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Gnom [1K]
3 years ago
10

which best describes an element? - a pure substance - a type of a mixture - a pure compound - an impure substance

Chemistry
2 answers:
Nikitich [7]3 years ago
7 0
An element is a pure substance which means it cannot be broken down by any means.
STatiana [176]3 years ago
4 0

Answer:

A pure substance

Explanation:

An element is a pure substance.

It is only made up of atoms of the same type.

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ans is: 1s2, 2s2 ,2p1,...

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Why do scientific theories change?
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Scientific theories change because<span> </span>theories<span> may be modified or overturned as new evidence and perspective emerges. ... The process of </span>theory change<span> may take time and involve controversy, but eventually the </span>scientific<span> explanation that is more accurate will be accepted. Hoped you get it!</span>
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Sulfur dioxide gas reacts with oxygen gas to form sulfur trioxide gas. express your answer as a chemical equation. identify all
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3 years ago
Choose the correct products for the double replacement reaction below. Click here to access the solubility rules to determine wh
Lemur [1.5K]

MgCl₂ & PbSO₄ is the correct product for the given double replacement reaction.

<h3>What is double displacement reaction?</h3>

In the double displacement reaction displacement of two substrate will take place among two reactants and formation of products takes place.

In the question, PbCl₂ reacts with MgSO₄ and displacement between the cations takes place and formation of  MgCl₂ and insoluble precipitate PbSO₄ is formed.

Given reaction is represented as:

PbCl₂ + MgSO₄ → MgCl₂ + PbSO₄

According to the activity series, reactivity of Magnesium is more as compared to the lead atom. So lead is displaced by the magnesium atom and form the above given products.

Hence, option (3) is correct i.e. MgCl₂ & PbSO₄.

To know more about double displacement reaction, visit the below link:

brainly.com/question/26413416

8 0
2 years ago
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The density of a substance is 17.5 g/mL. Determine the volume (in mL) of 63.6 g of this substance.​
andreyandreev [35.5K]

Answer:

<h2>volume = 3.63 mL</h2>

Explanation:

The density of a substance can be found by using the formula

<h3>Density =  \frac{mass}{volume}</h3>

Since we are finding the volume

Making volume the subject we have

<h3>volume =  \frac{mass}{Density}</h3>

From the question

mass = 63.6 g

Density = 17.5 g/mL

Substitute the values into the above formula and solve for the volume

That's

<h3>volume =  \frac{63.6}{17.5}</h3>

We have the final answer as

<h3>volume = 3.63 mL</h3>

Hope this helps you

5 0
3 years ago
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