Answer:
48 000 cm^2
Explanation:
8000 1cm cubes
each 1 cm cube side is 1 cm^2 and there are six sides to the cube , so each cube has 6 cm^2 surface area
and there are 8000 of them 8000 * 6 cm^2 = 48 000 cm^2
A copper foil is made from copper, absolutely free of impurities. Which term or terms could be used to describe this sample of copper
Answer:
Explanation:
pure chemical substances and element.
All elements are pure. If this sample of copper had been impure, we would call it a mixture, not an element.
35.0g of zinc oxide react with what volume of oxygen at stp given the following reaction: zn + o2 --> zno
The volume of oxygen that would react at STP will be 6.00 L
Stoichiometric calculationFrom the equation of the reaction:
[tex]2Zn + O_2 --- > 2ZnO[/tex]
The mole ratio of [tex]O_2[/tex] to the ZnO produced is 1:2
Mole of 35 g Zn = 35/65.3 = 0.536 moles
Equivalent mole of [tex]O_2[/tex] that will react = 0.536/2 = 0.268 moles
1 mole of gas at STP = 22.4 L
0.268 moles of gas = 0.268 x 22.4 = 6.00 L
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How many grams of NH4NO3 are required to produce 4.29 g of N2O?
Answer:
To produce 1 mole of N2O required 1 mole of NH4NO3 . Hence, 60 grams of NH4NO3 are required to produce 33.0 g N2O
Explanation:
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The lewis dot structure rule states that
s=n-a.
recall that s represents the.total
number of valence electrons needed for
all the atoms in a molecule to achieve an
octet.
what is s for silicon tetrachloride, sic14?
Answer:
32
Explanation:
The total valence electron is available for the Silicon tetrachloride
lewis structure is 32
Evaluate which factor is most likely to cause the concentration of greenhouse gases in the earth's atmosphere to increase?
A.
decreased number of decomposing plants
B.
decreased number of volcanic eruptions
C.
increased frequency of earthquakes
D.
increased human industrial activities
Answer:
D. increased human industrial activities
what is the atomic number of sodium
The atomic number of sodium atom (Na) is 11.
What is atomic number?Atomic number of any atom is denoted by the symbol Z, and it is equal to the number of protons or electrons present in that atom.
In the sodium atom, number of proton is equal to 11 and number of electrons is also equal to 11. So the atomic number of sodium atom is 11.
Hence atomic number of sodium is 11.
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The atomic number of sodium is 11.
1. The atomic number of an element represents the number of protons in the nucleus of its atom.
2. Sodium is an element with the symbol Na, and its atomic number can be found on the periodic table.
3. Locate sodium (Na) on the periodic table. It is in the third period and belongs to Group 1, also known as the alkali metals.
4. The atomic number is usually displayed above or below the element's symbol. In the case of sodium, the atomic number is 11.
5. Therefore, the atomic number of sodium is 11. It means that a neutral sodium atom has 11 protons in its nucleus.
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Jack would probably say his lines with a _______ voice.
A. puzzled
B. delighted
C. whining
A. because he might be in trouble in a play
The concentration of reactants and products and the rate of reaction were measured during a chemical reaction. After the first 3 seconds, the rate of reaction was 1.8 x10−6 M/s. Which of the following would explain a lower rate after another 3 seconds?
The concentration of reactants increased while the concentration of product decreased.
The concentration of reactants decreased while the concentration of product increased.
All concentrations of reactants and products decreased.
All concentrations of reactants and products increased.
Lower rate after another 3 seconds of the given rate is concentration of reactants increased while the concentration of product decreased.
What is the rate of reaction?Rate of the reaction gives idea about the speed of the completion of the reaction or the formation of product.
Given rate of reaction = 1.8×10⁻⁶ m/sec
After 3 seconds rate of the reaction decreases, which means speed of the formation of product decreases as a result of which:
Concentration of product decreases.Concentration of reactant increases.Hence, concentration of reactants increased while the concentration of product decreased.
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Answer:
B. The concentration of reactants decreased while the concentration of product increased.
Explanation:
i took the test
What is the molarity of a solution that has 90 mol of solute dissolved in 6 liters of solvent? ___ M
Answer:
15M
Explanation:
To find molarity, you use the equation :
Molarity = [tex]\frac{moles of solute}{liters of a solution}[/tex]
So to find the molarity, you would do 90mols of the solute divided by 6 liters of the solvent which is 15M.
How many grams of iron are in 3.2 moles of iron
Answer:
17.03052
Explanation:
thats the answer i got hope this helps at all
Which type of fossil can be described as dead wood that has turned into stone?
a. cast fossil
b. sedimentary fossil
c. petrified
d. mold fossil
Answer:
The answer is c hope it is right if it is rong please tell me tho :)
Which of the following is the best hypothesis?
OA. Physical changes are much less interesting to watch than
chemical changes.
B. If sodium carbonate is added to vinegar, the reaction will absorb
heat.
C. Tearing a piece of paper is an example of a physical change.
D. Some chemical reactions absorb heat, and others release heat.
SUBMIT
Help me y’all
Answer:
B.) If sodium carbonate is added to vinegar, the reaction will absorb heat.
Explanation:
A.) is incorrect because this is not testable. Rather, it is just an opinion that cannot be proven correct or incorrect.
B.) is correct because this statement is testable. Tests need to be run to determine the accuracy of the statement.
C.) is incorrect because this statement explains something that does not need to be tested. It is an example of a physical change when one tears a piece of paper.
D.) is incorrect because this is already a true statement. It is obvious that not all reactions absorb/release heat. While tests could be run to further prove this statement true, it is already considered accurate.
An aluminum aerosol can will burst if the pressure inside reaches 210.0 psi. if the can initially contains an ideal gas at 459.5 kpa at 298.15 k, at what temperature (in k) will the can burst?
The can will burst at 938.45 K.
What is Gay Lussac's Law ?Gay Lussac's Law states that the pressure of a fixed amount of gas is directly proportional to the absolute temperature at constant volume.
i.e. P ∝ T
P= KT
P₁ = KT₁
P₂ = KT₂
Here we have considered that the gas is at two different temperatures and pressures which is denoted by T₁ , T₂ and P₁ , P₂
It can also be written as
(P₁ /P₂ ) = (T₁ / T₂)
It is given that
P₂ = 14.29 atm
P₁ = 4.535 atm
T₁ = 298.15 K
T₂ = ?
T₂ = (298.15 * 14.29 )/ 4.54
T₂ = 938.45 K
Therefore the can will burst at 938.45 K.
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-0)
2H2(g) + O2(9) - 2H20(9)
How many liters of Hy are required to form 5 moles of H20 at STP?
)
A)
)
11.2 liters
B)
22.4 liters
44.8 liters
D
112 liters
Now
At STP any gas weighs 22.4L
Volume of H_2
22.4+(5)112LWhich pair of molecules has hydrogen bonding interactions?.
Answer:
Hydrogen bonding is a special type of dipole-dipole interaction that occurs between the lone pair of a highly electronegative atom (typically N, O, or F) and the hydrogen atom in a N–H, O–H, or F–H bond.
What kind of radioactive element is useful for dating an object?
a. one with a half-life close to the age of the object
b. one that is present in very small amounts
c. one that decays very quickly into a stable form
d. one that does not undergo transmutation
The kind of radioactive element is useful for dating an object is one with a half-life close to the age of the object.
What are radioactive elements?Radioactive elements are elements that involved in radioactivity and this comprises of atoms or particles in their nuclei whose atomic nuclei are not stable and they emit radiations to maintain stability.
Therefore, The kind of radioactive element is useful for dating an object is one with a half-life close to the age of the object.
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If you have 294grams of a decaying isotope, how many grams will remain active after 4 half-lifes?
Answer:
18.375 gm left
Explanation:
1/2 ^4 = 1/16th will be left (see the '4' representing 4 half lives?)
294 * 1/16 = 18.375 gm
Which is the balanced equation for v2o5 cas → cao v2s5? v2o5 cas → cao v2s5 5v2o5 5cas → 10cao 5v2s5 3v2o5 3cas → 3cao 3v2s5 v2o5 5cas → 5cao v2s5
We have the balanced reaction equation as; V2O5 + 5CaS → 5CaO + V2S5.
What is a balanced reaction equation?A balanced reaction equation is one in which the number atoms atoms on the reactant side is the same as the number of atoms on the products side.
In that case, we have the balanced reaction equation as; V2O5 + 5CaS → 5CaO + V2S5.
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Answer:
d
Explanation:
got 100
What are some applications of fission reactions? as a zero-waste energy source for generating large amounts of heat for creating stable elements from unstable ones for creating new, heavier elements as the energy source in nuclear weapons
Some of the applications of fission reactions are as follows:
for generating large amounts of heatfor creating stable elements from unstable onesas the energy source in nuclear weaponsWhat are nuclear fissions?Nuclear fission is a nuclear reaction in which a large nucleus splits into smaller ones with the simultaneous release of energy.
Nuclear fission involves the release of radioactive particles which causes a decrease in the number of atoms.
Nuclear fission have the following applications in industry:
for generating large amounts of heatfor creating stable elements from unstable onesas the energy source in nuclear weaponsLearn more about nuclear fission at: https://brainly.com/question/913303
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V. What volume of nitric oxide will diffuse out of a porous partition in 10 seconds when 25 ml of methane diffuse out in 4 seconds?
The volume of nitric oxide that will diffuse out of the partition in 10 seconds when methane diffuses is 62.5 mL
What is rate of diffusion?This is defined as the amount diffused per unit time. Mathematically, it can be expressed as
Rate = volume / time
How to determine the rate of diffusion of methaneVolume of methane = 25 mLTime = 4 sRate = ?Rate = volume / time
Rate = 25 / 4
Rate = 6.25 mL/s
How to determine volume of nitric oxideTime = 10 sRate = 6.25 mL/sVolume of nitric oxide = ?Rate = volume / time
6.25 = volume of nitric oxide / 10
Cross multiply
Volume of nitric oxide = 6.25 × 10
Volume of nitric oxide = 62.5 mL
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Just look at pic please it has the question and answers
[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]
Let's balance the given equation ~
[tex]\qquad \sf \dashrightarrow \:S_8 + O_2 \rightarrow SO_3[/tex]
[tex] \textsf{Step 1 - balance Sulphur (S) on both sides} [/tex]
[tex] \textsf{[ By multiplying} [/tex] [tex] \sf{SO_3} [/tex] [tex] \textsf{by 8 on product side ]} [/tex]
[tex]\qquad \sf \dashrightarrow \:S_8 + O_2 \rightarrow 8 \: SO_3[/tex]
[tex] \textsf{Step 2 - balance Oxygen (O) on both sides} [/tex]
[tex] \textsf{[ By multiplying} [/tex] [tex] \sf{O_2} [/tex] [tex] \textsf{by 12 on reactant side ]} [/tex]
[tex]\qquad \sf \dashrightarrow \:S_8 +12 \: O_2 \rightarrow 8 \: SO_3[/tex]
So, we can infer that the Correct choice is D
what is the important of Noble gases
Answer:
most often helium and argon, the least expensive—are used to provide chemically unreactive environments for such operations as cutting, welding, and refining of metals such as aluminum (atmospheric oxygen and, in some cases, nitrogen or carbon dioxide would react with the hot metal).
hope this helps
Please help I do not understand
A model of materials will show dense materials having tightly packed particles while less dense materials will have greater spaces between their particles.
What is density?Density is a measure of the compactness of a material.
Density is defined as the ratio of mass to the volume of a substance.
Density = mass/volumeDense materials have tightly packed particles while less dense materials have greater spaces between their particles.
Avogadro's hypothesis applies to substances in gaseous form since they do not have a constant volume.
Therefore, a model of materials will show dense materials having tightly packed particles while less dense materials will have greater spaces between their particles.
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what is the law of Conservation of mass ?
Some calcifiers can use bicarbonate (HCO3-) to make their shells.
How will they be affected by the decrease in pH?
Answer:
The removal of this ion from water by the calcifiers will definitely decrease the pH of water.
What is the bicarbonate ion?
The bicarbonate ion is the ion that is designated as HCO3-. We must notice that this ion is present in abundant amounts in the sea. This amount definitely make the sea slightly alkaline.
Now we must note that the removal of this ion from water by the calcifiers that require it to make their shell will definitely decrease the pH of water.
Explanation:
The removal of this ion from water by the calcifiers will definitely decrease the pH of water.
What is the bicarbonate ion?The bicarbonate ion is the ion that is designated as [tex]HCO^{3-}.[/tex] We must notice that this ion is present in abundant amounts in the sea. This amount definitely makes the sea slightly alkaline.
Now we must note that the removal of this ion from water by the calcifiers that require it to make their shell will definitely decrease the pH of water.
Hence, the removal of this ion from water by the calcifiers will definitely decrease the pH of water.
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HELP ASAP PLEASE!!!!!!!Which statements describe what happens in a redox reaction? Check all that apply. A. One substance gains electrons and one substance loses electrons. B. Electrons are moved between two substances. C. There are two reduction reactions. D. The anions on two compounds trade places
Electrons are moved between two substances.
How is knowing conduction of heat useful to us? Explain in your own words please xx
There are a lot you want to know about heat transfer.
If u understand the mode of heat transfer well, then heat transfer is easy to continue.
Answer:
1: They give to the body Vitamin D 2: they give solar energy and that is what gives us revaluation around the sun (Drag) 3: it gives plants energy for photosynthesis (or dont know)
4:solar panels gives energy by the sun radio controlled area that gives us the battery's, lights etc...
Explanation:
EXPLAIN IT
This atom can form up to _____ single covalent bond(s). An atom with two electron shells. There is one electron pair in the inner electron shell and four unpaired electrons in the outer electron shell. 0 1 4 2 3
Answer:
4
Explanation: it's a carbon atom right....soo it'll form 4 bonds(single)
An atom can form 4 single covalent bonds is carbon with two electron shell.
What are covalent bonds?The bonds are defined as a strong bond that binds atoms, ions, or molecules together and promotes the production of molecules.
There are three types of bonds.
Ionic bondCovalent bondMetallic bondCovalent bonds are defined as the bond formed by sharing of electrons with each other.
Covalent bonding is a stable equilibrium of the attractive and repulsive forces between two atoms that occurs when they share electrons. Bonding pairs or sharing pairs are other names for these electron pairs.
It can also be defined as a type of chemical link where atoms share electrons to create electron pairs.
Covalent bonds has low melting point, boiling point, enthalpy of fusion and enthalpy of vaporization.
Thus, an atom can form 4 single covalent bonds is carbon with two electron shell.
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A way of describing a chemical change that indicates what substances were present before the change and what substances are present after the change is called a _____.
A. chemical equation
B. chemical formula
C. chemical bond
D. All of the above
E. None of the above
Answer:
[tex]\\ \rm\dashrightarrow Chemical\: Equation [/tex]
Explanation:
When a chemical change happens or chemical reaction happens something yields at reactants and something at products
Representing them is called chemical equation
WILL GIVE BRAINLIEST What would the products of a double-replacement reaction between LiCl and MgO be? (Remember: In double-replacement reactions, the two cations switch places and the two anions switch places.)