Answer:
200
Explanation:
23 rounds down to 20
7 rounds up to 10
20 times 10 equals 200
Calculate: A. What is the specific heat of plastic when 440 Joules of heat are radiated on a 140 gram slab of plastic which changes temperature from 20 -22 oC?
Answer:
1.571 J/g°C
Explanation:
Using Q = mc∆T
Where;
Q = amount of heat in Joules
m = mass of substance (grams)
c = specific heat capacity
∆T = change in temperature (°C)
According to the question;
m = 140g, Q = 440J, ∆T = 22°C - 20°C = 2°C
Using Q = mc∆T
c = Q/m∆T
c = 440/ 140 × 2
c = 440/280
c = 1.571 J/g°C
What is enthalpy and how is it different than heat?
Answer:Heat is a transfer of energy due to a temperature difference. Enthalpy is the change in amount of heat in a system at constant pressure. You can only use heat and enthalpy interchangeably if there is no work being done to the system.
Explanation:
If a balanced reaction takes place in a sealed container, how should the mass before the reaction begins compare to the mass after
the reaction ends?
If a balanced reaction takes place in a sealed container, how should the mass before the reaction begins compare to the mass after the reaction ends will always be equal to the reactant or same.
What is balanced reaction?A balanced reaction or chemical reaction is that the amount or mass of the reactant will always be equal to the amount of the product after the reaction is complete.
If A and B are two reactant then their concentration will be equal to the product which is C and D the number of moles taking participate is also equal.
Therefore, a balanced reaction takes place in a sealed container, the mass before the reaction begins compare to the mass after the reaction ends will be equal as reactant or will be the same.
Learn more about balanced reaction, here:
https://brainly.com/question/14263388
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How many moles are there in 5.80 X 1024 molecules of sodium sulfate, Na2SO3?
Answer:
[tex]\boxed {\boxed {\sf 9.63 \ mol \ Na_2SO_3}}[/tex]
Explanation:
To convert from molecules to moles, Avogadro's Number: 6.02*10²³ must be used. This number is the amount of particles (molecules, atoms, etc.) in 1 mole of a substance. In this case, the particles are molecules of sodium sulfate. Let's create a proportion.
[tex]\frac{ 6.022 *10^{23} \ molecules \ Na_2SO_3}{1 \ mol \ Na_2SO_3}[/tex]
Multiply by the given number of molecules.
[tex]5.80 *10^{24} \ molecules \ Na_2SO_3 *\frac{ 6.022 *10^{23} \ molecules \ Na_2SO_3}{1 \ mol \ Na_2SO_3}[/tex]
Flip the fraction so the molecules of sodium sulfate cancel.
[tex]5.80 *10^{24} \ molecules \ Na_2SO_3 *\frac{ 1 \ mol \ Na_2SO_3}{6.022 *10^{23} \ molecules \ Na_2SO_3}[/tex]
[tex]5.80 *10^{24} *\frac{ 1 \ mol \ Na_2SO_3}{6.022 *10^{23}}[/tex]
[tex]\frac{ 5.80 *10^{24} \ mol \ Na_2SO_3}{6.022 *10^{23}}[/tex]
Divide.
[tex]9.63135171 \ mol \ Na_2SO_3[/tex]
The original measurement has 3 significant figures (5, 8, and 0), so our answer must have the same.
For the number we calculated that is the hundredth place. The 1 in the thousandth place tells us to leave the 3.
[tex]9.63 \ mol \ Na_2SO_3[/tex]
There are about 9.63 moles of sodium sulfate
periodiate has how many oxygen
2
3
4?
Answer:
4
Explanation:
it has 4 oxygen
hope this helps
Answer:
The law companies that value excessive ethics comply with the legal guidelines not solely in letter however go past what
The diameter of a circle is 14 kilometers. What is the circle's circumference?
Answer:
C = 43.96
Explanation:
Formula:
C = 2πr
r = 14/2 = 7
C = 2(3.14)(7)
C = 43.96
If 3.1 moles of potassium chloride react with oxygen, how many moles of potassium chlorate would be produced?
Answer: 19 dollar fortnite card Explanation:who wants it
What effect does water have on the viscosity of magma?
Answer:
Water decreases the viscosity of magma, which is basically how thick or runny a liquid is.
Which of the following would be a part of an environment engineer's job description ?
Answer:
where is the options
Explanation:
give options
Please helppppppppppppppppppp
50 ppoints
Answer:
I can’t see the whole page
Explanation:
what type of bond does carbon and sulphur form when they react. explain
Answer:
covalent bonding becaus of there both non metals
Which of the following traits in inherited?
)piano skills
)strong muscles
)sun - bleached hair
)height
Sun-Bleached hair.
You can't exactly pass down piano skills, they have to be taught and also you can't just be born with strong muscles, they also have to develop over time. Height can't exactly be passed down because some parents are tall and their kids come out short. That leaves the only other option to be Sun-Bleached Hair (hair color).
Hope this helps and have a nice day.
-R3TR0 Z3R0
How many moles are in 1.51 x 10^24 molecules of water?
Answer:One mole of HBr has 6.02 x 1
0
23
molecules of HBr.
1 mole of HBr = 6.02 x 1
0
23
molecules of HBr.-----(a)
X mole of HBr has 1.21 x
10
24
molecules of HBr.
X mole of HBr = 1.21 x
10
24
molecules of HBr------(b)
Taking ratio of (a) and (b)
X / 1 = 1.21 x
10
24
/ 6.02 x 1
0
23
X= 2.009 moles.
Explanation:
what is on the left side ?
Answer:
reactants
Explanation:
I NEED HELP PLS PLS PLS
I can be formed into a sheet, I am high in luster, and am a very good conductor. I must be a ...
a
metal
b
nonmetal
c
metalloid
d
noble gas
Answer: metal
Explanation:
Using the heat capacity of water (1 cal/g oC), determine how much energy was released by the combustion of the wax.
Answer:
hello some part of your question is missing below is the missing part
1. Mass of water in the boiler 336.6g 2. Mass of wax burn 0.289g 3. Increased in the temperature 6.6 C
and change to Joules and to kilojoules
answer : 9.295 kJ
Explanation:
Calculate how much energy was released by the combustion of the wax
ΔT = 6.6°C
Note :The energy released by the combustion of wax is absorbed by the water
heat = mass * specific heat capacity * ΔT
= 336.6 * 1 * 6.6 = 221.56 cal
convert; 221.56 cal to J
= 221.56 * 4.184 = 9295.0 J
hence the energy released by the combustion of the wax = 9.295 kJ
A compound MBr4 has a relative formula mass of 439
What is the relative atomic mass of M (Br=80)
Answer:
119
Explanation:
because the molecular mass of MBr can be found by adding the individual atomic masses of the molecule
Molar mass of M + 4(Molar mass of Br)= Molar mass of
MBr
Molar mass of M +4(80)= 439
Molar mass of M +320 = 439
Molar mass of M = 439 -320
Molar mass of M =119
where do the letters go help me plz
Answer:
For d I'm pretty sure its Organ System, I apologies if I am wrong
which two statements correctly describe the theory of plate tectonices
Answer:
It explains how continents have shifted over time and It was developed based on data that scientists collected about the ocean floor.
The graph shows temperature anomalies for Earth over the
last 800,000 years. A temperature anomaly is a variation
from the average temperature. A positive temperature
anomaly indicates a temperature that is higher than
average.
-600,000
-800,000
-200,000
-400,000
Year
Which two trends do the data show?
Please help ASAP !!
Answer:multiple periods of warmer, and there are natural cycles or warmer.
Explanation: trust me
you want 200 mL of a 0.1 g/mL solution of sugar. how do you prepare the solution?
(they don't have science so I guess cemastry will do.)
warm air rises because of___
A student holds the back of his hand near an iron tosee if it's hot. The heat transfer is___
Warm water moves throuout a mattress because of___
In a swimmming pool The watter near the surface is warmer because of___
(i'll do the rest later)
warm air rises because of convection.
A student holds the back of his hand near an iron to see if it's hot. The heat transfer is conduction.
Warm water moves throughout a mattress because of ... why is there warm water in a mattress again? Convection, I guess.
In a swimming pool, the water near the surface is warmer because of convection and solar radiation; it's closer to the Sun than the bottom of the pool, so it receives more thermal radiation, making it warmer.
Uranium has an atomic number of 92. How many neutrons does U-238 have?
Answer:
146 neutrons.
Explanation:
i need a short paragraph (about two sentences) describing the geologic time scale.
The geologic time scale is the “calendar” for events in Earth history. It subdivides all time into named units of abstract time called—in descending order of duration—eons, eras, periods, epochs, and ages.
4) How many atoms are present in a sample of oxygen, O2 with 12.222 moles?
Answer:
two oxygen atoms
Jayden says that the dentist can shine a special light on his teeth that will make his teeth become whiter. Can light change Jayden’s teeth?
Answer:
No
Explanation:
This is because light cannot not whiten Jayden's teeth but light can change materials by hearing it up. There are some substances or tooth paste that can be use to whiten the teeth because of the content they are made off which whitens the teeth. Some of it include baking soda, hydrogen peroxide toothpaste, tumeric toothpaste, toothpaste that contain fluoride.
PLEASE HELP WILL GIVE BRAINLIEST AND 100 POINTS
the answer to your question is C
3. The total pressure of helium and Argon gas in a closed cylinder is 3.0 atm. If the partial pressure of the Argon is 0.365 atm, what is the partial pressure of the helium?
what is the cation and anion formula for each compound
Answer:
cation ca2+ anion cl-
Explanation:
please see the picture your answer is there