All categories

3 years ago

What does the law of conservation of mass say?

Chemistry

1 answer:

yaroslaw [1]3 years ago

3 0

Answer:

A) the mass of product in a chemical reaction is equal to the mass of the reactant.

Explanation:

Law of conservation of mass:

According to the law of conservation mass, mass can neither be created nor destroyed in a chemical equation.

Explanation:

This law was given by french chemist Antoine Lavoisier in 1789. According to this law mass of reactant and mass of product must be equal, because masses are not created or destroyed in a chemical reaction.

For example:

In given photosynthesis reaction:

6CO₂ + 6H₂O + energy → C₆H₁₂O₆ + 6O₂

there are six carbon atoms, eighteen oxygen atoms and twelve hydrogen atoms on the both side of equation so this reaction followed the law of conservation of mass.

You might be interested in

Help please thank you!!!

omeli [17]

Answer:

I think its J

Explanation:

sorry if im wrong

7 0

2 years ago

Read 2 more answers

20 POINTS!!! PLS HELP ME

Gala2k [10]

Answer:

they just add heat, then it turns to water vapor

Explanation:

The first h20 is water the arrow represents adding heat, and the second h20 represent water vapor (water as a gas)

5 0

3 years ago

Read 2 more answers

n‑methyl‑2‑pyrrolidone is an aprotic solvent used in many industrial processes. draw the structure of the product formed when it

kotegsom [21]

The structure of n‑methyl‑2‑pyrrolidone when it is heated with aqueous acid. product is given below

<h3 /><h3>What is aprotic solvent?</h3>

A polar solvent without an acidic proton is known as a polar aprotic solvent. These solvents don't include hydroxyl or amine groups. These solvents can act as proton acceptors, but unlike protic solvents, they do not act as proton donors in hydrogen bonding.

After being exposed to a strong aqueous acidic media and being heated, N-methyl-2-pyrrolidone opens up, forming a molecule with a carboxylic group at one end and a protonated nitrogen atom with a methyl group connected to it at the other.

Alcohol, water, hydrogen fluoride, formic acid, acetic acid, ammonia, methanol, ethanol, and other well-known substances are a few examples of polar protic solvents. Polar aprotic solvents, on the other hand, lack acidic protons and do not function as donors during hydrogen bonding.

to learn more about aprotic solvent go to -

brainly.com/question/20595633

#SPJ4

7 0

1 year ago

_______ cause(s) empty space to expand and gravitational pull to weaken

igomit [66]

The answer is Dark Energy. It counters gravitational pull and causes empty space to expand at an accelerated rate.

4 0

3 years ago

How long does it take electrons to get from the car battery to the starting motor? Assume the current is 137 A and the electrons

WARRIOR [948]

Answer:

t = 55.79 min

Explanation:

First, the problem is asking for calculate the time that it takes electrons from the battery to the motor.

The general formula to calculate time is:

t = d/V (1)

Where:

d: distance or length

V: speed

Now, we don't have data of speed, but we can know an expression of current density in function of the distance which is the following:

J = n*q*V (2)

Where:

q: charge of the particle (1.6x10^-19 C)

n: number of charge carriers per unit of volume

Current density (J) is actually current per Area so:

J = I/A (3)

Replacing (3) in (2) we have:

I/A = nqV

Solving for V:

V = I/Anq (4)

Finally, if we replace this expression in (1) we have:

t = nqAd / I (5)

Now, the value of n, it's not given but it can be calculated because we have mass density, molar mass and avogadro's number, so this value of "n" can be calculated using the following expression:

n = D * Av / MM (6)

Where:

D: mass density (kg/m³)

Av: avogadro number (6.02x10^23 atom/mol)

MM: molar mass (kg/mol)

Putting the data that we know to calculate n we have:

n = 8960 * 6.02x10^23 / 0.0635

n = 8.49x10^28 atom/m³

Now with the value of n, we can finally calculate the time:

t = nqAd / I

A is the area and it should be in m²: 44.6 mm² / 1x10^6 m = 4.46x10^-5 m²

d is the length in meter: 75.7 cm / 100 cm/m = 0.757 m

so replacing these data in (5):

t = 8.49x10^28 * 1.6x10^-19 * 4.46x10^-5 * 0.757 / 137

t = 3,347.63 s

But the answer is in minute so:

t = 3,347.63 / 60

t = 55.79 min

so the electrons takes 56 min aprox. to go from the car battery to the starting motor.

4 0

3 years ago