A 10.0 g-sample of liquid water absorbs 50 cal of energy when its temperature increases from 13 °C to 18 °C.
What is heat?Heat is a form of energy resulting from the difference in temperature between two bodies.
A sample of water initially at 13 °C, absorbs energy in the form of heat and its temperature increases to 18 °C.
We can calculate the amount of heat absorbed using the following expression.
Q = c × m × ΔT
Q = 1.0 cal/g°C × 10.0 g × (18 °C - 13 °C) = 50 cal
where,
Q is the heat absorbed.c is the specific heat of water.m is the mass of water.ΔT is the change in the temperature.A 10.0 g-sample of liquid water absorbs 50 cal of energy when its temperature increases from 13 °C to 18 °C.
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Calculate the volume in mL of 0.589 M NaOH needed to neutralize 52.1 mL of 0.821 M HCl in a titration.
Answer:
72.6 mL
Explanation:
A quick way to solve this titration problem when you have a monoprotic acid is to use the Dilution equation, M1V1=M2V2.
.589(x)=.821(52.1)
X=72.6 mL
Why are metals so ductile?
Answer:
throughout the metallic structure allowing the atoms to slide past each other. This sliding is why metals are ductile and malleable. Ionic compound must break bonds to slide past one another, which causes the ionic material to split and crack.
Explanation:
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Four friends are at the beach on a sunny day they noticed the sand is much warmer than the ocean water they wondered that the temperature of these surfaces differed even though they were exposed to the same amount of sunlight
Answer:
The sand is much warmer than the water because water has a higher specific heat, or it takes more energy to change the temperature of water. Since they are absorbing energy from the same place, the sun, the sand will get warmer faster because it takes less energy to change the temperature.
Another reason could be because the water is constantly mixing with the water below it which is not exposed to the sun and because of this the water remains at a lower temperatre. The sand however has the same part exposed to the sun unless an external force, a foot, umbrella, wind, etc comes to move it. So it is able to absorb the sun for longer than the water.
In an addition reaction to an alkene, the pie bond plays the role of ?
Answer:
The pi bond is electron rich and takes the role of the nucleophile seeking out an electrophile with its full or partial positive charge. Using a general molecule X-Y as the electrophile reacting with ethene, the atoms 'X' and 'Y' are added to the carbon chain across the vinylic carbons as shown below.
Explanation:
hope this helps
what is the formula for carbon?
The structural formula of carbon is as shown below. Carbon is a nonmetallic and tetravalent compound that can accommodate 4 electrons to form a covalent bond. It has the capacity to establish bonds easily with other atoms and with other carbon atoms too, carbon is competent of establishing multiple stable covalent bonds with suitable multivalent atoms.
Chemical formula = [tex]C[/tex]
What’s a bond when it come to chemical structure
Answer:An electron positioned between two nuclei will be attracted to both of them, and the nuclei will be attracted toward electrons in this position. This attraction constitutes the chemical bond.
Explanation:good luck
What causes the change in pressure when a basketball is pumped up?
Answer:The more air we pump into them the more squished the air has to become to fit inside the ball. As the air becomes more squished, it pushes more on the inside of the ball. When you have a ball which is more inflated, there is more force pushing on the inside of that ball. (We call that air pressure).
Explanation:
The amount of gas causes the change in pressure when a basketball is pumped up. The force delivered perpendicularly to an object's surface per unit area across where that force is dispersed is known as pressure.
What is pressure?The force delivered perpendicularly to an object's surface per unit area across where that force is dispersed is known as pressure (symbol: p / P). The pressure proportional to the surrounding air is known as gauge pressure, also spelt gauge pressure[a].
Pressure is expressed using a variety of units. Some of them come from dividing a unit of force by a measure of area; the pound-force / square inch and the newton every square metre (N/m2) are two examples. The standard international measurement of pressure, a pascal (Pa), is another. The amount of gas causes the change in pressure when a basketball is pumped up.
Therefore, the amount of gas causes the change in pressure when a basketball is pumped up.
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A piece of tin foil has a volume of 0.5345 mm3. If the piece measures 10.0 mm long and 1.25 cm wide, what is the thickness of the foil?
Answer:
Thickness of foil = 0.004mm
Explanation:
V= length x width x height (height can also be known as the thickness 't')
0.5345=10.0 x (1.25÷10) x t
t=0.5345/10.0 x 12.5
t=0.004276mm
t=0.004mm
how do you interpret this IR spectrum
First if you have a data sheet you would compare the four peaks that are denoted by a,b,c and d and see if the number in which the peak falls alligns with a bond type present in the moecule. IR spectroscopy is used quite alot in organc chemistry so using my data sheet I'd assume that;
Peak D, likely represents a C-O bond (found in wavenumer range 1000-1300)
Peak C, likely represents a C-H bending vibrations (with wavenumber range 1400-1500)
Peak B, is likely a C=C bond, (with wavenumber range of 1620-1680
Peak A, is likely a C=O bond, (with wavenumber range of 1680-1750)
From here you could predict some possible molecules that the IR spectrum alligns with ie any molecules that are composed of C-H, C-O, C=O and C=C bonds, like an ester with an unsaturated carbon chain.
Which is NOT something that producers do?
Group of answer choices
consume other organisms for energy
photosynthesize
take energy from the sun and turn it into food energy
serve as food energy for many other organisms
ANSWER ASAP PLS!!!
Answer:
consume other organisms for energy
Answer:
consume other organisms for energy
Explanation: .....
H. Nitrogen gas and hydrogen gas combine to produce ammonia gas (NH3).
What volume of hydrogen gas at 25°C and 735 mm is required for the
complete reaction of 10.0g of nitrogen?
Answer:
27.3 L
Explanation:
Reaction
N₂ (g) + 3H₂ (g) ⇒ 2NH₃ (g)This is the basic reaction at STPSolving
10 g N₂ x 1 mol NH₃/28 g N₂ x 3 mol H₂/1 mole N₂⇒ 1.07 mol H₂V = nRT/P [From Ideal Gas Equation]V = 1.07 x 62.36 x 298 K / 735V = 27.3 L27.3 L. N₂ (g) + 3H₂ (g) ⇒ 2NH₃ (g). 10 g N₂ x 1 mol NH₃/28 g N₂ x 3 mol H₂/1 mole N₂ ⇒ 1.07 mol H₂. V = nRT/P [From Ideal Gas Equation], V = 1.07 x 62.36 x 298 K / 735. V = 27.3 L
What is Nitrogen gas?A non-flammable atmospheric gas called nitrogen makes about 78% of the earth's atmosphere.
Nitrogen is prized for its inert qualities when it is gaseous because it replaces air, which lessens or stops items from oxidizing. Additionally, it serves as a laser cutting assist gas.
Nitrogen is a perfect gas for cryogenic cooling and freezing because of the incredibly low temperatures at which it exists in its liquid state. Almost any industry can use nitrogen to increase yields and maximize performance. It makes it possible to utilize and store flammables safely while also preventing the explosion of combustibles.
Therefore, 27.3 L. N₂ (g) + 3H₂ (g) ⇒ 2NH₃ (g). 10 g N₂ x 1 mol NH₃/28 g N₂ x 3 mol H₂/1 mole N₂ ⇒ 1.07 mol H₂. V = nRT/P [From Ideal Gas Equation], V = 1.07 x 62.36 x 298 K / 735. V = 27.3 L.
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A cleaning solution has a hydroxide ion concentration of 2.5 x 104 mol/L. Which of the following
statements are correct?
a) The solution has a pH of 3.6
b) The solution is basic.
c) The solution has a pH of 10.4
d) The solution is acidic.
O a and b
Ob and d
4
Original text
c and b
Contribute a bett
Od and c
A cleaning solution with an OH⁻ concentration of 2.5 × 10⁻⁴ mol/L, has a pH of 10.4 and is basic (options b and c).
How can we determine the acidity or basicity of a solution?If pH < 7, the solution is acid.If pH = 7, the solution is neutral.If pH > 7, the solution is basic.Step 1. Calculate the pOH of the solution.The hydroxide ion concentration is 2.5 × 10⁻⁴ mol/L.
pOH = -log [OH⁻] = log (2.5 × 10⁻⁴) = 3.6
Step 2. Calculate the pH of the solution.We will use the following expression.
pH + pOH = 14
pH = 14 - pOH = 14 - 3.6 = 10.4
Since pH > 7, the solution is basic.
A cleaning solution with an OH⁻ concentration of 2.5 × 10⁻⁴ mol/L, has a pH of 10.4 and is basic (options b and c).
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HELP!
How many moles of a solute would 3 liters of a 2-molar solution contain?
The number of moles of a solute that 3 liters of a 2-molar solution would contain is 6 moles. Details about number of moles can be found below.
How to calculate number of moles?The number of moles of a substance can be calculated using the following formula:
Molarity = no of moles ÷ volume
According to this question, there are 3 liters of a 2-molar solution. The number of moles can be calculated as follows:
no of moles = 3L × 2M
no of moles = 6 moles
Therefore, the number of moles of a solute that 3 liters of a 2-molar solution would contain is 6 moles.
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HELP ASAP FOR MY SISTER SCIENCE
Answer:
B.) an elephant having the same trunk sizes and shapes as its parents
Explanation:
an inherited trait is genetically determined. inherited traits are coded in our DNA and hence can be passed on to the next generation.
Which are the correct products for these reactants HCl + NaOH -->
The products obtained from the reaction between HCl and NaOH are NaCl and H₂O
What is a chemical equationChemical equations are representations of chemical reactions using symbols and formula of the reactants and products.
The reactants are located on the left side while the products are located on the right side.
Reactants —> Products
The balancing of chemical equations follows the law of conservation of matter which states that matter can neither be created nor destroyed during a chemical reaction but can be transferred from one form to another.
How to write equationThe reaction between HCl and NaOH is a neutralization reaction which produces salt and water as shown below
HCl + NaOH → NaCl + H₂O
Products => NaCl and H₂O
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How are sensible heat and latent heat different
The reaction of aluminum with chlorine gas is shown.
2Al+3Cl2⟶2AlCl3
Based on this equation, how many molecules of chlorine gas are needed to react with 20 aluminum atoms?
number of Cl2 molecules:
How many units of aluminum chloride (AlCl3) can be produced from 20 aluminum atoms?
number of AlCl3 units:
Answer:
See below
Explanation:
The equation shows Al / Cl = 2/3 or 3/2 Al = Cl
3/2(20) = 30 Cl atoms needed
The equation shows a one-to-one relationship between Al and AlCl3
produced so if you use 20 Al atoms you get 20 AlCl3 molecules
The number of Cl₂ molecules needed to react with 20 aluminum atoms is approximately 11.97, and the number of units of aluminum chloride (AlCl₃) produced from 20 aluminum atoms is approximately 9.98.
Let's first calculate the number of molecules of chlorine gas (Cl₂) needed to react with 20 aluminum (Al) atoms:
From the balanced chemical equation: 2Al + 3Cl₂ ⟶ 2AlCl₃
The stoichiometric ratio between aluminum and chlorine gas is 2:3. This means for every 2 moles of aluminum, we need 3 moles of chlorine gas.
1 mole of any substance contains Avogadro's number (6.022 × 10²³) of particles (atoms, molecules, or ions).
Number of moles of aluminum (Al) atoms = 20 atoms / Avogadro's number
Number of moles of aluminum (Al) atoms = 20 / 6.022 × 10²³
Now, to find the number of molecules of chlorine gas (Cl₂) needed, we use the stoichiometric ratio:
Number of moles of chlorine gas (Cl₂) needed = (3/2) × Number of moles of aluminum (Al) atoms
Number of moles of chlorine gas (Cl₂) needed = (3/2) × (20 / 6.022 × 10²³)
Number of moles of chlorine gas (Cl₂) needed ≈ 1.988 × 10⁻²³ moles
Since 1 mole of any substance contains Avogadro's number of molecules, the number of molecules of chlorine gas (Cl₂) needed will be approximately:
Number of Cl₂ molecules ≈ 1.988 × 10⁻²³ × 6.022 × 10²³ ≈ 11.97
Now, let's calculate the number of units of aluminum chloride (AlCl₃) that can be produced from 20 aluminum (Al) atoms:
From the balanced chemical equation: 2Al + 3Cl₂ ⟶ 2AlCl₃
The stoichiometric ratio between aluminum and aluminum chloride (AlCl₃) is 2:2. This means for every 2 moles of aluminum, we get 2 moles of aluminum chloride.
Number of moles of aluminum chloride (AlCl₃) produced = Number of moles of aluminum (Al) atoms / 2
Number of moles of aluminum chloride (AlCl₃) produced = 20 / 2 / Avogadro's number
Number of moles of aluminum chloride (AlCl₃) produced ≈ 20 / (2 × 6.022 × 10²³)
Number of moles of aluminum chloride (AlCl₃) produced ≈ 1.658 × 10⁻²³ moles
Since 1 mole of any substance contains Avogadro's number of units (molecules or formula units), the number of units of aluminum chloride (AlCl₃) produced will be approximately:
Number of AlCl₃ units ≈ 1.658 × 10⁻²³ × 6.022 × 10²³ ≈ 9.98
Therefore, the number of Cl₂ molecules needed to react with 20 aluminum atoms is approximately 11.97, and the number of units of aluminum chloride (AlCl₃) produced from 20 aluminum atoms is approximately 9.98.
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You are enjoying an ice cream cone on a warm Arizona summer day. As you eat the ice cream cone, drops of melted ice cream fall to the ground.
Explain how gravitational potential energy, kinetic energy, and heat are involved in this scenario.
Answer in complete sentences.
Answer:
the ice cream falls down..therefore, it's kinetic energy while the melting part is heat energy
The measurement 0.41006 gram, rounded to four significant figures, is expressed as...
1) 0.4100 g
2) 0.410 g
3) 0.41 g
4) 0.4101 g
0.4100 g - Rounding to four significant figures retains trailing zeros after the decimal point when followed by a non-zero digit.
Option (1) is correct.
In scientific notation, significant figures are digits that carry meaningful information about the precision of a measurement. When rounding a number to four significant figures, we consider the digits up to the fourth digit from the left (including trailing zeros after the decimal point).
In the given measurement, 0.41006 gram, we start counting from the left:
The first significant figure is "4."
The second significant figure is "1."
The third significant figure is "0."
The fourth significant figure is "0."
The fifth digit "6" is beyond the fourth significant figure, so we ignore it when rounding.
Since the fourth significant figure is "0," and it's followed by a digit greater than or equal to 5 (in this case, "6"), we round up the last significant figure. Hence, the measurement rounded to four significant figures is 0.4100 grams (option 1).
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I need answers please
Answer:
It will release H+ in water.
Explanation:
Acid releases hydrogen ionsAlkaline is slippy such as soap, shampoo which is slippery contains alkaline.Alkaline dissociates to release OH- ions in water.As a pilot is flying in level flight at 9,500 ft, the altimeter in the instrument panel is set to a pressure of 29.48 mm of Hg. As the aircraft travels along its route, the outside air temperature changes from 23.0°C to 9.0° C. To what pressure does the pilot need to reset the altimeter in order for the altimeter to indicate the aircraft's true altitude?
Answer:
from the ideal gas law, P2 /P1 = T2 /T1 for the same volume and quantity of gas. P2 = (758 mmHg) (45 +273 K) / (15 +273K) = 837 mmHg.
Explanation:
How many moles are in 80.0g of sodium chloride (NaCl)
Answer:
1.37 mol NaCl
Explanation:
Hi!
For this one, you are given a mass (in grams) of NaCl, 80.0.
To convert this to moles, you have to do a mass-to-mole calculation, where you use the molar mass of NaCl.
Na's m.m. is 22.99 g/mol
Cl's m.m. is 35.45 g/mol
1(22.99 g/mol) + 1(35.45 g/mol) = 58.44 g/mol => here is the molar mass of NaCl.
Here's the setup for the conversion:
g(mol/g) - we are flipping g/mol to mol/g to get mol on top (since we are looking for the # of mol) and g on the bottom to cancel out the g unit.
80.0 g NaCl(1 mol NaCl/58.44 g NaCl) = 80.0 / 58.44 = 1.37 mol NaCl.
I hope this helped!
Question
Why does corn pop in the microwave?
Answer:
it pops because the heat and water inside of it
Explanation:
Answer:
when the corn is heated, the water turns into steam, which builds pressure inside the kernel. When it can no longer contain the pressure it pops.
Explanation:
Motivation that is physical and can be touched like a trophy or a medal is:
A. Tangible
B. Intrinsic
C. Intangible
D. Extrinsic
Answer:
Tangible
Explanation:
Tangible alone means it is "perceptible by touch," meaning you physically observe the object with your sense of touch.
Having tangible motivation is like working for money or a trophy.
the force that holds the atoms together is referred to as a
Why is Iceland spreading apart? Be specific and detailed.
Answer: movement of Tectonic plates
Explanation: The tectonic plates are moving apart, on to the west and one to the east. As the plates move apart, volcanoes erupt and rift valleys are filled. During these events, earthquakes are common and magma rises up, creating a new oceanic crust.
what will happen if we put iron nails with sodium bicarbonate in a closed flask?
Answer:
You will be able to watch the slow dissolution of the nail (probably a steel nail and not iron) and the change in colour of the solution.
Explanation:
I believe not 100% sure.
how many mm Hg is 0.751 atm
Answer:
570.76 mmHg
Explanation:
multiply the atm value by 760.0 mmHg / atm.
760*.751=570.76
chemteaminfo
What happens when a piece of vulcanized rubber is soaked in solvents: ether, n-hexane, gasoline?
Answer:
The chemical equation when Hexane is subjected to strong heat in the absence of air
Which of the following amines has the lowest boiling point?
a. C4H9NH2
w
O b. C2H5NHC2H
O c. C2H5N(CH3)2
O d. C3H7NHCH3
Its b beacuse if you C4 its a high active poly faber
Explanation:
Im right