Which group of elements is the most unreactive? Why?

Answers

Answer 1

Answer: Noble Gases because the valence electron shell, or orbital, is complete. They are "happy" with their electrons and don't need to react with others to change.

Answer 2

Answer: Noble gasses. The already have 8 electrons in their outermost shell

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What ion is present in all acid solutions?

Answers

Hydrogen is present in all acid solutions

Answer:

Ion are protons

Explanation:

This runner completed a 100 meter race with a time of 13.75 seconds. what was her average speed

Answers

Taking into account the definition of speed, you get that the average speed of the runner is 7.27 $(m)/(s)$ .

It is necessary to know that speed is a physical quantity that expresses the relationship between the space traveled by an object and the time used for it.

In other words, speed can be defined as the amount of space traveled per unit of time with which a body moves and can be calculated using the expression:

$Speed= (distance traveled)/(time)$

In this case:

distance traveled= 100 meters
time= 13.75 seconds

Replacing these values in the speed definition:

$Speed= (100 m)/(13.75 s)$

Solving:

Speed= 7.27 $(m)/(s)$

In summary, the average speed of the runner is 7.27 $(m)/(s)$ .

Learn more about average speed:

Answer: 7.27 m/s

Explanation: The average speed of an object in an interval of time is the distance traveled by the object divided by the duration of the interval.

Distance traveled= 100 m

Time taken = 13.75 s

Average speed= $\frac{\text {distance traveled}}{\text {Time taken}}$

Average speed= $(100m)/(13.75s)=7.27m/s$

The cell theory states that all new cells come from other cells. How do unicellular organisms reproduce? How is it different from how multi-cellular organisms increase?

Answers

the cell theory states that all new cells come from other living cells, and it's true for both multicellular as well as unicellular organisms.unicellular organisms reproduce through asexual reproduction,There are different types of reproduction like binary fission, vegetative, budding, fragmentation etc reproduction in unicellular organisms, through that they directly divide into new similar cells.

whiltin multicellular organisms, reproduction takes place through sexual reproduction, where male and female gametes are formed in separate reproductive organs and get transferred to form an embryo.

so in nut cell in unicellular organisms there is no specific organs,that is responsible for reproduction, while in multicellular there coplex reproductive system

Valuable ore deposits and gem crystals are often associated with _____.

a. oceans

b.oil deposits

c. thin crustal areas

d. igneous intrusions

Which of the following shows a possible sequence that leads to the formation of sedimentary rocks?

a. squeezing, heating, bending, folding

b. rising, weathering, erosion

c. weathering deposition, compaction, cementation

d. melting, cooling, crystallization

PLZ HELP!! :)

Answers

For the first question:
Valuable ore deposits and gem crystals are often associated with igneous intrusions. So for this question the correct option is option “d”. An example like the Pegmatite’s, which are a form of igneous intrusions, is responsible for the creation of variety of gems like topaz and tourmaline.
For the second question:
For this specific question, option “c” seems to be the correct option. Weathering, deposition, compaction, cementation are the possible sequence that leads to the formation of sedimentary rocks.

Valuable ore deposits and gem crystals are often associated with igneous intrusions and The possible sequence that leads to the formation of sedimentary rocks is weathering, deposition, compaction, cementation. Thus, the correct options are option D and C.

Sedimentary rocks are types of rocks that are formed through the accumulation and lithification (compaction and cementation) of sediment particles. Sediments can include fragments of rocks, minerals, organic material, and other debris that are transported and deposited by water, wind, ice, or gravity.

Over time, these sediments undergo compaction and cementation processes, where the particles are pressed together and bound by minerals, creating solid rock formations. Sedimentary rocks often exhibit distinct layers or stratification, and they can contain fossils and provide valuable information about Earth's history and past environments.

Examples of sedimentary rocks include sandstone, limestone, shale, and conglomerate.

Learn more about Sedimentary rocks, here:

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What type of bond is methane?

Answers

It has 1 carbon atom and 4 hydrogen atoms, it is also know as a saturated chemical due to all bonds being used.

Find the ΔH for the reaction below, given the following reactions and subsequent ΔH values: PCl5(g) → PCl3(g) + Cl2(g) P4(s) + 6Cl2(g) → 4PCl3(g) ΔH = -2439 kJ
4PCl5(g) → P4(s) + 10Cl 2(g) ΔH = 3438 kJ

Answers

The value of ΔH will be 249.75 KJ.

To obtain the reaction :

PCl5(g) → PCl3(g) + Cl2(g)

We have to add the given reactions and then divide it by 4.

(i) adding the reactions

P4(s) + 6Cl2(g) → 4PCl3(g) ΔH = -2439 kJ

4PCl5(g) → P4(s) + 10Cl 2(g) ΔH = 3438 kJ

we get:

4PCl5(g) → 4PCl3(g) + 4Cl2(g), ΔH = 3438 - 2439

(ii) dviding by 4

PCl5(g) → PCl3(g) + Cl2(g) , ΔH = (3438 - 2439)/4

ΔH = 249.75 kJ is the required enthapy.

Learn more about enthalpy:

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Answer:

The value of $\Delta H$ for the desired reaction will be 249.75 KJ.

Explanation:

The desired reaction is shown below

$\textrm{PCl}_(5)\left ( g \right )\rightarrow \textrm{PCl}_(3)\left ( g \right )+\textrm{Cl}_(2)\left ( g \right )$

The desired reaction can be obtained by adding the given reactions and then dividing both sides by 4.

$P_(4)\left ( s \right )+6Cl_(2)\left ( g \right )\rightarrow 4PCl_(3)\left ( g \right ) \n4PCl_(5)\left ( g \right )\rightarrow P_(4)\left ( s \right )+10Cl_(2)\left ( g \right )$

Net Enthalpy change for the desired reaction

$\displaystyle (3438-2439)/(4) \textrm{ KJ} = 249.75 \textrm{ KJ}$

$\Delta H = 249.75 \textrm{ KJ}$

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