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2 years ago

The __ _ is the outer part of the atom?

1 answer:

3 0

Possibly electron shells, the electrons in the outermost occupied shell (or shells) determine the chemical properties of the atom..

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The electron dot diagram for a neutral atom of chlorine (atomic number 17) is shown below.

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The answer is B ! Hoped I helped!

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2 years ago

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What is the percent by mass of potassium in K3Fe(CN)6?

yawa3891 [41]

The percent by mass of potassium in K3Fe(CN)6 is 35.62%.

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3 years ago

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dybincka [34]

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C) There are fewer particles in the balloons than were in the cylinder.

Explanation:

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2 years ago

A titration is performed on a 25.0 mL sample of calcium hydroxide. A volume of

slamgirl [31]

Answer:

$\boxed {\boxed {\sf 0.28 \ M}}$

Explanation:

Titration is a method used to determine the concentration of a substance. The formula for this is:

$M_AV_A= M_BV_B$

Where M is the molarity of the acid or base and V is the volume of the acid or base.

We know that 46.0 milliliters of a 0.15 molar solution of nitric acid wereused in the titration. 25.0 milliliters of solution of calcium hydroxide of unknown molarity were also used.

$\bullet \ M_A= 0.15 \ M \\\bullet \ V_A= 46.0 \ mL\\\bullet \ V_B= 25.0 \ mL$

Substitute these known values into the formula.

$0.15 \ M * 46.0 \ mL= M_B * 25.0 \ mL$

We are solving for the molarity of the base, so we must isolate the variable $M_B$ . It is being multiplied by 25.0 milliliters. The inverse operation of multiplication is division, so we divide both sides of the equation by 25.0 mL.

$\frac {0.15 \ M * 46.0 \ mL}{25.0 \ mL}= \frac{M_B * 25.0 \ mL}{25.0 \ mL}$

$\frac {0.15 \ M * 46.0 \ mL}{25.0 \ mL}= M_B$

The units of milliliters (mL) cancel.

$\frac {0.15 \ M * 46.0 }{25.0}=M_B$

$\frac {6.9}{25.0 } \ M =M_B$

$0.276 \ M = M_B$

The original measurements have 2 or 3 significant figures. We always round our answer to the least number of sig figs, which is 2. For the number we calculated, that is the hundredths place. The 6 in the thousandths place tells us to round the 7 up to an 8.

$0.28 \ M \approx M_B$

The concentration of calcium hydroxide is approximately 0.28 M.

6 0

2 years ago

How did Becquerel’s work lead to the discovery of two new elements?

cestrela7 [59]

Becquerel discovered radioactivity by accident while studying a mineral containing uranium. He observed that with exposure to sunlight the mineral gave off a penetrating energy that exposed the film. While one day he tried the experiment one day the day was cloudy so he put it away in a dark dresser drawer and at the next day he found the picture of the mineral and later found out that the mineral did not need sunlight to expose radiation so he gave it to two young researchers that eventually isolated the two elements named polonium and radium.

4 0

2 years ago

The ____________ ___________ is the outer part of the atom?

The __ _ is the outer part of the atom?