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3 years ago

I NEED HELP PLEASE!!!!!

2 answers:

7 0

Atoms can be divided more so thats not true. atoms from the same element arent all nesacarly identical because of isotopes

jolli1 [7]3 years ago

5 0

Atoms of different elements can combine physically and chemically.
Chemical reactions occur when atoms are joined or separated.

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How much of a 1.00 mg sample of americium remains after 3 half-lives?

notka56 [123]

Answer: 0.125mg americium

Half-lives is a set of duration when a sample will become half of their original mass. In this case, the initial mass is 1mg and the sample is going for 3 times half-lives. Then the calculation would be: 1mg $1/2^{3}$ = 1/8 mg= 0.125mg.

5 0

4 years ago

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A chemistry student mixes 5 grams of sodium chloride (NaCl) in 100 ml of water and stirs until all of the salt is dissolved. Onc

IrinaVladis [17]

I think the answer is A, but I have the same question, so if you know the correct answer, could you let me know? Thanks!

6 0

3 years ago

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Blood is buffered within a narrow range around a pH of 7.4. This means that the pH of blood will remain close to 7.4 when _____.

NNADVOKAT [17]

We are given withe the data that blood buffered to pH of 7.4. This means the pH of blood will remain close to 7.4 when A. <span>moderate amounts of acid or base are added. When buffers are added,no significant changes in the pH occurs afterwards. </span>

7 0

3 years ago

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Ethylenediamine (en) forms an octahedral complex with Ni2+(aq) with the formula [Ni(en)3]2+. Ni2+(aq) + 3 en ⇌ [Ni(en)3]2+(aq) K

yawa3891 [41]

Answer:

$3.125\times 10^{-19} mol/L$ is the concentration of $Ni^{2+}(aq)$ in the solution.

Explanation:

$Ni^{2+}(aq) + 3 en\rightleftharpoons [Ni(en)_3]^{2+}(aq)$

Concentration of nickel ion = $[Ni^{2+}]=x$

Concentration of nickel complex= $[[Ni(en)_3]^{2+}]=\frac{0.16 mol}{2 L}=0.08 mol/L$

Concentration of ethylenediamine = $[en]=\frac{0.80 mol}{2 L}=0.40 mol/L$

The formation constant of the complex = $K_f=4.0\times 10^{18}$

The expression of formation constant is given as:

$K_f=\frac{[[Ni(en)_3]^{2+}]}{[Ni^{2+}][en]^3}$

$4.0\times 10^{18}=\frac{0.08 mol/L}{x\times (0.40 mol/L)^3}$

$x=\frac{0.08 mol/L}{4.0\times 10^{18}\times (0.40 mol/L)^3}$

$x=3.125\times 10^{-19} mol/L$

$3.125\times 10^{-19} mol/L$ is the concentration of $Ni^{2+}(aq)$ in the solution.

6 0

4 years ago

Which compound most likely has atoms held together by ionic bonds?

yulyashka [42]

Answer:

d. magnesium sulfide, mgs

Explanation:

Ionic bonds or also called eletrovalent bond is one of the chemical bonds that forms between the atoms of molecules or compounds. It is the kind of bond that forms between a positively charged atom and a negatively charged atom. The positive atom transfers electrons to the negative atom.

In this question, Magnesium Sulfide, MgS is a compound whose atoms are held together by ionic bonds. The magnesium ion (cation) transfers its two valence electrons to the sulfur ion (anion) to form the stable MgS.

5 0

4 years ago