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3 years ago

When sugar is added to a glass of water, it dissolves. How do you know this?

Chemistry

1 answer:

strojnjashka [21]3 years ago

8 0

Answer:

Use a spoon, scoop up a small amount of the syrup. When you do, you won't be able to see any sugar crystals in the liquid which is water.

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Which describes the path of energy that a gas powered car uses to drive along a road?

harkovskaia [24]

Answer:

mechanical energy to electrical energy to light energy

4 0

3 years ago

What is the energy of an electron in the third energy level of hydrogen?

Roman55 [17]

Answer:

Electrons in a hydrogen atom must be in one of the allowed energy levels. If an electron is in the first energy level, it must have exactly -13.6 eV of energy.

...

Energy Levels of Electrons.

Energy Level Energy

1 -13.6 eV

2 -3.4 eV

3 -1.51 eV

4 -.85 eV

4 0

3 years ago

Unsur senyawa CaCO3 adalah

ella [17]

It is caco3 ok thats the answer

7 0

2 years ago

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.

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

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3 0

2 years ago

Water has a boiling point of 100.0°C and a Kb of 0.512°C/m. What is the boiling

Neko [114]

Answer:

104.352°C

Explanation:

Data Given:

Boiling point of water = 100.0°C

Kb (boiling point constant = 0.512°C/m

Concentration of the Mg₃(PO₄)₂ = 8.5 m

Solution:

Formula Used to find out boiling point

ΔTb = m.Kb . . . . . . (1)

where

ΔTb = boiling point of solution - boiling point of water

So,

we can write equation 1 as under

ΔTb = Tb (Solution) -Tb (water)

As we have to find out boiling point so rearrange the above equation

Tb (Solution) = m.Kb + Tb (water) . . . . . . . (2)

Put values in Equation 2

Tb (Solution) = (8.5 m x 0.512°C/m ) + 100.0°C

Tb (Solution) = 4.352 + 100.0°C

Tb (Solution) = 104.352°C

so the boiling point of Mg₃(PO₄)₂ 8.5 m solution = 104.352°C

3 0

3 years ago