Explanation:
[tex]pH = - log[H {}^{ + } ] \\ = - log(5.6 \times {10}^{ - 4} ) \\ = 3.25[/tex]
what is the mass of 1.5 x 10^21 silicon atoms?
Answer:
0. 070g
Mass of 1 Si atom =28.08/6.022*1023
So mass 1.5 *1021*4.6629*10-23
Answer:
[tex]\boxed {\boxed {\sf 0.070 \ g \ Si}}[/tex]
Explanation:
We are given a value of atoms and asked to find the mass. We can complete this in 2 steps.
1. Convert Atoms to Moles
First, we have to convert atoms to moles. We use Avogadro's Number or 6.022 × 10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance.
In this case, the particles are silicon atoms. We can set up a proportion.
[tex]\frac { 6.022 \times 10^{23} \ atom \ Si }{1 \ mol \ Si}[/tex]
Multiply by the value of atoms given.
[tex]1.5 \times 10^{21} \ atom \ Si *\frac { 6.022 \times 10^{23} \ atom \ Si }{1 \ mol \ Si}[/tex]
Flip the ratio. This allows the atoms of silicon units to cancel and leave the moles of silicon.
[tex]1.5 \times 10^{21} \ atom \ Si *\frac {1 \ mol \ Si } {6.022 \times 10^{23} \ atom \ Si}[/tex]
[tex]1.5 \times 10^{21}*\frac {1 \ mol \ Si } {6.022 \times 10^{23} }[/tex]
[tex]\frac {1.5 \times 10^{21} \ mol \ Si } {6.022 \times 10^{23} }[/tex]
[tex]0.002490866822 \ mol \ Si[/tex]
2. Convert Moles to Grams
Next, we convert the moles to grams. We use the molar mass, which is found on the Periodic Table. This value is the number of grams in 1 mole of a substance. Look for silicon (Si).
Si: 28.085 g/molUse this value as a ratio.
[tex]\frac {28.085 \ g \ Si}{1 \ mol \ Si}[/tex]
Multiply by the number of moles we calculated.
[tex]0.002490866822 \ mol \ Si *\frac {28.085 \ g \ Si}{1 \ mol \ Si}[/tex]
The moles of silicon units cancel, so we are left with grams.
[tex]0.002490866822 *\frac {28.085 \ g \ Si}{1}[/tex]
[tex]0.002490866822 *{28.085 \ g \ Si}[/tex]
[tex]0.06995599469 \ g \ Si[/tex]
3. Round
Finally we must round our answer. The original value has 2 significant figures, so our answer must have the same. For the number we calculated, that is the thousandth place.
[tex]0.069\underline95599469 \ g Si[/tex]
The 9 tells us to round the other 9 to a 0, then the 6 to a 7.
[tex]0.070 \ g \ Si[/tex]
The mass of 1.5 × 10²¹ silicon atoms is 0.070 grams of silicon.
Please help !!! (no links or ill report)
there is a large range of rock ages in the ocean floor due to seafloor spreading, where are the youngest rocks found?
A ) Underneath the continental plate.
B ) Far from the plate boundary/ridge
C ) On the plate boundary/ridge
D ) In the subducton zone
A group of students working in a high school chemistry lab believe they have discovered a new element! How exciting! Upon further testing by scientists (with better equipment), it is found that the new element contains 74 protons and 110 neutrons.
I NEED HELP WITH THIS ASAPP
temperature usually increase when water condenses which behavior of water is most directly responsible for this phenomenon?
Answer:
Temperature usually increases when water condenses. What behavior of water is most directly responsible for this phenomenon? The release of heat by the formation of hydrogen bonds. Hydrogen bonds stabilize and keep the of ice farther apart than the water molecules of liquid water.
3. If you wish to make 500.0 mL of 0.150 M HCl solution from 6.00 M HCl stock solution, what volume of the stock would you need?
4) if 50.00 mL of 0.300 M AgNO3 are diluted to 250.0 mL, what is the concentration of the new solution?
Answer:
3. 12.5 mL
4. 0.06 M
Explanation:
3. Determination of the volume of stock solution.
Volume of diluted solution (V₂) = 500 mL
Molarity of diluted solution (M₂) = 0.150 M
Molarity of stock solution (M₁) = 6 M
Volume of stock solution needed (V₁) =?
M₁V₁ = M₂V₂
6 × V₁ = 0.150 × 500
6 × V₁ = 75
Divide both side by 6
V₁ = 75 / 6
V₁ = 12.5 mL
Thus, the volume of the stock solution needed is 12.5 mL
4. Determination of the molarity of the diluted solution.
Volume of stock solution (V₁) = 50 mL
Molarity of stock solution (M₁) = 0.3 M
Volume of diluted solution (V₂) = 250 mL
Molarity of diluted solution (M₂) =?
M₁V₁ = M₂V₂
0.3 × 50 = M₂ × 250
15 = M₂ × 250
Divide both side by 250
M₂ = 15 / 250
M₂ = 0.06 M
Thus, the concentration of the diluted solution is 0.06 M
Classify the following as a chemical or
physical property:
Sodium metal boils at
883 degrees C.
A.chemical
B.physical
please help illl mark brainlst (no links)
seafloor spreading allows the new formation of rock by:
A ) New rocks floating to the surface of the crust.
B ) The oceanic plates hit each other causing new rocks to fall off.
C ) Magma cooling on the crust.
D ) Seafloor spreading does not create new rocks.
Answer:
A ) New rocks floating to the surface of the crust.
TRUST
CaCO3 For each of the following compounds, decide whether the compound's solubility in aqueous solution changes with pH. If the solubility does change, pick the pH at which you'd expect the highest solubility. You'll find data in the ALEKS Data tab. compound Does solubility change with pH? highest solubility pH = 5 pH = 6 pH = 7 yes no yes no yes no g
Answer:
Hello attached below is the data found in Aleks Data tab
answer :
i) N0
ii) N0
iii) YES , pH of highest solubility = 5
Explanation:
i) For CuBr
solubility does not change with pH hence answer = NO
ii) For MgCl2
solubility does not change with pH hence the answer = NO
iii) For Ba(OH) 2
Solubility does change with pH hence the answer = YES
and the pH at which the highest solubility will occur is = 5
attached below is the reason for the answers given
What is the mass in grams of 5.90 mol CH?
Answer:
77.173g
Explanation:
we have been given the number of moles contained in CH thus we can find the molar mass of CH and then calculate for the mass
what is the formula for tin(III) sulfate
Answer:
SnSO₄
Explanation:
Tin(II) sulfate is a chemical compound. It is a white solid that can absorb enough moisture from the air to become fully dissolved, forming an aqueous solution; this property is known as deliquescence.
Answer:
please give me brainlist and follow
Explanation:
SnSO₄
b) A piece of solid gold was heated from 274K to 314K using 55.7J of energy to raise the
temperature. What mass of gold was present?
Answer:
Explanation:
So we know q = mc[tex]\Delta[/tex]T.
q = 55.7 J
c = 0.129j/g°C
and [tex]\Delta[/tex]T = 314-274 = 40°C.
and m is mass which can solve since we got every other variable. We will get m = 10.8g.
(a) Using the expression Ka=[H+][A−][HA] , explain how to determine which solution has the lower pH , 0.10MHF(aq) or 0.10MHC2H3O2(aq) . Do not perform any numerical calculations.
Answer:
Ka=[H+][A−]/[HA]
which solution has the lower pH, 0.10MHF(aq) or 0.10MHC2H3O2(aq) :
Higher value of Ka indicates greater ionization thus more protons in solution, higher H+ concentration in solution means lower pH value.
Since HF have higher Ka have, thus HF solution will have lower pH.
The measurement is when the solution has the lower pH so HF should have higher ka.
Measurement when the solution has the lower pH?In the given solution, it contains the lower pH, 0.10MHF(aq) or 0.10MHC2H3O2(aq).
Here higher value of Ka represents the high ionization so there should be more protons in the solutions. and, the higher h+ concentration have the lower pH value.
So in the case when HF has higher Ka, due to this, HF solution will have lower pH.
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Please I will give branliest. The question is in the photo
Answer:
a. Br2(I)+2 KI(aq)》2KBr(aq)+I2
1) The Specific Heat Capacity at 25°C of Gold is 0.129 / (g°C)
a) What is the molar Specific Heat Capacity of Gold in J/(mol °C)
Answer:
25.4 J/mol
Explanation:
The specific heat of any substance is referring to the amount of energy required to raise 1 gram of that substance 1 degree kelvin. Molar heat capacity is referring to the amount of energy required to raise 1 mole of that substance 1 degree kelvin. So in order to solve for molar heat capacity of gold we must convert from grams of gold to moles of gold.
( 0.129 J /g) ( 196.97 g/ m o l ) = 25.4 J m o l
196.97 is the molar mass of gold which can be found on the Periodic Table of Elements. Because grams are located on both sides of the denominator they cancel out leaving us with our new units of J/mol.
What do you plan to do this weekend !
( Giving out Branliest ) <3
Answer:
Go to the pool , Bake, sleep, Watch ,Movies, go out with my freinds<3
Explanation:
Cacti and succulents are better adapted
for surviving in the desert than oak
trees because cacti
A. allow more sunlight to reach the soil
B. prevent the plant from producing
flowers
c. encourage the release of carbon
dioxide from the stems
D. reduce the amount of water lost
through evaporation
Q1
Answer:
answer is C
Explanation:
encourage the release of carbon dioxide from the stems
Learning Task 3: Choose the letter of the correct answer to complete the
statement. Write your answer on your notebook.
a.
1.
is the oldest form where an image is transferred from
one surface to another.
a. Painting
b. Drawing
C. Printmaking
2. Screen frame commonly made of
covered tightly with
a mesh.
Wood
b. Plastic
C. Paper
3.
technique makes use of woven mesh to support an ink-
blocking stencil
a. Silkscreen printing
b. Intaglio printing
c. Photo emulsion printing
4 .
A tool that usually made of vinyl or rubber blade is called
a. Mesh
b. Squeegee
C. Emulsion
The oldest form where an image is transferred from one surface to another is printmaking, Screen frame commonly made of covered tightly with wood, technique makes use of woven mesh to support an ink blocking stencil is Silkscreen printing and A tool that usually made of vinyl or rubber blade is called Squeegee.
What is art?Art is a technique in which we use different kinds of things like paintings, printings, drawings and do exhibition for the decoration purpose.
Print is the oldest art form where an image is transferred from one surface to another surface by applying liquid material on one surface and get the print of that on another surface.Screen frames are generally about 70% of the content of wood material.Silk screen painting is used to transfer ink onto a object, leaving areas made impermeable to the ink by a blocking stencil.In the squeegee paintings, a scrapping implement is used which is made up of rubber blade and vinyl and known as squeegee.Hence C, A, A and B is the correct answers of the given questions.
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Opinión personal sobre El Planeta
la tierra nuestro planeta es el único del sistema solar que sabe que mantiene vida: vida que es increíblemente diversa,
Identify the correct equilibrium constant expression
for this equation:
C6H1206(s) + 60,(g) <—>6C02(g)+ 6H2O(g)
Answer: Keq= [CO2]^6[H2O]^6/ [O2]^6
Explanation:
The correct equilibrium constant expression for this equation C6H1206(s) + 60,(g) <—>6C02(g)+ 6H2O(g) will be
keq = 6[co2] 6[h2o] / [c6h1206] 6[o].
What is the equilibrium constant?All reactions tend towards the state of chemical equilibrium. It is the point at which both the forward process and the reverse process are taking place at the same rate.
Since the forward and reverse rates are equal, hence the concentrations of the reactants and products will be constant at the equilibrium state. Here, it is important to remember that even though the concentrations are constant at equilibrium.
The double half-arrow sign we use for writing the reversible reaction equations. It is represented as ⇌ a sign of equilibrium.
therefore, the correct equilibrium constant expression will be C6H1206(s) + 60,(g) <—>6C02(g)+ 6H2O(g)
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#SPJ2
A chemist makes 380. mL of magnesium fluoride (MgF2) working solution by adding distilled water to 20.0 mL of a 18.8 L stock solution of magnesium fluoride in water.
Calculate the concentration of the chemist's working solution.
Round your answer to 3 significant digits
Answer:
0.99 μmol/L
Explanation:
From the question given above, the following data were obtained:
Volume of stock solution (V₁) = 20 mL
Concentration of stock solution (C₁) = 18.8 μmol/L
Volume of diluted solution (V₂) = 380 mL
Concentration of diluted solution (C₂) =?
The concentration of the diluted solution can be obtained as follow:
C₁V₁ = C₂V₂
18.8 × 20 = C₂ × 380
376 = C₂ × 380
Divide both side by 380
C₂ = 376 / 380
C₂ = 0.99 μmol/L
Therefore, the concentration of the diluted solution the chemist is working on is 0.99 μmol/L
A beaker contains 0.125 L of a 3.00 M solution. If the volume goes up to 0.325 L, what is the new molarity?
Answer:
1.15 M
Explanation:
Step 1: Given data
Initial volume (V₁): 0.125 LInitial concentration (C₁): 3.00 MFinal volume (V₂): 0.325 LFinal concentration (C₂): ?Step 2: Calculate the final concentration of the solution
We want to prepare a dilute solution from a concentrated one by adding water. We can calculate the concentration of the dilute solution using the dilution rule.
C₁ × V₁ = C₂ × V₂
C₂ = C₁ × V₁/V₂
C₂ = 3.00 M × 0.125 L/0.325 L = 1.15 M
The table shows characteristics of two plants, Plant A and Plant B.
Answer:
Plant A
Explanation:
Due today! Why is it a good idea to have floating cities?
A: We are running out of land
B: We need it for pollution cleanup
C: Oceans are rising
D: It's a sustainable way to live
Answer:
in my opinion I think the answer the be "A"
How many moles is 30 grams of CO2?
Answer:
68
Explanation:
Although the Devil's Finger Fungus looks much like a plant, it is classified
in the kingdom Fungi. Which is a characteristic of fungi that is not found
in organisms of the plant kingdom?
Select one:
О
Their cells have a nucleus
O
They are heterotrophic
O
Their cells have cell walls
о
The are multicellular
Answer:
O the multicellular
Explanation:
sana nakatulong
Given all properties are present in both plant kingdom as well as on fungi kingdom species.
What are cells?Cells are the functional and fundamental unit of any organism which may be they are from plants and animals.
In the fungi kingdom and plant kingdom, both species will have nucleus in their cells and they also have multi cells in their structure only except yeast and it belongs from fungi family. Cell are covered by the cell walls and they both are heterotrophic in nature.
Hence given all properties are present in both species.
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What is the reaction of Dimethylamamine + acetic acid
If the number of moles of a gas doubles, its volume will also double
according to
*
Please hurry! What is the answer to this?
Explanation:
Boyle's Law
A chemist titrates 0.200 M NaOH, strong base, with 50.00 ML of 0.150 M HCI, strong acid. How many mL of NaOH will be required to titrate to the endpoint
[tex](normality \: of \: acid)×(volum \: of \: acid) = (normality \: of \: base)×(volum \: of \: base)[/tex]
0.15N × 50mL = 0.2N × (Vbase)
75mL = Volum of base
37.5mL of NaOH will be required to titrate 0.200 M NaOH, strong base, with 50.00 ML of 0.150 M HCI, strong acid to the endpoint.
How to calculate volume?The volume of a solution can be calculated using the following formula:
C1V1 = C2V2
Where;
C1 = initial concentrationC2 = final concentrationV1 = initial volumeV2 = final volumeC1 = 0.200MC2 = 0.150MV1 = ?V2 = 50mL0.2 × V1 = 0.150 × 50
0.2V1 = 7.5
V1 = 7.5/0.2
V1 = 37.5mL
Therefore, 37.5mL of NaOH will be required to titrate 0.200 M NaOH, strong base, with 50.00 mL of 0.150 M HCI, strong acid to the endpoint.
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lime juice turn blue limus paper what colour
Answer:
Red
Explanation:
Lime Juice is acidic which means it would turn the blue litmus paper red
Answer:
red, Lime juice is acidic in nature so it can turn blue litmus paper to red while the alkaline solution can turn the red litmus paper blue.
Explanation:
hope this helps