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skelet666 [1.2K]
4 years ago
14

Which of these is NOT an example of physical change?

Chemistry
1 answer:
forsale [732]4 years ago
5 0

Answer:

D. A change of appearance

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Please help me!!!!!
kvasek [131]

election circles the nucleus

6 0
3 years ago
Which of the following statements is not a description of neptune?
KIM [24]
The appropriate answer is B. Has no atmosphere. Neptune is a gas giant and is the eight planet in the solar system. It has a thick atmosphere consisting of hydrogen, helium and methane. Neptune has at least eight moons with Triton being the largest.

Neptune has four rings which circle the planet. The rings are made of dust particles, similar to the rings of Saturn.
6 0
4 years ago
Read 2 more answers
Ammonium perchlorate NH4ClO4 is a powerful solid rocket fuel, used in the Space Shuttle boosters. It decomposes into nitrogen N2
Bas_tet [7]

Answer:

1.3 mol H₂O

Explanation:

Let's consider the decomposition reaction of ammonium perchlorate.

NH₄ClO₄(s) → 1/2 N₂(g) + 1/2 Cl₂(g) + O₂(g) + 2 H₂O(g)

As we can see in the balanced equation, the molar ratio of ammonium perchlorate to water is 1:2. The moles of water produced by the reaction of 2.5 mol of ammonium perchlorate.

2.5 mol NH₄ClO₄ × (2 mol H₂O / 1 mol NH₄ClO₄) = 1.3 mol H₂O

3 0
3 years ago
Read 2 more answers
When a diprotic acid, , is titrated with , the protons on the diprotic acid are generally removed one at a time, resulting in a
marshall27 [118]

Answer:

At the second equivalent point 200 mL of NaOH is required.

Explanation:

at the first equivalent point:

                              H2A    +     OH-       =     HA-  +     H2O

initial mmoles        y*100         y*100            -                -

final mmoles            0                0                 y*100       y*100

at the second equivalent point:

                              HA-    +     OH-       =     A2-  +     H2O

initial mmoles        y*100         y*100            -                -

final mmoles            -                -                 y*100       y*100

at the second equivalent point we have that y*100 mmoles of NaOH or 100 mL of NaOH ir required, thus:

at the second equivalent point 200 mL of NaOH is required.

4 0
4 years ago
what if your friend joked that a cell is like his little brother's bathtub with tub toys floating in it
Natasha2012 [34]

Answer:

no

Explanation:

a cell is something that either stays inside of something or is a individual floating object and it does not compare to bigger sized materials

5 0
4 years ago
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