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Alexxandr [17]
3 years ago
14

Please answer I will give you brainliest!!

Chemistry
1 answer:
ipn [44]3 years ago
3 0

Answer:

Warm front

Explanation:

A warm front forms when a warm air mass pushes into a cooler air mass, shown in the image to the right (A). Warm fronts often bring stormy weather as the warm air mass at the surface rises above the cool air mass, making clouds and storms. Warm fronts move more slowly than cold fronts because it is more difficult for the warm air to push the cold, dense air across the Earth's surface. Warm fronts often form on the east side of low-pressure systems where warmer air from the south is pushed north.

You will often see high clouds like cirrus, cirrostratus, and middle clouds like altostratus ahead of a warm front. These clouds form in the warm air that is high above the cool air. As the front passes over an area, the clouds become lower, and rain is likely. There can be thunderstorms around the warm front if the air is unstable.

On weather maps, the surface location of a warm front is represented by a solid red line with red, filled-in semicircles along it, like in the map on the right (B). The semicircles indicate the direction that the front is moving. They are on the side of the line where the front is moving. Notice on the map that temperatures at ground level are cooler in front of the front than behind it.

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You start out with 800 moles of a radioactive substance. After 24 hours, 100 moles remain. What is the half-life of the substanc
Nookie1986 [14]

The half life of the substance is 8 hours , Option D is the correct answer.

<h3></h3>

What is Half Life ?

Half-life is the time required by an unstable element  to reduce to half of its initial value.

The term is commonly used in nuclear physics.

The formula is

\rm N(t) = \; N_{0} \;(\dfrac{1}{2} )^{\frac{t}{t_{1/2} } }

N(t)     =    quantity of the substance remaining

N ₀      =    initial quantity of the substance

t    =  time elapsed

\rm t_{1/2}    =    half life of the substance

The data given in the question is N ₀ = 800 moles , N(t)= 100 , t= 24 hours

\rm t_{1/2} =\; ?

Substituting values in the equation

\rm 100 = \; 800 \;(\dfrac{1}{2} )^{\frac{24}{t_{1/2} } }

\rm \dfrac{100}{800}  =  \;(\dfrac{1}{2} )^{\frac{24}{t_{1/2} } }\\\\\rm \dfrac{1}{8}  =  \;(\dfrac{1}{2} )^{\frac{24}{t_{1/2} } }\\\\\rm (\dfrac{1}{2})^{3}  =  \;(\dfrac{1}{2} )^{\frac{24}{t_{1/2} } }\\\\\rm 3=\dfrac{24}{t_{1/2} }\\\\t_{1/2}= \dfrac{24}{3}\\\\t_{1/2} = 8 hours

Therefore half life of the substance is 8 hours , Option D is the correct answer.

To know more about Half Life

brainly.com/question/24710827

#SPJ2

3 0
2 years ago
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kow [346]

Answer:

True statements are 2, 4, 5

Explanation:

They can be broken down by chemical means because we need to break chemical bonds between two (or more) atoms.

They are pure substance because one can't separate them by physical means.

When one separate compounds on two (or more) substances, there are two (or more) different species and they all act differently.

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mrs_skeptik [129]

Answer: um it's 3%H2SO4

6 0
3 years ago
I need help please help me
charle [14.2K]

chemical potential energy, thermal energy, electrical energy, sound energy

Explanation:

the coal is chemical potential energy because it is just sitting there, the coal fueled power plant is thermal energy because it is using the heat from the coal to work the power plant, that is then turned into electrical energy, which then goes to the radio which displays sound energy

<h2>pls give brainliest</h2>
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The electrons that are in the outermost electron shell, also known as the valence shell, have more energy then those in the inner electron shells, I hope this helps<3
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