A 10.0 cm​ 3​sample of copper has a mass of 89.6 g. What is the density of copper?

Answer: ENERGY: A food chain is a linear sequence of organisms through which nutrients and energy pass as one organism eats another; the levels in the food chain are producers, primary consumers, higher-level consumers, and finally decomposers. These levels are used to describe ecosystem structure and dynamics.

MATTER: When one organism eats another, the matter, or carbon, nitrogen, and other essential elements, are transferred from one to the other. These elements move from the producers, to the consumers, and eventually to the decomposers, cycling the matter through the ecosystem.

Explanation: look up

Answer:

Chemical is best answer

Explanation:

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Please

Answer:

chemical is the  answer

Explanation:

Answer:

alchohol is an organic compound whose molecule consists of one or more than one hydroxyl groups bonded with a carbon atom.

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Answer:

It has the atomic mass of 12.

Answer:

Explanation:

From the given information:

mass of silver chloride AgCl = 11.89 g

molar mass of AgCl = 143.37 g/mol

We know that:

number of moles = mass/molar mass

∴

number of moles of AgCl = 11.89 g/ 143.37 g/mol

number of moles of AgCl = 0.0829 mol

The chemical equation for the mineral called trona is:

\(\mathsf{Na_2CO_3.NaHCO_3.2H_2O}\)

when being reacted with hydrochloric acid, we have:

\(\mathsf{Na_2CO_3.NaHCO_3.2H_2O + 3HCl \to 3NaCl + 2CO_2 +4H_2O}\)

One mole of NaCl formed from one mole of trona sample = 0.0829 moles of AgCl

i.e. 0.0829 moles of NaCl can be formed from AgCl

mass of trona sample = number of moles × molar mass

mass of trona sample = 0.0829 × 226

mass of trona sample = 18.735 g

The mass in the percentage of NaHCO₃ = mass of NaHCO₃/ mass of trona

The mass in the percentage of NaHCO₃ = 6.93/18.735

The mass in the percentage of NaHCO₃ = 0.36989

The mass in the percentage of NaHCO₃ = 36.99%

Nonetheless, a 6.78 g samples manufactured from sodium carbonate in pure 100%

∴

6.78 g sample manufactured from Na₂CO₃ is purer.

The phenomenon that best explains the miscibility of heptane in pentane is that both are non-polar compounds.

Solubility is defined as the ability of a solute or substance to dissolve in a given solvent and at a particular temperature.

Heptane is a straight-chain alkane hydrocarbon that contains 7 carbon atoms. It is a non polar solvent.

Pentane is also a straight-chain alkane hydrocarbon that contains 5 carbon atoms. It is also a non- polar solvent.

Both pentane and heptane are non-polar because the atoms in their molecules share electrons equally. They are able to dissolve each other because they are alike.

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Answer:

The similarities are the groups, triads law is a law where they are in groups or three, the octaves law is the 'best' law, is the one who every atom wants, they do everything to be in groups of eight.

Explanation:

Answer:

\(1 \: mole \: contains \: 6.02 \times {10}^{23} \: molecules \\ 3.7 \: moles \: contain \: (3.7 \times 6.02 \times {10}^{23} ) \\ = 2.23 \times {10}^{24} \: molecules\)

Colligative properties are properties that only depend on the concentration of solute molecules or ions, but will not depend on the identity of the solute. Some colligative properties are: Vapor pressure lowering, Boiling point elevation, etc. Therefore for our question, the best answer will be letter A, the number of the dissolved particles which can also be understood as the concentration.

Answer:

a) Molarity = 0.199M

b) 21.6L of solution

c) 0.199 moles of sucrose in 1L

Explanation:

a) Molarity is the ratio of moles of solute (sucrose) in volume of solution (3.30L):

Moles sucrose -Molar mass: 342,3g/mol-:

225.0g * (1mol / 342,2965g) = 0.6573 moles

Molarity = 0.6573 moles / 3.30L

b) 0.199M means 0.199 moles in 1L. 4.30 moles are in:

4.30 mol * (1L / 0.199mol) = 21.6L of solution

c) By definition, there are 0.199 moles of sucrose in 1L. This is the meaning of 0.199M

HOW TO CALCULATE MOLARITY:

QUESTION A:

QUESTION B:

QUESTION C:

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Answer:

2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)

General Formulas and Concepts:

Explanation:

Step 1: RxN

HNO₃ (aq) + Ca(OH)₂ (aq) → Ca(NO₃)₂ (aq) + H₂O (l)

Step 2: Balance RxN

2HNO₃ (aq) + Ca(OH)₂ (aq) → Ca(NO₃)₂ (aq) + 2H₂O (l)

Step 3: Ionic Equations

Total Ionic Equation:

2H⁺ (aq) + 2NO₃⁻ (aq) + Ca²⁺ (aq) + 2OH⁻ (aq) → Ca²⁺ (aq) + 2NO₃⁻ (aq) + 2H₂O (l)

Cancel out spectator ions.

Net Ionic Equation:

2H⁺ (aq) + 2OH⁻ (aq) → 2H₂O (l)

The mass of the excess reagent remaining after completion of reaction, given that 8 g of magnesium is heated with 8 g of phosphorous is 0.98 g

First, we shall obtain the mass of the excess reagent that reacted. This is shown below:

6Mg + P₄ -> 2Mg₃P₂

From the balanced equation above,

145.8 g of Mg reacted with 124 g of P₄

Therefore,

8 g of Mg will react with = (8 × 124) / 145.8 = 7.02 g of P₄

Finally, we shall obtain the mass of the excess reagent remaining after the reaction. Details below:

Mass of excess reagent, P₄ remaining = Mass given - mass reacted

= 8 - 7.02

= 0.98 g

Thus, the mass of the excess reagent remaining after the reaction is 0.98 g

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The combined Gas Law equation is represented by B) P1V1 / T1 = P2V2 / T2.

The combined gas law is the law that combines Charles’s law, Gay-Lussac’s law, and Boyle’s law.

Combined gas law can be mathematically expressed as

k = PV/T

Where,

P = pressure

T = temperature in kelvin

V = volume

K  = constant (units of energy divided by temperature)

When two substances are compared in two different conditions, the law can be stated as,

P1V1/T1 = P2V2/T2

Where,

P1 = initial pressure

V1 = initial volume

T1 = initial temperature

P2 = final pressure

V2= final volume

T2 = final temperature

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Answer:

Composition: All hydrocarbons are made up of only two types of atoms: carbon and hydrogen. They are like building blocks that contain carbon and hydrogen stuck together.

Organic Nature: Hydrocarbons are special because they are part of a group of compounds that come from living things or things that were once alive. They have carbon and hydrogen in them, which is what makes them different from other types of compounds.

Explanation:

Answer:

After checking many websites as well

I haven't seen any answer for this reaction

While I found answers or other reactions

Therefore I think this reaction cannot occur

Dropping an antacid tablet in a cup of water is a chemical change while boiling a cup of water for tea is just a physical change.

Physical changes have to do with the physical properties of substances. Such changes can be reversed.

Chemical changes, on the other hand, have to do with the chemical properties of substances and are usually irreversible when they occur.

Dropping an antacid in water with the formation of bubbles indicates that gas is evolved in the reaction. This means that a chemical reaction has occurred.

The bubble formed from boiling water is a result of increased entropy. Evaporated water can be retrieved by condensation.

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Answer:

the correct answers are A,D,E, and G

Explanation:

When 7.524 is rounded to 3 significant figures, it will be 7.52.

The process of changing a number to a nearby number with fewer significant digits is known as rounding.

Rounding can be done to the nearest integer, the nearest tenth, the nearest hundredth, and so on.

Here are some pointers on rounding numbers to a certain number of significant digits:If the digit following the last significant digit is less than 5, simply drop it and all following digits.

(round down)For example, 2.832 rounded to two significant digits is 2.8 since the 3 is followed by a 2 which is less than 5.

If the digit following the last significant digit is greater than 5, add 1 to the last significant digit, then drop all of the digits that follow it.

(round up)For example, 4.673 rounded to two significant digits is 4.7 since the 3 is followed by a 7 which is greater than 5.

If the digit following the last significant digit is exactly 5, the preceding digit is odd, and no other digits follow, increase the last significant digit by 1.

If the digit following the last significant digit is exactly 5, the preceding digit is even, and no other digits follow, simply leave the last significant digit alone.

For example, 2.875 rounded to two significant digits is 2.9 since the 5 is followed by an odd number, which means that the 8 should be rounded up, while 2.765 rounded to two significant digits is 2.8 since the 5 is followed by an even number, which means that the 6 should be left alone.

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Answer:

To determine the mass of NaHCO3 reacted in the reaction between sodium bicarbonate (NaHCO3) and hydrochloric acid (HCl), we can use the ideal gas law to relate the volume of CO2 generated to the number of moles of CO2. Then, by considering the stoichiometry of the balanced chemical equation, we can calculate the corresponding moles of NaHCO3.

First, let's convert the given conditions to SI units:

Volume of CO2 = 24.50 mL = 0.02450 L

Pressure = 660 torr = 660/760 atm (since 1 atm = 760 torr)

Temperature = 23.0°C = 23.0 + 273.15 K

Next, we can use the ideal gas law equation:

PV = nRT

Where:

P = Pressure in atm

V = Volume in liters

n = Number of moles

R = Ideal gas constant (0.0821 L·atm/(mol·K))

T = Temperature in Kelvin

Rearranging the equation, we have:

n = PV / RT

Now, let's calculate the number of moles of CO2:

P = 660/760 atm

V = 0.02450 L

R = 0.0821 L·atm/(mol·K)

T = 23.0 + 273.15 K

n = (660/760) * (0.02450) / (0.0821) * (23.0 + 273.15)

n ≈ 0.001117 mol (approximately)

From the balanced chemical equation, we know that the stoichiometric ratio between NaHCO3 and CO2 is 1:1. Therefore, the number of moles of NaHCO3 reacted is also approximately 0.001117 mol.

The molar mass of NaHCO3 is:

Na = 22.99 g/mol

H = 1.01 g/mol

C = 12.01 g/mol

O = 16.00 g/mol (x3)

Total molar mass = 22.99 + 1.01 + 12.01 + (16.00 * 3) = 84.01 g/mol

Finally, we can calculate the mass of NaHCO3:

Mass = n * molar mass

Mass = 0.001117 mol * 84.01 g/mol

Mass ≈ 0.0938 g

Therefore, approximately 0.0938 grams of NaHCO3 reacted in the given reaction

Answer:

Was is a hydrocarbon therefore when heated some co2 escapes but later solidifies

Explanation:

Hope it helps

when a chemical change is complete the reactant before the chemical reaction and the product after the chemical reactant will weigh same.

According to the law of mass of conservation : the mass in the chemical reaction is neither be created nor be destroyed. This means the the total mass of the reactant before the chemical reaction and the mass of the product after the reaction is same. we can say that atoms in the reactant side is equal to the atoms in the product side.

Thus, when a chemical change is complete the reactant before the chemical reaction and the product after the chemical reactant will weigh same.

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The helium sample will occupy a volume of 11.12 L if the pressure is reduced to 5.15 atm while maintaining the temperature at 20 °C.

The ability of monoprotic acids to donate one hydrogen atom or proton to their aqueous solution as opposed to diprotic acids to provide two hydrogen atoms or protons is the primary distinction between the two types of acids.

The pressure and volume of a gas are related by the following equation, known as Boyle's law:

P1V1 = P2V2

where P1 and V1 are the initial pressure and volume, and P2 and V2 are the final pressure and volume, respectively.

Using this equation, we can solve for V2:

P1V1 = P2V2

V2 = (P1V1) / P2

Plugging in the values given in the problem, we get:

V2 = (5.79 atm x 9.89 L) / 5.15 atm

V2 = 11.12 L

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Answer:

they cause animals home's to be destroyed

Explanation:

Answer:

From the given equation, we can see that for every 2 moles of Al, we get 3 moles of H2

So, we can say the the number of moles of H2 is 3/2 times the number of moles of Al

We are given the number of moles of Al and we have to find the number of moles of H2

We have deduced the relationship:

Moles of Al * 3 / 2 = Moles of H2

Replacing the variables with given values

3.5 * 3 / 2 = Moles of H2

Moles of H2 = 5.25 moles

The application of force in the direction of the motion of an object. The second scenario involves applying force to a moving item that is traveling in the opposite direction.

A force is an influence that has the power to alter an object's motion. An object with mass can change its velocity, or accelerate, as a result of a force. A force has both a direction and a magnitude.

Force is used to describe a body's tendency to modify or change its state as a result of an external cause. When force is applied, the body can also alter its size, shape, and direction.

A push or pull that an object experiences as a result of interacting with another item is known as a force. Every time two items interact, a force is exerted on each of the objects. The force is no longer felt by the two objects when the interaction ends.

Thus, Force applied to an item in motion that originates in any direction constitutes the third situation where force is created.

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Answer:

P2 = 3

Explanation:

u know that:

V1 = 2.0L

P1 = 1.5 atm

V2 = 1.0L

P2 = ?        (p1v1=p2v2)

1.5x2 = P2x1.0

3=P2x1.0    =>> 3.0 =P2

divided both side by 1.0 the remove 1.0 (left P2)

The pressure by decreasing the volume to 1 L will be  \(P_2=3 \ atm\)  

The given data is that

Volume    \(V_1=2 \ Litres\)

Pressure  \(P_1=1.5\ atm\)

When volume is reduced to

\(V_2=1\ liters\)

By using Boyles Law

\(P_1V_1=P_2V_2\)

\(P_2=\dfrac{P_1V_1}{V_2}\)

\(P_2=\dfrac{2\times 1.5}{1} =3 \ atm\)

Thus the pressure by decreasing the volume to 1 L will be  \(P_2=3 \ atm\)  

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ewhat grade is this

Explanation:

Answer:

The correct answer is 4

Explanation:

Boron trifluoride (BF₃) has a molecular geometry (as shown in the image in the question) referred to as trigonal planar; this is because each of the the fluorine atoms/molecules (bonded to the central boron atom) is placed in such a way that they form the three "end points"/"domains" of an equilateral triangle. Hence, the correct option is the last option.