Answer:
i dont get the equation sorry wish i can help
How many atoms are in 75.4 moles of Copper?
Answer:
No = Avagardro's number = 6.02 x 10^23
No.of atoms = no.of moles x No x atomicity
= 75.4 x 6.02 10^23 x 1
= 453.908 x 10^23 atoms .
#8- please help i suck at this, ill mark brainliest
Answer:
A. Synthesis
B. Combustion
C. Single-replacement
D. Decomposition
Explanation:
A: Synthesis. Two reactants are combined to form, or synthesize, one product.
B: Combustion. This is the general reaction for combustion. When something combusts, oxygen must be present. Carbon dioxide and water must also be produced.
C: Single-replacement. The oxygen from Fe₂O₃ is moved to K to form K₂O. Only one thing is being moved, or replaced.
D: Decomposition. You have one compound that breaks into, or decomposes, into two products.
A 32.149 mg sample of a chemical known to contain only carbon hydrogen sulfur and oxygen is put into a combustion analysis apparatus yielding 57.271 mg of co2 and 23.444 mg of h2o. In another experiment 22.345 mg of the compound is reacted with excess oxygen to produce 9.656 mg of sulfur dioxide
Answer:
C₅H₁₀SO₂
Explanation:
From the given information:
The objective is to identify the empirical formula of the compound.
To start with determining the mass of carbon from carbon dioxide; we have:
[tex]Mass \ of \ Carbon = \dfrac{molar \ mass \ of \ C }{molar \ mass \ of \ CO_2}\times mass \ of \ CO_2[/tex]
Mass of carbon = 12/44 × 57.271 mg
Mass of carbon = 0.2727 × 57.271 mg
Mass of carbon = 15.6178 mg
The mass of hydrogen is:
[tex]Mass \ of \ Hydrogen= \dfrac{molar \ mass \ of \ H }{molar \ mass \ of \ H_2O}\times mass \ of \ H_2O[/tex]
[tex]Mass \ of \ Hydrogen= \dfrac{2\times 1.008 }{18}\times 23.444 \ mg[/tex]
Mass of hydrogen = 2.6257 mg
The mass of sulphur is:
[tex]Mass \ of \ Sulphur = \dfrac{molar \ mass \ of \ S }{molar \ mass \ of \ SO_2}\times mass \ of \ SO_2[/tex]
Mass of Sulphur = [tex]\dfrac{32.07}{64.06} \times \dfrac{9.656}{1} \times \dfrac{32.149}{ 22.345}[/tex]
Mass of Sulphur = 6.9550 mg
The Mass of oxygen can now be = mass of (Sample - Carbon - Hydrogen - Sulphur)
= (32.149 - 15.6178 - 2.6257 - 6.9550)g
= 6.9505 g
Recall that:
number of moles = mass/molar mass
Thus:
The moles of C : H : S : O are:
[tex]= \dfrac{15.6178}{12} : \dfrac{2.6257}{1.008} : \dfrac{6.9550}{32.07} : \dfrac{6.9505}{16}[/tex]
= 1 : 2 : 0.2 : 0.4
Divide by the smallest; we have:
= 1/0.2 : 2/0.2 : 0.2/0.2 : 0.4/0.2
= 5 : 10 : 1 : 2
Thus, the empirical formula is = C₅H₁₀SO₂
How many atoms are there in 10.2 moles of Phosphorous?
There are 2.06 x 10²⁴ atoms
Further explanationThe mole is the number of particles (atoms, molecules, ions)contained in a substance
1 mol = 6.02.10²³ particles
Moles can also be determined from the amount of substance mass and its molar mass
number of atoms :
[tex]\tt 10.2\times 6.02\times 106{23}=2.06\times 10^{24}[/tex]
The diagrams below represent three phases of matter labeled A,B and C. Which table correctly identifies the phases of matter represented by the diagrams? *
Answer:
The correct answer is 1
Explanation:
From the above, we will note the following:
Diagram A is liquid because it takes the shape of its container and it also has a specific volume. The particles are not tightly packed.
Diagram B is gas because the particles are freely moving colliding with one another and with walls of the container.
Diagram C is solid because the particles are tightly packed and are not freely moving.
Therefore, Option 1 is the correct answer.
Answer: 1
Explanation: My professor said it was correct
A 1250.0g block of silver at 1oC is placed in 2.6g of water vapor at 102oC. What is the equilibrium temperature of the two substances? Specific Heat of Ag is 0.235J/goC
Please answer with work shown
Answer:
Explanation:
Let final temperature be T .
vapor is at 102⁰C
loss of heat by vapor in turning into water at 100⁰C
= 2.6 x 2 x 1.996 + 2.6 x 2260 = 5886.37 J
loss of heat to lower temperature to T
2.6 x 4.186 x ( 100 - T )
1088.36 - 10.88 T
Total heat loss = 5886.37 + 1088.36 - 10.88 T
= 6974.73 - 10.88 T
heat gain by silver to gain temperature from 1⁰C to T⁰C
= 1250 x ( T - 1 ) x .235 = 293.75 T - 293.75
heat gain = heat loss
293.75 T - 293.75 = 6974.73 - 10.88 T
304.63 T = 7268.48
T = 23.86°C .
Question 3 (1 point)
Which of the following best explains the scenario below?
On a summer morning, Mrs. Houser walks barefoot across her paved driveway with
no problem. However, later that afternoon she steps barefoot onto the same
driveway and must quickly run off because the bottoms of her feet feel like they are
burning. (Lesson 3.02-3.04 Thermal Energy)
Choose the best explanation for this scenario:
As the temperature increased
during the day, the particles in the pavement
moved slower and the thermal energy decreased.
As the temperature increased during the day, the particles in the pavement
moved faster and the thermal energy decreased.
As the temperature increased during the day, the particles in the pavement
moved faster and the thermal energy increased.
As the temperature increased during the day, the particles in the pavement
moved slower and the thermal energy increased.
Pls help ASAP
Answer:
C. As the temperature increased during the day, the particles in the pavement moved faster and the thermal energy increased.
Explanation:
During the day, the temperature increases and the average kinetic energy of its particles increases. With the increase in kinetic energy, particles start vibrating faster that occupies more space. This increased molecular motion results in the generation of more thermal energy.
Therefore, the thermal energy of an object increases as its temperature increases.
Hence, the correct answer is "C."
Answer: Hello. the correct answer is Option C. As the temperature increased during the day, the particles in the pavement moved faster and the thermal energy increased.
Explanation:
I Took the K12 Online School Quiz.
Which statement best describes insoluble substances? Insoluble substances remain the same when in water. Insoluble substances become part of the liquid substance. Water does not remain when an insoluble substance is added. Insoluble substances change from solid to liquid states.
Answer:
Insoluble substances remain the same when in water.
Explanation:
When a substance is regarded as insoluble, it means that the substance remains the same in water.
Soluble substances usually form one continuous phase with water when they are added to water (eg when salt is added to water).
However, when camphor is added to water, it does not form a single phase with water. It remains the same in the water and maintains a separate phase from the water. Hence camphor is an insoluble substance.
please need asap
An atom with 38 protons and 49 neutrons would be
Strontium-49
Francium-49
Strontium-87
Francium-87
Answer:
i think it is francium 87 if i fail then i am sorry
Which of the following atoms has the greatest ionization energy?
a.)W
b.)C
C.)d
P.)d
Answer:
helium
Explanation:
because there are no electrons screening it from the nucleus
I will give brainliest !
Which of the following is NOT an example of how biotic factors interact with abiotic factors in an ecosystem?
A) Plants remove carbon dioxide from the air and add oxygen.
B) Animals cause erosion by digging in the dirt.
C) A lion preys on a herd of gazelle.
D) A lizard raises its body temperature by using heat from the Sun.
Answer:
C
Explanation:
I had the same answer during school and the teacher said it was correct but if it isnt I'm super sorry
A lion preying on a herd of gazelle is not an example of how biotic factors interact with abiotic factors in an ecosystem.
What is an ecosystem?
Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
Learn more about ecosystem,here:
https://brainly.com/question/1673533
#SPJ6
⚠️NEED HELP ASAP⚠️What is the oxidation number of nitrogen in (NO3)2
A) +3
B) +1
C+5
D) -5
Explanation:
its +5 trust me on this hope this helps kiddo
HELP ASAP
solubility lab
can you please do a scatterplot graph with this information
graph a scatterplot using x = temperature ( in degree Celsius and y=sugar dissolved (in grams). Each row will give one point for the graph. Analyza and interpret the scatterplot.
Answer:
the bottom part please
Explanation:
Sunidhi made a study chart about changes in states of matter. Which headings best complete the chart? X: Solid Directly to Liquid Y: Liquid Directly to Solid X: Liquid Directly to Solid Y: Solid Directly to Liquid X: Heat Is Released Y: Heat Is Absorbed X: Heat Is Absorbed Y: Heat Is Released
Answer:
The answer is "freezing and melting sublimating x y".
Explanation:
In the given question, the given table name is used as the matter condition, which is freezing or melting sublimation x y, that must be the best headings throughout order to cancel a column of state of matter.
The process goes from the solid-state to a gaseous state, that is achieved by bringing heat into another system.
Answer:
D eng2020
Explanation:
X:heat is absorbed
y: heat is released
Analyzing a blood sample usually involves which type of separation method?
screening
distillation
centrifugation
filtration
Answer:
the answer is b
Explanation:
i just did quizz
If the density of the mantle rock is about 3.3 g/cm3, then what is its specific gravity?
2.6
2.8
3.3
3.0
Answer:
2.6
Explanation:
Answer: That is wrong!!! The correct answer is C, 3.3
Explanation:
Which example illustrates a chemical change
shredding paper
smashing a soda can
burning wood
chopping wood
whose electronic configuration is likely to be acquired by aluminium by chemical reaction
Answer:
Explanation:
The configuration notation provides an easy way for scientists to write and communicate how electrons are arranged around the nucleus of an atom. This makes it easier to understand and predict how atoms will interact to form chemical bonds
When copper is bombarded with high-energy electrons, X rays are emitted. Calculate the energy (in joules) associated with the photons if the wavelength of the X rays is 0.154 nm.
Answer:
E = 12.92 × 10^(-16) J
Explanation:
Formula for energy is;
E = hc/λ
Where;
h is Planck's constant = 6.63 x 10^(-34) J.s
c is speed of light = 3 × 10^(8) m/s
λ is wavelength = 0.154 nm = 0.154 × 10^(-9) m
E = (6.63 x 10^(-34) × 3 × 10^(8))/(0.154 × 10^(-9))
E = 12.92 × 10^(-16) J
The energy associated with the photons of X rays with a wavelength of 0.154 nm is 1.29 × 10⁻¹⁵ J.
When copper is bombarded with high-energy electrons, X rays, with a wavelength of 0.154 nm (λ) are emitted.
We can calculate the energy (E) associated with the photons of these X rays using the Planck-Einstein relation.
[tex]E = \frac{h \times c }{\lambda } = \frac{(6.63 \times 10^{-34}J.s ) \times (3.00 \times 10^{8}m/s ) }{0.154 \times 10^{-9} m } ]= 1.29 \times 10^{-15} J[/tex]
where,
h: Planck's constantc: speed of lightThe energy associated with the photons of X rays with a wavelength of 0.154 nm is 1.29 × 10⁻¹⁵ J.
Learn more: https://brainly.com/question/2058557
What is the volume of a weather balloon that has 39 grams of helium with a density 0.017 g/mL?
Answer:
The answer is 235.29 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question.
density = 0.017 g/mL
mass = 4 g
We have
[tex]volume = \frac{4}{0.017} \\ = 235.2941176...[/tex]
We have the final answer as
235.29 mLHope this helps you
7th GRADE SCIENCE FIRDT PERSON MARKED BRAINLIEST
A generator is used to convert ________ energy into ______ energy
Answer:
An electricity generator is a device that converts a form of energy into electricity.
Answer:
mechanical to electrical
Explanation:
please help if you can. thank you.
Answer:
[tex]a. BaF_{2} \\b. SnCl_{4}\\ c.Cr_{2} O_{3} \\d. FeO\\e. Li_{3} P[/tex]
Explanation:
Hey, just for a quick tip..you can use a cross to determine which ion will have how many atoms. check the image attached.
Burning 1 kg of coal releases about 3 million joules of energy. If you could use all of the chemical energy to lift another kilogram of coal, how high could you lift it?
I could lift 3.06 x 10⁵ m high
Further explanationEnergy is the ability to do work. Energy can change from one energy to another
Potential energy is the energy that an object has because of its position
The potential energy can be formulated:
Ep = m. g. h
E = potential energy of an object, joule
m = object mass, kg
g = gravity acceleration, m / s²
h = height of an object, m
energy of coal = 3.10⁶ J
mass = 1 kg
g = 9.8 m/s²
[tex]\tt h=\dfrac{E}{m.g}\\\\h=\dfrac{3.10^6}{1\times 9.8}=3.06\times 10^5`m[/tex]
Write down the answer. Make sure to use the correct number of sig figs or
spots after the decimal. 987.22 - 377.1*
Answer:
610.1
Explanation:
When we add or subtract the values, the number of significant figures after decimal in result must be equal to the given measurement having less number of decimal places.
In given values 377.1 has only decimal place thus in result after decimal there should be one digit only.
987.22 - 377.1 = 610.1
When we multiply or divide the values the number of significant figures must be equal to the less number of significant figures in given value.
Now we will calculate the difference between 7.69 and 4.0.
7.69 - 4.0 = 3.69
In given values 4.0 have less number of significant figures thus result must have only two significant figures . So we would round the result.
3.7
please helppp this is about to be due
Answer:
38
Explanation:
An atom consist of electron, protons and neutrons. Protons and neutrons are present with in nucleus while the electrons are present out side the nucleus.
All these three subatomic particles construct an atom. A neutral atom have equal number of proton and electron. In other words we can say that negative and positive charges are equal in magnitude and cancel the each other. For example if neutral atom has 6 protons than it must have 6 electrons. The sum of neutrons and protons is the mass number of an atom while the number of protons are number of electrons is the atomic number of an atom.
In given question atomic number is 38 which means number of proton and number of electrons are also 38 because number of protons are electrons are always equal in neutral atom.
Which is NOT part of the definition of matter
Answer:
Everything that has mass and takes up space is matter. Every day, you find something usual that either does't have mass or else don't take up space. Those things are non-matter. Basically, any type of energy or any abstract concept is an example of something that does not have matter.
Explanation:
What is the product of Na +CaSO4,
Answer:
Na + CaSO4 = Na2SO4 + Ca
Explanation:
single displacement (substitution)
Consider the reaction below. 2 Upper N Upper H Subscript 3 (g) Baseline double headed arrow Upper N Subscript 2 (g) Baseline + 3 Upper H Subscript 2 (g). What is the most likely effect to the forward reaction if there is an increase in pressure on this reaction? The reactant surface area increases. The reaction rate decreases. The reaction is not affected at all. The reaction stops completely.
Answer:
The increase in pressure of the reacting system will increase the formation of NH₃
Explanation:
The given parameters are;
2NH₃ (g) ⇄ N₂ (g) + 3H₂ (g)
The number of molecules in the reactant side of the equation = 2 molecules
The number of molecules in the product side of the equation = 1 + 3 = 4 molecules
Avogadro's law states that equal volume of all gases at a given temperature and pressure contains equal number of molecules
Therefore, given that the number of molecules of the product are twice the number of molecules of the reactant, the volume of the product is twice the volume of the reactant
If the pressure is increased, at constant temperature by Boyles law, the volume will be reduced, favoring the formation of the low volume occupying NH₃
Therefore, the reverse reaction (formation of NH₃) will preferably occur.
Answer:
The answer is B
Explanation:
The other answer is incorrect. The correct Answer is B
Trust Me
a.
A una atmósfera de presión (1atm), ¿cuál es el punto de solidificación del agua?
Answer:
ajansnnddndjsjjenrndndndndndndndnd
how can you find a tutor??
Depending on what you are doing, virtual, or in school, you can contact your school and you ask them, or you can have your teacher, based on the subject, tutor you.
<3
Answer:
You can find tutors in many ways maybe you can find some apps or
you can also ask any family members who live close and ask them there is many ways :)
It sometimes depends on the subject
Can I have brainliest pleasee