Give the chemical name and formula for limestone.

Answers

Answer 1

Answer: CaCO3, it's called calcium carbonate :D

Answer 2

Answer: limestone calcium carbonate CaCO3
common chemical name formula

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A 0.300 g piece of copper is heated and fashioned into a bracelet. The amount of energy transferred by heat to the copper is 66,300 J. If the specific heat of copper is 390 J/g 0C, what Is the change of the copper's temperature?

What does it mean to discuss the concentration of a solution

Answers

When you are discussing the concentration of solution, you are discussing how many particles there are in a given amount of solvent. You are comparing. If there is more solute in a beaker of solvent, then it is highly concentrated. If there is less solute in a beaker of the same amount of solvent, then it is less concentrated or more dilute. The terms diluted and concentrated are related to each other. These words are used to compare certain solutions to each other, since there is nothing like numbers, these words are relative to one another.

As the activation energy of a reaction decreases, the number of molecules with at least this much energy ______________.

Answers

Answer:

Increasing

Explanation:

This element has a complete outermost energy level and is found in the 4th period.

Answers

Krypton Krypton has 8 electrons in the outermost energy level. Tip:All elements excluding the Lanthinides and Aninides are in order by molecular structure, kind of. The last column will have a full outermost energy level

1. How many ATOMS of boron are present in 2.20 moles of boron trifluoride ? atoms of boron. 2. How many MOLES of fluorine are present in 5.35*1022 molecules of boron trifluoride ? moles of fluorine.

Answers

Answer:

1. How many ATOMS of boron are present in 2.20 moles of boron trifluoride? atoms of boron.

2. How many MOLES of fluorine are present in of boron trifluoride? moles of fluorine.

Explanation:

The molecular formula of boron trifluoride is $BF_3$ .

So, one mole of boron trifluoride has one mole of boron atoms.

1. The number of boron atoms in 2.20 moles of boron trifluoride is 2.20 moles.

The number of atoms in 2.20 moles of boron is:

One mole of boron has ---- $6.023x10^2^3$ atoms.

Then, 2.20 moles of boron has

- $=2.20 mol. x 6.023 x 10^2^3 atoms /1 mol\n=13.25x10^2^3 atoms$

2. Calculate the number of moles of BF3 in 5.35*1022 molecules.

$(5.35x10^2^2 molecules/6.023x10^2^3)x 1mol\n=0.0888mol$

One mole of boron trifluoride has three moles of fluorine atoms.

Hence, 0.0888moles of BF3 has 3x0.0888mol of fluorine atoms.

=0.266mol of fluorine atoms.

Are blue stars young or old? How can you tell?.

Answers

Astronomers measure the brightness of stars using light-years. This means that the light we see now left in that years ago, traveling through space in that distance at kilometer per second.

A star is born, it radiates energy for a long time, toward the end it expands, it may or may not explode, and then it dies. It vary in sizes, masses and surface temperature range. The colors of stars reflect their surface temperature. Their relative brightness is expressed in a scale of six magnitudes. The brightest the stars are first-magnitude stars, while the dimmest are sixth-magnitude stars.

The lower the number, the brighter the star.

For example:
Star color Surface Temperature
Blue-white around 25 000 K & higher
white around 10 000 K
yellow around 7 000 K
Red around 5 000 K & lower

Which has a larger radius Me or Xe?

Answers

Xe is bigger:)

I hope I helped:)

Please leave a thanks:)

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