The amount of energy transferred by the wave in the pan is related to its
1. frequency
2. amplitude
3. frequency and amplitude

Answer: Percent yield represents the ratio between what is experimentally obtained and what is theoretically calculated, multiplied by 100%.

% yield

=

actual yield

theoretical yield

⋅

100

%

So, let's say you want to do an experiment in the lab. You want to measure how much water is produced when 12.0 g of glucose (

C

6

H

12

O

6

) is burned with enough oxygen.

C

6

H

12

O

6

+

6

O

2

→

6

C

O

2

+

6

H

2

O

Since you have a

1

:

6

mole ratio between glucose and water, you can determine how much water you would get by

12.0

g glucose

⋅

1 mole glucose

180.0 g

⋅

6 moles of water

1 mole glucose

⋅

18.0 g

1 mole water

=

7.20

g

This represents your theoretical yield. If the percent yield is 100%, the actual yield will be equal to the theoretical yield. However, after you do the experiment you discover that only 6.50 g of water were produced.

Since less than what was calculated was actually produced, it means that the reaction's percent yield must be smaller than 100%. This is confirmed by

% yield

=

6.50 g

7.20 g

⋅

100

%

=

90.3

%

You can backtrack from here and find out how much glucose reacted

65.0 g of water

⋅

1 mole

18.0 g

⋅

1 mole glucose

6 moles water

⋅

180.0 g

1 mole glucose

=

10.8

g

So not all the glucose reacted, which means that oxygen was not sufficient for the reaction - it acted as a limiting reagent.

Explanation:

Answer:

True

Explanation:

Answer:

See Explanation

Explanation:

Ionic compounds are composed of crystals. The crystal structure of an ionic compound is responsible for its hardness.

A crystalline solid contains a well organized structure which enables it to be hard and have a particular geometric shape as well defined melting point.

Hence, all the observed characteristics of NaCl are the result of its crystalline structure.

Explanation:

i colour code it so hopefully it make sense:)

Answer:

B. 87%

Explanation:

First, we calculate the molecular mass of magnesium bromide (MgBr2) as follows;

MgBr2 = 24.3 + 79.9(2)

= 184.1g/mol

Since 1 atom of bromine contains 79.9g, then the mass of two atoms of bromine (Br2) is 79.9 × 2 = 159.8g

Hence, the percentage of bromine (Br2) in MgBr2 is calculated as follows:

% mass of Br2 = mass of Br2/ molecular mass of MgBr2 × 100

% mass of bromine = 159.8/184.1 × 100

% mass of bromine = 0.8680 × 100

% mass of bromine = 86.8%

Approximately, % mass of bromine is 87%

Answer:

240 N/m

Explanation:

Using the formula as follows:

U = ½kx²

Where;

U = elastic potential energy (J)

K = spring constant (N/m)

x = stretched displacement (m)

According to the information provided in this question,

U = 35J

x = 0.54m

k = ?

U = ½kx²

35 = ½ × k × 0.54²

35 = ½ × k × 0.2916

35 = 0.2916k/2

70 = 0.2916k

k = 70 ÷ 0.2916

k = 240.05

To 2s.f, the spring constant (k) = 240 N/m.

Answer: 240

Explanation:

A molecular formula consists of the chemical symbols for the constituent elements followed by numeric subscripts describing the number of atoms of each element present in the molecule. The molecular formula for a compound can be the same as or a multiple of the compound's empirical formula.

I hope it seemed helpful to you!

Answer:

Molecular formulas describe the exact number and type of atoms in a single molecule of a compound. The constituent elements are represented by their chemical symbols, and the number of atoms of each element present in each molecule is shown as a subscript following that element’s symbol. The molecular formula expresses information about the proportions of atoms that constitute a particular chemical compound, using a single line of chemical element symbols and numbers. Sometimes it also includes other symbols, such as parentheses, dashes, brackets, and plus (+) and minus (–) signs.

Answer:

Yes it is reduced because ocl is the reducing agent

Explanation:

The molecules move more slowly and their average kinetic energy decreases

The molecules move more slowly and their average kinetic energy decreases. Hence, option B is correct.

On the molecular level, the individual chemical bonds in the substance are not altered; hence, a phase change is not a chemical reaction.

At the molecular level, the temperature is related to the random motions of the particles (atoms and molecules) in matter.

Because there are different types of motion, the particles' kinetic energy (energy of motion) can take different forms, and each form contributes to the total kinetic energy of the particles.

Hence, option B is correct.

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Answer:

D

Explanation:

because moles = mass /mr

so 81/18(mr of H2O=2+16)

moles =4.5

hope this helps:)

Answer:

If you wash your hands with soap, the soap molecules act as a link between the water you're washing with and the oil on your skin.

Explanation:

Answer:

1..CO3

2..OH

3..CO

4..Cl

5..PO3

6..SO4

8..NO3

9..NO2

1O..I2

Answer:

See explanation

Explanation:

Qualitative analysis in chemistry is a method used to determine the ions present in a solution chiefly by means of chemical reactions.

In this case, I suspect the presence of silver ions and/or barium ions. The first step is to add dilute HCl. This will lead to the precipitation of the silver ion as AgCl. If a white precipitate is formed upon addition of HCl then Ag^+ is present in the solution.

Secondly, I add a carbonate such as NH4CO3(aq). This will cause the barium ions to become precipitated as barium carbonate. Hence, the formation of a white precipitate when NH4CO3(aq) is added to the solution indicates the presence of barium ion in the solution.

Answer: exothermic

Explanation: chemical reactions that release energy is called exothermic, and in this case, more energy is being released. (I THINK)

The reaction shown in the picture is exothermic reaction.

The exothermic reaction leads to the release of energy. This energy is often higher than the combined energy of the reactants.

It can be understood that the net amount of energy required to initiate an exothermic reaction is less than the net amount of energy released by the reaction. When a calorimeter, a device used to measure the heat released by a chemical reaction, the net amount of heat energy that flows through the device is equal to the negative of the total energy change of the system.

In the picture, first reactants had high energy and after the formation of the product the energy decreases.

The nuclear fission of one atom of uranium-235 releases more than 2.5 million times the energy that is produced from the combustion of coal.

The fission of one atom can cause a chain reaction in which the neutron from the fission of one uranium-235 atom can strike another atom, leading to its nuclear fission.

Therefore, The reaction shown in the picture is exothermic reaction.

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Answer:

Công thức muối sắt là FeCl_3 nha bạn.

Answer:

To get the molarity we need to divide the number of moles of NaCl by the volume of the solution. So, 0.32 moles NaCl divided by 3.4 L, and that gives 0.094 M NaCl.

Answer:

3.02 Mm

Explanation:

Answer:

%K=38,6%  %N=13,86%   %O=47,54%

Explanation:

%K=M K/M KNO3

  =39/101

=38,6%

%N=14/101

=13.86%

%O=100%-%K-%N

=100-38,6-13,86

=47,54%

Answer:

Mass of copper in 200 g bronze is 120 g.

Explanation:

If it is known that bronze is formed with 60% copper and 40% tin, what will be the mass of copper contained in 200 grams of bronze?

Percentage of copper in bronze = 60 %

Percentage of tin in bronze = 40 %

Mass of bronze  = 200 grams

Mass of copper in bronze = 60 % of 200 g

= 0.6 x 200 = 120 grams

Mass of copper in 200 g bronze is 120 g.  

[tex]V_{1} = \text{5 L}[/tex]

[tex]T_{1} = \text{298 K}[/tex]

[tex]V_{2} = \text{3 L}[/tex]

[tex]T_{2}[/tex]

[tex]\dfrac{V_{1}}{T_{1}} = \dfrac{V_{2}}{T_{2}}[/tex]

[tex]T_{2} = T_{1} \times \dfrac{V_{2}}{V_{1}}[/tex]

[tex]T_{2} = \text{298 K} \times \dfrac{\text{3 L}}{\text{5 L}}[/tex]

[tex]\boxed{T_{2} = \text{179 K}}[/tex]

[tex]\\[/tex]

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Answer:

Salt

Explanation:

It is because it has a defined composition.

Answer:

Salt

Explanation:

Pure substances are those that contain atoms or molecules of the same type. For eg: elements are pure (gold, hydrogen etcl.) and compounds (such as water, sodium chloride, etc.), etc.

Rest of choice are impure because they contain a mixture of different things, like pie has eggs, or all sorts of other molecules, salt water has water and salt molecules, and iced tea has water and other molecules associated with tea.

Answer:

Global Warming , Volcanic Eruption

Answer:

4

Explanation:

C4H8

Answer:

d

Explanation:

As + O2 -------->as2o3

The number of reactants is less than the number of products in a decomposition reaction.

This is the type of chemical reaction which involves a reactant being broken down into two or more products.

This means the number of product is always greater than the reactant which is why option C was chosen.

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Answer:

ethyl methyl ether

Explanation:

when naming ethers name the alkyl rings, in this case we have methyl and ethyl( make sure they are in alphabetical order) followed by the word ether, so it becomes ethyl methyl ether

Answer:

C

Explanation:

because it is complete combustion so it will produced CO2 +H2O :)