Which element has the lowest electronegativity? Calcium(Ca) Gallium(Ga) Selenium(Se) Bromine(Br)

Answer:

A solution

Explanation:

Mainly because a solution is a mixture of chemically bonded elements.

Soccer ball will have greater acceleration. Therefore, the correct option is option B among all the given options.

What is acceleration?

Acceleration: the rate at which the speed and direction of a moving object vary over time. A point or object going straight forward is accelerated when it accelerates or decelerates. Even though the speed is constant, motion on a circle accelerates because the direction is always shifting. These tangential to the acceleration for all other motions.

Acceleration is a vector field since it has both a direction and a magnitude. A vector quantity is also velocity. The velocity vector change during a time interval multiplied by the interval of time is the definition of acceleration. Soccer ball will have greater acceleration.

Therefore, the correct option is option B.

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Answer:

soccer ball ⚽️

Explanation:

Answer:

3 : 1

Explanation:

Let the rate of He be R1

Molar Mass of He (M1) = 4g/mol

Let the rate of O2 be R2

Molar Mass of O2 (M2) = 32g/mol

Recall:

R1/R2 = √(M2/M1)

R1/R2 = √(32/4)

R1/R2 = √8

R1/R2 = 3

The ratio of rate of effusion of Helium to oxygen is 3 : 1

Answer:

a. True

Explanation:

The atomic radius is taken as the half of the inter nuclear distance between two atoms that are covalently bonded.

Across a period, the atomic radii usually decrease progressively because the nuclear charge(number of protons in the nucleus) increases without the increase in the number of electronic shell. Therefore, the electrons are pulled more to the nucleus.

Down a group, the effect of the nuclear pull is reduced because the number of electron shell increases and the nuclear charge is being compensated for.

Final answer:

The early 19th century work of John Dalton, particularly his advancement of atomic theory and the concepts of specific mass ratios in chemical reactions, is considered one of the first major series of events in the study of chemistry. Amedeo Avogadro further developed these ideas by defining Avogadro's number.

Explanation:

The origin of chemistry can be traced back to the practice of alchemy, with attempts to understand the behavior of matter dating back more than 2500 years. However, one of the first series of significant events in the

study of chemistry began in the early 19th century with John Dalton's work in atomic theory, which was based on quantitative measurements and helped establish the concept of atoms and molecules as fundamental units of substances. Dalton was also instrumental in establishing the concept of specific mass ratios in chemical reactions, which led to the development of formula mass - the sum of the average atomic masses of all atoms in a substance's formula. This work was later extended by the Italian physicist

Amedeo Avogadro, who developed the concept of a fixed number of atoms or molecules in a mole, known today as Avogadro's number.

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