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3 years ago

How do i know if a reaction is exo/endothermic?? help please.

Chemistry

1 answer:

goblinko [34]3 years ago

3 0

Answer:

Explanation: in exothermic reaction heat is released out

In endothermic reaction heat is absorbed

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Write equations to show whether the solubility of either of the following is affected by pH:(a) CuBr;

V125BC [204]

Increasing pH will increase the solubility of the CuBr.

What is the solubility of water?

When a solute is dissolved in a solvent to give a homogeneous mixture, one has a solution.
Solubility is generally expressed as the number of grams of solute in one liter of saturated solution.
For example, solubility in water might be reported as 12 g/L at 25 oC.

2CuBr + 2OH- ---> Cu2O(s) + 2HBr(aq)

adding OH- to the CuBr also shifts the equilibrium to the right side therefore increasing pH will increase the solubility of the CuBr.

Learn more about solubility

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2 years ago

Assessment

MakcuM [25]

i didn’t mean to put this opps

4 0

3 years ago

What are the representative elements usually called

antiseptic1488 [7]

Answer:

There are two sets of groups in the periodic table. The first set are Group A elements and are also known as representative elements. The second set are Group B elements and are also known as transition metals. Representative elements are the most abundant elements on earth.

4 0

3 years ago

What is the mass of 3.77mol of K3N?

AleksAgata [21]

<h3>Answer:</h3>

495 g K₃N

<h3>General Formulas and Concepts:</h3>

Math

Pre-Algebra

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right

Chemistry

Atomic Structure

Reading a Periodic Table

Stoichiometry

Using Dimensional Analysis

<h3>Explanation:</h3>

Step 1: Define

3.77 mol K₃N

Step 2: Identify Conversions

Molar Mass of K - 39.10 g/mol

Molar Mass of N - 14.01 g/mol

Molar Mass of K₃N - 3(39.10) + 14.01 = 131.31 g/mol

Step 3: Convert

Set up: $\displaystyle 3.77 \ mol \ K_3N(\frac{131.31 \ g \ K_3N}{1 \ mol \ K_3N})$
Multiply/Divide: $\displaystyle 495.039 \ g \ K_3N$

Step 4: Check

Follow sig fig rules and round. We are given 3 sig figs.

495.039 g K₃N ≈ 495 g K₃N

5 0

3 years ago

Movement of electrons about a central nucleus is a concept by whom?

Alenkasestr [34]

The answer is bohr hope this helps :)

5 0

3 years ago

Read 2 more answers