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Aleonysh [2.5K]
3 years ago
7

Why are all of the substances on the periodic table classified as elements?

Chemistry
2 answers:
Amanda [17]3 years ago
5 0

Substances on the periodic table cannot be broken down into other substances and are therefore elements. I just took the test and this is correct.

Readme [11.4K]3 years ago
4 0

All elements are pure substances.

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A compound possessing a carboxylic acid produces a yellow solution when dissolved in diethyl ether. This yellow solution is tran
Serga [27]

Answer:

A. The top layer will be diethyl ether, and the top layer will be yellow.

Explanation:

The purpose of the addition of the saturated aqueous solution of polar solvents like sodium chloride in the liquid-liquid extraction techniques is to remove as well as separate any kind of water which may be dissolved in the ether. Water and sodium chloride are both polar and thus, they forms the bottom layer and only ether forms the top layer. The compound being organic and is colored is in the top layer with the ether.

Hence, answer - A. The top layer will be diethyl ether, and the top layer will be yellow.

6 0
3 years ago
in a typical person, the level of glucose is about 85 mg/ 100 mL of blood. if an average body contains about 11 pt of blood, how
Vanyuwa [196]

Let's note that 1 pint = 473.1765 mL, so 11 pints should be 5204.9415 mL.

We make a proportion out of the word problem

(85 mg glucose/ 100 mL) times (1 g/ 1000 mg) = 4.4242 grams of glucose

5 0
3 years ago
How many grams of KBr is required to prepare 100 mL of<br> 2.0 M KBr solution?
sesenic [268]

Answer:

23.8g

Explanation :

Convert 2.0M into mol using mol= concentration x volume

2.0M x 0.1L (convert 100mL to L since the units for M is mol/L)

= 0.2 mol

We can now find grams by using the molar mass of KBr

=119.023 g/mol (Found online) webqc.org

but can be be calculated by using the molecular weight of K and Br found on the periodic table

We can now calculate the grams by using grams=mol x molar mass

119.023g/mol x 0.2mol

= 23.8046 g

=23.8g (rounded to 1decimal place)

4 0
2 years ago
A large piece of iron was reacted with an acid. What would happen to the rate of the reaction had the large piece been finely di
Anna007 [38]
The reaction occurs in a similar way as magnesium does, but much less vigorous. Strong heating is required to make iron powder burn in oxygen. The reaction gives out a yellow showery sparks and produces a black solid. iron reacts with dilute hydrocloric acid to give iron chloride and hydrogen gas.
3 0
2 years ago
Read 2 more answers
Which statement best describes salts? Salts form from hydrogen ions and hydroxide ions in neutralization reactions. Most salts d
aliina [53]
<h2>Answer : Option D) Solutions of salt and water conduct electricity. </h2><h3>Explanation :</h3>

The best description of salt is that when they are dissolved in water they dissociate into ions and become electrolytic in nature. This is observed that these solutions of salt will conduct electricity. Dissociation of ions helps the solution to conduct electricity. Usually salts dissociate into respective cations and anions of the salt compound. Most of the salts can be obtained as a product from neutralization reactions.

7 0
3 years ago
Read 2 more answers
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