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allochka39001 [22]
3 years ago
9

Burning your hand when accidentally touching a hot plate is an example of which heat transfer? a.Conduction b.Convection c.Radia

tion d.None of these
Compare and contrast Conduction and Convection. Which is true? a.Convection can transfer heat through a vacuum, but Conduction cannot. b.Conduction can only occur through liquids, but Convection can transfer heat through solids. c.Convection can only transfer heat through fluids, but Conduction can transfer heat through solids and fluids. d.Conduction must have matter in order to transfer heat, but Convection does n
Chemistry
2 answers:
aniked [119]3 years ago
7 0

Answer by YourHope:


Hi! :)


Question: Burning your hand when accidentally touching a hot plate is an example of which heat transfer?


Answer: A) Conduction!


Question: Compare and contrast Conduction and Convection. Which is true?


Answer: C) Convection can only transfer heat through fluids, but Conduction can transfer heat through solids and fluids!


Have a BEAUTIFUL day~

agasfer [191]3 years ago
7 0

burning your hand while touching a hot plate is conduction. the heat from the plate is being conducted to your hands.


conduction is when a substance of matter allows heat to flow throw it easily, but convection is when heat is transferred to a liquid or gas.


the correct answer is D. conduction must have matter in order to transfer heat, but convection does not it needs a fluid.

and radiation is the one that is the one that takes place in outer space or in vacuums.


hoped it helped :D

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what is the boiling point of the solution resulted from the dissolving of 32.5g of NaCl in 250.0g of water?
suter [353]

Answer:

The boiling point of this solution is 102.28 °C

Explanation:

<u>Step 1:</u> Data given

Mass of Nacl = 32.5 grams

Molar mass of NaCl = 58.45 g/mol

Mass of Water = 250 grams

Boiling point of water = 100°C

<u>Step 2: </u>Calculate number of moles

Number of moles = mass of NaCl / Molar mass of NaCl

Number of moles = 32.5 grams /58.45 g/mol = 0.556 moles

<u>Step 3:</u> Calculate molality

Molality = Number of moles / mass of water

Molality = 0.556 moles / 0.250 kg of water

Molality = 2.224 molal

NaCl releases twice as many moles of ions, the total molality of this solution is also twice: 4.448 molal

Step 4: Calculate boiling point

dT =( 0.512 C / molal)*4.448 molal)

dT = 2.28

The boiling point of this solution is 100 °C + 2.28 °C = 102.28 °C

8 0
3 years ago
2. Write the charge of each sub-atomic particle in the helium atom above.
algol [13]

Explanation:

The charge of a helium atom is zero

It is neutral because

The number of unit negative charges = number of unit positive charges

One unit negative charge = -1.6 x 10^(-19) which is basically the charge of an electron

One unit positive charge = +1.6 x 10^(-19) which is basically the charge of a proton

A helium atom has 2 protons and 2 electrons, so it is neutral

NOTE: an alpha-particle (He2+) is a charged helium atom it has 2 protons and 0 electrons. Charge of an alpha particle = +3.2 x 10^(-19).

7 0
3 years ago
CALCULATE THE VOLUME OF 16 g OF OXYGEN GAS AT S.T.P?
White raven [17]

Answer:

To calculate the volume we must first find the number of moles

Number of moles (n ) = mass / Molar mass (M)

Since oxygen is diatomic

M of oxygen = 16 × 2 = 32g/mol

n = 16 / 32 = 0.5mol

Next we use the formula

V = n × V(dm³)

where V is the volume

V(dm³) is the volume of 1 mole of a substance at s.t.p which is

22.4dm³

Volume of oxygen gas at s.t.p is

0.5 × 22.4dm³

= 11.20dm³

Hope this helps you

7 0
3 years ago
What mass of iron(II) oxide must be used in the reaction given by the equation below to release 44.7 kJ? 6FeO(s) + O2(g) =&gt; 2
zavuch27 [327]

<u>Answer:</u> The mass of iron (II) oxide that must be used in the reaction is 30.37

<u>Explanation:</u>

The given chemical reaction follows:

6FeO(s)+O_2(g)\rightarrow 2Fe_3O_4(s);\Delta H^o=-635kJ

By Stoichiometry of the reaction:

When 635 kJ of energy is released, 6 moles of iron (II) oxide is reacted.

So, when 44.7 kJ of energy is released, \frac{6}{635}\times 44.7=0.423mol of iron (II) oxide is reacted.

Now, calculating the mass of iron (II) oxide by using the equation:

\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}

Moles of iron (II) oxide = 0.423 moles

Molar mass of iron (II) oxide = 71.8 g/mol

Putting values in above equation, we get:

0.423mol=\frac{\text{Mass of FeO}}{71.8g/mol}\\\\\text{Mass of FeO}=(0.423mol\times 71.8g/mol)=30.37g

Hence, the mass of iron (II) oxide that must be used in the reaction is 30.37

7 0
4 years ago
Draw the Lewis Structure for NaCl
Trava [24]

Explanation:

The electronic configuration of sodium with Z = 11 is : 2, 8, 1

The electronic configuration of chlorine with Z = 17 is : 2, 8, 7

The Lewis structure is drawn in such a way that the octet of each atom is complete.

Thus, sodium losses one electron to chlorine and chlorine accepts this electron to form ionic bond.

Thus, the valence electrons are shown by dots in Lewis structure. The structure is shown in image below.

8 0
3 years ago
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