What is the total number of joules required to freeze a 10 g sample of water at 0°C?
show work if possible and will give brainliest
Explanation:
the answer will be 98.4 kJ
As per concept of enthalpy of fusion , 98,397 joules of energy are required to freeze 10 g of water at 0°C.
What is enthalpy of fusion?Enthalpy of fusion is defined as the enthalpy change which results from when a substance changes its state from solid to a liquid at a constant pressure.Heat of solidification is opposite of enthalpy of fusion.During fusion there is a phase transition which takes place, from liquid to solid.
The temperature at which the fusion takes place is called as the fusion temperature. This enthalpy is accompanied without any change in temperature.
Enthalpy of fusion of water=333.55 J/g . This value is for 1 g of water as per definition,hence for 10 g water enthalpy of fusion is 10×333.55=3335.5 J.
Hence, 3335.5 joules are required for freezing 10 g sample.
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Need help with question 3!
*please answer correctly*
A student increases the temperature of a 300cm3 balloon from 40°C to 110°C.
What will the new volume of the balloon be? Round your answer to one decimal point.
(To convert Celsius to kelvin, add 273.15)
Thank you!!!
Answer:
[tex]V_2=367.06\ cm^3[/tex]
Explanation:
Charles law states that volume of the gas is directly proportional to the temperature i.e.
[tex]\dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
We ave,
V₁ = 300 cm³
T₁ = 40°C = 40 + 273.15 = 313.15 K
T₂ = 110°C = 110 + 273.15 = 383.15 K
Let V₂ be the new volume.
[tex]V_2=\dfrac{V_1T_2}{T_1}\\\\V_2=\dfrac{300\times 383.15 }{313.15}\\\\V_2=367.06\ cm^3[/tex]
So, the new volume of the balloon is [tex]367.06\ cm^3[/tex].
Help pls thnk you!!!!
how many grams of ZrCl4 can be produced if 123 g of ZrSiO4 react with 85.0 g of Cl2?
Answer:
153.3 grams of ZrCl₄ are produced
Explanation:
The equation of the reaction is as follows:
ZrSiO₄ + Cl₂ ----> ZrCl₄ + SiO₂ + O₂
molar mass of ZrSiO₄ = (91 + 32 + 16 * 4) = 187.0 g/mol
molar mass of ZrCl₄ = (91 + 35.5 * 4) = 233.0 g/mol
molar mass of Cl₂ = (35.5 * 2) 71.0 g/mol
From the equation of reaction, 1 mole of ZrSiO₄ reacts with one mole of Cl₂ to produce one mole of ZrCl₄
number of moles of ZrSiO₄ present in 123 g = 123/187 = 0.65 moles
number of moles of Cl₂ present in 85.0 g = 85.0/71.0 = 1.19 moles
therefore, ZrSiO₄ is the limiting reactant
123.0 g of ZrSiO₄ will react with excess Cl₂ to produce 123 * 233/187 grams of ZrCl₄ = 153.3 grams of ZrCl₄
Therefore, 153.3 grams of ZrCl₄ are produced
BRIANLIEST!!!!!!
Use the mass to calculate the number of moles in a 347.89 g samples of ammonium
Answer:
20.46 moles
Explanation:
1 mole of NH3 contains 17gm of NH3
so 347.89 gm of ammonia is in,
347.89/17 moles
=20.46 moles
NOTE. There should be ammonia instead of ammonium in question because ammonium is an ion not a compound.
Chromosomes _____. (Choose all that apply)
1.) Are tightly coiled bundles of DNA
2.) Carry many genes
3.) Are found inside the nucleus of eukaryote
4.) Can be used to diagnose genetic disorders
5.) Outnumber genes in a cell
Answer:
1.) Are tightly coiled bundles of DNA
2.) Carry many genes
3.) Are found inside the nucleus of eukaryote
4.) Can be used to diagnose genetic disorders
Explanation:
A chromosome is a thread-like structure made up of DNA. The chromosomes are made of DNA which are tightly coiled around protein.
Chromosomes carry hundreds and thousands of genes. The number of genes in a cell outnumbers the number of chromosomes.
In eukaryotic cells, all the chromosomes are found inside the nucleus of eukaryote.
The chromosomes and DNA can be examined so as to diagnose genetic disorders.
Which substance can form a coordinate covalent bond with a hydrogen ion?
a. H2
b. He
c. NH3
d. CH4
The substance can form a coordinate covalent bond with a hydrogen ion is He. Hence, option B is correct.
What is covalent bond ?An electron exchange that results in the formation of electron pairs between atoms is known as a covalent bond. Bonding pairs or sharing pairs are the names given to these electron pairs.
Covalent bonding is the stable equilibrium of the attractive and repulsive forces between atoms when they share electrons.
Covalent bonds were first described in 1939. The word "covalent bond" is derived from the prefix co-, which means jointly, associated in action, partnered to a lesser extent, etc. The hydrogen atoms share the two electrons through covalent bonding since the prefix co- implies jointly, associated in action, etc.
Thus, option B is correct.
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How do you solve -8r=240
Answer:
You solve that dividing beach term by -8 and simplifying which for this answers will give you r=-30
Explanation:
Pls correct me if I’m wrong.
Hope this helps :)
Magnesium bromide is prepared in a laboratory using the reaction below. Typically, the magnesium bromide is recoveted as a solid by heating way the remaining water
Mg(s) + 2 HB-(aq) - MgBrac) + H200)
If 0.940 mole of HBr in solution is added to 16.5 grams of Mgo in a beaker and then is heated until dry, what are the expected contents of the beaker?
Write a 4-7 sentence summary on the topic Radiation. (don't mind the orange color)
Answer:
pa brainliest answer po pa heart pa follow me and back
Explanation:
SUMMURY
Radiation is energy. It travels in the form of energy waves or high-speed particles. Radiation can occur naturally or be man-made. ... Ionizing radiation, which includes ultraviolet radiation, radon, x-rays, and gamma rays.
Radiation is energy that comes from a source and travels through space at the speed of light. This energy has an electric field and a magnetic field associated with it, and has wave-like properties. You could also call radiation “electromagnetic waves”.
DIFFENITION :
radiation
1a: the action or process of radiating
b: the process of emitting radiant energy in the form of waves or particles
c(1): the combined processes of emission, transmission, and absorption of radiant energy
(2): the transfer of heat by radiation
— compare CONDUCTION, CONVECTION
2a: something that is radiated
b: energy radiated in the form of waves or particles
3: radial arrangement
4: ADAPTIVE RADIATION
a roller coaster train with a mass of 500 kg stops at the top of a hill if the hill is 110 m high what is the potential energy of the train
Answer:
Answer is 5000
Explanation:
5000 is your answer
Answer:
what the other person says their wright
Explanation:
stay safe 2021
Calculate the energy of a photon emitted when an electron in a hydrogen atom undergoes a transition from =3 to =1.
Answer:
[tex]1.936\times 10^{-18}\ \text{J}[/tex]
Explanation:
[tex]R_h[/tex] = Rydberg constant = [tex]2.178\times 10^{-18}\ \text{J}[/tex]
[tex]n_i[/tex] = Initial shell = 3
[tex]n_f[/tex] = Final shell = 1
We have the relation
[tex]\Delta E=R_h(\dfrac{1}{n_f^2}-\dfrac{1}{n_i^2})\\\Rightarrow \Delta E=2.178\times 10^{-18}(\dfrac{1}{1^2}-\dfrac{1}{3^2})\\\Rightarrow \Delta E=1.936\times 10^{-18}\ \text{J}[/tex]
The energy of the photon emitted here is [tex]1.936\times 10^{-18}\ \text{J}[/tex].
What is the amount of diamine silver that can be formed when 10.00 g AgCl is mixed with 1.00 L of 0.100 M NH3?
The amount of diamine silver chloride = 8.87 g
Further explanationGiven
10 g AgCl
1.00 L of 0.100 M NH3
Required
the amount of diamine silver
Reaction
AgCl + 2 NH₃ → [Ag(NH₃)₂]Cl
mol AgCl :
= mass : MW
= 10 g : 143,32 g/mol
= 0.0698
mol NH₃ :
= M x V
= 0.1 x 1
= 0.1
NH₃ as a limiting reactant
mol [Ag(NH₃)₂]Cl based on NH₃ :
= 1/2 x mol NH₃
= 1/2 x 0.1
= 0.05
Mass diamine silver :
= 0.05 x 177.3822 g/mol
= 8.87 g
If you have 90L of water, what is the volume?
Answer:
900
Explanation:
Which of the following is an example of a ball of clay undergoing a physical change?
I. The ball is thrown into the air
II. The ball is broken into two separate halves
lll. The ball is rolled along the ground
lV. The ball is flattened into a pancake like shape
Answer:
II. The ball is broken into two separate halve. The ball is still a ball. It is just in a different form.
IV. This one is also correct because it is only changing the physical state of the ball. The ball is still a ball.
When a negatively charged beta particle is emitted by a radioactive nucleus which change happens in the nucleus?
a. The number of protons increased by one
B. The number of neutrons increased by one
C. The number of nucleons increased by one
D. The number of nucleons decreased by one
Answer:
d
Explanation:
its d because a beta particle has a negative charge
In the case when there is the negatively charged beta particle so the number of nucleons decreased by one.
What are nucleons?In terms of chemistry and physics, a nucleon could be treated as the proton or neutron also it considered as the component of the atomic nucleus. Here the no of nucleons in the nucleus should represent the atom mass number.
So based on this, we can conclude that In the case when there is the negatively charged beta particle so the number of nucleons decreased by one.
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y = (x-16)2 A. Shift the graph of y = x2 down 16 units. B. Shift the graph of y= x2 right 16 units. C. Shift the graph of y = x2 left 16 units. D. Shift the graph of y = x2 up 16 units.
Answer:
Uhmm i think i dont know the sent r 6un Dury r in eyeing in d7ue
Which statement describes why the viscosity of water is lower than that of
olive oil?
A. The molecules that make up water have more kinetic energy than
the molecules that make up olive oil.
B. The molecules that make up water can more easily slide past one
another than the molecules that make up olive oil.
C. The molecules that make up water have less kinetic energy than
the molecules that make up olive oil.
D. The molecules that make up water are larger than the molecules
Answer:
Option B. The molecules that make up water can more easily slide past one another than the molecules that make up a olive oil.
The molecules that make up water can more easily slide past one another than the molecules that make up olive oil. Hence, option B is correct.
What is viscosity?Viscosity is a term used to describe FLUIDS, which includes liquids and gases. Viscosity refers to the ability of a gas or liquid to resist flow.
Olive oil has a higher viscosity than water because it is a much larger molecule than water with larger dispersion forces.
Hence, option B is correct.
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9. Carbon-14 has a half-life of 5,730 years. How many years have passed after 3
half-lives?
Answer:
120 gram sample of a radioactive element, how many grams of that element will be left after 3 half-lives have passed? If you have a 300
Explanation:
Hope this helps!
TRUE OR FALSE
If mechanical energy is conserved, the kinetic energy you end up with always equals the potential energy you lost.
........false.........
Please help...Thank so much!!
Answer:
what????????????????????
Answer:
1. ?
Explanation:
I'm not really sure, but knowing that gas particles are constantly moving makes me think that an ideal gas sample would have constantly moving particles. also with 2., gas has a lot of energy and their particles rarely come into contact with each other (they're even thought of as more independent than as one substance); with 3., there isn't much of a force between gas particles, which is why they're able to stay in that state of matter; and with 4., well, volume is important lol.
But the kinetic molecular theory states that games are composed of a large number of particles that behave like hard, spherical objects in a state of constant, random motion, so I'm sticking with the answer being number 1.
True or false.
“Sleeping does not give us energy, but is important because it helps us repair wounds; think better, grow and survive.”
hurry pls pls plsss
Answer:
False
Explanation:
At room temperature , 1 mL of water has a mass of 1 gram . What is the percent by mass of a 428 mL magnesium citrate ( solution containing 0.1 mol of magnesium citrate ?
Answer:
5.0% by mass
Explanation:
Percent by mass is 100 times the ratio between the mass of solute (Magnesium citrate) in the mass of solution.
Mass of Magnesium citrate -Molar mass: 214.41g/mol-:
0.1mol * (214.41g/mol) = 21.441g
Assuming the volume of the solution is just due the solvent -Water-, the mass of water is 428g.
Percent by mass is:
21.441g / 428g * 100 =
5.0% by massPV=nRT is an example that deacribes the relationship between pressuee, volume,moles and temperature of a gas. This is an example of a
Answer:
This is an example of Avogadro equation
statement that accurately describes broadleaf trees??
Answer:thy have needle like leave
Explanation:
Answer:
dzfz d vfg
Explanation:
bnnbvmyjggbbdfg
21.Electromagnetic radiation can take the form of which of the following types of waves
a.Heat
b.Light
c.Ultraviolet
d.All of the above
What mass of potassium chloride, KCl, is produced when 12.6 g of oxygen, 02, is produced?
Mass of KCl= 19.57 g
Further explanationGiven
12.6 g of Oxygen
Required
mass of KCl
Solution
Reaction
2KClO3 ⇒ 2KCl + 3O2
mol O2 :
= mass : MW
= 12.6 : 32 g/mol
= 0.39375
From the equation, mol KCl :
= 2/3 x mol O2
= 2/3 x 0.39375
=0.2625
Mass KCl :
= mol x MW
= 0.2625 x 74,5513 g/mol
= 19.57 g
Use the periodic table to determine the molar mass of each of the following elements. Use the correct number of significant figures.
Potassium (K):
g/mol
Osmium (Os):
g/mol
Manganese (Mn):
g/mol
Answer:
Potassium (K): 39.10 g/mol
Osmium (Os): 190.23 g/mol
Manganese (Mn): 54.94 g/mol
Explanation:
Just got it right on Edge 2021
The molar mass of the following elements are
Potassium (K): 39.10 g/mol
Osmium (Os): 190.23 g/mol
Manganese (Mn): 54.94 g/mol
What is molar mass?The molar mass of a substance is grams of one mole of that substance.
It can be calculated by dividing the atomic weight of the element, and the number of atoms found in that element.
Manganese is a transition metal with the atomic number 25.
Potassium is an essential mineral that is an alkali metal and its atomic number is 19.
Osmium is also a transition metal whose atomic number is 76.
Thus, the molar mass of the elements are, Potassium (K): 39.10 g/mol
Osmium (Os): 190.23 g/mol
Manganese (Mn): 54.94 g/mol
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Stoichiometry :
2 AlCl3 + 3 MgSO4 --> Al2(SO4)3 + 3 MgCl2
If 633.1 g AlCl3 reacts, how many moles of MgCl2 are formed?
can someone help please?
Answer:
Genetic Factors: Bad tasting leaves, plant structure, types of stems, reproduction
Environmental: insects, pollution, terrain, soil conditions, pH of soil, fire, flood, heat wave, temperature, lack of air, drought,
Explanation:
Genetic factors are within the organism, the plant's own make-up. Environmental factors are conditions on the outside, in the soil, the atmosphere, and other organisms in the habitat.