The pH can be obtained directly from the concentration using the formula below pH = - log [H⁺] Hence, pH of a 8.4x10⁻⁶ M H⁺ solution is 5.08.
What is pH ?
A figure expressing the acidity or alkalinity of a solution on a logarithmic scale on which 7 is neutral, lower values are more acid and higher values more alkaline.
Taking the negative logarithm of the concentration of hydronium ions that are in the solution:
pH = - log [H⁺]
= - log [8.4x10⁻⁶ ]
= 5.08
Hence, pH of a 8.4x10⁻⁶ M H⁺ solution is 5.08.
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The student ran out of time and did not do the second heating. Explain how this error would affect the calculation for the number of moles
The error caused will lower the number of moles when he did not do the second heating.This question is related to the empirical formula.
What is Empirical formula ?A formula giving the proportions of the elements present in a compound but not the actual numbers or arrangement of atoms.
The empirical formula is the simplest ratio of atoms in a given compound.
we know that heating is used to eliminate most of the water molecules which are attached to the compound in the question, it's given that the second heating was not performed by the students.
This means that there are still some water molecules attached to the compound. This will imply that higher mass will be calculated for the compound because the water molecules are also considered.
So now, if we look at the calculation for the number of moles of water in this, we can say that this will be lower than the actual amount.
This is because there are some unaccounted moles of water which are still attached to the compound and these will be accounted in the compound mass rather than the waters. Therefore, the number of moles will be lower.
Hence, The error caused will lower the number of moles when he did not do the second heating.
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Please help
Logan has been studying rocks at school. How could he learn more about the different types of rocks that come from volcanoes?
A.
collect rocks at the shore
B.
read comics about imaginary rocks
C.
explain to his sister how volcanoes form
D.
watch videos about volcanic rocks
Answer:
I think D is the answer. The others can't be answer. Specially B and D can't be the answer.
What mass of carbon monoxide is required to react completely with 318g of iron(III) oxide?
The balanced equation for this reaction is [tex]3\text{CO}+\text{Fe}_{2}\text{O}_{3} \longrightarrow 2\text{Fe}+3\text{CO}_{2}[/tex].
This means that for every mole of iron(III) oxide consumed, 3 moles of carbon monoxide are consumed.
Iron has an atomic mass of 55.845 g/mol.Oxygen has an atomic mass of 15.999 g/mol.This means that iron(III) oxide has a formula mass of 2(55.845)+3(15.999)=g/mol, and thus 318 g is equal to [tex]\frac{318}{159.687}=1.9913956677751 \text{ mol}[/tex].
So, this means we need [tex]3(1.9913956677751)=5.9741870033253 \text{ mol}[/tex] of CO.
Carbon has an atomic mass of 12.011 g/mol.Oxygen has an atomic mass of 15.999 g/mol.This means CO has a formula mass of 12.011+15.999=28.01 g/mol, and thus 5.9741870033253 moles have a mass of (28.01)(5.9741870033253), which is equal to about 167 g (to 3 sf)
The concentration of lead nitrate Pb(NO3)2
in a 0.726 M solution is __________ molal. The
density of the solution is 1.202 g/mL.
Answer: The concentration of lead nitrate Pb(NO3)2 in a 0.726 M solution is 0.755 molal.
Explanation:
Given:
The molar mass of Pb(NO3)2 is 331.2 g/mol
Assuming 1 litre of solution. This would equal 1202 g of solution
In the one litre of solution, you have 0.726 mol Pb(NO3)2
0.726 mol (331.2 g/mol) = 240.5 g Pb(NO3)2
Mass of water in 1 L of solution = 1202 g - 240.5 g = 961.5 g = 0.9615 kg
Molality = mols of solute / kg of solvent
= 0.726 mol / 0.9615 kg
= 0.755 m Pb(NO3)2
Which of the following separation techniques uses boiling points to separate the components of a mixture:
a. Filtration
c. Chromatography
b. Distillation
d. Magnetism
Option (b) is correct.
Some separation techniques are given below:- (a) FiltrationA separation technique called filtration is used to isolate pure chemicals from mixtures of particles, some of which are big enough to be caught by a porous medium.
(b) DistillationThe separation of combinations of two or more pure liquids is accomplished through distillation. The components of a liquid mixture are vaporized, then condensed and isolated during the purifying process of distillation.
(c) ChromatographyChromatography is the process of separating a mixture by passing it through a medium where the components move at various speeds, either in solution, suspension, or as a vapor (as in gas chromatography).
(d) MagnetismThe magnetic separation process involves attracting magnetic materials using a magnet to separate the components of mixes. Non-magnetic compounds are separated from magnetic ones using the magnetic separation technique.
From the above separation techniques, we can say that option(b) Distillation a separation process that uses boiling points to separate the component of a mixture is correct.
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How many xenon atoms are contained in 1.00 moles of xenon?
Answer:
6.022 x 10²³
Explanation:
The number of atoms = the number of moles x with the Avogadro's number.
(The Avogadro's number is 6.022 x 10²³ atoms / moles)
number of atoms = 1.00 moles x 6.022 x 10²³ atoms / mole
number of atoms = 6.022 x 10²³ atoms
(There is no need to simplify?) = 6.022 x 10²³
(ps. This is my first time doing this question so im sorry if i got it wrong
(つ﹏⊂)
324.55 cm - (6104.5 cm²/22.3 cm)
Answer: 50.806 cm is the correct answer.
Explanation: First divide 6104.5 cm^2 by 22.3 cm.
[tex]\frac{6104.5cm^2}{22.3cm} = 273.74 cm[/tex]
*Note: When dividing units, subtract the exponents, and when multiplying units simply add the exponents.
Then continue by subtracting 324.55 cm - 273.74 cm.
This should give you an answer of 50.806 cm.
Which quantity could best be measured with a meter stick?
A.
the amount of matter in a rock
B.
the width of a wooden block
C.
the volume of water in a cup
D.
the diameter of the Earth
Answer:
B
Explanation:
A meter stick measures distances ( like centimeters) so....B
it does NOT measure mass , volume or VERY large distances (Like earth's diameter)
The quantity could best be measured with a meter stick will be "the width of a wooden block".
What is meter stick?The measurement tool is known as a "meter stick" would be used to measure objects in meters and millimeters.
What is wooden block?A single new piece of wood would be used to create a miniature slit drum known as a wood block.
An instrument for measuring lengths in meters and centimeters is a meter stick, which measures one meter (hundred centimeters). A meter stick can be used to measure things such as the width of a bag or the length of a table.
The quantity that could best be measured with a meter stick will be "the width of a wooden block".
Therefore, the correct answer will be an option (b)
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What types of bonds and atoms are in the molecule shown below?
H₂C
C=C
H
CH₂-CH3
H
O A. Double bonds, triple bonds, carbon atoms, and hydrogen atoms
O B. Double bonds, triple bonds, carbon atoms, and helium atoms
OC. Single bonds, double bonds, carbon atoms, and hydrogen atoms
OD. Single bonds, double bonds, carbon atoms, and helium atoms
The types of bonds and atoms in the molecule shown below are C. Single bonds, double bonds, carbon atoms, and hydrogen atoms.
How many bonds can carbon form?Carbon can only form a bond with a maximum of 4 other molecules.
We have been given a molecule
H₂C CH₂-CH3
C=C
H H
In the given figure we can see that the molecule includes one double bond and other are single bonds.
Thus, The types of bonds and atoms in the molecule shown below are C. Single bonds, double bonds, carbon atoms, and hydrogen atoms.
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How many stereoisomers could exist for the following structure?
4
8
16
32
Answer:
64
Explanation:
ieijkjkjjsjsjsjsjsjskskakskskskskkkdksksjdjdjdjdjdjdjdjdndndndmdndndmdmdndndndjdjdjdjdjdkdkekrk
vinegar contains 5g of acetic in 100mL of solution so the (w/v)% concentration is:
The (w/v)% concentration of vinegar contains 5g of acetic in 100mL of solution is approx 0.5 %
What is Concentration ?The concentration of a chemical substance expresses the amount of a substance present in a mixture.
There are many different ways to express concentration.(w/v)% is one of them.
Given ;
Mass of solute(acetic acid) is 5.0 g Volume of solution is 100.0 mL.
We need to convert the grams of acetic acid to moles ;
Formula of acetic acid is CH₃COOH
Thus,
Molar mass of acetic acid = 2(12.01) + 4(1.01) + 2(16)
= 24.02 + 4.04 + 32
= 60.06 grams per mol
Moles of acetic acid = 5.0/60.06
= 0.083 moles
(w/v)% = 0.083 x 60 / 1000 x 100
= 0.498 %
= 0.5 %
Hence, The (w/v)% concentration of vinegar contains 5g of acetic in 100mL of solution is approx 0.5 %
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Given the following list of densities, which materials would float in a molten vat of lead provided that they do not themselves melt? Densities: g/mL: lead= 11.4; glass= 2.6, gold= 19.3, charcoal= 0.57, platinum = 21.4. Enter your answer as a word only. If two or more items would float include the word and between those two items.
The materials that would float in a molten vat of lead are glass and charcoal.
Which material floats on the solution?Glass and charcoal are the materials that would float in a molten vat of lead because they are less denser than the lead solution while on the other hand, platinum and gold get drowned into the solution because of its high density as compared to lead.
So we can conclude that the materials that would float in a molten vat of lead are glass and charcoal.
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What kind of reaction is symbolized by AB + CD → AD + CB?
O A. Decomposition
OB. Synthesis
O C. Double replacement
OD. Single replacement
C. Double replacement
cations and anions switch places
Magnesium burns in air with a dazzling brilliance to produce magnesium oxide: 2 Mg(s) + O2(g) → 2 MgO(s) How many moles of O2 are consumed when 2.10 mol of magnesium burns?
Answer:
1.05 mols of O2 gas
Explanation:
For this type of problem, it's important to understand what the balanced Chemical equation tells us:
Balanced Chemical equationsLet's look at the balanced chemical equation:
[tex]2Mg(s)+O_2(g)-- > 2MgO(s)[/tex]
This equation two sides of the reaction arrow. On the left are the reactants (things you start with, and that react during the chemical reaction), and on the right side are products (things that are produced during the chemical reaction that you end with).
The numbers in front of each compound tell how many of molecules are involved for a full reaction without anything left over. A "mol" is a large quantity ([tex]6.022*10^{23}[/tex]), in this case, of molecules , since it's unlikely you're only taking a single molecule of each substance (it would be so tiny, you wouldn't even know you were doing the reaction).
So,for every 2 moles of Magnesium used, we'll also need 1 mole of Oxygen, and it will produce 2 moles of Magnesium Oxide.
In a way, during the reaction it's almost like 2 moles of Magnesium is equal to 1 mole of Oxygen and is equal to 2 moles of Magnesium Oxide:
[tex]2 mol Mg(s)=1mol O_2(g)=2molMgO(s)[/tex]
From here, we can build some unit ratios, to convert between the known quantity of moles we have, and find the unknown quantity of moles that are requested.
Finding the right unit ratioWe know that we are looking at 2.10 mol of Magnesium, so we want a unit ratio with moles of Mg on the bottom. We want to find moles of O2, so we want a unit ratio of moles of O2 on top.
The unit ratio we want is the middle part of the equation, divided by the left part of the equation.
[tex]2 mol Mg(s)=1mol O_2(g)\\\frac{2 mol Mg(s)}{2 mol Mg(s)}=\frac{1mol O_2(g)}{2 mol Mg(s)}\\1=\frac{1mol O_2(g)}{2 mol Mg(s)}[/tex]
Since this quantity is 1, it is a unit ratio and can be multiplied to other things to change their units (for this problem).
Finding the answerStarting with what we know, and multiplying by our unit ratio:
[tex]2.10 mol Mg(s)*\frac{1mol O_2(g)}{2 mol Mg(s)}=1.05mol O_2(g)[/tex]
Notice that the units from the first quantity cancel with the units on the bottom of the fraction, leaving only the unit on top of the fraction ... the exact units we wanted!
So, 1.05mols of O2 would be consumed during the reaction if exactly 2.10moles of Magnesium are burned.
I need help with this one bad
Explanation:
it applies to pressure laws
Data are often arranged to highlight particular patterns. What other ways might you arrange the data shown in the Sample of Elements table?
The data shown in the Sample of Elements table can be arranged on basis of physical and chemical properties , atomic number , atomic weight , etc .
The data shown in the Sample of Elements table can be arranged in various ways :
On basis of similarity among physical and chemical properties of several groups of three elements , as done by Johann Dobereiner in early 1800’s .On basis of increasing atomic wieghts , as done by A.E.B. de Chancourtois in 1862 and english chemist, John Alexander Newlands in 1865.On basis of the physical properties such as atomic volume, melting point and boiling point against atomic weight as done by Lothar Meyer .On basis of atomic no. as done by the English physicist, Henry Moseley in 1913.Learn more about Sample of Elements table here https://brainly.com/question/15987580
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How many moles of CH3CH2Br are contained in 422 mL of 0.0950 M CH3CH2Br solution?
PLEASE HELP CHEMISTRY!!!! Will give brainiest
Show work pls.
2 moles of ZnO are produced if 1 mole of Zn and 2 moles of [tex]O_2[/tex] is required.
What are moles?A mole is defined as 6.02214076 × [tex]10^{23}[/tex] of some chemical unit, be it atoms, molecules, ions, or others. The mole is a convenient unit to use because of the great number of atoms, molecules, or others in any substance.
Balanced equation:
[tex]2 Zn + O_2[/tex] → [tex]2 ZnO[/tex]
For 2 moles of Zinc, we need 1 mol of Oxygen to produce 2 moles of Zinc oxide
For 1 mole Zn, we need 2 mol [tex]O_2[/tex] to produce 2 moles ZnO only.
Hence, 2 moles ZnO is produced.
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Which of the following is an unsafe lab behavior?
a. Wearing loose comfortable clothing so you can concentrate on the lab.
b. Tying back long hair so it stays in place.
c. Wearing close toe shoes.
d. Reading all instructions before beginning.
Answer: A. Wearing loose comfortable clothing so you can concentrate on the lab.
Explanation:
Wearing loose clothing can make it cling onto certain things, which could create a spill or a different hazard. B, C, and D are all things you SHOULD be doing to achieve safe lab behavior.
I hope this helps! Pls give brainliest!! :)
reaction of cysteine and NaOH
Answer:
cysteine is HOOC-CH--CH₂-SH
reaction with Naoh
HOOC-CH--CH₂-SH + Naoh ---->oh-oNH2-oh + H2o
Which of the following is a heterogeneous mixture?
a) milk
b) air
c) oil and vinegar
d) vinegar in water
Answer:
c) oil and vinegar
Explanation:
A heterogeneous mixture is a mixture that does not have a "uniform composition" (meaning that the entire mixture is not thoroughly mixed to be the exact same. In different parts of the mixture, there is a non-consistent / differing composition.)
Oil and vinegar, as you may know, do not thoroughly mix when put together--different parts of the mixture are made of different compositions. Some parts are made of oil, and some are a concentration of vinegar, but because they are not able to be mixed entirely, the mixture is considered a heterogeneous mixture. If you were to take different samples of different parts of the liquid, you would have a clear separation of oil and vinegar.
Milk is thoroughly milk--if you take out a tablespoon, it will be milk entirely--and it will have the same composition as all of the other milk in the bottle.
Air is complicated--and it can be described as either, but the question was likely intending the answer of oil and vinegar.
Vinegar and water do thoroughly mix. Vinegar absorbs water on a molecular level, so the mixture is thoroughly mixed when put together.
(Hope this helps!)
Number of molecules in .99 mol C6H5NO2
Answer:
5.96 * 10^23 molecules
Explanation:
Don't start counting up the number of CsHsNs and Os there are Counting up the atom ions will get a wrong answer. The question is asking for the number of molecules. That means you do not break down each molecule to find the number of molecules. You modify 1 mol to find out how many molecules are in 0.99 mols. Do that using a proportion.
1 mol contains 6.01 * 10^23 molecules
0.99 mol contains x
1/0.99 = 6.02 * 10^23 / x molecules
x = 0.99 * 6.02 * 10^23
x = 5.96 * 10^23
Which of the following hereditary conditions is characterized by abnormally shaped blood cells?
Acne
Heart disease
Sickle cell anemia
Type 1 diabetes
Answer:
Sickle cell anemia
Explanation:
is an inherited genetic abnormality of hemoglobin (the oxygen-carrying protein found in red blood cells) characterized by sickle (crescent)-shaped red blood cells and chronic anemia caused by excessive destruction of the abnormal red blood cells.
Answer:
Sickle cell
Explanation:
I just took the test and it was correct.
Compared to infrared radiation, an electromagnetic wave that has a lower frequency will also have a ________.
longer wavelength and lower speed
longer wavelength and equal speed
shorter wavelength and lower speed
shorter wavelength and equal speed
Compared to infrared radiation, an electromagnetic wave that has a lower frequency will also have a longer wavelength and equal speed
What is Electromagnetic wave ?Electromagnetic waves or EM waves are waves that are created as a result of vibrations between an electric field and a magnetic field.
It can be also defined as waves are composed of oscillating magnetic and electric fields.
One important feature fo electromagnetic radiation is that all have the same speed in vacuum, c, in vacuum, which is the speed of light.
Since, the speed, wavelength and frequency of the waves are related you can infere any of them when the other two are known.
The equation is:
speed = frequency × wavelength
s = ν × λ
c = ν × λ . . . for the specific case of electromagnetic radiation
That inverse relation between frequency and wavelength, where the speed is the constant, shows that the lower the frequency the longer the wavelength.
Therefore, the correct statment is that an an electromagnetic wave that has a lower frequency will also have a longer wavelength and equal speed (option B).
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In your own words, explain why a study published a cereal company that finds that breakfast is the most important meal of the day is likely to contain bias.
In the reaction of 675.9 grams of barium chloride and excess silver(I) nitrate, how many grams of silver(I) chloride should get formed?
i dont understand, show work pls ty
Taking into account the reaction stoichiometry, the mass of silver(I) chloride formed is 930.37 grams.
Reaction stoichiometryIn first place, the balanced reaction is:
2 AgNO₃ + BaCl₂ → 2 AgCl + Ba(NO₃)₂
By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:
AgNO₃: 2 moles BaCl₂: 1 moleAgCl: 2 molesBa(NO₃)₂: 1 moleThe molar mass of the compounds is:
AgNO₃: 169.87 g/moleBaCl₂: 208.24 g/moleAgCl: 143.32 g/moleBa(NO₃)₂: 261.34 g/moleThen, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:
AgNO₃: 2 moles ×169.87 g/mole= 339.74 grams
BaCl₂: 1 mole ×208.24 g/mole= 208.24 grams
AgCl: 2 moles ×143.32 g/mole= 286.64 grams
Ba(NO₃)₂: 1 mole×261.34 g/mole= 261.34 grams
Mass of silver(I) chloride formedThe following rule of three can be applied: if by reaction stoichiometry 208.24 grams of barium chloride form 286.64 grams of silver(I) chloride, 675.9 grams of barium chloride form how much mass of silver(I) chloride?
[tex]mass of silver(I) chloride=\frac{675.9 grams of barium chloride x286.64 grams of silver(I) chloride }{208.24 grams of barium chloride}[/tex]
mass of silver(I) chloride= 930.37 grams
Finally, the mass of silver(I) chloride formed is 930.37 grams.
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If heat is added to 25.0g of copper, calcium, aluminum, iron, lead what will have the highest final temperature
Lead will have the highest temperature .
What is Specific Heat ?
Specific Heat is defined as the amount of heat required to raise the temperature of a 1 gm of substance by 1 degree Celsius.
If heat is added to 25.0g of copper, calcium, aluminum, iron, lead
The missing given specific heat is
Copper, 0.377
Calcium, 0.656
Aluminum, 0.895
Iron, 0.448
Lead, 0.129
Higher specific heat means more temperature required to bring the same amount of change in temperature
Here the temperature change is fixed , The metal with the lowest Specific heat will have the highest temperature.
From the data it can be seen that
Specific Heat of Lead, 0.129
Therefore Lead will have the highest temperature.
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Step 5: Measure the Mass of the Water (Iron)
Tare the balance. Put calorimeter (no lid) on the balance.
Measure the mass to the nearest 0.01 g.
g
DONE✔
ZERO
Answer:
12.42 g
Explanation:
because I saw your laptop so it is
Different atoms and elementary particles have varied masses. Therefore, 12.42 g is the Mass of the Water.
What is mass?A body's mass is an inherent quality. Before the invention of the atom or particle physics, it was widely considered to be tied to the amount of matter inside a physical body. It was discovered that, despite having the same quantity of matter in theory, different atoms and elementary particles have varied masses.
There are various conceptions of mass in contemporary physics that are theoretically different but physically equivalent. The resistance of the body to acceleration in the presence of a net force can be measured experimentally as mass. 12.42 g is the Mass of the Water.
Therefore, 12.42 g is the Mass of the Water.
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Helium is which of the following types of matter?
element
mixture
molecule
compound
Answer:
element.....
it is in the periodic table
C6H12O6 + 6O2 → 6CO2 + 6H2O + energy
Carbon dioxide + Water Glucose (sugar) + Oxygen CO2 + H2O C6H12O6 + 6O2 Cellular respiration or aerobic respiration is a series of chemical reactions which begin with the reactants of sugar in the presence of oxygen to produce carbon dioxide and water as waste products.
