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3 years ago

HELP! THIS IS SCIENCE

2 answers:

7 0

This is known as Rutherford's gold foil experiment. To align with J.J Thompson's Plum Pudding Model, he expects a beam of alpha particles to just pass through the gold foil undisturbed. However, some were deflected at certain angles. Alpha particles are positive, so it would just go straight through the nucleus, but will deflect if it hits the electrons. Therefore, the answer is: Particles that struck the nucleus went straight.

juin [17]3 years ago

3 0

Answer is: Electron cloud allowed the particles to pass through.

Rutherford theorized that atoms have their charge concentrated in a very small nucleus.

This was famous Rutherford's Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles (helium atom particles, consist of two protons and two neutrons).

Rutherford observed the deflection of alpha particles on the photographic film and notice that most of alpha particles passed straight through foil.

That is different from Plum Pudding model, because it shows that most of the atom is empty space.

According to Rutherford model of the atom:

1) Atoms have their charge concentrated in a very small nucleus.

2) Major space in an atom is empty.

3) Atoms nucleus is surrounded by negatively charged particles called electrons.

4) An atom is electrically neutral.

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Which of the following substances has increased markedly due to the use of fossil fuels and contributes to the greenhouse effect

Alenkasestr [34]

Answer:

The correct option is: CO₂

Explanation:

Greenhouse effect refers to the natural phenomenon by which the Sun's radiation increases the temperature of the Earth's surface.

The incoming Sun's radiation is radiated by the greenhouse gases present in the Earth's atmosphere. A fraction of the radiated energy is then absorbed by the Earth's surface, thus resulting in increase in the temperature.

Thus the green house effect depends upon the amount of green house gases present in the atmosphere.

The green house gases are the radiatively active gases. The main four green house gases are: water vapor (H₂O(g)), carbon dioxide (CO₂), methane (CH₄) and ozone (O₃).

Human activities such as burning of fossil gases and deforestation increases the concentration of CO₂ significantly. Thereby contributing to the greenhouse effect.

7 0

2 years ago

Which is the safest method for diluting concentrated sulfuric acid with water?

Anton [14]

The safest method for diluting concentrated sulfuric acid with water is to add acid to water. This way, when spill occurs, the acid is already diluted and less harmful than adding water to acid.

3 0

2 years ago

The valence electrons of a krypton (Kr) atom in the ground state are located in the

egoroff_w [7]

Answer:

Explanation:

The valence electrons are the outer electrons and must be located in the outermost shell. In this case, D.

6 0

2 years ago

How many neutrons are in the element phosphorus?

Art [367]

Finding neutrons = Mass number - proton number.
For finding neutrons for phosphorus = 31-15
=16.

7 0

2 years ago

Gerald's science teacher mixed room temperature samples of hydrochloric acid and sodium hydroxide in a large beaker. The solutio

shutvik [7]

Answer: Option (D) is the correct answer.

Explanation:

The chemical reaction equation will be as follows.

$HCl + NaOH \rightarrow NaCl + H_{2}O$

This means a new substance has been formed and a chemical change has taken place.

A chemical reaction in which heat energy is absorbed by the reactant molecules is known as an endothermic reaction.

For example, $A + B + Heat \rightarrow AB$

On the other hand, a chemical reaction in which heat energy is released by the reactant molecules is known as an exothermic reaction.

For example, $C + D \rightarrow CD + Heat$ is an exothermic reaction.

Thus, we can conclude that in the given situation the beaker most likely felt warm because a chemical reaction was producing a new substance.

8 0

2 years ago