What is the mass of
6.45 x 1025 atoms Cu? The molar mass
of Cu is 63.55 g/mol.
A. 3.88 x 104⁹ g Cu
C. 107 g Cu
B. 0.593 g Cu
D. 6,810 g Cu

Answer:

the molecular formula = SF6

Explanation:

firstly we have to list the firmulas we r goin to use to work out the molecular formula.

now we use the 1st formula to find n which will be substituted into the molecular formula

We are going to take the mass we have been given in the question as the mass of the compound and substitute it to the formula.

Then we will work out the mass of empirical formula for the compound: Sulphur; 32 flourine;19 SF6_ 32+6(19)=146

now we finish off n

Lastly we work out the molecula formula

the final answer will therefore be SF6

BEcause

Explanation:

Sulfur (or sulphur in BrE) is a chemical element with the symbol S and atomic number 16. It is abundant, multivalent and nonmetallic.

If the reaction is first order with respect to x and second order with respect to y, the rate law can be written as rate = k[X]⁻¹[Y]⁻².

Starting with known concentrations of x and y in experiment 1, the initial rate of formation of z was measured. The initial rate of formation of z in experiment 2 would depend on the new concentrations of x and y. If the new concentrations are different from the initial concentrations used in experiment 1, the initial rate of formation of z in experiment 2 will also be different.

To determine the initial rate of formation of z in experiment 2, the rate law equation would need to be used with the new concentrations of x and y. The units of k, the rate constant, determine the units of the rate.

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--The given question is incomplete, the complete question is

"738; (1,45)(0.042 T Jath) 8518,314(308) 4 OO (3.O0)L85) Ttn (0.0821)(35.0) Enic snele Initial Rate of (Ylo Formation of (moLL- sec 0.101 9l 0.20 Experiment (Xlo 0.40 0.20 The table above shows the results from rate study of the reaction X+Y 2. Starting with known concentrations of X and Y in experiment 1,the rate of formation of Z was measured. If the reaction was first order with respect to( X and second order with respect t0_Y! the initial rate of formation of 2 experiment 2 would be (A) R (B) 2 Cx]" [Y]' 2R Y 1 = 2 1 4R."--

Conclusions about the hydrogen-bonding forces between each compound's molecules:

1. Fluoromethane \((CH_3F)\): Due to the polar covalent connection between the carbon and fluorine atoms, which generates partial positive and negative charges on the molecule, there would be hydrogen-bonding interactions between fluoromethane molecules.

2. N-chloromethylamine \((CH_3ClN)\): The existence of the N-H bond, which can create hydrogen bonds with other N-H or O-H groups, would result in hydrogen-bonding forces between molecules of N-chloromethylamine.

3. Methylamine \((CH_3NH_2)\): The existence of the N-H bond, which can create hydrogen bonds with other N-H or O-H groups, would result in hydrogen-bonding forces between molecules of methylamine.

4. Compound \(X_5\): It is not feasible to identify whether there would be hydrogen-bonding forces between the molecules of the compound or between the molecules of the compound and water without knowing more about the formula or structure of the chemical.

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The molarity of the barium chloride solution is 7.

What is molar mass?

The molar mass is the substance; it helps to determine the mass of the sample substance to the atom of the sample or substance. The molar mass depends on the molecular formula and the isotopes of the atom. Molar mass is used for the inducement of electric charge. Molar mass is the measurement of the volume of the mass. The molar mass is expressed in the unit of dalton.

What is mole ?

A mole is the atom's elementary particle, an ion. The mole of the substance is always related to the Avogadro number. The mole is always associated with the weight or mass of the element or substance. The standard unit of a mole is mol. The mole is a significant factor of the reactant and products to form an equation. A mole calculates the atom, ion, and substance weighs.

Therefore, The molarity of the barium chloride solution is 7.

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Answer:1. One is warm, the other cold

2. the cold one is smaller

Explanation: V/T is constant

if temperature decreases, volume decreases and vice versa

According to the concept of thermal energy, the balloon kept in refrigerator  has less volume while that is heated has more volume.

Thermal energy is defined as a type of energy which is contained within a system which is responsible for temperature rise.Heat is a type of thermal energy.It is concerned with the first law of thermodynamics.

Thermal energy arises from friction and drag.It includes the internal energy or enthalpy of a body of matter and radiation.It is related to internal energy and heat .It arises when a substance whose molecules or atoms are vibrating faster.

These vibrating molecules and atoms collide and as a result of which heat is generated in a substance , more the collision of particles , higher is the thermal energy.

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Answer:

A)

Explanation:

Unit Test Edg 2020

Sugar is a simple carbohydrate consisting of carbon, oxygen, and hydrogen molecules which are linked by covalent bonds.

The chemical covalent bonds are a type of chemical bond in which atoms that differ in their electronegativity share electrons to maintain cohesion i.e., intramolecular cohesion, while sugar molecules may interact by glycosidic bonds.

Therefore, with this data, we can see covalent bonds bind atoms in the sugar molecule while glycosidic bonds are those required to connect different sugar and thus form a complex macromolecule or polysaccharide.

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Answer:

Pulley

Explanation:

You can't the piano up the stairs, you need to something to bring it up

Answer:

whole milk ,table salt , maple syrup

Answer:

d

Explanation:

........false.........

The mass of methane (CH₄) which must be burned in order to liberate 12,880 kJ of heat is 231.9 g

A combustion reaction is a reaction in which a substance reacts with the oxygen and releases the energy in the form of light and heat.

Given data :

Heat energy liberated = 12,800 kJ

Δ Combustion = 891 kJ/mol

To calculate the mass of methane (CH₄) -

Number of moles of methane burned = Heat energy used

                                                                 Δ Combustion

Number of moles of methane burned = 12880

                                                                    891

Number of moles of methane burned = 14.455 mol

Since, Molar mass of methane is 16.043 g/mol

So, Mass of methane = Number of moles of x Molar mass of methane

                                          methane burned  

Mass of methane = 14.455 mol x 16.043 g/mol

Mass of methane = 231.9 g

Therefore, the mass of methane which must be burned is 231.9 g.

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Answer:

atoms and molecules

Explanation:

matter is made up of particles called atoms and molecules

Matter is made up of small molecules and attoms

a. cobalt. Vitamin B12, also known as cobalamin, contains the element cobalt.

Cobalt is an essential component of the structure of vitamin B12, which plays a crucial role in various physiological processes in the human body. It is involved in the formation of red blood cells, DNA synthesis, and the maintenance of the nervous system. Cobalt is necessary for the proper functioning of enzymes involved in these processes. While other elements like chromium, copper, zinc, and iron are also essential for human health, they are not directly associated with the structure or function of vitamin B12.

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The balanced redox reaction is :  6Hg(1) + Cr₂O₇²⁻ + 8H₂O + 16H⁺ + 6e⁻ → 3Hg₂⁺ + 2Cr .

To balance the redox reaction in basic solution:

Cr₂O₇²⁻ (aq) + Hg(1) → Hg²⁺ (aq) + Cr³⁺ (aq)

Step 1: Assign oxidation states to each element:

Cr₂O₇²⁻: Cr has an oxidation state of +6, and each oxygen atom has an oxidation state of -2. Therefore, the total oxidation state of Cr₂O₇²⁻ is 2 × (+6) + 7 × (-2) = +6 - 14 = -8.

Hg(1): Mercury in its elemental form has an oxidation state of 0.

Hg²⁺: The oxidation state of Hg²⁻ is +2.

Cr³⁺: The oxidation state of Cr³⁺ is +3.

Step 2: Separate the reaction into two half-reactions, oxidation, and reduction.

Oxidation half-reaction: Hg(1) → Hg²⁺

Reduction half-reaction: Cr₂O₇²⁻ → Cr³⁺

Step 3: Balance the atoms and charges in each half-reaction.

Oxidation half-reaction: Hg(1) → Hg²⁺

Since there is no charge on either side, the atom is already balanced.

Reduction half-reaction: Cr₂O₇²⁻ → Cr³⁺

There are two Cr atoms on the left side and one Cr atom on the right side, so we need to balance the Cr atoms by adding a coefficient of 2 in front of Cr³⁺

Cr₂O₇²⁻ → 2Cr³⁺

Step 4: Balance the oxygen atoms by adding water (H₂O) molecules to the side that needs them.

There are 14 oxygen atoms on the left side (in Cr₂O₇²⁻) and 6 oxygen atoms on the right side (in 2Cr³⁺). To balance the oxygen atoms, we need to add 8 water molecules (H₂O) to the right side.

Cr₂O₇²⁻ + 8H₂O → 2Cr³⁺ + 14OH⁻

Step 5: Balance the hydrogen atoms by adding hydrogen ions (H⁺) to the side that needs them.

There are 16 hydrogen atoms on the right side (in 14OH⁻ and 2Cr³⁺). To balance the hydrogen atoms, we need to add 16 hydrogen ions (H⁺) to the left side.

Cr₂O₇²⁻ + 8H₂O + 16H⁺ → 2Cr³⁺ + 14OH⁻

Step 6: Balance the charges by adding electrons (e⁻) to the side that needs them.

The total charge on the left side is -2 (from Cr₂O₇²⁻) and the total charge on the right side is 0 (from 2Cr³⁺ and 14OH⁻). To balance the charges, we need to add 6 electrons (e⁻) to the left side.

Cr₂O₇²⁻ + 8H₂O + 16H⁺ + 6e⁻ → 2Cr + 14OH⁻

Now, the oxidation and reduction half-reactions are balanced.

Step 7: Combine the two half-reactions.

To combine the half-reactions, we need to ensure that the number of electrons (e⁻) is equal on both sides. Multiply the oxidation half-reaction by 6 to balance the electrons.

6Hg(1) → 3Hg²⁺ + 6e⁻

Now, we can combine the two half-reactions:

6Hg(1) + Cr₂O₇²⁻ + 8H₂O + 16H⁺ + 6e⁻ → 3Hg²⁺ + 2Cr

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The food sample contained starch and reducing sugar (carbohydrates).

The Benedict's test is used to test for the presence of reducing sugars, such as glucose, in a sample. When the Benedict's solution is added to a sample containing reducing sugars and heated, the solution will turn brick red.

The iodine test is used to test for the presence of starch in a sample. When iodine solution is added to a sample containing starch, it will turn blue-black.

So, in this case, the student can conclude that the food sample contained both starch and reducing sugars, as both tests produced positive results.

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Answer:

The number of proton of magnisium = 12

Assimilation is the step of the carbon cycle when a plant absorbs carbon dioxide for photosynthesis

What is Carbon cycle?

It is the process where carbon compounds are interchanged among the biosphere, geosphere, pedosphere, hydrosphere, and atmosphere of the earth.

Steps of Carbon cycle

Following are major steps involved in the process of carbon cycle:

Carbon assimilation is process of incorporating carbon from atmospheric carbon dioxide into cell components.

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Answer:

Average Mass = 107.88 amu

Explanation:

We can calculate the average mass of an element by mutlpying the mass of its isotopes by their respective relative abundance and then making a total sum. Meaning that for this case:

Answer:

This question is incomplete

Explanation:

This question is incomplete but one can assume the answer from the definition of quantum mechanics. Quantum mechanics is the science that describes particles in nature at the atomic and subatomic particle (electron, proton and neutron) level. Thus it can be assumed that atoms and subatomic particles are used to broadly describe particles.

Answer:

It contained five kingdoms instead of two

Explanation:

Answer:

C <3

that the answer.

NF5 doesn't exist as it can't expand its octet.

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Net (positive) hydrostatic pressure tends to move fluid out of capillaries. the resulting bulk fluid movement is known as filtration

Filtration is a mechanical means of separating solids from a liquid suspension via a porous medium or screen that permits the liquid to pass while retaining the solids. Centrifugal filtration is driven by the pressure exerted by a liquid medium and is opposed by the combined resistance of the porous filter and filter cake.

Centrifugal filtration is a complex process that is dependent on a number of parameters including liquid viscosity, cake thickness, centrifugal force, screen area, and importantly, the size and packing characteristics of the particles themselves. This technique is generally not amenable to broad generalizations and is, therefore, best approached on a case by case basis.

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To calculate the solubility product constant (Ksp) of AgBr at 25°C, we can use the standard reduction potentials of the involved reactions.

The solubility product constant (Ksp) is a measure of the extent to which a solid compound dissolves in a solution. For AgBr, we can determine Ksp using the Nernst equation and the standard reduction potentials provided. The reduction potential for the reaction Ag+(aq) + e- → Ag(s) is +0.800 V, while the reduction potential for the reaction Br2(l) + 2 e- → 2 Br-(aq) is +1.066 V.

The balanced equation for the dissolution of AgBr can be derived from these reduction reactions as follows:

2 AgBr(s) → 2 Ag(s) + Br2(l)

To calculate Ksp, we need to consider the individual reduction potentials of AgBr and Ag+ in the equation. Since we have the reduction potentials for the reactions involving Ag+ and Br2, we need to reverse the sign of the reduction potential for Ag+(aq) + e- → Ag(s) to represent the oxidation reaction of Ag(s) → Ag+(aq) + e-. The overall reaction potential is the sum of the reduction potentials, which gives us +0.071 V + (-0.800 V) = -0.729 V.

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Answer:

The formula for salt is NaCl or Sodium chloride

Answer:

Dependent variable

Explanation:

In every experiment, there must be a dependent variable and an independent variable.

The independent variable is that variable that you have to manipulate in order to receive a response. E.g, in the experiment described in the question, the amount of sunlight a sunflower plant receives is the independent variable.

The dependent variable is the number of seeds produced. It is the response obtained by carefully manipulating the amount of sunlight

A disadvantage of disposing of waste polymers through recycling is that

they must first be separated.

Recycling is the process of forming new polymers and compounds as against their disposal .

Recycling involves separating the items into various sections such as paper,

plastic , metal etc. This is because they both undergo different recycling

processes.

The disadvantage of this process is that it's time consuming and also

expensive as a great amount of time and man power is needed to

separate the waste items.

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Answer:

Power

Explanation:

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