What happens to metal railroad tracks during the heat of a summer day?

Answers

Answer 1

Answer: They expand and that is why there are small gaps

Answer 2

Answer: The rails expand during the heat of a summer day

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Could a mixture be made up of only elements and no compounds? explain.

Answers

yes , because all elements are made of atoms and elements are the building blocks of the universe because everything is made of elements, therefore all matter is made up of atoms and compounds are made of elements, which are made up of atoms sooooo yes you can only make a mixture with elements and compounds

How does Silicon shape our technological reality

Answers

Silicon shapes our technological reality because computer chips are made out of silicon. Different computer parts, are made out of silicon chips, tablets, phones, different electronic devices, everything has some silicon in them. Without silicon we would (currently) not have any of those. That is how silicon shapes our technological reality :)

The silicon uses in :

1- Micro-chips.

2- Motherboards

3- components on nano-technologies

4- tablet

5- Phones

The explanation:

- When the silicon incorporated into electronics, They are termed as silicon wafers. It is used as a semiconductor.

- And when it combined with the other conductors this process called doping and become ideal to make transistors and be able to amplify electric signals.

That's how Silicon shape our technological reality.

the atomic number of barium is 56 what do you know about the subatomic particles in an atom of this element

Answers

Answer is 56 protons and 56 electrons.

Explanation;

Atomic number is equal to number of protons. Hence, when the atomic number is 56, it means that atom has 56 protons.

When the element is in neutral state,number of protons = number of electrons. Hence, we can say that barium atom has 56 electrons.

But same element can have different number of neutrons. Those are called isotopes. Hence, we cannot say that there are 56 neutrons in barium atom without having its mass number. (Mass number = number of protons + number of neutrons)

If this atom is a neutral atom, the subatomic particles would be 56 protons, 56 neutrons, and 56 electrons.

Jermey has two plants. he waters both equally. he puts one plant outside. he puts another plant in a closet which one is true about the plants?
A. the plant in closet will die.
B. plants only need soil to grow.
c. plants only need water to grow.
d.it does not matter where he puts the plant.