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4 years ago

All changes in state require energy to be added or taken away true or false

Chemistry

2 answers:

Lyrx [107]4 years ago

5 0

Answer:

True

Explanation:

All changes in phase of matter require the temperature of the substance to change

tiny-mole [99]4 years ago

3 0

Answer:

True

Explanation:

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Which formula contains a metal and a nonmetal? SO2 MgO CO H2O

eduard

Answer:

MgO

Explanation:

Mg, which is magnesium, is considered a metal, when paired with Oxygen, which is a gas, it creates magnesium oxide, and the formula itself is a pairing of a metal with a nonmetal

3 0

4 years ago

Read 2 more answers

an engineer wishes to design a container that will hold 12.0 mol of ethane at a pressure no greater than 5.00x10*2 kPa and a tem

OleMash [197]

Answer:

The minimum volume of the container is 0.0649 cubic meters, which is the same as 64.9 liters.

Explanation:

Assume that ethane behaves as an ideal gas under these conditions.

By the ideal gas law,

$P\cdot V = n\cdot R\cdot T$ ,

$\displaystyle V = \frac{n\cdot R\cdot T}{P}$ .

where

$P$ is the pressure of the gas,
$V$ is the volume of the gas,
$n$ is the number of moles of particles in this gas,
$R$ is the ideal gas constant, and
$T$ is the absolute temperature of the gas (in degrees Kelvins.)

The numerical value of $R$ will be $8.314$ if $P$ , $V$ , and $T$ are in SI units. Convert these values to SI units:

$P =\rm 5.00\times 10^{2}\;kPa = 5.00\times 10^{2}\times 10^{3}\; Pa = 5.00\times 10^{5}\; Pa$ ;
$V$ shall be in cubic meters, $\rm m^{3}$ ;
$T = \rm 52.0 \textdegree C = (52.0 + 273.15)\; K = 325.15\; K$ .

Apply the ideal gas law:

$\displaystyle \begin{aligned}V &= \frac{n\cdot R\cdot T}{P}\\ &= \frac{12.0\times 8.314\times 325.15}{5.00\times 10^{5}}\\ &= \rm 0.0649\; m^{3} \\ &= \rm (0.0649\times 10^{3})\; L \\ &=\rm 64.9\; L\end{aligned}$ .

4 0

4 years ago

These reactions can also be reversed, breaking the large molecules into its individual molecules. what substance would need to b

lesantik [10]

The appropriate response is water. This reversible reaction can be broken into two responses. These two responses are happening all the while, which implies that the reactants are responding to yield the items, as the items are responding to deliver the reactants. Crashes of the responding atoms cause substance responses in a shut framework.

6 0

4 years ago

The following equation represents the type of reaction called

Eva8 [605]

Answer: C REDUCTION

Explanation:

Guessed after knowing oxidation isn't the answer. Got right

7 0

3 years ago

A student went to the dentist and found out that he had a cavity. He always brushes his teeth twice a day, so he didn't understa

Free_Kalibri [48]

Answer:

The drinks that the student should avoid - if he wants to avoid damage to his teeth - are drinks C and E, since they are acidic, according to their pH.

Explanation:

pH measures the acidity or alkalinity of a solution, taking into account the amount of hydrogen ions present in it, and established on a scale that goes from 0 to 14.

In chemistry, pH is derived from the formula that indicates:

pH = - Log₁₀ αH⁺ , where α is the activity of hydrogen ions.

A solution with a pH of 7 is considered neutral, above this value it is an acidic solution and below this value it is called acidic.

According to this:

Acidic drinks are: drink C (5.3) and E (2.4).
The basic drinks are: drink A (11.9) and drink D (9.8).
The neutral drink is the drink B (7), which corresponds to water.

4 0

3 years ago