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3 years ago

Why is dissolving salt in water is a physical change? Help me please

Chemistry

2 answers:

svlad2 [7]3 years ago

7 0

it is a great change because the salt goes in and turn the water to salt water

xxMikexx [17]3 years ago

6 0

Because the salt was salty to the water and hI e water got mad

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How many moles in 4.93 x 10E23 atoms of silver?

leva [86]

<h3>Answer:</h3>

0.819 mol Ag

<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

Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

Stoichiometry

Using Dimensional Analysis

<h3>Explanation:</h3>

Step 1: Define

4.93 × 10²³ atoms Ag

Step 2: Identify Conversions

Avogadro's Number

Step 3: Convert

Set up: $\displaystyle 4.93 \cdot 10^{23} \ atoms \ Ag(\frac{1 \ mol \ Ag}{6.022 \cdot 10^{23} \ atoms \ Ag})$
Divide: $\displaystyle 0.818665 \ mol \ Ag$

Step 4: Check

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

0.818665 mol Ag ≈ 0.819 mol Ag

8 0

3 years ago

A redox reaction can also be a?

AveGali [126]

Losing eltron is the answer

7 0

3 years ago

1. In the first step of the mechanism for this process, a phenoxide anion is generated. This phenoxide anion goes on to act as a

Tju [1.3M]

Answer:

See the explanation

Explanation:

In this case, in order to get an elimination reaction we need to have a strong base. In this case, the base is the phenoxide ion produced the phenol (see figure 1).

Due to the resonance, we will have a more stable anion therefore we will have a less strong base because the negative charge is moving around the molecule (see figure 2).

Finally, the phenoxide will attack the primary carbon attached to the Cl. The C-Cl bond would be broken and the C-O would be produced at the same time to get a substitution (see figure 1).

3 0

4 years ago

2 Upper P Upper O Upper C l Subscript 3 Baseline (g) + heat double-headed arrow 2 Upper P Upper C l Subscript 3 Baseline (g) + U

gregori [183]

Answer:

The equilibrium will shift left.

Explanation:

Hope this helps <3

6 0

2 years ago

If the initial concentration of a is 0.00540 m, what will be the concentration after 795 s?

zavuch27 [327]

Feb 19, 2014 - The units of k tell you that this is a second order reaction. So, to solve this, you need to use the integrated rate law for a 2nd order reaction: 1/[A] = kt + 1/[A]o 1/[A] = 0.540/Ms (835 s) + 1/0.00640 1/[A] = 607 [A] = 1.65X10^-3 M.

7 0

3 years ago