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3 years ago

1. Describe what Rutherford’s model of an atom looks like .

Chemistry

1 answer:

andreyandreev [35.5K]3 years ago

3 0

1.Rutherford's atom has a small, dense nucleus that is positively charged, contains 1 proton, contains neutrons...

I believe this is it....

Hope this helps...

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Which of the following statements about electromagnetic and mechanical waves is true?

mr Goodwill [35]

Answer:

B. Mechanical waves must travel through a medium, but electromagnetic waves do not require a medium.

Explanation:

A wave is defined as any disturbance that transmits energy from one point to another.

Waves can be typically classified as either mechanical or electromagnetic waves.

Mechanical waves are waves that requires a medium for their propagation. In a vacuum, they cannot be propagated and would not cause any disturbance. An example is sound waves.

Electromagnetic waves do not require a medium to be propagated. They can pass through any substance in nature. Electromagnetic radiations belongs to this class.

4 0

3 years ago

Which of the following statements about recycling electronic waste is true?

otez555 [7]

Answer:

Explanation:

the correct one is D

5 0

2 years ago

Oxalic acid can remove rust (Fe2O3) caused by bathtub rings according to the reaction Fe2O3(s) - 6H2C2O4(aq) rightarrow 2Fe(C2O4

Katena32 [7]

Answer: The mass of rust that can be removed is 1.597 grams

Explanation:

To calculate the number of moles for given molarity, we use the equation:

$\text{Molarity of the solution}=\frac{\text{Moles of solute}}{\text{Volume of solution (in L)}}$ .....(1)

Molarity of oxalic acid solution = 0.1255 M

Volume of solution = $6.00\times 10^2mL$ = 600 mL = 0.600 L (Conversion factor: 1 L = 1000 mL)

Putting values in equation 1, we get:

$0.100M=\frac{\text{Moles of oxalic acid}}{0.600L}\\\\\text{Moles of oxalic acid}=(0.100mol/L\times 0.600L)=0.06mol$

For the given chemical reaction:

$Fe_2O_3(s)+6H_2C_2O_4(aq.)\rightarrow 2Fe(C_2O_4)_3^{3-}(aq.)+3H_2O(l)+6H^+(aq.)$

By Stoichiometry of the reaction:

6 moles of oxalic acid reacts with 1 mole of ferric oxide (rust)

So, 0.06 moles of oxalic acid will react with = $\frac{1}{6}\times 0.06=0.01mol$ of ferric oxide (rust)

To calculate the mass of rust for given number of moles, we use the equation:

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

Molar mass of rust (ferric oxide) = 159.7 g/mol

Moles of rust = 0.01 moles

Putting values in above equation, we get:

$0.01mol=\frac{\text{Mass of rust}}{159.7g/mol}\\\\\text{Mass of rust}=(0.01mol\times 159.7g/mol)=1.597g$

Hence, the mass of rust that can be removed is 1.597 grams

5 0

3 years ago

How many moles are in 75.0 grams of K2S?

notka56 [123]

Answer:

0.6802 mol

Explanation:

1 grams K2S = 0.00907 mol

0.00907 x 75 = 0.6802 mol

3 0

3 years ago

A beaker containing 80 grams of lead(ii) nitrate, pb(no3)2, in 100 grams of water has a temperature of 30 ºc. approximately how

sukhopar [10]

Answer:

14 g.

Explanation:

From the figure attached:

the solubility of lead(II) nitrate, Pb(NO₃)₂, in 100 grams of water has a temperature of 30ºC is (66 g).

When beaker containing 80 grams of lead(II) nitrate, Pb(NO₃)₂, in 100 grams of water has a temperature of 30ºC.

∴ The grams of the salt are undissolved, on the bottom of the beaker are (14 g).

4 0

3 years ago