g//L
Since both gases have the same density, we can calculate the pressure of neon gas, using
[tex]d=\frac{P_{N e} M_{N e}}{R T_{N e}}[/tex]
[tex]P_{N e}=\frac{d R T_{N e}}{M_{N e}}[/tex]
[tex]P_{N e}[/tex]=1.2g/L . 0.0821L . atm/K.mol.303 K/20.18 g/mol
[tex]P_{N e}[/tex]=1.5 atm
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Which list consists of elements that have the most similar chemical properties?
a) Cu, Zn, Fe
b) K, Ca, Br
c) Mg, Al, Si
d) Cs, Na, K
The list that consists of elements that have the most similar chemical properties is caesium, sodium and potassium (option D).
What is the periodic table?Periodic table is the tabular chart of the chemical elements according to their atomic numbers so that elements with similar properties are in the same group (column).
The periodic table is made up of chemical elements arranged in groups and periods. Chemical elements in the same group possess similar chemical properties.
According to this question, the following elements are in the same group 1:
Caesium is a chemical element (symbol Cs) with an atomic number of 55. It is a soft, gold-colored, highly reactive alkali metal. Sodium is a chemical element (symbol Na) with an atomic number of 11 and atomic weight of 22.98977.Pottasium is an element (symbol K) with an atomic number of 19 and atomic weight of 39.0983.Therefore, Cs, K and Na will have the most similar chemical properties because they belong to the same group.
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a mineral compound is composed of mn and o. if 77% of the mass of the mineral compound is due to manganese, what is the empirical formula of the mineral compound?
Answer:
MnO
Explanation:
See the attachwed worksheet
calculate the volume of concentrated nitric acid (16 m) required to react with 0.41 g of cu(s) if you use 1.86 ml (an excess) of hno3, what volume of 5.0m naoh will you need to neutralize the solution after the copper is completely dissolved?
The volume of Concentrated nitric acid (16 m) required to react with 0.41 g of cu(s) if you use 1.86 ml (an excess) of hno3, what volume of 5.0m naoh will need to neutralize completely dissolved is 0.704 ml
4 HNO3(l) + Cu(s) ==> Cu(NO3)2(s and aq) + 2 NO2(g) + 2 H2O(l)
According to net Ionic equation 4 moles of HNO3 reacts with 1 mole of Cu(s)
moles of Cu in 0.36 gm of Cu = 0.36/63.5
moles = molarity*volume(L)
moles of Cu*4 =moles of HNO3
Let volume of HNO3 be x
0.36/63.5*4 = 16*x
x = 1.42 ml
c. Volume of HNO3 added = 1.64 ml
excess of HNO3 = 1.64-1.42
= 0.22 ml
Normality of NaOH and HNO3 is same i.e. equal moles of NaOH and HNO3 neutralises itself
molarity of NaOH = 5 moles/litre
moles of NaOH = Moles Of HNO3
5*x = 16*0.22
x = 0.704 ml
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Which elements has the lowest ionization energy
cs, mg, cu, ge, n, s, f