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Answer:

A chemical equation is the symbolic representation of a chemical reaction in the form of symbols and formula. (i) It must refer to an actual chemical reaction. (ii) It should be molecular. For example, H, O, N should be written as H2, O2, N2. (iii) It should be balanced and conform to the law of conservation of matter.A chemical equation conveys both qualitative and quantitative information. Qualitatively, a chemical equation tells the names of the various reactants and the products.

Answer:

The answer is C

Can you put a brainliest for me

Explanation:

Answer:

the wavelength becomes shorter

Explanation:

frequency increases, the wavelength gets shorter. As the frequency decreases, the wavelength gets longer.

Answer:

mezcla homogénea

Answer:

heterogeneous mixture

Explanation:

you can split the mixture easily with you hands while homogeneous mixtures is dissolved

Answer:

The collision theory states that a chemical reaction can only occur between particles when they collide (hit each other).

hope it helps~

Answer:

because it does not cost much and can be found easily.  due to their low resistance and excellent conductivity.

Explanation:

Answer:

Explanation:  encourage your legislators to support land acquisition programs such as Florida Forever and the Rural and Family Lands Protection Program.

Answer:I found out that it is c

Explanation:Find an answer to your question Determine the amplitude or period as requested. Period of y = 4sin 1/3x a. 4 b. Pi/4 c. 4pi/3 d. 6pi.

I’m sorry no one helped you with those questions. But could you please be a doll and give me the answer for the multiple-choice questions 1-15. Pleaseee I’m so desperate.?

The answer is going to be a nuclear reactor

Answer:

The conjugate base of a very weak acid is stronger than the conjugate base of a strong acid.  

Explanation:

The stronger the acid, the weaker its conjugate base and vice versa  A very weak acid has a very strong conjugate base.

Hope you could get an idea from here.

Doubt clarification - use comment section.

Answer:

The answer of a is 5.45% and b is 3.64%

Explanation:

Density of water = 1 g/mL

∴ Mass of water (solvent) = 500 g

Mass of solute (glucose) = 30 g

Mass of solute (common salt) = 20g

Mass of solution = (30 + 20 + 500) g = 550 g

Mass percentage of solution for glucose

= Mass of solute (gucose)/Mass of solution × 100

= 30/550 x 100

= 5.45 %

Mass percentage of solution for common salt

= Mass of solute (common salt)/Mass of solution × 100

= 20/550 × 100

= 3.64 %

Thus, The answer of a is 5.45% and b is 3.64%

-TheUnknownScientist 72

Answer:

5.45%

and

3.64%

hope it's helpful

Answer:

As a substance changes from a solid to a liquid to a gas, its molecules first the molecules are moving fast enough, they are able to "escape." They leave the surface of the liquid as gas molecules. Evaporation is not the only process that can change a substance from a liquid to a gas. The same change can occur through boiling.

Explanation:

hopfully this helps!

Answer:

#1 is C, #2 is D, #3 is A

Explanation:

Answer:

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Explanation:

The  concentration   of  hydroxide ion  (-OH)  in  1.37 x10^-5 m solution  of Ba(OH)2  is  calculated  as   follows

write   the  equation  for  dissociation  of Ba(OH)2

Ba(OH)2 =  Ba^2+(aq)   + 2OH^-(aq)

by use  of  mole  ratio between Ba(OH)2 to OH^-  which   is  1:2  the   concentration  of OH^-  =  2x  ( 1.37 x10^-5) = 2.74  x10^-5 M

Answer: They are arranged by atomic number.

Answer:

It basically depends upon the pH value of that acid or Base. That's how you can determine whether the substance is a strong or weak acid/base. We have a pH scale ranging from 1 to 14, where 7 is the neutral point. Any substance having a pH of 7 means it is neither an acid nor a Base, but neutral in nature, such as water([tex]H_{2}O[/tex]). Now, if the pH is less than 7, the substance is an acid, similarly if the pH is more than 7, it is a base. As the pH DECREASES, the substance becomes more acidic, on the other hand as the pH INCREASES, the substance becomes more basic. This way you can compare between pH values of two substances and tell which one is stronger or weaker.

For Acids:

If a substance's pH is between 1 and 7 it is an acid. If it is more towards 1, it's a strong acid and if it's more towards 7 it is a weak acid.

For Bases:

If a substance's pH is between 7 and 14 it is a base. If it is more towards 14, it's a strong base and if it's more towards 7 it is a weak base.

Hope that helps...

Answer:

B. Fission

Explanation:

On edge

Astrobiologist means someone who studies the possibilities of life beyond earth. what would YOU do to search for life? They're asking for your opinion :)

Explanation:

It has to be C, because Carbon can bond with four other atoms and is like a four-hole wheel.

(Sorry if my elplanation was kinds choppy Oof, helpfully it makes sense?)

Answer:

group 3 and 12 alkali and alkaline earth metal

Answer: Ammonia, an alkaline chemical, is used to raise the pH level (it's levels of acidity) of our hair during the colouring process. This then lifts the cuticles of the hair fibre and allows the colour to be deposited onto the cortex (the inner part of the hair protected by the cuticles). In hair coloring products, ammonium hydroxide is used to support the lightening action of hydrogen peroxide and to prepare hair to accept color pigments. Alkaline properties of ammonia raise the cuticle and allow peroxide and dye molecules to penetrate the hair shaft. (creds to the internet)

Explanation: Hope this helps! :D

Answer: Zinc nitride (Zn3N2) is an inorganic compound of zinc and nitrogen, usually obtained as (blue)grey crystals. It is a semiconductor. In pure form, it has the anti-bixbyite structure.

Chemical formula: Zn3N2

Space group: Ia-3, No. 206

EC Number: 215-207-3

Appearance: blue-gray cubic crystals

Explanation:

We are given that–

[tex]\qquad[/tex]________________________

As we know –

[tex]\qquad[/tex][tex] \pink{\bf\longrightarrow {Mass = Volume \times Density } }[/tex]

[tex]\qquad[/tex][tex] \bf\longrightarrow Mass_{(Propane)} = 389 \times 19.3 [/tex]

[tex]\qquad[/tex][tex] \bf\longrightarrow Mass_{(Propane)} = 7507.7 \: g[/tex]

[tex]\qquad[/tex]______________________

Mass of a substance is the amount of the constituting particles per unit volume. The mass of the [tex]\bold { 389\ cm^3}[/tex] of propane is 7.507 kg.

Mass of a substance is the amount of the constituting particles per unit volume. It is measured in kilograms (kg).

The formula for mass,

M =  v x d

Where,

M - mass

v - volume = [tex]\bold { 389\ cm^3}[/tex]

d - density = 19.3 g/cm

Put the values in the formula,

M =  [tex]\bold { 389\ cm^3}[/tex]  x   19.3 g/cm

M = 7507.7 g

M  = 7.507 kg

Therefore, the mass of the [tex]\bold { 389\ cm^3}[/tex] of propane is 7.507 kg.

To know more about density,

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The molecular formula of the compound is C6H12O6.

1) We know that;

1 mole of CO2 contains 6.02 X 10^23 atoms

x moles of CO2 contains 1.5 X 10^23 atoms

x = 1 mole X  1.5 X 10^23 atoms /6.02 X 10^23 atoms

x = 0.25  moles of CO2

2) 1 mole of pure Al has 27 g

x moles of Al has 5 g

x = 1 mole ×  5 g/ 27 g

x = 0.19 moles

If 1 mole of Al contains 6.02 X 10^23 atoms

0.19 moles of Al contains 0.19 moles  ×  6.02 X 10^23 atoms /1 mole

= 1.14 X 10^23 atoms

3) From 2Na + Cl2 ---> 2NaCl;

2 moles of Na produces 2 moles of NaCl hence 3 moles of Na will also produce 3 moles of NaCl.

4) The molar mass of K2SO4 is obtained from;

2(39) + 32 + 4(16) = 78 + 32 + 64 = 174 g/mol

Now;

Percentage by mass of K = 2(39)/ 174  ×  100/1 = 44.8%

Percentage by mass of S = 32/174 ×  100/1 = 18.4%

Percentage by mass of O = 4(16)/174 ×  100/1 = 36.8%

5) The reaction equation is;

4Al(s) + 3O2(g) ----> 2Al2O3

Total mass present =  162g + 144g = 306 g

Mass percent of Al =  162g/ 306 g ×  100/1 =52.9%

6)

C - 40/12     H -  6.71/1        O - 53.29/16

C - 3.33      H - 6.71            O - 3.33

Dividing through by the lowest ratio

C- 3.33/3.33     H - 6.71/3.33    O - 3.33/3.33

C - 1                  H - 2                 O - 1

The empirical formula is CH2O

Now;

[12 + 2(1) + 16] n = 180.16

30n = 180.16

n = 180.16/30

n = 6

The molecular formula is C6H12O6.

Learn more about molecular formula: https://brainly.com/question/11588623

Answer:

here you go

Explanation:

someone help me on this but i still got a hundred