As temperature increases substances go from the

1 answer:

3 0

Answer: As the temperature decreases or pressure increases substances move toward the solid state. Solids have a definite shape and a definite volume due to the fact that their particles are relatively close together and are merely vibrating, contrary to popular convention, the particles of a solid are moving.

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According to periodic table which elements has seven valence electrons

kondaur [170]

Halogens have seven valence electrons and reqires one more electron to complete its octet

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3 years ago

Which of the following is the closest to the observed abundance of 71Ga, one of two stable gallium isotopes (69Ga and 71Ga). The

Marina86 [1]

You must see the mass of Gallium in the periodic table. The mass present there is calculated by a weighted average of the mass of the isotopes, where the weights are the abundances of each isotope. Let X the isotopic abundance of Ga⁷¹. Since there are only Ga⁶⁹ and Ga⁷¹, the isotopic abundance of Ga⁶⁹ is 1-X. Then:

$m(Ga)_{periodic~table}=(1-X)\cdot m(Ga^{69})+X\cdot m(Ga^{71})\\\\69.7=(1-X)\cdot69+X\cdot71\\\\ 69.723=69-69X+71X\\\\ 2X=0.723\\\\ X=0.3615\\\\ \boxed{X=36.15\%}$

I don't know the options, but probably 40% is the closest to 36.15%.

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3 years ago

What is the velocity of a first-order reaction when the reactant concentration is 6 x 10-2M and the rate constant is 8 x 103sec-

tresset_1 [31]

Answer:

D) 4.8 × 10² M/s

Explanation:

Let's consider the following generic reaction.

A → B

The rate law is:

v = k . [A]ⁿ

where,

v: velocity

k: rate constant

[A]: concentration of the reactant A

n: reaction order for A

<em>What is the velocity of a first-order reaction when the reactant concentration is 6 × 10⁻²M and the rate constant is 8 × 10³s⁻¹?</em>

v = k . [A]¹ = 8 x 10³s⁻¹ . 6 x 10⁻²M = 4.8 × 10² M/s

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10. Burning trash to reduce the amount thrown in landfills is called -

alex41 [277]

Answer:

D. Incinerating or incineration

Explanation:

Burning trash to reduce the amount of waste on land is called incineration.

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alexgriva [62]

Water forms a covalent bond and oil forms a noncovalent bond

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