Answer:
The second option
Explanation:
Hello! Can someone tell me how fans function and work? And what fans do? Ill include an imagine below! Best answer gets brainliest
Answer:
How fans work....Instead of sucking in hot air and pushing it down, the fan sucks up cool air and pushes it higher. When the fan forces cool air higher, the cool air forces warm air down. Instead of giving you more access to cool air in your room, the fan gives you more access to the warm air, making you feel nice and cozy.
What fans do....A fan, or a breeze, helps by replacing this hot, humid air with cooler, drier air that allows for more evaporation. Similarly, even without sweat, our body loses heat to the surrounding air simply by convection. ... The breeze from the fan carries that hot air away and perpetuates the process, effectively cooling you off.
Explanation:
a container holds four times as many moles of CO2 as O2. if the total pressure in the container is 20. atm, what is the pressure exerted by carbon dioxide?
Answer:
The answer is "16"
Explanation:
In the question given, it asks about the partial carbon dioxide (\(CO_2\)) pressure, which is directly related to the oxygen (\(O_2\)) to carbon dioxide (\(CO_2\)) mole ratio, which is 1 to 4.
Do you Believe in soulmates why or why not
Answer:
I do because there are certain people that are right for you. If there was no such thing as soulmates, you could just get with anyone and it wouldnt matter. You dont just fall in love with anyone. You may mistake love for something else. But when you're in love you'll know. Twin flames are not the same. Some people mistake twin flames with soulmates. They are close but not so much in a way.
Explanation:
Answer:
Ye
Explanation:
A mixture of BaCl2 and NaCl is analyzed by precipitating all the barium as BaSO4. After addition of an excess of Na2SO4 to a 3.656-g sample of the mixture, the mass of precipitate collected is 1.658 g. What is the mass percentage of barium chloride in the mixture
Answer:
\(\% m=40.46\%\)
Explanation:
Hello there!
in this case, according to the given information, it turns out firstly necessary for us to write up the chemical equation as shown below:
\(BaCl_2+Na_2SO_4\rightarrow BaSO_4+2NaCl\)
Thus, we calculate the mass of BaCl2 stoichiometrically related to the produced 1.658 g of precipitate in order to discard it from the sample:
\(m_{BaCl_2}=1.658gBaSO_4*\frac{1molBaSO_4}{233.38 gBaSO_4} *\frac{1molBaCl_2}{1molBaSO_4}*\frac{208.23 gBaCl_2}{1molBaCl_2}\\\\m_{BaCl_2}=1.479gBaCl_2\)
Thus, the mass percentage is calculated as shown below:
\(\% m=\frac{1.479g}{3.656g}*100 \% \\\\\% m=40.46\%\)
Regards!
using a curling iron to curl your hair is
conduction
convection
radiation
Answer:
its Radiation
Explanation:
Because it transfers heat from a object to a less hot object in this case from a hot curling iron to your hair.
Kindly help me with the number 2 answer
The number of moles of nitrogen, N in 65 moles of Pb(NO₃)₄ is 260 moles
How do I determine the number of mole of N?We'll begin by obtaining the number of mole of N in one mole of Pb(NO₃)₄. Details below:
From the formula of Pb(NO₃)₄, we can see that there are 4 moles of N in 1 mole of Pb(NO₃)₄
With the above information, we can determine the number of mole of N in 65 moles of Pb(NO₃)₄. This is illustrated below:
1 mole of Pb(NO₃)₄ contains 4 moles of N
Therefore,
65 mole of Pb(NO₃)₄ will contain = (65 moles × 4 moles) / 1 mole = 260 moles of N
Thus, we can conclude from the above calculation that the number of mole of N is 260 moles
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A solution containing 0.026 moles of H2O2 at 25.0 °C is placed in a coffee cup calorimeter and
allowed to decompose completely according to the thermochemical equation shown below. The final temperature of the solution is 44.9 °C. Calculate the enthalpy of the reaction shown, in kJ/mol. The mass of the solution is 30.0 g and the specific heat capacity of the solution
is 4.18 J/g°C.
CHEMICAL Formula is in the photo
The enthalpy (in kJ/mol) of the reaction, given that 0.026 moles of H₂O₂ at 25.0 °C is placed in a coffee cup calorimeter is 95.98 KJ/mol
How do i determine the enthalpy of the reaction?First, we shall determine the heat energy of the reaction. Details below:
Mass of solution = 30 gInitial temperature of statue (T₁) = 25 °CFinal temperature of statue(T₂) = 44.9 °CChange in temperature (ΔT) = 44.9 - 25 = 19.9 °C Specific heat capacity of solution (C) = 4.18 J/gºC Heat energy (Q) =?Q = MCΔT
Q = 30 × 4.18 × 19.9
Q = 2495.46 J
Finally, we shall determine the enthalpy of the reaction. Details below:
Heat absorbed (Q) = 2495.46 J = 2495.46 / 1000 = 2.49546 KJMole of H₂O₂ (n) = 0.026 moleEnthalpy of reaction (ΔH) =?Q = n × ΔH
2.49546 = 0.026 × ΔH
Divide both sides by 0.026
ΔH = 2.49546 / 0.026
ΔH = 95.98 KJ/mol
Thus, the enthalpy of reaction is 95.98 KJ/mol
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How does the density of salt water differ from that of freshwater
Answer:
denser than freshwater due to the sodium chloride dissolved in it.
Explanation:
t. This means that a specific volume of salt water is heaver than the same volume of freshwater. ... While colder water is denser, when water freezes into ice, it becomes less dense and floats on the surface
Assume you have 4 solids (A, B, C and D) of similar mass. Which of these requires the greatest energy input to melt?
polar covalent
covalent network
ionic compound
nonpolar covalent
The solid that require the greatest energy input to melt by mass is the option;
Covalent network
Reason for the above answer is as follows;
The elementary particles of a solid are held together by bonds that require
an input of energy to unlock, and once broken, the particles are then able
to change location within their containing vessels with less restrictions
Types of bonds
Polar covalent molecular solids have the following characteristics;a) Soluble in water b) Low melting point, b) Conduct electricity
Solids that are made up of a covalent network have the following characteristicsa) High melting point temperature b) Non conductive of electricity c) Not soluble in water
Solids of ionic compounds have the following characteristics;a) High melting point temperature b) The liquid state and solution
conducts electricity c) Soluble in water
Solids that have nonpolar covalent bonds have;a) Low melting point b) Normally in the gaseous or liquid state b) Not water soluble
Therefore, the covalent network, and the solids ionic compounds require the most energy to melt, however, the strength of the ionic bond in an ionic compound is a factor the charges present and the sizes of the atom, while
the covalent network solid, are combined to form essentially as a single
molecule and therefore require the greatest heat energy input break the bonds of the molecule down in order to melt
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Sulfurous acid ( H2SO3) is a diprotic acid with a1=1.39×10−2 and a2=6.73×10−8.
Determine the pH of a 0.189M sulfurous acid ( H2SO3 ) solution.
A sulfuric acid solution with a concentration of 0.189M has a pH of roughly 0.778.
Sulfuric acid: Is it a diprotic acid?A diprotic acid is sulfuric acid, Sulfurous acid. The findings of an acid-base titration can be used to calculate the values of Ka1 and Ka2. To completely neutralise diprotic acids, two hydroxide ions are needed for each molecule. Sulfuric acid, a stronger acid than Hydrogen sulfide, with a pH of 1.5 in a solution of 0.100 mol dm³.
The chemical equation for sulfuric acid dissociation is as follows:
Sulfuric acid + Water ⇌ Hydronium ion + hydrosulfite anion
Write the expression for the acid dissociation constant (Ka1) for the first dissociation:
Ka1 = [Hydronium ion[hydrosulfite anion]/[Sulfuric acid]
Substitute the given value of Ka1 (1.39×10−2) and the initial concentration of Sulfuric acid (0.189 M) into the expression for Ka1 and solve for [hydronium ion]:
1.39×10−2 = [hydronium ion][Hydrogen sulfite]/0.189
[hydronium ion] = 0.167 M
pH = -log[hydronium ion]
pH = -log(0.167)
pH = 0.778
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6. How many moles are in a sample of oxygen gas if the pressure is 66.6 kPa, thevolume is 8.25 L, and the temperature is -73°C?
According to the explanation given in a previous session, we will be using again the Ideal gas law formula, which is:
PV = nRT
We have:
P = 66.6 kPa, which is 0.657 atm
V = 8.25 L
n = ?
R = 0.082
T = -73°C, or 200 K
Now adding these values into the formula:
0.657 * 8.25 = n * 0.082 * 200
5.42 = 16.4n
n = 0.33 moles of O2
Guysss how to explain nuclear chemistry? And define nuclear chemistry ?
Answer:
How do amoeba respire.
Define Diffusion.
Networks can be made of bonded ____________________ or ____________________.
could some some one help with 2 4 5 7 8
Answer:
For number 2, your answer is C.
Explanation:
The nucleus is positively charged because the proton is positive and a neutron is neutral. An electron has a negative charge.
At STP, 32 grams of O2 would occupy the same volume as:
At STP 32 g of O₂ would occupy by the same volume as 4 g of He
Further explanationComplete question
At STP 32 g of O₂ would occupy by the same volume as:
4.0 g of He8.0 g of CH₄64 g of H₂32 g of SO₂Standard Conditions
Conditions at T 0 ° C and P 1 atm are stated by STP (Standard Temperature and Pressure). At STP, Vm is 22.4 liters / mol.
So the gas will have the same volume if the number of moles is the same
mol of 32 grams of O₂ :
\(\tt \dfrac{32}{32}=1\)
He\(\tt mol=\dfrac{4}{4}=1\)
CH₄\(\tt mol=\dfrac{8}{16}=0.5\)
H₂\(\tt mol=\dfrac{64}{2}=32\)
SO₂\(\tt mol=\dfrac{32}{64}=0.5\)
So mol of 4 g He = mol of 32 g O₂
STP is the standard temperature and pressure of the gas to compare with the experimental data. At STP 32 gm of oxygen is equivalent to 4 gm of helium.
What is STP?STP is the standard temperature and pressure of 0 degrees Celsius and 1 atm. At this temperature and pressure, the volume of the gas is 22.4 L/mol.
So, if the moles of the 32 gm oxygen are the same as the other element then the volume will also be the same. Here, the moles of oxygen are 1 mol.
Moles of 4 gm helium is 1, 8 gm methane is 0.5 mol, 64 gm dihydrogen is 32 mol, and 32 gm sulfur dioxide is 0.5 mol.
Therefore, the mole of 4 gm helium is equivalent to the mole of 32 gm oxygen.
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Which equation shows an increase in entropy?
Hint: Look at the states of matter, g s l, of the chemicals in each equation. A C2H4(g) + H2(g) + C2H6(g) в Caco3(9) + Cao(s) - CO2(g) c Fe(s) + S (s) -+ FeS (s)
The equation C2H4(g) + H2(g) + C2H6(g) → Caco3(s) + Cao(s) + CO2(g) shows an increase in entropy due to the formation of a gas as a product. Option A
In this equation, the reactants on the left-hand side consist of gases (C2H4 and H2), while the products on the right-hand side include a solid (Caco3) and a gas (CO2).
When a reaction involves a change from gaseous to solid or liquid states, there is typically a decrease in entropy because the particles become more ordered and constrained in the solid or liquid phase.
Conversely, when a reaction involves the formation of gases, there is generally an increase in entropy because gases have higher degrees of molecular motion and greater freedom of movement compared to solids or liquids.
In the given equation, the reactants include three gaseous compounds (C2H4, H2, and C2H6), and one of the products is a gas (CO2). Therefore, the overall entropy of the system increases during this reaction.
The equation Fe(s) + S(s) → FeS(s) does not show an increase in entropy. Both the reactants (Fe and S) and the product (FeS) are solids. Since solids have lower entropy compared to gases or liquids, the entropy of the system does not increase in this reaction. Option A
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HELP
____________ sweat by water from the leaf cells __________________ into the air, which pulls _______________________ from the leaf into the air.
Answer:
Water sweated by water from the leaf cells evaporating into the air, which pulls water and nutrients from the leaf into the air.
Which are products of a combustion reaction?
A. CO and H20
B. Hydrocarbons and H2O
C. O2 and H2O
D. Co, and H2O
HQ5.40
Homework Answered Due Today, 11:59 PM
The reaction 3H₂(g) + N₂(g) → 2NH3(g) has an enthalpy of reaction of -92.6 kJ/mol. If 1 g of hydrogen and 2 g of nitrogen are
reacted, how much heat is produced (kJ)?
The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ
How do i determine the heat energy produced?First, we shall obtain the limiting reactant. Details below:
3H₂ + N₂ -> 2NH₃
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 g Molar mass of H₂ = 2 g/molMass of H₂ from the balanced equation = 3 × 2 = 6 gFrom the balanced equation above,
28 g of N₂ reacted with 6 g of H₂
Therefore,
2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂
We can see that only 0.43 g of H₂ is needed in the reaction.
Thus, the limiting reactant is N₂
Finally, we the amount of heat energy produced. Details below:
3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ
Molar mass of N₂ = 28 g/molMass of N₂ from the balanced equation = 1 × 28 = 28 gFrom the balanced equation above,
When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.
Therefore,
When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ
Thus the heat energy produced from the reaction is -6.61 KJ
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Akito is warming a test tube over a Bunsen burner. He heats it too much and the glass breaks.
Which best describes what Akito should do first?
Ο Ο Ο Ο
O get paper towels
O change lab stations
turn off the burner
remove his contacts
Answer:
c
Explanation:
A 3.69 g
sample of a compound consisting of carbon, hydrogen, oxygen, nitrogen, and sulfur was combusted in excess oxygen. This produced 2.08 g
CO2
and 1.28 g
H2O
. A second sample of this compound with a mass of 4.65 g
produced 4.77 g
SO3
. A third sample of this compound with a mass of 8.62 g
produced 3.48 g
HNO3
. Determine the empirical formula of the compound. Enter the correct subscripts on the given chemical formula.
The empirical formula of the compound is C₂H₁₆S₂N₃O.
What is the empirical formula of the compound?The moles of each element is as follows::
For CO₂:
Carbon (C) has a molar mass of 12.01 g/mol.
Oxygen (O) has a molar mass of 16.00 g/mol.
Moles of C in CO₂ = 2.08 g / 12.01 g/mol = 0.173 moles
Moles of O in CO₂ = 2.08 g / 16.00 g/mol = 0.130 moles
For H₂O:
Hydrogen (H) has a molar mass of 1.01 g/mol.
Oxygen (O) has a molar mass of 16.00 g/mol.
Moles of H in H₂O = 1.28 g / 1.01 g/mol = 1.27 moles
Moles of O in H₂O = 1.28 g / 16.00 g/mol = 0.080 moles
For SO₃:
Sulfur (S) has a molar mass of 32.06 g/mol.
Oxygen (O) has a molar mass of 16.00 g/mol.
Moles of S in SO₃ = 4.77 g / 32.06 g/mol = 0.149 moles
Moles of O in SO₃ = 4.77 g / 16.00 g/mol = 0.298 moles
For HNO₃:
Hydrogen (H) has a molar mass of 1.01 g/mol.
Nitrogen (N) has a molar mass of 14.01 g/mol.
Oxygen (O) has a molar mass of 16.00 g/mol.
Moles of H in HNO₃ = 3.48 g / 1.01 g/mol = 3.45 moles
Moles of N in HNO₃ = 3.48 g / 14.01 g/mol = 0.248 moles
Moles of O in HNO₃ = 3.48 g / 16.00 g/mol = 0.217 moles
The simplest whole-number ratio of the elements will be:
Carbon: 0.173 moles / 0.080 moles ≈ 2.16
Hydrogen: 1.27 moles / 0.080 moles ≈ 15.88
Sulfur: 0.149 moles / 0.080 moles ≈ 1.86
Nitrogen: 0.248 moles / 0.080 moles ≈ 3.10
Oxygen: 0.080 moles / 0.080 moles = 1
Therefore, the empirical formula is C₂H₁₆S₂N₃O.
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How many moles of ammonia are needed to react completely with 3 moles of phosphoric acid
The number of moles of ammonia, NH₃ needed to react with 3 moles of phosphoric acid, H₃PO₄ is 9 moles
We'll begin by writing the balanced equation for the reaction. THis is illustratd below:
H₃PO₄ + 3NH₃ --> (NH₄)₃PO₄
From the balanced equation above,
1 mole of H₃PO₄ reacted with 3 moles of NH₃
How to determine the mole of NH₃ neededFrom the balanced equation above,
1 mole of H₃PO₄ reacted with 3 moles of NH₃
Therefore,
3 moles of H₃PO₄ will react with = 3 × 3 = 9 moles of NH₃
Thus, 9 moles of NH₃ is needed for the reaction
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Answer:
6
Explanation:
How many atoms are in 3.2 moles of S (sulfur)?
Answer:
1.92704e24 atoms
Explanation:
Using Avogadro's number, you can set up a stoichiometric equation to find the number of atoms.
There are 1.926 × 10²⁴ atoms in 3.2 moles of sulfur (S).
How to calculate number of atoms?The number of atoms in a substance can be calculated by multiplying the number of moles by Avogadro's number.
Avogadro's number is the number of atoms present in 12 grams of isotopically pure carbon-12, being 6.02214076 × 10²³.
According to this question, there are 3.2 moles of sulfur. The number of atoms can be calculated as follows:
no of atoms = 6.02 × 10²³ × 3.2
no of atoms = 19.26 × 10²³
no of atoms = 1.926 × 10²⁴
Therefore, 1.926 × 10²⁴ atoms are in 3.2 moles of sulfur.
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Histamine is a substance that is released by cells in response to injury,
infections, stings and stuff that cause allergic responses, such as pollen.
Histamine causes dilation of blood vessels and swelling due to
accumulation of fluid in the tissues. People sometimes take antihistamine
drugs to counteract the effects of histamine. A sample of histamine having
a mass of 0.367 g is composed of 0.190 g of carbon, 0.031 g of hydrogen
and 0.146 g of nitrogen. What is its empirical formula?
Answer:
the emperical formula if histame is
Explanation:
C5H9N3
A sample of 2.0 grams of helium gas is contained in a tank with a volume of 5.0 L at a temperature of 25° C. what is the pressure of the gas in the tank in atm?
Glucose, C6H12O6, is used to prepare intravenous feeding solutions. What volume of 5.0 % W/V glucose solution can be prepared using 125 g of glucose? Show your working.
Please if the answer is correct, ill give brainliest
250 L of 5.0% w/v glucose solution can be prepared using 125 g of glucose.
We use the below formula to solve our problem,w/v = [ mass of solute (g) / volume of solution (mL) ] × 100
Substitute the values from our problem,5.0 % w/v = [ 125 g / volume of solution (mL) ] × 100
Rearranging the formula, we havevolume of solution (mL) = [ 125 g / 5.0 % w/v ] x 100
Substitute further for w/v,volume of solution (mL) = [ 125 g / (5.0 / 100) ] x 100
Simplify the expression,volume of solution (mL) = [ 125 g / 0.05 ] x 100
Hence, the volume of solution (mL) = 250,000 mL or 250 LHow is beryllium (Be) similar to calcium (Ca)?
Explanation:
beryllium, calcium, strontium, barium, and radium; they are in the same group of table.
Answer:
Both Beryllium and Calcium have 2 valence electrons, i.e. in ther electronic configuration there are 2 electrons remaining in the outermost shell. Thus their valencies are also 2.
Electronic Configurations:
Beryllium (4) : - [2, 2]
Calcium (20) : [2, 8, 8, 2]
Hope it helps
Thank you for the question
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Edit
a. both are very reactive
b. both react readily with elements in group 1
c. both rarely combine with other elements
d. both are rare metals
(As per the suggestion of bvbfanforeverap5j54d)
An OBJECT absorbs like between the light wavelengths of 430 - 400 nm. What is the color of the OBJECT?
The color of the object appears as yellow/orange.
What is the color?
The visible light spectrum spans a wavelength range of 400 to 700 nanometers (nm), with shorter wavelengths appearing as blue or violet and longer wavelengths as red.
This object is absorbing light with wavelengths between 430 and 400 nm, indicating that it is absorbing light that is visible in the blue and violet spectrum.
We know that this color that we see is actually a complementary color to blue/violet from the color wheel.
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A chemical regulator may be used to kill dandelions on your lawn
True
or
False
Answer:
In fact yes
Explanation:
In fact, only a small amount of a growth regulator such as 2,4-D is needed to kill some plants. ... That is the reason why some w^eeds, including dandelions
which is the graph of the function g(x) = f(-x)
To graph the function g(x) = f(-x), you can start with the graph of f(x) and then reflect it about the y-axis.
What is a graph of the function g(x) = f(-x)?To find the graph of the function g(x) = f(-x), we can start with the graph of the function f(x) and then reflect it about the y-axis.
If the graph of f(x) is symmetric with respect to the y-axis, meaning it is unchanged when reflected, then g(x) = f(-x) will have the same graph as f(x).
However, if the graph of f(x) is not symmetric with respect to the y-axis, then g(x) = f(-x) will be a reflection of f(x) about the y-axis.
In either case, the resulting graph of g(x) = f(-x) will be symmetric with respect to the y-axis.
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