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DIA [1.3K]
3 years ago
12

Which contribution added to rutherfords discovery of a positive nucleus atoms are invisible electrons are scattered in an atom n

eutrons are inside the nucleus of An atom atoms of the same element have the same properties
Chemistry
1 answer:
dedylja [7]3 years ago
5 0

Answer:

neutrons are inside the nucleus

Explanation:

The most significant contribution that added to Rutherford's discovery of a positive nucleus is that neutrons are also inside the nucleus.

  • The discovery of neutrons as a nuclear particle was instrumental to Rutherford's discovery.
  • Since during his experiment, the alpha particles were deflected partly, he suggested a massive nucleus made up of just protons.
  • With the discovery of the neutron, the mass of the nucleus was enough to cause the deflection.
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A second-order reaction has a rate constant of 1.25 M-1 s-1. If the initial reactant concentration is 1.0 M (a) determine the ha
Ne4ueva [31]

Answer:

(a) 0.8 s

(b) t = 7.2 s

Explanation:

(a) Half life expression for second order kinetic is:

t_{1/2}=\frac{1}{k[A_o]}

Where,

[A_o] is the initial concentration = 1.0 M

k is the rate constant = 1.25 M⁻¹s⁻¹

So,

t_{1/2}=\frac{1}{1.25\times 1.0}

Half life = 0.8 s

(b) Integrated rate law for second order kinetic is:

\frac{1}{[A_t]} = \frac{1}{[A]_0}+kt

Where, [A_t] is the final initial concentration

For 90% completion, 10% is left. so,

[A_t]=\frac {10}{100}\times 1.0=0.1\ M

So,

\frac{1}{0.1} = \frac{1}{1.0}+1.25t

t = 7.2 s

8 0
3 years ago
What is the Molar Mass of methylammonium bromide: Use the Periodic Table and round to the nearest hundredths.
egoroff_w [7]

The molar mass of methylammonium bromide is 111u.

<h3>What is molar mass?</h3>

The molar mass is defined as the mass per unit amount of substance of a given chemical entity.

Multiply the atomic weight (from the periodic table) of each element by the number of atoms of that element present in the compound.

Add it all together and put units of grams/mole after the number.

Atomic weight of H is 1u

Atomic weight of N is  14u

Atomic weight of C is  12u

Atomic weight of Br is  79u

Calculating molar mass of  2H_3NCH_3Br =2(1 x3+ 14+12+ 1 x 3 +79) = 111u

Hence, the molar mass of methylammonium bromide is 111u.

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8 0
2 years ago
A sample of metal has a mass of 5. 2 g and absorbs 20. 0 j of energy as it is heated from 30. 0°c to 40. 0°c. What is the identi
kiruha [24]

The identity of the metal is copper.

<h3>What is specific heat?</h3>

The amount of energy needed to raise the temperature of one gram of a substance by one degree Celsius.

Using the formula of specific heat

H = mcdT

Where, H = Heat absorbed

m = mass of the metal

c = specific heat capacity of the metal

dT = temperature change

Putting the values in the equation

20 J = 0.0052 Kg × c × ( 40.0°C - 30.0°C)

c = 20 J/0.0052 Kg × ( 40.0°C - 30.0°C)

c = 385 JKg-1°C-1

Thus, the metal is copper.

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6 0
2 years ago
In which situation are unbalanced forces acting on an object?(1 point)
Alex Ar [27]

Answer:

1. Two people stand on the same side of a large tire. Both people pull the tire with equal force.

2. an object’s ability to not change its motion

3. The car moves forward, while inertia keeps the balloon in place.

4. The unbalanced forces of air resistance and gravity slow the airplane and pull it down.

5. The force acting on the object must be unbalanced.

7 0
3 years ago
Why does a metal bond with a non-metal in ionic bondings?? ASAP please
crimeas [40]

An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions. Ionic bonds are formed between a cation, which is usually a metal, and an anion, which is usually a nonmetal. A covalent bond involves a pair of electrons being shared between atoms.

4 0
3 years ago
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