The temperature of 170 g of a material decreases by 20.0⁰C when it loses 3050 J of heat. What is its specific heat
Answer:
0.897 J/g.⁰C
Explanation:
Given the following data:
m = 170 g (mass)
ΔT = 20.0⁰C (change in temperature)
q = 3050 J (amount of heat)
The amount of heat (q) is calculated as follows:
q = m x Cp x ΔT
Thus, we introduce the data in the mathematical expression to calculate the specific heat (Cp):
Cp = q/(m x ΔT) = 3050 J/(170 g x 20.0⁰C) = 0.897 J/g.⁰C
Which 2 minerals can be scratched by a Diamond but NOT Quartz
Answer:
topaz and corundum
Explanation:
i know things
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:
Speed is the rate of change of position expressed as distance travelled per unit of time .
Explanation:
Which two moon phases can occur while the
relative positions of the sun, Earth, and moon
form a straight line?
Answer:
its the lunar and solar eclipse
Explanation:
the solar eclipse happens when the moon is in between the sun and earth
Can anyone help me I just have to name these
Cr(HSO2)6
Au(HTeO3)3
Answer:
the first on is Chromium(VI) peroxide or chromium oxide peroxide
the second on it Hydrogen Carbonate
Explanation:
I hope this helped ;)
What is the wavelength of a photon with a frequency of 7.81 x 1014 Hz?
Explanation:
If you know the frequency of the photon, you can calculate the wavelength using the equation λ=cν where c is the speed of light and ν is the frequency.
λ=cν
f=T^-1,f=1/7.81×1014s
c=3×10^8m/s
λ=3×10^8m/s×1/7.81.×1014s
λ=37881.94m
convert 5.0 moles NH3 to mass
Answer:
85 g
Explanation:
molar mass of NH3 = 17 (get individual atom mass from periodic table and add)
to convert moles to grams use dimensional analysis
(5 mol) x (17 g / 1 mol) basically just do 5 x 17
= 85 :)
When calcium carbonate is heated strongly, carbon dioxide gas is evolved. CaCO3(s) → CaO(s) + CO2 (g) If 4.74 g of calcium carbonate is heated, what volume of CO2 (g) would be produced when collected at STP?
Answer:
1.06 liters of gas are produced
Explanation:
Our reaction is:
CaCO₃(s) → CaO(s) + CO₂ (g)
This is the decomposition of calcium carbonate.
Ratio is 1:1:1
1 mol of carbonate can decompose to 1 mol of oxide and 1 mol of oxygen.
We convert mass to moles:
4.74 g . 1 mol /100.08g = 0.0474 moles
These are the moles of oxygen produced.
We know that 1 mol of any gas at STP is contained in 22.4L
0.0474 mol . 22.4L /mol = 1.06 L
zinc crystals is made from zinc Oxide and which acid
Answer:
hydrochloric acid
Explanation:
Zinc oxide will react with hydrochloric acid to form zinc chloride and water.
sulphuric acid
So to make zinc sulphate crystals you add granulated zinc to heated sulphuric acid
which do you think will warm up the plate more quickly?
A. Direct sunlight
B.Indirect sunlight
Answer: B
your welcome Bsbssnsnsmsllqql
How does a nuclear power plant create electricity?*
A: A nuclear reaction burns fuel
B: A nuclear reaction caused water to flow, which is then what creates electricity
C: A nuclear reaction creates heat which is applied to water to create steam
D: A nuclear reaction creates an electrical current
Answer:
CExplanation:
Answer:
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Researchers are studying a fish population in a small pond that has algae as the only producer in the ecosystem. The scientists are concerned about what might happen to the fish, if the algae suddenly disappear. Why is this a concern? What might be done to prevent this from occurring?
Explanation:
Algae is a group of a photosynthetic eukaryotic organisms that plays a very important role on the ecosystem. It forms the lower base of the food chain and supports all the life forms of the ecosystem. It takes up water and carbon dioxide from the atmosphere to prepare food during the process of photosynthesis and maintains a balance in the ecosystem.
In the context, if the algae disappears, the fish might die as the small fishes feeds on this algae. This is a concern as the algae is main component of food source and forms the base of the food chain. If there will be no algae there will be no life form on earth, as all species depend on each other to survive.
In order to prevent this from occurring, we must protect our algae. We must plant more trees, keep our water bodies healthy, we should not litter our ponds and lakes. We should also help these algae to grow and survive so that other life forms can feed them and thus maintain the ecosystem.
Why can more water vapor (water molecules that are in the gas state of matter) be present in warm air than in cold air?
Answer:
Because warm air is less dense
Explanation:
how has the study of fossil rocks evolved over time? (personal answer)
Answer:
When an organism dies, it is usually destroyed by other forms of life and by weathering processes. On rare occasions some body parts—particularly hard ones such as shells, teeth, or bones—are preserved by being buried in mud or protected in some other way from predators and weather. Eventually, they may become petrified and preserved indefinitely with the rocks in which they are embedded. Methods such as radiometric dating—measuring the amounts of natural radioactive atoms that remain in certain minerals to determine the elapsed time since they were constituted—make it possible to estimate the time period when the rocks, and the fossils associated with them.
A gas sample has a volume of 300.0 L when under a pressure of 3atm. What is the
new volume iſ the pressure is increased to 4 atm while the temperature is held
constant?
200L
225L
300L
900L
Answer:
V1P1=V2P2
300*30=x*40
900=40x
decide both side by 40to be left by volume x
900÷40=x
x=225L
Solutions that are very concentrated have greater freezing point depression Group of answer choices true or false
Answer:
Explanation:
False. The greater the concentration, the lower the freezing point.
Please help I’m timed !!!
Determine the percent dissociation of a 0.18 M solution of hypochlorous acid, HClO. The Ka for the acid is
3.5 x 10-8
Оа
Oь
Ос
Od
7.9' 10-3 %
4.4'10-2%
6.3' 10-9%
3.5' 10-6 %
Answer:
b. [tex]\% diss =4.4x10^{-2}\%[/tex]
Explanation:
Hello there!
In this case, given the ionization reaction of HClO as weak acid:
[tex]HClO\rightleftharpoons H^++ClO^-[/tex]
We can write the equilibrium expression as shown below:
[tex]Ka=3.5x10^{-8}=\frac{[H^+][ClO^-]}{[HClO]}[/tex]
In such a way, via the definition of x as the reaction extent, we can write:
[tex]3.5x10^{-8}=\frac{x^2}{[HClO]}[/tex]
As long as Ka<<<<1 so that the x on the bottom can be neglected. Thus, we solve for x as shown below:
[tex]x=\sqrt{3.5x10^{-8}*0.18} =\\\\x=7.94x10^{-5}M[/tex]
And finally the percent dissociation:
[tex]\% diss=\frac{x}{[HClO]} *100\%\\\\\% diss=\frac{7.94x10^{-5}M}{0.18}*100\% \\\\\% diss =0.044\%=4.4x10^{-2}\%[/tex]
Which is choice b.
Best regards!
What is the electric potential in volts if the electrical potential energy is 10 joules and the charge is 5 coulombs
Answer:
2 volts
Explanation:
I got that answer through a long process
The FM station broadcasts traditional music at 102 MHz on your radio units for FM frequencies are given in MHz. Find the wave length of radio station in metres (m), nanometre(nm) and angstrom(Å).
Answer:
λ = 2.94 m (in meters)
λ = 2.94 x 10⁹ nm (in nanometers)
λ = 2.94 x 10¹⁰ A (in angstrom)
Explanation:
The wavelength of the radio station can be given as follows:
[tex]\lambda = \frac{c}{f}\\[/tex]
where,
λ = wavelength = ?
f = frequency = 102 MHz = 1.02 x 10⁸ Hz
c = speed of light = 3 x 10⁸ m/s
Therefore,
[tex]\lambda = \frac{3\ x\ 10^8\ m/s}{1.02\ x\ 10^8\ Hz}[/tex]
λ = 2.94 m (in meters)
λ = (2.94 m)(10⁹nm / 1 m)
λ = 2.94 x 10⁹ nm (in nanometers)
λ = (2.94 m)(10¹⁰ A / 1 m)
λ = 2.94 x 10¹⁰ A (in angstrom)
A child has a toy balloon with a volume of 1.75 liters. The temperature of the
balloon when it was filled was 21° C and the pressure was 1.00 atm. If the child
were to let go of the balloon and it rose 3 kilometers into the sky where the
pressure is 0.65 atm and the temperature is -10°C, what would the new volume
of the balloon be?
Answer:
2.41 Litres
Explanation:
Using the combined gas law equation as follows;
P1V1/T1 = P2V2/T2
Where;
P1 = initial pressure (atm)
P2 = final pressure (atm)
V1 = initial volume (L)
V2 = final volume (L)
T1 = initial temperature (K)
T2 = final temperature (K)
According to the information provided in this question;
P1 = 1 atm
P2 = 0.65 atm
V1 = 1.75 liters
V2 = ?
T1 = 21°C = 21 + 273 = 294 K
T2 = -10°C = -10 + 273 = 263 K
Using P1V1/T1 = P2V2/T2
1 × 1.75/294 = 0.65 × V2/263
1.75/294 = 0.65V2/263
Cross multiply
294 × 0.65V2 = 1.75 × 263
191.1 V2 = 460.25
V2 = 460.25 ÷ 191.1
V2 = 2.41 L
The total pressure of all the gases inside a metal container is 9.8 atm. If the partial pressure of the oxygen in the container is 4.2 atm, what is the partial pressure of the rest of the gases in the container other than the oxygen?
5.6 atm is the partial pressure of the rest of the gases in the container other than the oxygen.
What is partial pressure?Each gas in a mixture adds to the overall pressure of a mixture. This portion represents the pressure. The pressure a gas would have if it were in its own volume and at its own temperature is known as the partial pressure. According to Dalton's law, the pressure distribution of an ideal gas mixture is equal to the combined partial pressures of the component gases.
The study of partial pressure is significant in the domains of physics, chemistry, and biology. The partial pressure of oxygen or carbon dioxide in the blood is used to calculate blood levels of each substance. The overall pressure in a container is equal to the sum of the partial pressures. The remaining gases must make up the remaining 5.6 atm if the oxygen partial pressure equals 4.2 atm and the sun reaches 9.8 atm in pressure.
Therefore, 5.6 atm is the partial pressure of the rest of the gases in the container other than the oxygen.
To know more about partial pressure, here:
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URGENT PLEASE HELP ILL MARK BRAINLIST Please someone look at the graph and tell me how to fill in the blank like you don't need to do it jsut tell me how and I'll do it myself I jsut don't understand how the instructions are using your periodic table fill in the chart below to show how many elements combine ironically to form neutral compounds remebr that each compound needs to have a total charge of zero URGENT PLZ FOR.THE LOVE OF GOD PLEASE ANSWER THIS
Answer:
Filled below
Explanation:
#v.e means number of valence electrons.
Also, the column total v.e is gotten by adding the v.e of the metal to the v.e of the non metal based on the chemical formula of both of the 2 elements combined.
K: Cl: 5; KCl; 1 + 5 = 6
Be: S: 6; BeS; 2 + 6 = 8
Na: F: 7; NaF; 1 + 7 = 8
Mg: Se: MgSe; 2 + 6 = 8
Al; N; AlN; 1 + 5 = 6
Be; F; BeF2; 2 + 2(7) = 16
Mg; N; Mg3N2; 3(2) + 2(7) = 20
how many grams are 7x10^22 molecules of NaOH
Answer:
you probably not Finn look at this from 1 week
Explanation:
sooo ug
Explain why all other atoms are reactive?
Answer:
The number of electrons in the outermost shell of an atom determines its reactivity. Noble gases have low reactivity because they have full electron shells. Halogens are highly reactive because they readily gain an electron to fill their outermost shell.
Hope this Helps!~
Bones connect to each other at .......
CSC Unit 3
Question 28 of 33
Which of the following molecules has a trigonal-pyramidal shape?
A. SeF6
B. SO2
C. BH3
D. PH3
Which of the following represents an alpha particle?
O A. je
B. He
O C. Y
O D.B
Answer:
Alpha particle- B. He (Helium 4 atom )
He represents an alpha particle and the correct option is option B.
What is an alpha particle?Alpha particles are alternatively known as Alpha radiation or Alpha rays. It is a positively charged particle emitted from the decay of various radioactive materials.
They are emitted from the nucleus of some radionuclides during a form of radioactive decay, called alpha-decay.
Alpha particle mass is due to the two protons and two neutrons bonding.
An alpha-particle is identical to the nucleus of a normal (atomic mass four) helium atom i.e. a doubly ionised helium atom.
Therefore, He represents an alpha particle and the correct option is option B.
Learn more about Alpha particles, here:
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A sheet of muscles called the diaphragm seals the bottom of this cavity true or false?<br />
The blood transports the oxygen to every cell in the body true or false?<br />
The cells need carbon dioxide to release energy true or false?<br />
Carbon Dioxide is a waste product of respiration true or false?<br />
Water is needed in the cells for respiration to occur true or false?<br />
Glucose is made during the respiration true or false?<br />
Respiration does not happen in the cells when we sleep true or false?<br />
Air enters the body through the nose and mouth, and passes into the wind pipe of the trachea true or false?
Answer:
1. False. White blood cells do.
2. False. Every seven years your cells are in the process of dying and being replaced. Although some cells don't die but your cells don't last for more than a period of 7 years.
3. True.
4. True.
5. False.
Explanation:
Describe what is wrong with this sentence:
"When you kick a soccer ball, you create new
kinetic energy!"
Answer:
You transfer kinetic energy from you foot to the ball.
Explanation:
Energy cannot be created or destroyed.
Answer:
hi..,......
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What is the specific heat of a metal (in J/g℃) that weighs 150 g and absorbs 1.2 kJ (or 1,200 J) of heat when the temperature rises by 50.0℃?
Answer:
0.16 J/g℃
Explanation:
We have the following data:
heat = 1,200 J
mass of metal = m = 150 g
change in temperature = ΔT = 50.0℃
The heat absorbed is calculated by using the following equation:
heat = m x Cp x ΔT
So, we introduce the data in the equation to calculate the specific heat of the metal (Cp), as follows:
Cp = heat/(m x ΔT) = (1,200 J)/(150 g x 50.0℃) = 0.16 J/g℃