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3 years ago

12

To reflect about a problem means to ask yourself about any possible ‘what ifs.’ Please select the best answer from the choices p

rovided T F

2 answers:

alukav5142 [94]3 years ago

5 0

Answer:

true

Explanation:

youre putting thought into problems

Naily [24]3 years ago

4 0

The answer is true true true

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In an experiment what unit of measurement would you use to demonstrate the law of conservation of mass

Ostrovityanka [42]

Answer:

Joule

Explanation:

When we think about the law of conservation of mass, we tend to think about the actual mass of objects. However we forget that energy can be turned into mass, and in turn, mass can be turned into energy. Sometimes there is a loss in mass, but energy is released into the environment which we can always see or measure. So therefore the most inclusive unit of measure to use when referring to the <em>law of conservation of mass</em> is in fact the unit for energy, the joule.

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3 years ago

What is true about all the elements in the same column of the periodic table

katrin2010 [14]

Each column is called a group.

<u>The elements in each group have the same number of electrons</u> in the outer orbital

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3 years ago

Read 2 more answers

Arrange these compounds by their expected boiling point. Highest boiling point Lowest boiling point CH3OH, CH3CI CH4.

PSYCHO15rus [73]

Answer: The given compounds are arranged according to decreasing boiling point as $CH_{3}OH > CH_{3}Cl > CH_{4}$ .

Explanation:

The temperature at which vapor pressure of a substance becomes equal to the atmospheric pressure is called boiling point.

Stronger is the intermolecular forces present the atoms of a molecule more heat will be required by it to break the bond between its atoms. Hence, more will the boiling point of the molecule.

In $CH_{3}OH$ (methanol), there is hydrogen bonding present which is a stronger force. So, it will have highest boiling point as compared to $CH_{3}Cl$ and $CH_{4}$ .

In $CH_{3}Cl$ (chloroform), there is more electronegative atom attached (Cl) is attached to less electronegative atom (C and H). So, electrons are more pulled towards the chlorine atom. So, boiling point of $CH_{3}Cl$ is more than methane $(CH_{4})$ .

Thus, we can conclude that given compounds are arranged according to decreasing boiling point as $CH_{3}OH > CH_{3}Cl > CH_{4}$ .

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3 years ago

Which statement is true according to the kinetic theory? Will mark brainliest

nevsk [136]

Answer:

$\boxed{\sf Option \ E}$

Explanation:

All the gases at the same temperature and mass have the same average kinetic energy.

If the masses were different, then the different gases will have different velocities. If the temperature was higher then there would be a greater motion, if the temperature was lower, then there would be less motion.

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3 years ago

Substance A undergoes a first order reaction A  B with a half- life of 20 min at 25 °C. If the initial concentration of A ([A]◦

nydimaria [60]

The concentration of A will be <em>0.34 mol·L⁻¹</em> after 60 min.

In a first-order reaction, the formula for the amount remaining after <em>n</em> half-lives is

$\text{[A]} = \frac{\text{[A]}_{0}}{2^{n}}\\$

If $t_{\frac{1}{2}} = \text{20 min}\\$

$n = \frac{t}{t_{\frac{1}{2}}} = \frac{\text{60 min}}{\text{20 min}}= \text{3.0}$

∴ $\text{[A]} = \frac{\text{2.7 mol/L}}{2^{3.0}} = \frac{\text{2.7 mol/L}}{8.0} = \textbf{0.34 mol/L}$

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3 years ago