Baking cookies are what type
of change?

Chemical physical or thermal?

Answer: The empirical formula of one that contains 30.45% nitrogen is \(NO_{2}\).

Explanation:

Given: Mass of nitrogen = 30.45 g

Let us assume that the mass of given oxide is 100 grams.

As the atomic mass of nitrogen is 14.0067 g. So, moles of nitrogen will be calculated as follows.

\(Moles = \frac{mass}{molarmass}\\= \frac{30.45 g}{14.0067 g/mol}\\= 2.17 mol\)

Also, mass of oxygen = (100 - 30.45) g = 69.55 g

Atomic mass of oxygen is 15.9994 g/mol. So, moles of oxygen will be as follows.

\(Moles = \frac{mass}{molarmass}\\= \frac{69.55 g}{15.9994 g/mol}\\= 4.34 mol\)

The ratio of both the atoms is as follows.

\(\frac{4.34}{2.17} = 2\)

This means that gas has 2 moles of oxygen to 1 mole of nitrogen. Hence, the formula of oxide is \(NO_{2}\).

Thus, we can conclude that the empirical formula of one that contains 30.45% nitrogen is \(NO_{2}\).

The substances we start out with in a chemical reaction are called reactants, and the substances we end up with are called products.

A chemical reaction is a process where atoms are rearranged to form new substances.

The reactants are the initial substances that undergo the reaction, while the products are the resulting substances that are formed.

In a chemical equation, the reactants are usually written on the left-hand side of the arrow, while the products are written on the right-hand side.

Hence , reactants are the substances we start out with in a chemical reaction, and products are the substances we end up with.

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Answer:

True

Explanation:

Answer:  A. solid, compound

Explanation:

Because copper sulphate is a compound and it is a blue solid powder

Hope that help :)

On the basis of classification, electrolytic cells use non-spontaneous reactions which require an external power source in order to proceed.

On the other end, galvanic cells are spontaneous reaction, meaning it occurs with no outside intervention

A chemical change or reaction simply refers to a change which is not easily reversed and in which no new substance is formed.

So therefore, On the basis of classification, electrolytic cells use non-spontaneous reactions which require an external power source in order to proceed.

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In order to make a bulb light up, certain conditions need to be met. Firstly, there must be a closed circuit, meaning that there is a continuous flow of current through the circuit. This can be achieved by connecting the bulb to a power source, such as a battery or a generator, and completing the circuit with wires.

Secondly, the bulb must be connected properly to the circuit. This involves connecting the positive and negative terminals of the bulb to the corresponding terminals of the power source or the wires.

Finally, the bulb must have the correct voltage and wattage rating. Using a bulb with a higher or lower rating than the power source can cause the bulb to either not light up or burn out quickly.

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Answer:

Cu3PO4

Explanation:

There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, Cu\(_3\)PO\(_4\) is the formula for copper(I) phosphate(v).

Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.

An ionic compound is a metal and nonmetal combined compound.  Ionic compound are very hard. They have high melting and boiling point because of strong ion bond. Cu\(_3\)PO\(_4\) is the formula for copper(I) phosphate(v). Cu\(_3\)PO\(_4\) is an ionic compound with cation Cu⁺¹ and anion as PO₄³⁻.

Therefore, Cu\(_3\)PO\(_4\) is the formula for copper(I) phosphate(v).

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The ratio  of water molecules to calcium sulfate in hydrate is 1:4.08.

Hydrated molecules contain water of crystallization which can be easily removed by heating the hydrated molecules. The water of crystallization are lost on heating as they are loosely bound to the main moiety.

On strong heating of hydrated form of calcium sulfate, which is 7.534 g anhydrous calcium sulfate of 5.957 grams is obtained. From this data, mass of water molecules liberated is calculated as,

7.534 g -5.957 g=1.577 g

The ratio of water molecules to calcium sulfate  is obtained by dividing mass of water molecules by mass of hydrated calcium sulfate units, which is, 1.577:7.534=1:4.08

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3.6 ×10²⁴ atoms fluorine are in 410 g of UF\(_6\). Fluorine is an atomic number 9 chemical element with both the symbol F.

Fluorine is an atomic number 9 chemical element with both the symbol F. This is the smallest halogen as well as occurs as a very poisonous, pale yellow diatomic vapor under normal circumstances.

It is exceptionally reactive being the most electronegative active catalyst, reacting with all other elements save the light inert.

mole =  410 / 352.02 =1.16mole

number of atom= 1.16× 6.022×10²³=6.98×10²³

number of atom of fluorine =6× 6.98×10²³= 3.6   ×10²⁴ atoms

Therefore, 3.6 ×10²⁴ atoms fluorine are in 410 g of UF\(_6\).

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Answer:

Because they cannot be separated into more then one type of substance.

Explanation:

Answer:

Elements are made of only one kind of atom. The particles can be a single atom or a molecule made of only one kind of atom. There is no physical change that can separate elements into more than one kind of substance. This makes an element a pure substance.An element is made up of only one type of atom. An element cannot be broken down into a simpler form.

Answer:

temperature a measurement of the average amount of energy PER UNIT OF STUFF

Heat Energy is TOTAL ENERGY IN THE STUFF

So, that's why the difference. If you have two things at the same temperature, then any one mole (which is the same as how many molecules or atoms it takes to make up the molecular weight of something in grams.. so one mole of Hydrogen weighs 1 gram, 1 mole of helium weighs 2 grams, 1 mole of Gold weight 196 grams) of the stuff will have the same amount of energy as one mole of the other stuff. If you measure by total mass though, then you realize that there are more water molecules than gold ones in the same volume of stuff, and heat is about volume and molecular density, not mass.

This is why some Stirling engine folks who have made solar plants use Helium as the working gas.. it contains a huge amount of heat for its volume (also because it is very compressible)

So.. Delta Q goes with moles, not mass.

Comparative investigations involve a wide variety of factors and yield a lot of information. They may nonetheless show connections that do not always denote cause and effect.

When conducting a comparative inquiry, data are gathered on various things, features, or species as well as under various environmental factors, such as the season, temperature, and location.

Benefit – Practical uses are cheap, quick, and easily accessible

Limitation – Difficulty is observed when operationalizing variables

In a comparative investigation, a scientist compares similarities and differences throughout time and under diverse settings to look for trends.

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Based on the nature of chemical equilibrium, the system reached equilibrium first at the time T2.

Chemical equilibrium refers to the state of a reversible chemical reaction in which the rate of forward reaction for the the formation is equal to the rate of backward reaction for the formation of reactants.

In the table of the decomposition reaction given above, the system reached equilibrium first at the time T2 when the concentration of the reactant and products were the same.

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Answer:

T3

Explanation:

I've taken the test

It varies. A photon of that wavelength was released by the molecule if it was capable of doing so. A photon of that wavelength was absorbed by the molecule if it is capable of doing so.

The energy content, frequency, and location of a photon's wavelength on the electromagnetic spectrum are all characteristics. A photon's wavelength varies depending on its energy and can be as short as gamma rays (less than 0.01 nanometers), as long as X-rays (0.01 to 10 nanometers), as short as ultraviolet radiation (10 to 400 nanometers), as long as visible light (400 to 700 nanometers), as long as infrared radiation (700 nanometers to 1 millimetre), and as long as microwaves (1 millimetre - 1 meter).

A photon is a tiny, massless, energy-carrying component of light or other electromagnetic radiation. The smallest unit of light is a photon, which also serves as the building block for all other types of electromagnetic radiation, such as X-rays, gamma rays, infrared light, ultraviolet light, and visible light.

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Answer:

True

Explanation:

It is true because heat is released when a gas changes to a liquid.

Answer:

True

Explanation:just took the test

Answer:To be honest i dont know

Explanation:

e

Answer:

Explanation:

Alpha radiation ionizes the air. When smoke interaccts with the ionized particles it causes the alarm to sound.

Of the four solids, C(s, diamond) has the highest melting point because it is a covalent atomic solids that forms strong covalent bonds with each of its neighboring molecules.

Diamond is an allotrope of carbon with a covalent atomic structure, so it has the highest melting point among the given solids (C(s, diamond), Kr(s), NaCl(s), and H2O(s)). It is held together by a network of strong covalent bonds between the carbon atoms, which require a lot of energy to break. Therefore, it has the highest melting point.

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Answer:

98.8g (3 s.f.)

Explanation:

Use the mole = mass/mr equation to find the moles of CaO, then use the molar ratio to find the moles of Fe2O3, which is the same as CaO, (assuming the ratio is 1:1, as you haven't stated it clearly in the question). Then use the equation and input to find Mass, which is 98.8g to 3 s.f.

Answer:

B.

Explanation:

Glucose and oxygen.

No of moles:-

\(\\ \tt\longmapsto \dfrac{No\:of\:atoms}{Avagadro's\; number}\)

\(\\ \tt\longmapsto \dfrac{6.52(10^{24})}{6.022(10^{23})}\)

\(\\ \tt\longmapsto 10.82mol\)

Answer:

Carbon Monoxide.

Explanation:

I used to lol. Things didn't pop up well in a doctor's appointment and I had it explained to me.

The answer to the given question about strong acid  and weak acid is weak, strong, weak, strong.

Based on how strongly or weakly they ionize in water, acids are categorized as either strong or weak. An acid that is totally ionized in an aqueous solution is referred to be a strong acid. In water, hydrogen chloride (HCl) totally ionizes into hydrogen and chloride ions. An acid that ionizes very little in an aqueous solution is said to be weak. Acetic acid is a highly popular weak acid that can be found in vinegar. Acetic acid's incomplete ionization is indicated in the equation by the double arrow. Weak acids ionize to varying degrees, but often less than 10%. Since just 1.3% of the acetic acid in a 0.10M solution gets ionized, the equilibrium greatly favors the reactants.

Given That:

Acetic acid, pKa = 4.7

This above solution is Weak.

Nitric acid, pKa = -2

The above solution is strong.

Citric acid, pKa = 3.1

The above solution is weak

Sulfuric acid, pKa = -5

The above solution is strong.

Complete Question

Given the pKa of each acid, determine whether it is strong or weak.

acetic acid, pKa=4.7 ___

nitric acid, pKa=-2 ____

citric acid, pKa=3.1 ___

sulfuric acid, pKa=-5 ___

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The moles of oxygen which must be placed in a 3.00 L container to exert a pressure of 2.00 atm at 25.0°C is 0.249 moles of O₂. n = (2.00 atm × 3.00 L) / (0.08206 L atm mol^-1 K^-1 × 298K)n = 0.249 moles of O₂

Given variables:Pressure = 2.00 atm

Volume = 3.00

LT = 25°C = 298K

To find the moles of oxygen which must be placed in a 3.00 L container to exert a pressure of 2.00 atm at 25.0°C, we can use the Ideal gas law. The formula for the Ideal Gas Law is:

PV = nRT Where, P = pressure

V = volume T = temperature

n = moles

R = Universal Gas constant = 0.08206 L atm mol^-1 K^-1

Let's rearrange the formula, we get:

n = (PV) / RTWhere,

P = 2.00 atm V = 3.00

LR = 0.08206 L atm mol^-1 K^-1

T = 298K

Now, let's plug in the values in the above formula and solve for n:n = (2.00 atm × 3.00 L) / (0.08206 L atm mol^-1 K^-1 × 298K)Therefore, the moles of oxygen which must be placed in a 3.00 L container to exert a pressure of 2.00 atm at 25.0°C is 0.249 moles of O₂. Hence, the long answer is:n = (2.00 atm × 3.00 L) / (0.08206 L atm mol^-1 K^-1 × 298K)

n = 0.249 moles of O₂

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Answer:

It is either B or D, and I believe the answer is D.

Explanation:

Deepwater drilling relies on mud being pumped into the drill well for pressure purposes. Without the mud, gas and oil would just rise up uncontrollably because without counteracting the pressure from the sea and the rock, it would be spewing out. The mud helps the drill create the heavy column of downward force needed to maintain control of the output of gas and oil.

The answer choices that would best match the description would be B or D. Since the mud is there for provide pressure and downward force, I would go with choice D as my answer.

Answer:

Explanation:

To find the number of moles in a substance given it's number of entities we use the formula

\(n = \frac{N}{L} \\\)

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question we have

\(n = \frac{4.3 \times {10}^{27} }{6.02 \times {10}^{23} } \\ = 7142.857...\)

We have the final answer as

Hope this helps you

Answer: The pincushion moss, the echeveria, and the moon cactus in a terrarium make up a community.

:)

I think this is the answer btw Sorry if i'm wrong I have no clue.

In a terrarium, the pincushion moss, the echeveria, and the moon cactus make up the community.

Moon cactus, also known as Gymnocalycium mihanovichii or Hibotan cactus, is native to South American deserts in places like Brazil and Argentina.

Leucobryum glaucum, commonly known as leucobryum moss or pin cushion moss, is a species of haplolepideous mosses with a wide distribution in eastern North America and Europe.

Echeveria is a large genus of flowering plants in the family Crassulaceae, native to semi-desert areas of Central America, Mexico and northwestern South America.

Therefore, In a terrarium, the pincushion moss, the echeveria, and the moon cactus make up the community.

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