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3 years ago

What are the 4 different types of chemical reactions? And how to remember them

Chemistry

2 answers:

Tju [1.3M]3 years ago

4 0

Synthesis, decomposition, single replacement and double replacement.

finlep [7]3 years ago

3 0

Adding on to C5h11no2, examples of the 4 chemical reactions are..
Synthesis A+B= AB (the two elements combine)
Decomposition: AB= A+B (the two elements breakdown)
Single Replacement: AB+C=AC+B (An element is switched with another from the reactant to the product)
Double Replacement: AB+CD=AC+BD (Both elements are switched with another from the reactant to the product)

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Consider a mixture of NaCl and NaNO3 that is 31.8% Na by mass. Calculate the percentage by mass of NaCl in the mixture.

lutik1710 [3]

Answer: The percentage by mass of NaCl in the mixture is 38.5 %

Explanation:

To calculate the mass percentage of element in compound, we use the equation:

$\text{Mass percent of element}=\frac{\text{Mass of element}}{\text{Mass of compound}}\times 100$ .......(1)

For NaCl:

Mass of sodium element = 23 g

Mass of NaCl = 58.5 g

Putting values in equation 1, we get:

$\text{Mass percent of sodium element}=\frac{23g}{58.5g}\times 100=39.32\%$

Mass fraction of sodium metal in NaCl = 0.3932

For $NaNO_3$ :

Mass of sodium element = 23 g

Mass of $NaNO_3$ = 85 g

Putting values in equation 1, we get:

$\text{Mass percent of sodium element}=\frac{23g}{85g}\times 100=27.1\%$

Mass fraction of sodium metal in sodium nitrate = 0.271

Let us assume the mass fraction of NaCl in the mixture is 'x'

So, the mass fraction of $NaNO_3$ in the mixture will be '(1-x)'

We are given:

Percent by mass of Na in the mixture = 31.8 %

Mass fraction of Na in the mixture = 0.318

Evaluating the mass fraction of NaCl in the mixture:

$[(x\times 0.3932)+((1-x)\times 0.271)]=0.318$

x = 0.385

Percent by mass of NaCl in the mixture will be = $(0.385\times 100)=38.5\%$

Hence, the percentage by mass of NaCl in the mixture is 38.5 %

4 0

3 years ago

Howmany copper atoms there is in Copper(II) oxide?

Oxana [17]

Answer:

copper(ll) has 4 oxygen atoms

8 0

3 years ago

Read 2 more answers

Block X and Block Y have the same mass. Both blocks are placed into a container of pure water. Block X floats in the water, and

Nesterboy [21]

Answer:

Block Y is heavier than Block X.

Explanation:

5 0

4 years ago

Calculate the volume of each of the following gases at STP

kherson [118]

For Ar :

1 mol ------------ 22.4 L ( at STP )
7.6 mol ---------- x L

x = 7.6 * 22.4

x = 170.24 L
-----------------------------------------------------------------
For C2H3:

1 mol ------------ 22.4 ( at STP)
0.44 mol --------- y L

y = 0.44 * 22.4

y = 9.856 L

hope this helps !.

7 0

4 years ago

Complete the table below by writing the symbols for the cation and anion that make up each ionic compound.

marysya [2.9K]

The ions are as follows;

As2O3 - As^3+, O^2-
MnS - Mn^2+, S^2-
VCl3 - V^3+, Cl^-
NiF2 - Ni^2+, F^-

<h3>What is a cation and an anion?</h3>

A cation is a positive ion while an anion is a negative ion. Ionic compounds are composed o cations and anions.

The anions and cations in the ionic compounds in the table are shown below;

As2O3 - As^3+, O^2-
MnS - Mn^2+, S^2-
VCl3 - V^3+, Cl^-
NiF2 - Ni^2+, F^-

Learn more about cations and anions:brainly.com/question/4933048

#SPJ1

6 0

2 years ago