How many moles is 78.0 grams of sodium?

Answer:

oxygen are covalent bonds because they require 2 more electrons to obtain their octet shell

so when they combine with any other element, they form a covalent bond

Explanation:

Oxygen requires two shared electrons to fill its outermost shell therefore to covalent bonds form.

Frequency – The frequency of a wave is the number of waves that pass a given point in a certain amount of time. Frequency is measured in units called hertz (Hz), and is defined as the number of waves per second. A wave that occurs every second has a frequency of 1 wave per second (1/s) or 1 Hz.

Answer:

Na2SO4

2×23 + 32 + 4×16

46 + 32 +64

=142g

When tiny droplets of one liquid are finely dispersed within another liquid it is called emulsion.

Emulsion can be defined as the process by which two liquids that are not miscible come together to form a mixture.

The emulsion mixture usually consists of an oil phase and a water phase.

The oil phase appears as droplets when dispersed (mixed with) the water phase.

The uses of emulsion include:

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Patients with hyperparathyroidism would be at risk for developing renal calculi because of high calcium levels excreted by the kidney.

Hyperparathyroidism occurs when there is over secretion of parathyroid hormone by the parathyroid glands.

The parathyroid hormone is responsible for the following in the body:

Renal calculi are strong masses of stones deposited in the kidneys or urinary bladder.

When there is excess calcium in the blood due to hyperparathyroidism, the kidneys would be over burdened with the excretion of excess calcium.

That extra calcium in the kidney & the urine leads to kidney stone development ( renal calculi).

Therefore, patients with hyperparathyroidism would be at risk for developing renal calculi because of high calcium levels excreted by the kidney.

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A metal electrode composed of  strong reducing agent will have a greater

electrical potential to push electrons toward the electrode composed of a

weak reducing agent.

Strong reducing agents are compounds which donates or loses electrons

with a corresponding increase in the oxidation state. Weak reducing agents

can also be referred to as oxidizing agents and they accept the electrons

from the strong reducing agents which results in a reduction in the oxidation

state.

The strong reducing agent has a greater electric potential which aids the

electrons being pushed towards the electrodes with a weak reducing agent.

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Answer:

Soap is an excellent cleanser because of its ability to act as an emulsifying agent. An emulsifier is capable of dispersing one liquid into another immiscible liquid. This means that while oil (which attracts dirt) doesn't naturally mix with water, soap can suspend oil/dirt in such a way that it can be removed.

Soap acts as a cleaner because of its ability to act as an emulsifying agent. A soap molecule has a polar head and a nonpolar tail. Soap consists of a carbon chain where one end attracts oil and the other attracts water.  

Most of dirt can be described as oily in nature as oil does not dissolve in water. The molecule of soap consists of sodium salts of long-chain carboxylic acids. In soaps, the chain of carbon atoms dissolves in the oil, and the ionic or polar end of the soap molecule dissolves in water.

The soap molecules produce structures known as micelles. In micelles, one end faces the oil droplet, and the other end which is ionic in nature faces outside. Therefore, soap can form an emulsion in water and supports in dissolving the dirt when we wash our clothes.

Soap can be described as a kind of molecule in which both ends have different properties. The hydrophilic end dissolves water and is attracted to it whereas the hydrophobic end is dissolved in hydrocarbons and is water repulsive in nature.

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Answer:

Synthesis

Explanation:

Trust me on this :)

When a substance dissolves, it looks like it disappears. But in fact it has just mixed with the water to make a transparent (see-through) liquid called a solution. A solution has two parts. The solute is the solid that gets dissolved.

Answer:

it really depends what they are

Explanation:

Answer:

Explanation:

NASA uses rockets to launch astronauts and supplies to the International Space Station. Launching a rocket relies on Newton's Third Law of Motion. A rocket engine produces thrust through action and reaction. The engine produces hot exhaust gases which flow out of the back of the engine

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Answer:

Amino acids are molecules that combine to form proteins.

Explanation:

Amino acids are molecules that combine to form proteins. Amino acids and proteins are the building blocks of life. When proteins are digested or broken down, amino acids are left. The human body uses amino acids to make proteins to help the body: ... Repair body tissue.

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Answer:

CaSe

Explanation:

not sure!!

Answer:

True

ANTI MEANS AGAINST

Explanation:

This problem provides information about the decomposition of copper(II) nitrate to copper(II) oxide and dinitrogen monoxide; for example, it is endothermic, the enthalpies of formation and the chemical reaction, as well as copper (II) sulfate which when dissolved in water, exhibits a temperature decrease:

[tex]2Cu(NO_3)_2(s) \rightarrow 2CuO(s) + 4NO_2(g) + O_2(g)[/tex]

First of all, we can draw the reaction pathway as shown on the attached figure, by taking into account the positive enthalpy change as it is endothermic, so that the products turn out with higher energy than the reactants, for it to be positive. In addition, keep in mind that top point is the activation energy the reaction needs to take place.

Next, we calculate the enthalpy change for this reaction by using the general formula which subtracts the enthalpy of formation of products and reactants with each species' correct stoichiometric coefficient:

[tex]\Delta H=2\Delta _fH_{CuO}+4\Delta _fH_{NO_2}+\Delta _fH_{O_2}-2\Delta _fH_{Cu(NO_3)_2}[/tex]

So we plug in the given enthalpies of formation:

[tex]\Delta H=2(-157.3)+4(33.2)+(0)-2(-302.9)=424.0 kJ/mol[/tex]

Finally, we go over the calorimetry experiment, whereby the total heat absorbed by the copper(II) sulfate is calculated via the general heat equation, which includes the heat loss from the solution of water and the salt:

[tex]Q_{rxn}=-mC_w\Delta T\\\\Q_{rxn}=-(100+25)g*4.18\frac{J}{g\°C}*-2.9\°C=1515.25J[/tex]

By dividing the previous answer by the moles of salt:

[tex]n=25.0g*\frac{1mol}{249.7g}=0.100mol[/tex]

We can obtain the enthalpy change of solution of the copper salt:

[tex]\Delta _{dissolution}H=\frac{1,515.25J}{0.100mol} \\\\\Delta _{dissolution}H=15,134J/mol=15.1kJ/mol[/tex]

To conclude, it is important to note that one possible source of error is we are assuming the solution has the same specific heat to that of water and that is not necessarily true. Also, we are neglecting any heat transfer to and from the surroundings despite the polystyrene beaker is considered a heat isolator, which means the results cannot necesarilly be accurate and the enthalpy change could have turned out higher or lower in a rigoruous experiment.

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Answer:

the difference is  the presence of a carbon atom

Explanation:

Answer: 82.0 g/mole

Explanation:

Use the units to see that if we divide 1.64 grams by 0.0200 moles, we'll get a number that is grams/mole, the definition of formula mass.

1.64/0.0200 = 82.0 g/mole (3 sig figs)

We can't tell from this alone what the molecular formula might be, but C6H10 (cyclohexene) comes close (82.1 grams/mole).

The formula mass of the compound will be approximately 82.0 g/mol

The formula mass of the compound is the sum of atomic masses of all the atoms in its chemical formula. It is calculated by adding up the atomic masses of the individual elements in the compound, each multiplied by the subscript indicating the number of atoms of that element in the formula.

To find the formula mass of the compound, we'll use the relationship between moles, mass, and molar mass.

Molar mass (in g/mol) = Mass (in g)/Moles

Given:

Mass = 1.64 g

Moles = 0.0200 moles

Let's plug the values and calculate molar mass:

Molar mass = 1.64 g / 0.0200 moles

Molar mass ≈ 82.0 g/mol

The formula mass of the compound is approximately 82.0 g/mol, rounded to three significant figures.

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Answer:

An ion is a charged atom or molecule. It is charged because the number of electrons do not equal the number of protons in the atom or molecule. An atom can acquire a positive charge or a negative charge depending on whether the number of electrons in an atom is greater or less then the number of protons in the atom.

    This is not exactly a answer you can use but this is some information that you can use to find out the answer.

    You can usually confirm the charge associate degree particle unremarkably has by the element's position on the periodic table: The alkali metals (the IA elements) lose one negatron to create a ion with a 1+ charge. The alkaline-earth metal metals (IIA elements) lose 2 electrons to create a 2+ ion.

    Nonmetals type negative ions (anions). A range 7|chemical element|element|gas} atom should gain 3 electrons to possess an equivalent number of electrons as AN atom of the subsequent gas, neon. Thus, a gas atom can type AN ion with 3 additional electrons than protons and a charge of 3−.

Answer:

96mg

Explanation:

Since the half-life of Palladium-100 is 4 days and the sample has been reduced after 16 days, that means the sample has undergone four half-lives. To find the intial mass, just work backwards:

As you see, I've worked backwards from the four half-lives. So the initial mass after 16 days is 96 mg.

Mr. garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is iron.

The chemical element iron has the atomic number 26 and the symbol Fe. It is a metal that is found in group 8 of a periodic table and the first transition series. It makes up a large portion of the planet's outer or inner core and is the most prevalent element on Earth by mass, just ahead of oxygen.

It is the fourth most prevalent element in the crust of the Earth, having been mostly deposited by meteorites inside its metallic state, along with its ores. Iron ores must be processed in kilns or furnaces that may reach 5000 °C (2,730 °F) and higher, which is approximately 500 °C (932 °F) greater than the temperature needed to smelt copper. Mr. garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is iron.

Therefore, mr. garcia uses magnets to hold a poster on a steel filing cabinet because a main component of steel is iron.

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Answer:

It’s sodium chloride

Explanation:

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Answer:

The warmer the water gets the particles begin to expand and starts vibrating

Answer:

Each element within a group has similar physical or chemical properties because of its atom's outermost electron shell (most chemical properties are dominated by the orbital location of the outermost electron).

Explanation:

Answer:(8.5d) A compound has a formula Mg:(PO.). Which best describes the atoms that make up this compound? A. B. Atom Magnesium (Mg) phosphorus (0) Oxygen (0)

Explanation:

Answer:

Gravitational potential energy - into Kinetic energy

Explanation:

Answer:

Co2(CO3)3

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Answer:

B. Biosphere

Explanation: