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1 year ago

Katrina tried to take pictures with her cell phone but discovered that its battery was dead. What happened to the battery?

Chemistry

2 answers:

Aleks04 [339]1 year ago

4 0

C. All the energy stored in the battery had been transformed.

Mandarinka [93]1 year ago

4 0

C. All the energy stored in the battery had been transferred

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A chemist prepares a solution of sodium thiosulfate by measuring out of sodium thiosulfate into a volumetric flask and filling t

marshall27 [118]

Mass of sodium thiosulfate $Na_{2}S_{2}O_{3}$ is 110. g

Volume of the solution is 350. mL

Calculating the moles of sodium thiosulfate:

$110. g Na_{2}S_{2}O_{3} * \frac{1 mol Na_{2}S_{2}O_{3}}{158.1 g Na_{2}S_{2}O_{3}}$ = 0.696 mol $Na_{2}S_{2}O_{3}$

Converting the volume of solution to L:

$350. mL * \frac{1 L}{1000 mL} = 0.350 L$

Finding out the concentration of solution in molarity:

$\frac{0.696 mol}{0.350 L} = 1.99 mol/L$

4 0

3 years ago

The boiling point of methanol is 64 7°C. Its melting point is -976°C. At room temperature (-25°C), methanol is in which state?

marissa [1.9K]

At -25 °C, methanol, whose boiling point is 64.7 °C and its melting point is -97.6 °C, is in the liquid state.

The melting point is the temperature at which a substance passes from solid to liquid. Below the melting point, a substance is in the solid state. Above the melting point, a substance is in the liquid or gas state.

The boiling point is the temperature at which a substance passes from liquid to gas. Below the boiling point, a substance is solid or liquid. Above the boiling point, a substance is in the gas state.

At -25 °C, methanol is above the melting point (-97.6 °C) and below the boiling point (64.7 °C). Thus, it is in the liquid state.

At -25 °C, methanol, whose boiling point is 64.7 °C and its melting point is -97.6 °C, is in the liquid state.

You can learn more about the melting and boiling points here: brainly.com/question/5753603?referrer=searchResults

3 0

2 years ago

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HELP I WILL GIVE YOU BRAINLEST!

vaieri [72.5K]

Answer:

it is blury

Explanation:

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3 years ago

Which of these solutions is the most basic?

dalvyx [7]

<h2>Question↷</h2>

Which of these solutions is the most basic?

[OH-] = 4.3 x 10-9 M

[OH-] = 2.8 x 10-11 M

[OH-] = 6.7 x 10-10 M

[OH-] = 1.0 x 10-5 M

<h2>Answer↷</h2>

<u>[OH-] = 1.0 x 10-5 M</u> ✓

<h2>Solution↷</h2>

[OH-] = 4.3 x 10-9 M

[OH-] = 4.3 x 10^-9 M
pOH = - log [OH^1-]
pOH = - log [4.3 x 10^-9]
pOH = 8.36
pH = 14- 8.36
pH = 5.64

_______________________________________

[OH-] = 2.8 x 10-11 M

[OH-] = 2.8 x 10^-11 M
pOH = - log [OH^1-]
pOH = - log [2.8 x 10^-11 ]
pOH = 10.55
pH = 14-10.55
pH = 3.45

_______________________________________

[OH-] = 6.7 x 10-10 M

[OH-] = 6.7 x 10^-10 M
pOH = - log [OH^1-]
pOH = - log [6.7 x 10^-10]
pOH = 9.17
pH = 14-9.17
pH = 4.83

_______________________________________

[OH-] = 1.0 x 10-5 M

[OH-] = 1.0 x 10-5 M
pOH = - log [OH^1-]
pOH = - log [1.0 x 10^-5 ]
pOH = 5
pH = 14-5
pH = 9

_______________________________________

we know that , the solution with <u>pH > 7</u> is termed as basic and more the pH ,more the basicity, hence ,the solution with the highest pH would be the strongest base out of these all which is

<u>[OH-] = 1.0 x 10-5 M</u> with pH = 9

_______________________________________

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2 years ago

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Who invented the periodic table

Goryan [66]

Dmitri Mendeleev invented the periodic table.

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3 years ago

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