A box containing a piece of wood and enough air to burn the wood is measured and found to have a mass of 1.5 kg. If the wood is burned and none of the smoke, ashes, or hot gases are allowed to leave the box, then how will the mass of the box compare to the mass before burning? Will it be more, less, or the same? A. More B. Less C. The same

Answers

Answer 1

Answer:

Answer: C, the same

Explanation:

This is a practical use of the concept of conservation of mass. Mass cannot be created or destroyed, so if you start with 1.5 kg, as long as you dont lose any (which it says you don't) you will end with 1.5kg.

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Under which conditions will the volume of a gas be greatest?A. T=300K and P=0.25 atm
B. T=273K and P=0.25 atm
C. T=300k and P=2 atm
D. T=273K and P=2 atm

Answers

Answer:

help me please

Explanation:

Imagine that you’re observing a collision. Which action would allow you to determine whether the collision is inelastic?A.
Measure the force of impact.
B.
Observe whether the colliding objects change their shape.
C.
Measure the acceleration of the colliding objects.
D.
Measure the mass of the colliding objects.

Answers

Answer:

Its B, observe weather the colliding objects change their shape .

Explanation:

I hope this will help you, if not so advance sorry :)

The earth's four main spheres continuously interact to support life and balance Earth's materials. When plants absorb carbon dioxide for photosynthesis, it is an example of _____ and _____ sphere interaction.biosphere, lithosphere; biosphere, atmosphere; hydrosphere, lithosphere; or cryosphere, lithosphere biosphere, lithosphere biosphere, atmosphere hydrosphere, lithosphere cryosphere, lithosphere

Answers

The correct answer for the question that is being presented above is this one: "biosphere, atmosphere." The earth's four main spheres continuously interact to support life and balance Earth's materials. When plants absorb carbon dioxide for photosynthesis, it is an example of biosphere and atmosphere sphere interaction.

Its "biosphere and atmosphere" because photosynthesis comes from the plants and the atmosphere then consumes the carbon.

Using a good pair of binoculars, you observe a section of the sky where there are stars of many different apparent brightnesses. You find one star that appears especially dim. This star looks dim because it is:_______.

Answers

Answer:

Explanation:

Apparent magnitude in astronomy is the apparent brightness of a star that is seen from the Earth, that brightness can variate according to the distance at which the star is from the Earth or due to its radius.

That can be demonstrate with the next equation:

$F = (L)/(4\pi r^2)$ (1)

Where F is the radiant flux received from the star, L its intrinsic luminosity and r is the distance.

For example, an observer sees two motorbikes approaching it with its lights on but one of the motorbikes is farther, so the light of this one appears dimmer, even when the two lights emit the same amount of energy per second.

That is because the radiant flux decreases with the square distance, as can be seen in equation 1.

In the other hand, a bigger radius means that the gravity in the surface of the star will be lower, allowing that light can escape more easily:

$g = (GM)/(R^2)$ (2)

Where g is the surface gravity in the star, G is the gravitational constant, M is the mass of the star and R is the radius of the star.

John is traveling north at 20 meters/second and his friend Betty is traveling south at 20 meters/second. If north is the positive direction, what are John and Betty's speeds?

Answers

Answer:

The John 's speed is 20 m/s.

The Betty's speed is 20 m/s

Explanation:

Given that,

John is traveling north at 20 meters/second and his friend Betty is traveling south at 20 meters/second.

We need to calculate the John and Betty's speeds

We know that,

The speed is a scalar quantity. its has only magnitude.

Hence, The John 's speed is 20 m/s.

The Betty's speed is 20 m/s

Both of their speeds are 20 m/s.
Direction is not involved in describing speed.

A mole or fraction of a mole represents a _______number of atoms or molecules.a. specific
b. nonspecific

Can I get some help matching these from the left to the right?

1) increased surface area concentration decreases around solute
2) like polarity increases rate rate proportional to K.E.
3) temperature matching solvent and solute
4) stirring finely divided solute

Answers

A mole or fraction of a mole represents a nonspecific number of atoms or molecules. The answer is letter A.

The correct answer is number 2, like polarity increases rate rate proportional to K.E.

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