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VMariaS [17]
3 years ago
13

What are the four rules for significant figures

Chemistry
1 answer:
kkurt [141]3 years ago
5 0

Answer:

Significant Figures

Explanation:

1) Annotation category: ...

2)RULES FOR SIGNIFICANT FIGURES.

3) All non-zero numbers ARE significant. ...

4)Zeros between two non-zero digits ARE significant. ...

5)Leading zeros are NOT significant. ...

6)Trailing zeros to the right of the decimal ARE significant. ...

7)Trailing zeros in a whole number with the decimal shown ARE significant.  8) to make you happy :) hope this helps you :)

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Why isn’t a state change from liquid to solid a chemical reaction?
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Answer:

nosé ehhhye eee p nosé inglés

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2 years ago
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A solution made by dissolving 33 mg of insulin in 6.5 mL of water has an osmotic pressure of 15.5 mmHg at 25°C. Calculate the mo
Liula [17]

<u>Answer:</u> The molar mass of the insulin is 6087.2 g/mol

<u>Explanation:</u>

To calculate the concentration of solute, we use the equation for osmotic pressure, which is:

\pi=iMRT

Or,

\pi=i\times \frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}\times RT

where,

\pi = osmotic pressure of the solution = 15.5 mmHg

i = Van't hoff factor = 1 (for non-electrolytes)

Mass of solute (insulin) = 33 mg = 0.033 g   (Conversion factor: 1 g = 1000 mg)

Volume of solution = 6.5 mL

R = Gas constant = 62.364\text{ L.mmHg }mol^{-1}K^{-1}

T = temperature of the solution = 25^oC=[273+25]=298K

Putting values in above equation, we get:

15.5mmHg=1\times \frac{0.033\times 1000}{\text{Molar mass of insulin}\times 6.5}\times 62.364\text{ L.mmHg }mol^{-1}K^{-1}\times 298K\\\\\text{molar mass of insulin}=\frac{1\times 0.033\times 1000\times 62.364\times 298}{15.5\times 6.5}=6087.2g/mol

Hence, the molar mass of the insulin is 6087.2 g/mol

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3 years ago
What reaction type is depicted by the following equation? 2C2H2 + 5O2 4CO2 + 2H2O decomposition combination combustion single-re
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combustion is when you burn something in presence e of oxygen and the products will be mainly the CO2 and H2O

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The octet rule states that atoms will gain, lose, or share valence electrons to get a full outer shell (orbital). Explain in you
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Answer:

In covalent bonding, the octet rule is important because sharing electrons gives both atoms a full valence shell. As a result, each atom can consider the shared electrons to be part of its own valence shell.

np :)

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Thermal energy always moves from a greater energy level to a lesser energy level
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Answer:

\fbox{Law -Based \: on \: laws \: of \: thermodynamic}

Explanation:

At constant pressure Thermal energy always moves from a greater energy level to a lesser energy level, laws of thermodynamics prove that.

Nature always likes to attain equilibrium either it's movement of heat energy or flow of water from higher region to lower region. The first and second law of thermodynamics are profe of that, the first law says that the total energy of universe is Constant. Energy can not be destroyed it always changes from one form to another, by work and heat. The second law explains why thermal energy moves from a greater energy level to a lesser energy level, it deals with the change in entropy of a system and surrounding and states heat flows from hot environment to cold environment.

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