CHEMISTRY MIDDLE SCHOOL

CAN ANYONE ANSWER THIS PLZZZ ?!?

Answers

Answer 1

Answer:

Answer:you need to write the equation of the reactions in each question.

you need to calculate the mol for each substance which mass for which mass is given

then you do mol ratio.

I hope this shows you a hint and helps you not to depend completely on brainly.

plz put me as Brainliest

Explanation:

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An empty party balloon will float to the ceiling of a room once it is filled with helium.A. What does this tell you about the density of air in the room compared to the density of helium?

B. For the balloon to float in air, what two factors might have changed about the balloon?

Answer those two questions of you know the answer.

Answers

Helium is a gas composed of itself, were air is composed of Oxygen and Nitrogen making the air more dense than the helium making it float to find other gases

Two factors to change are Air pressure (due to the balloon moving ) and the helium making the balloon rise.

That's about all I can explain...hope this helps >.<

Please help me. Chemistry

Answers

Answer:

element S is argon and element T is potassium.

4. B

5. D

Explanation:

in an element in periodic table number of elctrons and protons are same.

4. since element S has 18 protons so its atomic number must be 18 so the element is Argon which is the last element of period 4 so the next element will go to period 4 with one extra shell and since the atomic number of next element is 19 the element is Potassium. therefore T is Potassium.

5. number of nucleons in an atom is the number of protons and neutons combined together in an nucleus

How are elements arranged on the periodic table

Answers

The elements on the periodic table are arranged by their atomic number (amount of protons). They are also arranged so that the elements with similar properties are arranged next to each other.

hey are arranged according to proton amount

Stirring a liquid while you are mixing in another ingredient speeds up the rate of dissolving. Question 13 options: True False

Answers

Answer:

true

Explanation:

This is because it helps distribute the particles that are being dissolved.

The answer would be true

How do the particles that are dispersed in a colloid differ from the particles suspended in a suspension?The colloid particles are less dense.

The colloid particles are more solid.

The colloid particles are smaller.

The colloid particles are larger.

Answers

Answer: The correct option is that the colloid particles are smaller.

Explanation: There are 3 types of solutions:

1) True solutions: These are the solutions in which the size of the particles are less than 1nm. These are considered as homogeneous mixtures.

2) Colloids: These solutions are the solutions in which the size of the particles lie in the range of 100nm to 1nm. These are assumed to be homogeneous mixtures but actually are heterogeneous mixtures.

3) Suspension: These solutions are the solutions in which the size of the particles are greater than 100 nm. These are considered as homogeneous mixtures.

The particles which are dispersed in a colloid have smaller particles than the particles which are dispersed in a suspension.

What are some facts about covalent bonding?I need some information for my chemistry poster please, thank you.

Answers

When two atoms come near each other, sometimes they stick together to make a molecule. One way they can stick together is by covalent bonding.In covalent bonding, the atoms are unstable because their outer rings of electrons aren't filled up. By sharing electrons with other atoms, these atoms can fill up their outer rings and become stable. In water, for instance, the oxygen atom needs two more electrons to be stable, and the hydrogenatoms each need one. When they get together, the oxygen atom shares oneelectron with each of the hydrogen atoms, and the hydrogen atoms eachshare one electron with the oxygen atom.Now that the atoms have become stable, it's pretty hard to knockthem back into being unstable again, so covalent bonds are strong andmolecules that form with covalent (sharing) bonds are strong molecules.Covalent bonding makes very strong connections between the atoms,so it's hard to break these molecules apart. On the other hand,molecules that join with covalent bonds aren't very much attracted toeach other (unlike with ionic bonding), so they move freely around eachother. That means that most molecules that form covalent bonds makeeither liquids or gases, like water and carbon dioxide. The main exception is metals,which hold together using covalent bonding but are still solids. That'swhy metals are so flexible and easy to melt so you can make them intodifferent shapes.

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