John Dalton published his atomic theory in the early 1800’s. It has been revised since this time, but some points still remain true. In your own words, identify at least one part of Daltons’ theory that is still considered accurate and at least one part that has been disproven. Provide support for your answer.

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Answer 1

Answer: The main part of Dalton's theory that remains true is that the atoms are not created, destroyed or splited during a chemical reaction which is the principle of the mass conservation law applied to the chemical reactions.

Two wrong points are that Dalton affirmed that the atoms could no be divided into smaller particles (atoms can be divided into several subatomic particles) and that the atoms of a same element are identicals (isotopes are atoms of a same element that differ in the number of neutrons)

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What is the French word for shepherds crook

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The answer would be:

Houlette de berger.

"shepherd's crook" means "houlette de berger" in french

Scientists use models to A) increase the duration of a volcanic eruption
B) change the location of a volcanic eruption
C) predict the damages due to an earthquake
D) stop the occurrence of tsunamis due to an earthquake

Answers

D Is Thw Correct answer

When Jane drives to work, she always places her purse on the passenger’s seat. By the time she gets to work, her purse has fallen on the floor in front of the passenger seat. One day, she asks you to explain why this happens in terms of physics. What do you say?

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Explanation: There may be different explanations:

Suppose that Jane's car has a built some sped, and she sees a stoplight. Now she needs to stop the car (decelerating the car)

When she does this, she creates a force that holds the car until it is full stop, but this force is applied only on the car, the purse that is on the passenger seat only feels this force by the friction that the seat does in his surface, but the purse has built some moment because it was inside the car, and the friction force that the seat does may not be enough to also stop the purse. So when Jane stops, the purse keeps moving forward, and then it falls down of the seat.

At some time during her drive she backed up with a substantial negative. ( backwards) acceleration. Since the pocket book is not physically connected to the seat it is free to move. Upon rapid negative acceleration the pocket book remains in its position while the car accelerates backwards away from it. this demonstrates Newtons 1st law of motion. The first law is the law of inertia. Which states, an object at rest. ( pocketbook) will remain at rest and an object in motion will continue in motion at constant velocity, unless acted upon by some outside force to change its motion.

What is the average speed in m/s for a car that travels 28 km in exactly 12 min?

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Answer:

approximately 38.89 m/s.

Explanation:

To calculate the average speed, you can use the formula:

Average Speed = Distance / Time

Given:

Distance = 28 km

Time = 12 minutes = 12/60 hours = 0.2 hours

Now, plug in the values:

Average Speed = 28 km / 0.2 hours = 140 km/h

To convert the average speed from km/h to m/s, you can use the conversion factor: 1 km = 1000 m and 1 hour = 3600 seconds.

Average Speed = (140 km/h) * (1000 m/km) / (3600 s/h) ≈ 38.89 m/s

Send helpI have to do test corrections but I have no idea what the speed vs time graph should look like

Answers

Answer:

Explanation:

at the same instant means in the same moment, same time thus A and B share the same starting time which is t=0

classify the following substances as acidic, basic, or neutral: a. a soapy solution, pH = 9 b. a sour liquid, pH = 5 c. a solution with four times as many hydronium ions as hydroxide ions

Answers

A. Soapy solution (pH of 9) = basic
B. Sour liquid (pH of 5) = acidic
C. Solution with four times as many hydronium (H+) ions as hydroxide ions (OH-) = acidic

Soapy solution with a pH of 9 is basic because it has a pH greater than 7. The same goes for the sour liquid with a pH of 5, which has a pH lower than 7, making it acidic. The word sour also hints at it being acidic because of the definition of Bronsted acids. Finally, higher H+ ion concentrations make a solution more acidic.

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