Which condensed structural formula represents an unsaturated compound?(1) CH3CHCHCH3 (3) CH3CH3
(2) CH3CH2CH3 (4) CH4

Answers

Answer 1

Answer: (1) CH3CHCHCH3.................

Answer 2

Answer:

(1) CH3CHCHCH3 because it contains a double bond.

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Determine the hydroxide ion concentration in
a solution that is 0.00043 M Ca(OH)2.

Answers

Answer: Ca(OH)2 = Ca2+ + 2 OH-

the ratio between Ca(OH)2 and OH- is 1 : 2

Explanation: [OH-]= 2 x 0.00034 = 0.00068 M

[H+]= Kw/[OH-]= 1.0 x 10^-14 / 0.00068 =1.5 x 10^-11 M ( at two significant figures)

HCl is a monoprotic acid

[H+]= 0.00031 M

[OH-]= Kw/[H+]= 1.0 x 10^-14 / 0.00031 =3.2 x 10^-11 M

[OH-]= 0.047 M

[H+]= 1.0 x 10^-14 / 0.047 =2.1 x 10^-13 M

The following image shows a chemical reaction taking place. what can you infer about this reaction

Answers

I don’t know didgswugeiwjbs

Answer:

Your answer is C

Explanation:

Hope This Helps

Classify the chemical equations as being balanced or not balanced

Answers

Answer: Two of them are balanced and two of them are unbalanced.

Explanation:

A balanced chemical equation is defined as the equation in which total number of individual atoms on the reactant side is equal to the total number of individual atoms on the product side. These equations follow law of conservation of mass.

An unbalanced chemical equation is defined as the equation in which total number of individual atoms on the reactant side is not equal to the total number of individual atoms on the product side. These equations does not follow law of conservation of mass.

For the given chemical equations:

Equation 1: $2CO+2NO\rightarrow 2CO_2+N_2$

As, number of carbon, nitrogen and oxygen atoms on the reactant side is equal to the number of carbon, nitrogen and oxygen atoms on the product side. Thus, this is a balanced chemical equation.

Equation 2: $6CO_2+6H_2O\rightarrow C_6H_(12)O_6+O_2$

As, number of oxygen atoms on the reactant side is not equal to the number of oxygen atoms on the product side. Thus, this is not a balanced chemical equation.

Equation 3: $H_2CO_3\rightarrow H_2O+CO_2$

As, number of carbon, nitrogen and oxygen atoms on the reactant side is equal to the number of carbon, nitrogen and oxygen atoms on the product side. Thus, this is a balanced chemical equation.

Equation 4: $2Cu+O_2\rightarrow CuO$

As, number of oxygen and copper atoms on the reactant side is not equal to the number of oxygen and copper atoms on the product side. Thus, this is not a balanced chemical equation

Hence, two of the equations are balanced and two are unbalanced.

1,2,4 are not balanced, 3 is balanced

Balance this chemical reaction H2+N2–> NH3

Answers

Answer:

3H2+N2-> 2NH3

Explanation:

This is the balanced chemical equation for the above reaction

a book with a mass of 1 kg is dropped from a height of 3 m. what is the potential energy of the book when it reaches the floor?

Answers

Well, first of all, the formula for finding potential energy is;
PE=mgh
Where; m is the mass
g is the gravitational force or acceleration due to gravity
h is the height.
Anyway, according to the question, the mass is 1kg, the acceleration due to gravity has a constant value of 10ms² . And the height is 3m. Now you just have to use all these in the formula. So;
mgh= 1 x 10 x 3. That will be 30. And the unit of potential energy is Joule. So the answer is 30 joules. Hope i helped. Have a nice day.

Final answer:

A book dropped from a certain height has no potential energy when it reaches the floor, since the height (a factor in the potential energy equation 'PE = mgh') becomes zero.

Explanation:

The potential energy of an object of mass (m) at height (h) is given by the formula PE = mgh, where g is the acceleration due to gravity (approximated as 9.8 m/s² on Earth). In this case, however, when a book reaches the floor after being dropped, its height is 0 meters, hence its potential energy is also 0 joules because potential energy is dependent on height.

Learn more about Potential Energy here:

brainly.com/question/24284560

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Please helpRadiocontrast dyes are considered safe because the isotopes have short half-lives and the isotopes coat the gastrointestinal tract and are not absorbed by normal tissue. If a patient ingests 10.0 mg of iodine, how long until the iodine-134 is 99% out of the patient's system if the half-life of iodine-134 is 52.6 minutes?

Answers

In 52.6 mins the 10 mg of iodine will be divided by its half-life which is 2 it will become 5 mg (in 52.6 minutes ) and same procedure will be followed until it reach 99% out of the patient's system.

The answer is 368 minutes will it takes the iodine to be absorbed in one's system.

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