2 years ago

HELPPPP!!!!!!!!!!!!

Chemistry

1 answer:

xenn [34]2 years ago

3 0

Answer:

nomelase ay pa la próxima

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If the element A have three protons in the nucleus. find the atomic number of the element A

sweet-ann [11.9K]

Answer:

ATOMIC number of element A is 3

Explanation:

Atomic number is the same as number of protons of an element.

according to the periodic table, Lithium is the element with 3 protons in its neutral state and it's atomic number is 3.

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2 years ago

soaps do not work well in hard waters. But they can still be effected it large quantities of soap are added to water. Explain wh

zmey [24]

The minerals in hard water react with soap and affect its cleaning capacity. It's still possible to use hard water when washing by using more soap. The additional soap will no longer be affected by the minerals in the water, so they can clean just as effectively, but you'll be wasting more soap this way.

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2 years ago

Radioactive decay can be described by the following equation where is the original amount of the substance, is the amount of the

soldi70 [24.7K]

Answer:

Iron remains = 17.49 mg

Explanation:

Half life of iron -55 = 2.737 years (Source)

$t_{1/2}=\frac {ln\ 2}{k}$

Where, k is rate constant

So,

$k=\frac {ln\ 2}{t_{1/2}}$

$k=\frac {ln\ 2}{2.737}\ year^{-1}$

The rate constant, k = 0.2533 year⁻¹

Time = 2.41 years

$[A_0]$ = 32.2 mg

Using integrated rate law for first order kinetics as:

$[A_t]=[A_0]e^{-kt}$

Where,

$[A_t]$ is the concentration at time t

$[A_0]$ is the initial concentration

So,

$[A_t]=32.2\times e^{-0.2533\times 2.41}\ mg$

$[A_t]=32.2\times e^{-0.610453}\ mg$

$[A_t]=17.49\ mg$

<u>Iron remains = 17.49 mg</u>

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2 years ago

Choose all the answers that apply.

iVinArrow [24]

Answer:it all above

Explanation:

it all above because all the answer are truth so it all above

8 0

2 years ago

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You have two flat metal plates, each of area m2, with which to construct a parallel-plate capacitor. if the capacitance of the d

Natalka [10]

Use the equation C = εA/d

Where C = capacitance, A = area, d = distance between plates & ε = electrical permittivity of the medium between the plates

5 0

2 years ago