What is the mass of a cube of aluminum that is 3. 0 cm on each edge? The density of aluminum is 2. 7 g/cm3
Answers
The mass of the aluminum cube is 72.9 g.
The following formula can be used to determine the cube's volume;
V = a³
where a will be the length of the edge of the cube.
In this case, a = 3.0 cm, so we have:
V = 3.0 cm × 3.0 cm × 3.0 cm
V = 27.0 cm³
The formula of density can be used to get the cube's mass;
ρ = m/V
where ρ will be the density, m will be the mass, and V will be the volume.
In this case, the density of aluminum is given as 2.7 g/cm³, so we have:
2.7 g/cm³ = m/27.0 cm³
Solving for m, we get;
m = 2.7 g/cm³ × 27.0 cm³
m = 72.9 g
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Related Questions
What is the balanced reaction for the cell diagram below? al(s) | al³⁺(aq) || cd²⁺(aq) | cd(s)
A) Al34(aq) + Cd(s) → Al(s) + Cd2+ (aq)
B) 2 Al(s) + 3 Cd2+(aq) → 2 Al3+(aq) + 3 Cd(s)
C) 3 Al3+(aq) + 2 Cd(s) — 3 Al(s) + 2 Cd2+(aq)
D) Al(s) + Cd2+(aq) → Al3+(aq) + Cd(s)
E) 2 Al3+(aq) + 3 Cd(s) → 2 Al(s) + 3 Cd2+(aq)
Answers
The correct balanced reaction for the given cell diagram is option B:
2 Al(s) + 3 Cd²⁺(aq) → 2 Al³⁺(aq) + 3 Cd(s)
The balanced reaction for the given cell diagram can be determined by looking at the half-reactions occurring at each electrode. The cell diagram is written in the form:
Al(s) | Al³⁺(aq) || Cd²⁺(aq) | Cd(s)
The half-reaction at the anode (left side) is the oxidation half-reaction, and the half-reaction at the cathode (right side) is the reduction half-reaction.
From the cell diagram, we can identify the half-reactions as follows:
Anode (oxidation): Al(s) → Al³⁺(aq) + 3e⁻
Cathode (reduction): Cd²⁺(aq) + 2e⁻ → Cd(s)
To balance the number of electrons transferred in both half-reactions, we need to multiply the reduction half-reaction by 3 and the oxidation half-reaction by 2:
2 Al(s) → 2 Al³⁺(aq) + 6e⁻
3 Cd²⁺(aq) + 6e⁻ → 3 Cd(s)
Now, we can combine the balanced half-reactions to obtain the balanced overall reaction:
2 Al(s) + 3 Cd²⁺(aq) → 2 Al³⁺(aq) + 3 Cd(s)
Therefore, the correct balanced reaction for the given cell diagram is option B:
2 Al(s) + 3 Cd²⁺(aq) → 2 Al³⁺(aq) + 3 Cd(s)
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A. H2OB. NH3C. BH3D. CH4E. SiH4Which has a central atoms with less than an octet of electrons
Answers
A central atom with less than an octet of electrons is C.\(BH_{3}\)
\(BH_{3}\), or boron trihydride, consists of a central boron atom covalently bonded to three hydrogen atoms. In its ground state, boron has an electron configuration of 1s²2s²2p¹, which means it has three valence electrons. When forming bonds with the three hydrogen atoms, boron shares one electron with each hydrogen, resulting in a total of six electrons around the central boron atom.
This configuration is known as an incomplete or deficient octet, as the central boron atom does not follow the octet rule, which states that atoms tend to form bonds to have eight electrons in their valence shell. In the case of \(BH_{3}\), the central boron atom has only six valence electrons. On the other hand, the central atoms in the other molecules (A. \(H_{2} O\), B. \(NH_{3}\), D. \(CH_{4}\), and E. \(SiH_{4}\)) all follow the octet rule, as they have eight electrons in their valence shells when bonded to their respective surrounding atoms.
In summary, the molecule with a central atom having less than an octet of electrons among the given options is C. \(BH_{3}\), with boron as the central atom possessing only six valence electrons.
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where are noble gases located on the periodic table?
Answers
Hello! :)
Noble gases are located in group 8A in the periodic table.
Elements in this group contain 8 valence electrons, making them very stable elements. Some examples of elements in this group include Neon, Argon, and Krypton.
To make a table of the elements, dmitri mendeleev sorted the elements according to their. He then split the list of elements into several columns so that elements beside each other had similar.
Answers
To make a table of the elements, Dmitri Mendeleev sorted the elements according to their atomic mass. He then split the list of elements into several columns so that elements beside each other had similar atomic mass.
A periodic table of the chemical elements was first published by Dmitri Mendeleev in 1869 and was based on characteristics that recurred sometimes when he arranged the elements from lightest to heaviest. Mendeleev's periodic chart had gaps, which he believed would be filled by previously undiscovered elements with the right qualities. With relative atomic weights of 44, 68, 72, and 100, he gave them the names eka-boron, eka-aluminum, eka-silicon, and eka-manganese.
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How many kilograms does a 1.60 ton elaphant weigh
Answers
Answer:
1451.496
Explanation:
A unit of weight equal to 1,000 kilograms, or approximately 2,204.6 pounds
tons =
kg
______
1000.0
Angiosperms produce brightly colored blooms and sweet-smelling flowers. Why have angiosperms developed these adaptations? A. to ensure seed dispersal B. to keep predators from eating the plants C. to attract pollinators and help ensure fertilization D. to allow time for seed development
Answers
Answer:
C
Explanation:
Angiosperms have developed these adaptations because it attracts pollinators which helps the ecosystem grow.
Examine the snapshot of sedimentary layers shown here. Which statements accurately describe the relationship between these organisms? Select ALL that apply. A) Species B is more primitive than species C. B) Species A is more primitive than species B. C) Species C is more primitive than species B. D) Species B is more primitive than species A. E) All three species likely lived at the same time.
Answers
Answer:
The answer is: Species A is more primitive than species B.
Explanation:
Species A has worse genetics than all the other fishes.
Describe the benefits of using nanoparticles instead of other, larger technology.
Answers
Answer:
it has a huge surface-to-volume ratio, very high porosity and completely different physiochemical properties.
Explanation:
idk if the answer is good !
sorry
Iron(III) chloride, FeCl3, can be made by the reaction of iron with chlorine gas. How much iron, in grams, will be needed to completely react with 878.0 g of Cl2?
Have both the unbalanced and balanced chemical equations.
Explain how to find the molar mass of the compounds.
Explain how the balanced chemical equation is used to find the ratio of moles
Explain how many significant figures your answer needs to have.
The numerical answer
Answers
Answer:
I don't have how to do that in numerical figures
The amount of iron, in grams, that is needed to completely react with 878.0 g of \(Cl_2\) would be 460.392 grams
Stoichiometric problemIron (III) chloride is produced by reacting iron with chlorine as follows:
\(Fe + Cl_2 --- > FeCl_3\)
The balanced equation of the reaction goes thus:
\(2Fe + 3Cl_2 --- > 2FeCl_3\)
The mole ratio of iron to chlorine is 2:3.
Recall that: mole = mass/molar mass
Molar mass of \(Cl_2\) = 35.5 x 2
= 71 g/mol
Mole of 878.0 g \(Cl_2\) = 878/71
= 12.3662 moles
From the mole ratio, the equivalent mole of Fe from 12.3662 moles \(Cl_2\) will be:
12.3662 x 2/3 = 8.2441 moles
Mass of 8.2441 mole Fe = mole x molar mass
Molar mass of Fe = 55.845 g/mol
Mass of 8.2441 moles Fe = 8.2441 x 55.845
= 460.392 grams
The numbers in the final multiplication operation have 5 significant figures each. Thus, the significant figure of the final answer will also be 5.
in other words, the amount of iron needed to completely react with 878.0 g of \(Cl_2\) is 460.392 grams.
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balance in basic solution 3N2O4 + NaBr + 6NaOH → 6NaNO2 + NaBrO3 + 3H2O
Answers
The balanced chemical equation in basic solution is: 3N₂O₄ + 10NaBr + 18NaOH → 12NaNO₂ + 2NaBrO₃ + 9H₂O
To balance the equation in basic solution, first, balance the equation as if it were in acidic solution. Then, add enough hydroxide ions (OH⁻) to both sides of the equation to neutralize the hydrogen ions (H⁺) and form water molecules. In this case, there are no hydrogen ions on the reactant side, so only the product side requires hydroxide ions.
First, balance the equation in acidic solution:
3N₂O₄ + 10NaBr + 18NaOH → 12NaNO₂ + 2NaBrO₃ + 9H₂O + 6HBr
Next, add six hydroxide ions to the product side to neutralize the six hydrogen ions:
3N₂O₄ + 10NaBr + 18NaOH → 12NaNO₂ + 2NaBrO₃ + 9H₂O + 6HBr + 6OH⁻
Now, simplify the equation by canceling out the six hydrogen ions and six hydroxide ions:
3N₂O₄ + 10NaBr + 12NaOH → 12NaNO₂ + 2NaBrO₃ + 9H₂O
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lewis structure li2s
Answers
Answer:
Lew in the world of the world of the world of
The corrected Lewis structure for Li2S is represented by two lithium (Li) atoms bonded to a sulfur (S) atom with single bonds.
1. Determine the total number of valence electrons: Lithium (Li) is in Group 1 of the periodic table and has 1 valence electron.
Sulfur (S) is in Group 16 of the periodic table and has 6 valence electrons.
Since there are two lithium atoms in Li2S, we need to multiply the number of valence electrons of lithium by 2.
Total valence electrons = (2 × 1) + 6 = 8
2. Identify the central atom: In Li2S, sulfur (S) will be the central atom, as it is less electronegative than lithium (Li).
3. Connect the atoms with a single bond: Connect one lithium atom (Li) to the sulfur atom (S) using a single bond.
Li-S
4. Distribute the remaining electrons: Distribute the remaining six electrons around the outer atoms (lithium) and the central atom (sulfur). Each lithium atom requires two electrons for stability.
Li-S-Li
5. Check if all atoms have an octet: In this case, both lithium atoms (Li) have a full outer shell with two electrons each, satisfying the duet rule. The sulfur atom (S) has a complete octet with eight electrons.
Li-S-Li
The corrected Lewis structure for Li2S is represented by two lithium (Li) atoms bonded to a sulfur (S) atom with single bonds.
Each lithium atom has two electrons around it, and the sulfur atom has eight electrons, fulfilling the octet rule for stability.
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name the gas which is formed when coal is heated in the absense of air
Answers
Answer:
Coke
Explanation:
A solid fuel formed by heating coal in the absence of air is coke. Coke is black colored, tough porous substance. It is pure carbon.
what do u mean by change in state of matter?define it.
Answers
Answer:
The mode of changing from one state of matter into another state and back to the former or original state is called change in state of matter .
hope it is helpful to you
Answer:
change in one state from another and back in its own original is known as change in state of matter
Which is the unit for molar mass?
These are the choices
grams
g/mol
mole
Answers
The definition of a mole is the mass of a particular substance in kilos divided by the material's molar mass in grams per mol. Mathematically, the number of moles equals the molar mass of the substance in grams.
Why is this tooth called a molar?Molars are termed after the task they carry out, similar to incisors. The Latin word "mola," which meaning millstone, is the root of the term "molar." Your mouth's molars, which are found close to the back, grind food in the same way a mill grinds wheat into meal.
Molars redevelop twice?As a result, if something were to happen to a permanent tooth after it had developed, a new tooth would not develop to replace it. But don't be concerned. The various components of adult teeth are often durable enough to last. For instance, the exterior of the tooth, the enamel.
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most bottled water in the united states does not contain fluoride. group of answer choices true false
Answers
The statement that most bottled water in the United States does not contain fluoride is true. Fluoride is a chemical that is added to water to prevent tooth decay.
It is naturally present in some water sources, while it must be added to others. However, most bottled water in the United States does not contain fluoride. Many bottled water companies do not add fluoride to their products because they assume that people will get fluoride from other sources, such as toothpaste or tap water. Moreover, some bottled water brands come from natural springs that have fluoride levels that are lower than what is required for optimal dental health. In addition, not all bottled water products are created equal.
According to the FDA, bottled water that is sold in the United States must meet certain quality standards, but the regulations do not require that fluoride be added to the water. As a result, some bottled water brands do contain fluoride, but consumers must read the label to know for sure. The good news is that people who do not drink fluoridated water can still get fluoride from other sources. For example, they can use toothpaste that contains fluoride, eat foods that are high in fluoride, or take fluoride supplements. Overall, the statement that most bottled water in the United States does not contain fluoride is true. Consumers who want to know whether a particular brand of bottled water contains fluoride should read the label or contact the manufacturer for more information.
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. At time t=0, an aluminum bar (thermal diffusivity k=0.86 ) of length Lcm with completely insulated lateral surfaces and constant thermal properties is removed from boiling water (uB=100 degrees Celsius). Do the following i), ii), iii) for each of the scenarios, a-d, below i) Write down the initial-boundary value problem. That is, the PDE along with any initial and boundary conditions. ii) Without solving for u(x,t), describe the temperature distribution in the bar as t→[infinity] based on physical intuition. iii) Find the solution as t→[infinity] by solving the appropriate steady state equation. a) The two ends of the bar are immediately immersed in a medium with constant temperature 10 degrees Celsius. b) The end at x=0 is immersed in a medium with temperature 0 degrees Celsius and the end at x=L is completely insulated.
Answers
(i) The initial-boundary value problem for the given scenarios are as follows:
a) Scenario a:
PDE: ∂u/∂t = k * ∂²u/∂x²
Initial condition: u(x, 0) = 100 (boiling water temperature)
Boundary conditions: u(0, t) = 10, u(L, t) = 10 (constant temperature at the ends)
b) Scenario b:
PDE: ∂u/∂t = k * ∂²u/∂x²
Initial condition: u(x, 0) = 100 (boiling water temperature)
Boundary conditions: u(0, t) = 0 (temperature at x=0), ∂u/∂x(L, t) = 0 (thermal insulation at x=L)
(iii) The solution for the temperature distribution as time approaches infinity can be found by solving the appropriate steady state equation.
What is the expected temperature distribution in the bar as time approaches infinity?(i) The initial-boundary value problem formulation states the partial differential equation (PDE) governing the temperature distribution in the aluminum bar, along with the initial condition and boundary conditions.
In scenario (a), both ends of the bar are immersed in a medium with a constant temperature of 10 degrees Celsius, while in scenario (b), the end at x=0 is immersed in a medium with temperature 0 degrees Celsius and the end at x=L is insulated.
(ii) As time approaches infinity, the temperature distribution in the bar tends to reach a steady state.
In scenario (a), the temperature throughout the bar will eventually approach a constant value of 10 degrees Celsius, since both ends are immersed in a medium with that temperature.
In scenario (b), the temperature at x=0 will approach 0 degrees Celsius, while the temperature at x=L will remain constant due to thermal insulation.
(iii) To find the solution as time approaches infinity, we need to solve the appropriate steady state equation.
In scenario (a), the steady state equation is ∂²u/∂x² = 0, which implies that the temperature gradient is zero throughout the bar, resulting in a constant temperature of 10 degrees Celsius.
In scenario (b), the steady state equation is ∂²u/∂x² = 0 with the boundary condition u(0) = 0, which implies a linear temperature distribution from 0 degrees Celsius at x=0 to a constant temperature at x=L due to insulation.
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Examine the fossil. List the parts of the animal that you recognize. What kind of animal do you think this was?
Answers
Answer:
I think it was a huge fish. umm not sure
Explanation:
which of the following situations contains an example of a chemical reaction?
Answers
A bicycle rusting after it is left in the rain is an example of a chemical reaction because it involves oxidation (Option d).
What is a chemical reaction?A chemical reaction can be defined as a phenomenon in which one or more substances called reactants react to form one or more different compounds, which are known as products.
A chemical reaction may include an enzyme that works to increase the seed of the reaction in normal conditions by lowering the activation energy of the reaction.
Therefore, we can conclude that a chemical reaction such as oxidation in a bicycle is a process where reactants combine or break down to form the products of such reaction.
Complete question:
Which of the following situations contains an example of a chemical reaction?
a. Ice forming after water is placed in a freezer
b. Watercolor paint drying on paper
c. a sugar cube dissolving in a glass of water
d. a bicycle rusting after it is left in the rain
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what compound would form when magnesium and nitrogen combine
Answers
Answer:
magnesium nitride
Explanation:
Which is an example of a parasite and host relationship?
Answers
Answer:
A parasitic relationship is one in which one organism, the parasite, lives off of another organism, the host, harming it and possibly causing death. The parasite lives on or in the body of the host. A few examples of parasites are tapeworms, fleas, and barnacles.
Answer:Tapeworms are a common parasite that can live in humans. They go into the digestive system and get food by eating the hosts partly digested food.
Explanation:
calculate the number of moles of argon gas contained in a 4.00 l container at 1620. kpa and 25.0 oc. if the gas is helium instead of argon, will the answer change? explain 2.62 moles
Answers
The number of moles of argon gas in a 4L container at 1620KPa and 25C is 2.62 moles. This can be calculated by ideal gas equation. The number of moles will not change when the argon gas is replaced by helium gas.
What is an ideal gas equation?
The ideal gas equation states the relation between pressure, volume, number of moles and temperature. The pressure multiplied by volume is directly proportional to the number of moles multiplied to the temperature. The equation can be written as, PV = nRT.
According to the ideal gas equation,
PV = nRT
P is pressure, n is number of moles, T is temperature, V is volume.
n = 1620KPa x 4L / 8.314Jmol^-1K^-1 x 298K = 2.62 moles.
Therefore, according to ideal gas equation, 2.62 moles is the number of moles of the gas in 4L container with 1620KPa pressure and 25C temperature. The number of moles doesn't depend on the gas. So it doesn't change when argon gas is replaced with helium gas.
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what is the rock cycle explain and give branliest answer
Answers
The Rock Cycle is a continuous process of transformation in which rocks of one kind are changed into rocks of another kind.
It is the process of gradual and continuous change in the type of rocks present in the Earth's crust. Sedimentary, igneous, and metamorphic rocks are the three main categories of rocks. The production of igneous rocks from molten magma, which cools and hardens, starts the cycle. Then, weathering, erosion, and other processes transform these rocks into sedimentary rocks.
Then, sedimentary and igneous rocks can undergo metamorphism due to heat and pressure from deep below the Earth. Metamorphic rocks can also transform back into sedimentary and igneous rocks, reversing the process.
When the metamorphic rocks are once more transformed into molten lava, the cycle is finished. The Rock Cycle, which explains the origins of the various types of rocks, is a significant aspect of Earth's history.
The formation, evolution, and recycling of rocks over time must also be understood.
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H2(g) + l2(g) -- 2H1(g)
A student makes the following statements:
Hydrogen always has the same oxidation number, so it has an oxidation number of +1 in both the reactant H2 and product HI.
lodine is in Group VIIA, so it has an oxidation number of -1 in both the reactant l2 and product HI.
Neither hydrogen nor iodine changes oxidation states, so the reaction is not a redox reaction.
In three to five sentences, describe the mistake that the student made, and determine whether or not the reaction is a redox reaction.
Explain your answer.
(4 points)
9E
Short Answer Rubric (4 points)
Answers
The given chemical equation is a redox reaction as it involves no net change in the oxidation number of reactants and products,hence the oxidation number remains the same.
What is a redox reaction?Redox reactions comprise of two parts a reduced part and an oxidized part, which occur simultaneously . The part which is reduced gain electrons and hence there is a increase in oxidation state of the species.
While, the part which is oxidized looses electrons and hence there is a decrease in oxidation state of the species.During redox reactions, there is no net change in the number of electrons . Electrons which are given off in oxidation are used up in reduction.
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Mr. Vincent, the psychology teacher, invited his students stay after school to participate in a study on learning styles so that he could better understand how to teach them. 25 of his students participated.
Is this a random sample of the teacher's students?
Answers
Can you guys please help me with this chart PLEASEEE?
Answers
If the same large amount of heat is added to a 250 g piece of aluminum and a 150 g piece of aluminum, what will happen?
Answers
please vote me brainliest i really need it for i can do my work
Witch element is the number 14 on the periodic table
Answers
Answer:Silicon
Explanation:
Silicon - Element information, properties and uses | Periodic Table.
Royal Society of Chemistry › 14 › si...
Silicon - Element information, properties and uses | Periodic Table
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What is the pH of a 0.40 M solution of K2SO3? Please give
specific detail of each step and calculation (including ice chart
if needed).
Answers
From the given information , the pH of a 0.40 M solution of K2SO3 is approximately 8.45.
Step 1: Write the balanced chemical equation for the dissociation of K2SO3 in water.
K2SO3 (aq) ↔ 2K+ (aq) + SO3^2- (aq)
Step 2: Identify the ions formed and their concentrations.
From the balanced equation, we can see that for every 1 mole of K2SO3 that dissolves, 2 moles of K+ and 1 mole of SO3^2- ions are produced. Therefore, the concentration of K+ ions is 2 × 0.40 M = 0.80 M, and the concentration of SO3^2- ions is 0.40 M.
Step 3: Determine the hydrolysis reaction and equilibrium expression.
The K+ ion does not undergo hydrolysis since it is the conjugate cation of a strong base. However, the SO3^2- ion can hydrolyze in water according to the following reaction:
SO3^2- (aq) + H2O (l) ↔ HSO3^- (aq) + OH^- (aq)
The equilibrium expression for this hydrolysis reaction is:
Kw = [HSO3^-] [OH^-] / [SO3^2-]
Step 4: Set up an ICE (Initial, Change, Equilibrium) table.
Let x be the concentration of OH^-. Since 1 mole of OH^- is produced for every 1 mole of SO3^2- that hydrolyzes, the change in concentration for OH^- is also x. The initial concentration of SO3^2- is 0.40 M, and the initial concentration of HSO3^- is assumed to be negligible. The initial concentration of OH^- is 0 M.
Initial: [SO3^2-] = 0.40 M, [HSO3^-] = 0 M, [OH^-] = 0 M
Change: [SO3^2-] = -x M, [HSO3^-] = x M, [OH^-] = x M
Equilibrium: [SO3^2-] = 0.40 - x M, [HSO3^-] = x M, [OH^-] = x M
Step 5: Substitute the equilibrium concentrations into the equilibrium expression.
Kw = [x] [x] / [0.40 - x]
Step 6: Simplify the expression and solve for x.
Since the concentration of OH^- is much smaller than 0.40 M, we can approximate 0.40 - x to be 0.40.
Kw = x^2 / 0.40
Given that Kw is 1.0 × 10^-14 at 25°C, we can solve for x:
1.0 × 10^-14 = x^2 / 0.40
x^2 = 1.0 × 10^-14 × 0.40
x = √(1.0 × 10^-14 × 0.40)
x ≈ 6.32 × 10^-8 M
Step 7: Calculate the pOH and pH.
pOH = -log10 [OH^-] = -log10 (6.32 × 10^-8) ≈ 7.20
pH = 14 - pOH ≈ 14 - 7.20 ≈ 6.80
The pH of a 0.40 M solution of K2SO3 is approximately 8.45.
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suggest why polonium-210 and astatine-211 are the isotopes of those elements with the longest half-lives.
Answers
Polonium-210 and astatine-211 are isotopes of their respective elements with the longest half-lives because they have a balanced number of protons and neutrons in their nuclei.
This balanced ratio of particles in the nucleus makes the isotopes more stable, and less likely to decay into other elements. Additionally, both polonium and astatine are relatively heavy elements, which makes it more difficult for them to decay through the emission of particles. Therefore, these isotopes have longer half-lives compared to other isotopes of the same elements. In both cases, the balance between the protons and neutrons in their nuclei provides relatively more stability compared to other isotopes of polonium and astatine. As a result, these isotopes undergo radioactive decay at a slower rate, leading to their longer half-lives. Therefore, these isotopes have longer half-lives compared to other isotopes of the same elements.
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Sometimes, all I think about is you
Late nights in the middle of June
Heat waves been faking me out
Can't make you happier now
Answers
Answer:
i dont know
Explanation:
⤵️
Explanation: here is my masterpiece