Answer:
Density often has units of grams per cubic centimeter (g/cm3). Remember, grams is a mass and cubic centimeters is a volume (the same ... and minerals since the density of substances rarely changes significantly. For example, gold will always have a density of 19.3 g/cm3; if a mineral has a density
Explanation:
For example, a 1-litre soda bottle filled with air would feel much lighter than the same ... If 500 mL of a liquid has a density of 1.11 g/mL, what is its mass? ... The density of water at 4oC can be written as 1.000g/cm3 , 1.000g/mL ... In order to determine the density of a substance, you need to know its mass and its volume.
If a substance has a density of 2.5 grams/centimeters³ then the mass of the substance having a volume of 50 centimeters³ would be 75 grams.
What is density?It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.
As given in the problem If a substance has a density of 2.5 grams/centimeters³ then we have to find out the mass of the substance which has a volume of 50 centimeters³
the density of the substance = mass of the substance /volume of the substance
2.5 grams/centimeters³ = mass of the substance/50 centimeters³
mass of the substance = 2.5 ×50
= 75 grams
Thus, the mass of the substance would be 75 grams.
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3. Explain the gravitational force earth has with one other object in the solar
system.
I
Answer: It's gravity keeps the Moon orbiting around the Earth.
Explanation:
Which is one way that minerals crystallize from materials dissolved in water?
from the air
from solutions that evaporate
from hot water solutions when water boils
from the soil
Answer:
the second answer its science behind it
Answer:
b
Explanation:
Which statement best describes how to read a reaction pathway graph for an endothermic reaction?
A) Reactants absorb a minimum amount of energy and then release a larger amount of energy as products form.
B) Reactants release a minimum amount of energy and then absorb a larger amount of energy as products form.
C) Reactants absorb a minimum amount of energy and then release a smaller amount of energy as products form.
D) Reactants release a minimum amount of energy and then absorb a smaller amount of energy as products form.
Answer:
C) Reactants absorb a minimum amount of energy and then release a smaller
amount of energy as products form.
Explanation:
The statement that best describes how to read a reaction pathway from the graph of an endothermic reaction is that, reactants absorb a minimum amount of energy and then release a smaller amount of energy as products form.
In an endothermic change, heat is absorbed from the surrounding.
As such, the surrounding becomes colder at the end of the reaction. On a graph of an endothermic reaction, the reactants absorbs a minimum energy. As the reaction proceeds, the products gives off an even lesser amount of energy.My made-up polyatomic ion goldate acts a lot like chlorate (it has the same charge and the same number of oxygens). What would the name be for the acid, HG004(aq)?
a. Hydrogen diogoldate
b. Goldous acid
c. Goldic acid
d. Pergoldic acid
e. None of these
Answer:
d. Pergoldic acid
Explanation:
chlorate = ClO₃⁻
Goldate GoO₃⁻
On this basis we can infer that HClO₄ and HGoO₄ will be similar .
HClO₄ is called perchloric acid , hence HGoO₄ will be called pergoldic acid.
Which of the following reactions would you expect to produce the most energy?
A. Nuclear fusion of two hydrogen isotopes.
B. Combustion of hydrogen gas.
C. Combination of a strong acid and a strong base.
D. Burning a large hydrocarbon, such as oil.
Answer:
A
Explanation:
Nuclear fusion is a much more powerful reaction than any of the others.
Nuclear fusion of two hydrogen isotopes would expect to produce the most energy. Therefore, option (A) is correct.
What is nuclear fusion?Nuclear fusion can be defined as when two or more nuclei fuse together to form a single heavier nucleus. In this reaction, the matter is generally not conserved due to some of the mass of the nuclei being converted to energy.
For nuclear fusion, the nuclei must be brought closer to the reaction occurring. Each star in the universe, including sun, is shining due to nuclear fusion reactions. They produce large amounts of energy in this process.
In the Sun's core, hydrogen nuclei are get transformed into helium nuclei which are known as nuclear fusion. It takes place when four hydrogen nuclei fuse into each helium nucleus. During the Nuclear fusion process, some of the mass of hydrogen nuclei is transformed into energy.
Therefore, nuclear fusion is where hydrogen atoms combined to form helium to produce the most energy.
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Which is the best surface for absorbing heat radiation? ☆ Shiny white Shiny black Dull black Dull white
Dull black surface are good absorbers of radiation.
Thermal radiationThe process by which energy in the form of electromagnetic radiation is emitted by a heated surface and travels directly to its absorption point at the speed of light.
The rate at which a body absorbs or radiates thermal radiation relies upon the nature of the surface as well.
According to the Kirchhoff's radiation law, the objects, which are good emitters are also good absorbers.
A blackened surface is an excellent absorber as well as an excellent emitter.
A black body refers to a body, which is regarded as a perfect radiator and absorber of electromagnetic radiations, a dull black surface is a good absorber of heat radiation.
Thus, dull black surface is the best surface for absorbing heat radiation.
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Happy halloween. Gg's bois we made it through the week.
Answer:
yah it was one of my best I've ever had
Entropy is a measure of
1.
accuracy
2.
precision
3.
the disorder of a system
4.
the attraction of a nucleus for an electron
Answer:
The answer is actually 3. The disorder of a system.
The rock has a mass of 7.9g and a volume of 3.0 cm3. What is the density of the rock?
Answer:
The answer is 2.63 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\ [/tex]
From the question we have
[tex]density = \frac{7.9}{3} \\ = 2.633333...[/tex]
We have the final answer as
2.63 g/cm³Hope this helps you
If 550 grams of KClO3 breaks down and produces 175 grams of KCl, how many grams of O2 are produced?
Answer:
215.51 g of O2.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2KClO3 —> 2KCl + 3O2
Next, we shall determine the mass of KClO3 that decomposed and the mass of O2 produced from the balanced equation. This is illustrated below:
Molar mass of KClO3 = 39 + 35.5 + (16×3)
= 39 + 35.5 + 48
= 122.5 g/mol
Mass of KClO3 from the balanced equation = 2 × 122.5 = 245 g
Molar mass of O2 = 16 × 2 = 32 g/mol
Mass of O2 from the balanced equation = 3 × 32 = 96 g
From the balanced equation above,
245 g of KClO3 decomposed to produce 96 g of O2.
Finally, we shall determine the mass of O2 produced by the decomposition of 550 g of KClO3. This can be obtained as follow:
From the balanced equation above,
245 g of KClO3 decomposed to produce 96 g of O2.
Therefore, 550 g of KClO3 will decompose to produce =
(550 × 96)/245 = 215.51 g of O2.
Therefore, 215.51 g of O2 were obtained from the reaction.
Writing key words in the margin is part of which note-taking procedure?
Select one:
a. record
b. review
c. reduce
d. recite
12. In the modern periodic table, which of the following describes the elements with similar
properties?
A. They have similar atomic masses.
B. They are located in the same group.
C. They are located in the same period.
D. They have the same number of protons.
Peroxyacylnitrate (PAN) is one of the components
of smog. It is a compound of C, H, N, and O.
Determine the percent composition of oxygen and
the empirical formula from the following percent
composition by mass: 19.8 percent C,
2.50 percent
H, 11.6 percent N. What is its molecular formula
given that its molar mass is about 120 g?
C – 19,9%, H – 2,2%, N – 11,6%, O – x%
[tex]M=120\frac{g}{mol}[/tex]
1 percentage
The entire molecule is 100% and all the components of the compound add up to 100%.
100% - 19,9% - 2,5% - 11,6% = 66,1%
The compound contains 66,1% oxygen.
2 molar masses
[tex]M_{C}=12,01\frac{g}{mol}[/tex]
[tex]M_{H}=1,008\frac{g}{mol}[/tex]
[tex]M_{O}=15,999\frac{g}{mol}[/tex]
[tex]M_{N}=14,007\frac{g}{mol}[/tex]
3 masses
The compound has a molar mass of 120g/mol. So one molecule weighs 120 g. To find out how much the percentage of a component weighs, you have to calculate it using the molar mass.
carbon
19,8% of 120g
[tex]m=120g*0,198\\m=23,76g[/tex]
One molecule contains 23,76g of carbon.
hydrogen
2,5% of 120g
[tex]m=120g*0,025\\m=3g[/tex]
One molecule contains 3g of hydrogen.
oxygen
66,1% of 120g
[tex]m=120g*0,661\\m=79,32g[/tex]
One molecule contains 79,32g of oxygen.
nitrogen
11,6% of 120g
[tex]m=120g*0,0,116\\m=13,92g[/tex]
One molecule contains 13,92g of nitrogen.
4 amount of substance
carbon
[tex]n=\frac{23,76g}{12,01\frac{g}{mol} }\\n=1,98mol[/tex]
The compound contains about 2 moles of carbon.
hydrogen
[tex]n=\frac{3g}{1\frac{g}{mol} }\\n=3mol[/tex]
The compound contains about 3 moles of hydrogen.
oxygen
[tex]n=\frac{79,32g}{15,999\frac{g}{mol} }\\n=4,96mol[/tex]
The compound contains about 5 moles of oxygen.
nitrogen
[tex]n=\frac{13,92g}{14,007\frac{g}{mol} }\\n=0,99mol[/tex]
The compound contains about 1 moles of nitrogen.
5. molecular formula
The formula results from the ratio of the amounts of substance.
[tex]n_{C} :n_{H} :n_{O} :n_{N} =2:3:5:1\\C_{2}H_{3}NO_{5}[/tex]
The molecular formula of the given compound is C₂H₃NO₅, and percent composition of oxygen in it is 66.1%.
How do we calculate mass from % composition?Mass of any composition of any compound will be calculated by using the below formula as:
Mass of component = (% composition)×(mass of compound) / 100
Given mass of compound = 120g/mol
Total composition of compound (100%) = Percent composition of all components
% composition of oxygen = 100 - (19.8 + 2.50 + 11.6) = 66.1%
Moles will be calculated as:
n = W/M, where
W = given mass
M = molar mass
For carbon atom:Mass of Carbon component = (0.198)(120g) = 23.76g
Moles of Carbon atom = 23.76g / 12.01g/mol = 1.98mol = 2 moles
For nitrogen atom:Mass of Nitrogen component = (0.116)(120g) = 13.92g
Moles of Nitrogen atom = 13.92g / 14.007g/mol = 0.99mol = 1 moles
For oxygen atom:Mass of Oxygen component = (0.661)(120g) = 79.32g
Moles of Oxygen atom = 79.32g / 15.99g/mol = 4.96mol = 5 moles
For hydrogen atom:Mass of Hydrogen component = (0.025)(120g) = 3g
Moles of Hydrogen atom = 3g / 1g/mol = 3 moles
So, the molecular formula of the compound on the basis of moles of given entities is C₂H₃NO₅.
Hence required molecular formula is C₂H₃NO₅.
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Rupert had three substances. A brown substance was a liquid at room
temperature. He hit each of the other two with a hammer. A blue crystal
cracked but did not break. A silver substance flattened but did not crack.
Which two statements could be true?
A. The brown substance is ionic
B. The silver substance is ionic
C. The brown substance is molecular
D. The blue substance is ionic
Answer:
its C and D
C. The brown substance is molecular
D. The blue substance is ionic
Explanation:
did the test !
Two correct statements are B) The silver substance is ionic
C) The brown substance is molecular.
What kind of substance is silver?Silver is a chemical element with the symbol Ag and atomic wide variety 47. categorized as transition steel, Silver is stable at room temperature.
Which substance is molecular?It is a molecular substance, that's a substance with or more atoms, the smallest gadgets of remember joined together via a covalent bond. A covalent bond is a hyperlink created via the sharing of electrons that holds these atoms collectively.
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The reverse of the process of sublimation is called
Answer:
Desublimation
Explanation:
The reverse of deposition is sublimation and hence sometimes deposition is called desublimation.
HOPE THIS HELPS
When methylcyclobutane is treated with chlorine gas and heated, the total number of monochlorinated products, including stereoisomers, is
Answer:
5
Explanation:
The image attached shows the different monochlorination products obtained when chlorine gas is heated with methylcyclobutane.
We must keep in mind that the reaction occurs by free radical mechanism as shown in the image attached. The proportion in which the products are formed depends on the stability of the free radical intermediate leading to that particular product.
Image credit: askiitians
Help, 8th grade Science
Which statement best compares the amount of fossil fuels formed each year to the amount used each year?
Answer: The amount of fossil fuels formed is approximately the same as the amount used.
Explanation:
The amount of fossil fuels formed is approximately the same as the amount used. The amount of fossil fuels formed is much less than the amount used. The amount of fossil fuels formed is greater than the amount used.
The amount of fossil fuels formed is much less than the amount used. The correct option is C.
What is fossil fuel?Fossil fuels are deduced from the putrefaction of both animals and plants. These fuels, which can be discovered in the Earth's crust as well as encapsulate carbon and hydrogen, can be burned for energy.
Fossil fuels include coal, oil, and natural gas. The amount of fossil fuels produced is significantly less than the amount consumed.
The compounds that comprised up plankton as well as plants transform into fossil fuels after millions of years underground. Plants decompose into coal while plankton decomposes into natural gas and oil.
These resources are now extracted by humans through coal mining and the drilling of oil and gas wells on land and offshore.
Warming would certainly slow if we stopped using fossil fuels today, but removing greenhouse gases from the atmosphere will have to happen eventually.
Thus, the correct option is C.
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Your question seems incomplete, the missing options are:
The amount of fossil fuels formed is exactly the same as the amount used.
The amount of fossil fuels formed is approximately the same as the amount used.
The amount of fossil fuels formed is much less than the amount used.
The amount of fossil fuels formed is greater than the amount used.
Copying is not allowed. You must show all work in order to receive credit. Naturally occurring silver has two isotopes. Isotope A has a relative mass of 106.9051 and an abundance of 51.82%. Isotope B has a relative mass of 108.9047. Calculate the atomic mass of silver from these data.
Answer: The atomic mass of silver is 107.8
Explanation:
Average atomic mass is the average mass of all the isotopes present depending on the relative abundance of each isotope.
Mass of isotope A = 106.9051
% abundance of isotope 1 = 51.82% = [tex]\frac{51.82}{100}[/tex]
Mass of isotope B = 108.9047
% abundance of isotope 2 = (100-51.82)% = [tex]\frac{48.18}{100}[/tex]
Formula used for average atomic mass of an element :
[tex]A=\sum[(106.9051)\times \frac{51.82}{100})+(108.9047)\times \frac{48.18}{100}]][/tex]
[tex]A=107.8[/tex]
Therefore, the average atomic mass of silver is 107.8
A rock dropped in a graduated cylinder raises the level of water from 20 mL to 35 mL. The rock has a mass of 45 g. What is the density of the rock?
Rocks that undergo weathering and emulsification result in which type of rock?
Igneous
Metamorphic
Sedimentary
Answer:
1st one
Explanation:
Using Gizmo ,describe the main use for each fuel Coal: Petroleum: In each case, what is the end product of burning the fossil fuel,and where does it go? Help is for today
Answer:
See explanation
Explanation:
Coal is primarily used for electricity generation. The burning of coal leads to emission of gases such as oxides of carbon, oxides of sulphur, oxides of nitrogen and water vapour. All these go straight into the atmosphere.
Petroleum is primarily used as transportation fuels. The burning of petroleum oils mostly leads to the emission of oxides of carbon and sulphur together with water vapour into the atmosphere.
Suppose a flask is filled with of , of and of . The following reaction becomes possible: The equilibrium constant for this reaction is at the temperature of the flask. Calculate the equilibrium molarity of H2O. Round your answer to two decimal places.
Answer:
1.02M
Explanation:
The first thing to do is to write out the balanced chemical reaction out.
Therefore, the chemical equation for the chemical reaction is given below as:
CO + H₂O <------------------------------------------------------------------------------> CO₂ + H₂.
The molarity of CO = 1.8/O.25 = 7.2M, the molarity of H2O = 0.5 × 4 = 2 m and the molarity of CO2 is 1.6 × 4 =6.4 M.
Therefore at equilibrium we have that the molarity of CO = (7.2 - x)M, the molarity of CO2 at equilibrium = (6.4 + x)M, the molarity of Hydrogen at equilibrium = x M and the molarity of H2O at equilibrium = ( 2 - x) M.
Hence, the equilibrium constant is given as, Kc = 0.152 = [CO2][H2]/[CO][H2O].
The equilibrium constant = 0.152 = [6.4 + x][x]/[7.2 - x][2 - x].
Solving for the quadratic equation gives the value of x as equals to= 0.981.
Therefore, the equilibrium molarity of H2O = 2 - 0.981 = 1.019 = 1.02M
Josh heated a certain amount of blue copper sulfate crystals to get 2.1 g of white copper sulfate powder and 1.4 g of water. What is most likely the mass of the blue copper sulfate that he heated and why?
Answer: The mass of blue copper sulfate is 3.5 g
Explanation:
Law of conservation of mass states that mass can neither be created nor be destroyed but it can only be transformed from one form to another form.
This also means that total mass on the reactant side must be equal to the total mass on the product side.
The chemical equation for the heating of copper sulfate crystals is:
Let the mass of blue copper sulfate be 'x' grams
We are given:
Mass of copper sulfate powder = 2.1 grams
Mass of water = 1.4 grams
Total mass on reactant side = x
Total mass on product side = (2.1 + 1.4) g
So, by applying law of conservation of mass, we get:
Hence, the mass of blue copper sulfate is 3.5 grams
which angles are right
Answer:
a right is 90 degrees
Both olives and the leaves of olive trees contain alkanes with long carbon chains. A predominant alkane in olives has 27 carbons, whereas a major alkane component in olive leaves has 31 carbons. What is the molecular formula of each of these alkanes?
Answer:
Explanation:
Alkanes are saturated hydrocarbons (i.e they do not have any double/triple bond within there carbon chain). They have the general formula CₙH₂ₙ₊₂ where n is the number of carbons and starts with 1.
Since the predominant alkane in the olive has 27 carbons, it's molecular formula will be C₂₇H₍₂ₓ₂₇₎₊₂ ⇒ C₂₇H₅₆
The major alkane component in the olive leaves has 31 carbons, hence it's molecular formula will be C₃₁H₍₃₁ₓ₂₎₊₂ ⇒ C₃₁H₆₄
Which of the following objects would have the smallest wavelength at the same velocity?
Baseball
Electron
Planet Earth
Proton
Answer: Planet Earth
Explanation: Wavelength (λ) is equal to h/mυ , where m = the mass of your object and υ = the frequency. Since Earth has the largest mass of the options, we can conclude that Earth will have the smallest wavelengths out of the rest.
The wavelength of matter-waves is given by the De Broglie formula. The larger the object, the smaller the observed wavelength hence the object having the smallest wavelength is Planet Earth.
De Broglie established the relationship between the momentum and the observed wavelength of an object. This proposition came to be known as wave-particle duality.
The wavelength of matter waves is given by;
λ = h/mv
Where;
λ = wavelength
m = mass of object
v = velocity of the object
If all the objects have the same velocity, the magnitude of the wavelength now depends on the mass of the object.
The object having the largest mass among the options is planet earth (5.972 × 10^24 kg).
Hence planet earth has the smallest wavelength among the options listed.
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Calcium's valence shell holds two electrons. Chlorine's valence shell holds seven electrons. Which represents the ions that are bonded in
calcium chloride?
A. Ca^2+ + 2Cl-
B. Ca^2- + 2CI+
C. 2Ca+ + 2C1-
D. Ca\/2+ + Cl\/2-
What type of energy is the sun of an objects potential and kinetic energy
All of the energy from the Sun that reaches the Earth arrives as solar radiation, part of a large collection of energy called the electromagnetic radiation spectrum. Solar radiation includes visible light, ultraviolet light, infrared, radio waves, X-rays, and gamma rays. Radiation is one way to transfer heat.
Calculate the volume in ml of a 0.555 M NaHCO3 solution that contains 14.7 g of NaHCO3. ______ ml
Answer:
315 mL
General Formulas and Concepts:
[tex]Molarity=\frac{moles \hspace{3} of \hspace{3} solute}{liters \hspace{3} of \hspace{3} solution}[/tex]
Explanation:
Step 1: Define variables
0.555 M NaHCO₃
14.7 g NaHCO₃
Step 2: Define conversions
Molar Mass of Na - 22.99 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of C - 12.01 g/mol
Molar Mass of O - 16.00 g/mol
Molar Mass of NaHCO₃ - [22.99 + 1.01 + 12.01 + 3(16.00)] g/mol = 84.01 g/mol
1 L = 1000 mL
Step 3: Find moles of solute
[tex]14.7 \hspace{3} g \hspace{3} NaHCO_3(\frac{1 \hspace{3} mol \hspace{3} NaHCO_3}{84.01 \hspace{3} g \hspace{3} NaHCO_3} )[/tex] = 0.174979 mol NaHCO₃
Step 4: Find amount of solution
[tex]0.555 \hspace{3} M \hspace{3} NaHCO_3=\frac{0.174979 \hspace{3} mol \hspace{3} NaHCO_3}{x \hspace{3} L}[/tex]
[tex]0.555 \hspace{3} M \hspace{3} NaHCO_3(x \hspace{3} L)=0.174979 \hspace{3} mol \hspace{3} NaHCO_3[/tex]
[tex]x \hspace{3} L=\frac{0.174979 \hspace{3} mol \hspace{3} NaHCO_3}{0.555 \hspace{3} M \hspace{3} NaHCO_3}[/tex]
[tex]x \hspace{3} L=0.315278[/tex]
Step 5: Convert
[tex]0.315278 \hspace{3} L(\frac{1000 \hspace{3} mL}{1 \hspace{3} L} )[/tex] = 315.278 mL
Step 6: Simplify
We are given 3 sig figs.
315.278 mL ≈ 315 mL
