A baseball player hits a ball. Which is the best description of the energy of the ball as it flies over the pitcher’s head?
Answers
Answser: as the ball is ascending, its kinetic energy decreases and the gravitational potential energy decreases. When the ball is at the maximum altitude, the gravitational potential energy is maximum and the kinetic energy is minimum. As the ball is descending, it loses gravitational potential energy and gains kinetic energy. The total mechanical energy is conserved.
Explanation:
Remember, gravitational potential energy is due do the position (altitude) and the kinetic energy is due to motion (speed).
Mathematically they are:
Gravitational potential energy = mass × gravitaional acceleration × altitude
Kinetic energy = mass × speed² / 2.
Total mechanical energy = gravitational potential energy + kinetic energy.
The ball starts with a very low gravitational potential energy (low altitude) and high kinetic energy (high speed), as the travels upward and far away from the hitter, the kinetic energy is transferred to gravitational potential energy, so the ball gains altitude and loses speed.
When the ball reaches the maximum altitude, it has lost all the vertical speed, and the kinetic energy is at a minimum level, while its gravitational potential energy is at the maximum.
From that point, the ball starts to descend, losing grativational potential energy and gaining kinetic energy. At the moment that the ball reaches the ground it will be again at the minimum grativational potential energy and maximum kinetic energy.
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When hydrogen (H2) and chlorine (Cl2) gases are mixed, hydrogen chloride (HCl) is produced. Hydrogen chloride is classified as what type of matter?
Which of the following is the largest contributor to the salt ions in the ocean?Select one of the options below as your answer:a. sodium b. chloride c. sulfates d. calcium
(2) The ion is negatively charged because it has more electrons than the atom.
(3) The ion is positively charged because it has fewer electrons than the atom.
(4) The ion is positively charged because it has more electrons than the atom.
Answers
The following conclusion can be made if an ion of an element is smaller than an atom of the same element:
Further explanation:
Ions are the entities with a net electric charge, be it positive or negative. Since positive and negative charges can be present on the ions, ions are of two types-positively charged and negatively charged ions. The ions formed by loss of electrons develop a positive charge and are called cations. But the ions produced by the gain of electrons acquire a negative charge and are called anions.
Since cations are positively charged ions, these have fewer electrons as compared to the corresponding neutral atom. So these ions experience stronger forces of attraction with the atomic nucleus and are smaller in size in size than the parent atom.
Anions are formed by the addition of electrons to the neutral atom. It has more electrons than the parent atom so it feels electron-electron repulsion due to which its size becomes larger than the parent atom.
So cations are smaller than the parent atom of the same element whereas anions are larger than the parent atoms. Therefore if an ion is smaller than the atom, it is positively charged due to the presence of fewer electrons than the parent atom.
Learn more:
- Component of John Dalton’s atomic theory: brainly.com/question/2357175
- Basis of investigation for the scientists: brainly.com/question/158048
Answer details:
Grade: Senior School
Chapter: Atomic structure
Subject: Chemistry
Keywords: ions, cations, anions, loss, gain, electrons, net electric charge, electron-electron repulsion, parent atom, smaller, larger, size, neutral atom, positive charge, negative charge.
Answers
The intermolecular forces increase with increasing polarization of bonds. The strength of intermolecular forces (and therefore impact on boiling points) is ionic > hydrogen bonding > dipole dipole > dispersion. "Boiling point increases with molecular weight, and with surface area" says one article
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It can save five times its purchase price in electricity cost because it contains toxic mercury that is equivalent in working: electrons that are bound to mercury atoms are excited to states where they will radiate ultraviolet light as they return to lower energy level, this ultraviolet light will be converted into visible light as it strikes to the coating of the bulb. Like LED that is high-efficiency house lighting.
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Or do you want it in a reaction problem?
precipitation
perception
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Watering isn't the right term.
Perception is seeing something.
Answer:
Precipitation
Explanation:
chemical precipitation of a solid
production of a gas
change in volume
Answers
Answer: Option (d) is the correct answer.
Explanation:
A change that does not cause any difference in chemical composition of a substance are known as physical change.
For example, shape, size, mass, volume, density, etc of a substance are all physical changes.
And, a change that causes changes in chemical composition of a substance is known as chemical change.
For example, precipitation, reactivity, toxicity etc are chemical change.
Therefore, change in temperature, chemical precipitation of a solid, production of a gas are all indications of a chemical change.
Thus, we can conclude that change in volume would not necessarily indicate a chemical reaction.
Final answer:
Of the options provided, a change in volume would not necessarily indicate a chemical reaction. It could also be a sign of a physical change, such as a change in state.
Explanation:
The question is asking which of the listed factors would not necessarily indicate that a chemical reaction has taken place. From the options provided, a change in volume is not necessarily indicative of a chemical reaction. Other signs (like change in temperature, chemical precipitation of a solid, or production of a gas) are often valid signs of a chemical reaction, however, just a volume change could also be a sign of a physical change, such as a change in state from solid to liquid, or liquid to gas.
For example, when ice melts to water, or water evaporates to steam, it experiences a change in volume. This does not involve the forming or breaking of chemical bonds, thus it's not a chemical reaction, but a physical change.
Learn more about Chemical Reaction here:
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