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Vilka [71]
2 years ago
15

Write the symbol for every chemical element that has atomic number greater than 8 and atomic mass less than 25.5 u.

Chemistry
1 answer:
timama [110]2 years ago
7 0

F  atomic number 9, mass 19

Ne  atomic number  10, mass 20

Na  atomic number 11, mass 23

Mg  atomic number 12, mass 24

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2 years ago
A science teacher has a supply of 50% sugar solution and a supply of 80% sugar solution. How much of each solution should the te
Monica [59]
You can establish a system of two equation with two variables.

Varibles are:
V1 = volume of the 50% sugar solution
V2 = volumen of the 80% sugar solution

Equations:
Balance of sugar:

Sugar from 50% solution: 0.5*V1
Sugar from 80% solution: 0.8*V2
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1) 0.5V1 + 0.8V2 = 63

Final volume = volume of 50% solution + volume of 80% solution

2) V1 + V2 = 105

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Substitue in (1)

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Answer: 70 mL of the 50% solution and 35 mL of the 80% solution.
5 0
3 years ago
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