Which of the following statements is true?A. Protons are located outside the nucleus of an atom.
B. Individual atoms can be seen with the naked eye.
C. The nucleus of an atom contains protons and neutrons.

Answers

Answer 1

Answer: The correct answer is C. Atoms are incredibly small and can bearly be seen with the most powerful electron microscopes. The nucleas of an atom contains protons and neutrons with electrons in orbitals around the nucleas. I hope this helps. Let me know if anything is unclear.

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Which statement is true? Select one: a. Hydroelectric power, a nonrenewable resource, is generated from moving water. b. Oil, a nonrenewable resource, is processed to make jet fuel. c. Propane, a renewable resource, is used in some heating systems. d. The energy from the sun, a nonrenewable resource, can be converted to electricity in solar cells.
Although expensive, platinum is used as a catalyst to break down harmful gases in car exhaust into less harmful gases. Which statement best describes platinum in this use? a.It is a homogeneous catalyst, so only a small amount is needed even though it exits with the products. b.It is a heterogeneous catalyst, so only a small amount is needed and it is easily separated from the products. c.It is a homogeneous catalyst, so although a large amount is needed, it is easily separated from the products. d.It is a heterogeneous catalyst, so a large amount is needed and it exits with the products.
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Which mass measurement contains four significant figures?(1) 0.086g (3) 1003g(2) 0.431g (4) 3870g

Answers

Answer: option (3) 1003 g.

Explanation:

1) 0.086 g has two signficant figures, because the zeros to the left of the decimal period and to the right of the decimal period and before the first non zero digit do not count. Those zeros only tell the place value of the other digits. So, only 8 and 6 are significan figures: two.

2) 0.431g has three significant figures: the 0 before the decimal period do not count. Only 4, 3, and 1 are signficant figures: three.

3) 1003 g has four significant figures, because the zeros in between the other digits count. So, 1, 0, 0, and 3 are significant figures.

4) 3870 g has three significant figures, because the 0 after the other 3 digits is only to determine the place value of the first three digit. Only 3, 8, and 7 here are significant figures.

Final answer:

Among the provided options, the mass measurement '1003g' contains four significant figures. In significant figure rules, leading zeros are not counted while zeros between non-zero numbers and zeros that come after a non-zero number, in a whole number representation, are significant.

Explanation:

In the context of mass measurement in chemistry, significant figures are crucial as they represent the precision of a measurement. Among the provided options: 0.086g, 1003g, 0.431g, and 3870g, the mass measurement 1003g contains four significant figures.

To clarify, leading zeros (e.g., 0.086g) are not counted as significant figures. In whole numbers, however, trailing zeros are counted as significant figures if they directly follow a non-zero number (e.g., 1003g). Therefore, the mass measurement '1003g' actually has four significant figures: 1, 0, 0, and 3.

However, the trailing zeros in '3870g' are not considered significant as there's no decimal point specified.

Learn more about Significant Figures here:

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PLEASE HELP
What are 10 scientific things that happened in the hunger games

Answers

Mocking Jays (Genetic Mutations)
Hybrid Dogs (Genetic Mutations)
Advanced Medicine (Extremely fast healing)
Advanced Medicine (Ways to regrow limbs, although Peta's didnt work)
Advanced War Technology (Technology is science)
Advanced ways to project messages (Technology again)

Sorry, thats all i can come up with, I'll comment some more if I can think of any, sorry :(

A _______ is formed when tectonic plates collide.

Answers

A convergent plate boundary is formed when tectonic plates collide

Absolute proof about the origin of a crater on the moon or the "star of Bethlehem" cannot be determinedusing the scientific method.
True
False

Answers

Correct Answer: TRUE

The other answer is incorrect, I just did the assignment and got it right.

your answer is False love!

In the following electrochemical cell, what is the reduction half-reaction? Mn(s) | Mn2+(aq) || Fe3+(aq), Fe2+(aq) | Pt(s)

Answers

In the given electrochemical cell, the reduction half-reaction occurs at the electrode on the right side of the double vertical line (||).

To determine the reduction half-reaction, we need to compare the standard reduction potentials (E°) of the species involved. The half-reaction with the more positive E° value will be the reduction half-reaction.

Looking up the standard reduction potentials in a reference table, we find that the standard reduction potential for the Mn2+/Mn couple is -1.18 V, and the standard reduction potential for the Fe3+/Fe2+ couple is +0.77 V.

Since the Fe3+/Fe2+ couple has a more positive standard reduction potential, it will undergo reduction. Therefore, the reduction half-reaction is:

Fe3+(aq) + e- → Fe2+(aq)

I hope this helps!

Which of the following atoms has the same number of neutrons as 19F?a. 16O
b. 18F
c. 20Ne
d. 23Na