Avogadro's numbers are used to convert the moles, atoms, and molecules. There are 51.17 × 10²¹ molecules in 8.5 x 10⁻² moles of HF.
What is Avogadro's number?Avogadro's number converts the moles into molecules with the help of the value of the Avogadro's number as 6.02 x 10²³.
We know that 1 mole of HF has 6.02 x 10²³ molecules
Then, 8.5 x 10⁻² moles of HF will have:
(8.5 x 10⁻²) × 6.02 x 10²³ = 51.17 × 10²¹ molecules.
Therefore, 51.17 × 10²¹ molecules are present in 8.5 x 10⁻² moles of HF.
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current is created by the movement of what subatomic particle?
Answer:
I believe the answer is electrons.
Explanation:
Protons can't move and neurons don't have a charge so it would be electrons.
Perform the following
mathematical operation, and
report the answer to the
correct number of significant
figures.
0.97584/5.68 = [?]
The answer to the correct number of significant figures is 0.171.
What are the significant numbers?The numbers 1 to 9 will always be significant figures. Leading zeros of a number are not significant figures. Zeros to the right of a number are significant figures.
In this case we have:
[tex]0.97584/5.68 = 0.171[/tex]
So you only need the three numbers after the dot.
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smoking cigarettes is banned in petrol stations because of the risk of explosions.
Explain why Flames can cause explosions in petrol stations even if they never come into direct contact with any liquid petrol.
help pls!
Answer:
well it is because of mainly what we call reaction the petrol are highly reactive with the flames
A balloon contains 7.2 L of
He. The pressure is reduced
to 2.00 atm and the balloon
expands to occupy a volume
of 25.1 L. What was the initial
pressure exerted on the
balloon?
Given:
Unknown:
Formula:
Solution:
Final Answer:
Apply Boyles law
P1V1=P2V27.2(2)=25.1P214.4=25.1P_2P_2=0.57atmRemember
If Volume is four times increased pressure is 4 times decreased
differentiate between positive and negative deviation ~
[tex] \\ [/tex]
ty! :)
Answer:
positive deviation from raoults law means when the vapour pressure is higher than the solution is expected to exhibit e.g of one is the mixture of acetone and ethanol
negative deviation means that it is opposed to the total vapour pressure of the solution
Lab: Plate Boundaries and Movement Lab Report.
A Plate Boundaries and Movement Lab Report is a report that shows the records of all the data relating to the movement of Plate Boundaries and their movements.
What are Plates in this context?A tectonic plate is also described or referred to as a Lithosperic Plate. In Geography, it is described as a slab of rock that is not shaped regularly.
In most cases, it comprises continental and oceanic lithosphere.
Why is it crucial to record the movement of plates and their boundaries?Plate Boundaries and their movement are largely linked to volcanic activities and earthquakes. This means that they can be used to predict when any of the above-mentioned events may happen.
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How old is a piece of cotton cloth if the half-life of carbon-14 is 5,730 years, and the carbon-14 composition of the cloth is 22 percent that of living plants?
Question 1 options:
A)
1,813 years
B)
1.21 × 10-4 years
C)
12,517 years
D)
1.21 × 10-4 years-1
The half-life is the time used by the concentration to get half of its initial value. The cotton cloth is 5097 years old.
What is radioactive decay?Radioactive decay is the reduction of the initial concentration to the half value. The exponential decay can be given as:
[tex]\rm N(t) = N_{0}e ^{-\lamda t}[/tex]
The decay constant is calculated as:
[tex]\begin{aligned} \lamda &= \rm \dfrac {ln (2)}{t\frac{1}{2}}\\\\&= \dfrac{\rm ln(2)} {5730}\\\\&= 0.0001209\end{aligned}[/tex]
Solving further:
[tex]\begin{aligned}0.22 &= \rm e^{-0.0001209 \times t}\\\\\rm ln 0.22 &= -0.0001209 \times t\\\\\rm t &= \rm \dfrac{log 0.22}{-0.0001209}\\\\&= 5097 \;\rm years\end{aligned}[/tex]
Therefore, the cotton cloth is 5097 years.
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Which of the following is a nonrenewable resource: A- Hydropower, B- Biomass, C- Solar, and D- Petroleum
Answer:
D-Petroleum
Explanation:
because it takes millions of years to form petrol and it cannot be renewed again
Using the periodic table, which of the elements below would be a poor conductor of electricity, be a gas, and may have a color?
a. Zinc
b. Cobalt
c. Chlorine
d. Calcium
You have an unknown compound of Potassium derivatives (KIxOy). This sample contains 17.0g of potassium, and 27.8g of oxygen and 55.2g of iodine. If you prepared another sample, but this time it had 460.0g of potassium periodate, how much oxygen and iodine would you have in your sample?
Answer:
The body temperatures in degrees Fahrenheit of a sample of adults in onle small town are 96.6 99.6 96. 3 97.3 99.8 97.7 97,6 97.9 99.2 Assume body temperatures of adults are normally distributed Based on this data find the 9900 confidence Interval of the mean body temperature of adults in the town Enter Your answer as an Open-interval (i.e. parentheses) accurate to 3 decimal places. Assume the data is from normally distributed population_ 9900 CI = Previewv Tp Enter 4euleie er using intewval notation. Example: [2,5) Uge U fcr unicr to combine interval:, Example: (-00,2] U [4,00} Entet each Faluce nunber (like 33,2.2172) Or 33 calculztion (like 5/3,243 5-4) Enter DNE for ar empty set, Use 00 to enter Infinity. Enter each valze accurate to decial place: Get Help: Points possible: 10 This attempt of 3 Me ye ingtmctor absutthis questin Poelis quesivto 6 EpIC e 6 DeA
Explanation:
(Unsure if this helped but hope it did!)
460 grams of Potassium periodate contains 128 grams of Oxygen and 253.9 grams of Iodine.
What is a compound?A compound is composed of atoms from two or more different elements chemically bonded together in fixed small whole number ratios to each other.
Mass of potassium= 17.0 grams
Mass of Oxygen= 27.8 grams
Mass of Iodine= 55.2 grams.
Mass of Potassium periodate= Mass of Potassium+Mass of Oxygen+Mass of Iodine
Mass of Potassium periodate= 17g+27.8g+55.2g
Mass of Potassium periodate= 100 grams
Therefore, 100 grams of Potassium periodate contains 27.8 grams of Oxygen
1 gram Potassium periodate contains 27.8/100= 0.278 grams of Oxygen
So, 1×460= 460 grams Potassium periodate contains 0.278×460
=128 grams Oxygen
Now,
100 grams of Potassium periodate contains 55.2 grams of Iodine
1 gram of Potassium periodate contains 55.2/100=0.552 grams of Iodine
1×460=460 grams Potassium periodate contains 0.552×460
=253.9 grams of Iodine.
So, 460 grams of Potassium periodate contains 128 grams of Oxygen and 253.9 grams of Iodine.
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Why is electron configuration important
because it's provide insight into the chemical behaviour of elements by helping determine the valence electrons of an atom
that's my answer
Name the following carboxylic acid:
COOH
A. 3-ethyl-2-methylheptanoic acid
B. 2-ethyl-1-methylhexanoic acid
The name of the compound is 2-methyl-3-ethylheptanoic acid.
Naming organic compoundsLooking at the structure, the longest carbon chain is 7. Meaning that the compound is a heptanoic acid.
There are 2 branches. The first one has a single carbon (methyl) while the second one has 2 carbons (ethyl).
The methyl is located on the second carbon (2-methyl) while the ethyl is located on the third carbon (3-ethyl) on the main chain.
Thus, the name of the compound would be 2-methyl-3-ethylheptanoic acid.
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Answer:its c 3-ehtyl
Explanation:
# 12 of Equilibrium Constant
Consider the chemical system:
2 NO(g)
N₂(g) + O₂ (g)
K = 2.1 x 1030
How do the equilibrium concentrations of the reactant compare to the equilibrium concentration of the products?
Select one:
O a. They are much lower
O b. They are much higher
O c.
They are about the same order of magnitude
O d. They have to be exactly equal
e.
You can't tell from the information given
Answer:
of Equilibrium Constant
Consider the chemical system:
2 NO(g)
N₂(g) + O₂ (g)
K = 2.1 x 1030
How do the equilibrium concentrations of the reactant compare to the equilibrium concentration of the products?
Select one:
O a. They are much lower
O b. They are much higher
O c.
They are about the same order of magnitude
O d. They have to be exactly equal
e.
You can't tell from the information
Explanation:
of Equilibrium Constant
Consider the chemical system:
2 NO(g)
N₂(g) + O₂ (g)
K = 2.1 x 1030
How do the equilibrium concentrations of the reactant compare to the equilibrium concentration of the products?
Select one:
O a. They are much lower
O b. They are much higher
O c.
They are about the same order of magnitude
O d. They have to be exactly equal
e.
You can't tell from the information
Which of the following quantities represents the greatest volume?
A) 300 microliters
B) 3.0x106 nanoliters
C) 3.0x104 deciliters
D) 3.0x10-12 kiloliters
E) 3.0 milliliters
The lowest and largest conversion factors are nanoliters and kiloliters, respectively. Among all the given options, the correct option is option C.
What is volume?A liquid, solid, or gas's volume is the amount of three-dimensional space it occupies. Although there are many different units that may be used to indicate volume, the most common ones are liters, m³, gallons, milliliters, teaspoons, as well as ounces.
Gases have a volume equal to the internal capacity of the container since they fill their containers to the brim. Containers with a designated volume or one whose interior form is known are frequently used to measure liquids. Measuring cups, graded cylinders, flasks, as well as beakers are a few examples of the tools used to quantify liquid volume. 3.0x10⁻¹²kiloliters represents the greatest volume.
Therefore, the correct option is option C.
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How many liters of 4.000 M sodium bromide solution are needed to
make 0.250 L of 0.200 M sodium bromide?
When a solution is saturated, and additional solid solute is added, what happens?
Answer:
super saturation takes place.
Using the Equilibrium Solubility Constant
Some carbonate compounds have limited solubility.
MCO3(s) M²+ (aq) + CO3²- (aq)
The solubility constant Ksp for a carbonate compound MCO3, Ksp = 2.5E-7.
A saturated solution of the compound MCO3, is made.
Calculate the concentration of the ions M²+ (aq) and CO32-(aq) in the saturated solution (check the stoichiometry, the
ions will have the same concentration).
Give your answer to three significant figures, using the exponential format, example enter 0.0000382 as 3.82e-5
with no gaps and the -ve e if power is -ve.
Answer:
The solubility product constant (Ksp) describes the equilibrium between a solid and its constituent ions in a solution. The value of the constant identifies the degree to which the compound can dissociate in water. The higher the Ksp, the more soluble the compound is.
Answer:
MCO3(s) M2+(aq) + CO32-(aq) The solubility constant Ksp for a carbonate compound MCO3, Ksp = 2.83E-7. A saturated solution of the compound MCO3, is made.
Explanation:
A tank (not rigid) contains 2.3L of
helium gas at 25°C. What will be the
volume of the tank after heating it
and its content to 40°C temperature
at constant pressure?
Given:
Unknown:
Formula:
Solution:
Final Answer:
Convert
Temp to Kelvin25°C=298K40°C=313KApply Charles law
V1T2=V2T12.3(313)=298V2719.9=298V2V2=2.4LAnswer:
See below ~
Explanation:
Q1
Given :
V₁ = 2.3LT₁ = 25°C = 298 KT₂ = 40°C = 313 KUnknown :
V₂Formula :
V₁/T₁ = V₂/T₂ (Charles Law)Solution :
2.3/298 = V₂/313V₂ = 313/298 x 2.3V₂ = 1.05 x 2.3V₂ = 2.42 LFinal Answer :
2.42 LQ2
Given :
P₁ = 1.01 atmV₁ = 6 LV₂ = 3 LUnknown :
V₂Formula :
P₁V₁ = P₂V₂Solution :
1.01 x 6 = P₂ x 3P₂ = 1.01 x 2P₂ = 2.02 atmFinal Answer :
2.02 atmPlease help me answer this question...
[tex] \begin{gathered} \begin{array}{ |c|c| } \pmb{ \sf{Electrolyte}}& \textsf{ \textbf{Formula of Ions}}\\ \\ \\ \sf sodium \: sulphate& \bf \red{Na_2SO_4} \\ \\ \sf magnesium \: chloride& \red{ \bf MgCl_2} \\ \\ \sf zinc \: sulphate & \bf \red{ZnSO_4} \\ \\ \sf potassium \: iodine& \red{ \bf KI} \\ \\ \sf sodium \: hydroxide& \bf \red{NaOH} \\ \\ \sf Copper(II) \: chloride & \red{ \bf CuCl_2} \\ \\ \sf silver \: nitrate& \red{ \bf{AgNO_3}}\end{array}\end{gathered}[/tex]
[tex]\\\\\\[/tex]
Sodium sulphatevalency:
Sodium - [tex]\sf Na^+[/tex]
sulphate - [tex]\sf {SO_4}^{-2}[/tex]
Magnesium Chloridevalency:
Magnesium- [tex]\sf Mg^{+2}[/tex]
Chloride- [tex]\sf Cl^{-1}[/tex]
zinc sulphatevalency:
zinc- [tex]\sf Zn^{+2}[/tex]
sulphate [tex]\sf SO_4^{-2}[/tex]
potassium iodinevalency:
potassium - [tex]\sf K^{+1}[/tex]
sulphate - [tex]\sf I^{-1}[/tex]
sodium hydroxidevalency:
sodium - [tex]\sf Na^{+1}[/tex]
hydroxide - [tex]\sf OH^{-1}[/tex]
Copper(II) chloridevalency:
Copper(II) - [tex]\sf Cu^{+2}[/tex]
chloride - [tex]\sf Cl^{-1}[/tex]
Silver nitratevalency:
Silver - [tex]\sf Ag^{+1}[/tex]
nitrate - [tex]\sf NO_3^{-1}[/tex]
[tex]\\\\\\[/tex]
Key Points :
Remember metals always have positive valency because lose their electrons from their valence shell to obtain Nobel gas configuration. And bases always have negative valency because they gain electronics to complete their shell and hence to obtain Nobel gas configuration.Metals are always written before basesWhile writing formula if both Ions have same valency then we don't write them in formula.⭑━━━━━━━✵━━━━━━━⭑
❥ωเɳ∂ყ✞ɱเɳƭ࿐Describe the population density located along the tectonic plate boundary known as the Ring of Fire and the potential effect that earthquakes or volcanic
activity can have in this area.
(Pls no links)
Population density is the number of specific organisms living in a particular area. The tectonic plate movements in the Ring of Fire area can cause volcanic eruptions and earthquakes.
What are tectonic plates?Tectonic plates are the parts of the crust and the mantle of the earth layer that is also called the lithosphere plate. They are not stationary and have slight movements on the mantle which comprises the hot lava.
The movement of these tectonic plates in the area of the Ring of fire causes the eruption of the lava and disrupts the crust causing an earthquake. This consequence affects the life habiting them.
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Answer:
im pretty sure because the plates move which causes these natural disasters
Explanation:
4Na(s)=+O2(g)->2NA2)(s)
How many grams of Na2O is produced when 57.5g an Na reacts
What is the molarity of Na, SO, if you have 5 mol in 2.5 L?
Are cable wires made of thermoplastic? If so why?
(This is just a doubt that just came into my head)
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Cable wires are usually made of of thermoplastics because, current passing through the wire has heating effects as well, due to collision of electrons in the conducting wire. so to avoid the melting of normal wire which can break the circuit, Thermoplastics are used, that doesn't have much effect of heat on them.
What type of reaction is the following?
H₂O ---> H₂ + O
[tex] \boxed{ \frak{Answer }}[/tex]
It's decomposition reaction.
[tex] \sf{Explanation}[/tex]
In decomposition reaction, a compound breaks into simpler form on heating.As, we can see in the above reaction, [tex] H_{2} O[/tex] is broken down into [tex] H_{2} [/tex] and [tex] O_{2} [/tex].
Hence it is a decomposition reaction.[tex] \boxed{ \frak{Be \: Brainly}}[/tex]
[tex] \boxed{ \frak{Keep \: Learning}}[/tex]
-
Solution 1: 0.1 M - Dim Light Solution 2: 0.1M - Bright
Bulb
Which solution from the data table most likely contains a strong acid?
A. Solution 1 is a strong acid due to a large number of dissociated ions.
B. Solution 1 is a strong acid due to a small number of dissociated ions.
C. Solution 2 is a strong acid due to a large number of dissociated ions.
D. Solution 2 is a strong acid due to a small number of dissociated ions.
Answer:
: The conductivity of electrolyte solutions: (a) 0.1 M NaCl (b) 0.05 M NaCl (c) 0.1 M HgCl2. An electrolyte solution conducts electricity because of the movement of ions in the solution (see above). The larger the concentration of ions, the better the solutions conducts. Weak electrolytes, such as HgCl2, conduct badly because they produce few ions when dissolved (low concentration of ions) and exist mainly in the form of molecules.
Explanation:
what is the formula to find the volume of a marble
Individual marble:
4/3_?_ R^3Answer:
Individual Marble
Use the formula 4/3_?_ R^3, to solve for the volume. Here, R is the radius, or half of D. ^3 means the radius is cubed.
Explanation:
Calculate the molarity of 0.060 moles NaHCO3 in 1500. mL of solution
Answer:
= 0.4 M
Explanation:
data:
moles = 0.060 moles
volume = 1500 ml
= 1500 / 1000
= 1.5 dm^3
solution;
molarity = [tex]\frac{no. of moles}{volume in dm^3}[/tex]
= 0.060 / 1.5
molarity = 0.4 M
In a spacecraft tge carbon dioxide exhaled by the astronaut can be removed by the reaction with lithium hydroxide, LiOH according to the following; CO2(g) + LiOH(g) = LiOH(s) + H2O(l) how many moles of Lithium hydroxide are required to react with 30 moles of CO2, average exhaled by each person
Answer:
30 moles
Explanation:
From the equation it is a one - to - one reaction
How many significant figures
are in this number?
0.00521
The significant figures in the number 0.00521 is : 3 Significant figures.
Meaning of significant figuresSignificant figure can be defined as numbers within the number system that has value or gives value to a number list.
Significant figures are numbers that has a measure of value assigned to them as a reason of where they are placed.
In conclusion, the number above contains only three significant figures.
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Which of the following indicates an endothermic reaction? I will mark as brainliest if correct.
Answer:
A + B → C + D + heat
Explanation:
A. A+B+heat⇒C+D
In an endothermic reaction, the system requires energy/heat, the enthalpy change is positive.