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3 years ago

WILL MARK BRAINLIST!!! only for correct answer NEED CORRECT ANSWER ASAPPP

Chemistry

1 answer:

lilavasa [31]3 years ago

7 0

Answer:

D. 4

Explanation:

Reflection can be defined as a phenomenon which typically involves a change in the direction of a ray of light or waves as it falls on a smooth surface.

Simply stated, reflection occurs when a ray of light or wavefronts bounces off a smooth surface.

Hence, from the diagram provided above, the thin beam of light which illustrates reflection is the fourth because as it hit the surface, it bounced back to the medium from which it was originally propagated with.

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Plsss help!!! ASAP!!!

Verizon [17]

The electronic configuration is for iron (Fe) because if you add all those power up it will give you 26 and it’s the atomic number of Fe

4 0

3 years ago

A sample of helium occupies a volume of 180.0 ml at a pressure of 0.800 atm and a temperature of 29°C. What will be the

Brrunno [24]

Answer:

If the volume of the container is decreased to 90.0 ml and the pressure is increased to 1.60 atm the temperature will be 302 °K

Explanation:

Boyle's law says that "The volume occupied by a given gas mass at constant temperature is inversely proportional to the pressure", which is expressed mathematically as:

P * V = k

Charles's Law consists of the relationship between the volume and temperature of a certain amount of ideal gas, which is maintained at a constant pressure, by means of a proportionality constant that is applied directly. In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the ratio between volume and temperature will always have the same value:

$\frac{V}{T} =k$

Finally, Gay Lussac's law establishes that as the temperature increases, the gas molecules move more quickly and therefore the number of collisions against the walls increases, that is, the pressure increases since the container is of fixed walls and its volume can not change. Therefore, the ratio of pressure to temperature always has the same value (it is constant).

$\frac{P}{T}=k$

Combined law equation is the combination of three gas laws called Boyle's, Charlie's and Gay-Lusac's law:

$\frac{P*V}{T}=k$

Having a state 1 at the beginning and a state 2 at the end is fulfilled:

$\frac{P1*V1}{T1}=\frac{P2*V2}{T2}$

In this case, you know:

P1= 0.800 atm
V1= 180 mL= 0.180 L (being 1 L=1000 mL)
T1= 29 °C= 302 °K
P2= 1.60 atm
V2= 90 mL= 0.09 L
T2=?

Replacing:

$\frac{0.800 atm*0.180L}{302 K}=\frac{1.60 atm*0.09L}{T2}$

Solving:

$T2*\frac{0.800 atm*0.180L}{302 K}=1.60 atm*0.09L$

$T2=\frac{1.60 atm*0.09L}{\frac{0.800 atm*0.180L}{302 K}}$

T2= 302 °K

<em><u>If the volume of the container is decreased to 90.0 ml and the pressure is increased to 1.60 atm the temperature will be 302 °K</u></em>

8 0

3 years ago

The ph scale for acidity is defined by ph=−log10[h+] where [h+]is the concentration of hydrogen ions measured in moles per liter

Leokris [45]

The question is incomplete.

The complete question probably is

The pH scale for acidity is defined by pH = − log₁₀[H⁺] where [H⁺] is the concentration of hydrogen ions measured in moles per liter (M). A solution has a pH of 2.55. Find the hydrogen ion concentration.

Answer: -

0.003 M

Explanation: -

pH = − log₁₀[H⁺]

Thus the hydrogen ion concentration [H⁺] = $10^{-pH}$

= $10^{-2.55}$

= 0.003 M

7 0

4 years ago

3. People and instruments produce different ranges of sound temperatures is this true or false

anzhelika [568]

True I believe since every person has a different temperature and sound waves.

6 0

3 years ago

Determine if the results of the following word problem adhere to the Law of Conservation of Mass. 1. A chemist combines 4.9 g of

KiRa [710]

Answer: The results agree with the law of conservation of mass

Explanation:

The law of conservation of mass states that mass is neither created nor destroyed in a chemical reaction. On the reactant side, the total mass of reactants is 14.3g and the total product masses is also 14.3g. That implies that no mass was !most in the reaction. The sum of masses on the left hand side corresponds with sum of masses on the right hand side of the reaction equation.

4 0

3 years ago