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4 years ago

Define a force.......

Chemistry

2 answers:

FinnZ [79.3K]4 years ago

6 0

Answer:

Gravitational Force.

Gravitation is the agent that gives weight to objects with mass and causes them to fall on the ground when dropped.

grin007 [14]4 years ago

5 0

Answer:

A force is the strength or energy as an attribute of physical action or movement.

Explanation:

In smaller words, a force is a form of energy caused from a push or a pull on an object. A force happens when two objects interact with each other. For example, when you throw a ball you are using force.

Hopefully this helps im sorry if i got it wrong im kinda dumb... XD

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The 1995 Nobel Prize in chemistry was shared by Paul Crutzen, F. Sherwood Rowland, and Mario Molina for their work concerning th

Nikolay [14]

Answer:

$\Delta H_{rxn3}=-162.5 kJ/mol$

Explanation:

The reaction we need to calculate:

$O_3 (g) + Cl (g) \longrightarrow ClO (g) + O_2 (g)$

1) $O_3 (g) + ClO (g) \longrightarrow Cl (g) +2 O_2 (g)$

$\Delta H_{rxn}=-122.8 kJ/mol$

We need the ClO in the products side, so we use the inverse of this reaction:

$Cl (g) +2 O_2 (g) \longrightarrow O_3 (g) + ClO (g)$

$\Delta H_{rxn1}=122.8 kJ/mol$

2) $2 O_3 (g) \longrightarrow 3 O_2 (g)$

$\Delta H_{rxn2}=-285.3 kJ/mol$

Now we need to combine this two:

$Cl (g) +2 O_2 (g) + 2 O_3 (g)\longrightarrow O_3 (g) + ClO (g) + 3 O_2 (g)$

$Cl (g) + O_3 (g)\longrightarrow ClO (g) + O_2 (g)$

The enthalpy of reaction:

$\Delta H_{rxn3}=\Delta H_{rxn1}+ \Delta H_{rxn2}=122.8 kJ/mol-285.3 kJ/mol$

$\Delta H_{rxn3}=-162.5 kJ/mol$

4 0

3 years ago

How many kilojoules of heat are required to melt a 10-g popsicle is 0°C ? Assume the particle has the same molar mass and heat o

Fantom [35]

<h3><u>Answer;</u></h3>

3.4 kJ

<h3><u>Explanation</u>;</h3>

Taking the mass of water as 10.0 g

Moles of water = Mass /molar mass

Moles of water in 10.0 g;

= 10g H2O x 1mol/18g

=0.56mol

But, 1 mole of water = 6.01 kJ

Hence;

6.01kJ/1mol H2O= x kJ/.56mol,

x = <u>3.4kJ</u>

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4 years ago

In a closed container, the vapor pressure of 10 mL of ethanol at 20 degrees C is 5.85 kPa. What is the vapor pressure of 20 mL o

natulia [17]

Answer:

${P_2}=2.925\ kPa$

Explanation:

At same temperature and same number of moles, Using Boyle's law

${P_1}\times {V_1}={P_2}\times {V_2}$

Given ,

V₁ = 10 mL

V₂ = 20 mL

P₁ = 5.85 kPa

P₂ = ?

Using above equation as:

${P_1}\times {V_1}={P_2}\times {V_2}$

${5.85\ kPa}\times {10\ mL}={P_2}\times {20\ mL}$

${P_2}=\frac{{5.85}\times {10}}{20}\ kPa$

${P_2}=2.925\ kPa$

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4 years ago

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Alja [10]

D.) He arranged elements by Atomic Masses

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fiasKO [112]

Answer:

I hope this helps.

Explanation:

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3 years ago