Answer:
Cannot be measured by pyrometer.
Explanation:
This is because a pyrometer measures temperatures for very hot bodies such as the sun.
Answer:
Clinical
Explanation:
Temperature of boiling water cannot be measured by a Clinical thermometer The reason behind this is that the range of clinical thermometer varies between only 35° C to 42° C.
2CuO+2NH3------ 3Cu + 3H2O+ N2. Given that the relative molecular mass of copper oxide is 80, what volume of ammonia is required to completely reduce 120 g of Copper oxide? ( Cu=64, O=16, N=14)
Volume of Ammonia(NH₃) = 22.4 L
Further explanationGiven
Reaction
3CuO+2NH₃⇒ 3Cu + 3H₂O+ N₂
In the problem, the CuO coefficient should be 3 not 2
M CuO = 80
mass CuO = 120 g
Required
The volume of NH₃
Solution
mol CuO :
[tex]\tt mol=\dfrac{mass}{M}\\\\mol=\frac{120}{80}\\\\mol=1.5[/tex]
From the equation, mol ratio CuO : NH₃ = 3 : 2, so mol NH₃=
[tex]\tt \dfrac{2}{3}\times 1.5=1~mol[/tex]
Assume at STP(0 °C, 1 atm) ⇒1 mol = 22.4 L, then volume of NH₃=22.4 L
Where are chlorofluorocarbons (CFCs) found? Why were they banned?
Answer:
A gaping hole in the ozone layer over Antarctica was discovered in the mid 1980s. The international community agreed the Montreal Protocol in 1987, which banned most of the offending chemicals.
Hope this helps..In any chemical process, the matter is neither lost nor gained. *
reaction
conservation of matter
covalent bonds
physical change
In any chemical process, the matter is neither lost nor gained according to conservation of matter. Therefore, the correct option is option B.
What is matter?Matter is any material that has weight and occupies space by having volume in classical physics as well as general chemistry. All common items that can be felt are ultimately constituted of atoms, which are composed of colliding subatomic particles, therefore "matter" typically comprises atoms and everything made up of them, as well as any particles that act as if they both rest weight and volume.
It does not, however, contain massless particles like photons or even other energy phenomena and waves like light or heat. There are numerous states of matter (also known as phases). In any chemical process, the matter is neither lost nor gained according to conservation of matter.
Therefore, the correct option is option B.
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96.5 grams of gold has a volume of 5 cm, what is the density of gold?
Answer:
9.3
Explanation:
The first thing to do to solving this problem is putting mass over volume, 96.5g / 5cm^3. When you divide, you should get 1. Hope I helped.
Ratan started business with cash Rs 50000
Answer:
what's the question here then ?????
Explanation:
nepal ????
A chipmunk (mass of approximately 1 kg) does push-ups by using a force of 5 N to elevate its center-of-mass by 6 cm in order to do 0.70 Joule of work. If the chipmunk does all this work in 2 seconds, what is its power?
Answer:
Approximately [tex]0.35\; \rm W[/tex] on average.
Explanation:
There are multiple to find power:
Power [tex]P[/tex] is equal to the product of force [tex]F[/tex] and the speed [tex]v[/tex] at which that force moves the object. That is: [tex]P = F \cdot v[/tex].On the other hand, average power [tex]P[/tex] is also equal to the rate at which work [tex]W[/tex] is done. In other words, average power [tex]P\![/tex] is the average work done in unit time. If work [tex]W\![/tex] is done in time [tex]t[/tex], the average power would be [tex]P = W / t[/tex].The question did not state the speed at which the arm of the chipmunk moves. However, the question did state the work done ([tex]W = 0.70\; \rm J[/tex]) and the time required ([tex]t = 2\; \rm s[/tex]).
Therefore, the equation [tex]P = W / t[/tex] seem to be more suitable.
[tex]\begin{aligned}&P\\ &= \frac{W}{t} \\ &= \frac{0.70\; \rm J}{2\; \rm s} \approx 0.35\; \rm W\end{aligned}[/tex].
Cooks sometimes marinate meat in liquid before cooking, which helps soften the meat and adds flavor. A cook places a whole
steak and 16 oz. of marinating liquid in a bowl, and then marinates the mixture overnight in the refrigerator. Many changes would
* speed up this rate of marination. Which of these would slow it down?
Answer:D
Explanation:
Answer:
C) adding 16 oz. of water to the marinating liquid
Explanation:
Adding 16 oz. water to the marinating liquid would decrease the concentration of the marinating liquid and slow down the rate of reaction. The other answer choices would increase the rate of reaction.
If 4.2 g of water is actually produced, what is the percent yield?
Answer:
23.33%
Explanation:
from
percent yield=(mass÷total mass )×100%
Which two options are examples of chemical changes? A. A white powder mixed with a clear, colorless liquid makes a solution that is also a clear, colorless liquid. B. When two clear, colorless liquids are mixed together, a white solid forms. O C. A shiny metal bar glows red and expands when heated. D. A white piece of paper turns black and gives off a smell when burned.
Answer: B. When two clear, colorless liquids are mixed together, a white solid forms.
D. A white piece of paper turns black and gives off a smell when burned.
Explanation:
A. A white powder mixed with a clear, colorless liquid makes a solution that is also a clear, colorless liquid. B. When two clear, colorless liquids are mixed together, a white solid forms. O C. A shiny metal bar glows red and expands when heated. D. A white piece of paper turns black and gives off a smell when burned.
When two clear, colorless liquids are mixed together, a white solid forms. A white piece of paper turns black and gives off a smell when burned. These two options are examples of chemical changes.
What is chemical change ?Chemical change, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they are typically irreversible barring additional chemical reactions.
A chemical transformation is one in which one or more new compounds are created. Chemical reactions are another name for a chemical transformation. Examples include burning any stuff and iron rusting.
Chemical synthesis, or, alternatively, chemical breakdown into two or more separate molecules, occurs when one material reacts with another to create a new substance. These processes are referred to as chemical reactions, and they are typically irreversible barring additional chemical reactions.
Thus, option B and D are correct.
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SOMEONE HELP ME PLEASE ILL GIVE BRAINLY
Answer:
true
Explanation:
just did it
How many grams are in 2.5 moles of PO4?
How many moles of helium gas are present in 120 liters of STP
Ublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage. For those of us interested in the water cycle, sublimation is most often used to describe the process of snow and ice changing into water vapor in the air without first melting into water
Answer:
True
Explanation:
Sublimation is the conversion between the solid and the gaseous phases of matter, with no intermediate liquid stage.
For those of us interested in the water cycle, sublimation is most often used to describe the process of snow and ice changing into water vapor in the air without first melting into water which bypasses the conversion to liquid stage and goes straight to the gaseous form.
PLZ HELP ASAP THIS IS DUE LIKE RIGHT NOW
Answer:it's either the first or second one
Explanation:
the layers of the earth
Cylinder A and Cylinder B are sealed, rigid cylinders with movable pistons. Each cylinder contains 500. milliliters of a gas sample at 101.3 kPa and 298 K. Cylinder A contains H2 and cylinder B contains N2. Explain, in terms of collisions between gas molecules and the walls of the container, why pushing the movable piston farther into cylinder B at constant temperature would increase the pressure of the N2 gas.
Answer:
The pressure of N₂ gas in cylinder B when compressed at constant temperature increases due to the increase in the frequency of collision between the gas molecules with themselves and with the wall of their container caused by a decrease in volume of the container.
Explanation:
Gas helps to explain the behavior of gases when one or more of either temperature, volume or pressure is varying while the other variables are kept constant.
In the gas cylinder B, the temperature of the given mass of gas is kept constant, however, the volume is decreased by pushing the movable piston farther into the cylinder. According to the gas law by Robert Boyle, the volume of a given mass of gas is inversely proportional to its pressure at constant temperature. This increase in pressure is due to the increase in the frequency of collision between the gas molecules with themselves and with the wall of their container caused by a decrease in volume of the container. As the cylinder becomes smaller, the gas molecules which were spread out further become more packed closely together, therefore, their frequency of collision increases building up pressure in the process.
In terms of collisions between gas molecules and the walls of the container, the reason why pushing the movable piston farther into cylinder B at constant temperature would increase the pressure of the N2 gas is due to the fact that;
The movement of the piston farther into the cylinder would lead to an increase in the number of collisions per unit area between the N2(nitrogen) molecules and the internal walls of the cylinder. The movement described above would lead to creation of greater pressure because the more the collisions, the higher the pressure.The image showing the two cylinders are missing and so i have attached it.
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I need help with chemistry question?
Answer:
2Al + 3Na2SO4 -----> Al2(SO4)3 + 6 Na
Explanation:
Product should be Al2(SO4)3
Because Al contains +3 charge
And SO4 contains -2 charge
To balance this postive and negative charge we multiple +3 with 2 and -2 with 3
Define the term "Potential Energy" in your OWN WORDS.
hope this can help you
you can search on google some stuff like your question
i need help asap plzz first person to answer i will mark brainliest
Diagram 1
What type of air mass was already present A?
What type of air mass is coming in B ?
What type of front is indicated by the purple arrow?
What weather change is occurring because of this front?
Answer:
it's both cold and hot weather so it could form a tornado
Use the periodic table to identify the number of valence electrons available for bonding for each of the following elements.
Answer: Edgy, 2020
Explanation: <3
Answer:
refer to picture below :)
Explanation:
Apple juice can be classified as which of the following?
O A compound
An Element
O A mixture
O A pure substance
Answer:
mixture
Explanation:
Answer:
Mixture
Explanation:
NEEED HELP ASAP
Metals are ductileYou can pull or draw them into a wire. The ductility of a material is a / a *
A) chemical property
B) extensive property C)intensive property
D) reactive property
How many rings/energy levels would the Bohe model for an element
have if it had 12 electrons?
PLEASE HELP
which equation represents the process of cellular respiration?
Answer:
C 6 H 12 O 6 + 6 O 2 --> 6 CO 2 + 6 H 2 O + ATP is the complete balanced chemical formula for cellular respiration.
Answer:
C6H12O6 + 6O2 -> 6CO2 + 6H2O + 38ATP
Explanation:
glucose + oxygen gas -> carbon dioxide + water + ATP
How many moles of oxygen are in a sample of 29.1 moles of coal (C135H96O9NS)?
Answer:
2.19moles
Explanation:
mole = mass ÷ molar mass
Molar Mass of the compound, C135H96O9NS =
12(135) + 1(96) + 16(9) + 14 + 32
= 1620 + 96 + 144 + 14 + 32
= 1906g/mol
Next, we calculate the mass percent of Oxygen in the compound
O9 = 16(9) = 144g/mol
144/1906 × 100
= 0.0755 × 100
= 7.55%
This means that there are 0.0755g of Oxygen in 1 mole of the coal compound.
Hence, in 29.1 moles of coal, there would be 29.1 × 0.0755
= 2.19moles of Oxygen
What is the correct order of the scientific method?
Answer:
make an observationask questionsform a hypothesispredict your hypothesistest your hypothesis predictionmake new modifications to your hypothesis (repeat the steps)Explanation:
I hope this helps! :)))
1. A 50 gram sample of a radioisotope decays to 12.5 grams in 14.4 seconds. What is
the half-life of this isotope?
Answer:
Half life = 7.2 seconds
Explanation:
[tex]from \: decay \: equation \\ 2.303 log( \frac{n.}{nt} ) = kt \\ 2.303 log( \frac{50}{12.5} ) = k \times 14.4 \\ k = \frac{2.303 log( \frac{50}{12.5} )}{14.4} \\ k = 0.096288 {s}^{ - 1} \\ since \: half \: life = \frac{ ln(2) }{k} \\ half \: life = \frac{ ln(2) }{0.096288} \\ half \: life = 7.2 \: seconds[/tex]
what is the boiling point of a 0.321 m aqueous solution of NaCl. Enter your rounded answer with 3 decimal places.
Answer:
∆T = imK
∆T = Change in boiling point (B.P.)
i = van't Hoff factor = 2 for NaCl (Na+ and Cl2_
m = molality = 0.321 m
k = boiling point constant for water = 0.512 deg/m
∆T = (2)(0.321)(0.512) = 0.329 degrees
Since the normal B.P. for water is 100ºC, the new boiling point of this solution is 100 + 0.329 = 100.329ºC
So Our Answer is 100.329ºC
The boiling point of the 0.321 m NaCl solution has been 100.329 degrees Celsius.
The boiling point has been defined at the temperature at which the liquid started to convert to gas.
The van't Hoff factor has been a value of the number of ions formed by the dissociation of 1 formula unit of a compound.
The change in the boiling point of the sample, ([tex]\Delta T[/tex]) has been given by:
[tex]\Delta T=imK[/tex]
Where, the van't Hoff factor for NaCl, i =-2
The molality of the sample, m =0.321 m
The boiling point constant of water, [tex]K=0.512\;^\circ m^-^1[/tex]
Substituting the values for change in temperature ([tex]\Delta T[/tex]):
[tex]\Delta T=2\;\times\;0.321\;\times\;0.512\;^\circ C\\\Delta T=0.329\;^\circ C[/tex]
The change in the temperature of the water on the addition of NaCl has been 0.329 degrees Celsius.
The initial temperature of the water has been 100 degrees Celsius. The new temperature (T) of the NaCl solution has been:
[tex]T=100\;+\;0.329\;^\circ \text C\\T=100.329\;^\circ \text C\\[/tex]
The new boiling point of the NaCl solution has been 100.329 degrees Celsius.
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Can someone please help me with this???
Answer:
1)
Hg
80 protons, 80 electrons, 121 neutrons
2)
Mo
42 protons, 42 electrons, 54 neutrons
3)
Symbol is Cu, Mass is 64, 29 Protons
4)
C
Atomic number is 6, 6 protons, 6 electrons, 6 neutrons
5)
Symbol is P, 15 protons, 15 electrons, 16 neutrons
6)
Pb
Atomic number is 82, 82 electrons, 125 neutrons
7)
Na
Mass is 23, 11 protons, 11 electrons.
Hopefully this helps!
Convert each into decimal form. a) 1.056 x 10-3 b) 0.560 x 102
Answer:
A. 7.56
b. 57.12
Explanation:
Hope that's right have a nice day :)
manganese atom has 30 neutrons and atomic number 25
determine the electron cloud charge of manganese
Answer:
25
Explantion:
atomic no. = no. of eletron