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tatiyna
3 years ago
9

5. Which of the following statements is not true?

Chemistry
2 answers:
yaroslaw [1]3 years ago
8 0

Atoms of isotopes of an element have different numbers of protons.

vladimir1956 [14]3 years ago
4 0

i believe the answer is...

Atoms of isotopes of an element have different numbers of protons.

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Which of the following is not a trend that varies systematically in the periodic table
juin [17]

Answer: B: Symbols of Elements

Explanation:

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2 years ago
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1. Calculate the heat change associated with cooling a 350.0 g aluminum bar from
Amanda [17]

Answer:

14175 j heat released.

Explanation:

Given data:

Mass of aluminium = 350.0 g

Initial temperature = 70.0°C

Final temperature = 25.0°C

Specific heat capacity of Aluminium = 0.9 j/g.°C

Heat changed = ?

Solution:

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m.c. ΔT

Q = amount of heat absorbed or released

m = mass of given substance

c = specific heat capacity of substance

ΔT = change in temperature

Heat change:

ΔT = Final temperature - initial temperature

ΔT = 25.0°C - 70°C

ΔT = -45°C

Q = m.c. ΔT

Q = 350 g × 0.9 j/g.°C  × -45°C

Q = -14175 j

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3 years ago
Why can't polyatomic ions ever stand alone?
Basile [38]
The prefix "poly-" means "many," and "atomic" refers to atoms, so a polyatomic ion is made of 2+ atoms covalently bonded together. These ions are charged, which is why they can never stand alone. 
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3 years ago
PLA is a bioplastic that is biodegradable. Explain how is is created and why it is biodegradable.
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Explanation:

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<h3>PLA consists of renewable raw materials and is biodegradable in industrial composting plants. </h3><h3>However, due to the lack of infrastructure, it is difficult to </h3><h3>compost PLA industrially or to</h3><h3> recycle it.</h3>
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2 years ago
Why do rivers have deltas?
Leokris [45]

Answer:

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I hope it's helpful!

7 0
2 years ago
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