When a piece of wood burns, it makes heat, light, and ash. Therefore, it is an example of what type of change

Viktor [21]

For the "what is this investigation about", you could pick
the shape of the Earth, the size of the Earth, how the Sun
generates its energy, the distance to the Moon, why the
sky is blue ... things like that. There are millions uvum.

Trustworthy sources of information:
-- an Encyclopedia
-- a library book that's all about the subject of the investigation
-- a magazine that's all about exactly the subject of the investigation
-- a TV program that's ALL ABOUT the subject of the investigation
-- a teacher who teaches the subject of the investigation
-- a high school student whose hobby is the subject of the investigation
-- an adult whose hobby is the subject of the investigation
-- an adult whose JOB is the subject of the investigation
-- a high school student who got a very good grade in a course
where the subject of the investigation was taught
-- a college student who is studying the same subject as the investigation

UN-trustworthy sources of information:
(This doesn't mean that they're always wrong. It means that
they can tell you something, and you just can't be sure of
whether it's right or wrong.)
-- some sources listed on Google
-- some YouTube videos
-- other students in your class
-- other students at your school
-- your next-door neighbor (unless he's on the 'trustworthy' list above)
-- a newspaper article
-- a TV news item, or a TV program that's NOT all about the subject
-- a public opinion poll; (just because everybody thinks so
doesn't mean that it's true)
-- your sister's friend's hairdresser's grocer's mother-in-law
-- anything you hear if you don't know WHO said it

5 0

4 years ago

How do scientists determine the age of the solar system?

Sholpan [36]

By studying meteorites which are the most ancient material in space.

7 0

3 years ago

If the speed of an object increases, the kinetic energy will ______________ because _____________________________________.

Svetlanka [38]

Increase because kinetic energy is all about the speed of an object and the more speed the more kinetic energy.

5 0

3 years ago

In a science lab, Thomas used "universal indicator" to investigate the pH of some household products. He created a reference tab

dolphi86 [110]

Usually

pH scale measures from 1 to 14

Purple colour indicates pH as 14

Hence it's an base

But it doesn't react with metals to form salts and hydrogen gas.

It's sure it's non metal but not base

One possibility is that it's Carbon compound or Graphite compound which reacts like base but a metal in real sometimes

6 0

2 years ago

Please answer number 24 and 25 thank you

Tomtit [17]

24) B. Energy enters and exits the system matter does not

25) B. Energy is neither created nor destroyed; it is transformed and transferred.

Explanation:

24)

There are three types of systems in thermodynamics:

- Open system: an open system is a system in which both matter and energy are exchanged with the surroundings. An example of open system is an open bottle with some liquid inside.

- Closed system: a closed system is a system in which matter is exchanged with the surroundings, but energy cannot enter and exit the system. An example of closed system is a closed bottle: in fact, the air and the liquid cannot enter or exit the bottle, but heat can be exchanged through the walls of the bottle.

- Isolated system: an isolated system is a system in which neither matter nor energy can be exchanged with the surroundings. An example of isolated system is a sealed thermal container: in fact, air/liquid cannot leave the bottle, and heat cannot pass through the walls.

Therefore, the statement that best describes the island food web as a closed system is

B. Energy enters and exits the system matter does not

25)

The law of conservation of energy states that for an isolated system, the total energy of the system is constant: therefore, energy cannot be created or destroyed, but only transformed or transferred into different forms.

The Universe is an example of isolated system: as we assume that there is nothing outside the universe, the total energy of the universe must be constant.

An example of application of the law of conservation of energy is for an object in free fall: as the ball falls, if there are no frictional forces/air resistance acting on the ball, the total energy of the ball (given by the sum of its potential energy and its kinetic energy) is constant, and therefore as the ball falls down, there is a conversion of energy from potential energy to kinetic energy.

Therefore, the correct choice is

B. Energy is neither created nor destroyed; it is transformed and transferred.

Learn more about thermodynamics:

brainly.com/question/4759369

brainly.com/question/3063912

brainly.com/question/3564634

#LearnwithBrainly

8 0

3 years ago