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3 years ago

WILL GIVE BRAINLIEST!

Chemistry

2 answers:

Vera_Pavlovna [14]3 years ago

8 0

Answer:

The Celsius temperature scale based on the boiling and freezing points of water

Explanation:

Temperature is defined as degree of coldness or hotness of a body or substance. And degree Celsius is one of the units in which it is measured.

A Celsius temperature scale s used to measure temperature in Celsius in which zero degree indicates freezing point of water and hundred degree Celsius indicates boiling point of water.

0° C = Temperature at which water freezes

100° C = Temperature at which water boils

ahrayia [7]3 years ago

3 0

$\huge{\boxed{\text{The boiling and freezing points of water}}}$

The Celsius temperature scale is based on the boiling and freezing points of water.

The boiling point of water is 100 degrees Celsius.

The freezing point of water is 0 degrees Celsius.

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What is the SI unit of pressure and from what units is it derived

irga5000 [103]

The Pascal (symbol: Pa) is the SI derived unit of pressure. It is used to quantify internal pressure, stress, Young's modulus and ultimate tensile strength. It is defined as one Newton per square meter. It is named after the French polymath Blaise Pascal.

The Pascal (Pa) or kilo pascal (kPa) as a unit of pressure measurement is widely used throughout the world and has largely replaced the pounds per square inch.

5 0

4 years ago

A substance has a mass of 50 g and a density of 2.5 g/mL. What is its volume?

Marina CMI [18]

Answer:

125

Explanation:

8 0

3 years ago

Very easy significant figures question!

Anon25 [30]

As you said, the answer is 150.

But in all the numbers, there's a comma with two zeros, and so you have to put them in your answer : 150,00

They are the significative numbers.

Hope it helps

4 0

3 years ago

In the mass spectrum of the molecule phenol, C6H5OH, the approximate intensity of the peak at m/z 95, relative to the molecular

klasskru [66]

The correct answer to thi

6 0

4 years ago

Milk of magnesia is often taken to reduce the discomfort associated with acid stomach or heartburn. The recommended dose is 1 te

Igoryamba

Answer:

8.61 mL of the HCl solution

Explanation:

The reaction that takes place is:

2HCl + Mg(OH)₂ → MgCl₂ + 2H₂O

From the given mass of Mg(OH)₂, we can calculate <u>the moles of HCl that are neutralized</u>:

4x10² mg = 400 mg = 0.400g

0.400g Mg(OH)₂ ÷ 58.32g/1mol = 6.859*10⁻³ mol Mg(OH)₂

6.859*10⁻³ mol Mg(OH)₂ * $\frac{1molHCl}{1molMg(OH)_{2}} =$ 3.429x10⁻³ mol HCl

Finally, to calculate the volume of an HCl solution, we need both the moles and the concentration. We can <u>calculate the concentration using the pH value</u>:

pH = -log[H⁺]

1.4 = -log[H⁺]

$10^{-1.4}$ = [H⁺]

0.0398 M = [H⁺] = [HCl] *Because HCl is a strong acid*

Thus, the volume is:

0.0398 M = 3.429x10⁻³mol HCl / Volume

Volume = 8.616x10⁻³ L = 8.62 mL

6 0

4 years ago

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