Ask question

Ask question

All categories

Svetradugi [14.3K]

4 years ago

9

A scientist uses an accelerator and high energy electrons to study the particles inside the protons of a helium atom. What parti

cles is the scientist studying? A. the He neutrons B. the He nucleus C.the He electrons D.the He quarks

1 answer:

marissa [1.9K]4 years ago

6 0

<span>B. the He nucleus C.the He electrons D.the He quarks</span>

You might be interested in

A 0.25-mol sample of a weak acid with an unknown Pka was combined with 10.0-mL of 3.00 M KOH, and the resulting solution was dil

Masteriza [31]

Answer : The value of $pK_a$ of the weak acid is, 4.72

Explanation :

First we have to calculate the moles of KOH.

$\text{Moles of }KOH=\text{Concentration of }KOH\times \text{Volume of solution}$

$\text{Moles of }KOH=3.00M\times 10.0mL=30mmol=0.03mol$

Now we have to calculate the value of $pK_a$ of the weak acid.

The equilibrium chemical reaction is:

$HA+KOH\rightleftharpoons HK+H_2O$

Initial moles 0.25 0.03 0

At eqm. (0.25-0.03) 0.03 0.03

= 0.22

Using Henderson Hesselbach equation :

$pH=pK_a+\log \frac{[Salt]}{[Acid]}$

$pH=pK_a+\log \frac{[HK]}{[HA]}$

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

$3.85=pK_a+\log (\frac{0.03}{0.22})$

$pK_a=4.72$

Therefore, the value of $pK_a$ of the weak acid is, 4.72

7 0

3 years ago

Name the following alkenes using systematic names.

swat32

Idkvfffftttttf yyyrrr

3 0

4 years ago

What makes tides like waves and the water rising

cluponka [151]

The moon affects the tides and water levels

7 0

3 years ago

A rigid 8.77L tanks contains 1.45 moles oxygen at 20°C. what is the pressure in atm?

alexdok [17]

1) use the formula PV=nRT
2) Plug in given values: P(8.77 L)= (1.45 mol)(0.0821)(293 K)
3) isolate P: P= (1.45x.0821x293)/(8.77)
4) solve: P=3.98 atm

5 0

4 years ago

What happens to the molecules within a gas when the gas condenses

mixas84 [53]

When something compresses, it means that the molecules within it suddenly came really close to one another.

6 0

3 years ago