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3 years ago

Fill in the chart to identify how scientists represent matter and chemical changes in matter.

Chemistry

1 answer:

lidiya [134]3 years ago

5 0

Chemical symbol is a short notation derived from the scientific name of a chemical element—e.g., S for sulfur and Si for silicon.

A chemical formula is an expression that shows the elements in a compound and the relative proportions of those elements. eg- Water is composed of hydrogen and oxygen in a two to one ratio. The chemical formula for water is H 2 O. One more eg we can give of is Sulfuric acid which is composed of the elements hydrogen, sulfur, and oxygen. The chemical formula for sulfuric acid is H 2 SO 4 .

the method of representing a chemical reaction with the help of symbols and formulae of the substances involved in it is known as chemical equation.for example, Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas

this can be represented by chemical equation as follows, (see the above pic)

I hope it helps u!!!

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An atom of which element in the ground state contains electrons in the fourth principal energy level?

krok68 [10]

Kr
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3 years ago

A marine biologist is preparing a deep-sea submersible for a dive. The sub stores breathing air under high pressure in a spheric

Luba_88 [7]

Complete Question

A marine biologist is preparing a deep-sea submersible for a dive. The sub stores breathing air under high pressure in a spherical air tank that measures 74.0 wide. The biologist estimates she will need 2600 L of air for the dive. Calculate the pressure to which this volume of air must be compressed in order to fit into the air tank. Write your answer in atmospheres. Round your answer to significant digits.

Answer:

The pressure required is $P_2= 12.2 \ atm$

Explanation:

Generally the volume of a sphere is mathematically denoted as

$V_s = \frac{4}{3} * \pi r^3$

Substituting $r = \frac{d}{2} = \frac{74}{2} = 37cm$

$V_s = \frac{4}{3} * 3.42 * (37)^2$

$V_s = 2.121746 *10^5 cm^3$

Converting to Liters

$V_s = \frac{2.121746 *10^5}{1000}$

$V_s= 212.1746L$

Assume that the pressure at which the air is given to the diver is 1 atm when the air was occupying a volume of 2600L

From Charles law

$P_1V_1 = P_2 V_s$

Substituting $V_1 =2600 L$ , $P_1 = 1 atm$ , $V_s =212.1746L$ , and making $P_2$ the subject we have

$P_2 = \frac{P_1 * V_1}{V_s}$

$= \frac{1 * 2600}{212.1746}$

$P_2= 12.2 atm$

6 0

3 years ago

Discuss the changes of heated copper sulfate crystals and its reaction upon the addition of water. Write the reaction equation

Arturiano [62]

Explanation:

If copper sulphate crystals are added to water then, the particles of copper sulphate crystals loses attraction between them and starts moving continuously and gets mixed up with water. It is called 'hydrated copper sulphate solution which is having a blue colour.

3 0

3 years ago

Use the chemical equation below to answer the following two questions.

umka2103 [35]

3 answer for number 3.4 is the answer for number 4

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4 years ago

The three nuclides, U-233, U-235, and U-238, are isotopes of uranium because they have the same number of protons per atom and A

snow_tiger [21]

Answer:

The correct answer is - C) a different number of neutrons per atom.

Explanation:

Isotopes of an element are the same element and same atomic number but with different atomic mass and physical properties. The difference in their atomic mass occurs due to isotopes of an element have a different number of neutrons per atom.

The number of protons and the numbers of electrons are the same in the isotopes but only change occurs in the numbers of the neutrons. In isotopes of uranium U-233, U-235, and U-238 have the same number of protons but a different number of neutrons per atom.

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3 years ago