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IceJOKER [234]
3 years ago
8

Describe how the Rube Goldberg device design that you created follows the law of conservation of energy. Be sure to include both

parts of the law of conservation of energy in your description.

Chemistry
2 answers:
dedylja [7]3 years ago
7 0
Rube Goldberg machines follows law of conservation of energy. In this machine when marble rolls down from top it has kinetic energy.
krek1111 [17]3 years ago
5 0
In this machine, a various instant kinetic energy is transferred into potential energy and vice-versa , so the total energy remain conserved. Thus Rube Goldberg machines follows law of conservation of energy. In this machine when marble rolls down from top it has kinetic energy.
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37.5ml of menthol is dissolved in water to make 456 ml of solution, what is the concentration expressed in volume/volume % of th
Ahat [919]

Answer:

V/V% = 8.2%

Explanation:

Given data:

Volume of methanol = 37.5 mL

Volume of solution = 456 mL

V/V% = ?

Solution:

V/V% = [volume of solute / volume of solution ]×100

V/V% = 37.5 mL / 456 mL × 100

V/V% = 0.08× 100

V/V% = 8.2%

3 0
3 years ago
A solution is made by dissolving 3.14 g of NaCl in 79.9 mL of water. What is the concentration of sodium chloride in units of we
Trava [24]

The concentration of sodium chloride in units of weight/volume percent is 3.93g/ml

Given that

3.93 (w/v) NaCl

Weight NaCl = 3.14g

Volume of water = 79.9mL

W/V is usually represented in g/mL, so no need to change anything

3.14g/79.9mL *100 = 3.93 g/mL (%)

One mole of NaCl contains 6.022 x 10 23 NaCl formula units.

• Use the mole quantity to count formulas by weighing them.

• Mass of a mole of particles = mass of 1 particle x 6.022 x 1023

• The mass of an atom in amu is numerically the same

as the mass of one mole of atoms of the element in grams.

• One atom of sulfur has a mass of 32.07 amu;

one mole of S atoms has a mass of 32.07 g.

Mass of 1 H atom: 1.008 amu x 1.661 x10-24 g/amu = 1.674 x10-24 g

Mass of 1 mole of H atoms:

1.674 x10-24g/H atom x 6.022 x1023H atoms = 1.008 g

Learn more about Weight / volume Percentage here

brainly.com/question/14296094

#SPJ4

6 0
1 year ago
Water is unusual because it expands as it freezes, Very few substances have this property. The reason liquid water is more dense
Ymorist [56]

Answer:

When liquid water is cooled, it contracts until a temperature of approximately 4 degrees Celsius is reached. After that, it expands slightly until it reaches the freezing point, and then when it freezes it expands by approximately 9%. When water freezes, water molecules form a crystalline structure maintained by hydrogen bonding. Ice is less dense than water because the orientation of hydrogen bonds causes molecules to push farther apart, which lowers the density.

4 0
3 years ago
Read 2 more answers
Methane burns in oxygen to produce carbon dioxide and water. Which of the tollowing represents a preliminary, unbalanced equatio
WITCHER [35]

So first we need to know what the formulas are:

Methane: CH_{4}

Oxygen: O_{2}

Carbon Dioxide: CO_{2}

Water: H_{2}O

So then we follow the equation as specified in the question. Note that it does not need to be balanced, as the question states it wants the unbalanced equation:

CH_{4}+O_{2} → CO_{2}+H_{2}O

This is the preliminary, unbalanced equation with the correct chemical formulas.

4 0
3 years ago
A reaction has initial concentration of 0.230 m fe3+ and 0.410 m scn- at equilibrium, the concentration of fescn2+ is 0.150 m.
allsm [11]

Answer :

a) The concentration of Fe^{3+} at equilibrium is 0.08 m.

b) The concentration of SCN^{-} at equilibrium is 0.26 m.

Solution :

The equilibrium reaction is,

                                            Fe^{3+}+SCN^-\rightleftharpoons [FeSCN]^{2+}

Initial concentration          0.230         0.410          0

At equilibrium              (0.230 - x)    (0.410 - x)       x

                               

Given x = 0.150

Therefore,

The concentration of Fe^{3+} = 0.230 - x = 0.230 - 0.150 = 0.08

The concentration of SCN^{-} = 0.410 - x = 0.410 - 0.150 = 0.26

Thus, the concentration of Fe^{3+} at equilibrium is 0.08 m.

The concentration of SCN^{-} at equilibrium is 0.26 m.

6 0
3 years ago
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