How does activation energy affect the progress of a reaction?
O A. The reaction will not occur unless the activation energy is met.
B. The activation energy decreases the energy needed for a reaction
to progress.
C. The activation energy increases how quickly the reaction will
progress.
D. The activation energy determines equilibrium concentrations of
products.

Answer:

1. The Nummber of electrons present in the outermost shell is called Valence electrons.

2. Thomson model:

Thomson model of atom is the model which states that electrons are embedded in a positively charged solid material which is spherical in shape.

Rutherford model

Rutherford model of atom is the model which explains that there is a nucleus in the center of the atom and electrons are located around the nucleus.

3. Relative atomic mass. Atoms have very little mass , so they're difficult to measure accurately. Instead, chemists use a scale. On this scale the mass of a 12C atom is exactly 12.

4. Difference between Alpha, Beta and Gamma radioactive decay:

Alpha decay forms new element with two fewer protons and two fewer neutrons;

Beta decay forms new element with one more proton and one fewer neutron.

Gamma decay forms NO new element, but now the element has less energy because energy is released as gamma rays.

Gamma radiation has the highest penetration power, Beta decay goes the second, alpha decay the last. However, alpha particles make the most damage even if it has the lowest penetration power among the three.

5. This species has a 2− charge on it, so it is an anion. Anions are named using the stem of the element name with the suffix -ide added. This is the oxide anion.

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Answer:

A. Energy  must be conserved in a nuclear reaction

Explanation:

Answer:

Explanation:

In a nuclear reaction, which of the following must be conserved?

A. Energy

Answer:

C.

Fe goes from 0 to 2+, oxidation. It is reducing agent

N goes from 5+ to 2+, reduction. It is oxidizing agent

Explanation:

Oxidation number

Fe (s) has 0

FeSO4 has 2+

HNO3 N has 5+

NO N has 2+

ANSWER

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Explanation:

Answer:

The larger the species, the further away from the nucleus the outer electrons are and hence the less strongly they are held. This means the bigger atoms will be more polarizable. So, the order from biggest-smallest molecules (strongest to weakest IMF) is iodine, bromine and finally chlorine.

Explanation:

Answer:

The specific heat capacity is 0.67 [tex]\frac{J}{g*C}[/tex]

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

The amount of heat that a body receives or transmits is determined by the following expression:

Q = c * m * ΔT

Where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.

This expression indicates that between heat and temperature there is a direct proportional relationship.

In this case:

Replacing:

100 J= c*5 g* 30°C

Solving:

[tex]c=\frac{100 J}{5 g* 30C}[/tex]

c= 0.67 [tex]\frac{J}{g*C}[/tex]

The specific heat capacity is 0.67 [tex]\frac{J}{g*C}[/tex]