3 years ago

Which of the following cannot be tested by science?

Chemistry

2 answers:

kifflom [539]3 years ago

7 0

How emotions affects the quality of paints

Digiron [165]3 years ago

4 0

B. how emotions affects the quality of a painting

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Calculate the density of the aluminum cylinder with a diameter 0f 1.3 cm weighing 18 grams. Height of the cylinder is 5.2 Cm. Fi

Masja [62]

Answer:

Percent error = 3.7%

Explanation:

Given data:

Density of Al cylinder = ?

Weight of cylinder = 18 g

Diameter = 1.3 cm

Height = 5.2 cm

Actual density of Al = 2.7 g/cm³

Percent error = ?

Solution:

First of all we will calculate the volume of cylinder through given formula.

V = πr²h

r = diameter /2

V = 22/7 × (0.65 cm)²× 5.2 cm

V = 22/7 × 0.4225cm²× 5.2 cm

V = 6.89 cm³

Now we will calculate the density.

d = m/v

d = 18 g/ 6.89 cm³

d = 2.6 g/cm³

Percent error:

Percent error = measured value - actual value /actual value × 100

Percent error = 2.6g/cm³ - 2.7g/cm³ /2.7g/cm³ × 100

Percent error = 3.7%

Negative sign shows that measured or experimental value is less than actual value.

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3 years ago

What do a mole of magnesium and a mole of iron have in common

Vanyuwa [196]

The mole of anything has the same amount of particles and it is equal
$6.02* 10^{23}$ .

So a mole of magnesium and a mole of iron have the same number of atoms and it is equal
6.02*10²³

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3 years ago

Design a synthesis of 2-ethoxy-2-methylpropane from 2-methylpropene.

Usimov [2.4K]

In the presence of Hg (OAc)2, the alkenes reacts with alcohol to give allkoxy-mercurated product followed by reduction with NaBH4 to give ether. This reaction is known as alkoxymercuration-demercuration reaction.