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3 years ago

14

you have a friend who is using a recipe for flat from american cookbook you notice that he set your over temperature at 175F° wh

at you advise him to do?

1 answer:

tresset_1 [31]3 years ago

7 0

Answer:

I will give them advice, that do the power of flame low....

Explanation:

thanks.

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Which statement gives you enough information to say that the atom is electrically neutral? Question 17 options: A) The atom has

Degger [83]

As the atom has 7 protons and 7 electrons, it can be referred to as neutral atom, the correct option is B.

<h3>What is a neutral atom?</h3>

When an atom has an equivalent number of electrons as well as protons, it has an equal number of electrons with negative electric charges and protons with positive electric charges.

As a result, the total electric charge of the atom is zero, and it is said to be neutral. As a result, all elements in the periodic table have neutral atoms.

Because the atom has 7 protons and 7 electrons, it is known as a neutral atom.

Thus, the correct option is B.

For more details regarding neutral atom, visit:

brainly.com/question/5308494

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3 0

1 year ago

Consider Al at room temperature. Its electron density is n = 18 x 1022 cm-3 and its electrical resistivity is rho = 2.45 μΩ-cm.

Marianna [84]

Answer:

$\tau=1.28968\times 10^{-8}\ s$ is the electron relaxation time

$l=9.6726\times 10^{-4}\ m$ is the mean free path

Explanation:

Given:

electron density of aluminium at room temperature, $n=18\times 10^{22}\ cm^{-3}$

resistivity of aluminium, $\rho=2.45\times 10^{-8}\ \Omega.m$

<u>From the Drude's model we have:</u>

$\tau=\frac{m}{\rho.n.q^2}$

where:

$\tau=$ electron relaxation time

$m=$ mass of a charge

$q=$ magnitude of a charge

Putting respective values for electron:

$\tau=\frac{9.1\times 10^{-31}}{2.45\times 10^{-8}\times 18\times 10^{22}\times (1.6\times 10^{-19})^2}$

$\tau=8.0605\times 10^{-9}\ s$

<u>Mean free path is given as:</u>

$l=v_a.\tau$

where:

$l=$ mean free path

$v_a=$ average velocity of electrons

Now we have the the general value of average velocity of electrons at room temperature:

$v_a=120000\ m.s^{-1}$

So,

$l=120000\times 8.0605\times 10^{-9}$

$l=9.6726\times 10^{-4}\ m$

8 0

3 years ago

A 3.5 gram sample of a radioactive element was formed in a 1960 explosion of an atomic bomb at Johnson Island in the Pacific tes

Annette [7]

The answer is 0.62g.
Solution:
From year 1960 to year 2030, it has been
2030-1960 = 70 years

The half-life of the radioactive element is 28 years, then the sample will go through
70 years * (1 half-life/28 years) = 2.5 half-lives

Starting with a 3.5 gram sample, we will have
3.5*(1/2) after one half-life passes
3.5*(1/2) * (1/2) = 3.5*(1/4) after two half-lives pass
3.5*(1/4) * (1/2) = 3.5*(1/8) after three half-lives pass and so on

Therefore, we can write the remaining amount of the sample after the number n of half-lives have passed as
mass of sample = initial mass of sample/2^n

The mass of the remaining sample for n = 2.5half-lives can be now calculated as
mass of sample = 3.5 grams / 2^2.5 = 0.62 g

5 0

3 years ago

Friction depends on the types of surfaces involved and how hard the surfaces push together.

skad [1K]

True, if you have rough surface the more friction you have. The More slipery, less friction.

6 0

3 years ago

Read 2 more answers

Hydrochloric acid reacts with sodium hydroxide to form water and sodium chloride.Hydrochloric acids is an extremely acidic,clear

Luden [163]

Answer:

Hydrochloric acid is a strong acid with a distinct pungent smell and it is highly reactive while Sodium hydroxide is a strong base and it is fully Ionic

6 0

3 years ago