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3 years ago

Beta particles are ????????????????????

1 answer:

Rudiy273 years ago

3 0

Beta radiation takes the form of either an electron or a positron (a particle with the size and mass of an electron, but with a positive charge) being emitted from an atom. Due to the smaller mass, it is able to travel further in air, up to a few meters, and can be stopped by a thick piece of plastic, or even a stack of paper. It can penetrate skin a few centimeters, posing somewhat of an external health risk. However, the main threat is still primarily from internal emission from ingested material.

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If silicon has a charge of +4 and oxygen has a charge of -2, what is the total charge on this structure?

Ratling [72]

Answer:

Zero with the subscripts, +2 without them.

Explanation:

Hello!

In this case, since we consider that two silicon are bonded with four oxygen atoms to form silicon oxide according to the following chemical equation:

$Si^{4+}+O^{2-}\rightarrow Si_2O_4$

It is also possible to realize it can be simplified to obtain:

$SiO_2$

Which means that the total charge with the subscripts is zero, and without the subscripts +2 (+4-2).

Best regards!

7 0

3 years ago

Consider a mixture of NaCl and NaNO3 that is 31.8% Na by mass. Calculate the percentage by mass of NaCl in the mixture.

lutik1710 [3]

Answer: The percentage by mass of NaCl in the mixture is 38.5 %

Explanation:

To calculate the mass percentage of element in compound, we use the equation:

$\text{Mass percent of element}=\frac{\text{Mass of element}}{\text{Mass of compound}}\times 100$ .......(1)

For NaCl:

Mass of sodium element = 23 g

Mass of NaCl = 58.5 g

Putting values in equation 1, we get:

$\text{Mass percent of sodium element}=\frac{23g}{58.5g}\times 100=39.32\%$

Mass fraction of sodium metal in NaCl = 0.3932

For $NaNO_3$ :

Mass of sodium element = 23 g

Mass of $NaNO_3$ = 85 g

Putting values in equation 1, we get:

$\text{Mass percent of sodium element}=\frac{23g}{85g}\times 100=27.1\%$

Mass fraction of sodium metal in sodium nitrate = 0.271

Let us assume the mass fraction of NaCl in the mixture is 'x'

So, the mass fraction of $NaNO_3$ in the mixture will be '(1-x)'

We are given:

Percent by mass of Na in the mixture = 31.8 %

Mass fraction of Na in the mixture = 0.318

Evaluating the mass fraction of NaCl in the mixture:

$[(x\times 0.3932)+((1-x)\times 0.271)]=0.318$

x = 0.385

Percent by mass of NaCl in the mixture will be = $(0.385\times 100)=38.5\%$

Hence, the percentage by mass of NaCl in the mixture is 38.5 %

4 0

3 years ago

PLEASE HELP WITH QUESTION #3!!!!

Margarita [4]

Answer:

40 degrees

Explanation:

7 0

3 years ago

How does the Electoral College help to ensure that citizens in all states have a voice in the election of the

vredina [299]

Answer:

See below

Explanation:

The electoral college ensures that the most populated states can't always pick the next president. States that have the most population would be able to skew the elections by cancelling out several other less populated state's voters. One large city could cancel out every vote from the state of Rhode Island.

With the electoral college, each state has a given number of votes to cast for a president. Some states can split their college votes while others cast all votes for the same candidate.

If you look at Pennsylvania in 2020 as an example, they have 20 electoral votes. Pennsylvania does not split their votes so all go to just one candidate. In the measurement of votes, it might show that candidate A got 51% of the votes and candidate B got 49%. The 20 electoral votes would all go to candidate A and candidate B gets nothing. Candidate B may have gotten millions of individual votes within the state but that no longer matters. Candidate A won the state so gets all 20 electoral votes. If the country went by the individual vote, Candidate B would keep all those votes he got from the 2 or 3 large cities in Pennsylvania.

It would be easy to see that if you only counted the individual votes (called the popular vote), a candidate could compile more votes from all of the states even though the candidate did not win that state by the majority vote. The electoral college makes sure that a candidate cannot carry those votes from the state that they lost.

If elections were based on this popular vote, then most of the states with small populations would barely affect the outcome of an election. The popularity vote would ensure that the states with the largest populated cities would always control who gets elected.

It would especially be detrimental in todays age since most large cities are almost always voting for just one party.

5 0

3 years ago

Hi can u help me with this?

xxTIMURxx [149]

Answer:

evaporation

Explanation:

When water absorbs enough heat, it becomes a gas (water vapor). This process is called evaporation

4 0

3 years ago

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