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Roman55 [17]
3 years ago
6

extremely hot.When a student went to open the car doo , he burned his finger. What two forms of energy were responsible for the

student burning his fingers
Chemistry
1 answer:
charle [14.2K]3 years ago
3 0

Answer:

radiation and conduction

Explanation:

During a warm summer day, a car became extremely hot. When a student went to open the car door, he burned his fingers. What two forms of energy were responsible for the student burning his fingers?

Solution:

Heat is the transfer of energy from a warmer object to a cooler object. For heat transfer to occur, there have to be a difference in temperature between two objects.  

Heat can be transferred in three ways: by conduction, by convection, and by radiation.

Conduction is the transfer of thermal energy between bodies through direct contact. Convection is the transfer of thermal energy through the movement of heat in a liquid or gas. Radiation is the transfer of thermal energy through thermal emission by electromagnetic waves.

During a warm summer day, The sun makes the car to become hot through energy transfer from the sun to the car. When the student touch the car, there is heat transfer as a result of conduction.

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Which part of the electrochemical cell allows the back-and-forth passage of ions from the cathode to the anode? the half cell
olganol [36]
Answer is "The salt Bridge"

Explanation:
                   During the spontaneous reaction in Voltaic Cell, the balance of ions get disturb due to increase in concentration of negative charge in one half cell and positive charge in another. In order to keep balance the charges in cell,  concentration of ions on both sides and overall neutrality of the system, a U-shape tube filled with inert electrolyte is connected to both half cells. The electrolyte migrates in such a way that the charges of solution in cells keep constant.
6 0
3 years ago
The question below ......... in picture
Ivanshal [37]

Answer:

10.49

Explanation:

3MgO + 2Fe — Fe2O3 + 3Mg

n(Fe2O3) = m/M

=15/159.69

=0.9393199324mol

1 Mol of Fe2O3 = 2 moles of Fe

Therefore n(Fe) =2 * 0.9393199324

=0.1878639865mol

m(Fe) = n*m.m

= 0.1878639865 * 55.8

=10.4828g

6 0
3 years ago
How many grams of NaOH are contained in 5.0*10ml of a0. 77 sodium hydroxide solution
Solnce55 [7]

Answer:

1.54grams

Explanation:

Molarity of a solution = n/V

Where;

n = number of moles (mol)

V = volume (L)

Based on the information given in this question;

Volume of NaOH solution = 5.0 × 10ml

= 50ml = 50/1000 = 0.050 L

Molarity = 0. 77 M

Using; Molarity = n/V

0.77 = n/0.05

n = 0.77 × 0.05

n = 0.0385mol

To find the mass (grams) of NaOH in the solution, we use the following formula:

mole (n) = mass/molar mass

Molar mass of NaOH = 23 + 1 + 16 = 40g/mol

0.0385 = mass/40

mass = 0.0385 × 40

mass = 1.54grams.

8 0
3 years ago
The melting point of phenol is 40.5∘C and that of toluene is −95∘C. What is the best explanation for this difference? Select the
romanna [79]

Answer:

None of the above

Explanation:

The (−OH) group on phenol can form hydrogen bonds, and the −CH3 group on toluene cannot.

Phenol has only one hydrogen on the −OH group available to form hydrogen bonds, so the hydrogen bond is stronger. In toluene, the hydrogen bond is spread over all three hydrogens on the methyl group, so the interaction is weaker overall.

Phenol has a higher molecular mass than toluene.

3 0
3 years ago
Read 2 more answers
What is the [OH-] in a solution that has a [H3O+] = 1.0 x 10-6 M?
nika2105 [10]

Answer:

explanation

kw = 1 \times  {10}^{ - 14}

oh =  {?}

h3o = 1.0 \times 10 {}^{ - 6}

formula

kw = h3o \times oh

insert \: values

1.0 \times 10  {}^{ - 14}  = 1.0 \times  {10}^{ - 6}  \times oh

\frac{1.0 \times 10 {}^{ - 14} }{ 1.0 \times 10 {}^{ - 6} }  = oh

1 \times  {10}^{ - 8}

7 0
3 years ago
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