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oee [108]
3 years ago
5

HELP I'LL GIVE YOU 15 POINTS CAUSE THAT'S ALL I'VE GOT, BUT I NEED IT PLEASE!

Chemistry
1 answer:
nekit [7.7K]3 years ago
4 0

All mixtures contain only one kind of atom.

~Mschmindy

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What describes Rutherford’s model of the atom?
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Rutherford's model shows that an atom is mostly empty space, with electrons orbiting a fixed, positively charged nucleus in set, predictable paths. ... It was after this that Rutherford began developing his model of the atom.
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3 years ago
Determine the number of moles of a aluminum sample containing 2.89E26 atoms.
Brut [27]

Answer:

Explanation:

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8 0
3 years ago
An important step in science is supporting a theory or idea without data. The questions we ask determine the type of data we col
san4es73 [151]

Answer:

What will happen to Uk if you double the mass?

Explanation:

Uk = 0.5 * m * v²

You see that both m and v are variable, which means that both m and v can be any number. Regardless of the numbers you put in for m or v, the formula to calculate the kinetic energy (Uk) remains valid.

You could ask

1. What will happen to Uk if you double the mass?

2. What will happen to Uk if you double the velocity?

please see and understand(!) that the relationship between Uk an v² is indeed the velocity squared....

EXTRA

Uk = 0.5 * m * (v)²

Suppose the m = 3kg and velocity = 5 m/s

What is the Uk?

Well if you know the formula you can use your calculator to find out:

Uk = 0.5 * m * (v)²

Uk = 0.5 * 3 * (5)²

Uk = 0.5 * 3 * 25

Uk = 37.5 kgm/s²

Again you ask what will happen to Uk if you double the velocity?

At first it was 5 m/s and now it doubles, which means it now has that value *2

The new velocity is 5 *2 = 10 m/s

Uk = 0.5 * m * (v)²

Uk = 0.5 * 3 * (10)²

Uk = 0.5 * 3 * 100

Uk = 150 kgm/s²

150 = 4 * 37.5

So now you see that if you double your velocity, the Uk will be 2² = 4 times as big !

3 0
3 years ago
Water softeners often replace calcium ions in hard water with sodium ions. since sodium compounds are soluble, the presence of s
Mamont248 [21]
% mass Na = (g Na / g H2O) x 100 
<span>g Na = (% mass Na)(g H2O) / 100 = (5.2 x 10^-4 g Na / g H2O) </span>

<span>2.4 g Na x (1 g H2O / 5.2 x 10^-4 g Na) = 4600 g Na </span>

<span>4600 g Na x (1 mL H2O / 1 g H2O) = 4600 mL H2O = 4.6 L H2O which is a little more than a gallon</span>
6 0
2 years ago
What volume in liters of 5.75×10−2 M KH2AsO4 contains 6.30 g KH2AsO4?
AnnZ [28]

Answer : The volume of solution is, 0.609 L

Explanation : Given,

Mass of KH_2AsO_4 = 6.30 g

Molar mass of KH_2AsO_4 = 180 g/mole

Concentration = 5.75\times 10^{-2}M

Molarity : It is defined as the number of moles of solute present in one liter of volume of solution.

Formula used :

\text{Molarity}=\frac{\text{Mass of }KH_2AsO_4}{\text{Molar mass of }KH_2AsO_4\times \text{Volume of solution (in L)}}

Now put all the given values in this formula, we get:

5.75\times 10^{-2}M=\frac{6.30g}{180g/mole\times \text{Volume of solution (in L)}}

\text{Volume of solution (in L)}=0.609L

Therefore, the volume of solution is, 0.609 L

3 0
3 years ago
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