6. How many aluminum atoms are there in 3.50 grams of Al₂O3?

The chemical formula for x and y is Cu₂O and CuO. The mass cooper which can react with 0.5g of oxygen to yield x and y is 2.745 g.

A chemical formula is a phrase that lists the constituent parts of a compound together with their relative quantities. No subscript is used if there is just one atom of a certain kind. A subscript is added to the symbol of an atom if it contains two or more of a certain type of atom.

1. 1.535 g of X → 1.365 g of Copper

1.535 – 1.365 = 0.170g of Oxygen

Atomic weight of Cu = 63.5,

Atomic weight of Oxygen = 16

For Cu 1.365 g / 63.5 = 0.02 mol

For Oxygen 0.170 g / 16 = 0.01 mol

X = Cu₂O

1.450 g of Y → 1.160 g of Cu

1.450 – 1.160 = 0.290 g of Oxygen

For Cu = 1.160 g / 63.5 = 0.018 mol

For Oxygen = 0.290 g / 16 = 0.018 mol

Y = CuO

2. The total mass of Oxygen = 0,170 g + 0,290 g

= 0.460 g

Total mass of Cu = 1.160 g + 1. 365 g

= 2.525 g

0.460 g of Oxygen → 2.525 g of Cu

0.500 g of Oxygen → (2.525 x 0.5) / 0.460

= 2.745 g of Cu

Thus, The law of multiple proportions was formulated by John Dalton in 1804.

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To calculate the molality (m) of a solution,

We will need to divide the number of moles of solute (n) by the mass of the solvent (in kg).

First, we will need to convert the mass of water from grams to kilograms:

mass of water = 3746 g = 3.746 kg

Next, calculate the number of moles of ethylene glycol:

moles of ethylene glycol = 3.20 moles

After finding the number of ethylene glycol, we will use the formula to calculate the molality:

m = moles of solute / mass of solvent (in kg)

m = 3.20 moles / 3.746 kg

Simplifying this calculation, we get:

m = 0.853 mol/kg

Therefore, the molality of the solution is 0.853 mol/kg.

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Answer:

received 2 electrons

Explanation:

Since a neutrally charged oxygen has 8 electrons (-) and 8 protons (+), an oxygen ion with a charge of -2 and would have 10 electrons.

Answer:

See explanation

Explanation:

PO4{3-} is phosphate
Sulfite's formula is SO3{2-}
Sulfate is SO4{2-}
OH- is hydroxide
Note: {x±} signifies the charge of the entire molecule

The polyatomic ions in question are phosphite ion, sulfite ion, and sulfate ion.

The formula PO3−4 represents the polyatomic ion called phosphite ion. It is composed of one phosphorus atom bonded to three oxygen atoms. The name of the sulfite ion is SO3−2, and it consists of one sulfur atom bonded to three oxygen atoms. Lastly, the sulfate ion has the formula SO4−2, and it is composed of one sulfur atom bonded to four oxygen atoms.

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Answer:

4.42 × 10⁻³⁷ m

Explanation:

Step 1: Given and required data

Step 2: Calculate the de Broglie wavelenght (λ) of the body

We will use de Broglie's equation.

λ = h / m × v

λ = (6.63 × 10⁻³⁴ J.s) / 1 kg × (1500 m/s) = 4.42 × 10⁻³⁷ m

Answer:

Explanation:

Which of the following is most likely to be ductile?

a. Metal
b. Nonmetal
c. Metalloid
d. Gas

Answer: a. MetalMetal

According to the given statement Na of the atoms listed below has the largest radius.

An atom is made up of a core nucleus and one or even more electrons with negative charges that orbit it. The positively charged, comparatively hefty protons and neutrons that make it up the nucleus may be present. The fundamental building components of matter are atoms.

Atoms are made up of a nucleus in the center that is surrounded by protons, neutrons, and electron. Uranium is divided into smaller atoms during the fission process, creating new atoms. The creation or atoms in enormous numbers can be seen in the Big Bang and Supernova phenomena.

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Answer:

Answer: A. The actual yield is the amount of product actually produced by a chemical reaction.

The actual yield is the amount of product actually produced by a chemical reaction. This statement is false. Therefore, the correct option is option A.

Chemists use the calculation percent yield to assess the effectiveness of chemical reactions. Every chemical reaction that they deal with has a predicted outcome. The great majority of the time, even with a desired outcome in mind that should occur chemically, this doesn't actually happen. The percent yield equation gives chemists an indication of how successfully the reaction actually went, as opposed to the best possible outcome they had anticipated.

The percent yield equation is useful for various purposes, such as finances, in addition to helping us understand chemical reactions better. The percent yield metric is used by businesses that produce chemical-based goods to assess their financial health and productivity. The actual yield is the amount of product actually produced by a chemical reaction. This statement is false.

Therefore, the correct option is option A.

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Answer:

.

Explanation:

Answer:

• General skeleton reaction:

• Balanced reduction half reaction:

• Balanced oxidation half reaction:

• Balanced net ionic equation:

• Full balanced redox reaction:

Explanation:

1st) It is necessary to write the skeleton reaction (unbalanced reaction):

In the reaction, copper (II) chloride react with aluminum to produce aluminum chloride and copper.

2nd) We need to know the oxidation number of each atom in the reaction, then we can find the element that oxidized and the element that id reduced:

Oxidation numbers:

+2 -1 0 +3 -1 0

With the oxidation number we can see that Al goes from 0 to +3, so the aluminum atom oxidizes. And, the copper atom goes from +2 to 0, so it is reduced.

3rd) To write the balanced reduction half reaction, it is necessary to balance all elements except oxygen and hydrogen (in this case, there is no oxygen or hydrogen atoms).

Then, it is important to balance the electrons in each half reaction, so in the Cu half reaction we have to multiply everything by 3:

4th) To write the balanced oxidation half reaction, we have to proceed like in the previous step:

We have to balance the electrons here too, but in this case we have to multiply by 2:

Note: Electron balance is done to cancel out the electrons in both reactions, so we need to have the same number of electrons on each side of the half reactions.

5th) Now, we can write the balanced net ionic equation, without the electrons:

6th) Finally, we can write the full balanced redox reaction, including the other elements, in this case Cl:

Answer:

B. Litmus paper

Explanation:

The test for chlorine can use either type of litmus paper, but blue litmus paper is used most commonly. The litmus paper must be damp - the water dissolves some of the chlorine so that it can react with the indicator on the litmus paper. This test shows that chlorine is a powerful bleach.

Answer:

71.5g

Explanation:

The reaction equation is given as:

               C  +  O₂  →  CO₂

Mass of C = 42g

Mass of O₂  = 52g

Unknown:

Mass of CO₂ produced  = ?

Solution

Now to solve this problem, we have to find limiting reactant which is the one given in short supply in this reaction.

 The extent of the reaction is controlled by this reactant.

Find the number of moles of the given species;

 Number of moles  = \(\frac{mass}{molar mass}\)

      Number of moles of C  = \(\frac{42}{12}\)   = 3.5mol

     Number of moles of O₂   = \(\frac{52}{32}\)   = 1.63mol

Now;

   From the balanced reaction equation;

           1 mole of C reacted with 1 mole of O₂

We see that C is in excess and O₂ is the limiting reactant.

            1 mole of O₂ will produce 1 mole of CO₂

 So;      1.63mole of O₂ will produce 1.63 mole of CO₂

Mass of CO₂ = number of moles x molar mass

       Molar mass of CO₂ = 44g/mol

Mass of CO₂ = 1.63 x 44 = 71.5g

Answer:

frequency = velocity of light /wavelength

wavelength = velocity / frequency

=3 x10^8 / 5.9 x 10^11

=0.508 x 10^-3.

Answer:

Explanation:

Here, we want to select 3 statements that are true about metalloids

Metalloids are the middle ground between metals and non-metals

They are not completely metals and also are not completely non-metals. They are in between the two kinds of elements

The correct choice of answers are the following:

a) They are somewhat reactive

b) This is incorrect because they are usually not malleable. An example is silicon

c) This is correct. They are popular for making semi-conductors

d) This is also correct. They are the bridge between metallic and non-metallic elements

In the following experiment, a coffee-cup calorimeter containing 100 mL of \(H_{ 2} O\) is used. The initial temperature of the calorimeter is 23.0 ∘C. If 6.60 g of \(CaCl_{2}\) is added to the calorimeter, Final temperature of the solution in the calorimeter = 11.

The first step in solving this problem is to calculate the number of moles of \(CaCl_{2}\\\) added to the calorimeter.

Moles of \(CaCl_{2}\) = mass of \(CaCl_{2}\) / molar mass of \(CaCl_{2}\)

Moles of\(CaCl_{2}\) = 6.60 g / 110.98 g/mol (molar mass of \(CaCl_{2}\)

Moles of\(CaCl_{2}\) = 0.0594 mol

We can use the equation for heat transfer to find the change in temperature of the solution. q = mCsΔT, where q is the heat transferred, m is the mass of the solution, Cs is the specific heat of the solution, and ΔT is the change in temperature.

We know that the initial temperature of the calorimeter is 23.0 ∘C and the mass of the solution is 100 g (since the density of water is 1 g/mL). We can solve for ΔT: ΔT = q / mCs

To find q, we can use the enthalpy change of solution (ΔHsoln) and the number of moles of\(CaCl_{2}\)added: q = ΔHsoln x moles of\(CaCl_{2}\)

q = -82.8 kJ/mol x 0.0594 mol

q = -4.92 kJ

Now we can solve for ΔT: ΔT = (-4.92 kJ) / (100 g x 4.184 J/g⋅∘C)

ΔT = -11.8 ∘C

We can find the final temperature of the solution by adding the change in temperature to the initial temperature: Final temperature = 23.0 ∘C - 11.8 ∘C =11 ∘C.

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Answer Van der Waals Forces

Explanation:

right on EDGE 2021

Gecko's feet easily adhere to the wall and floor by the Van der Waals forces of attraction between the surface and its feet. Thus option d is correct.

Van der Waals force is a kind of intermolecular attractive force between two particles which is comparatively weaker than other forces like dipole force, covalent and ionic force.

Because of the minute hair-like projections on the underside of their feet, geckos are renowned for being skilled climbers. Studies revealing that they are coated with an ultra-thin layer of lipid molecules in an upright orientation.

Each of those minuscule hairs, known as setae, breaks off into hundreds of even smaller bristles, or spatulae. It has long been understood that the so-called van der Waals forces, or the attractive and repulsive forces between two dipole molecules, become important at microscopic size scales.

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Answer:

The correct answer is - A. 12.5 gram.

Explanation:

Given:

The initial amount of sample = 400 gram

the half-life cycle = 3 days

after 15 days remain value = ?

Solution:

The number of half-lives in 15 days = 15/3

= 5 half-lives

the remaining amount of sample after one half-life 3 days = 400/2 = 200

the remaining amount of sample after 2nd half-life or 6 days= 200/2 = 100

the remaining amount of sample after 3rd half-life or 9 days= 100/2 = 50

the remaining amount of sample after 4th half-life or 12 days= 50/2 = 25

the remaining amount of sample after 5th half-life or 15 days= 25/2 = 12.5 gram

Thus, the correct answer is = 12.5 g.

By analyzing the potential energy diagrams and calculating ΔH using bond energies, we can determine whether a reaction is exothermic (ΔH < 0) or endothermic (ΔH > 0).

To create potential energy diagrams for chemical reactions and determine the value of ΔH (the change in enthalpy) for each reaction, we need to understand the basic concepts and steps involved.

Potential Energy Diagram: A potential energy diagram is a graphical representation of the energy changes that occur during a chemical reaction. The vertical axis represents the potential energy, while the horizontal axis represents the progress of the reaction.

Reactants and Products: Identify the reactants and products involved in each reaction. Assign them appropriate labels on the potential energy diagram.

Activation Energy: Determine the activation energy (Ea) for each reaction. It represents the energy barrier that must be overcome for the reaction to occur. On the diagram, the reactants' energy level is typically higher than the products' energy level, with the activation energy peak in between.

Transition State: Locate the highest point on the potential energy diagram, which represents the transition state or activated complex. This point indicates the highest energy level during the reaction.

ΔH Determination: ΔH represents the difference in enthalpy between the reactants and products. It can be determined by examining the vertical distance between the reactants' energy level and the products' energy level on the potential energy diagram.

ΔH Calculation: ΔH can be calculated using the formula ΔH = Σ (bond energies of reactants) - Σ (bond energies of products). The bond energies are the energy required to break a particular bond or released when a bond is formed.

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We must identify the limiting reactant and use that information to compute the maximum amount of hydrofluoric acid that can be produced in order to provide answers to these questions. Calculating the quantity of extra reactant left behind after the reaction is finished is also necessary.

A limiting reagent is a reactant in a chemical reaction that controls how much product is created, according to the definition of the term. Because the reactions between the elements and compounds in a balanced chemical equation depend on their mole ratios, the use of a limiting reactant is necessary.

A substance that takes part in a chemical reaction is known as a limiting reactant. It establishes the maximum product amount that

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The force applied to the rocket by its engines remains constant as it moves up, while its mass decreases, resulting in an increase in acceleration.

Newton's laws of motion provide an explanation for the acceleration of a rocket as it moves away from the ground. According to Newton's second law, the force exerted on an object is directly proportional to its acceleration, and the force required to move an object increases as its mass increases.

In the case of a rocket, its mass decreases as it consumes fuel, which means that less force is required to move it as it climbs higher into the atmosphere.

As the rocket moves up, its acceleration increases while the force exerted on it remains constant. Newton's second law of motion explains that the acceleration of an object is directly proportional to the force applied to it. According to the second law of motion, an object's acceleration is equal to the force exerted on it divided by its mass.

This means that as the rocket climbs higher and its mass decreases due to the consumption of fuel, less force is required to accelerate it, and so its acceleration increases. In other words, the rocket's acceleration is increasing because the force required to move it is decreasing due to the decreasing mass of the rocket.

This phenomenon is also related to Newton's third law of motion, which states that every action has an equal and opposite reaction. The force exerted by the rocket's engines is balanced by an equal and opposite force exerted on the rocket by the exhaust gases, according to this law.

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Answer:

The answer is one

Explanation:

I will just type any rubbish here bcuz my answer should be more than 20 words..... Just know the answer is 1

Answer:1=B

2=A

Explanation:

Answer:

76 ml

0.076 L

Explanation:

hope that helps

Answer:

76 for the first one at least I think

Answer:

40.kPa hope this helps....

The society with the least negative effects on the environment is probably the one with a small population, traditional farming methods, no access to contemporary technology, and self-sufficient food production.

This is due to the fact that their way of living is less dependent on modern infrastructure and technology, both of which have a negative impact on the environment. Additionally, their agricultural methods are probably more environmentally friendly and sustainable.

The environmental effects of the other societies on the list would all be greater. Because of the use of fossil fuels and the production of products that require a lot of resources, a big, industrialized society with high levels of consumption would have a significant carbon footprint.

It would still take a lot of resources to maintain its infrastructure and create products in a less populous, highly industrialized society with moderate consumption levels, which would have a negative effect on the environment.

Given that the size of the population alone would necessitate significant resource consumption and infrastructure development, a big population with moderate industrialization and consumption levels would also have a big effect on the environment.

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Answer:

D The number of protons

Answer:

33.3 moles of NaCI = 1946.144241 grams

Explanation:

SORRY THIS IS SO LATE YOU PROBABLY GOT IT ALREADY BUT ANYWAY I HOPE YOU HAVE AN AMAZING DAY AND GOOD BYE

Answer:

1946.144241

Explanation: I searched it up it is correct