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monitta
3 years ago
14

When should a lab coat, safety goggles, and gloves be worn in the laboratory?

Chemistry
2 answers:
Sever21 [200]3 years ago
8 0
I would say that you should wear a lab coat, safety goggles, and gloves when the teacher says so - not everything in a lab is dangerous, so there is no need to always wear these. But when the teacher says you should - then you should. 
Genrish500 [490]3 years ago
5 0
I would say you should wear it in a lab when you are working with dangerous chemicals. not any chemical is dangerous. hope this helped! :)
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Anouk does 150 J of work using a hammer to pull a nail out of a piece of wood, and the hammer does 105 J of work on the nail. Wh
astraxan [27]
The efficiency of any machine is given by:

efficiency = output obtained / input given

Substituting the values,
Efficiency = 105 / 150
Efficiency = 0.7

Converting this to a percentage, the efficiency of the hammer is 70%.
This is a fairly high efficiency, and this is due to the fact that the hammer is a simpler machine. The more complex a machine is, the greater are the losses in it due to friction, meaning there is a lower efficiency.
6 0
4 years ago
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Which organic compound builds, maintains, and replaces tissue in your body? A. protein B. carbohydrates C. lipids
Lena [83]
The answer is c. lipids
5 0
3 years ago
According to the rate law, how do concentrations affect rate?
IrinaK [193]
D, the rate increases as concentrations increase.

Typically, reaction rates decrease with time because reactant concentrations decrease as reactions are converted to products. Reaction rates generally increase when reactant concentrations are increased.
6 0
3 years ago
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What mass of butane in grams is necessary to produce 1.5×103 kJ1.5×103 kJ of heat? What mass of CO2CO2 is produced? Assume the r
saul85 [17]

32.8 g of Butane is required and 99.3 g of CO₂ is produced

<u>Explanation:</u>

The above mentioned reaction can be written as,

C₄H₁₀(g) + 13 O₂(g) → 4CO₂(g) + 5 H₂O(g)     where ΔH (rxn)= -2658 kJ

It is given that 1.5 × 10³ kJ of energy is produced, the original reaction says that 2658 kJ of heat is produced, which means that less than one mole of butane is used in the reaction.

That is

$\frac{1500}{2658}=0.564 \text { moles }    of butane reacted

Now this moles is converted into mass by multiplying it with its molar mass  = 0.564 mol × 58.122 g / mol

                     = 32.8 g of butane.

Mass of CO₂ produced = 0.564 ×44.01 g /mol × 4 mol

                                        = 99.3 g of CO₂

Thus 32.8 g of Butane is required and 99.3 g of CO₂ is produced

7 0
3 years ago
Please help me :( Thank you so much ❤️
m_a_m_a [10]

Answer:

G- Gallons-Miles

Explanation

Even though gallons of gas are converted to miles you cannot physically convert gallons of something to miles.

6 0
3 years ago
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