CHEMISTRY MIDDLE SCHOOL

Which of the following statements is true?1. Dalton believed atoms were made mostly of empty space.
2. Plasmas have a net negative charge.
3. The number of protons in an element is always equal to the number of neutrons.
4. Solids have a fixed mass, volume, and shape.

Answers

Answer 1
Answer:

Answer:  Solids have a fixed mass, volume, and shape.

Explanation:  Solids are the substances which have fixed shape, fixed volume and mass due to its close packed structure.

Dalton explained that all the elements are made up of small indivisible particle known as Atoms but after some time this was proved wrong as atoms is not indivisble, it conatins sub atomic particle like electrons, protons, neutrons etc.

Plasmas are considered as the fourth state of matter which contains equal quantity of positive ions and negative electrons.

The number of protons are equal to the number of electrons. The sum of number of protons and neutrons make the atomic mass quantity.
Answer 2
Answer: solids have a mixed mass, volume, and shape.

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Answer:The solubility of oxygen and other gases will decrease as temperature increases 9. This means that colder lakes and streams can hold more dissolved oxygen than warmer waters. If water is too warm, it will not hold enough oxygen for aquatic organisms to survive.

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Examples of a cell wall

Answers

✡ Answer: A example of this is a wall surrounding fungi (a cell wall)✡


- - Why?
Because this is a good example of a cell wall, and it is commonly used in most science lessons (in  my school atleast)



✡Hope this helps✡


a gate protecting the house inside 

Which geologic era lasted the longest?A) The Cenozoic
B) The Mesozoic
C) The Paleozoic
D) The Precambrian

Answers

Your answer is going to be d.

How many valence electrons does lithium (Li) have available for bonding? 1 2 3 4

Answers

The number of valence electrons that Lithium has for chemical bonding would be 1. According to the electron configuration of lithium, 1s^2 2s^1. This single valence electron is found in the 2s orbital of the 2nd energy level.

Answer:

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Explanation:

What must occur before clouds can form?

Answers

Condensation must occur.
condensation of water vapor also the water vapor must lose heat energy

What do solutions and colloids have in common

Answers

well ... there are sm common things between solutions and colloids

solutions even and fully mixed together and so are colloids

when we let solutions and colloids settle down both of them do not have boundaries ... the particles of colloids and solutions do not settle down

Both are liquids. Both will pass through filters without seperation.

You can see through a solution, as the ions of the solute are dissolved. A colloid is a suspension of insoluble ultra microscopic particles or large molecules in water or other liquid, kept in suspension by Brownian motion.
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