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2 years ago

13

I need help with this bill nye worksheet. someone help. It's due tomorrow cant mess my grade up. I just picked a random subject

but it's science.(7th grade)

1 answer:

viva [34]2 years ago

5 0

send a better picture please and thank you

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Fill in the blanks.

ANTONII [103]

Answer:GASEOUS, LOWERING ,EMITTED AS HEAT, DOWN,DO NOT RELEASE,DECREASES,NEGATIVE.

Explanation: Filling the blanks gives

Lattice energy is associated with forming a crystalline lattice of alternating cations and anions from the _GASEOUS___________ ions.

Because the cations are positively charged and the anions are negatively charged, there is a LOWERING of potential- as described by Coulomb's law-when the ions come together to form a lattice energy.That energy is EMITTED AS HEAT when the lattice forms.

As the ionic radii increases as you move DOWN a group, ions cannot get as close to each other and therefore DO NOT RELEASE as much energy when the lattice forms. Thus the lattice energy DECREASES (becomes less) NEGATIVE as the radius increases.

The above gives the definition of Lattice Energy and how it relates to atomic and ion charge.

6 0

2 years ago

What general principle determines the molecular structure of a molecule?

Ugo [173]

I think the answer would be the number of electron in pairs that is around the central atom. This is the most general principle in determining structure of a molecule. Electrons are the ones responsible in bonding with other atoms. Hope this helped.

7 0

3 years ago

What does the green material in a plant called?

olga55 [171]

That is chlorophyll in their thylakoid membranes

5 0

3 years ago

What lays down sediment in a new location

Ne4ueva [31]

The material moved<span> by erosion is </span>sediment<span>. The agents of erosion </span>lay down sediment<span> in a process called deposition. Deposition builds </span>new<span> landforms. Weathering, erosion, and deposition act together in a cycle that wears </span>down<span> and builds up Earth's surface.
WInd, water, animals</span>

3 0

2 years ago

When equation for neutralization of HBr by Ca(OH)2 is correctly balanced, how many molecules of water will be formed

Oksana_A [137]

Answer:

When equation for neutralization of HBr by Ca(OH)₂ is correctly balanced, 1.2046*10²⁴ molecules of water will be formed

Explanation:

A neutralization reaction is one in which an acid (or acidic oxide) reacts with a base (or basic oxide). In the reaction a salt is formed and in most cases water is formed. A Salt is an ionic compound formed by the union of ions and cations through ionic bonds.

In the reactions of a strong acid (those substances that completely dissociate) with a strong base (they dissociate completely, giving up all their OH-), the complete neutralization of the species is carried out:

2 HBr (aq) + Ca(OH)₂ (s) → CaBr₂ (aq) + 2 H₂O (l)

The reaction is already balanced, complying with the law of conservation of matter. This law states that since no atom can be created or destroyed in a chemical reaction, the number of atoms that are present in the reactants must be equal to the number of atoms present in the products.

By stoichiometry of the reaction (that is, the relationship between the amount of reagents and products in a chemical reaction), 2 moles of water H₂O are formed.

On the other hand, Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023 * 10²³ particles per mole. Avogadro's number applies to any substance.

Then you can apply the following rule of three: if 1 mole of H₂O contains 6.023*10²³ molecules, 2 moles of H₂O, how many molecules does it contain?

$amount of molecules=\frac{2moles*6.023*10^{23}molecules }{1 mole}$

amount of molecules= 1.2046*10²⁴ molecules

<u><em>When equation for neutralization of HBr by Ca(OH)₂ is correctly balanced, 1.2046*10²⁴ molecules of water will be formed</em></u>

7 0

3 years ago