Answers
Answer:
Explanation:
a) When the iron rod is heated, it expands (gets larger). That's the key to this whole procedure. It doesn't expand much -- depending on what temperature the iron rod is heated up to.
When the rod looks like it has expanded as much as it can, the rod is tightened as much as it can be tightened before damage is done. When the rod cools, it contracts (gets smaller). That brings the walls closer together or it stops the walls from bulging.
Very interesting question. I've never seen this. Thanks for asking.
Related Questions
Which of the following does the law of conservation of mass not state?
Answers
Answer:
C
Explanation:
PLEASE HELP
Referring to the energy diagram below which arrow segment represents the activation
energy of this reaction?
O Arrow B
O Arrow D
O Arrow A
O Arrow C
Answers
Answer:
Arrow B
Explanation:
One method for determining the identity of an unknown organic compound is through combustion analysis. A sample of an unknown substance is burned, and the amounts of water and carbon dioxide produced can be used to find the relative amounts of carbon, hydrogen, and oxygen. These devices can be modified to determine the composition of inorganic compounds as well. A combustion analysis shows that an unknown sample of gas is made of 85.5% carbon and 14.3% hydrogen. What is the empirical formula of the compound
Answers
Answer:
Empirical formula: CH₂
Explanation:
We need to find the empirical formula of a compound that has carbon and hydrogen.
To find the empirical formula of any compound, if we have the mass or mass percent, we should follow 3 steps:
1. Calculate the moles, dividing by the atomic weight.
The atomic weight for carbon and hydrogen are 12 g/mol and 1 g/mol, so, doing the division we have:
C = 85.5 / 12 = 7.125
H = 14.3 / 1 = 14.3
2. Determine the number of atoms of each element in the formula
To do this, we just divide the previous moles by the lowest quantity we obtain. In this case, the carbon:
C = 7,125 / 7,125 = 1
H = 14,3 / 7,125 = 2
This means we have 1 atom of carbon and 2 atoms of hydrogen.
3. Write the empirical formula with the previously obtained atoms
Now that we obtained the atoms of each element, we just write the empirical formula with these numbers:
C₁H₂ but we can neglect the number one so:
Empirical formula: CH₂Hope this helps
Marcus has a mass of 75 kg here on Earth. What would his mass be if he was standing on
the Moon?
Remember, gravity on Earth is 9.8 m/s2, gravity on the moon is 1.6 m/s2
1. 120 kg
2. 47 kg
3. 75 kg
4. 20 kg
NO LINKS OR FILE PLEASE
Answers
Answer:
120Kg
Explanation:
body is in moon so we have to multiply mass and gravity of moon
NO LINKS!!!!!!!!
how many joules are needed to heat 20g of Cu from 10 to 50 degrees C?
Answers
Answer:
q=309.6 J
Explanation:
Here we'll be using the formula of specific heat capacity: Q=mcΔT
Q= heat (joules)
m=mass (g)
c=specific heat capacity
ΔT= change in temperature > Final temp. - initial temp.
Let's plug in what we know and solve for q=heat.
q=(20)(0.387)(50-10)
q=(20)(0.387)(40)
q=309.6 joules
Depending on your teacher and the problem, they might want you to keep the temperature in C. Mine wanted them all in Kelvin, so if we were to convert it to Kelvin it would be:
273 + 40= 313 K
q=(20)(0.387)(313)
q=2422.6 J
A. Exothermic
B. Isothermic
C. Endothermic
Answers
Answer:
C. Endothermic
Explanation:
Since the products potential energy is higher than the reactants potential energy, it has abosrbed energy, thus making the graph endothermic.
What is defined as the energy required to start a chemical reaction?
heat
reactant energy
activation energy
precipitate energy
Answers
Answer:
The energy required to start a reaction is Activation energy.
If 125 mL of 0.56 MH2SO4, is diluted to a volume of 0.250 L, what is the molarity of the resulting solution?
Answers
Answer:
0.28M H2SO4
Explanation:
The molarity of a solution is defined as the ratio between the moles of the solute (In this case, H2SO4) and its volume in liters.
In the problem, the volume of the solution is increased from 125mL to 250mL. That means the solution is diluted:
250mL / 125mL = 2 times.
As the solution is diluted 2 times, the concentration is decreased in 2, that is:
0.56M / 2 =
0.28M H2SO4Which of the substances below would have the lowest boiling point?
propane, with a vapor A.pressure of 998 kPa at 293K
B.water, with a vapor pressure of 2.3 kPa at 293K
C.ethanol, with a vapor pressure of 5.83 kPa at 293 K
D.butane, with a vapor pressure of 220 kPa at 293 K
Answers
Answer: The answer is A.
Explanation: The higher the kPa, the lower the boiling point
Why the energy difference between the removal of the 2nd and 3rd electrons is smaller than that between the removal of the 3rd the 4th electrons ?
Answers
Answer:
See Explanation
Explanation:
Let us remember the fact that electrons actually repel each other in the atom. The more the number of electrons, the greater the repulsion experienced.
Hence, as electrons are successively removed from the atom at each stage of ionization, the magnitude of repulsion due to the presence of more electrons decreases as further electrons are removed, ionization energy consequently increases. Thus, the energy difference between the removal of the 2nd and 3rd electrons is smaller than that between the removal of the 3rd the 4th electrons.
Sometimes, when the removal of the 4th electron has to occur in an inner filled shell which is more stable, a far higher amount of energy is required (a quantum jump) compared to the removal of any of the first three electrons that are present in an incompletely filled outermost shell, E.g in aluminium.
What is the single replacement reaction of Zinc + Lead(iv) Chloride
Answers
Answer:
[tex]2Zn+PbCl_4\rightarrow 2ZnCl_2+Pb[/tex]
Explanation:
Hello there!
In this case, when referring to single replacement reactions, it is crucial for us to figure out the formula of the starting reactants; thus, we know zinc is Zn and lead (IV) chloride is PbCl₄. In such a way, the reaction proceeds as follows:
[tex]Zn+PbCl_4\rightarrow ZnCl_2+Pb[/tex]
Which must be balanced as shown below:
[tex]2Zn+PbCl_4\rightarrow 2ZnCl_2+Pb[/tex]
Regards!
Why do you think certain countries favored military solutions to the great depression while other contries did not
Answers
Answer:
The answer is below
Explanation:
Certain countries like Germany under Adolf Hitler favored military solutions to the great depression because the government felt that having a mass production of military weapons and recruitment of unemployed people or citizens into the army would change the dire situation.
On the other hand, countries like the United States did not favor the military solutions but instead choose the NEW DEAL under Franklin D Roosevelt; the reason could be linked to their democratic culture, the isolation belief tendency.
En el laboratorio, se lleva a cabo un experimento para investigar los efecto de la generación de SO3, para lo cual se introducen una cierta cantidad de gramos de SO2 en un recipiente de 1 L que ya estaba previamente lleno de aire a 740 mmHg y 298K (composición molar del aire 79% N y 21% O2)
¿Qué volumen de SO2 (medido a 1000 mmHg y 30°C) será necesario para que reaccione todo el O2 que había en el recipiente?
Answers
Answer:
i love you i need you im sorry
Which statement most accurately describes the direction of drag
Answers
Answer:
Drag opposes forward motion.
Explanation:
Drag always opposes forward motion or slows you down.
when do electrons release photons
Answers
Answer:
Later when they are older
Explanation:
brainliest/
Detergent is an example of what type of compound?
A.) synthetic organic compound
B.) organic compound
C.) chlorofluorocarbon
Answers
Answer : A
Explanation : Surface-active compounds/agents (surfactants) Substances which have the effect of reducing the surface tension of a solvent, an example being a detergent/surfactant or soap dissolved in water. ... Both synthetic detergents and soaps are surfactants. Surfactants See "Surface-active compounds/agents".
According to the context, a detergent is an example of a synthetic organic compound.
What is a detergent?They are a group of synthetic organic compounds that have the property of lowering the surface tension of the liquids in which they are dissolved.
These contain surfactant substances that help in penetration, soaking, emulsification, dispersion, solubilization.
Therefore, we can conclude that according to the context, a detergent is an example of a synthetic organic compound.
Learn more about synthetic organic compound here: https://brainly.com/question/13049450
#SPJ2
Q.Join sentence using connective.
1.Mary was sick last week.She was a doctor.
1.
Answers
Answer:
doctor Mary fell sick last week
Nitrogen ion (Nitride) is ... Cation/Anion/Neither? # of protons? # of electrons? Charge (1-, 2-, 3-, 1+, 2+, 3+, or 0) Number of dots on the Lewis dot structure?
Answers
Answer:
3- is the charge and 8 dots on its Lewis dot structure.
Explanation:
Hello there!
In this case, since nitrogen is an element with five valence electrons (electrons on its outer shell), we infer that it needs three bonds to complete the octet, for which its charge, when forming nitride ions is 3-, which means it has received three electrons. Thus, when drawing the Lewis dot structure, it is evident that is will have 5+3 = 8 dots due to the electron reception.
Regards!
If a gas exerts 812 torr of pressure at a volume of 31 liters and the temperature of 30 degrees C, how many moles of gas are in the container?
Answers
Answer:
1.35 moles
Explanation:
Assuming the gas is ideal, we can solve this problem by using the following equation:
PV = nRTWhere:
P = 812 torr ⇒ 812 / 760 = 1.08 atmV = 31 Ln = ?R = 0.082 atm·L·mol⁻¹·K⁻¹T = 30 °C ⇒ 30 + 273.16 = 303.16 KWe input the data:
1.08 atm * 31 L = n * 0.082 atm·L·mol⁻¹·K⁻¹ * 303.16 KAnd solve for n:
n = 1.35 mola link bot answered my question so let me ask again
Answers
Answer:
4 NH3 + 5 O2 = 4 NO + 6 H2O
Explanation:
Balance to have equal atoms on both sides.
*
Matter cannot be divided indefinitely is part of the:
Answers
Answer:
4+4=8
Explanation:
8=X
On the pH scale higher numbers indicate ?
Answers
Answer:
Higher numbers indicate bases- not acidic/less acidic
Explanation:
Answer:
higher the ph number means stronger base
Explanation:
5. How much heat is evolved when 24.9 g of propanol (C3H7OH) is burned? ΔHcomb = −2010 kJ/mol
Answers
The heat is evolved when 24.9 g of propanol (C3H7OH) is burned is 834.15 J
To solve this question, First, we need to find the number of moles present in 24.9 g of propanol.
⇒ Formula
n = M/m................. Equation 1⇒ Where:
n = number of moles M = mass of propanolm = molar mass of propanolFrom the question,
⇒ Given:
M = 24.9 gm = (12×3)+(1×8)+16 = 36+8+16 = 60 g/mol⇒ Substitute these values into equation 1
n = 24.9/60n = 0.415 mol⇒ Finally the heat evolved is
Q = nΔHQ = 0.415(-2010)Q = -834.15 JHence, The heat evolved when propanol is burned is 834.15 J
Learn more about heat here: https://brainly.com/question/21222010
If 18.6 g of methanol is used to dissolve 2.68 g of Hg(CN)2, what is the molality of the solution?
Answers
Answer:
I searched it up and screenshot it
Explanation:
I searched it up : )
GIVING BRAINLIEST!!!!!!!
PLSSS HELPPP!!!!
Jody had a chicken sandwich and orange juice for lunch. What do you think happens to this food after being passed to the intestines?
A)Both the small and large intestine filter the food from harmful material before they pass into the blood stream.
B)The small intestine absorbs the nutrients into the blood stream and the large intestine absorbs the water.
C)The small intestine turns the food mixture into solid wastes and the large intestine absorbs the nutrients.
D)The small intestine passes oxygen into the food mixture and the large intestine releases it as waste.
Pls no links it’s annoying
Answers
Answer:
it's B
Explanation:
the small intestine is know to carrie out most of the digestive process absorbing almost all the nutrients and well the large intestine absorbs water. hope it helps :)
What causes elements to react to each other
Answers
Answer:
One atom of each element is made up of protons, neutrons, and electrons. The number of electrons determines how an element reacts. The number of protons gives the element its identity. ... They react well with nonmetals because they can easily give up electrons to form ions.
Hydrochloric acid reacts with metals to produce hydrogen gas according to
the equation shown below. How many grams of a metal (X) will be
consumed in a reaction if 49.0 mL of 3.0 M HCl are used? The molar mass
of the metal (X) is 72.55 g/mol. Report your answer to the nearest tenth.
2 HCl + X --> XCl2 + H2
Answers
Answer:
5.33g of X will be consumed
Explanation:
Based on the reaction, 2 moles of HCl reacts per mole of the metal. To solve this question we must find, as first, the moles of HCl that reacted. With these moles and the chemical equation we can find the moles of X and its mass (With molar mass) as follows:
Moles HCl:
49.0mL = 0.0490L * (3.0mol / L) = 0.147 moles HCl
Moles X:
0.147 moles HCl * (1mol X / 2mol HCl) = 0.0735 moles X
Mass X:
0.0735 moles X * (72.55g / mol) =
5.33g of X will be consumedWhat are carbohydrates?
A. a type of base
B. a type of glyceride
C. a type of macromolecule
D. a type of amino acid
Answers
Answer:
a
Explanation:
me say so
Answer:
C
Explanation:
EL hidroxido de sodio reacciona con el sulfato de hierro (II) para formar sulfato de sdio e hidroxido ferroso. Si se hace reaccionar 250g de hidroxido de sodio ¿Cuantos g de hidróxido ferroso se produce?
Answers
Answer:
280.8 g
Explanation:
Definimos la reaccion:
2NaOH + FeSO₄ → Na₂SO₄ + Fe(OH)₂
Como tenemos la masa de NaOH, asumimos que el sulfato de hierro (II) es el reactivo en exceso.
Definimos masa de reactivo: 250 g . 1mol / 40g = 6.25 mol
2 moles de NaOH producen 1 mol de hidroxido ferroso
Entonces 6.25 moles producirán, la mitad (6.25 . 1) /2 = 3.125 moles
Convertimos los moles a masa:
3.125 mol . 89.85 g/mol = 280.8 g
What does the latent heat of vaporization measure?
A. The energy required to melt a substance
B. The energy required to heat a substance
C. The energy required to form a substance
D. The energy required to boil a substance
Answers
Answer: D. The energy required to boil a substance
Explanation: I just took the quiz and got it correct :)