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3 years ago

Which particle is J.J Thomson credited with discovering

1 answer:

6 0

Thomson in 1897 was the first to suggest that one of the fundamental units was more than 1,000 times smaller than an atom, suggesting the subatomic particle now known as the electron. Thomson discovered this through his explorations on the properties of cathode rays.

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What reaction type is the followong reaction

Tems11 [23]

Answer:

its the fourth one please mark as brainlest

Explanation:

8 0

3 years ago

Give the formula for the compound formed when sulfur trioxide reacts with water.

Lera25 [3.4K]

Sulphur trioxide reacts with water to form a solution of sulphuric acid.
The equation describing this reaction is:
SO3 + H2O .............> H2SO4

Based on the above equation, the formula of the compound formed when sulphur trioxide reacts with water is: H2SO4

6 0

3 years ago

A chemistry student needs 45.0mL of pentane for an experiment. By consulting the CRC Handbook of Chemistry and Physics, the stud

Masja [62]

The mass of pentane the student should weigh out is

The density of pentane is 0.626 gcm-3

To calculate the mass of pentane following expression is used,

(Density is defined as the mass divide by volume)

Density = mass / volume

mass of pentane = Density of pentane * Volume of pentane

mass of pentane = 0.626 gcm-3 * 45.0 mL

= 28.17 g

Here the unit of mass of pentane is g,

However the unit of density is gcm-3 and unit of volume is mL i.e. cm3

Hence, Mass = gcm-3 * cm3

Mass = g

The mass of pentane the student should weigh out is 28.17g

Learn more about Density on

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5 0

2 years ago

Which pair of elements has the most similar Lewis structures?

jonny [76]

Answer: C.)

Explanation:

8 0

2 years ago

Read the lab procedure for a controlled experiment that looks at the effect of heat on the circumference of bicycle tires.

gavmur [86]

The last step (step 5) in the experiment is to write a conclusion for the experiment. (Option B).

<h3>What is an experiment?</h3>

The essence of an experiment is to be able to establish a cause and effect relationship. It is only when we carry out a carefully controlled experiment that we can say that x causes y because the data would support our findings.

After, we have carried out an experiment, the next step is to put the evidences together and then try to arrive at a logical conclusion for the experimental procedure.

Thus the last step (step 5) in the experiment is to write a conclusion for the experiment. (Option B).

Learn more about experiment:brainly.com/question/11256472

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5 0

2 years ago