How many molecules ?

Answer:

≈170.22 [gr].

Explanation:

1) M(Cu₂CO₃)=2*64+12+3*16=188 [gr/mol];

2) the part of copper in Cu₂CO₃ is:

[tex]\frac{64}{188} =\frac{16}{47};[/tex]

3) 16/47% of 500 [gr] is:

[tex]500*\frac{16}{47}=170.22[gr].[/tex]

Answer:

C. ribs.

Explanation:

The appendicular skeleton includes the shoulder girdles and arm bones, the pelvic gridle and the lower limb bones (leg bones). The ribs is part of the axial skeleton.

A model of a shopping centre is drawn to scale where 1 cm on the model represent 4 m on the ground. Music shop Thabo's Sports Ware Fati's Clothing shop Grocery store PARKING Coffee shop Toilets Restaurant Shoe store Physiotherapy Health and Fitness center 1.1 Which shop is on the right of the physiotherapy? (2) 1.2 Describe the position of the Coffee Shop in relation to the Toilets. (2)

Answer:

About 512 g.

Explanation:

We are given a sample of P₂Cl₅ that contains 179 grams of phosphorus, and we want to determine the grams of chlroine that is present.

Thus, we can convert from grams of phosphorus to moles of phosphorus, moles of phosphorus to moles of chlorine, and moles of chlorine to grams of chlorine.

From the formula, there are two moles of P for every five moles of Cl. The molecular weights of P and Cl are 30.97 g/mol and 35.45 g/mol, respectively. Hence:

[tex]\displaystyle 179\text{ g P} \cdot \frac{1\text{ mol P}}{30.97\text{ g P}} \cdot \frac{5\text{ mol Cl}}{2\text{ mol P}} \cdot \frac{35.45\text{ g Cl}}{1\text{ mol Cl}} = 512\text{ g Cl}[/tex]

In conclusion, there is about 512 grams of chlorine present in the sample.

Alternatively, we can mass percentages. The mass percent of phosphorus in P₂Cl₅ is:

[tex]\displaystyle \% \text{P} = \frac{2(30.97)}{5(35.45) + 2(30.97)} = 25.90\%[/tex]

Because there are 179 grams of phosphorus, the total amount of sample present is:

[tex]\displaystyle \begin{aligned} 25.90\% \cdot m_T & = 179\text{ g P} \\ \\ m_T & = 691.1 \text{ g}\end{aligned}[/tex]

Therefore, the amount of chlorine present is 691.1 g - 179 g, or about 512 g, in agreement with our above answer.

Answer:

B

Explanation:

specific heat capacity is the amount of Heat required to raise the temperature of a unit mass of substances by one degree

Answer:

Use energy sources that do not release greenhouse gases into the atmosphere.

Explanation:

If you use energy that does not release greenhouse gases such as CO2 then the heat won't be trapped in our environment, thus less chances of global warming. Option A is nonsense, B does not make sense either. C is the only valid way.

Answer:

True

Explanation:

I think it is common sense to assume that if we all came together to reduce our consumption then less resources would be harvested from envrionment and thus we would have positive impact on environment.

Answer:

As you go down a group on the periodic table, you get more electron shells and therefore a larger atomic radius.

The correct structure that corresponds to the name in the image above is structure A. Details about hydrocarbons can be found below.

Alkanes are organic compound that belongs to any acyclic saturated hydrocarbon e.g. methane, ethane, etc.

Alkanes have a single carbon bond and can be attached to by certain compounds. Methyl is a compound with the formula; CH3.

Therefore, the correct structure that corresponds to the name in the image above is structure A.

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Answer:

C

Explanation:

It was right on acellus

Answer: between 6.5 and 8.5

Explanation:

As shown in my science book it appears in the ph scale

The value of the equilibrium constant, Ke given the data from the question is 9.660

Equilibrium constant for a given is defined as the concentration of the products raised to their coefficient to the concentration of the reactants raised to their coefficient

For example:

eB <=> cD

The equilibrium constant for the reaction above is given as

Ke = [D]^c / [B]^e

The following data were obtained from the question:

The equilibrium constant for the reaction reaction can be obtained as follow

Ke = [C]² / [A][B]

Ke = [0.75]² / [0.232][0.251]

Ke = 9.660

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Atoms are the indivisible particles of matter. Atoms, molecular mass, and moles can be related by the Avogadros number. There are 2.00 × 10²⁵ atoms of neon in the sample.

The mass of the substance is the multiplication product of the moles and the molar mass.

We know, that 1 mole = 6.022 x 10²³ atoms

From the Avogadro's number, mass, and the molar mass the number of atoms is calculated as:

(6.022 x 10²³ atoms ÷ 1 mole Neon) × (1 mole Neon ÷ 20.18g) × ((6.73x10²)g Ne) = 2.00 × 10²⁵ atoms.

Therefore, 2.00 × 10²⁵ atoms of neon are present in the sample.

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Answer: water

Explanation:

In aqueous solutions, water is the solvent.

Answer:

change of color

Explanation:

One or more of the following events can indicate that a chemical reaction has occurred: The reaction flask's interior has undergone a color shift. A change in color and the appearance of bubbles are two indications of a chemical shift. The correct option is B.

A large variety of various observable characteristics, such as color change, energy change (temperature change or light produced), gas production, precipitate formation, and property change, can be used to detect chemical reactions.

An indicator is a chemical substance that modifies color when an acid or base is present. Indicators are often mildly acidic or basic in nature and originate from plant pigments.

Thus the correct option is B.

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Answer:

an increase in temperature

Explanation:

The chemical reaction that is produced by modelage masks causes: an increase in temperature

Answer:

Solvent

Explanation:

Solvent dissolves solute resulting in the formation of a solution.

Answer:

B) Solvent

Explanation:

In forming a solution, the substance which dissolves the solute is called the solvent.

[tex]\qquad\qquad\huge\underline{{\sf Answer}}[/tex]

The Correct choice is D. Fe + S = FeS

because, in nature Iron (Fe) and Sulphur (S) are found in mono - Atomic form. so, There will be 1 Fe atom reacting with 1 S atom to form FeS (Iron sulphide)

Answer:

Friction also prevents an object from starting to move, such as a shoe placed on a ramp. When friction acts between two surfaces that are moving over each other, some kinetic energy is transformed into heat energy.

Friction is involved in energy transformation considering the fact that When friction acts between two surfaces that are moving over each other, some kinetic energy is transformed into heat energy.

Friction also prevents an object from starting to move, such as a shoe placed on a ramp.

In other words, opposing force is known as friction. The type of friction that acts on an object that is not moving is static friction.

Static friction serves as a kind of friction that do occur between two object that are not moving which means the object are static in nature.

Thats why during rainy season while walking on slippery roads people wear shoes with spikes which prevents a person from slipping into mud by the action of friction.

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8.0 mol of lithium bromide

4 M solution of lithium bromide requires 4 moles of the compound per liter

8 ÷ 4 = 2

answer is 2 Liters

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Answer:

# 20 of Equilibrium

At 1500°C the system:

2NO(g)

N₂(g) + O₂(g) was allowed to come to equilibrium. The equilibrium concentrations were:

NO(g) = 0.0021 M; N₂ = O₂ = 0.239 M.

What is the value of Ke at this temperature?

Select one:

O a.

27.2

O b.

7.7 x 10-5

O c.

3.7 x 10-²

d.

1.3 x 104

O e. 8.8 x 10-3

Explanation:

# 20 of Equilibrium

At 1500°C the system:

2NO(g)

N₂(g) + O₂(g) was allowed to come to equilibrium. The equilibrium concentrations were:

NO(g) = 0.0021 M; N₂ = O₂ = 0.239 M.

What is the value of Ke at this temperature?

Select one:

O a.

27.2

O b.

7.7 x 10-5

O c.

3.7 x 10-²

d.

1.3 x 104

O e. 8.8 x 10-3

The result of 0.0030 x 8.65 to the correct number of significant figures is 0.02595. Details about multiplication can be found below.

Multiplication is the process of computing the sum of a number with itself a specified number of times, or any other analogous binary operation that combines other mathematical objects.

Multiplication as an operation increases a number.

According to this question, the following expression is given: 0.0030 x 8.65 = 0.02595

Therefore, the result of 0.0030 x 8.65 to the correct number of significant figures is 0.02595.

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Avogadro's law states that in every mole of a substance, there are [tex]6.022 \times 10^{23}[/tex] particles.

This means that in [tex]9.54 \times 10^{23}[/tex] molecules, there are [tex]\frac{9.54 \times 10^{23}}{6.022 \times 10^{23}}=\boxed{1.58 \text{ moles (to 3 sf)}}[/tex]

Answer:

176g

Explanation:

Given :

moles = 5.5

molar mass (sulfur ) = 32u

given mass = ?

Solution:

mole = given mass/molar mass

5.5 = given mass/ 32

5.5×32=given mass

176 g = given mass

[tex]\huge\underline\mathcal{\red{A}\blue{n}\pink{s}\purple{w}\orange{e}\green{r} -}[/tex]

We know that ,

[tex]Molarity \: (M) = \frac{no. \: of \: moles \: of \: solute }{volme \: of \: solution} \\[/tex]

it can be seen that we aren't provided with the no. of moles of solute in the question.

So let's calculate it using the given formula ~

[tex]no. \: of \: moles \: of \: solute = \frac{given \: mass}{molar \: mass} \\ \\ \longrightarrow \: \frac{50}{36.5} \\ \\ \longrightarrow \: 1.37 \: moles \: ( \: approx \: )[/tex]

Also ,

we're given that volume of solution = 500 mL = 0.5 L

Substituting the values in the formula of molarity , we get

[tex]Molarity = \frac{1.37}{0.5} \\ \\ \bold{\implies \: \boxed{Molarity = 2.74M}}[/tex]

hope helpful ~

From the calculation, Q >K, the reaction proceeds towards the left and more reactants will form.

The term equilibrium constant refers to the value that could indicate the extent of conversion of reactants to products.

Thus, given that the equilibrium constant for the reaction  A₂(g) + B₂(g) = 2AB(g) is 6.2, the Qc is obtained from;

Qc = [0.60]^2/[0.20] [0.15]

Qc = 0.36/0.03

Qc = 12

Since Q >K, the reaction proceeds towards the left and more reactants will form.

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The maximum amount, in grams, of Fe that would be produced during the experiment, will be 280 grams

From the equation of the reaction:

[tex]Fe_2O_3 + 2Al -- > 2Fe + Al_2O_3[/tex]

The mole ratio of [tex]Fe_2O_3[/tex] to Al is 1:2.

But 3 moles and 5 moles of reactants respectively started the reaction. Thus, Al is limited in availability and will determine the amount of products that will be produced.

The mole ratio of Al and Fe is 1:1, therefore, a maximum of 5 moles of Fe will be produced from the reaction.

5 moles Fe = 5 x 56 = 280 grams

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Answer:

In colorimetry, metamerism is a perceived matching of colors with different (nonmatching) spectral power distributions. Colors that match this way are called metamers.

Explanation:

In colorimetry, metamerism is a perceived matching of colors with different (nonmatching) spectral power distributions. Colors that match this way are called metamers.

examples

diethyl ether and methyl propyl ethers are metamers.