All categories

3 years ago

Lavoisier made an important contribution to chemistry by _____.

Chemistry

1 answer:

Harlamova29_29 [7]3 years ago

6 0

Answer:

Lavoisier made an important contribution to chemistry by the law of conservation of mass

Explanation:

The law of conservation of mass tell us, that the mass doens't change in a system. You have the same mass at the begining and in the end of a reaction.

Matter is neither created, nor destroyed in a chemical reaction.

This law also states that mass of reactants is the same of products in any chemical reaction

You might be interested in

Calculate the value of E°cell for the following reaction:2Au(s) + 3Ca2+(aq) → 2Au3+(aq) + 3Ca(s)Au3+(aq) + 3e- → Au(s) E° = 1.50

uranmaximum [27]

Answer: The standard electrode potential of the cell is -4.37 V

Explanation:

For the given cell reaction:

$2Au(s)+3Ca^{2+}(aq.)\rightarrow 2Au^{3+}(aq.)+3Ca(s)$

The half reactions follows:

Oxidation half reaction: $Au(s)\rightarrow Au^{3+}(aq.)+3e^-;E^o_{Au^{3+}/Au}=1.50V$ ( × 2 )

Reduction half reaction: $Ca^{2+}(aq.)+2e^-\rightarrow Ca(s);E^o_{Ca^{2+}/Ca}=-2.87V$ ( × 3 )

Substance getting oxidized always act as anode and the one getting reduced always act as cathode.

To calculate the $E^o_{cell}$ of the reaction, we use the equation:

$E^o_{cell}=E^o_{cathode}-E^o_{anode}$

Putting values in above equation, we get:

$E^o_{cell}=-2.87-(1.50)=-4.37V$

Hence, the standard electrode potential of the cell is -4.37 V

8 0

3 years ago

How is the climate in San Francisco, California different from Wichita, Kansas

natulia [17]

One is closer to the equator so be must be warmer

7 0

3 years ago

Which of these is an example of a physical change?

alexdok [17]

Sugar dissolved in water

8 0

3 years ago

What is the balanced molecular equation for the reaction between nitric acid and calcium hydroxide?

hodyreva [135]

Nitric acid is HNO3 while Calcium Hydroxide is a base with a chemical formula Ca(OH)2. When acid reacts with base, it forms salt and water (H20). Hence forming the equation HNO3 + Ca(OH)2 -> Ca(NO3)2 + H20.
To gain the same number of atoms on both sides, the balanced molecular equation should be:

2NO3 + Ca(OH)2 -> Ca(NO3)2 + 2H2O

with: 4 Hydrogen, 2 Nitrogen, 8 Oxygen, and 1 Calcium

5 0

3 years ago

Someone please answer the question attached.

nikdorinn [45]

Answer:

Option ( 1 )

Explanation:

This atom has a cub close pack structure, and therefore - the number of edge center present in X atoms = 4,

Number of unit cells present in X atoms = 6

____________________________________________________

Now the 6th coordination number of X atom = 6 * 4 = 24,

So respectively, the 3rd coordination number of X = 8 -

And thus the ratio between the 6th coordination number and the 3rd coordination number = 24 / 8 = 3,

Option ( 1 )

Hope that helps!

5 0

3 years ago