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Varvara68 [4.7K]
3 years ago
14

Which two chemists organized elements based on properties

Chemistry
1 answer:
UNO [17]3 years ago
3 0

Answer: Dmitri Mendeleev and Henry Moseley

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What coefficient should go in front of the hydrogen peroxide (H2O2 ) molecule to make the chemical equation balanced? ___ H2O2 ➞
GarryVolchara [31]

Answer:

2

Explanation:

H2O2 ➞ 2 H2O + O2

The reaction is currently not balanced because the number of atoms on the reactant side is not equal to that of the product side

Hydrogen

Reactant = 2 Product = 4

Oxygen

Reactant = 2 Product = 4

Adding 2 to H2O2 balances the reaction as the number of atoms of both elements are now balanced on both sides of the equation

2H2O2 ➞ 2 H2O + O2

8 0
3 years ago
How do you make 58.703 into having 3 dig figs ?
ch4aika [34]
Your answer would be 176.109.
8 0
3 years ago
Which of the following most likely happens when the volume of a gas increases the number of collisions of gas particles remains
lord [1]

When the collision of gas particles and the volume of the gas stay the same it causes a chemical.

5 0
3 years ago
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Does the application of heat to a substance always produce a chemical change?
tatiyna

Answer;

No, sometimes it just causes a physical change, such as ice melting to water.

Explanation;

-The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.

Heating a substance may cause a physical change or a chemical change.  For example melting ice to water, involves supplying heat to change ice into water which is a chemical change.

-On the other hand, an example of decomposition reactions are chemical reactions which involves supplying heat to a substance; for example decomposing copper (II) nitrate which yields, copper (ii) oxide, nitrogen (iv) oxide and oxygen gas, is chemical reaction.

6 0
3 years ago
Identify whether longhand notation or noble-gas notation was used in each case below. Potassium (K): 1s22s22p63s23p64s1
Vaselesa [24]

<u>Answer:</u> The given electronic configuration is long hand notation.

<u>Explanation:</u>

Long-hand notation of representing electronic configuration is defined as the arrangement of total number of electrons that are present in an element.

Noble-gas notation of representing electronic configuration is defined as the arrangement of valence electrons in the element. The core electrons are represented as the previous noble gas of the element that is considered.

The given electronic configuration of potassium (K): 1s^22s^22p^63s^23p^64s^1

The above configuration has all the electrons that are contained in the nucleus of an element. Thus, this configuration is a long-hand notation.

3 0
3 years ago
Read 2 more answers
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