HELP ME SLOVE RN IT IS FOR CHEM

Answer:

2KCl + F₂   →     2KF + Cl₂

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

This law was given by French chemist  Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

2KCl + F₂   →     2KF + Cl₂

In this equation mass of reactant and product is equal. There are 2 potassium 2 chlorine and fluorine atoms on both side of equation it means mass remain conserved.

All other options are incorrect because mass is not conserved.

Answer:

A

Explanation:

Sana makatulong tong answer ko

The total number of molecules in 34.0 g of ammonia is equal to 12.044×10[tex]^23[/tex] molecules according to the concept of Avogadro's number.

Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.

It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .

According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.

Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.

In the given example,number of molecules is determined as follows,

17 g ammonia has 6.022×10²³ molecules

So,34 g ammonia has, 34×6.022×10²³/17=12.044×10²³ molecules.

Hence, the total number of molecules in 34 g of ammonia is 12.044×10²³ molecules.

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Your question is incomplete, but the most probable answer is 12.044×10²³ molecules.

Answer:

The cell wall and chloroplasts are essential for autotrophic processes, basically allowing plant life to thrive off of self-made nutrients/food. This is why they are only in plant cells.

Centriole:Anatomically, animal cells have them and plant cells don't have them. Centrioles direct the movement of chromosomes during cell division, but plant cells don't need this since they use photosynthesis.

Explanation:

Answer:

15.24× 10²³ atoms

Explanation:

Given data:

Number of atoms of sodium = ?

Number of moles = 2.53 mol

Solution:

The given problem will solve by using Avogadro number.

The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

2.53 mol × 6.022 × 10²³ atoms / 1mol

15.24× 10²³ atoms

Avogadro number:

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.

Answer:

MM = 12 + 8 + 16 = 36u

Answer:

The alcohol is a primary alcohol.

Explanation:

Chromic acid oxidizes primary alcohols to carboxylic acids and secondary alcohols to ketones but does not react with tertiary alcohols under mild conditions. Therefore, from the Chromic acid test, the class of alcohol is either primary or secondary.

Lucas reagent (a solution of anhydrous ZnCl₂ in conc. HCl)

Primary alcohols do not react readily at room temperature with the Lucas reagent, secondary alcohols react after some minutes while tertiary alcohols react immediately.

Since the alcohol is oxidized by chromic acid and does not react with Lucas reagent, it is a primary alcohol.

A solution of anhydrous zinc chloride in hydrochloric acid is called the Lucas reagent. The alcohol that does not react with Lucas's reagent is a primary alcohol.

The primary alcohol is the compounds that have their hydroxy group (-OH) attached to the primary carbon atom. Its molecular formula is, [tex]\rm CH_{2}OH[/tex].

The hydroxyl carbon of the primary alcohol contains only one R group in its structure. Methanol and ethanol are examples of primary alcohol.

Primary alcohol does not react with Lucas's reagent and no turbidity is formed as carbocation of the primary alcohol is too unstable.

Therefore, primary alcohol does not react with Lucas reagent.

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Answer:

The compound of the formula is Sodium triphosphate.

Explanation:

Answer:

1930g

Explanation:

We have been given that the salinity of sea water is 3.5%;

  Now the mass of sea water sample is 2000g

So, problem here is to find the quantity of pure water in the sample = ?

Solution:

Let us find the quantity of the salt in the sample;

       Salt content  = 3.5% x 2000  = 70g

Amount of pure water  = 2000 - 70 = 1930g

Answer:

The mass of ammonium nitrate that has the same number of nitrogen atoms is 5077.5 g.

Explanation:

To calculate the mass of ammonium nitrate we need to find the number of atoms in liquid nitrogen, as follows:

[tex]d_{N} = \frac{m_{N}}{V}[/tex]

Where:

[tex]d_{N}[/tex]: is the density of liquid nitrogen = 0.808 g/mL

[tex]m_{N}[/tex]: is the mass of liquid nitrogen

V: is the volume of liquid nitrogen = 2.2 L

By calculating the mass of liquid nitrogen we can find the number of atoms:

[tex]m_{N}=d_{N}*V = 0.808 g/mL*\frac{1000 mL}{1 L}*2.2 L=1777.6 g[/tex]

[tex]n = N_{A}*\eta_{N}[/tex]

[tex]n=N_{A}*\frac{m_{N}}{M_{N}}[/tex]

Where:                

[tex]N_{A}[/tex]: is the Avogadro's number = 6.022x10²³ atoms/mol

n: is the number of atoms of liquid nitrogen

[tex]\eta_{N}[/tex]: is the number of moles of liquid nitrogen  

[tex]M_{N}[/tex]: is the molar mass of liquid nitrogen = 28.014 g/mol

[tex]n = \frac{6.022 \cdot 10^{23} atoms}{1 mol}*\frac{1777.6 g}{28.014 g/mol} = 3.82 \cdot 10^{25} atoms[/tex]

Finally, the mass of ammonium nitrate is:

[tex]m_{NH_{4}NO_{3}} = \frac{n*M_{NH_{4}NO_{3}}}{N_{A}}[/tex]

Where:

[tex]M_{NH_{4}NO_{3}}[/tex]: is the molar mass of ammonium nitrate = 80.043 g/mol

[tex] m_{NH_{4}NO_{3}} = \frac{3.82 \cdot 10^{25} atoms*80.043 g/mol}{6.022 \cdot 10^{23} atoms/mol} = 5077.5 g [/tex]

Hence, the mass of ammonium nitrate that has the same number of nitrogen atoms is 5077.5 g.

I hope it helps you!                                                            

Answer:

2.48 g

Explanation:

From the question given above, the following data were obtained:

Number of atoms = 2.53×10³⁴ atoms

Mass of Ni =?

From Avogadro's hypothesis,

we understood that 1 mole of any substance contains 6.02×10²³ atoms.

Therefore, 1 mole of Ni contains 6.02×10²³ atoms.

Recall:

1 mole Ni = 59 g

Therefore, 59 g of Ni contains 6.02×10²³ atoms.

Finally, we shall determine the mass of 2.53×10³⁴ atoms of Ni. This can be obtained as follow:

6.02×10²³ atoms = 59 g

Therefore,

2.53×10³⁴ = 2.53×10³⁴ × 59 / 6.02×10²³

2.53×10³⁴ atoms = 2.48 g

Thus, the mass of 2.53×10³⁴ atoms of Ni is 2.48 g.

Sample cost = $15.796

Given

Mass = 2 g

Density = 0.718 g/ml

Cost =  $5.67 per mL

Required

Cost

Solution

The density : the ratio of mass and volume

Can be formulated :

Density (ρ) = m : V

The volume of the liquid :

V = m : ρ

V = 2 g : 0.718 g/ml

V = 2.786 ml

Sample cost :

= 2.786 ml x $5.67/ml

= $15.796

The density of hydrogen : ρ = 0.0892 g/L

Given

mass of Hydrogen : 0.446 g

Volume = 5 L

Required

The density

Solution

Density is a quantity derived from the mass and volume  

Density is the ratio of mass per unit volume  

The unit of density can be expressed in g/cm³, kg/m³, or g/L

Density formula:  

[tex]\large {\boxed {\bold {\rho ~ = ~ \frac {m} {V}}}}[/tex]

Input the value :

ρ = m : V

ρ = 0.446 g : 5 L

ρ = 0.0892 g/L

Answer:

SOCl2, Mg, CH3CHO, H3O^+

Explanation:

The reaction of the 2,2-dimethylpropan-1-ol  with SOCl2 converts the alcohol to an alkyl halide. This now reacts with Mg metal to yield a Grignard reagent.

The Grignard reagent reacts with CH3CHO and acid  to yield  4,4-dimethylpentan-2-ol as shown in the image attached to this answer.

Answer:

70.2 grams

Explanation:

The formula for density is p = m/V.

Here, p (density) and V (volume) are already given.

So, modify the formula to: m = pV.

p is 7.8 g/cm³, and V is 9 cm³.

m = 39/5 * 9/1

m = 351/5

m = 70.2 grams

The mass of the object is 70.2 grams.

Answer:

2. Na1 +

Explanation:

The formular for sodium fluoride is; NaF

The metal in sodium flouride is sodium.

Sodium belongs to group 1, hence would lose one electron when forming ions.

This is represented as;

Na+

The number of electrons is revealed by the atomic number. This indicates that an aluminum atom contains 13 electrons. Eight electrons make up shell 1, eight electrons make up shell 2, and three electrons make up shell 3. The correct option is C.

Each subsequent shell that surrounds the nucleus of an atom's electrons is placed farther away from the nucleus. Atomic orbitals make up one or more of the one or more subshells that make up an electron shell.

The first two electrons in aluminum fall into the 1s orbital, followed by the next two electrons into the 2s orbital. The following six electrons complete the second shell's 2p orbital. The 3s orbital is then filled by electrons 11 and 12. The 3p orbital is now occupied by the final electron.

Thus the correct option is C.

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Answer:

0.67 g

Explanation:

We know that 1 mole of an element is 6.02 x 10^(23) atoms

Now, arsenic has 5.49 × 10²¹ atoms

Thus;

Number of moles of arsenic = 5.49 × 10²¹ × 1/6.02 x 10^(23) = 9 × 10^(-3) moles

We are told that;

one mole of arsenic = 74.92 g.

Thus, 9 × 10^(-3) moles = 9 × 10^(-3) × 74.92/1 = 0.67428 g ≈ 0.67 g

Answer:

1 g/mL.

Explanation:

From the question given above, the following data were obtained:

Volume = 100 mL

Mass = 100 g

Density =?

Density of a substance is simply defined as the mass of the substance per unit volume of the substance. The density can be expressed mathematically as:

Density (D) = mass (m) / volume (V)

D = m / V

With the above formula, we can obtain the density of the liquid as follow:

Volume (V) = 100 mL

Mass (m) = 100 g

Density (D) =?

D = m / V

D = 100 / 100

D = 1 g/mL

Thus, the density of the liquid is 1 g/mL

Answer:

the water.

Explanation:

well the water makes things look larger than due to ( the surface of a water drop curves outwards to make a dome. this outward or convex, curature light rays inward. the result is an enlarge ment image on the eye. / makes it look larger) + more mass.

Answer:

fr

Explanation:

Answer:

A. Protists

C. Animals

Explanation:

Eukarya are protists, plants, animals, and fungi. Hope it helped!

The correct answers are A and C.

Eukarya are one of the three domains in which current biological science divides life. Eukarya are all organisms in which each cell contains a nucleus.

Eukarya, in addition to many unicellular species, include all types of multicellular organisms. Multicellular organisms are made up of different, specific cell types that make up different tissues.  

The largest group of organisms within eukarya are the protists. These are all single-celled organisms with a eukaryotic cell structure. The protists show a great diversity of species and, except for having a cell nucleus, show little similarity or relationship with each other. In addition, all multicellular organisms such as plants, animals and fungi are eukaryotes.

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Answer:

im pretty sure its "An echo"

Explanation:

Answer: An echo

Explanation:

it's very much correct

Answer:

c. 12

Explanation:

Oxygen has six valance electrons

Silicon has six valance electrons

There are a number of possible atomic numbers but all come from the VI A group of elements.

so i think that is your answer base on the statement given above hope that helps thanx

Answer:

MgBr₂

Explanation:

The given ions are:

             Mg²⁺    and   Br⁻

To find the formula of the compound that will result, we use the combining power or valency approach.

The combining power is the number of electrons usually lost or gained or shared by atoms of elements during the chemical combination.

                                           Mg²⁺    and   Br⁻

combining  power                2                  1

exchange of valencies        1                    2

 Molecular formula is given as  MgBr₂

Answer:

metals, non-metals

Explanation:

Ionic bonding results from electron transfer. To form this bond type, metals lose electrons and becomes positive ions. While non-metals gain electrons to become negatively charged.

CO diffuses more rapidly as compared to CO₂.

Diffusion is the movement of a substance from an area of high concentration to an area of low concentration. The process of diffusion  happens more rapidly in gases and liquids as compared to solids because their particles can move randomly.

The gases spread in the entire space available to them and intermix together even against gravity.

The Graham's law of diffusion states that the rates of diffusion of the gases are inversely proportional to the square root of their molar masses under same temperature and pressure.

Therefore, CO diffuses more rapidly as compared to CO₂.

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Answer:

natural selection

Explanation:

natural selection

Answer:

There is no graph

Explanation: