CHEMISTRY MIDDLE SCHOOL

how many neutrons are in the nucleus of an atom that has an atomic mass of 36 and an atomic number of 25

Answers

Answer 1

Answer:

Answer:

11neutrons

Explanation:

neutronnumber=Massnumber-Atomic number

givenmassnumber =36

atomicnumber=25

neutron number=36-25

neutron number=11

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In a periodic table, dots around an elements symbol indicate the number of valence electrons in an atom ? True Or False

Answers

True,I think.(so don't really count on my answer sorry :D)

I need help please on these questions, i can not do the model, so please help me, if you could give me an example that would be great 1. Which of the stages of the water cycle were you able to observe in your model?

2. What is the energy source in your model and what does it represent?

3. Did you observe evapotranspiration in your model? If yes, where? If no, how
could you have demonstrated it?

4. Where in your model does condensation occur more rapidly? How do you know?

5. Do you think your model accurately demonstrates the water cycle? Why or why
not? If you were to redesign your model, how would you refine it?
5 point for each.

Answers

1. What were you able to observe
2. What runs the whole thing
3. Not to sure...maybe someone will have a better answer for you sorry!
4. Where does a vapor or gas turn into a liquid
5. Do you think that the model you did demonstrates a water cycle? And if you were to redo it, how would you redo it and demonstrate it!

The energy levels of an atom are occupied by ____.

Answers

Electrons occupy the energy levels of an atom.

Final answer:

The energy levels of an atom are occupied by electrons. These energy levels are often represented as shells, and each level can hold a specific number of electrons. Electrons are crucial in determining an atom's properties.

Explanation:

The energy levels of an atom are occupied by electrons. An atom's structure consists of a nucleus, which is surrounded by the energy levels. These energy levels, often represented as shells, house the electrons. For example, the first energy level can accommodate up to 2 electrons, while the second energy level can hold up to 8. These electrons play a critical role in determining the physical and chemical properties of atoms and subsequently, the substances they form.

Learn more about Electrons here:

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Why would a large iceberg have more thermal energy than a cup of boiling water?

Answers

Answer:

Answer: Boiling water has a lot more heat than the oven's air (even though the air has a higher temperature). ... The iceberg has more heat than the match because it is SO MUCH LARGER, so all of its slow moving molecules have more total kinetic energy than the match's molecules.

Explanation: I got this from google, and hope it helps, if not, comment below please!!!

Write your answer in scientific notation and Stanford form. $(1.2 * {10}^(7))(4 * {10}^( - 2))$

Answers

The answer is 4.8 x 10^5 in scientific notation and 480,000 in standard form.

To multiplying numbers in scientific notation, you need to multiply the coefficients and add the exponents.

Using the given numbers, (1.2 x 107) and (4 x 10-2), we multiply the coefficients 1.2 and 4 to get 4.8.

Then, we add the exponents 7 and -2 to get 5.

Writing the result in scientific notation, we have 4.8 x 105.

In standard form, this is expressed as 480,000.

Therefore, the answer in scientific notation is 4.8 x 105 and in standard form is 480,000.

Learn more about multiplying numbers in scientific notation here:

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1.2 x 10000000 = 12000000
4 x .10 = .4
12000000 x .4 = 4,800,000
= 4.8 x 10^6
The little numbers after the 10 tells you how many times you move the numbers decimal. We do this so we can simplify bigger numbers.

What were the limitations of democritus's ideas about atoms

Answers

he thought that atoms were the smallest particle and could not be divided any more. the word 'atomos' which atom is derived from, means indivisible. we now know that atoms are made of sub-atomic particles, which are made of quarks (what sort of name is that), and these quarks are made of leptons and gluons.

Final answer:

Democritus's ideas about atoms were limited in that he claimed they were indivisible and indestructible, lacked experimental evidence, and didn't account for chemical behavior or atomic bonding.

Explanation:

Democritus, an Ancient Greek philosopher, made significant strides in atomic theory. However, his ideas had several limitations. Firstly, he believed that atoms were indivisible and indestructible, which we now know is incorrect, with subatomic particles like protons, neutrons, and electrons forming atoms. Secondly, Democritus had no experimental evidence to support his ideas, they were purely philosophical. Lastly, his theory did not account for chemical behavior or the bonding of atoms, concepts that are now fundamental to our understanding of chemistry.