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3 years ago

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Cecil is working with samples of chlorine (Cl), oxygen (O), bromine (Br), and silver (Ag). The samples are all at room temperatu

re. Which substance is most likely the most dense?

1 answer:

Tpy6a [65]3 years ago

4 0

Answer:

itsy I just got the tests back and I got it right letterc

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Boyle's Law states that when a sample of gas is compressed at a constant temperature, the pressure P and volume V satisfy the eq

____ [38]

Answer:

The gas is decreasing at a rate of 50 cubic centimeters per minute.

Explanation:

The Boyle's Law is represented by the following expression:

$P\cdot V = k$ (1)

Where:

$P$ - Pressure, in kilopascals.

$V$ - Volume, in cubic centimeters.

$k$ - Proportionality constant, in kilopascal-cubic centimeters.

By definitions of rate of change and implicit differentiation, we derive the following differential equation:

$\dot P \cdot V + P\cdot \dot V = 0$ (2)

Where:

$\dot P$ - Rate of change of the pressure, in kilopascals per minute.

$\dot V$ - Rate of change of the volume, in cubic centimeters per minute.

Then, we clear the rate of change of the volume within (2):

$P\cdot \dot V = -\dot P\cdot V$

$\dot V = -\left(\frac{\dot P}{P} \right) \cdot V$

If we know that $P = 180\,kPa$ , $\dot P = 30\,\frac{kPa}{min}$ and $V = 300\,cm^{3}$ , then the rate of change of the volume is:

$\dot V = -\left(\frac{\dot P}{P} \right) \cdot V$

$\dot V = -50\,\frac{cm^{3}}{min}$

The gas is decreasing at a rate of 50 cubic centimeters per minute.

3 0

3 years ago

What's the balanced equation for magnesium and hydrochloric acid?

Roman55 [17]

Mg + 2 HCl ------> MgCl₂ +H₂O

6 0

4 years ago

Please please help!

ratelena [41]

The mass percent of potassium chloride is 1.386%

<u><em>calculation</em></u>

mass percent = actual mass/ Theoretical mass x 100

Actual mass = 9.35 g

Theoretical mass is calculated as below

Step 1 : write the equation for reaction

KCl + H₂O → KOH + HCl

Step 2: find the moles of H₂O

moles = mass÷ molar mass

The molar mass of H₂O = (2 x1 ) +(16) = 18 g/mol

moles is therefore = 162.98 g÷ 18 g/mol =9.054 moles

Step 3: use the mole ratio to determine the moles of KCl

KCl: H₂O is 1:1 therefore the moles of KCl is also = 9.054 moles

Step 4: find the theoretical mass of KCl

mass = moles x molar mass

from periodic table the molar mass of KCl = 39 +35.5 =74.5 g/mol

mass = 9.054 moles x 74.5 g/mol =674.5 g

Theoretical mass is therefore = 9.35 g/ 674.5 g x 100 = 1.386%

3 0

4 years ago

A pan containing 40 grams of water was allowed to cool from a temperature of 91 degrees C. If the amount of heat released is 130

liraira [26]

Answer:

Final temperature is 83.236 °C.

Explanation:

Let final temperature to be 'T'

There is a theorem :

ΔQ = m·s·ΔT

ΔQ : Heat exchange = -1300 J (<em>it is negative because heat is released</em>)

m : mass which exchanges heat = 40 grams

s : specific heat capacity of water = 4.186 J/grams °C = 1 Calories/grams °C

ΔT : Change in temperature = T - 91°

-1300 = 40 × 4.186 × (T-91)

$\mathrm{(T-91)=-\frac{1300}{40\times4.186}}$

$\mathrm{(T-91)\approx-7.764}$

$\mathbf{T\approx83.236 \ ^{0}C}$

3 0

3 years ago

Substances with strong intermolecular bonds vaporize

ikadub [295]

Slower should be the answer for this

4 0

4 years ago