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3 years ago

7

Which three of the five items would be best to include in a safety contract?

2 answers:

ValentinkaMS [17]3 years ago

7 0

Student Safety Contract - Flinn Scientific
ties which require the use of hazardous chemicals. Safety in ... vided to you in this student safety contract. ... 3. Never work alone. No student may work in the laboratory without an instructor ... Look for things such as.
Missing: five ‎| Must include: five

jok3333 [9.3K]3 years ago

6 0

Answer:

(1) Label all containers

(2) Tie long hair back

(5) Wear safety goggles at all times

Explanation:

Took the test on Edge. Hope this helps! :)

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Suppose these substance were placed in a freezer set to -50 grades celsius. Which substance would become a liquid. Clorine, Merc

Vadim26 [7]

Chlorine would become a liquid. Its boiling point is around -34 Celsius so at any temperature below that it would be liquid.

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3 years ago

Which of the following is a property of water

lozanna [386]

Answer:

Where are the following?

Explanation:

The main properties of water are its polarity, cohesion, adhesion, surface tension, high specific heat, and evaporative cooling.

7 0

3 years ago

Read 2 more answers

The CO2 that builds up in the air of a submerged submarine can be removed by reacting it with sodium peroxide. 2 Na2O2 (s) + 2 C

grandymaker [24]

Answer: The sodium peroxide needed per sailor in a 24 hr period is 674 grams.

Explanation:

According to ideal gas equation:

$PV=nRT$

P = pressure of gas = 1.02 atm

V = Volume of gas = 150.0 ml = 0.15 L

n = number of moles of carbon dioxide = ?

R = gas constant = $0.0821Latm/Kmol$

T =temperature = $20^0C=(20+273)K=293K$

$n=\frac{PV}{RT}$

$n=\frac{1.02atm\times 0.15L}{0.0821 L atm/K mol\times 293K}=0.006moles$

$2Na_2O_2(s)+2CO_2(g)\rightarrow 2Na_2CO_3(s)+O_2(g)$

According to stoichiometry:

2 moles of carbon dioxide require = 2 moles of sodium peroxide

Thus 0.006 moles carbon dioxide require= $\frac{2}{2}\times 0.006=0.006$ moles of sodium peroxide

Mass of sodium peroxide needed for 24 hour= $moles\times {\text {Molar mass}}=0.006mol\times 78g/mol\times 24\times 60=674g$

Thus sodium peroxide needed per sailor in a 24 hr period is 674 grams.

4 0

2 years ago

Please help me with these! Mark brainliest

bearhunter [10]

Answer:

1. Alkalinity

2. True

3. Red

Explanation:

1. 8-14, which are the bases, are alkaline

2. Salt lowers the melting/freezing point of water

3. Blue --> Red is Acid

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3 years ago

Substance A has a melting point of 80 degrees celsius and substance B has a melting point of 69 degrees celsius. If you start wi

Rus_ich [418]

Answer:

it would not melt at a specific point

Explanation:

becuase it is not pure

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3 years ago