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3 years ago

Which statement is true?

Chemistry

2 answers:

NNADVOKAT [17]3 years ago

8 0

Answer:

I think the answer is no C

Crazy boy [7]3 years ago

7 0

Answer:

C. sound waves travel faster than light waves

Explanation:

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Arrange the following molecules by increasing bond polarity...?

Radda [10]

The correct answer is Cl₂ <CCl₄ < PCl₃ < CaCl₂ < CsCl (most polar)

Cl₂ is nonpolar or least polar as there is no differentiation in electronegativity of the two atoms of chlorine producing amongst them. CCl₄ exhibits four C-Cl bonds. The C-atom is electropositive and Cl is electronegative. Therefore, there are four dipoles in CCl₄. Though, these dipoles cancel each other because of the tetrahedral geometry of the molecule. Therefore, CCl₄ is less polar in comparison to others, however, more polar in comparison to Cl₂.

PCl₃ exhibits three dipoles because of electronegative chlorine atoms, and electropositive phosphorus atom. Though, the configuration of the molecule is trigonal pyramidal, producing it more polar in comparison to CCl₄. The CaCl₂ is ionic compound, therefore, polar in comparison to the covalent bond compounds.

CsCl is ionic compound, however, more polar in comparison to CaCl₂, as there is the higher difference in electronegativity of Cs and Cl compared with that between the Ca and Cl.

7 0

3 years ago

Calculate the total amount of energy required to change 10.0 g of water from 35.0 degrees Celsius to 110. degrees Celsius.

Makovka662 [10]

Answer:

The total amount of energy required is 25,515.2 J.

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

When a system absorbs (or gives up) a certain amount of heat, it can happen that:

experience a change in its temperature, which involves sensible heat,
undergoes a phase change at constant temperature, or latent heat.

To calculate the latent heat the formula is used:

Q = m. L

Where

Q: amount of heat
m: mass
L: latent heat

To calculate sensible heat the following formula is used:

Q = m. c. ΔT

where:

Q: amount of sensible heat
m: body mass
c: specific heat of the substance
ΔT: temperature range

In this case, you have in the first place a heat to raise the temp of the water from 35.0 C to 100 C, where the specific heat value for water is 4.184 $\frac{J}{g*C}$ :

q1 = m*c*(Tfinal-Tinitial)

q1 = 10.0 g *(4.184 $\frac{J}{g*C}$ )* (100 - 35.0 C) = 2719.6 J

Now you have the heat to vaporize the water, where the heat of vaporization is 2259.36 $\frac{J}{g}$ :

q2 = m*(heat of vaporization)

q2 = 10.0 g*(2259.36 $\frac{J}{g}$ ) = 22593.6 J

Finally, you have the heat to raise temp of steam to 110 C, where the specific heat value for steam is 2.02 $\frac{J}{g*C}$ :

q3 = m*c*(Tfinal-Tinitial)

q3 = 10.0 g*(2.02 $\frac{J}{g*C}$ )*(110-100 C) = 202 J

The total amount of energy can be calculated as:

Q= q1 + q2 + q3

Q= 2719.6 J + 22593.6 J + 202 J

Q=25,515.2 J

The total amount of energy required is 25,515.2 J.

5 0

3 years ago

Balance this equation---> Fe(s)+O2(g)--->FeO(s) (s) = solid (g)= gas

allsm [11]

To balance this equation simply place the coefficient 2 in front of both the iron metal and the iron II oxide FeO.

8 0

4 years ago

A 5.20 mol sample of solid A was placed in a sealed 1.00 L container and allowed to decompose into gaseous B and C. The concentr

ELEN [110]

Answer:

2.60 moles of A remaining.

Explanation:

According to Le Chatelier's principle, the equilibrium would shift if the volume, concentration, pressure, or temperature changes.

In this question, we were told that the volume doubles, that implies that we would have to double the molarity of B/ C (since B=C.)

However, it is obvious and clear from the given equation of the reaction that A is solid in it's activity = 1. Hence, it is then ignored.

So doubling B would be 1.30 M × 2 = 2.60 M

i.e 2.60 M moles of A was consumed.

Now; the number of moles of A remaining is 5.20 - 2.60 = 2.60 moles of A remaining.

5 0

3 years ago

Two cups of the same size are filled to the brim with clear liquids. Only one container holds water. The other contains a liquid

Setler79 [48]

D add salt to both liquids

6 0

3 years ago

Read 2 more answers