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3 years ago

A gas company has the following rate schedule for natural gas usage in single-family residences:

Chemistry

1 answer:

zaharov [31]3 years ago

5 0

monthly service charge is flat. you have to pay it no matter how many therms you use.

since you've used only 25 therms, they'll charge you $0.6686/therm
so, total charge for using 25 therms in one month

= 8.8 + 25*0.6686=16.715+8.8 = 25.52

What is the charge for using 45 therms in one month?

45 = 25 + 20

so for first 25 therms they'll charge u .6686/therm, and rest of the 20 they'll charge u 0.85870/therm

8.8 + 25*.6686 + 20*.85870

25.52+17.174 = 42.694

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A chemistry student must write down in her lab notebook the concentration of a solution of sodium hydroxide. The concentration o

HACTEHA [7]

Answer:

1.099 gmL¯¹ ≈ 1.1 gmL¯¹

Explanation:

From the question given above, the following were obtained:

Mass of empty cylinder = 9.5 g

Mass Cylinder + NaOH = 31.92 g

Volume of solution = 20.4 mL

Concentration of solution =?

Next, we shall determine the mass of sodium hydroxide, NaOH. This can be obtained as as illustrated below:

Mass of empty cylinder = 9.5 g

Mass Cylinder + NaOH = 31.92 g

Mass of NaOH =?

Mass of NaOH = (Mass Cylinder + NaOH) – (Mass of empty cylinder)

Mass of NaOH = 31.92 – 9.5

Mass of NaOH = 22.42 g

Finally, we shall determine concentration of the solution as follow:

Mass of NaOH = 22.42 g

Volume of solution = 20.4 mL

Concentration of solution =?

Concentration = mass /volume

Concentration of solution = 22.42 / 20.4

Concentration of solution = 1.099 gmL¯¹ ≈ 1.1 gmL¯¹

Therefore, the concentration of the solution is 1.1 gmL¯¹

3 0

3 years ago

For a laboratory investigation some students put a strip of shiny metal into a beaker of blue solution and then stored the beake

KatRina [158]

Answer:

Explanation:

8 0

3 years ago

What is chemsity and what does it have to do with science

MatroZZZ [7]

Chemistry is the study of the composition of matter and the ways in which matter interacts, combines, and changes under certain conditions. Although not as fundamental as physics, chemistry is a very basic and broad science. It helps us explain bodily interactions and natural process (biochemistry), it helps us to manufacture new medications, and true chemistry research will always follow the scientific method.

4 0

3 years ago

A molecule of acetone and a molecule of propyl aldehyde are both made from 3 carbon atoms, 6 hydrogen atoms, and 1 oxygen atom.

TEA [102]

Explanation:

The structures of both acetone and propanal are shown below:

In the formula of propanal there is -CHO functional group at the end.

In acetone -CO- group is present in the middle that is on the second carbon.

The molecular formula is C3H6O.

Both have same molecular formula but different structural formulas.

7 0

2 years ago

Balance the equation

snow_lady [41]

Answer:

1:13:6:10

Explanation:

answer from VNese

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2 years ago