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2 years ago

Why are lab rules important

Chemistry

2 answers:

valentina_108 [34]2 years ago

6 0

Answer:

Because you can die if you dont be safe my guy.

If you dont

be safe in a lab it can be very dangerus and some times even deadly.

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tino4ka555 [31]2 years ago

6 0

Answer:

if we do not have lab rules then something could go wrong like we could die or like what happened right now CORONAVIRUS that is why lab rules are so important to prevent things like this from happening

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Most geologists think that the movement of Earth's plates is caused by

butalik [34]

Answer: C. Convection currents in the asthenosphere.

Explanation: Most geologists think that the movement of Earth's plates is caused by convection currents in the asthenosphere.

***If you found my answer helpful, please give me the brainliest, please give a nice rating, and the thanks ( heart icon :) ***

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2 years ago

What are the two properties of Graphite that are different from the properties of Diamond?

Rus_ich [418]

Answer:

Graphite is insoluble in water and organic solvents - for the same reason that diamond is insoluble. Attractions between solvent molecules and carbon atoms will never be strong enough to overcome the strong covalent bonds in graphite. conducts electricity.

Explanation:

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3 years ago

Calculate the energy (in kJ) required to heat 10.1 g of liquid water from 55 oC to 100 oC and change it to steam at 100 oC. The

Maksim231197 [3]

Answer:

$\large\boxed{\large\boxed{24.6kJ}}$

Explanation:

1. Energy to heat the liquid water from 55ºC to 100ºC

$Q=m\times C\times \Delta T$

m = 10.1g

C = 4.18g/JºC

ΔT = 100ºC - 55ºC = 45ºC

$Q=10.1g\times 4.18J/g\ºC\times 45\ºC=1,899.81J$

2. Energy to change the liquid to steam at 100ºC

$L=\lambda \times n$

λ = 40.6kJ/mol

n = 10.1g / 18.015g/mol = 0.5606mol

$L=40.6kJ/mol\times 0.5604mol=22.76214kJ=22,762.14J$

3. Total energy

$1,899.81J+22,762.14J=24,661.95J\approx24,662J\approx24.6kJ$

7 0

3 years ago

Substance in which two or more elements are combined in a fixed proportion

Firdavs [7]

Answer: compound

Explanation:

Element is a pure substance which is composed of atoms of similar elements.It can not be decomposed into simpler constituents using chemical reactions.Example: Copper $Cu$

Compound is a pure substance which is made from atoms of different elements combined together in a fixed ratio by mass.It can be decomposed into simpler constituents using chemical reactions. Example: water $H_2O$

Mixture is a substance which has two or more components which do not combine chemically and do not have any fixed ratio in which they are present. Example: Air

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3 years ago

When electrons are added to the outter most shell of carbon atom it forms

GalinKa [24]

Answer:

An anion that has a larger radius.

Explanation:

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3 years ago