CHEMISTRY MIDDLE SCHOOL

How can quartzite be distinguished from quartz sandstone? A. The mineral compositions are different.

B. Quartzite is not granular, while sandstone is granular.

C. Quartz sandstone has undergone metamorphism, while quartzite has not.

D. A broken piece of quartzite will break through, not around, quartz sand grains.

Answers

Answer 1
Answer:

D. A broken piece of quartzite will break through, not around, quartz sand grains.

Quartzite and quartz sandstone have the same chemical formula (SiO_2)

Quartzite is a metamorphic rock. Heat and pressure have compressed the sand into a strong network of interlocking quartz grains.

Quartzite is so tough that it breaks through the sand grains rather than around them as in sandstone.
Answer 2
Answer:

Answer:

D. A broken piece of quartzite will break through, not around, quartz sand grains

Explanation:

:)

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In a longitudinal wave the motion of a disturbance is _____ to the wave motionA.parallel
B.opposite
C.perpendicular
D. in the same direction

Answers

Answer: The correct answer is Option A.

Explanation:

Waves are characterized into two types:

  1. Transverse wave: These waves are the waves where, particles of the medium travel perpendicularly to the direction of the wave. These waves do not require any medium to travel and can travel in vacuum also. For Example: Light waves.
  2. Longitudinal waves: These waves are the waves, where particles of the medium move in the direction of the wave which means that the particles move parallel to the direction of the wave. These waves requires a medium to travel. For Example: Sound Waves.

Hence, the correct answer is Option A.
It is parallel. The direction of energy transfer is parallel to oscillation of particles in the medium. 

What happened to global temperatures after the eruption of mt pinatubo

Answers

Scientists measured a drop in the average global temperature of about 1 degree F (0.6 degrees C).

What coefficient values will balance the reaction?Mg + O2 ?MgO
A. 1,2,1
B. 1,2,2
C. 2,1,2
D. 1,1,2

Answers

Answer:

B

Explanation:

1,2,2

we O2 then we supposed to balance the one that will give Mg+O2-2MgO

Which is true according to the law of conservation of energy?

Answers

Answer:

The answer is C

Explanation:
There are no options but law of conservation of energy states that energy can’t be created or destroyed.

Preserved remains have turned to what?

Answers


It depends on what the remains are. If you are looking for a word, it could either be fossils or if it is something that has preserved the soft tissue it can be described as mummified.

What is the greatest number of electrons in the first seven energy level ​

Answers

Answer:

280 electrons

Explanation:

The number of electrons in each energy level are determine by using following formula:

2n²

Here "n' is the energy level. we will put the energy level number in place of "n" and number of electrons will easily found.

Principle energy levels                        number of electrons

             1                                                     2n² = 2(1)²= 2

             2                                                     2n² = 2(2)²= 8                                    

             3                                                     2n² = 2(3)²= 18

             4                                                     2n² = 2(4)²= 32

             5                                                     2n² = 2(5)²= 50

             6                                                     2n² = 2(6)²= 72

             7                                                      2n² = 2(7)²= 98

So the total number of electrons in first seven energy levels will be the sum of the number of electrons in each energy levels.

2+8+18+32+50+72+98 = 280 electrons

                                                         

           
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