What is the difference between chemical and physical changes

Answers

Answer 1

Answer: There are several differences between a physical and chemical change in matter or substances. A physical change in a substance doesn't change what the substance is. In a chemical change where there is a chemical reaction, a new substance is formed and energy is either given off or absorbed.

Answer 2

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Identify and explain the three different ways that charge is built up on an object.

Answers

Answer:

There are three ways to charge an object: friction, conduction and induction. Friction involves rubbing on material with another, resulting in electrons moving from one surface to another. ... Friction is useful for charging insulators, which are materials that aren't good conductors.

Explanation:

What did astronomers name the planet they discovered?

Answers

astronomers named the planet Kepler-186f

Astronomers named the planet they discovered Kepler-186f after the Kepler space telescope, which took the first picture of the planet.

What is the main cause of erosion

Answers

Erosion is mainly caused by water, wind, and gravity.

Erosion is caused by human activities like excessive construction, agriculture, surface mining and forestry. Removing the vegetative cover accelerates erosion, which is often caused by grazing, logging or cultivating. In some cases, it can be removed by pests like pigs, rabbits and goats.

A scientific study is repeated by four different groups. Only two groups get the same results. Are the data reproducible?

Answers

No, one more group must get the same result as the other group. This will make it more reliable and reproducible.

What are the 3 things needed to make hurricane

Answers

Low air pressure, warm temperatures, and tropical winds near the equator.
Thanks,
-LittleManOfCheese

Warm sea surface temperatures, light winds, and rotation or spin.

A wave's frequency is 2Hz and its wavelength is 4 m. What is the wave's speed?

Answers

Wave speed = (wavelength) x (frequency)

= (4 m) x (2 /sec)

= 8 m/sec

Final answer:

The speed of a wave is calculated by multiplying the frequency by the wavelength. For a wave with a frequency of 2Hz and a wavelength of 4m, the speed is 8m/s.

Explanation:

The subject of your question is Physics, specifically the behavior of waves. The speed of a wave can be calculated using the equation speed = frequency ×wavelength. Given that the frequency of your wave is 2Hz (hertz) and the wavelength is 4m (meters), we substitute these values into our equation.

Thus, the speed of the wave is 2Hz × 4m = 8 m/s. Therefore, the wave is moving at a speed of 8 meters per second.

Learn more about Wave Speed here:

brainly.com/question/32040742

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Hard well organized solid Atoms are tightly packed together Crystalline arrangement High melting and boiling point. The characteristics listed describeA) ionic compounds. B) covalent compounds. C) diatomic molecules. D) molecular compounds.

I'm giving out a lot of points for whoever helps me and answers correctly! 3 questions to answer! Please answer them ALL!!! :D1 - Which of these is a good example of Newton's First Law of inertia?A) A ball sits motionless on the groundB) A ball gathers speed as it rolls downhillC) A ball accelerates as it falls out of a classroom windowD) A ball returns to your hand after you throw it up in the air2 - The space shuttle is located exactly half way between the earth and the moon. Which statement is true regarding the gravitational pull on the shuttle?A) The moon pulls more on the shuttleB) The earth pulls more on the shuttleC) Both are equal due to equal distancesD) Both are equal due to the mass of the shuttle3 - In which situation is the acceleration of the car negative?A) The velocity of the car was 75/h over 4 hoursB) The velocity of the car reduced from 50 km/h to 35 km/h over one minuteC) The velocity of a car increased from 40 km/h to 75 km/h over 15 minutesD) The velocity of a car was 45 km/h at 2:00 pm and at 4:00 pm the velocity of the car was 85 km/h