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3 years ago

Solid iron prllets are heated, melted and drawn into wires. This is an example of a chemical reaction. True or False

Chemistry

1 answer:

monitta3 years ago

6 0

Answer:

False

Explanation:

It is not true that this is an example of a chemical reaction. This is a typical example of physical reaction.

Most physical changes are often phase changes.

A phase change is a change in the physical state of a body.
In this change, it is from solid to liquid.
Now new substances are formed.
When substances are changed from one form to another, it is a physical change.

In a chemical change, a new substance is formed at the end of the process.

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3 years ago

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What are charged atoms of elements that have an unequal number of protons and electrons?

Sveta_85 [38]

If the number of electron is more than the protons,the atom is negative
if the number of electrons is less than the protons, the atom will be positive

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3 years ago

Pure water has a pH of 7. Pure water _______.

raketka [301]

Answer:

The concentration of Hydrogen Cation is:

Pure water is<u> NEUTRAL</u>

Explanation:

pH = It is negative logarithm of activity of Hydrogen ions.

$pH = - log(a_{[H^{+}]})$

Activity = concentration for dilute solutions

There are three types of solution based on pH:

1. Acidic solution : Those solution which have pH between 0 to 7 or less than 7 are acidic in nature . They turns blue litmus red.They contain more H+ ions than OH- ions

2. Basic : Those solution which have pH value greater that 7 of between 7 to 14 are basic in nature . They turn red litmus blue.They contain more OH- ions then H+ ions

3 . Neutral : Those solution which have pH = 7 are neutral . They are neither acidic nor basic in nature .They have equa;l concentration of H+ and OH- ions in the solution.

The given water has pH = 7 .This means it is neutral and has low H+ ion concentration in solution. The H+ ion are :

$10^{-7}$ M in water.

OH- =

$10^{-7}$ M in water

So overall neutral

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3 years ago

PLS

MrRissso [65]

Answer:

A decomposition reaction occurs when one reactant breaks down into two or more products. This can be represented by the general equation: AB → A + B. Examples of decomposition reactions include the breakdown of hydrogen peroxide to water and oxygen, and the breakdown of water to hydrogen and oxygen.

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3 years ago

Equation: CH4 + 202 CO2 + 2H20

jeka94

Answer:

2:1

1.2 × 10² g

Explanation:

Step 1: Write the balanced combustion equation

CH₄ + 2 O₂ ⇒ CO₂ + 2 H₂O

Step 2: Establish the appropriate molar ratio

According to the balanced equation, the molar ratio of O₂ to CH₄ is 2:1.

Step 3: Calculate the moles of CH₄ required to react with 15 moles of O₂

We will use the previously established molar ratio.

15 mol O₂ 1 mol CH₄/2 mol O₂ = 7.5 mol CH₄

Step 4: Calculate the mass corresponding to 7.5 moles of CH₄

The molar mass of CH₄ is 16.04 g/mol.

7.5 mol × 16.04 g/mol = 1.2 × 10² g

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3 years ago

Solid iron prllets are heated, melted and drawn into wires. This is an example of a chemical reaction. True or False​

Solid iron prllets are heated, melted and drawn into wires. This is an example of a chemical reaction. True or False