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lilavasa [31]
3 years ago
11

Express in scientific notation. 1.24 x 10^6/ 6.2 x 10^-3

Chemistry
1 answer:
ryzh [129]3 years ago
3 0

Answer:

1.24*10^6=1.24*1000000=1240000

6.2*10^-3=6.2*0.001=0.0062

Explanation:

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What is the answer for this question
cestrela7 [59]

Answer:

The answer to your question is the second choice

Explanation:

Formula to calculate the heat of any substance

             Q cal= mCcal ΔTcal

Formula to calculate the heat of a metal. The heat will be negative because it releases heat.

                  Qm = -mCmΔTm

Now equal both formula

                   Qcal = Q m

           mCcalΔTm = -mCmetΔTmet

-Solve for Cmet

                 Cmet = -[mCcalΔTm] / mΔTmet

6 0
3 years ago
A scientist is adding oxygen to iron in a chemical reaction to create rust. At what point during
Shalnov [3]

Answer: What type of chemical reaction is rusting of iron?

Rust is formed when iron reacts with oxygen in moist air. The following chemical equation represents the reaction: 4Fe + 3O2 → 2Fe2O3. Water is necessary for the oxidation reaction to occur and to facilitate transport of the electrons.

4 0
3 years ago
A photon with 2.3 eV of energy can eject an electron from potassium. What is the corresponding wavelength of this type of light?
Ira Lisetskai [31]

Answer:

\lambda=540.16\ nm

Explanation:

Given that:

The energy of the photon = 2.3 eV

Energy in eV can be converted to energy in J as:

1 eV = 1.60 × 10⁻¹⁹ J

So, Energy = 2.3\times 1.60\times 10^{-19}\ J=3.68\times 10^{-19}\ J

Considering

Energy=\frac {h\times c}{\lambda}

Where,  

h is Plank's constant having value 6.626\times 10^{-34}\ Js

c is the speed of light having value 3\times 10^8\ m/s

\lambda is the wavelength of the light being bombarded

Thus,  

3.68\times 10^{-19}=\frac {6.626\times 10^{-34}\times 3\times 10^8}{\lambda}

\frac{3.68}{10^{19}}=\frac{19.878}{10^{26}\lambda}

3.68\times \:10^{26}\lambda=1.9878\times 10^{20}

\lambda=5.40163\times 10^{-7}\ m=540.16\times 10^{-9}\ m

Also,  

1 m = 10⁻⁹ nm

So,  

\lambda=540.16\ nm

3 0
4 years ago
Give answer with correct number of significant figure 600*180
zubka84 [21]

Answer:

The answer to this question is; <em>1.08 x 10^5</em>

Explanation:

This is the correct option because

600 x 180 = 108,000

108,000. -> move the decimal over 5 times to get a number between 1 and 10

1.08 x 10^5

7 0
3 years ago
Which actions represent endothermic reactions? Check all that apply. an instant ice pack becoming cold, splitting a gas molecule
DerKrebs [107]
Answer is: an instant ice pack becoming cold, splitting a gas molecule and baking bread.

<span>Endothermic reaction is chemical reaction that absorbs more energy than it releases.
</span>In ice pack, <span>reaction absorbs heat from the surroundings (endothermic reaction), lowering the surrounding temperature.
For splitting molecule and baking bread we must add energy to break bonds between atoms.</span>
6 0
3 years ago
Read 2 more answers
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