CHEMISTRY HIGH SCHOOL

The electrons used in bonding are known as a. bonding electrons
b. proton
c. neutron
d.moron

Answers

Answer 1

Answer:

Answer:

bonding electron

Explanation:

because they will bond together.

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What are the main characteristics for the definition of work?

Answers

Answer:

1-There Must be some displacement in the direction of force. 2-Angle between force and displacement is 0°.

Exactly how much time must elapse before 16 grams of potassium-42decays, leaving 2 grams of the original isotope?(1) 8 × 12.4 hours (3) 3 × 12.4 hours(2) 2 × 12.4 hours (4) 4 × 12.4 hours

Answers

The answer is (3) 3 × 12.4 hours

To calculate this, we will use two equations:
$(1/2) ^(n) =x$
$t_(1/2) = (t)/(n)$
where:
n - number of half-lives
x - remained amount of the sample, in decimals
$t_(1/2)$ - half-life length
t - total time elapsed.

First, we have to calculate x and n. x is remained amount of the sample, so if at the beginning were 16 grams of potassium-42, and now it remained 2 grams, then x is:
2 grams : x % = 16 grams : 100 %
x = 2 grams × 100 percent ÷ 16 grams
x = 12.5% = 0.125

Thus:
$(1/2) ^(n) =x$
$(0.5) ^(n) =0.125$
$n*log(0.5)=log(0.125)$
$n= (log(0.5))/(log(0.125))$
$n=3$

It is known that the half-life of potassium-42 is 12.36 ≈ 12.4 hours.
Thus:
$t_(1/2) = 12.4$
$t_(1/2) *n = t$
$t= 12.4*3$

Therefore, it must elapse 3 × 12.4 hours before 16 grams of potassium-42 decays, leaving 2 grams of the original isotope

Answer:

The answer is (3) 3 × 12.4 hours

Marshall determines that a gas has a gauge pressure of 276 kpa what's the absolute pressure of the gas

Answers

A gauge records the pressure over atmospheric pressure (0kpa on the gauge is actually the atmospheric pressure and a reading of 276kpa is 276kpa over atmospheric pressure). That means that means that to find absolute pressure you just add atmospheric pressure (around 1atm (101kpa)) to 286kpa to get 387kpa. I hope this helps.

Based on the Arrhenius theory, when potassiumhydroxide dissolves in water, the only negative
ion in the aqueous solution is
(1) O2 (aq) (3) H (aq)
(2) OH2 (aq) (4) OH (aq)

Answers

Answer : The correct option is, (4) $OH^-(aq)$ .

Explanation :

According to the Arrhenius theory, an acid is a substance that ionizes in water to gives $H^+$ ions (hydronium ions or hydrogen ions) and a base is a substance which ionizes in water to gives $OH^-$ ions (hydroxide ions).

As we know that when the potassium hydroxide (KOH) dissolves in water or ionizes in water to gives $OH^-$ ions (hydroxide ions) and $K^+$ ions (potassium ion). That means $OH^-$ ion is a negative ion in aqueous solution and $K^+$ ions is a positive ion in aqueous solution.

Hence, the correct option is, (4) $OH^-(aq)$ .

(4) $OH^(-)$ (aq)

That's the answer.

The troposphere is warmed by the _____.energy of the entire solar system
incoming radiation of the sun
radiated heat from the Earth's surface
atmospheric air circulation
help plz

Answers

The correct answer to the question stated above is the third option which is: radiated heat from the Earth's surface.
The troposphere is the lowest layer of Earth's atmosphere.
The troposphere is heated from below. Sunlight warms the ground or ocean, which in turn radiates the heat into the air right above it.
Therefore, the troposphere is warmed by the radiated heat from the Earth's surface.

Answer:

radiated heat from the Earth's surface

Explanation:

I had this same question and trust me this is the correct answer

How many molecules are in 165 g of carbon dioxide?

Answers

Answer: $22.6 * 10^(23)$ molecules

Explanation:

To calculate the moles, we use the equation:

$\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}$

For $CO_2$

Given mass= 165 g

Molar mass of $CO_2$ = 44 g/mol

Putting values in above equation, we get:

$\text{Moles of}CO_2 =(165g)/(44g/mol)=3.75mol$

According to avogadro's law, 1 mole of every substance weighs equal to the molecular mass and contains avogadro's number $6.023* 10^(23)$ of particles.