CHEMISTRY MIDDLE SCHOOL

What effect does observing a substances physical properties have on the substance

Answers

Answer 1
Answer: no effect. only chemical properties change the substance when they are tested

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Which of the following is an exothermatic reaction a) dissolving sugar in wat
b)melting ice
c)oxidation of iron
D) dissolvin ammonium nitrate in water to cool the water

Answers

C, oxidation of iron is the right answer because an exothermic reaction releases energy by light or heat!

Gasoline boils at a relatively low temperature (about 150°C). The kerosene is removed at around 200°C, followed by diesel oil at 300°C and fuel oil at around 370°C.”What topic is the teacher most likely talking about?

Answers

Explanation:

The teacher is most likely talking about the fractional distillation process.

Fractional distillation: It is a separation technique used to separate different components of the given mixture on the basis of their difference in boiling points of the different components. The component with lowest boiling point will get separate out first from the mixture and the vapors formed from boiling are condensed in a separate container.

So, when the fractional distillation of mixture of oils and fuels is carried out  gasoline will separate out first due to lower boiling temperature and then kerosene followed by diesel and others (fuels and oils).

Answer:

distillation of a mixture

Explanation:

What happens when a mechanical wave travels through medium

Answers

energy is transferred
The molecule of the medium vibrates at the dedication in which the wave travels

The atomic number of an atom will always identify the amount of protons in its nucleus. If the atom is neutral, what else is identified by the atomic number? A.
the number of electrons in the atom

B.
the most common isotope of the atom

C.
the number of neutrons in the atom

D.
the atomic mass of the atom

Answers

If the atom is neutral , the atomic number identifies the number of electrons in the atom.

A.

The answer should be

A.  the number of electrons in the atom

Why is magma that contains little silica less likely to erupt explosively?

Answers

Because there is less Silica, there isn't much pressure built up. 

What does it mean to say that momentum is conserved?

Answers

Conservation of momentum. So long as no external forces are acting on the objects involved, the total momentum stays the same in explosions and collisions. We say that momentum is conserved. You can use this idea to work out the mass, velocity or momentum of an object in an explosion or collision.
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