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3 years ago

When barium becomes positively charged, it forms a(n): (2 points)

Chemistry

1 answer:

mart [117]3 years ago

3 0

Barium forms cation : Ba²⁺

<h3>Further explanation</h3>

Given

Barium element

Required

Ion type

Solution

Barium with the symbol Ba is an alkaline earth metal element having the atomic number 56

Electron configuration of Barium: [Xe] 6s2

If we look at this configuration, then Barium will try to achieve stability by removing 2 electrons so that the electron configuration is the same as the noble gas Xenon (Xe)

Because it removes 2 electrons, Barium has the number of protons> the number of electrons so that the charge is positive and forms a cation

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Why are Van der Waals forces important?

lilavasa [31]

Answer:

The answer is B.

Explanation:

They are the strongest type of inter-molecular force attractive forces that can act between atoms. This is why Vander Walls forces important.

7 0

3 years ago

I have a 270 g cup of coffee at 94.1 degrees Celsius. Assume that the specific heat of coffee is the same as pure water, 4.18 J/

natulia [17]

Answer:

90.64 degrees

Explanation:

Lets list out the parameters given in the question.

Mass of Cup = 270g

Temp. of cup = 94.1C

Specific heat capacity of C = 4.18J/gC

Temp. of Silver spoon = 26.8C

heat capacity of the silver spoon = 61.2 J/C

The fact that thermal equilibrium was mentioned simply means that;

Heat Lost by coffee= Heat gained by spoon

The relationship between the parameters mentioned is given as;

Q = m* c * dT

Where;

m is the mass, c is the specific heat capacity and dT is the "change" in temperature.

Assume the final temperature of the whole system is "x". They would both have the same final temperature since they are in thermal equilibrium.

Heat lost by coffee = 270 * 4.18 * (94.1 - x)

(94.1 -x) because coffee will loose heat, hence temperature of coffee will fall.

Heat gained by spoon = c *dT = 61.2 * (x - 26.8).

dT = Final Temp. - Initial Temp.

dT = x - 26.8

Heat lost = Heat gained :

270 * 4.18 * (94.1 - x) = 61.2 * (x - 26.8),

1128.6 (94.1 - x) = 61.2 (x- 26.8)

18.44 ( 94.1 - x) = x - 26.8

1735.2 - 18.44 x = x - 26.8

1735.2 + 26.8 = x + 18.44 x

1762 = 19.44 x

x = 90.64 degrees

8 0

3 years ago

To measure the amount of citric acid (C3 H, oHn a certain candy, an analytical chemist dissolves a 16.00 g sample of the candy i

Naily [24]

Answer:

Acid-Base reaction (the reactanct acting as a base is NaOH)

mass percent = 1.93%

Explanation:

The reaction that takes place is:

C₃H₅O(CO₂H)₃(aq) + 3OH⁻ (aq) → C₃H₅O(CO₂)₃⁻³(aq) + 3H₂O(l)

This is a <em>acid-base reaction</em>, with the citric acid acting as the acid and the <u>sodium hydroxide NaOH acting as the base.</u>

We <u>calculate the moles of citric acid</u> using the information from the titration:

0.0142 L * 0.340 M * $\frac{1molAcid}{3molOH^{-}}$ = 1.609x10⁻³ mol citric acid

Now we <u>convert moles to mass</u> using the acid's molecular weight (192.13g/mol):

1.609x10⁻³ mol citric acid * 192.13g/mol = 0.3092 g citric acid

Finally we calculate the mass percent of citric acid in the sample:

0.3092 g / 16.00 g * 100% = 1.93%

3 0

3 years ago

If substance A has a density of 2.3 g/mL and water has a density of 1.00 g/mL will substance A float or sink in water? Explain i

UkoKoshka [18]

Substance A will sink because it is more dense than water. An object that is more dense than water will sink and an object that is less dense than water will float.

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3 years ago

What does the speed of the mixing colors tell you about the speed of the

belka [17]

Since the colors moved faster in the hit water, it means that the water molecules in the hot water move faster than the molecules in the cold water.

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3 years ago