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Ugo [173]
2 years ago
9

Hydrogen and oxygen combining to form water is an example of a physical change.

Chemistry
1 answer:
amid [387]2 years ago
7 0
In a physical change, the makeup of matter is changed. Evaporation occurs when liquid water changes into a gas. ... Combining hydrogen and oxygen to make water is a physical change.
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A chemist must dilute 34.3mL of 1.72mM aqueous calcium sulfate solution until the concentration falls to 1.00mM. He'll do this b
EastWind [94]

Answer:

58.9mL

Explanation:

Given parameters:

Initial volume  = 34.3mL    = 0.0343dm³

Initial concentration  = 1.72mM   = 1.72 x 10⁻³moldm⁻³

Final concentration  = 1.00mM = 1 x 10⁻³ moldm⁻³

Unknown:

Final volume  =?

Solution:

Often times, the concentration of a standard solution may have to be diluted to a lower one by adding distilled water. To find the find the final volume, we must recognize that the number of moles of the substance in initial and final solutions are the same.

   Therefore;

              C₁V₁  =  C₂V₂

where C and V are concentration and 1 and 2 are initial and final states.

        now input the variables;

                      1.72 x 10⁻³ x  0.0343 = 1 x 10⁻³  x V₂

                        V₂ = 0.0589dm³ = 58.9mL

         

4 0
3 years ago
How many liters of 4 M solution can be made using 100 grams of lithium bromide?
Misha Larkins [42]
Add 450 million grams to the solution
7 0
3 years ago
Identify the formula for an alkene.
ioda

Answer:

CnH2n-2

im pretty sure thats the answer

5 0
2 years ago
Which metals are called noble metals
Diano4ka-milaya [45]

I don't know if this is multiple choice but if it isn't I can name of few.

Fun Fact: Noble Metals are chemical elements that have outstanding tolerance and resistance to oxidation.

Answer: Palladium, Silver, Platinum, and Gold. Those are all examples of Noble Metals.

Other: Ruthenium, osmium, and rhodium.

<em>Hope this helps!</em>

6 0
3 years ago
_______A representative element in the fourth period that is an alkaline earth
MariettaO [177]

Answer:calcium

Explanation: calcium is an alkaline earth metal,group 2 period 4

4 0
3 years ago
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