Wing practice problems:
1. How many grams of water could freeze at 0°C when 525 KJ of energy is released?
Answer:
g x 334 J/g = 3340J or 3.34kJ.
Explanation:
The energy required for one gram of a solid to melt without experiencing any temperature change is known as the heat of fusion. 3.34 KJ of energy is released.
What is heat of fusion ?The most typical illustration is when solid transforms into liquid water. The molecules within the substance become less structured as a result of this process, which is also known as melting or heat of fusion.
The change in enthalpy ( H ) that occurs when a substance transforms from a solid to a liquid state.
The amount of energy required for one gram of a liquid to evaporate (boil) without a change in pressure is known as the heat of vaporization.
Q = gram × 334 J / g
= 3.34 KJ
Thus, at 0°C when 525 KJ of energy released is 3.34 KJ.
To learn more about heat of fusion follow the link below;
https://brainly.com/question/14053504
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What did Rutherford contribute to the model of the atom?
the neutron
the proton
the nucleus
the electron
Answer:
the nucleus
Explanation:
He proposed that the mass of an atom is concentrated in the nucleus which occupies a small volume in the center .He added that the nucleus comprises the protons and neutrons.where the neutron had no charge while the protons had charge of +1
Answer:
the nucleus
Explanation:
Calculate the heat gained when 20.1 g ice at - 12.5 degrees * C is heated to liquid water 55.2 degrees * C
Answer:
66.8
Explanation:
Calculate that is what I did.
have a good day!
Examine your observations above and summarize the effects of each kind of radiation on the molecules in the simulation. Microwave Infrared Visible Light Ultraviolet Effect(s) on Molecules
Answer:
The effects of each kind of radiation is different on the molecules.
Explanation:
Microwave causes molecules that have two opposing poles to spin rapidly due to absorption of the electromagnetic radiation waves. When molecules absorb Infrared radiation, changes occur from a ground vibrational state to an excited vibrational state. When the visible light is absorbed by molecule, the electron is excited and goes to an orbital of higher energy than the lower energy. Ultraviolet radiation turns the stable molecule into a reactive species.
As time passes, which of these is decreasing?
es )
A)
amplitude
B)
crest
trough
D)
wavelength
Answer:
Wavelength (D)............
Answer:
A
Explanation:
the amplitude is measured from the dotted line to the top of the crest. Looking at the picture the amplitude gets smaller
How do rock transformations on Venus and Earth indicate the planetary similarities between the two planets?
Answer:
Both the Earth and Venus show the appearance of igneous rocks due to the cooling of the magma.
Explanation:
As we know, ignea rock is the first step in the transformation of rocks. This rock is formed by the overflow of terrestrial magma which, upon cooling, turns into ignea rock, which will undergo metamorphism and transform into metamorphic rock, which will continue to undergo metamorphosis until it becomes the other rocks that complete the rock cycle. This is a terrestrial process that can be found on Venus, which also presents the cooling of magma in the formation of ignea rock, which will undergo metamorphism, transforming into other rocks, the way it occurs on Earth.
If a substance has a half life of 58 years and starts with 500 g radioactive, how much remains radioactive after 30 years?
Answer:
A = 349 g.
Explanation:
Hello there!
In this case, since the radioactive decay kinetic model is based on the first-order kinetics whose integrated rate law is:
[tex]A=Ao*exp(-kt)[/tex]
We can firstly calculate the rate constant given the half-life as shown below:
[tex]k=\frac{ln(2)}{t_{1/2}} =\frac{ln(2)}{58year}=0.012year^{-1}[/tex]
Therefore, we can next plug in the rate constant, elapsed time and initial mass of the radioactive to obtain:
[tex]A=500g*exp(-0.012year^{-1} *30year)\\\\A=349g[/tex]
Regards!
WILL GIVE BRAINLYEST.
Part C is what I need help with I was just showing the other answers I got for you if it would help.
Question: Which time shows the highest composition of all green house gasses? Comment on any quantitative comparisons with the ice age data.
Answer:
Today has the highest composition of greenhouse gases
Explanation:
Greenhouse gases have been linked to the rise in the temperature of the earth. they are believed to trap infrared ray close to the earth surface thereby causing a steady rise in the temperature of the earth, a phenomenon that has been widely called global warming.
The concentration of greenhouse gases in the atmosphere today ranks highest among other ages due to anthropogenic activities.
During the ice ages, the concentration of greenhouse gases was slightly higher (especially C02) due to natural feedback mechanisms and not due to anthropogenic activities.
Mr. Romeo wants to make a solution of NaOH. He measures out 97.68 grams and puts it into 3 liters
What is the molarity of the solution he created? Round to 2 Decimal points
Answer: Molarity of the solution is 0.813 M.
Explanation:
Given : Mass of NaOH = 97.68 g
Volume of solution = 3 L
The molar mass of NaOH is 39.99 g/mol. Hence, moles of NaOH are calculated as follows.
[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{97.68 g}{39.99 g/mol}\\= 2.44 mol[/tex]
Molarity is the number of moles of solute present in a liter of solution. Therefore, molarity of given solution is calculated as follows.
[tex]Molarity = \frac{no. of moles of solute}{Volume (in L)}\\= \frac{2.44 mol}{3 L}\\= 0.813 M[/tex]
Thus, we can conclude that molarity of the solution is 0.813 M.
How much heat is gained by 1.25 grams of ice?
Answer:
Heat gained by 1.25 grams of ice is 250 joules
Explanation:
As we know
[tex]Q = mc\Delta[/tex]T
Where
[tex]\Delta[/tex]T is the change in temperature
Water freezes at 273.15 K/0 degree Celsius, and it boils at 373.15 K/00 degree Celsius,
[tex]\Delta[/tex]T
m is the mass in grams
c is the specific heat of water (ice) = 2.05 joules/gram
Substituting the given values, we get -
[tex]Q = 1.25 * 2.0 * 100\\Q = 250[/tex]Joules.
How do you write the formula for the combination of 2 chemicals?
example: al3+, br1-, and o2- combined would be what?
Explanation:
[tex]Al(Br)O _{3} \\ name \: = > \: aluminiummonobromo(iii)oxide[/tex]
A.6.10
B.90
C.6.00
6.20
Answer:
6.1
Explanation:
Because if you get to the large mark it would be 5 but since its not at 5, it would be 6.1 as you can see in my drawing. It aligns perfectly with 6.1.
Which object will experience the strongest gravitational attraction to Earth?
A. a car
B. a notebook
C. a desk
D. a bowling ball
Answer:
A
Explanation:
The strength of the gravitational force between two objects depends on mass and distance. The object with the greatest mass would be the car.
State of matter
A gas made up of homonuclear diatomic molecules escapes through a pinhole 3.98 times as fast as oxygen gas. Write the Chemical formula of the gas.
Answer:
H₂
Explanation:
To solve this question we must find, as first, find the molar mass of the homonuclear diatomic gas using Graham's law. With the molar mass we can identify this gas
Graham's law:
[tex]\frac{V_a}{V_b} =\sqrt{\frac{m_B}{m_A} }[/tex]
Where V is the speed of the gases and m the molar mass of those:
As Va is 3.98 times Vb (And mB is molar mass of oxygen gas = 32g/mol)
[tex]3.98 =\sqrt{\frac{32g/mol}{m_A} }[/tex]
15.84 = 32g/mol / mA
mA = 2.02g/mol
As is a homonuclear diatomic gas, the molar mass of the atom is 1.01g/mol. Thus, the gas is:
H₂A compound has an empirical formula of CH20. What is its molecular formula, if its molar mass is 360 g/mol?
a. C6H12O6
b. C12H24O12
Answer:
a
Explanation:
A actual molecule of glucose contains six carbon atoms, twelve hydrogen atoms, and six oxygen atoms.
Answer:
B.
Explanation:
(4x972)+(76.4x29.3)-(12x7)
solve using significant figures please ASAP
The balanced equation for the combustion of ethene is given below. If 97.7 g of oxygen is used, how much
heat energy will be produced?
C2H4+ 3O2 → 2CO2 + 2H2O + 1390 kJ
Answer:
c
Explanation:
It take 38.70cm³ of 1.90m NaoH to neutralize 10.30cm³ of H2so4 in a battery, calculate the molar concentration of H2so4
Answer:
[tex]M_{acid}=3.57M[/tex]
Explanation:
Hello there!
In this case, since this acid-base neutralization is performed in a 1:2 mole ratio of acid to base as the former is a diprotic acid (two hydrogen ions in the molecule), we can write the following equation:
[tex]2M_{acid}V_{acid}=M_{base}V_{base}[/tex]
In such a way, we can solve for the molarity of the acid, given the molarity and concentration of the NaOH base and the volume of the acid:
[tex]M_{acid}=\frac{M_{base}V_{base}}{2V_{acid}}[/tex]
Thus, we plug in the given data to obtain:
[tex]M_{acid}=\frac{38.70cm^3*1.90M}{2(10.30cm^3)} \\\\M_{acid}=3.57M[/tex]
Best regards!
How many kJ are needed to heat 300.0 g of ice at -5.00°C into steam at 100.°C?
Answer:
Q = 63.9 kJ
Explanation:
Given that,
Mass of ice, m = 300 g
We need to find the heat needed to heat the given amount of ice at -5.00°C into steam at 100.°C
The specific heat of ice, c = 2.03 J/g °C
The formula for heat needed is given by :
[tex]Q=mc\Delta T\\\\Q=300\times 2.03\times (100-(-5))\\\\Q=63945\ J\\\\Q=63.9\ kJ[/tex]
So, 63.9 kJ of heat is needed.
If I held a heavy rock up 6 feet from the ground and kept it completely still, what kind of energy does it have?
Answer:
kenetic
Explanation:
<3
Which type of star has the greatest temperature on the HR diagram? Question 7 options: Red Supergiants Main Sequence White Dwarfs Red Giants
Answer:
Red Super Giants
Explanation:
Beacuse of the of their size, the core temperature is more hotter then White Dwarfs and Red Giants.
Answer:
Red Super Giants
Explanation:
Their core is the hottest.
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Speed is the rate of change of position expressed as _____ traveled per unit of time. A. direction B. meter C. displacement D. distance... Help!!!
Answer:
Distance
Explanation:
You mix two amino acids together: glu and ser. If they reacted, how many different dipeptides would you expect to get? List them.
I'm really struggling with amino acids, so any help is appreciated! I won't be clicking any links, though.
Answer:
Answers 1. An amide linkage between the carboxyl group of one amino acid and the amine group of the other amino acid. 2. An ester is a compound formed from the reaction of a carboxylic acid and an alcohol. ( I apologise, I cant figure out number 3.. )
HELP PLEASE 40.0 grams of salt are dissolved in 100. grams of water. The solution is how many grams?
Answer:
The mass of the solution is 140 grams.
Explanation:
The mass of the solution is given by the sum of the solute's mass and the solvent's mass:
[tex] m_{sol} = m_{ste} + m_{svt} [/tex]
Where:
[tex] m_{sol} [/tex]: is the mass of the solution
[tex]m_{ste}[/tex]: is the mass of the solute
[tex]m_{svt} [/tex]: is the mass of the solvent
The solute is the salt (40.0 g) and the solvent is the water (100 g), so:
[tex] m_{sol} = m_{ste} + m_{svt} = 40 g + 100 g = 140 g [/tex]
Therefore, the mass of the solution is 140 grams.
I hope it helps you!
calculate the molar mass for BaSO4
Answer:
233.38 g/mol
Explanation:
you find the molar mass of each element and then add them up.
You need to prepare .200M solution of hydrochloric acid (HCl). If you took out .830ml of the 12.0M stock solution. How much water must you add to make the .200M diluted solution?
Answer:
You must add 48.97 mL of water to make the 0.200 M diluted solution.
Explanation:
In chemistry, dilution is the reduction in concentration of a chemical in a solution. In other words, it is the process of reducing the concentration of solute in solution, simply adding more solvent to the solution.
In a dilution, the quantity or mass of the solute is not changed but only that of the solvent. As only solvent is being added, by not increasing the amount of solute the concentration of the solute decreases.
The expression for the dilution calculations is:
Cinitial* Vinitial = Cfinal* Vfinal
In this case:
Cinitial= 12 MVinitial= 0.830 mLCfinal= 0.200 MVfinal= ?Replacing:
12 M*0.830 mL= 0.200 M*Vfinal
Solving:
[tex]Vfinal=\frac{12 M*0.830 mL}{0.200 M}[/tex]
Vfinal= 49.8 mL
Since 0.830 mL is the volume you initially have of HCl, the amount of water you must add is:
49.8 mL - 0.830 mL= 48.97 mL
You must add 48.97 mL of water to make the 0.200 M diluted solution.
Describe the motion of particles in a
solid compared with a liquid or gas.
Graphene is made of pure _______________.
Answer:
Graphene is made of pure carbon.
Explanation:
It is a material in which the carbon atoms are arranged in a single layer, creating a honeycomb pattern. It should be stressed that this layer of carbon is only one atom thick, although some authors consider up to ten layers of carbon to be graphene.
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answer asap pls i give brainliest
Answer:
B. Revolution is a planet's movement around the sun causing four seasons the occur. Rotation is the spinning of the planet on its axis causing day and night.
A sample of gas is inside of a rigid container with fixed volume of 350mL. The initial pressure of the system is 366kPa, and the initial temperature is 88 degrees Celsius. How would the pressure of the system change if the temperature was increased to 110 degrees Celsius?
Answer:
457.5kPa
Explanation:
Given data
V1=V2=350mL (fixed volume )
P1=366kPa
T1= 88 degrees Celsius
P2=??
T2= 110 degrees Celsius
For the general gas equation
P1V1/T1= P2V2/T2
V1=V2
P1/T1= P2/T2
Substitute
366/88= P2/110
Cross multiply we have
P2*88=366*110
P2*88= 40260
P2= 40260/88
P2= 457.5 kPa
Hence the pressure will change to 457.5kPa