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zhuklara [117]
3 years ago
12

*Physical science*PLEASE HELP ME

Chemistry
1 answer:
kondaur [170]3 years ago
5 0

Answer:

The answer to your question is:

Explanation:

Mass number is the sum of protons and neutrons if an atom.

Protons and neutrons in the atom.  This is true is the definition of mass number.

Neutrons and electrons in the atom.  It's false, if we sum the number of neutrons and electrons, the result could be the same as the mass number but it's not the definition of mass number.

Protons in the atom.  Incorrect, if only consider protons that is atomic number not mass number.

Electrons in the atom. Incorrect, mass number doesn't consider electrons in its definition.

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How many moles of CO2 are in 870 mL of a 0.75 M solution?
alukav5142 [94]
Volume in liters:

870 mL / 1000 => 0.87 L

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hope this helps!
8 0
3 years ago
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2.<br> Why does<br> a chemical equation<br> need to<br> be balanced?
arlik [135]

<em>Answer:</em>

<em>Chemical equations must be balanced to satisfy the law of conservation of matter, that states that matter cannot be produced or destroyed in a closed system. The law of conservation of mass governs the balancing of a chemical equation.</em>

Explanation:

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In which type of chemical reaction do two or more substances combine to form one substance?
pishuonlain [190]
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4 years ago
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The temperature at the surface of the Sun is approximately 5,150 K, and the temperature at the surface of the Earth is approxima
dezoksy [38]

Answer:

ΔS = 16.569 J/K

Explanation:

In this case, we need to use the correct expression to solve this. In thermodynamics, the expression to use that puts a relation between heat, temperature and entropy is the following:

ΔS = Q/T

To determine the entropy change of the universe, we need to sum the entropy change of Earth and the entropy of the sun.

As the sun is transfering radiation to Earth, the sun is losing energy, therefore, heat is negative, while Earth receives the heat, so it's positive. Calculating the entropy for the sun and Earth:

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6 0
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