B. 0.21 mol
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
1.25 × 10²³ atoms Ca
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 1.25 \cdot 10^{23} \ atoms \ Ca(\frac{1 \ mol \ Ca}{6.022 \cdot 10^{23} \ atoms \ Ca})[/tex]Multiply: [tex]\displaystyle 0.207572 \ mol \ Ca[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
0.207572 mol Ca ≈ 0.208 mol Ca
Alex rode her skateboard to the library. Her velocity changed from 2 m/s west
to 6 m/s west in 10 seconds. What was her acceleration?
A. 40 m/s2 west
B. 0.4 m/s2 west
C. 4 m/s2 west
D. 10 m/s2 west
SUBMIT
Answer:
0.4 m/s2 towards the West.
Explanation:
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what is the chemical formula for hydrogen phosphate
Answer:
Explanation:
The chemical formula for hydrogen phosphate is HPO₄²⁻
Select the correct answer.
How are ionic bonds formed?
A.
by the disintegration of one or more electrons
B.
by the sharing of one or more electrons between two atoms
C.
by the transfer of one or more electrons from one atom to another
D.
by the disintegration of one or more protons
Answer: b
Explanation:
A substance joined by this type of bond will conduct electricity when in?
Answer:
C.) If the solid is conductive, the bonds are metallic.
1) Substances with ionic bond conduct an electric current in liquid, but not in solid state, because in liquids ions are mobile, contrary to solids where ions are fixed.
2) Substances with covalent bond not conduct an electric current in liquid and solid state, because they not have free ions or electrons.
3) Substances with metallic bond conduct an electric current in liquid and solid state, because they have mobile electrons. Most metals have strong metallic bond, because strong electrostatic attractive force between valence electrons (metals usually have low ionization energy and lose electrons easy) and positively charged metal ions.
Explanation:
How could solar flares affect the Earth's communication?
Answer:Solar flares have been known to affect electronic communication because their energy stirs up the Earth's upper atmosphere.
Explanation:
Click an item in the list or group of pictures at the bottom of the problem and, holding the button down,
correct position in the answer box. Release your mouse button when the item is place. If you change you
the item to the trashcan. Click the trashcan to clear all your answers.
Simplify by expressing fractional exponents instead of radicals.
y
12345678910
1 + xy + 12 13
4 15 16 17 18
9 10
abx
=
NEXT QUESTION
ASK FOR HELP
Answer:
X¹/⁴ Y¹/²
Explanation:
From the question given above, we are required to simplify:
⁸√(X²Y⁴)
The above expression can be simplified as follow:
⁸√(X²Y⁴)
Recall:
ⁿ√Aᵐ = Aᵐ/ⁿ
Therefore,
⁸√(X²Y⁴) = X²/⁸ Y⁴/⁸
⁸√(X²Y⁴) = X¹/⁴ Y¹/²
Thus, ⁸√(X²Y⁴) is equivalent to X¹/⁴ Y¹/²
Please help me ASAP I’ll mark Brainly thank you
Answer:
A higher hill will give more potential energy, and a lower hill will give less.
Explanation: Gravitational potential energy is the energy stored in an object based on its height and mass. The potential energy in an object increases as its elevation increases.
Air resistance prevents the driver from moving in a straight line once she jumps from the platform.
True or False
Answer:
true
Explanation:
choose all the following that are properties of gases
Answer:
compressible.
definite volume.
low density.
indefinite shape.
Someone please help me
Answer:
ELECTROMAGNETIC MICROSCOPEExplanation:
I HOPE IT HELPS :)
Newton's third law states that for every action, there is an ______ and ____ reaction force and that forces come in ____
Answer:
Newton's third law of motion states that every action, there is an equal and opposite reaction force and that forces come in pairs
group 1 elements tend to react with group ___ elements to form ___
Answer:
Group 1 elements tend to react with group Group 17 elements to form alkyl halide.
This is a measure of mass per unit volume.
Answer:
Density
Explanation:
Density is defined as the mass per unit volume. It is the ratio between the mass and the volume of a substance. It does not matter how large or small a sample of matter is, the same substance will always have the same density, because of this. The ratio between the mass and volume remains the same.
25.1 g express as an integer
Answer:
25 g
Explanation:
Integers are positive or negative whole numbers together with zero. This definition implies that 25.1 g is not an integer.
Seeing that .10 is less than .50, we have to round 25.10 down to 25.
Hence, if i express 25.10g as an integer, i end up with 25 g
How are humidity and relative humidity different?
Relative humidity is the percentage of what it can hold. Humidity is the measure of the amount of water vapor it can hold.
hope this helps ^^
It takes to break a carbon-iodine single bond. Calculate the maximum wavelength of light for which a carbon-iodine single bond could be broken by absorbing a single photon.
Answer:
502.9 nm
Explanation:
Energy to break to the bond of carbon-iodine is not given assuming it to be 238KJ/mol
we know that
ΔE= hυ
also, υ= c/λ
therefore λ = hc/ΔE
[tex]= \frac{6.626\times10^{-34}\times3\times10^8}{238\times10^3}\\=0.08352\times10^{-29} m mol[/tex]
also, 1 mol = 6.022×10^23 atoms or molecules
[tex]\lambda= 0..08352\times10^{-29}\times6.022\times10^{23}\\=502.9 \times10^{-9}m\\=502.9 nm[/tex]
I NEED THIS TODAY, PLEASE HELP.
Write the following elements in decreasing ionic size. Li+, C4+, F-, O2-
70 POINTS
Answer:
Li+, C4+, O2-, and then F- They're written in decreasing ionic size.
Explanation:
Ionic size means the same thing as ionic radius. Furthermore, Ionic radius is the distance away from the central atom. Ionic radius increases going from top to bottom and decreases across the periodic table.
Lithium is in the 1st family/group with a charge of +1. So it has the biggest ionic radius.
Carbon is in the 4th family/group with a charge of +4. So it has a smaller ionic radius than Lithium.
Oxygen is in the 6th family/group with a charge of -2. So it has a smaller ionic radius than Carbon.
Lastly, Fluorine is in the 7th family/group with a charge of -1. So it has a smaller ionic radius than Oxygen.
Iron reacts with oxygen to produce iron oxide rust this reaction is representative in an equation as to FE plus XO22FE203 identify the value of X that will balance this equation
The balanced equation :
4Fe + 3O₂⇒ 2Fe₂O₃
Further explanationGiven
Rust reaction
Required
Balanced equation
Solution
Reaction
Fe + O₂⇒ 2Fe₂O₃
For a simple equation where one of the reaction coefficients is known, we can immediately add the corresponding coefficient using the principle that the number of atoms of the components in the reactants and products is the same.
In the above reaction :
Fe, left=1, right = 4, so coefficient in the left=4
O, left=2, right = 6, so coefficient in the left=3
A chemist must prepare 575.mL of 1.00M aqueous sodium carbonate Na2CO3 working solution. He'll do this by pouring out some 1.58M aqueous sodium carbonate stock solution into a graduated cylinder and diluting it with distilled water. Calculate the volume in mL of the sodium carbonate stock solution that the chemist should pour out. Round your answer to 3 significant digits.
Answer : The volume in mL of the sodium carbonate stock solution is 364 mL.
Explanation :
According to dilution law:
[tex]M_1V_1=M_2V_2[/tex]
where,
[tex]M_1[/tex] = molarity of aqueous sodium carbonate
[tex]M_2[/tex] = molarity of aqueous sodium carbonate stock solution
[tex]V_1[/tex] = volume of aqueous sodium carbonate
[tex]V_2[/tex] = volume of aqueous sodium carbonate stock solution
Given:
[tex]M_1[/tex] = 1.00 M
[tex]M_2[/tex] = 1.58 M
[tex]V_1[/tex] = 575 mL
[tex]V_2[/tex] = ?
Now put all the given values in the above formula, we get:
[tex]1.00M\times 575mL=1.58M\times V_2[/tex]
[tex]V_2=363.92mL\approx 364mL[/tex]
Therefore, the volume in mL of the sodium carbonate stock solution is 364 mL.
Calculate the average rate of decomposition of NH4NO2 by the reaction 2NH4O5(aq) --> N2(g) H2O(g) at the following time interval. At time 250 s, the concentration of NH4NO2 is 4.12 M. At time 330 s, the concentration of NH4NO2 is 1.48 M
Answer:
[tex]r=-0.033\frac{M}{s}[/tex]
Explanation:
Hello!
In this case, since the average rate of reaction is computed as a change given by:
[tex]r=\frac{\Delta [NH_4NO_2 ]}{\Delta t}[/tex]
In such a way, given the concentrations at the specified times, we plug them in to obtain:
[tex]r=\frac{(1.48M-4.12M)}{(330s-250s)}\\\\r=-0.033\frac{M}{s}[/tex]
Whose negative sign means the concentration decreased due to the decomposition.
Best regards!
Please help with this assignment!
Answer:
im pretty sure 18 is eye
Explanation:
2. A quantity of 1.922g of methanol (CH3OH) was burned in a constant-volume
bomb calorimeter. Consequently the temperature of the water rose by 4.20C.
If the heat capacity of the bomb plus water was 10.4KJ/C, calculate the molar
heat of combustion of methanol.
1. Calculate the mass of the product, if you started with 4 g of Zn and 3 g of H2CO3.
Zn + H2CO3
ZnCO2 + H2 * I’ll cash app for the right answer plus explanation”
Answer:
6.07 g.
Explanation:
Hello!
In this case, given the chemical reaction:
[tex]Zn + H_2CO_3 \rightarrow ZnCO_3 + H_2[/tex]
We first need to compute the moles of each reactant considering their molar masses:
[tex]n_{Zn}=4gZn*\frac{1molZn}{65.38 gZn} =0.0612molZn\\\\n_{H_2CO_3}=3gH_2CO_3*\frac{1molH_2CO_3}{62.03 gH_2CO_3} =0.0484molH_2CO_3[/tex]
Now, compute the mass of zinc carbonate yielded by each reactant in order to pick out the correct limiting reactant:
[tex]n_{ZnCO3}^{by\ Zn} = 0.0612molZn*\frac{1molZnCO3}{1molZn}*\frac{125.4 gZnCO3}{1molZnCO3}=7.67gZnCO3 \\\\n_{ZnCO3}^{by\ H_2CO3} = 0.0484molH_2CO3*\frac{1molZnCO3}{1molH_2CO3}*\frac{125.4 gZnCO3}{1molZnCO3}=6.07gZnCO3[/tex]
Thus, we conclude carbonic acid is the limiting reactant as it produces the fewest grams of product and therefore the yielded mass of zinc carbonate product 6.07 g.
Best regards.
how does the electron configuration of sulfur end
Is it easier for an atom to lose a proton or a neutron?why or why not
will brain list
Answer:
No
Explanation:
It is not easier for an atom to lose a proton or a neutron because these particles are held together by very strong nuclear forces within the atom.
Protons are positively charged particles
Neutrons do not carry any charges.
In the nucleus of an atom, both protons and neutrons can be found.
As with both particles, the very strong attractive force makes them very difficult to remove in ordinary chemical reactions.
Nuclear forces are one of the strongest forces that keeps an atom especially the nucleus together. Only in nuclear reactions to we encounter a situation where nuclear materials are changed, in that regard the properties of the atom also changes.
What relationships between temperature and viscosity of water?
Answer:
As the temperature heats up then the viscosity is much higher, as defined in stress analysis and fluid mechanics. Reynolds number describes the speed and the inverse proportion.
what type of chemical reaction is (a) Vinegar in diluted water?
Answer: When water is added to vinegar, the vinegar's acidity decreases, which results in a higher number on the pH scale. However, diluting vinegar with water can never make it alkaline, because water itself is not alkaline; the pH of the mixture can't be higher than the higher pH value of the two components.
Explanation: it loses acidity. Diluting it can never make it alkaline and the PH mixture can’t be higher.
An organism that has two different alleles for a trait is known as?
Answer:
heterozygous
Please help!!! I’ll mark brainlist
Which statement describes a similarity between asexual reproduction and sexual reproduction?
A.) Both processes involve fertilization.
B.) Both processes involve cell division.
C.) Both processes produce genetically identical offspring.
D.) Both processes require two parents.
Answer:
the answer to the question is B!