Chemistry Middle School

Needed to make one s'more: 2 graham crackers, 3 squares of milk chocolate, and 2 marshmallows.
Maddie and her friends are making s'mores over the campfire. they have a bag of 48 marshmallows, 2 packs of graham crackers containing 16 grahams per pack, and 5 chocolate bars that can each be broken into 15 pieces. if maddie's group wants to make s' mores for all, how many can they make and what is the limiting reactant?

Answers

Answer 1

Answer:

15

Explanation:

Related Questions

A sample of oxygen gas has a volume of 45.8 mL when its pressure is 0.492 atm. What
will the volume of the gas be at a pressure of 0.954 atmospheres, if the temperature
remains constant?
Select one:
O a. 23.6
Ob. 0.0102
O c. 88.8
O d. 0.0113

Answers

Answer:

a. 23.6

Explanation:

[tex]P_1=0.492\:atm\\V_1 = 45.8\:ml\\V_2 = ?\\P_1 = 0.954\:atm\\\\Boyle's Law = P_1V_1 = P_2V_2\\\\Lets \:make\: V \:subject\:of\:the\:formula\\\\\frac{P_1V_1}{P_2} = \frac{P_2V_2}{P_2} \\ \\V_2 =\frac{P_1V_1}{P_2} \\V_2 = \frac{0.492\times45.8}{0.954}\\ \\V_2 = \frac{22.5336}{0.954} \\\\V_2 = 23.620\\\\V_2 = 23.6[/tex]

the answer should be 23.6

Which of the following chemical equations depicts a balanced chemical
equation?
O A. AgNO3 + K2 CrO4- > KNO3 + Ag2Cr04
B. 3AgNO3 + 2K2 CrO4- > 3KNO3 + 2Ag2 CrO4
OC. 2AgNO3 + K2 CrO4- > 2KNO3 + Ag2Cr04
OD. AgNO3 + K2 CrO4- > 2KNO3 + Ag2Cr04
Reset Selection

Answers

OC. (Third one) is balanced

The balanced chemical equation is [tex]2AgNO_{3} + K_{2} CrO_{4}[/tex] → [tex]2KNO_{3} + Ag_{2} CrO_{4}[/tex].

What is a balanced chemical equation?

An equation that has the same quantity and type of atom on both ends of the arrow was seen to represent a balanced chemical reaction. A chemical reaction would be represented symbolically in writing by a chemical equation.

The balanced chemical equation is  [tex]2AgNO_{3} + K_{2} CrO_{4}[/tex] → [tex]2KNO_{3} + Ag_{2} CrO_{4}[/tex].

It can be seen that,

The number of Ag molecules on the reactant side is 2.

The number of Ag molecules on the reactant side is 2.

The number of K molecules on the reactant side is 2.

The number of K molecules on the reactant side is 2.

The balanced chemical equation is [tex]2AgNO_{3} + K_{2} CrO_{4}[/tex] → [tex]2KNO_{3} + Ag_{2} CrO_{4}[/tex].

Therefore, the correct answer will be an option (C).

To know more about the balanced chemical equation.

https://brainly.com/question/15052184

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What kind of matter is smoke? A. solution B. suspension C. colloid D. compound E. molecule

Answers

Answer:

C. colloid

Explanation:

Smoke is a collection of tiny solid, liquid and gas particles. Although smoke can contain hundreds of different chemicals and fumes, visible smoke is mostly carbon (soot), tar, oils and ash. Smoke is a collection of tiny solid, liquid and gas particles.

Answer:

C. Colloid

Explanation:

Edmentum/Plato (just took the test its 100% correct)

The analogy that forms the basis of the octet rule compares covalent valence

electron arrangements to:

a. sigma and pi bonds.

b. orbital overlap electron densities.

c. noble gas electron configurations.

d. the hydrogen molecule.

Answers

it is b. orbital overlap electron densities

The analogy that forms the basis of the octet rule compares covalent valence electron arrangements to orbital overlap electron densities.

What is orbital ?

An atomic orbital is a function that describes the position and wave-like activity of an electron in an atom in terms of both atomic theory and quantum mechanics.

This function may be used to determine the likelihood of discovering any atom's electron in any certain area surrounding the nucleus.

The nucleus is the center of the orbits. One orbital will be larger than the others if an atom has several orbitals, or they will overlap. Additionally, an electron is most likely to be found in the orbitals.

An atomic Orbitals are centred around the nucleus. If an atom has many orbitals, either one orbital is bigger than the others or they overlap.

Thus, option B is correct.

To learn more about orbital follow the link below;

https://brainly.com/question/14649495

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What is the molality of a solution that contains 418.8 g HCl in 4.62 kg water?
Select one:
O a 2.49
Ob. 0.00249
Oc. 15.3
Od.4.19e5

Answers

Answer:

a 2.49

Explanation:

Molality is a measure of concentration of solution which describes the number of moles of solute per kilograms of the solvent.

Molality (M) = number of moles of solute (n) / kg solvent

According to the question; mass of solute (HCl) = 418.8g, mass of solvent (water) = 4.62kg

To find the number of moles (n) of solute (HCl), we use; mass (g) / molar mass (g/mol)

Molar mass of HCl = 1 + 35.5 = 36.5g/mol

Hence, n= 418.8/36.5

n= 11.4739

n= 11.5

Therefore, Molality= 11.5 mol of HCl / 4.62kg of water

M= 11.5/4.62

M= 2.489

Hence, molality of the solution is 2.49

the answer is a 2.49

If NaCl dissolves in water. Which of the following is true when considering that water is polar and the
hydrogen (Mickey Mouse Ears) are partially positively charged and the oxygen is partially negatively
charged

Answers

Answer:

oxygen is partially negatively charged

Explanation:

Oxygen is negatively charged

What is the percent yield of lithium hydroxide from a reaction of 7.40g of lithium with 10.2g of water? The actual yield was measured to be 12.1g.

Answers

Answer:

[tex]\boxed{Percentage \ Yield = 47.6 \ percent}[/tex]

Explanation:

The balanced chemical reaction is

[tex]2Li + 2H_{2}O \ \ \ -> \ \ \ 2LiOH + H_{2}[/tex]

For the balanced reaction, we've

Lithium = 14 g

Water = 36 g

LiOH = 48 g

Hydrogen gas = 2 g

So,

14 g of lithium = 48 g of lithium hydroxide

And we have:

7.40 g of lithium = x grams of lithium hydroxide

Cross Multiplying,

x grams = [tex]\frac{48*7.4}{14}[/tex]

Grams of lithium = 25.4 g of lithium hydroxide

So, Theoretical Yield = 25.4 g of lithium hydroxide

Now, The %age yield:

%age Yield = [tex]\frac{Actual \ Yield}{Theoretical \ Yeild } * 100[/tex]

%age Yield = [tex]\frac{12.1}{25.4} * 100[/tex]

%age Yield = 47.6%

Mr. Avogadro has 20 grams of radioactive Pa-234. How many atoms of Pa-234 does Mr. Avogadro have? PLEASE HELP WILL MARK BRAINLIEST!!

Answers

Answer:

The number of atoms in 20 grams of Pa-234 is 5.14 ×10²² atoms

Explanation:

Given that the molar mass of Pa-234 (protactinium) is 234.04331, we have

The number of moles of protactinium in 20 grams of Pa-234, we have

Number of moles = Mass/(Molar mass) = 20/234.04331 = 0.0855 moles

One mole of Pa-234 contains 6.02×10²³ atoms, therefore, we have;

0.0855 moles of Pa-234 contains 0.0855× 6.02×10²³  = 5.14 ×10²² atoms

Therefore, the number of atoms in 20 grams of Pa-234 = 5.14 ×10²² atoms.

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