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3 years ago

The table below gives the numbers of protons, electrons, and neutrons in four atoms.

Chemistry

2 answers:

PolarNik [594]3 years ago

4 0

Answer:

Atom 3

Explanation:

Protons have a +1 charge, electrons have a -1 charge, and neutrons have no charge and are therefore neutral. The charges will cancel each other when equal. To determine which atom has the a -1 charge, find the atom that has one more electron than it has protons.

Nana76 [90]3 years ago

4 0

Question:

Based on the table, which atom has a charge of –1?

Answer:

Atom 3

Explanation:

I took the test on Edgenuity (2020) and got it correct. Hope this helps you! :)

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Question 4

nata0808 [166]

Answer:

A. She can run the same distance in a shorter amount of time.

Explanation:

Speed can be computed with the formula:

$v = \dfrac{d}{t}$

Where:

v = speed

d = distance

t = time

So if you look at the formula, distance there tells you how far an object has traveled, and the time tells us how long it took to cover that distance. As you can see, speed and time are inversely proportional. This means that as one goes up, the other goes down. So if we reduce time travelling a certain distance, the speed increases.

3 0

3 years ago

Is it better for an element to be more abundant or less abundant?

PIT_PIT [208]

I believe it's better for it to be more abundant because it's better to have more then less. Take water as an example. Water is an important factor to our survival and if we didn't have enough of that we would be in trouble. Or if we needed food but there wasn't enough more people would be dying from starvation. It's better to have a little more than a little less.

8 0

3 years ago

What os the formula for hexaboron tetrabromide

LekaFEV [45]

Answer:

B6Br4

Explanation:

Chemical formula gives a representation of the number of atoms that each element in a compound or molecule. In this question which is asking to give the formula of hexaboron tetrabromide, the hexa means 6 while the tetra means four.

Since the number of atoms of each element is written as a prefix before the main element, this means that the chemical formula of hexaboron tetrabromide will be B6Br4.

6 0

3 years ago

A mixture of 14.0 grams of H2, 84.0 grams of N2, and 64.0 grams of O2 are placed in a flask. The partial pressure of the O2 is 7

Hitman42 [59]

Answer:

$P_{tot}=465.27torr$

Explanation:

Hello there!

In this case, according to the given information, it will be possible for us to use the Dalton's law, in order to solve this problem. However, we first need to calculate the mole fraction of oxygen by firstly calculating the moles of each gas:

$n_{H_2}=\frac{14.0g}{2.02g/mol} =6.93mol\\\\n_{N_2}=\frac{84.0g}{28.02g/mol}=3.00mol\\\\n_{O_2}=\frac{64.0}{16.00g/mol} =2.00mol$

Next, we calculate such mole fraction as follows:

$x_{O_2}=\frac{2}{6.93+3+2} =0.168$

Then, given the following equation:

$P_{O_2}=P_{tot}*x_{O_2}$

So we solve for the total pressure as follows:

$P_{tot}=\frac{P_{O_2}}{x_{O_2}} \\\\P_{tot}=\frac{78.00torr}{0.168} \\\\P_{tot}=465.27torr$

Regards!

6 0

3 years ago

Consider the reaction when aqueous solutions of magnesium sulfate and chromium(iii) acetate are combined. (use the solubility ru

WARRIOR [948]

Answer : When we mix the aqueous solutions of magnesium sulfate with chromium acetate we get the following reaction :-

$MgSO _{4} + Cr (C _{2}H _{3}O _{2}) _{2} ----\ \textgreater \ CrSO _{4} + Mg(C _{2}H _{3}O _{2}) _{2}$

It is an example of a displacement reaction that takes place. According to the OWL solubility preparation rules all the reactants are soluble and hence the reaction occurs.

The net ionic equation of the reaction is :-

$SO _{4} ^{-2} _{(aq.)} + Cr^{+2} _{(aq.)} ----\ \textgreater \ CrSO_{4}_{(s)}$

7 0

3 years ago