what is the ideal gas constant?
A.it is a constant that applies only at STP
B.it is a specific constant for a specific gas
C.it is constant that depends on the conditions
D.it is a universal constant for all glasses

Answer:

See Explanation

Explanation:

1) Let us recall that;

Mass number = number of protons + number of neutrons

Where;

Number of protons = ?

Number of neutrons =20

Mass number =39

Number of protons = mass number - number of neutrons

Mass of protons =39 - 20= 19 protons

2) Atomic number = 13

Number of neutrons =14

Then the mass number =13 +14 =27

The symbol of the element is 27X13

The number of protons= the number of electrons =13

The atomic number is the same as the proton number =13

Answer:

algabra

Explanation:

air

Answer:

25.8g of NH3 can be formed

Explanation:

To solve this question we must convert the mass of each reactant to moles using molar mass. With the chemical equation we can find limiting reactant. The moles of limiting reactant are used yo find the moles of ammonia produced and its mass:

Moles NO -30.01g/mol-

45.4g * (1mol / 30.01g) = 1.51 moles

Moles H2 -Molar mass: 2.01g/mol-

12.1g * (1mol / 2.01g) = 6.02 moles

For a complete reaction of 6.02 moles of H2 are needed:

6.02mol H2 * (2mol NO / 5mol H2) = 2.41 moles NO are needed

As there are just 1.51 moles, NO is limiting reactant

Moles NH3:

1.51 moles NO * (2mol NH3 / 2mol NO) = 1.51 moles NH3

Mass NH3 -Molar mass: 17.031g/mol-

1.51 moles NH3 * (17.031g / mol) =

Answer:

1..CO3

2..OH

3..CO

4..Cl

5..PO3

6..SO4

8..NO3

9..NO2

1O..I2

Answer:

4.0 moles

Explanation:

Based on the given reaction between carbon and hydrogen, the equation of the reaction between O₂ and CO is as follows:

2CO(g) + O₂(g) → 2CO₂(g)    

The number of moles of O₂ needed to completely react with 8.0 moles of CO can be calculated knowing that 2 moles of CO react with 1 mol of O₂:

[tex] n_{O_{2}} = \frac{1 mol O_{2}}{2 moles CO}*8.0 moles CO = 4.0 moles O_{2} [/tex]

Therefore, the number of moles of O₂ needed is 4.0.

I hope it helps you!          

Answer:

D. Body of salt water that is connected to the ocean

Explanation:

An ocean is a body of salt water which covers approximately 70% of the Earth's surface. About 97% of the Earth's water is comprised of ocean and as such it is the most prominent and defined feature of the Earth. There are basically four (4) categories of an oceanic basin and these are;

1. The Pacific ocean.

2. The Artic ocean.

3. The Atlantic ocean.

4. The Indian ocean.

A sea is usually defined as a body of salt water that is connected to the ocean and are surrounded (enclosed) by land partially.

Basically, a sea is formed where a land and an ocean meet and as a result, an ocean is usually bigger than a sea.

Some examples of seas around the world are Red sea, Mediterranean sea, Sargasso sea, Caribbean sea, Baltic sea, Caspian sea, Chuckchi sea, etc.

Answer:

Yes The Anwer is D Hope This Help:)

Answer:

Your answer ,it is not equal to it

Answer:

2 1 H

Explanation:

We must remember that a nuclear equation is only said to be balanced when the mass and charges on both sides of the nuclear reaction equation correspond.

If we look at the nuclear equation; the total mass on the right hand side is 4 units while the total charge on the right hand side is two units.

This implies that the missing particle must be 2 1 H

Answer:

The producer is the grass, and energy flows from the mouse to both the snake and the owl.

Explanation:

The producer is usually defined as a "Producers, also known as autotrophs, make their own food.". Thus, the grass is the producer of the food web provided.

The energy also flows from the mouse to the snake and the owl, as the mouse has two arrows that lead away from it, leading both to the snake and the owl.

Hope this helps.

Answer:

During separation of substances with different boiling points, fractional distillation is used.

During separation of substances in an eutectic mixture or azeotropic mixture, steam distillation is used.

Answer:

Substance A should be glucose and B is water.

Explanation:

To make it simple

Plants need sunlight, carbon dioxide and water to photosynthesize, to make food and produce oxygen.

Hope that helped :)

Answer:

A

Explanation:

Answer:

10 electrons

Explanation:

Answer:

Mass of copper in 200 g bronze is 120 g.

Explanation:

If it is known that bronze is formed with 60% copper and 40% tin, what will be the mass of copper contained in 200 grams of bronze?

Percentage of copper in bronze = 60 %

Percentage of tin in bronze = 40 %

Mass of bronze  = 200 grams

Mass of copper in bronze = 60 % of 200 g

= 0.6 x 200 = 120 grams

Mass of copper in 200 g bronze is 120 g.  

Answer:

Sorry I want to help but I dont know the answer

Answer:

Explanation:

Nitrogen has a lone pair of electrons. That would mean that NH3 is minus at the left end in this case.

 H

:N  H

H

Methane has its Hs 90 degrees (approximately apart.

    H

H  C  H

    H

The pulling forces on the methane cancel each other out. When that happens the chemical is non polar.

Answer:

240 N/m

Explanation:

Using the formula as follows:

U = ½kx²

Where;

U = elastic potential energy (J)

K = spring constant (N/m)

x = stretched displacement (m)

According to the information provided in this question,

U = 35J

x = 0.54m

k = ?

U = ½kx²

35 = ½ × k × 0.54²

35 = ½ × k × 0.2916

35 = 0.2916k/2

70 = 0.2916k

k = 70 ÷ 0.2916

k = 240.05

To 2s.f, the spring constant (k) = 240 N/m.

Answer: 240

Explanation:

Answer:

[HBr] = 0.0910 M

Explanation:

NaOH → Strong base

HBr → Strong acid.

This is a titration that involves a strong acid and a strong base, so the recaction is about acid base equilibrium.

Formula for titration in the equivalence point is:

mmoles of acid = mmoles of base

M . Volume of acid = M . volume of base

We replace data:

M . 36.60 mL = 0.150 M . 22.20 mL

M = (0.150 M . 22.20 mL) / 36.60 mL

M = 0.0910 mol/L

Answer:

The division used by Isaac Newton, in his color wheel, was: red, orange, yellow, green, blue, indigo and violet; a mnemonic for this order is "Roy G. Biv". Less commonly, "VIBGYOR" is also used for the reverse order. In modern divisions of the spectrum, indigo is often omitted.

Explanation:

D

The object was closest to the color blue on the color spectrum will be sun.

The distinctive wavelengths of given electromagnetic radiation that are released or absorbed by a material, atom, as well as molecule are known as a spectrum.

The perception of color is based on how the human vision reacts to light and how light interacts with objects.

Isaac Newton's color wheel was divided into the following groups: red, orange, yellow, green, blue, indigo, and violet. The acronym "Roy G. Biv" can be used to remember this arrangement. The reverse sequence can also be referred to as "VIBGYOR" less frequently. Indigo is frequently left out of contemporary spectrum divides.

To know more about the spectrum.

https://brainly.com/question/6836691

#SPJ3

Answer:

let me know if it is right:)

and I hope it make sense

Answer:

I think a

explanation

..

Answer: A balanced equation for the  equilibrium reaction where the aqueous bicarbonate ion, [tex]HCO^{-}_{3}(aq)[/tex]; decomposes to  form hydrogen ions, [tex]H^{+}(aq)[/tex] and carbonate ions, [tex]CO^{2-}_{3}[/tex] is [tex]HCO^{-}_{3} \rightleftharpoons H^{+}(aq) + CO^{2-}_{3}[/tex].

Explanation:

A balanced chemical equation is defined as the equation which contains same number of atoms on both reactant and product side.

Hence, balanced equation for the  equilibrium reaction where the aqueous bicarbonate ion, [tex]HCO^{-}_{3}(aq)[/tex]; decomposes to  form hydrogen ions, [tex]H^{+}(aq)[/tex] and carbonate ions, [tex]CO^{2-}_{3}[/tex] is as follows.

[tex]HCO^{-}_{3} \rightleftharpoons H^{+}(aq) + CO^{2-}_{3}[/tex]

Here, number of atoms present on reactant side are as follows.

Number of atoms present on product side are as follows.

Since, there are same number of atoms present  on both reactant and product side. Therefore, this equation is balanced.

Thus, we can conclude that balanced equation for the  equilibrium reaction where the aqueous bicarbonate ion, [tex]HCO^{-}_{3}(aq)[/tex]; decomposes to  form hydrogen ions, [tex]H^{+}(aq)[/tex] and carbonate ions, [tex]CO^{2-}_{3}[/tex] is [tex]HCO^{-}_{3} \rightleftharpoons H^{+}(aq) + CO^{2-}_{3}[/tex].

Answer:

2Na2O (s) → 4Na (s) + O2 (g)

Explanation:

According to this question sodium oxide, Na2O, decomposes to produce oxygen gas, O2, and sodium metal, Na. The following represents the chemical equation;

Na2O (s) → Na (s) + O2 (g)

However, the above chemical equation is not balanced as the number of atoms of each element on both sides are not equal e.g. there are 2 moles of Na on one side and 1 mole on the other.

To balance the equation, we make use of coefficients to ensure that the atoms of each element on the reactant side are the same as that on the product side. The balanced equation is as follows:

2Na2O (s) → 4Na (s) + O2 (g)

Answer:

mitochondria is responsible for energy

Answer:

[tex]Kc=\frac{(Cu2)(Ag)^2}{(cu)(Ag)^2}[/tex]

Explanation:

because it is products / reactants  

Hope this helps:)

Answer:

I think it is A

Explanation:

A.They study how to make plants produce certain chemicals

Answer:

[tex]{ \tt{(a). { \bf{reactants : { \tt{iron \: and \: oxygen}}}}}} \\ { \bf{products : { \tt{iron(iii)oxide}}}} \\ \\ { \tt{(b).}} \: { \bf{1.204 \times {10}^{24} \: atoms}} \\ { \tt{(c).}} \: { \tt{4Fe +3 O _{2} → 2Fe _{2}O _{3}}} \\ \\ { \underline{ \blue{ \tt{becker \: jnr}}}}[/tex]