CHEMISTRY HIGH SCHOOL

A gas absorbs 3.4 kJ of heat and does 1.9 kJ of work. Calculate ΔE

Answers

Answer 1
Answer:

Answer:

Answer is given below:

Explanation:

Given Data:

heat = 3.4kJ

work done is = 1.9 kJ

To Find:

ΔE=?

Formula:

ΔE = q + w

Solution:

ΔE = q + w

ΔE = 3.4 kJ + 1.9kJ

ΔE =  5.3 kJ

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The atomic number and mass number do not change during this type of radioactive decay.

Answers

In gamma decay, no change in proton number occurs, so the atom does not become a different element

What determines an element's chemical properties

Answers

An element's chemical properties are determined by the number ofelectrons .

How do  electrons determine chemical properties?

The number of electrons determine chemical properties of an atom as they are present in equal number outside the nucleus as that of protons .Protons contribute to the mass of an atom and give an identity to an atom .

As protons are positively charged there is a need to balance this positive charge and it is balanced by an equal number of electrons .As the valence electrons are the electrons which take part in chemicalreactions the element's chemical properties are determined  by the number of electrons.

The number of neutrons has a negligible effect on the chemical nature of elements as they are neutral and have no charge.Indirectly, it's the electronic configuration of an element which determines the chemical properties of any element.

To learn more about chemical properties of elements click here:

brainly.com/question/1935242

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The three factors determine the chemical properties of an element:
The number and arrangement of electrons in an atom
The number of valence electrons
The number and arrangement of electrons

Solve for y. -3/y+6=2

Answers

Answer: -7.5

Explanation: To solve for y in the equation -3/(y + 6) = 2, you can follow these steps:

First, we want to get rid of the fraction. To do that, multiply both sides of the equation by (y + 6) to cancel out the denominator:

-3/(y + 6) * (y + 6) = 2 * (y + 6)

This simplifies to:

-3 = 2(y + 6)

Now, distribute 2 on the right side of the equation:

-3 = 2y + 12

Next, isolate the term with 'y' by subtracting 12 from both sides of the equation:

-3 - 12 = 2y

-15 = 2y

Finally, divide both sides by 2 to solve for 'y':

-15/2 = y

So, the solution for y is:

y = -15/2

You can also express this as a mixed number:

y = -7.5

Define equivalent weight of an element​

Answers

Equivalent weight, in chemistry is referred to the quantity of a substance that exactly reacts with another substance in a particular reaction.

A buffer contains the weak acid HA and its conjugate base A-. the weak acid has a p Ka of 4.82 and the buffer has a pH of 4.25. Which statement is true of the relative concentration of the weak acid and its conjugate base in the buffer? a) [HA} > [A-]
b) [Ha} < [A-]
c) [HA]=[A-]

Answers

I think the correct answer is A. A buffer is a substance that resists small change in the acidity of a solution when an acid or base is added to the solution. Usually, a buffer involves a weak acid or a weak alkali and one of its salt.

Which condition causes a hurricane to rotate?

Answers

Answer:

its caused by the convection of air masses with differences in densities mainly due to their differences in temperatures.

-Hops
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