Answer this express as a chemical equation

Answer:

simple chemistry experiment—adding baking soda to vinegar—seems to challenge the law of conservation of mass.

Some of the mass escaped from the test tube as a gas before it was massed. Hence option C is correct.

Experiment is defined as a process used to confirm or deny a hypothesis, as well as assess the likelihood or effectiveness of a previously untested idea. Additionally, experiments are used by researchers to confirm or refute new or current theories. The structure or mathematical form of a theory can be hinted at by an experiment, and it can also provide proof that the entities involved in our theories actually exist.

Something new is created when vinegar and baking soda are combined. Carbon dioxide gas soon foams up in the mixture. All of the baking soda can be made to react and dissolve into the vinegar solution if enough vinegar is utilized.

Thus, some of the mass escaped from the test tube as a gas before it was massed. Hence option C is correct.

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Answer:

The couch will not move because the people are not working together. Maybe if they call someone to help they can make some progress.

Answer:

a silly

Explanation:

Answer:

aajajjajajajajajajajajdsjsjjx jajajjajajajajaisjn

Explanation:

Answer:

Explanation:

An atom on a face is shared by two unit cells, so only half of the atom belongs to each of these cells. An atom on an edge is shared by four unit cells, and an atom on a corner is shared by eight unit cells.

Answer:

Some nutrients also act as antioxidants. These may be vitamins, minerals, proteins, or other types of molecules. They help the body remove toxic substances known as free radicals, or reactive oxygen species. If too many of these substances remain in the body, cell damage and disease can result.

The option A describes an exothermic reaction.

i.e, ΔHt,reactant > ΔHt, product

The reaction in which energy is release during the formation of reaction is called exothermic reaction.

Mathematically,

ΔHf = ΔH(product) - ΔH(reactant)

For exothermic reaction, ΔHt,reactant > ΔHt, product

So,for exothermic reaction, ΔHf is negative.

Where,

ΔHf = Enthalpy of formation of reaction

ΔH(product) = enthalpy of formation of product

ΔH(reactant) = enthalpy of formation of reactant

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Answer:

7

Explanation:

just add p has 1 o has 4 and h has 2

Answer:

The empty space between the atomic cloud of an atom and its nucleus is just that: empty space, or vacuum. ... Electrons are thus 'spread out' quite a bit in their orbits about the nucleus. In fact, the wave-functions for electrons in s-orbitals about a nucleus actually extend all the way down into the nucleus itself.

(つ ◕.◕ )つ Hey there again!

Answer → Last one Spreading Plates on the Sea Floor

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Answer:

Option D. Carbon monoxide, 4.56 Moles

Explanation:

The balanced equation for the reaction is given below:

Fe₂O₃ + 3CO —> 2Fe + 3CO₂

From the balanced equation above,

1 mole of Fe₂O₃ reacted with 3 moles of CO to produce 3 moles of CO₂.

1. Determination of the limiting reactant.

From the balanced equation above,

1 mole of Fe₂O₃ reacted with 3 moles of CO.

Therefore, 2.54 moles of Fe₂O₃ will react with = 2.54 × 3 = 7.62 moles of CO.

From the calculation made above, we can see that it will take higher amount of CO (i.e 7.62 moles) than what was given (i.e 4.56 moles) to react completely with 2.54 moles of Fe₂O₃. Therefore, CO is the limiting reactant and Fe₂O₃ is the excess reactant.

2. Determination of the maximum amount of carbon dioxide CO₂ produced.

In this case, the limiting reactant will be used since all of it is consumed by reaction.

The limiting reactant is CO and the maximum amount of CO₂ produced can be obtained as follow:

From the balanced equation above,

3 moles of CO reacted to produce 3 moles of CO₂.

Therefore, 4.56 moles of CO will also react to produce 4.56 moles of CO₂.

Thus, the maximum amount of CO₂ produced is 4.56 moles

Summary:

Limiting reactant => carbon monoxide, CO

Maximum amount of carbon dioxide, CO₂ produced = 4.56 moles

Thus, option D gives the correct answer to the question.

Answer:

0.0225 M

Explanation:

In one liter of this solution, there are 45 mEq of Ca⁺².

1 mEq of Ca⁺² is equal to 20 mg of Ca⁺. We know this by dividing its molar mass (40) by the charge of the ion (2).

Meaning that 45 mEq of Ca⁺² is equal to (45 * 20) 900 mg of Ca⁺².

Now we convert 900 mg of Ca⁺² into moles, using its molar mass:

Finally we calculate the molarity of the solution:

Answer:

The correct answer is that it is made of atoms that are covalently bonded together.

Explanation:

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Answer: The %w/w protein in the sample is 15.2 %

Explanation:

To calculate the number of moles for given molarity, we use the equation:

[tex]\text{Moles of solute}={\text{Molarity of the solution}}\times{\text{Volume of solution (in L)}}[/tex]    

[tex]\text{Moles of} HCl={0.09552\times 50.00}{1000}=0.0047moles[/tex]

[tex]\text{Moles of} NaOH={0.05992\times 37.84}{1000}=0.0023moles[/tex]

[tex]HCl+NaOH\rightarrow NaCl+H_2O[/tex]  

According to stoichiometry :

1 mole of [tex]NaOH[/tex] require 1 mole of [tex]HCl[/tex]

Thus 0.0023 moles of [tex]NaOH[/tex] will require=[tex]\frac{1}{1}\times 0.0023=0.0023moles[/tex]  of [tex]HCl[/tex]

moles of HCl used = (0.0047-0.0023) = 0.0024

[tex]NH_3+HCl\rightarrow NH_4Cl[/tex]

1 mole of HCl uses = 1 mole of ammonia

Thus 0.0024 moles uses = [tex]\frac{1}{1}\times 0.0024=0.0024moles[/tex] of ammonia

Mass of ammonia= [tex]moles\times {\text {Molar mass}}=0.0024\times 17g/mol=0.0408g[/tex]

17 g of ammonia contains = 14 g of Nitrogen

Thus 0.0408 g of ammonia contains = [tex]\frac{14}{17}\times 0.0408=0.034 g[/tex] of Nitrogen

Now 17.45 g of Nitrogen is present in = 100 g of protein

Thus 0.034 g of Nitrogen is present in =[tex]\frac{100}{17.45}\times 0.034=0.195g[/tex] of protein

Now % w/w of protein = [tex]\frac{0.195}{1.2846}\times 100=15.2\%[/tex]

Thus %w/w protein in the sample is 15.2%

If the proteins in grains average 17.54% w/w N, the % w/w protein in the sample is 15.2 %.

It is a process of converting nitrogen present in any compound into ammonium sulfate.

Step1: calculating the moles by the formula of molarity

molarity × volume

M = 0.09552, V =  50.00 mL =0.05 L

Moles of HCl

[tex]0.09552 \times 0.05 = 0.0047\;mol\\[/tex]

Moles of NaOH

[tex]0.05992 \times 0.03784 = 0.0023 \;mol[/tex]

Moles of HCl used is  0.0047 - 0.0023 = 0.0024

Step2: calculating the mass of ammonia

moles × molar mass

[tex]0.024 \times 17\;g/mol = 0.0408\;g[/tex]

Now, 17 grams of ammonia have 14 grams of nitrogen

so, 0.0408 g ammonia have [tex]\dfrac{14}{17} \times 0.0408 = 0.034[/tex]

In 100 g of protein, there is 17.45 g of nitrogen

So, 0.034 g N have [tex]\dfrac{100}{17.45} \times 0.034 = 0.195 g.\\[/tex]

Step3: calculating the % w/w

[tex]\dfrac{0.195}{1.2846} \times 100 = 15.2 \%[/tex]

Thus, the % w/w is 15.2 %

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Answer:

Sugar dissolves in water because energy is given off when the slighty polar sucrose molecules form intermoleeular bonds with the polar water molecules.

Explanation:

Answer:

PORS U N DISOLVENTE ELAGA YU E LAZUCR UAE SOLN TOU

Explanation:

Answer:

2000 (km)

Explanation:

:)

Answer: Metalloids

Explanation:

The dark “stair step” line on the right side of the periodic table is where the metalloids are. Metalloids “touch” the SSL. (Stair step line)

The metals are to the left of the SSL and the non metals are to the right of the SSL.

Answer:

9.95mL is the volume of NaOH that you must use

Explanation:

In the problem, you have in your blanck the presence of an acid as sulfuric acid. That means the blank requires an amount of NaOH to neutraliz its solution.

The volume required for the sample will be:

Volume of the sample - Volume of the blank

Beacuse we don't have to take into account the acidity of the blanck

12.92mL - 2.97mL =

Answer:

I think the answer is A. 1.98 x 10^2 g

Answer:

C.

Explanation:

because the heat From the nickel and the heat from the water are the same.

As a piece of nickel at 25 °C is dropped into a glass of water at 25 °C, there will be no transfer of heat from the nickel to the water in the glass.

To answer the question, we need to know what heat transfer is.

This is the flow of heat energy from one body to another over a temperature gradient.

Since a piece of nickel at 25 °C is dropped into a glass of water at 25 °C, there is no temperature gradient, since, both bodies are at the same temperature. Thus, no heat is transferred from the nickel to the water.

So, as a piece of nickel at 25 °C is dropped into a glass of water at 25 °C, there will be no transfer of heat from the nickel to the water in the glass.

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Answer: Thermal energy refers to the energy contained within a system that is responsible for its temperature. Heat is the flow of thermal energy. ... This energy is usually in the form of low-level thermal energy. Here, low-level means that the temperature associated with the thermal energy is close to that of the environment. hope this helps. Can u pls give me brainliest

Explanation:

~My Answer~:

Water is the enabler of fast oxidation of iron so freshwater will also cause rust. However, salt water is a very good conductor (lots of dissociated ions) and so there are a number of electrolysis reactions that tremendously accelerate corrosion in salt water.

Answer: MCCCMC

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Answer:

Most solids in solution exhibit a general trend of increasing solubility with increasing temperature.

A seed crystal may be added to a supersaturated solution to precipitate excess solute.

Explanation:

For many solids dissolved in liquid water, the solubility increases with temperature. The increase in kinetic energy that comes with higher temperatures allows the solvent molecules to more effectively break apart the solute molecules that are held together by intermolecular attractions(Lumen Learning).

When a seed crystal is added to a supersaturated solution, excess solute begin to precipitate because  the seed crystal now furnishes the required nucleation site where the excess dissolved crystals now begin to grow.

Answer:

52.2 g

Explanation:

Step 1: Write the balanced equation

3 KOH + H₃PO₄ ⟶ K₃PO₄ + 3 H₂O

Step 2: Calculate the moles corresponding to 89.7 g of KOH

The molar mass of KOH is 56.11 g/mol.

89.7 g × 1 mol/56.11 g = 1.60 mol

Step 3: Calculate the moles of H₃PO₄ needed to react with 1.60 moles of KOH

The molar ratio of KOH to H₃PO₄ is 3:1. The moles of H₃PO₄ needed are 1/3 × 1.60 mol = 0.533 mol.

Step 4: Calculate the mass corresponding to 0.533 moles of H₃PO₄

The molar mass of H₃PO₄ is 97.99 g/mol.

0.533 mol × 97.99 g/mol = 52.2 g

Answer:

rough surface

Explanation:

Diffuse reflection occurs when parallel light waves strike a rough surface

Answer:

Rippling fountain

Explanation: