Answer:
Carbon And the number of protons
What do you predict will happen to the volume inside a container when pressure & temperature remains constant but the number of particles inside is increased? WHY?
Answer:
increase
Explanation:
The Ideal Gas Equation
PV = nRTV = nRT/PV ∝ nThe volume of a gas is directly proportional to the number of moles it contains. Hence, if the number of particles is increased, then the volume inside the container will increase
If the pH of a solution is 8.45, what is the concentration of the OH-?
Answer:
How do you find the concentration of OH in a solution?
The hydroxide ion concentration can be found from the pOH by the reverse mathematical operation employed to find the pOH. [OH-] = 10-pOH or [OH-] = antilog ( - pOH) Page 2 Example: What is the hydroxide ion concentration in a solution that has a pOH of 5.70? On a calculator calculate 10-5.70, or "inverse" log (- 5.70).Explanation:
5
Select the correct answer.
In the Arrhenius equation, which variable represents the activation energy for the reaction?
A. Ea
B. R
C.T
D.k
Answer:
A. Ea, activation energy,, hope this helps.
19. What is Beryllium's spin ?
Answer:
Nuclear properties
Naturally occurring beryllium, save for slight contamination by the cosmogenic radioisotopes, is isotopically pure beryllium-9, which has a nuclear spin of 3/2.Beryllium is alloyed with copper or nickel to make springs, gyroscopes, electrical contacts, spot-welding electrodes and non-sparking tools, according to the Royal Society of Chemistry. Other beryllium alloys are used in high-speed aircrafts and missiles, as well as spacecraft and communication satellites.
Explanation:
hope this helps if not let me know
What is a standard solution?
Answer:
A standard solution is any chemical solution which has a precisely known concentration.
Sodium Chloride for example.
Explanation:
Answer:
A standard solution is solution containing precisely known concentration of an element or a substance
Which indicator most likely suggests that a chemical change is taking place?
change in size
change of color
Ochange of state
O change in shape
Answer:
change of color
Explanation:
One or more of the following events can indicate that a chemical reaction has occurred: The reaction flask's interior has undergone a color shift. A change in color and the appearance of bubbles are two indications of a chemical shift. The correct option is B.
A large variety of various observable characteristics, such as color change, energy change (temperature change or light produced), gas production, precipitate formation, and property change, can be used to detect chemical reactions.
An indicator is a chemical substance that modifies color when an acid or base is present. Indicators are often mildly acidic or basic in nature and originate from plant pigments.
Thus the correct option is B.
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4. Which of the following involves the largest consumption of fresh water resources?
a. Recreational purposes by humans
b. Agricultural processes
c. Drinking purposes by humans
d. Industrial processes
PLEASE HELP ASAPP!!!!! PLEASE I’LL TRY TO GIVE BRAINLIEST!
What is a benefit of fossil fuel consumption?
low pollution
increased greenhouse gases
renewable resource
cheap energy
Answer:
Cheap energy
Explanation:
Fossil fuels such as coal, oil, and gas are widely available and are much cheaper than other forms of energy (wind, nuclear, etc.) Fossil fuel products are also quite efficient, as the efficieny of fossil fuels is about 50% (which is actually really good), while solar panels for example are only about 15% efficient.
What do you think is the reason for an increasing atomic radius within one group?
Answer:
As you go down a group on the periodic table, you get more electron shells and therefore a larger atomic radius.
Substances that cause the oxidation of other substances are
a, reducing agents,
b. oxidizing agents,
c. catalysts.
d. cells.
==============================
[tex]\large \sf\underline{Question:}[/tex]
Substances that cause the oxidation of other substances are;==============================
[tex]\large \sf\underline{Answer:}[/tex]
[tex] \qquad \qquad \huge \bold{Option \: B}[/tex]
==============================
[tex]\large \sf\underline{Explanation:}[/tex]
Substances that cause the oxidation of other substances are oxidizing agents.==============================
Please Help Me with this
Answer:
compared to sodium, silicon has a higher ionization energy meaning it takes more energy to remove electrons.
Explanation:
hope this helps
can u please give me and Brainlist
Which of the following is most likely caused by chemical weathering?
Chemical weathering is caused by rain water reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts.
What is chemical weathering?Chemical weathering changes the molecular structure of rocks and soil.
Chemical Weathering is defined as the chemical reaction that takes place between the rain, flowing water, and rocks along with minerals.
It results in the decaying of minerals and the rocks for the formation of new minerals, as we as, the soluble salts due to the reaction being highly acidic.
Since the reaction is acidic, it causes 'unrecognizable facial features on a marble statue.
These reactions occur particularly when the water is slightly acidic.
Thus, chemical weathering is caused by rainwater reacting with the mineral grains in rocks to form new minerals (clays) and soluble salts.
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7. The picture below shows a girl with a widow's peak. Widow's peak She has a widow's peak because of her -
Answer:
genes (c)
Explanation:
since traits are passed down genetically, so her mother or father must have one (or even one of her grandparents)
hope this helps!:)
Answer: D.
Explanation:looks right to me it’s for sure not A hope did helped
The temperature of 2,000.0 g water is raised 3.00°C. How much
energy is transferred to the water. Use the formula below and use your
notes. The specific heat (Cp) for water is 4.18 J/g • °C. Round to three
significant digits. See your notes and slides.
Answer:
25 080 j ( Rounded to 25100 j)
Explanation:
FROM THE EQUATION
?? = 4.18 * 2000 * (3) = 25 080 j
Green light has a frequency of about 6.00×1014s−1 . What is the energy of a photon of green light?
Which compound, on the basis of its name, has a carbon-carbon triple bond? chlorobutane butane butene butyne
The compound that has Carbon-Carbon triple bond is Option D , Butyne.
What is Alkyne ?
An alkyne is an unsaturated hydrocarbon containing at least one carbon—carbon triple bond.
The general chemical formula is [tex]\rm C_{n} H_{2n-2}[/tex]
Like other hydrocarbons, alkynes are generally hydrophobic.
Butyne is an alkyne that contains 4 carbon and 6 hydrogen. It contains one triple bond and has two isomeric organic chemical compounds
1-Butyne (ethylacetylene)
2-Butyne (dimethylacetylene)
Therefore the compound that has Carbon-Carbon triple bond is Option D , Butyne.
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calculate the molarity of 500.0 mL of solution in which 50.0g of HCL has been dissolved
[tex]\huge\underline\mathcal{\red{A}\blue{n}\pink{s}\purple{w}\orange{e}\green{r} -}[/tex]
Given - 500 mL of solution containing 50g waterTo calculate - molarity of the solutionWe know that ,
[tex]Molarity \: (M) = \frac{no. \: of \: moles \: of \: solute }{volme \: of \: solution} \\[/tex]
it can be seen that we aren't provided with the no. of moles of solute in the question.
So let's calculate it using the given formula ~
[tex]no. \: of \: moles \: of \: solute = \frac{given \: mass}{molar \: mass} \\ \\ \longrightarrow \: \frac{50}{36.5} \\ \\ \longrightarrow \: 1.37 \: moles \: ( \: approx \: )[/tex]
Also ,
we're given that volume of solution = 500 mL = 0.5 L
Substituting the values in the formula of molarity , we get
[tex]Molarity = \frac{1.37}{0.5} \\ \\ \bold{\implies \: \boxed{Molarity = 2.74M}}[/tex]
hope helpful ~
Activist groups have helped increase awareness of the dangers of drinking and driving.
A. True
B. False
Which of the following is made of tissues and is part of an organ system?
The heart is made of tissues and is part of an organ system.
What is a tissue?Tissue is a group of cells that have a similar structure and that function together as a unit.
The cardiovascular system is the system responsible for delivering blood to different parts of the body.
It consists of the following organs and tissues: The heart: A muscular pump that forces the blood around the body.
Hence, heart is made of tissues and is part of an organ system.
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How many significant figures
are in this number?
0.00521
The significant figures in the number 0.00521 is : 3 Significant figures.
Meaning of significant figuresSignificant figure can be defined as numbers within the number system that has value or gives value to a number list.
Significant figures are numbers that has a measure of value assigned to them as a reason of where they are placed.
In conclusion, the number above contains only three significant figures.
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What happens when two substances of different temperatures come in contact with each other?
Answer:
The hotter one loses heat and the cooler one gains heat until they become equal in temperature.
[?] describes the three dimensional highly repeating particles within a solid?
Answer: crystal lattice
pleaseeeeeeeeeeee help this is due today
The final temperature of the sample of gas is 689.65 Kelvin.
What is the relation between temperature and pressure?Relation between the temperature and pressure will be represented by the ideal gas equation PV = nRT, and for this question required equation is:
P₁/T₁ = P₂/T₂, where
P₁ & T₁ are the pressure and temperature of the initial sample.
P₂ & T₂ are the pressure and temperature of the final sample.
Pressure is in mmHg and on putting values from the question on the above equation, we get
T₂ = (810)(390.8) / (760) = 416.5 degree C = 689.65K
Hence required temperature of the sample is 689.65K.
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NH3 has a concentration of exactly 2.55 M has a Kb of 9.88 x 10-8 M.
a. What is the value of Kb expression for this acid?
b. What is the pH of this solution?
From the calculations, we can see that the pH of the solution is 2.3
What is Kb?The term Kb is know as the base dissociation constant. It gives the extent to which a base dissociates in solution.
Hence;
Ka = Kw/Kb = 1 * 10^-14/ 9.88 x 10-8 = 1 * 10^ -7
We have to set up the ICE table;
NH4^+(aq) + H2O(l)⇔ H3O^+(aq) + NH3(aq)
I 2.55 0 0
C -X +X +X
E 2.55 - x x x
Ka = [H3O^+] [NH3]/[NH4^+]
1 * 10^ -7 = x^2/2.55 - x
1 * 10^ -7 (2.55 - x) = x^2
x^2 - 2.55 * 10^ -7 + 1 * 10^ -7x = 0
x=0.0005 M
So; [H3O^+] = [NH3] = 0.0005 M
pH = -log(0.0005 M) = 2.3
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2.0 moles of H3PO4 equals how many atoms of O
Considering the definition of compound, chemical formula and Avogadro's Number, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.
What is compound and chemical formulaIn a compound there are atoms of different elements joined by forces that we call chemical bonds.
The chemical formula indicates the number and type of different atoms present in the molecule.
Avogadro's NumberAvogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.
Atoms of OIn this case, in 1 mole of the compound H₃PO₄ you have:
3 moles of H.1 mol of P.4 moles of O.Then, in 2 moles of H₃PO₄ you have 8 moles of O.
Now, you can apply the following rule of three: if by definition of Avogadro's number 1 mole of oxygen contains 6.023×10²³ atoms, 8 moles of oxygen contains how many oxygen atoms?
[tex]number of atoms=\frac{8 molesx6.023x10^{23}atoms }{1 mole}[/tex]
number of atoms= 4.8184×10²⁴ atoms
Finally, there are 4.8184×10²⁴ atoms of O in 2 moles of H₃PO₄.
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An unknown solid object with a mass of 35.0 g was heated to 100.0 °C and transferred to a calorimeter containing 50.0 g of water at 23.0 °C. After thermal equilibrium was reached, the temperature inside the calorimeter was 26.5 °C. Calculate the specific heat of the unknown solid (specific heat of water = 4.184 J/g°C).
Taking into account the definition of calorimetry, the specific heat of the unknown solid is 0.285 [tex]\frac{J}{gC}[/tex].
What is calorimetryCalorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where:
Q is the heat exchanged by a body of mass mc is the specific heat of the substance c ΔT=Final temperature - Initial temperature is the temperature variation.Specific heat of the unknown solid
In this case, you know:
For the unknown solid:Mass of solid = 35 gInitial temperature of solid= 100 °CFinal temperature of solid= 26.5 ºCSpecific heat of solid= unknownFor water:Mass of water = 50 gInitial temperature of water= 23 ºCFinal temperature of water= 26.5 ºCSpecific heat of water = 4.186 [tex]\frac{J}{gC}[/tex]Replacing in the expression to calculate heat exchanges:
For unknown solid: Qsolid= csolid × 35 g× (26.5 - 100)°C
For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× 50 g× (26.5 - 23)°C
If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.
Then, the heat that the solid gives up will be equal to the heat that the water receives. Therefore:
- Qsolid = + Qwater
Replacing the corresponding expressions:
- csolid × 35 g× (26.5 - 100)°C= 4.186 [tex]\frac{J}{gC}[/tex]× 50 g× (26.5 - 23)°C
Solving:
csolid × 2,572.5 g×°C= 732.55 J
csolid =732.55 J÷ 2,572.5 g×°C
csolid=0.285 [tex]\frac{J}{gC}[/tex]
Finally, the specific heat of the unknown solid is 0.285 [tex]\frac{J}{gC}[/tex].
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A system is a group of parts that can be considered one unit. Storm systems, ecosystems, and our bodies are natural systems. Cars and houses are human-made systems. Choose an example of a system, and analyze the energy flow through the system. Describe in detail how energy enters the system, how energy changes form while in the system, and how energy leaves the system.
An ecosystem is simply a collection of communities of plants, animals, and microbes interacting together and with their physical environments.
Energy flow in an ecosystemEnergy enters the ecosystem through a group of living organisms known as the producers. the producers are mainly the green plants that are capable of photosynthesizing.
Photosynthesis converts solar radiation from the sun to chemical energy in green plants. Another group of organisms in the ecosystem, the primary consumers, feed directly on the producers and as such, are able to gain some energy from them.
The secondary consumers obtain their own energy by feeding on primary consumers. Tertiary consumers feed on the secondary consumers for their own energy and the food chain goes on and on.
Only about 10% of the available energy in one trophic level goes to the next trophic level. The rest of the energy is lost as heat to the surroundings. Thus, the producers have the highest energy in the ecosystem while organisms at the top of the food chain have the lowest energy.
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What is the nuclear composition of uranium-235?
92 electrons + 143 protons
92 protons + 143 electrons
O 143 protons + 92 neutrons
O 92 protons + 143 neutrons
♡
Answer:
The nuclear composition of uranium-235 is 92 protons and 143 neutrons.
This is an impossible formula. Pretend it is real.
If you had 1 mol of Mn6(ClO4)3 how many moles of O would there be? Make sure your answer includes TWO decimal places.
Moles are the ratio of grams to the grams per mole. There are 12 moles of oxygen after dissociation.
What is dissociation?Dissociation is the release of the ions, cations, and anions of the molecular compound in the water. The dissociation of the compound is shown as:
Mn₆(ClO₄)₃ ⇆ 6 Mn³⁺ + 3ClO⁴⁻
From the dissociation, it can be said that 1 mole of magnesium chlorate dissociates into 12 moles of oxygen atoms.
Given, that the moles of the compound is 1 mole.
Then moles of oxygen atom will be: 1 × 12 = 12 moles
Therefore, 12 moles of oxygen atoms are produced from the dissociation of the compound.
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This is an impossible formula. If it were real, determine the molar mass of:
Fe1S1O5
Ammonium lauryl sulfate has a molar mass of 283.43 g/mol.
What is ammonium lauryl sulfate, and how does it work?Ammonium dodecyl sulfate is another name for it. It's in the shampoos we use on our hair. Both polar and non-polar solvents can dissolve it. It can irritate the skin at times.
Thus, the ammonium lauryl sulfate molar mass is 283.43 g/mol.
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