When should a lab coat, safety goggles, and gloves be worn in the laboratory?
always, no exceptions
always, unless the teacher instructs otherwise
only when the teacher says to wear them
never in chemistry labs

Answer:

Explanation:

Part A

2 Al + 3 Cl_2 ==>  2 AlC_3

Part B

The balanced equation tells you for every 2 mols of Al you will produce 2 mols of AlCl_3

Find the mass of 1 mol of AlCl_3

Mass Al =                    27

Mass 3Cl = 3*35.5 = 106.5         Add

Mass 1 mol AlCl_3 = 133.5

Answer: 2 mols of AlCl_2 = 267.0 grams

Answer:

Sodium Hydroxide!

Explanation:

- The equation above is balanced.

Hence, the other product in the given reaction is sodium hydroxide

Answer:

Explanation:

KI:

The name of salt consist of two parts. The first part is the name of metal and second is the name of nonmetal.

So we name the cation first and then anion.

IN given formula cation is potassium while anion is iodine.

The -ine of anion is converted into -ide. Thus the name will be potassium iodide.

Fe₂O₃

First of all we will write the name of cation and then anion.

               Iron    oxygen

Then the we will add -ide at the end of name of anion such as, oxide, chloride, fluoride etc.

               Iron oxide

Now we will calculate the charge on oxygen and iron. We know that the charge on oxide is -2 and thus the total charge on oxygen is 3(-2) = -6. Thus iron must have +3 oxidation state to cancel the charge and make compound neutral. It means 2(+3) = +6

The oxidation state of transition metal will be written in parentheses.

               Iron(III) oxide

(NH₄)₃PO₄

To write the name we must know which is cation and which is anion.

In given formula NH₄⁺ is cation and it carry +1 charge while PO₄³⁻ is anion and it carry -3 charge.

When we write the name we write first the name of cation and then anion.

Here the cation name is ammonium while anion name is phosphate thus the name of compound is ammonium phosphate.

In order to make the compound neutral the opposite charges must be equal to cancel each other.

That's why three ammonium ions are attached with one phosphate ion to make the compound neutral.

Answer:

because of nothing...............................

Considering the definition of Q, the reaction quotient Q has a value of 450.

The reaction quotient Q is a measure of the relative amount of products and reactants present in a reaction at a given time when a reaction has not yet reached equilibrium.

For the reaction aA + bB ⇄ cC + dD, Q adopts the expression:

[tex]Q=\frac{[C]^{c}[D]^{d} }{[A]^{a} [B]^{b} }[/tex]

That is, Q is defined as the ratio between the equilibrium concentrations of products and reactants raised to their respective stoichiometric coefficients, at a given temperature.

Comparing Q with Kc allows us to find out the state and evolution of the system:

In this case the system is:

H₂(g) + I₂(g) ↔ 2 HI(g)

So, Q adopts the expression:

[tex]Q=\frac{[HI]^{2} }{[H_{2} ] [I_{2} ] }[/tex]

You know:

Replacing in the expression of Q:

[tex]Q=\frac{(3 M)^{2} }{(0.2 M) (0.1 M)}[/tex]

Solving:

[tex]Q=\frac{9 M^{2} }{0.02 M^{2} }[/tex]

Q= 450

Finally, the reaction quotient Q has a value of 450.

In this case, the reaction quotient is greater than the equilibrium constant, Q > Kc. Then, the system is not in equilibrium. The forward reaction predominates and the system will evolve to the left to increase the concentration of reactants.

Learn more about reaction quotient Q:

https://brainly.com/question/26610333

https://brainly.com/question/13466869

Answer:

89.86 g/mol

i hope it help:^

♡♡

Some of the negative consequences of cobalt mining are pollution and child trafficking.

Many young children are made to work in mines generally either due to continued struggle for survival or forced into it by child traffickers.

Apart from that, cobalt mining causes pollution in the environment. Inhalation of dust containing cobalt causes a host of health issues such as lung cancer and damage to human skin.

Other effects include soil degradation and pollution, water pollution due to mine run-offs, etc.

More on the effects of mining can be found here: https://brainly.com/question/2365629

Answer:

one.

Which of the following are negative consequences of cobalt mining in the Democratic Republic of Congo? Select the two correct answers.

Dust from cobalt mines causes lung and skin damage.

Thousands of children work in cobalt mines.

2.

Which of the following statements about recycling electronic waste is true?

Minerals can be extracted from recycled electronics.

3.

Which of the following resources is a conflict mineral used in smart devices?

tin

Explanation:

its all right 200% if you dont hink so thats all right check for your self

Answer:

Dictionary definition below

Explanation:

"(of a liquid) having been purified by undergoing heating and condensation."

Hope this helps :)

Answer:

of a liquid because i just know please dont question my intelligence

Answer:

I think it’s b

Explanation:

The boiling point of aluminum is 2519 degrees Celsius ( hope this helps! )

Answer:

90

Explanation:

because i ansered this before

The pOH of a solution is 6, then the pH of the solution is 8 moles per liter.

pOH of any solution defines as the negative logarithm of the concentration of hydroxide ions (OH⁻).

In the question given that,

pOH of the solution = 6

i.e. -log[OH⁻] = 6

[OH⁻] = 10⁻⁶

Also we know that, pH + pOH = 14

pH = 14 - 6 = 8 mol/L

Hence, pH of the solution is 8 mol/L.

To know more about pH & pOH, visit the below link:

https://brainly.com/question/24595796

Question

Answer

Explanation

Radio Frequency Is one of the electromagnetic frequency waves that lie in the range stretching from below 3 kilohertz to around 300 gigahertz and which includes the frequencies used for communication signals (such as for radio and television broadcasting and cellular telephone and satellite transmissions)

I hope this helps

Answer:

Explanation:

n = 1.23

V = 3.00 L

T = 32C = 305.15K

P = ?

Follow this equation below

P x 3.00 = 1.23 x 0.08206 x 305.15K

P x 3.00 = 30.8

Dividing both sides by 3.00

P = 10.3 atm

Hope this helps!!

The pressure inside a 3.00 L ball that contains 1.23 moles of air at 32 degrees C is 10.25 atm.

Pressure of gas will be calculated by using the ideal gas equation as:

PV = nRT, where

On putting all values, we get

P = (1.23)(0.082)(305) / (3) = 10.25 atm

Hence required pressure is 10.25 atm.

To know more about ideal gas equation, visit the below link:

https://brainly.com/question/12873752

#SPJ2

Answer:

they are inversly related

Explanation:

As the force increases distance decreases .They are related with an equation

F= Gm1×m2/r^2

Answer:

A sun

Explanation:

sunThe core of the sun is so hot and there is so much pressure, nuclear fusion takes place: hydrogen is changed to helium. Nuclear fusion creates heat.

Answer:

This question is incomplete

Explanation:

This question is incomplete because the result of the described experiment would have better determined the type of scientific explanation to profer. However, the type of material that will preserve the relative hotness or temperature of the hot coffee for the longest time will be a material than can resist heat transfer. These materials tend to keep hot substances hot by not allowing the heat of the coffee to be conducted or pass through it. These materials are mostly insulators or made by placing an insulator between two heat conductors.

Generally, heat is usually transferred from a region of higher concentration to a region of lower concentration, hence when the heat is denied of this transfer, the heat will remain trapped in the "heat-donor" substance (in this case the hot coffee). Thus, the material chosen (A, B or C) will be the material that resists heat transfer the most based on the explanation above.

Answer:

Because they wear rubber gloves

Answer:

Both will be the same

Do refer to the calculation above, hopefully it matches your answer.

Answer:

2.52atm for sure

Explanation:

We know that:

P1= 2.80atm

T1= 400k

T2= 360k

And we want to find P2= ?

We have an equation: P1/T1 = P2/T2

Multiple both side by T2 to remove it

P2 = 2.52

Answer:

Na, K, Fe, Zn, Br,

Explanation:

look at periodic table. size increases left to right and from top to bottom.

Answer:

Si₁₄ = 1s² 2s² 2p⁶ 3s² 3p²

Explanation:

Silicon is present in group 14 of periodic table.

It is blue-gray color metalloid.

Its atomic mass is 28 g/mol.

It is mostly used to make allow.

The most important alloy are Al-Si and Fe-Si. These are used to make different machine tools, transformer plates, engine etc.

Its atomic number is 14 and electronic configuration can be written as,

Electronic configuration:

Si₁₄ = 1s² 2s² 2p⁶ 3s² 3p²

The noble gas electronic configuration or abbreviated electronic configuration can also be written.

Si₁₄ = [Ne] 3s² 3p²

The atomic number of neon is 10. Its electronic configuration is,

Ne₁₀ = 1s² 2s² 2p⁶

That's why we write [Ne] for 1s² 2s² 2p⁶ in abbreviated electronic configuration of Si.

Answer: 1(2)+6(2)=14

Explanation:

Not sure, but maybe.

Answer: Basilosaurus is a prehistoric whale which lived approximately 40 million to 34 million years ago during the Late Eocene Period.

Explanation:

Answer:

11. I think the answer is, Both humans and whale embryos have a tail and a backbone (I'm not sure).

12. Basilosaurid, any member of the family Basilosauridae, an early group of whales that lived from the middle Eocene to the late Oligocene Epoch (about 41 million to 23 million years ago).

13.  Protocetids had long snouts, large eyes, and their nasal opening was farther caudally than in earlier archaeocetes.

Hope this helps! :D

Answer:

c

Explanation:

QUESTION :WHAT TYPE OF BOND IS CA + AR

ANSWER :

C .

COVALENT.

HOPE IT HELP

THANK ME LATER.

Answer:Newton's third law of motion is naturally applied to collisions between two objects. In a collision between two objects, both objects experience forces that are equal in magnitude and opposite in direction. Such forces often cause one object to speed up (gain momentum) and the other object to slow down (lose momentum

Explanation:

Answer:

the difference in the motion of molecules in an atom when its in the solid, liquid and gas state is that they move slower or faster dependant on which state they are in, solids having the slowest moving particles and gasses having the fastest moving particles

Answer: it’s d all of the above

Explanation: