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Leni [432]
3 years ago
14

Help on this question!

Chemistry
2 answers:
Ira Lisetskai [31]3 years ago
8 0

Answer:

true

Explanation:

cause im smart

enyata [817]3 years ago
6 0

Answer:

True, The Answer is true. Mechanical digestion involves physically breaking the food into smaller pieces.

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A photon has a wavelength of 6.2 meters. Calculate the energy of the photon in joules. (Planck's constant is 6.626 × 10-34 joule
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Wavelength = (planck’s constant) (speed of light) / Energy

6.2 (Energy) = (6.63 •10^-34) (3•10^8)

1.989•10^-25 / 6.2 =

3.2081 • 10^-26 is the answer
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Select the steps that are associated with energy entering the system. Check all that apply.
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Answer: option c. the mixing of solute and solvent molecules

Explanation:

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3 years ago
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What is the molarity of a solution made by mixing 75.0 mL of 3.00 M NH₄OH with enough water to give 250. mL of solution?
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Answer:

Mass 1=3M

Mass 2=?

Volume1=75mL

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By using molarity formula:

<u>mass1*volume 1=mass2*volume 2</u>

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mass2=225/250

mass2:0.9M

<h3>the molarity of a solution is 0.9M.</h3>
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3 years ago
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1. Which category of organisms contains heterotrophic eukaryotes that can reproduce
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3 years ago
Balance the following reaction. A coefficient of "1" is understood. Choose option "blank" for the correct answer if the coeffici
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Answer : To balance a chemical equation you need to find the same number of molecules on both the sides of the reaction.

Here in the reaction ;

KI + Pb (NO_{3})_{2}----\ \textgreater \  Pb I_{2} + KNO_{3}

here we can see that I is not balanced so we need to balance that,
also nitrate is unbalanced we need to work on that as well.

so on solving we get,
2KI + Pb (NO_{3})_{2}----\ \textgreater \ Pb I_{2} + 2KNO_{3}

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