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3 years ago

What is an open system?

Chemistry

2 answers:

Crank3 years ago

7 0

Answer:

open system

Learn to pronounce

noun

noun: open system; plural noun: open systems

Computing

a system in which the components and protocols conform to standards independent of a particular supplier.

Physics

a material system in which mass or energy can be lost to or gained from the environment

Explanation:

tresset_1 [31]3 years ago

5 0

Explanation:

a material system in which mass or energy can be lost to or gained from the environment.

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How is a lithium atom (Li) different from a lithium ion (Li+)?

sdas [7]

Li has fewer electrons than Li+ (protons can't change)

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3 years ago

Read 2 more answers

A sample of a given compound contains 13.18g of carbon and 3.32g of hydrogen. What is the percent composition of the compound?

GarryVolchara [31]

The percent composition of the compound is 79.87 % of carbon and 20.12% of hydrogen

Explanation:

Given:

mass of carbon = 13.18 grams

mass of hydrogen = 3.32 grams

percent composition of compound =?

From the given data total mass of the compound is calculated

13.8 + 3.32

= 16.5 grams

The individual percentage of hydrogen and carbon will be calculated as:

percent composition = $\frac{individual mass of the element}{total mass of the compound}$ x 100

For carbon,

$\frac{13.18}{16.5}$ x 100

percent composition of carbon = 79.87 % of carbon.

for hydrogen:

$\frac{3.32}{16.5}$

= 20.12 % of hydrogen

In the compound given 79.87 % of carbon and 20.12% of hydrogen is present.

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4 years ago

what do you predict will happen a crystal of potassium nitrate is added to the saturated solution as it is cooled

myrzilka [38]

The solution forms bigger crystals that have pointed ends.

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3 years ago

The product(s) of a heated reaction of N,N-ethylmethylpentanamide with sodium hydroxide would be __________. View Available Hint

nikitadnepr [17]

Answer:

sodium pentanoate and ethylmethylamine

Explanation:

The reaction of N,N-ethylmethylpentanamide with sodium hydroxide involves an amide and an inorganic hydroxide.

The CO-N bond is highly polar hence the -N(C2H5) (CH3) moiety is easily lost and replaced by the -ONa leading to the formation of sodium pentanoate.

The H^+ combines with -N(C2H5) (CH3) to yield ethylmethylamine

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3 years ago

can someone help me with these? I just started chemistry this semester, and since it's involving math I don't see myself doing g

V125BC [204]

Any non zero digits are significant. (120 has 2 sig figs)

Zeroes between significant digits are significant. (103 has 3 sig figs)

Zeroes only count if there is a decimal point and if they are following a significant digit. (.600 has 3 sig figs; .067 has 2 sig figs)

1) 1278.50 = 6 sig figs

2) 120000 = 2 sig figs

3) 90027.00 = 7 sig figs

4) 0.0053567 = 5 sig figs

5) 670 = 2 sig figs

6) 0.00730 = 3 sig figs

That's all I'm gonna do so yeah.

Now for the rounding, it's basically rounding but it must have the x amount of sig figs after rounding. It's pretty hard to explain.

19, I'm not really sure. Might be 120 with a decimal point at the end.

20) 5.457, alright so here, since we are rounding to three significant digits, we look at the third sig fig. The third sig fig here would be 5. Then we just round. Since the number next to 5 is 7, we round 5 up to 6.

So 5.457 rounded to 3 sig figs would be 5.46

21) 0.0008769, the third sig fig here would be 6. You round 6 up to 7 because the number next to it is 9.

So 0.0008769 rounded to 3 sig figs would be 0.000877

So I hope you get it, I'm gonna let you do the rest.

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2 years ago