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e-lub [12.9K]
2 years ago
6

Henri Becquerel and the Curies are famous for discovering that the atom is not indivisible, a belief held since the time of the

Greek philosophers.
True
False
Chemistry
2 answers:
Sphinxa [80]2 years ago
7 0

Answer:

The statement "Henri Becquerel and the Curies are famous for discovering that the atom is not indivisible, a belief held since the time of the Greek philosophers." is <u>true</u>.

Explanation:

Henri Becquerel, Pierre and Marie Curie were three French physicists that in the year 1903 received the Nobel Prize of Physics due to their research and discoveries regarding radioactivity. Becquerel was the first person to discovered, in the year 1896 that atoms were neither indivisible nor mutable, discovery that challenged the previously constituted ideas on atomic structure. Pierre and Marie Curie were the first two people in working with radioactivity and discovering the atomic elements radium and polonium during a research in 1898. All of these physicists worked around the same time with radioactivity and researching the atomic theory, giving new perspectives to the subject.

Rainbow [258]2 years ago
3 0
Henri Becquerel discovered radioactivity and it was the Curies who made experiments about the concept and became known for their d
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Will mark branliest. Calculating percent yield: For the reaction Cu + 2AgNO3 → Cu(NO3)2 + 2 Ag, adding 127 grams of copper to lo
pishuonlain [190]

Percent yield = (Actual Yield/ Theoretical Yield) x 100

Given, Actual Yield of silver = 410 grams

Given, mass of copper = 127 g

Atomic mass of copper = 63.546 amu

Formula: Moles = mass / atomic mass

Moles of copper = 127 g/ 63.546 amu = 1.998 mol

Based on the given balanced chemical reaction, the molar ratio between Cu: Ag is 1:2

So 1.998 mol of copper should yield (2 mol Ag/ 1 mol Cu) x 1.998 mol of Cu = 3.996 mol

Calculated mol of Ag = 3.996 mol

Atomic mass of silver = 107.8682 amu

Mass of silver = moles x atomic mass = 3.996 mol x 107.8682 amu = 431 g

Based on the math, the theoretical yield = 431 g

Percent yield of silver = (410g/431g) x 100 = 95. 13%

The answer is 95. 13%

8 0
3 years ago
Each type of mineral has a chemical composition that is what
denis23 [38]

Each type of mineral has a chemical composition that is unique such as its chemical composition and the arrangement of atoms. For example, the mineral hematite is Fe2O3. There are two atoms of iron (Fe) and three atoms of oxygen (O).

8 0
3 years ago
Scientific experiments showed evidence that the mass of an atom was greater than the total mass of its protons. these experiment
Leviafan [203]
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I hope this answer helped you!
5 0
2 years ago
What pressure of carbon dioxide is required to
natta225 [31]
The solubility of a gas (Sgas) is directly proportional to its partial pressure (Pgas). what pressure of carbon-dioxide is required to keep the carbon dioxide concentration in a bottle of club soda at 0.12 M at 25 degrees Celsius ? 0.12 M = 3.4 x 10^-2 (Pgas?)
8 0
3 years ago
You are given 25.00 mL of an acetic acid solution of unknown concentration. You find it requires 35.75 mL of a 0.2750 M NaOH sol
oksano4ka [1.4K]

Answer:

a. 0.393M CH₃COOH.

b. 2.360% of acetic acid in the solution

Explanation:

The reaction of acetic acid (CH₃COOH) with NaOH is:

CH₃COOH + NaOH → CH₃COO⁻ + H₂O + Na⁺

<em>That means 1 mole of acid reacts per mole of NaOH.</em>

Moles of NaOH to reach the equivalence point are:

35.75mL = 0.03575L × (0.2750mol / L) = <em>9.831x10⁻³ moles of NaOH</em>

As 1 mole of acid reacts per mole of NaOH, moles of CH₃COOH in the acid solution are 9.831x10⁻³ moles.

a. As the volume of the acetic acid solution is 25.00mL = 0.02500L, the molarity of the solution is:

9.831x10⁻³ moles / 0.02500L =

<h3>0.393M CH₃COOH</h3>

b. Molar mass of acetic acid is 60g/mol. The mass of 9.831x10⁻³ moles is:

9.831x10⁻³ moles ₓ (60g / mol) = <em>0.590g of CH₃COOH</em>.

As volume of the solution is 25.00mL, the percentage of acetic acid is:

(0.590g CH₃COOH / 25.00mL) ₓ 100 =

<h3>2.360% of acetic acid in the solution</h3>

8 0
2 years ago
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