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3 years ago

What will happen if a peeled banana is put on a hotplate? Will it undergo a physical or a chemical change?

1 answer:

6 0

I would say physical, because a physical change is affecting the form of a chemical substance, but not it's chemical makeup.

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A balloon filled with 0.500 L of air at sea level is submerged in the water to a depth that produces a pressure of 3.25 atm. Wha

mario62 [17]

Answer:

Option a . 0.154L

Explanation:

P₁ . V₁ = P₂ . V₂

when we have constant temperature and constant moles for a certain gas.

At sea level, pressure is 1 atm so:

0.5 L . 1atm = V₂ . 3.25 atm

(0.5L . 1atm) / 3.25 atm = 0.154 L

6 0

3 years ago

Consider the following reaction:2NOBr(g) 2NO(g) + Br2(g)If 0.412 moles of NOBr(g), 0.678 moles of NO, and 0.224 moles of Br2 are

Vaselesa [24]

Answer: $K_c=0.0587M$

Explanation: The given chemical reaction is:

$2NOBr(g)\rightleftharpoons 2NO(g)+Br_2(g)$

Equilibrium constant (Kc) in general is written as:

$K_c=\frac{[products]}{[reactants]}$

Note:- Coefficients are written as their powers

So, the Kc expression for the above reaction will be:

$K_c=\frac{[NO]^2[Br_2]}{[NOBr]^2}$

Equilibrium moles are given for all of them. Let's divide the moles by given liters to get the concentrations.

$[NOBr]=\frac{0.412mol}{10.3L}$ = 0.040 M

$[NO]=\frac{0.678mol}{10.3L}$ = 0.0658 M

$[Br_2]=\frac{0.224mol}{10.3L}$ = 0.0217 M

Plug in the values in the equilibrium expression to calculate Kc.

$K_c=\frac{(0.0658M)^2(0.0217M)}{(0.040M)^2}$

$K_c=0.0587M$

4 0

3 years ago

Choose the more metallic element from each pair.

Paraphin [41]

Answer:

Explanation:

CI or O

Carla Vista Company has the following information available for September 2020.

Unit selling price of video game consoles $410

Unit variable costs $328

Total fixed costs $36,900

Units sold 600

Compute the unit contribution margin.

Unit contribution margin enter the unit contribution margin

Prepare a CVP income statement that shows both total and per unit amounts.

Compute Carla Vistaâ€™ break-even point in units.

Break-even point in units enter Break-even point in units units

Prepare a CVP income statement for the break-even point that shows both total and per unit amounts.

5 0

3 years ago

Boiling point of a solution formed when 15.2 grams of CaCl2 dissolves in 57.0 g of water. kB= 0.512 c/m.

Nookie1986 [14]

100.133 degree celsius is the boiling point of the solution formed when 15.2 grams of CaCl2 dissolves in 57.0 g of water.

Explanation:

Balanced eaquation for the reaction

CaCl2 + 2H20 ⇒ Ca(OH)2 + HCl

given:

mass of CaCl2 = 15.2 grams

mass of the solution = 57 grams

Kb (molal elevation constant) = 0.512 c/m

i = vont hoff factor is 1 as 1 mole of the substance is given as product.

Molality is calculated as:

molality = $\frac{grams of solute}{grams of solution}$

= $\frac{15.2}{57}$

= 0.26 M

Boiling point is calculated as:

ΔT = i x Kb x M

= 1 x 0.512 x 0.26

= 0.133 degrees

The boiling point of the solution will be:

100 degrees + 0.133 degrees (100 degrees is the boiling point of water)

= 100.133 degree celcius is the boiling point of mixture formed.

4 0

3 years ago

Sudhi is studying the motion of a toy car. She places the car in the middle of the ramp and releases it.

weeeeeb [17]

I believe the answer is C

5 0

3 years ago

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