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3 years ago

Help Asap plz Thx giving lots of points!!!

Chemistry

1 answer:

3241004551 [841]3 years ago

3 0

29. B) A population changes in response to a change in the environment.

<u>Evolution is the process by which new species of organisms develop from earlier forms. Most often, in response to a change in a species environment. It's the frequent change of the alleles in a population. </u>

30. A) Describes the relationship between an organism and its environment

<u>Darwin made this theory of evolution by natural selection as an explanation for adaptation. Darwin defined natural selection as the </u>

<u>"principle by which each slight variation, if useful, is preserved."</u>

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What is the term for a group of atoms held together by covalent bonds and having an overall positive or negative charge?

madam [21]

Polyatomic ion: a covalently bonded group of atoms that has a positive or negative charge and acts as a unit.

5 0

3 years ago

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Suppose you need 0.12L of a 0.13M solution of NiCl2, but all you have is a solution that is a solution that is 0.23M. What volum

topjm [15]

- 0.05 L needs to be added to the original 0.12 L solution in order to dilute it from 0.13 M to 0.23 M.

The dilution problem uses the equation :

$M_aV_a= M_bV_b$

The initial molarity (concentration) $M_a =$ 0.13 M

The initial volume $V_a$ = 0.12 L

The desired molarity (concentration) $M_b$ = 0.23 M

The volume of the desired solution $V_b$ = ( 0.12 + x L )

Substituting values in above equation;

(0.13 M ) (0.12 L) = (0.23 M ) (0.12 L + x L)

0.0156 M L = 0.0276 M L + 0.23 x M L

- 0.012 M L = 0.23 x M L

x = - 0.05

Therefore, - 0.05 L needs to be added to the original 0.12 L solution in order to dilute it from 0.13 M to 0.23 M.

Learn more about molarity here:

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2 years ago

Which correct answer is it?

nordsb [41]

C. because i take college classes and I've did this before

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3 years ago

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How many atoms are in 1.4 moles of H3PO4?

sdas [7]

<h3>Answer:</h3>

8.4 × 10²³ atoms H₃PO₄

<h3>General Formulas and Concepts:</h3>

<u>Pre-Algebra</u>

Order of Operations: BPEMDAS

Brackets
Parenthesis
Exponents
Multiplication
Division
Addition
Subtraction

Left to Right<u> </u>

<u>Chemistry</u>

<u>Atomic Structure</u>

Moles
Avogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.

<u>Stoichiometry</u>

Using Dimensional Analysis

<h3>Explanation:</h3>

<u>Step 1: Define</u>

[Given] 1.4 moles H₃PO₄

[Solve] atoms H₃PO₄

<u>Step 2: Identify Conversions</u>

Avogadro's Number

<u>Step 3: Convert</u>

[DA] Set up: $\displaystyle 1.4 \ mol \ H_3PO_4(\frac{6.022 \cdot 10^{23} \ atoms \ H_3PO_4}{1 \ mol \ H_3PO_4})$
[DA] Multiply [Cancel out units]: $\displaystyle 8.4308 \cdot 10^{23} \ atoms \ H_3PO_4$