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3 years ago

How do you know when a substance is boiling?

Chemistry

2 answers:

IrinaVladis [17]3 years ago

4 0

When the substance is creating gases. Sometimes when it’s bubbling up

Lunna [17]3 years ago

3 0

When you are boiling eggs for example the pot with water is hot and you can see bubbles in the pot. This is called boiling water. When the eggs are in there they are boiling to make hard boiled eggs. Depending on how long it is in there determines the outcome. On the surface of the egg shell you may also notice little bubbles all around the shell which means it is boiling.

Hope this helps! :3

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During which season is the sun highest in the sky?

Scilla [17]

It’s summer ywwwwwwwww

8 0

3 years ago

The correct increasing order of Bond angle is H2O < NH3 < BCl3 < CCl4 H2O < NH3 < CCl4 < BCl3 NH3 < H2O &lt

Step2247 [10]

Answer:

H2O < NH3 < CCl4 < BCl3

Explanation:

Bond angle of a molecule or an ion can be explained by two concepts which are either by their valence shell electron pair repulsion (VSEPR) model or hybridization.

The VSEPR model determines the total number of electron pairs surrounding the central atom of the species. All the electron pairs will orient themselves in such a way as to minimize the electrostatic repulsions between them. These repulsions hence determine the geometry of the covalent bond angles around the central atom.

Hence; as the number of lone pairs increases from zero to 2 the bond angles diminish progressively.

Hybridization is the mixing and blending of two or more pure atomic orbitals to form two or moe hybrid atomic orbitals which are identical in shape and energy. During the process of formation of these hybrid orbitals, The bonds formed i.e the sigma bond and the pi bond determines the bond angle of such compound.

From the given compounds;

H20 have a bond angle of 104.5°

NH3 have a bond angle of 107°

BCl3 have a bond angle of 120°

CCl4 have a bond angle of 109.5°

thus in an increasing order of bond angle:

H2O < NH3 < CCl4 < BCl3

5 0

3 years ago

Ella has a mass of 56 kg, and Tyrone has a mass of 68 kg. Ella is standing at the top of a skateboard ramp that is 1.5 meters ta

Ket [755]

Answer:

The correct answer is the last statement that if Tyrone stands at the top of a two meter high ramp, the potential energy of Tyrone will be greater in comparison to Ella.

Explanation:

The energy possessed by an object due to its position is termed as its potential energy. The formula for calculating potential energy is,

Potential energy = mgh, where m is mass, g is gravity, and h is height.

The respective masses of Ella and Tyrone as mentioned in the question is 56 Kg and 68 Kg. By looking at all the conditions as mentioned in the given options we get,

1) When both Ella and Tyrone are standing at the same ramp height:

Potential energy of Ella = 56*9.8*1.5 = 823.2J (The value of g is 9.8 m.s^-2)

Potential energy of Tyrone = 68*9.8*1.5 = 999.6J

Thus, when both are standing at the same ramp height, the potential energy of Tyrone will be more than Ella.

2) When Tyrone stands at the top of 1 m high ramp, and Ella at 1.5 m:

Potential energy of Ella = 56*9.8*1.5 = 823.2J

Potential energy of Tyrone = 68*9.8*1 = 666.4J

Thus, the potential energy of Tyrone will be less in comparison to Ella.

3) If Tyrone stands at the top of 2 m high ramp and Ella at 1.5 m:

Potential energy of Ella = 56*9.8*1.5 = 823.2J

Potential energy of Tyrone = 68*9.8*2 = 1332.8J

Thus, the potential energy of Tyrone will become more than Ella. Hence, the condition mentioned in the last statement is correct.

5 0

3 years ago

Read 2 more answers

Isopropyl Alcohol (C3H8O) is the active ingredient in hand sanitizer. If I have 125 grams of Isopropyl Alcohol (C3H8O)...

AnnyKZ [126]

Answer:

There are 1*10^25 H atoms present

Explanation:

Step 1: data given

Mass of Isopropyl Alcohol (C3H8O) = 125 grams

Molar mass of Isopropyl Alcohol (C3H8O) = 60.1 g/mol

Number of Avogadro = 6.02 *10^23 /mol

Step 2: Calculate moles Isopropyl Alcohol

Calculate moles Isopropyl Alcohol = mass C3H8O / molar mass C3H8O

Calculate moles Isopropyl Alcohol = 125 grams / 60.1 g/mol

Calculate moles Isopropyl Alcohol = 2.08 moles

Step 3: Calculate moles of hydrogen

For 1 mol C3H8O we have 8 moles hydrogen

For 2.08 moles we have 8*2.08 = 16.64 moles hydrogen

Step 4: Calculate amount of hydrogen atoms

Hydorgen atoms = moles H * number of Avogadro

Hydrogen atoms = 16.64 moles * 6.02* 10^23 / mol

Hydorge, atoms = 1*10^25 H atoms

There are 1*10^25 H atoms present

8 0

4 years ago

Given two adjacent vertices of a parallelogram A (3,5), B (1,7) and the point of intersection of their diagonals M (1,1), determ

just olya [345]

HOPE YOU UNDERSTAND. PLEASE MARK IT AS BRAINLIEST

Answer:

A (3,5), B (1,7) ,C(-1,-3),D(1,-5)

Explanation:

M[1,1]= [Diagonals bisect each other]

$[ \frac{x_{1} + x_{2}}{2} , \frac{y_{1} + y_{2}}{2}]\\(\frac{3+x_{2} }{2} , \frac{5+y_{2} }{2})\\\frac{3+x_{2} }{2}=1 , \frac{5+y_{2} }{2}=1\\3 + x_{2} = 2 , 5 + y_{2} = 2\\x_{2} = -1 , y_{2} = -3\\\\$

C(-1,-3)

M[1,1]= [Diagonals bisect each other]

$[\frac{x+1}{2} , \frac{y+7}{2}]\\\frac{x+1}{2}=1 , \frac{y+7}{2}=1\\x+1=2 , y+7=2\\x=1, y=-5$

D(1,-5)

hence,

A (3,5), B (1,7) ,C(-1,-3),D(1,-5)

8 0

4 years ago