Can someone help me with this
What is this chemistry form

Answer:

Explanation:

  1 Non-zero digits are always significant.

  2 Any zeros between two significant digits are significant.

  3 A final zero or trailing zeros in the decimal portion ONLY are significant.

[tex] \overline{ \quad \quad \quad \quad\quad\quad\quad\quad\quad}[/tex]

[tex]\sf{Hope\:it\:Helps!}[/tex]

Answer:

D

Explanation:

Answer:

It works by separating the fuel from the oxygen. The oxygen comes from the air. It is the same oxygen we breathe. Since the oxygen has to be in contact with the fuel, if you can coat the fuel with something that keeps the oxygen away, the fire will go out which is what the fire extinguisher does.

The solubility of the solutes in the solution will determine whether each of the solutions will be saturated or unsaturated at 50 degree celcius.

Saturated solutions are solutions which contains as much solute as they can dissolve at that temperature in the presence of undissolved solute.

An unsaturated solution is a solution which contains less solute than it can dissolve at that temperature.

The solubility of a solute determines whether its solution will be saturated or unsaturated at a given temperature.

Therefore, the solubility of the solutes in the solution will determine whether each of the solutions will be saturated or unsaturated at 50 degree celcius.

Learn more about saturated and unsaturated solutions at: https://brainly.com/question/15462976

#SPJ1

The amount of 0.25 M KI solution is needed is 0.38 L.

Solution is defined as a homogeneous mixture of two or more substances in relative amounts that can be continually altered up to what is known as the limit of solubility.

It can also be defined as a combination of one substance dissolved in another with the same properties throughout.

The solution can be homogenous or heterogenous mixture.

2 KI + Pb(NO3)2 → Pbl₂ + 2 KNO3

As per the reaction

The ratio is KI : Pb(NO3)2 is 1:1

So, we use M1V1 = M2V2

As given, M1 = 0.25 M

                M2 = 0.75 M

                V2 = 0.125 L

So, V1 = M2 V2 / M1

      V1 = 0.75 x 0.125 / 0.25

       V1 = 0.38 L

Thus, the  amount of 0.25 M KI solution is needed is 0.38 L.

To learn more about solution, refer to the link below:

https://brainly.com/question/7932885

#SPJ2

Answer: Heyaa! :)

Condensation is the process of water vapor turning back into liquid water!

Explanation:

Hopefully this helps you!

-Matthew ~

When an object of mass 2Kg and applied force is 10N then acceleration is 5 m/s/s.

Newton's second Law of motion will be represented as:

F = m.a, where

Acceleration for the first row will be calculated as:

Acceleration for the second row will be calculated as:

Mass for the third row will be calculated as:

Mass for the forth row will be calculated as:

Force for the fifth row will be calculated as:

Hence, acceleration of the object whose mass is 2kg and force on that object is 10N is 5m/s/s.

To know more about newton's second law, visit the below link:
https://brainly.com/question/25545050

#SPJ1

Answer:

n = 0.487⋅mol

Explanation

n=PVRT

=0.4⋅atm×30⋅L0.0821⋅L⋅atm⋅K−

1⋅mol−1×300⋅K

=0.487⋅mol

Answer:

Half circle

Explanation:

because in the next day between 5O'clock the sun will rise then the moon will therefore created to be in a half moon

Answer:

112.2L

Explanation:

Volume (V) = 300g

Temperature (T) = 822K

Pressure (P) = 0.9atm

using the ideal gas equation;

[tex]PV = nRT\\\\ V = \frac{nRT}{P}[/tex]

Molar gas constant (R) = [tex]0.0821L.atm/mol.K[/tex]

Mole (n) = [tex]\frac{Mass (m)}{Molar mass (M)}[/tex]                Molar mass of Mercury  = 200.59g/mol

[tex]n = \frac{300g}{200.59 g/mol} \\[/tex]

   = 1.496mol

Now, the volume can be calculated;

V = [tex]\frac{1.496mol* 0.0821L.atm/mol.K*822K}{0.9atm}[/tex]

∴Volume of mercury = [tex]112.2L[/tex]

The % ionization of HN0₂ is 6.98 %

The relative strengths of acids may be determined by measuring their equilibrium constants in aqueous solutions.

In solutions of the same concentration, stronger acids ionize to a greater extent, and so yield higher concentrations of hydronium ions than do weaker acids.

Percentage Ionization is the measure of the strength of an acid is its percent ionization.

The percent ionization of a weak acid is the ratio of the concentration of the ionized acid to the initial acid concentration, times 100:

The chemical equation for the dissociation of the nitrous acid is:

HNO₂(aq)+H₂O(l)⇌NO²⁻(aq)+H₃O⁺(aq).

[tex]\rm \% \;ionization = \dfrac{[H_{3}O^{+} ] _{eq} }{[HNO_{2}]_{0} } \times 100[/tex]

 [tex]\rm 10^{-pH} =[/tex] [H₃O⁺] ,

we find that with given pH of 1.98

[tex]10^{-1.98} =[/tex] 0.01047128548 M=[H₃O⁺]

Molarity of HN0₂ = 0.15 M

so that percent ionization is

[tex]\% ionization = \dfrac{0.01047128548 }{0.15 } \times 100[/tex]

[tex]\% ionization = 6.98 \%[/tex]

Therefore the % ionization of HN0₂ is 6.98 %

To know more about percentage Ionization

https://brainly.com/question/13131257

#SPJ1

Answer:

Im pretty sure that 5N to the Right is correct answer

Answer:

14.547 ml

Explanation:

1 gallon= 4546.09 ml

Answer:

answer

Cold Front - a zone separating two air masses, of which the cooler, denser mass is advancing and replacing the warmer.

Warm Front - a transition zone between a mass of warm air and the cold air it is replacing.

Stationary Front - a front between warm and cold air masses that is moving very slowly or not at all.

Answer:

The value of x in ethanol is 5

Explanation:

Given molar mass, you can subtract the molar masses of different elements present to find the missing amount of hydrogen; in other words:
Carbon*2 + Hydrogen*x + Oxygen*1 + Hydrogen*1 = 46
Molar mass carbon = 12.01
Molar mass hydrogen = 1
Molar mass oxygen = 16
12.01*2 g/mol + 1*x g/mol + 16*1 g/mol + 1*1 g/mol = 46 g/mol
Subtracting all knowns from the current molar mass gives
46 - 41.02 = 4.98

This means that x amounts of hydrogen has a molar mass of 4.98, or roughly just 5. Since each hydrogen has a molar mass of one, that means that there are 5 hydrogens missing and the complete molecular formula is C2H5OH

Answer:

c i got it right on usatestprep

Explanation:

............

The standard enthalpy of formation of ethane is determined as -192.5 kJ/mol.

The reaction for the formation of ethane is given as;

2C + 3H₂ → C₂H₆

Where;

The standard enthalpy of formation of ethane is calculated as follows;

ΔH = ΔH₁ + ΔH₂  + ΔH₃

where;

2C + 3H₂ → C₂H₆

ΔH = 2(-286) + 3(-393.5) + 1(1560)

ΔH = -572 - 1180.5 + 1560

ΔH = -192.5 kJ/mol

Learn more about standard enthalpy here: https://brainly.com/question/14047927

#SPJ1

The equation which is balanced is S₈ + 12O₂ → 8SO₃.

Balanced reactions are those reactions in which all entities are present on the reactant side as well as on the product side of the reaction.

Above equation is unbalanced as all atoms are not present in same amount.

Above equation is unbalanced as all atoms are not present in same amount.

Above equation is balanced as all atoms are present in same amount on reactant side as well as product side.

Above equation is unbalanced as all atoms are not present in same amount.

Hence, S₈ + 12O₂ → 8SO₃ is a balanced equation.

To know more about balanced equation, visit the below link:
https://brainly.com/question/15355912

#SPJ1

Explanation:

Answer:

Explanation:

                                       Answer:

Explanation: stay the same

Answer: An Ecosystem

Explanation: