Lightning rods are mounted on top of tall structures to protect them during thunderstorms. If lightning strikes, it will hit the rod and be directed to the ground through a wire, instead of passing through the structure. What type of substance should be used to make a lightning rod, and why?

Why can physical changes separate the components of a mixture but not the components of a compound?

Several types of mixtures can be separated by physical means. Heterogeneous mixtures imply the different parts are not equally distributed, much like how on a pizza the toppings are not located in the crust. A homogeneous mixture is one where the components are equally mixed, such as orange juice or lemonade (excluding the pulp).

A common heterogeneous example is to separate oil from water by placing the mixture into a separation funnel and draining one level of liquid out. You then have the two separate components. Basically, if you can see the different layers in a mixture, you can physically remove them by either picking out the solids (either with your hands or running the mixture through filter paper) or for liquids using the funnel.

We have that for the Question "how many atoms are in Na2CrO4" it can be said that The total number of atoms is

• X=7 atoms

From the question we are told

how many atoms are in Na2CrO4

Generally

In identifying the  atoms are in Na2CrO4 we must first look closely at the compound   Na2CrO4

We have

Na=1

Cr=2

O=4

Therefore

The total number of atoms is

X=1+2+4

X=7 atoms

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Final answer:

The tail of a comet always points away from the Sun.

Explanation:

The tail of a comet always points away from the Sun. This is due to the interaction between the Sun's radiation and the comet's gas and dust particles. As the comet gets closer to the Sun, the solar radiation causes the ice within the comet to vaporize and release gas and dust particles, forming a glowing tail that always faces away from the Sun.

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Answer:

The amount of sugar that can dissolve in water increase .

Explanation:

• Energy, which is the capacity to do work or produce heat, affects the rate at which a solute will dissolve.
• Breaking up, crushing or grinding a sugar cube before adding it to water increases the sugar's surface area.
• The more surface area a solute has, the faster it will dissolve because more particles of the sugar can interact with the water.
• This means the finer the sugar particles, the faster it will dissolve.
• The sugar in the middle of a sugar cube is protected from the water by the sugar in the outer layers of the cube; the water has to go through those outer layers first.
• But if you crush the cube into a powder, all of the sugar is exposed to the water at once.

Explanation:

1. Tear gas, might shoot at protesters, may hit unsuspecting innocent bystander.

2 Hostage situation with armed subject  who has child as hostage.

3.  Raiding a house or location with armed suspect in vicinity or area who could possibly