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aalyn [17]
2 years ago
8

A radioactive isotope has a half-life of 2.0 years. The fraction of a pure sample of the isotope

Chemistry
2 answers:
Hunter-Best [27]2 years ago
7 0

Answer:

its a. 1/8

Explanation:

Arisa [49]2 years ago
3 0
Answer:

1/8

Explanation:

Uhm whatever the guy said ^ yeah hope you pass
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What are the four main components of Darwins theory of evolution?
uranmaximum [27]

Answer:

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Explanation:

<em>t</em><em>h</em><em>e</em><em>r</em><em>e</em><em> </em><em>a</em><em>r</em><em>e</em><em> </em><em>f</em><em>o</em><em>u</em><em>r</em><em> </em><em>p</em><em>r</em><em>i</em><em>n</em><em>c</em><em>i</em><em>p</em><em>l</em><em>e</em><em>s</em><em> </em><em>a</em><em>t</em><em> </em><em>w</em><em>o</em><em>r</em><em>k</em><em> </em><em>i</em><em>n</em><em> </em><em>e</em><em>v</em><em>o</em><em>l</em><em>u</em><em>t</em><em>i</em><em>o</em><em>n</em><em> </em><em>v</em><em>a</em><em>r</em><em>i</em><em>a</em><em>t</em><em>i</em><em>o</em><em>n</em><em>,</em><em> </em><em>i</em><em>n</em><em>h</em><em>e</em><em>r</em><em>i</em><em>t</em><em>a</em><em>n</em><em>c</em><em>e</em><em>,</em><em> </em><em>s</em><em>e</em><em>l</em><em>e</em><em>c</em><em>t</em><em>i</em><em>o</em><em>n</em><em> </em><em>a</em><em>n</em><em>d</em><em> </em><em>t</em><em>i</em><em>m</em><em>e</em><em>.</em><em> </em><em>t</em><em>h</em><em>e</em><em>s</em><em>e</em><em> </em><em>a</em><em>r</em><em>e</em><em> </em><em>c</em><em>o</em><em>n</em><em>s</em><em>i</em><em>d</em><em>e</em><em>r</em><em>e</em><em>d</em><em> </em><em>t</em><em>h</em><em>e</em><em> </em><em>c</em><em>o</em><em>m</em><em>p</em><em>o</em><em>n</em><em>e</em><em>n</em><em>t</em><em>s</em><em> </em><em>o</em><em>f</em><em> </em><em>t</em><em>h</em><em>e</em><em> </em><em>e</em><em>v</em><em>o</em><em>l</em><em>u</em><em>t</em><em>i</em><em>o</em><em>n</em><em>a</em><em>r</em><em>y</em><em> </em><em>m</em><em>e</em><em>c</em><em>h</em><em>a</em><em>n</em><em>i</em><em>s</em><em>m</em><em> </em><em>o</em><em>f</em><em> </em><em>n</em><em>a</em><em>t</em><em>u</em><em>r</em><em>a</em><em>l</em><em> </em><em>s</em><em>e</em><em>l</em><em>e</em><em>c</em><em>t</em><em>i</em><em>o</em><em>n</em><em>.</em>

7 0
3 years ago
A central atom has two lone pairs on opposite sides and four single bonds. What is the molecule geometry of the result?
Alexeev081 [22]

The correct answer is C. square planar

According to the Valence Shell Electron Pair Repulsion Theory(VSEPR), The shape of a molecule depends on the number of electron pairs in the molecule.

VSEPR theory was first coined by Gillespie  and Nyhlom in 1957 as an improvement over the Sidgwick - Powell theory.

According to this theory, the shape of a molecule is determined by the number of electron pairs that surround the valence shell of the central atom in the molecule.  The electron pairs are positioned as far apart in space as possible to minimize repulsion of electron pairs.

However, the presence of lone pairs distorts the shape anticipated for the molecule on the basis of VSEPR.

For a molecule having six electron pairs, an octahedral geometry is expected(electron domain geometry). However, the presence of two lone pairs which are positioned at opposite side of the four single bonds leads to an observed square planar molecular geometry.

brainly.com/question/13591921

4 0
2 years ago
Check all the statements that describe applications and properties of substances that result from intermolecular forces.
skad [1K]
(Answers)
1. The ability of water to form bubbles. 
2. The formation of a meniscus in a graduated cylinder with water. 
3. The inability of water to mix with oil.
4. The melting point of a substance. 
5. The ability of detergents to wash clothes. 
Hope this helps!
7 0
3 years ago
Read 2 more answers
A potential energy diagram is shown.<br> What is the activation energy of this reaction?
xxMikexx [17]

Answer:

Ea = 35 kJ.

Explanation:

Activation energy (Ea) is the difference between the potential energy of intermediate "activated complex/ peak" and reactants.

Ea = P.E. of products - P.E. of reactants = 65 kJ - 30 kJ = 35 kJ.

kindly find the attached image.

3 0
3 years ago
Balance the reactions which form ions. Choose "blank" if no other coefficient is needed. Writing the symbol implies "1."
Minchanka [31]
Following are the Balanced Reactions,

Reaction 1:


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Reaction 2:

                                     PbI₂    →    Pb⁺²<span>  +  <u>2</u> I</span>⁻¹

Reaction 3:

                              <span>(NH</span>₂<span>)</span>₃<span>PO</span>₄     →     <span><u>3</u> NH</span>₄⁺  <span>+   PO</span>₄⁻³
7 0
3 years ago
Read 2 more answers
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