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Nataliya [291]
3 years ago
9

What refrigerant safety group classification has the highest flammability and the highest toxicity?

Biology
2 answers:
timama [110]3 years ago
3 0

Answer;

-B3

Explanation;

Refrigerants are divided into two groups according to toxicity:

-Class A signifies refrigerants for which toxicity has not been identified at concentrations less than or  equal to 400 ppm;  and

-Class B signifies refrigerants for which there is evidence of toxicity at concentrations below 400 ppm.

They are also divided into three groups according to flammability:

-Class 1 indicates refrigerants that do not show flame propagation when tested in air at 21°C and 101  kPa;

-Class 2 indicates refrigerants having a lower flammability limit of more than 0.10 kg/m3  at 21°C and  101 kPa and a heat of combustion of less than 19 kJ/kg;

-Class 3 indicates refrigerants that are highly flammable as defined by a lower flammability limit of less  than or equal to 0.10 kg/m3  at 21°C and 101 kPa or a heat of combustion greater than or equal to 19  kJ/kg.

-Therefore; the answer for the above question would be Class B and class 3.

Mashcka [7]3 years ago
3 0

Answer:

B3

Explanation:

In the classification of chemical refrigerants of the International Institute of Refrigeration, capital letters correspond to the toxicity level and numbers indicate the flammability level. Since toxicity is divided into categories A and B, and flammability into categories 1 to 3, the highest flammability and toxicity of a refrigerant is indicated by "B3".

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Bacteria grow best in foods that are highly acidic true or false
Novay_Z [31]

Answer:

I think this is false. Bacteria grow best in an environment that is neutral or slightly acidic.

3 0
2 years ago
Are genes a segment of DNA containing a set of instructions for making a protein ?
brilliants [131]

Answer: The given statement is True.

Gene can be described as the segment of DNA ( deoxyribonucleic acid), which codes for a particular protein. The protein thus formed, corresponds to a specific trait ( such as skin color, hair color, color of eye) of the individual organism.

They possess set of  instructions for making a protein in the form of nucleotide sequences. Gene undergo transcription to form mRNA ( messenger RNA), which is then converted into particular protein through translation.

Genes are inherited from parents by their offspring and in this way specific traits are inherited by offspring from their parents.

Thus, given statement in the question is correct.


8 0
3 years ago
During anaphase II in Meiosis, what major event takes place Question 26 options: Sister chromatids are pulled apart. Chromosome
baherus [9]

Answer:

The correct answer is A.) Sister chromatids are pulled apart.

Explanation:

This is because during Anaphase II in Meiosis, the sister chromatids are pulled apart.

Chromosome pairs line up during Prophase I. <em>Not B.</em> When the chromosome pairs pair up this is also Metaphase I. <em>Not C.</em> When chromosome pairs are pulled apart, Anaphase I is occurring.

Hope this helps,

♥<em>A.W.E.</em><u><em>S.W.A.N.</em></u>♥

8 0
3 years ago
The following are assessment finding for a client with pre-eclampsia: blood pressure 158/100; urinary output 50 mL/hour; lungs c
Neko [114]

1)Blood pressure 158/104

2)urinary output 20ml per hour

3)Reflexes 21

4)Platelet count 150,000

Answer: The correct answer is (2) urinary output 20ml per hour

Explanation:

Preeclampsia is a condition in pregnant women, or could develop after delievry, where her blood pressure rises significantly, >140/90 mmHg(recorded on two occasions,atleast 4 hours apart).Moreover urine test indicates protein in her urine(proteinuria), swelling particularly of hands,legs and feet(edema),severe headaches along with many other symtoms.

On the next hourly assessment,

• The client's BP was recorded as 158/104, which is almost the same as it was initially recorded,i.e 158/100, which means her BP did not rise significantly.

•The client's reflexes are normal

•The client's platelet count is normal too, although it is on a lower side(normal range is between 150,000-450,000)

•Decrease in urinary output(20ml/hr) is an indication of worsening of preeclampsia because this indicates there is decreased renal perfusion which may subsequently lead to decreased GFR(glomerular filtration rate).

5 0
3 years ago
The annual precipitation varies most in which of these ecosystem?
pshichka [43]

Answer:

The annual precipitation varies most in tropical rain forest ecosystem.

Explanation:

Tropical rain forest is one of the most extensive selvatic ecosystems, with a very dense vegetation, which is characterized by its high temperatures and abundant and varied annual precipitations, which are between 1500 and 5000 mm per year.

This ecosystem can be found in Central America, Mexico, Australia and even in Asia, where a seasonal climate can be seen divided into rainy seasons -which register the highest rainfall- and a dry season, where rainfall is lower. Most of the year the climate is hot and one of its characteristics is to present the greatest variety of animal and vegetable species.

Tropical rain forest brainly.com/question/11214203

7 0
3 years ago
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