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2 years ago

I NEED HELP! If you can

Chemistry

1 answer:

Kipish [7]2 years ago

4 0

Answer:

1. Chemical, Radiant, Heat

2. Mass, Speed, Heat

3. Mechanical, Heat, Chemical

4. Heat, Electrical, Radiant

Depending on whether or not you can only use the choices at the top.

Explanation:

1. Chemical, Radiant, Thermal

2.Mechanical, Elastic, Thermal

3. Chemical, Mechanical

4. Radiant, Electrical, Thermal

Mechanical energy because of the mixing and mashing of the teeth. https://www.solarschools.net/knowledge-bank/energy/types (check this website because I'm not sure if I'm right yet).

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The shadow zone exists because ?

lana66690 [7]

At almost the opposite point on the Earth's surface, the "P" waves reappear. The shadow zone exists because the waves are refracted as they pass through the boundary between the mantle and the core and are diverted from their original paths.

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3 years ago

These biological compounds are nonpolar and insoluble in water:

juin [17]

The biological compounds that are nonpolar and insoluble in water are lipids. It is a group of molecules that are naturally occurring which includes sterols, waxes, fats, fat-soluble vitamins and the like. These molecules are nonpolar molecules so basically the cannot be dissolved in a polar solvent like water.

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2 years ago

What is the Ka of a weak acid (HA) if the initial concentration of weak acid is 4.5 x 10-4 M and the pH is 6.87? (pick one)

rewona [7]

Answer:

Ka = $4.04 \times 10^{-11}$

Explanation:

Initial concentration of weak acid = $4.5 \times 10^{-4}\ M$

pH = 6.87

$pH = -log[H^+]$

$[H^+]=10^{-pH}$

$[H^+]=10^{-6.87}=1.35 \times 10^{-7}\ M$

HA dissociated as:

$HA \leftrightharpoons H^+ + A^{-}$

(0.00045 - x) x x

[HA] at equilibrium = (0.00045 - x) M

x = $1.35 \times 10^{-7}\ M$

$Ka = \frac{[H^+][A^{-}]}{[HA]}$

$Ka = \frac{(1.35 \times 10^{-7})^2}{0.00045 - 0.000000135}$

0.000000135 <<< 0.00045

$Therefore, Ka = \frac{(1.35 \times 10^{-7})^2}{0.00045 } = 4.04 \times 10^{-11}$

5 0

2 years ago

When polonium-210 emits an alpha particle, the child isotope has an atomic mass of

Sergeeva-Olga [200]

Answer: The child isotope has an atomic mass of 206.

Explanation:

Alpha decay : When a larger nuclei decays into smaller nuclei by releasing alpha particle. In this process, the mass number and atomic number is reduced by 4 and 2 units respectively.

General representation of an element is given as: $_Z^A\textrm{X}$