A balloon that had a volume of 3.50 L at 25.0°C is placed in a hot room at 40.0°C. If the pressure remains constant at 1.00

What might law enforcement do to reduce attempts at deception when gaining a handwriting sample?

Anarel [89]

In order to decrease the chances of deception in acquiring a handwriting sample, what the law enforcement do is that, they ask they person to write as little as possible, write the passage only once and also gather the material that consist some of the similar words and phrases as the suspected document. Answer for this would be all of the above.

3 0

3 years ago

Does a animal cell have a cell wall and chloroplasts

sergiy2304 [10]

Answer:

Animal cells have centrosomes (or a pair of centrioles), and lysosomes, whereas plant cells do not. Plant cells have a cell wall, chloroplasts, plasmodesmata, and plastids used for storage, and a large central vacuole, whereas animal cells do not.

4 0

3 years ago

5. The atomic number of an element is equal to:

Degger [83]

A. the number of protons in the atoms

3 0

2 years ago

Read 2 more answers

Which of the following is a scientific question you could ask about shoes?

ankoles [38]

Answer:

D. Are there any running shoes that help people run faster?

Explanation:

because it's the question that more seems scientific.

i hope this helps

7 0

2 years ago

The most useful ore of aluminum is bauxite, in which Al is present as hydrated oxides, Al2O3⋅xH2O The number of kilowatt-hours o

vesna_86 [32]

Explanation:

According to Faraday's law, the amount of a substance deposited or liberated in electrolysis process is proportional to the quantity of electric charge passed and to the equivalent weight of the substance.

Formula to calculate the mass of substance liberated according to Faraday's law is as follows.

m = $(\frac{Q}{F})(\frac{M}{Z})$

where, m = mass of substance liberated at electrode

Q = electric charge passing through the substance

F = Faraday constant = 96,487 C $mol^{-1}$

M = molar mass of the substance

Z = valency number of ions of the substance

Since, it is given that mass is 3 kg or 3000 g (as 1 kg = 1000 g), molar mass of Al is 27, Z is 3.

Therefore, putting the values in the above formula as follows.

m = $(\frac{Q}{F})(\frac{M}{Z})$

3000 g = $(\frac{Q}{96,487 C mol^{-1}})(\frac{27}{3})$

Q = 32162333.33 C

As it is given that V = 4.50 Volt. Also, it is known that

Energy = $V \times Q$

Therefore, calculate the energy as follows.

Energy = $V \times Q$

= $4.50 V \times 32162333.33 C$

= 144730500 J

As it is known that $3.6 \times 10^{6}$ J = 1 KW Hr

So, convert 144730500 J into KW Hr as follows.

$\frac{144730500 J \times 1 KW Hr}{3600000 J}$

= 40.202 KW Hr

Thus, we can conclude that the number of kilowatt-hours of electricity required to produce 3.00 kg of aluminum from electrolysis of compounds from bauxite is 40.202 KW Hr when the applied emf is 4.50V.

7 0

3 years ago