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3 years ago

2. On the periodic table, what is the difference between a group (or family) and a period?

Chemistry

2 answers:

alexgriva [62]3 years ago

8 0

Answer:

On the periodic table,periods are horizontal rows (across) the periodic table while groups are vertical columns (down) the table.We have groups in the periodic table like transition metals,rare earth,alkali metals ,alkaline earth metals halogens and noble gases

Eva8 [605]3 years ago

6 0

Answer:

Horizontal row call period and vertical column called group!

Physical,chemical, reaction procedure, shape,size, enthalpy of dissociation, bonding,non bonding, various things that segregated group and period....

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Waves move out through the ground from the source of an earthquake. True or false

diamong [38]

True would be the answer

3 0

4 years ago

Hydrogen sulfide is composed of two elements: hydrogen and sulfur. in an experiment, 6.500 g of hydrogen sulfide is fully decomp

LiRa [457]

Hydrogen sulfide = hidrogen + sulfur

6.500 g

a) 0.384 g + x

=> 6.500 = 0.384 + x => x = 6.500 - 0.384 = 6.116 g

Answer: 6.116 g of sulfur must be obtained

b) this experiment demonstrate the conservation of mass.

c) Dalton's atomic model states that the atoms cannot be created, split or be destroyed, and so in a chemical reaction the atoms rearrange but the number of each type of atoms remain constant, so the mass of each type of atoms and the total mass remain constant.

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4 years ago

You are running a calorimetry experiment where you are trying to determine the number of Calories (with a capital C!) in a peanu

balu736 [363]

Answer:

The number of calories of heat released by the peanut is $H =2655.12 \ Calories$

Explanation:

Now from the data given we can evaluate the mass of the peanut that is burnt as

$M_b = Initial \Mass \ of \ Peanut - Final\ Mass\ of\ Peanut$

Substituting values

$M_b = 3.11 - 0.52$

$= 2.59 g$

Generally the heat gained by the water can be mathematically represented as

$H = m_w c_w \Delta T$

Where $m_w$ is the mass of water which is given as $m_w = 55.2 g$

$c_w$ is the specific heat of water which has a constant value of $c_w = 1 cal / g ^oC$

Now is $\Delta T$ is the change in temperature which can be evaluated as follows $\Delta T = Final\ Temp\ of\ Water - Initial\ Temp\ of\ Water = 71.3 - 23.2 = 48.1^oC$

Now

$H = 55.2 * 1 * 48.1$

$H =2655.12 \ Calories$

8 0

3 years ago

A sample of gas initially occupies 4.25 L at a pressure of 0.850 atm at 23.0°C. What will the volume be if the temperature is ch

Akimi4 [234]

Answer:

$2.31\text{ L}$

Explanation:

Here, we want to calculate the final volume

We use the general gas equation here:

$\frac{P_1V_1}{T_1}\text{ = }\frac{P_2V_2}{T_2}$

P1 is the initial pressure which is 0.850 atm

V1 is the initial volume which is 4.25 L

T1 is the initial temperature which is (23 + 273.15 = 296.15 K)

P2 is the final pressure which is 1.50 atm

V2 is the final volume which is unknown

T2 is the final temperature (11.5 + 273.15 = 284.65 K)

Substituting the values, we have:

$\begin{gathered} \frac{0.850\text{ }\times4.25}{296.15}\text{ = }\frac{1.50\times V_2}{284.65} \\ \\ V_2\text{ = }\frac{284.65\text{ }\times0.850\times4.25}{1.5\times296.15} \\ \\ V_2\text{ = 2.31 L} \end{gathered}$

6 0

2 years ago

Explain the geometry of PCl5 molecule and account for its high reactivity

Nesterboy [21]

Answer:

In PCl5, in addition to equitorial bonds which lie in the same plane ,there are axial bonds. Since it suffers more repulsion it is longer than the other bonds. Also these are weak bondsand therefore these bonds can break easily . Because of these reasons,PCl5 is very reactive.

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3 years ago