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3 years ago

Explain the importance of measurement in our daily life

1 answer:

8 0

Measurements play an important role in our daily lives because they are helpful to complete our daily tasks without difficulty. Things such as measuring medicine, making time estimations, and find weights, areas and volumes of different materials or substances, are all simpler with measurements.

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Which of the following cannot be separated by physical means?

Elina [12.6K]

The correct answer is D Elements

8 0

3 years ago

True or false adding a solute to a solvent will raise the freezing point of the solvent.

sergejj [24]

It would be false adding a solute to a solvent

8 0

3 years ago

what quantity of ethylen glycol must be added to 125 g of water to raise the boiling point of 1.0 degrees celsuis

labwork [276]

Answer:

We should add 15.15 grams of ethylen glycol.

Explanation:

Step 1: Data given

Mass of water = 125 grams

Temperature change = 1.0 °C

The boiling point elevation constant, Kbp, for water is 0.5121 °C/m

Step 2: Calculate mass needed

ΔT = i* Kb * m

⇒ with i = the van't Hoff factor = 1

⇒ with Kb = 0.5121 °c/ kg/mol

⇒ with m = molality = moles / mass

ΔT = i* Kb * m ⇒ 1°C = 0.5121 °C / kg/mol * (X/0.125kg)

X = 0.2441 moles

Step 3: Calculate mass of ethylen glycol

Mass ethylen glycol = moles * molar mass

Mass ethylen glycol = 0.2441 moles * 62.068 g/mol

Mass of ethylen glycol = 15.15 grams

We should add 15.15 grams of ethylen glycol.

4 0

3 years ago

A block of concrete has a mass of 5100 g and a volume of 2500 cm3 . Calculate the density.

uysha [10]

Answer:

2.04 g/cm3

Explanation:

Density = mass ÷ volume

= 5100 ÷ 2500

=2.04 g/cm3

4 0

3 years ago

The combustion of ethane (C2H6)(C2H6) produces carbon dioxide and steam. 2C2H6(g)+7O2(g)⟶4CO2(g)+6H2O(g) 2C2H6(g)+7O2(g)⟶4CO2(g)

Vera_Pavlovna [14]

Answer:

11.9 moles of carbon-dioxide will produced.

Explanation:

Given moles of ethane = 5.95 mol

$2C_2H_6(g)+7O_2(g)\rightarrow 4CO_2(g)+6H_2O(g)$

According to reaction 2 moles of ethane produces 4 moles of carbon-dioxide.

Then, 5.95 moles of ethane will produce:

$\frac{4}{2}\times 5.95 mol=11.9 mol$ of carbon-dioxide

11.9 moles of carbon-dioxide will produced.

8 0

3 years ago

Explain the importance of measurement in our daily life​

Explain the importance of measurement in our daily life