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3 years ago

HELP!!!! ILL GIVE THE CROWN THINGY THING!!!!!!!!!! DUE SOON!!!!!!!!! PLS HELP!!!!!!!!!!

1 answer:

8 0

Answer: A. Most radiation reaching Earth from space is blocked by the atmosphere. Therefore, some telescopes must be placed above the atmosphere.

Explanation: Astronomers have a huge problem detecting radiation from space because the Earth's atmosphere blocks most of it and stops it from reaching the surface.

Hope this helps :)

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Krypton is named after the Greek word that means “secret.” Which explains why krypton was most likely given this name?

irinina [24]

Answer:

<h2>Krypton is a halogen, so it should be kept secret because it is so reactive and toxic. Krypton is a noble gas, so it was difficult for chemists to find it, as though it was a secret.</h2>

Explanation:

<h2>PLEASE MARK ME BRAINLIEST AND FOLLOW M E LOTS OF LOVE FROM MY HEART AND SOUL DARLING TEJASWI HERE ❤️</h2>

7 0

3 years ago

Read 2 more answers

Which reaction is endothermic

anyanavicka [17]

The second one is endothermic as endothermic reactions require energy for the reaction to take place.

4 0

4 years ago

Small quantities of hydrogen gas can be prepared in the lab by addition of hydrochloric acid to zinc. The gas is typically colle

madam [21]

Answer:

0.214 L

Explanation:

Step 1: Write the balanced equation

This is a single displacement reaction.

Zn(s) + 2 HCl(aq) ⇒ ZnCl₂(aq) + H₂(g)

Step 2: Calculate the moles corresponding to 0.625 g of Zn

The molar mass of Zn is 65.38 g/mol.

0.625 g × 1 mol/65.38 g = 9.56 × 10⁻³ mol

Step 3: Calculate the moles of H₂ produced from 9.56 × 10⁻³ moles of Zn

The molar ratio of Zn to H₂ is 1:1. The moles of H₂ produced are 1/1 × 9.56 × 10⁻³ mol = 9.56 × 10⁻³ mol.

Step 4: Calculate the volume occupied by 9.56 × 10⁻³ moles of hydrogen

Assuming standard pressure and temperature, 1 mole of hydrogen occupies 22.4 L.

9.56 × 10⁻³ mol × 22.4 L/1 mol = 0.214 L

8 0

3 years ago

What results when equal but opposite charges are present in two regions of a polar molecule? A. dipole B. ionic bond C. Electron

Masteriza [31]

Answer: A. dipole

Explanation:

Dipole can be defined as the separation of the equal and opposite charges present in the molecule via ionic bonding. The water molecule comprising of two molecules of hydrogen being positively charged and one molecule of oxygen being negatively charged are connected via ionic bonding thus water molecule is an example of dipole molecule. There is unequal distribution of the electrical density throughout the molecule.

8 0

3 years ago

Is PO4^-3 polar, non-polar, or ionic?

Gala2k [10]

The answer is PO4^-3 is non-polar.

8 0

3 years ago