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Svet_ta [14]
3 years ago
14

Help me answer these science questions plz help plzzz questions 18,20,21

Chemistry
1 answer:
zepelin [54]3 years ago
8 0
Idk 18 but here is 20

conductor-a substance that readily conducts
insulator-a substance that does not readily allow the passage of heat or sound
ammeter-an instrument for measuring electric current in amperes.
voltmeter- an instrument for measuring electric potential in volts
current-a flow of electricity which results from the ordered directional movement of electrically charged particles.
potential difference-the difference of electrical potential between two points.
ohmic resistor- resistors that have a constant resistance
non-ohmic resistor- a resistor that's resistance increases as the current increase
power-the capacity or ability to direct or influence the behavior of others or the course of events.
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3 years ago
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Use the atom builder interactive to identify each nucleus. Two protons represented as purple spheres and one neutron represented
aleksandr82 [10.1K]

Answer:

\frac{3}{2}He

\frac{6}{2} He

\frac{7}{4}Be

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Explanation:

In the first nucleus we are told that there are two protons and one neutron. Let us remember that the mass number = number of protons + number of neutrons.

This implies that, for the first specie the mass number is 3, for the second specie the mass number is 6 and the third specie has a mass number of 7 and so on. The mass number is indicated as a superscript.

The atomic number is the number of protons in the nucleus of the atom and helps us to identify the atom. It is always written as a subscript as shown.

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3 years ago
Which of the following statements is incorrect:
Valentin [98]

Answer:

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What are some different things that can cause weathering?
stiv31 [10]
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5 0
4 years ago
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If only 0.186 g of Ca(OH)2 dissolves in enough water to give 0.230 L of aqueous solution at a given temperature, what is the Ksp
Lilit [14]

Answer:

Ksp=5.20x10^{-6}

Explanation:

Hello there!

In this case, according to the solubility equilibrium of calcium hydroxide:

Ca(OH)_2\rightleftharpoons Ca^{2+}+2OH^-

Whereas the equilibrium expression is:

Ksp=[Ca^{2+}][OH^-]^2

It is firstly necessary to calculate the molar solubility given the grams and volume of the dissolved solute:

s=\frac{0.186g/(74.09g/mol)}{0.230L}=0.0109M

Now, according to the Ksp expression, we plug in s as the solubility to obtain:

Ksp=(s)(2s)^2\\\\Ksp=(0.109)(2*0.0109)^2\\\\Ksp=5.20x10^{-6}

Regards!

8 0
3 years ago
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