CHEMISTRY MIDDLE SCHOOL

Whats the formula and molar mass of chromium (III) bicarbonate.

Answer fast plz

Answers

Answer 1
Answer:

Answer:

Cr(HCO3)3

Explanation:

Molar mass: 235.0466

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What are the 4 types of fire extinguishers are there

Answers

A-paper, wood, cardboard, and most plastics
B-flammable or combustible liquids such as gasoline, kerosene, grease and oil
C-electrical equipment, such as appliances, wiring, circuit breakers and outlets
D-chemical stuff (like a lab) They are for fires that involve combustible metals, such as magnesium, titanium, potassium and sodium.
I believe there is a K too - involve cooking oils, trans-fats, or fats in cooking appliances and are typically found in restaurant and cafeteria kitchens. 

What are the sum of all forces acting on the object called?

Answers

That would be called the resultant force or net force.

What kind of change occurs when I’ve becomes liquid water

Answers

Answer:

Its a physical

theres no chemical properties involved.

Explanation:

Brainliest please

_____________ can be described as the ‘skin’ on the surface of a liquid due to its cohesive forces.

Answers

Answer:

surface tension

Explanation:
Surface tension




Explanation- Surface tension could be defined as the property of the surface of a liquid that allows it to resist an external force, due to the cohesive nature of the water molecules.

How many orbitals does the n = 4 shell have?
DONE

Answers

There are 16 orbitals in n = 4 shells

Answer:

16

Explanation:

A 3.90L sample of gas at STP is cooled to -55oC at 808mmHg. What is the new volume?

Answers

Answer:

3.72L

Explanation:

Given parameters:

Initial volume V₁ = 3.9L

Condition  = STP

Final temperature T₂ = -550°C

Final pressure P₂  = 880mmHg

Unknown:

Final volume V₂  = ?

Solution.

At standard temperature and pressure(STP), the:

           Pressure  = 1atm   = 760mmHg

            Temperature  = 273K

Therefore, P₁  = 760mmHg

                  T₁  = 273K

The general gas law, is best to solve this problem. It is mathematically given as:

           (P_(1) V_(1) )/(T_(1) ) = (P_(2) V_(2) )/(T_(2) )

Let us take the units to the appropriate one;

      -550°C  = 273 + (-550) = -277K

Input the variables;

             (760 x 3.9)/(273) = (808 x V_(2) )/(-277)

        V₂  = 3.72L

           
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