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allochka39001 [22]
4 years ago
5

Decide which action is appropriate when working with glass. get your station good and messy wear baggy clothing wear safety gogg

les over your eyes wet your hands
Chemistry
2 answers:
Vanyuwa [196]4 years ago
5 0
Wear safety googles over yur eyes
kondor19780726 [428]4 years ago
3 0
You should wear safety googles over your eyes! 
Hope this helps
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The wax in a burning candle can be described by both physical and chemical properties. What are the physical properties of the w
dimaraw [331]

Answer:

The change of state of wax from solid to liquid and liquid to vapors is a physical change.

Explanation:

Physical Change                                                                                              

The changes that occur only due to change in shape or form but their chemical or internal composition remain unchanged.  

These changes were reversible.  

They have same chemical property.  

These changes can be observed with naked eye.

Chemical:

The changes, that occur due to change in the composition of a substance and result in a different compound is known as chemical change.  

These changes are irreversible .

These changes occur due to chemical reactions.

These may not be observed with naked eye

Example

When a candle is burned, the both physical and chemical changes occur.

The solid wax is melted into the liquid and than liquid is evaporated into vapor form. It is a physical change because just the state of mater is changed. When vapors of wax are react with oxygen in air and form carbon dioxide and ash it is a chemical change which can not be reversed.

8 0
3 years ago
Calculate the average atomic mass of B. The isotopes and abundances are 10B, 19.80% and 11B, 80.20%. Round answer to 3 significa
timama [110]

Given,

The two isotopes of B are 10B and 11B

% abundance of 10B = 19.80

% abundance of 11B = 80.20

Average atomic mass of B

= \frac{(mass of 10B)(abundance of 10B) + (mass of 11B)(abundance of 11B)}{100}

= \frac{(10)(19.80) + (11)(80.20)}{100}

= \frac{198 + 882.2}{100}

= \frac{1080.2}{100}

= 10.802

Therefore, the average atomic mass of B is 10.802 u

8 0
4 years ago
Read 2 more answers
What happens when nitrogen fills its valence shell?
Sauron [17]
The right answer is D. three electrons are gained, creating N-3

Nitrogen has 5 electrons in it's valence shell and octet rule states that the valence shell must have 8 electrons. To satisfy that, Nitrogen gains 3 electrons that are negatively charged.Therefore, it gets a negative charge.




5 0
3 years ago
Read 2 more answers
His transmitter is mostly located in diffuse neuronal systems in the CNS, with cell bodies particularly in the raphe nuclei. It
joja [24]

Answer: The correct answer is a) Acetylcholine.

Explanation:

The acetylcholine is a very important neurotransmitter involved in the mediation of synaptic activity between neurons. Among its most important functions we find: expression of mood states, vasodilation, gastrointestinal motility, bronchoconstriction, circular iris muscle contraction and sweat gland secretion.

Therefore the correct answer is a) Acetylcholine.

8 0
4 years ago
What is the correct formula for Triphosphorous hexachloride?
zlopas [31]

Answer:

P3

Explanation:

Im pretty sure hope this helps

5 0
2 years ago
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