Calculate the number of atoms in a 3.68×103 g sample of aluminum.

Answer:

In a chemical reaction the total mass of all the substances taking part in the reaction remains the same. Also, the number of atoms in a reaction remains the same. Mass cannot be created or destroyed in a chemical reaction.

Stoichiometry must be multiplied by the number that is printed on the element's foot in order to determine how many atoms of a certain element there are in a given molecule.  Therefore, the quantity of atoms inside a reaction doesn't change.

Atom is the smallest particle of any element, molecule or compound. Atom can not be further divided. Atoms have a central nucleus and electrons that move in a fixed orbit around it. Protons and neutrons are found in the nucleus. Electron has -1 charge while proton has +1 charge.

The combined mass of all of the components involved in a chemical process stays constant. Additionally, the quantity of atoms inside a reaction doesn't change. Chemical reactions cannot produce or destroy mass.

Therefore, the quantity of atoms inside a reaction doesn't change.

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Answer:

150 seconds

Explanation:

Answer:

an atom and inside the atom are protons electrons and nuetrons

Explanation:

Answer:

An Atom

Explanation:

An atom is the most smallest particle of matter, you can't see with the most powerful telescopes or microscopes

Answer:

The answer is compaction.

Explanation:

Answer:

(a) [tex]\Delta H=-73.1\frac{kJ}{mol}[/tex]

(b) [tex]T_2=38.1\°C[/tex]

(c) Yes, it is appropriated.

Explanation:

Hello.

(a) In this case, given the formation enthalpies for copper (II) sulfate, copper (II) ion and sulfate ion, we can compute the enthalpy change for such process as follows:

[tex]\Delta H=\Delta H_{Cu^{2+}}+\Delta H_{SO_4^{-2}}-\Delta H_{CuSO_4}\\\\\Delta H=64.8-909.3-(-771.4)\\\\\Delta H=-73.1\frac{kJ}{mol}[/tex]

(b) In this case, since 13.0 g of copper (II) sulfate (molar mass: 159.55 g/mol) we can compute the gained heat by water via:

[tex]Q_{water}=-n_{CuSO_4}\Delta H=-13.0g*\frac{1mol}{159.55g}* -73.1\frac{kJ}{mol}\\ \\Q_{water}=5.96kJ=5960J[/tex]

As the heat lost by the reaction is gained by the water, therefore, the final temperature is:

[tex]Q_{water}=m_{water}Cp_{water}(T_2-T_1)\\\\T_2=T_1+\frac{Q_{water}}{m_{water}Cp_{water}}\\ \\T_2=25.0\°C+\frac{5960J}{0.109L*\frac{1000g}{1L}*4.18\frac{J}{g\°C} } \\\\T_2=38.1\°C[/tex]

(c) In this case, since this dissolution reaction is exothermic as it increases the temperature when undergone, we can infer that yes, this dissolution would be appropriate for the preparation of a hot pack, because a cold pack would be with an endothermic dissolution reaction.

Best regards.

Answer: the particles in the water heats up and the hotter to gets the faster it moves. When there is no where for the heat to go it builds up and pushes its way out and turns to steam when it hits cool air

Explanation:

Answer:

Compound is the answer

Answer:

6.976%

0.0152 M

Explanation:

Step 1: Write the balanced chemical equation

Ba²⁺(aq) + H₂SO₄(aq) ⇒ BaSO₄(s) + 2 H⁺(aq)

The balanced net ionic chemical equation is:

Ba²⁺(aq) + SO₄²⁻(aq) ⇒ BaSO₄(s)

Step 2: Calculate the moles corresponding to 0.5376 g of BaSO₄

The molar mass of BaSO₄ is 233.39 g/mol.

0.5376 g × (1 mol/233.39 g) = 2.303 × 10⁻³ mol

Step 3: Calculate the moles of Ba²⁺ that produced 2.303 × 10⁻³ moles of BaSO₄

The molar ratio of Ba²⁺ to BaSO₄ is 1:1. The moles of Ba²⁺ are 1/1 × 2.303 × 10⁻³ mol = 2.303 × 10⁻³ mol.

Step 4: Calculate the mass corresponding to 2.303 × 10⁻³ moles of Ba²⁺

The molar mass of Ba²⁺ is 137.33 g/mol.

2.303 × 10⁻³ mol × 137.33 g/mol = 0.3163 g

Step 5: Calculate the mass percent of barium in the original sample

0.3163 g of barium ion were in a 4.534 g-sample. The mass percent of barium ion is:

0.3163 g/4.534 g × 100% = 6.976%

Step 6: Calculate the molar concentration barium in the 152 mL of solution

2.303 × 10⁻³ moles of barium ion were in 152 mL (0.152 L) of solution. The molarity of barium ion is:

M = 2.303 × 10⁻³ mol/0.152 L = 0.0152 M

Answer:

Na⁺,SO₄²⁻

Explanation:

Sodium sulfate is formed by the sodium and sulfate ion.

Sodium is present in group one thus it has only one valence electron. Sodium lose its one valence electron to get complete octet and thus form cation with +1 charge.

On other hand sulfate ion is an anion it carries -2 charge so when it react with sodium there are two sodium atom combine with one sulfate ion inorder to make the compound neutral.

2Na + SO₄²⁻  →  Na₂SO₄

Sodium sulfate is actually form when sodium react with sulfuric acid and hydrogen gas is liberated.

Chemical equation:

Na + H₂SO₄  →  Na₂SO₄ + H₂

Balance chemical equation:

2Na + H₂SO₄  →  Na₂SO₄ + H₂

Answer:

1 - does not flow easily and is difficult to compress

2 -does not flow easily and is difficult to compress.

3 -has lots of space between the charged particles.

4-flows easily but is difficult to compress.

Explanation:

Answer: The mass of product, [tex]H_2O[/tex] is, 36.0 grams.

Explanation : Given,

Mass of [tex]H_2[/tex] = 4.0 g

Mass of [tex]O_2[/tex] = 32.0 g

Molar mass of [tex]H_2[/tex] = 2 g/mol

Molar mass of [tex]O_2[/tex] = 32 g/mol

First we have to calculate the moles of [tex]H_2[/tex] and [tex]O_2[/tex].

[tex]\text{Moles of }H_2=\frac{\text{Given mass }H_2}{\text{Molar mass }H_2}[/tex]

[tex]\text{Moles of }H_2=\frac{4.0g}{2g/mol}=2.0mol[/tex]

and,

[tex]\text{Moles of }O_2=\frac{\text{Given mass }O_2}{\text{Molar mass }O_2}[/tex]

[tex]\text{Moles of }O_2=\frac{32.0g}{32g/mol}=1.0mol[/tex]

Now we have to calculate the limiting and excess reagent.

The balanced chemical equation is:

[tex]2H_2+O_2\rightarrow 2H_2O[/tex]

From the balanced reaction we conclude that

2 mole of [tex]H_2[/tex] react with 1 mole of [tex]O_2[/tex]

From this we conclude that, there is no limiting and excess reagent.

Now we have to calculate the moles of [tex]H_2O[/tex]

From the reaction, we conclude that

2 moles of [tex]H_2[/tex] react to give 2 moles of [tex]H_2O[/tex]

Now we have to calculate the mass of [tex]H_2O[/tex]

[tex]\text{ Mass of }H_2O=\text{ Moles of }H_2O\times \text{ Molar mass of }H_2O[/tex]

Molar mass of [tex]H_2O[/tex] = 18 g/mole

[tex]\text{ Mass of }H_2O=(2.0moles)\times (18g/mole)=36.0g[/tex]

Therefore, the mass of product, [tex]H_2O[/tex] is, 36.0 grams.

Answer:

the answer is 18,927,06.

Explanation:

I just took the test ; )

Answer:

39270 J

Explanation:

The quantity of heat required to raise the temperature of a substance from its initial temperature to its final temperature is given by:

Q = mCΔT

m = mass of substance, C = specific heat capacity of substance, ΔT = temperature change = final temperature - initial temperature

Melting point = 0°C, boiling point = 100°C, m = 93.5 g = 0.0935 g, ΔT = boiling point - melting point = 100 - 0 = 100°C, C = 4200 J/kg°C

Q = mCΔT

Q = 0.0935 × 4200 × 100 = 39270 J

Answer:

B?

Explanation:

Answer: Na2HPO4

Explanation: this is the formula

Answer:

Na3PO4

Explanation:.

Answer:

1 × 10⁻² M

Explanation:

Step 1: Given data

Absorptivity of a dye (ε): 1 × 10² cm⁻¹M⁻¹

Absorbance (A): 1.0

Length of the cuvette (l): 1 cm

Concentration of a dye (C): ?

Step 2: Calculate the concentration of the dye

We will use Beer's Law.

A = ε × l × C

C = A / ε × l

C = 1.0 / 1 × 10² cm⁻¹M⁻¹ × 1 cm

C = 1 × 10⁻² M

The concentration of the dye is 1 × 10⁻² M.

Answer:

Which type of precipitation freezes when it comes into contact with a cold surface?  

✔ freezing rain

Which type of precipitation is round pellets of ice more than 5 millimeters in diameter?  

✔ hail

Which type of precipitation is water vapor that condenses into ice crystals in clouds?  

✔ snow

Explanation:

The type of precipitation that freezes when it comes into contact with a cold surface is freezing rain.

The type of precipitation that is round pellets of ice more than 5 millimeters in diameter is hail.

The type of precipitation where water vapor condenses into ice crystals in clouds is snow.

Freezing rain is the rain that is maintained at a temperature that's below freezing by ambient air mass. It's made entirely of liquid droplets.

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Answer:

What would be the formal charge of N in NO2?

Explanation:

The nitrogen gets two electrons for the double bond, one from the single bond and one from the half-filled orbital associated with it. That's a total of 4 and gives N a +1 formal charge since itneeds 5 to be neutral. The Rules for Writing Lewis Structures has some discussion of formal charge in it.

Answer:

electron

Explanation:

a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

A compound is a material formed by chemically bonding two or more chemical elements. The type of bond keeping elements in a compound together may vary: covalent bonds and ionic bonds are two common types. The elements are always present in fixed ratios in any compound.

Chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.

is a material made up of two or more different substances which are physically combined.

A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element. I

A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen.

hope this help!

Answer:

Here are the definitions of all of them.

Explanation:

Molecule:

a group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.

Compound:

A compound is a material formed by chemically bonding two or more chemical elements. The type of bond keeping elements in a compound together may vary: covalent bonds and ionic bonds are two common types. The elements are always present in fixed ratios in any compound.

Element:

Chemical element, also called element, any substance that cannot be decomposed into simpler substances by ordinary chemical processes. Elements are the fundamental materials of which all matter is composed.

Mixture:

is a material made up of two or more different substances which are physically combined.

Chemical Formula:

A chemical formula identifies each constituent element by its chemical symbol and indicates the proportionate number of atoms of each element. I

Pure substance:

A substance that has a fixed chemical composition throughout is called a pure substance such as water, air, and nitrogen.

Answer:

Number of moles of C produced =  58.08 mol

Explanation:

Given data:

Mass of sugar = 1745 g

Moles of C produced = ?

Solution:

Chemical equation:

C₆H₁₂O₆  +   6H₂SO₄    →     6C + 6(H₂SO₄.H₂O)

Number of moles of sugar:

Number of moles = mass/molar mass

Number of moles = 1745 g/180.16 g/mol

Number of moles = 9.68 mol

Now we will compare the moles of C and sugar.

                 C₆H₁₂O₆          :           C

                      1                  :           6

                    9.68              :          6×9.68 = 58.08 mol

Number of moles of C produced =  58.08 mol

I know I'm answering super late, but I just want to help others who don't know the answer

Answer:

H. The two elements are in the same group, with Element R just above Element Q.

Explanation:

When answering a question like this, I would highly recommended using a periodic table. I used a periodic table to find the answer to the question.

Answer:

The correct answer is - option C.  I and Ill only.

Explanation:

One never tastes a unknown chemical in chemistry lab especialy a liquid that can be hazardous. Melting test is for solid as a solution is already a liquid state so melting test can not be perform on it.

The two test can be perform on given sample that are color comparison and boiling test to check if it is substance or a mixture. A misture is prepared from mixing different kind of compounds that can give different kind of color  while a particular substance give a uniform color always or remain colorless.

Boiling test can be helpful in distinguish a mixture from a substance as a particular sybstance always give a particular boiling point but mixture can be varry and depend of the coponents mixed together

Answer:

catalase

Explanation:

catalase is enzime the rest are glucides

Hello!

The answer is that they are a source of energy!

Hope this helps!

Answer:

No. of atom =

no.of moles x avagardro's number xatomicity

= weight /molar mass x No x atomicity

=8.2/142 x6.02x10^23 x 4

=0.346 x 10^23(approximately)

Answer AND Explanation: Carbohydrates or sugars have three classes:

Monossaccharides are formed by a chain of unbranched carbon, all bonded  by single bonds, except for a carbon that is double-bonded by an oxygen. This bond form a carbonyl group.

If the carbonyl is at an end of the chain, the carbon is aldehyde and the molecule is called aldose. If the group is in any other position, it is a ketone and is called ketose

So analysing each projection:

1) Carbon one is a aldehyde, which means is a carbonyl and there are no other carbons forming that bond, so it's a ALDOSE

2) Carbon two is attached to a ketone and other carbons aren't, so it's a KETOSE.

3) Carbon one is aldehyde, so it's ALDOSE

4) Carbon one is aldehyde, so ALDOSE

5) Carbon two is attached to ketone, so KETOSE

6) Carbon two attached to a ketone, so KETOSE

Answer:

Method 1 - precision

Method 2 - accuracy

Method 3 - precision

Method 4 - accuracy

Explanation:

The accuracy of a method refers to how close the experimental result is to the accepted value. Accuracy could be checked by carrying out the required test on the standard and not on the sample or by adding a known amount of analyte to the sample so that the results obtained can be carefully compared.

Precision on the other hand, refers to how close the results of a replicate analysis are to each other. In testing for precision, the analysis must be carried out several times, in order to check how close the results are to each other.