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Lubov Fominskaja [6]
3 years ago
6

How is heat produced in a chemical change​

Chemistry
1 answer:
Snezhnost [94]3 years ago
7 0

Answer:Hola UwU

Most chemical reactions involve the breaking and formation of chemical bonds. It takes energy to break a chemical bond but energy is released when chemical bonds are formed. If more energy is released than consumed, then the chemical reaction evolves heat and is said to be exothermic.

Explanation:Adios~ UnU haha

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which molecules show an appropriate number of bonds around each carbon atom? select the three that apply.
iren2701 [21]

The appropriate number of bonds around each carbon atom are four covalent bonds

Please note that carbon has four valence electrons in its outermost shell

<h3>What is an element?</h3>

An element is a substance which cannot be split into simpler forms by an ordinary chemical process. This simply goes to say that elements are substances which cannot be decomposed into simpler substances by ordinary chemical reactions.

An atom is the smallest unit or part of an element which can take part in a chemical reaction.

On a general note, elements are classified as thus:

  • Metals, non-metal, and metalloid.

  • The extreme left side elements in the periodic table are metals, for example, aluminum, sodium, calcium, caesium, etc.

  • However, elements on the right side are generally referred to as non-metals, carbon, chlorine, oxygen,

So therefore, the appropriate number of bonds around each carbon atom are four covalent bonds

Complete question:

What is the appropriate number of bonds around each carbon atom?

Learn more about atoms and elements:

brainly.com/question/6258301

#SPJ1

5 0
2 years ago
Write the chemical symbols for three different atoms or atomic cations with 12 electrons.
ladessa [460]

1) Atomic number of magnesium (Mg) is 12, it means that it has 12 protons and 12 electrons.

Electron configuration of magnesium atom: ₁₂Mg 1s² 2s² 2p⁶ 3s².

2) Atomic number of aluminium (Al) is 13, it means that it has 13 protons and 13 electrons., but if it lost one electron, it will have 12 electrons and 13 protons and become aluminium cation Al⁺.

Electron configuration of aluminium cation: ₁₃Al⁺ 1s² 2s² 2p⁶ 3s².

3) Atomic number of silicon (Si) is 14, it means that it has 14 protons and 14 electrons., but if it lost two electrons, it will have 12 electrons and 14 protons and become silicon cation Si²⁺.

Electron configuration of silicon cation: ₁₄Si²⁺ 1s² 2s² 2p⁶ 3s².


8 0
3 years ago
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What kinds of minerals do you think are in a cell phone?​
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How might emission spectra be used in studying stars?
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Answer:

Emission spectra may be used in studying stars in order to determine what atoms makeup the individual star produces, due to the fact that each atom’s emission spectra biunique, one can observe the spectra emitted by the star and identify the atoms that are released by the light the star produces.

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Which units can be used to measure length or distance? Check all that apply.
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<u>M</u><u>eter,</u><u> </u><u>kilometer </u><u>&</u><u> </u><u>inch </u>- used to measure length or distance.

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