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3 years ago

How can you tell a chemical change has happened?

Chemistry

2 answers:

Paladinen [302]3 years ago

4 0

Answer:

How can I tell if a chemical reaction is occurring? A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change.

Explanation:

Kisachek [45]3 years ago

3 0

Answer:

You can tell when a chemical change has happened when the chemical changes in appearance such as color or physical state.

Explanation:

If a change happens it can change in any way shape or form.

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Oxygen and hydrogen are both elements that are found as gases at room temperature. When oxygen combines with hydrogen, they prod

Tom [10]

Answer:

Explanation:

has properties that are different from the original substances.

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3 years ago

How many atoms are there in 24 moles of Fe?

Semenov [28]

Answer: There are $145 \times 10^{23}$ atoms in 24 moles of Fe.

Explanation:

According to the mole concept, 1 mole of a substance contains $6.022 \times 10^{23}$ atoms.

Therefore, atoms present in 24 moles of Fe are calculated as follows.

$24 mol \times 6.022 \times 10^{23} atoms/mol\\= 144.52 \times 10^{23} atoms\\or, 145 \times 10^{23} atoms$

Thus, we can conclude that there are $145 \times 10^{23}$ atoms in 24 moles of Fe.

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3 years ago

Identify a cation. An atom that has gained a proton. An atom that has lost an electron. An atom that has gained an electron. An

iren2701 [21]

the answer would be B an atom that has lost an electron

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2 years ago

a- If an Lithium (atomic number 3) atom has a -2 charge, how many electrons does it have? b- Why do you do it this way? c- Is th

Darina [25.2K]

Answer:

Explanation:

A lithium atom with an atomic number of 3 and a charge of -2 will have a total number of electrons.

The atomic number is the number of protons in an atom. For a neutral atom that has not gained or lost electrons, the atomic number is the same as the number of electrons.

neutral atom: atomic number of electrons

For neutral atom of lithium, we will have 3 electrons

Now, lithium with a charge of -2 has gained two more electrons to the original 3 this now makes it 5.

ii.

It is an anion because it is negatively charged.

Negatively charged particles are called anion.

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2 years ago

A particular atom has 58 protons and 82 neutrons. what are the atomic number, mass number, and periodic table symbol of this iso

nika2105 [10]

The answers are name: Cerium, symbol: Ce, atomic number: 58, and atomic mass: 140.110

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3 years ago

Read 2 more answers