Echoderms contain a what similar to the kind that vertebrates have

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Answer 1
Answer: Echinoderms contain internal skeletons similar to the kind that vertebrates have. This internal skeleton is made up of calcium carbonate. They are marine animals. Some species of the echinoderm phylum include starfish, sea cucumbers and sea urchins. 

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There is a toxic poison gas in the air made of chlorine, argon, and rheniumWho made the poison gasA. ClarreB.NathanC. Felex
Given the reaction below, which is the reduced substance?Mg + Cl2 Right arrow. Mg2+ + 2Cl- 2CI- CI2 Mg Mg2+
Which of the following is an example of a chemical change? A. melting solid gold B. burning hydrogen gas C. breaking a sheet of glass D. dissolving sugar in water
If a chemical change has taken place, which of these is most likely true? A. Original substance can be easily recovered.B. Composition of a substance is the same.C. A completely new substance is formed.D. An easily reversible process has taken place.
Sodium(na) is a highly reactive metal and chlorine is a poisonous gas. Which compound do they form when they chemically combine?

I have a balloon that can hold 100 liters of air. If I blow up this balloon with 3 miles of gas at a pressure of 1 atmosphere, what is the temperature of the balloon

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Answer:

99

Explanation:

Because if u ask me it has to be

Which term describes matter that is a substance made of diffrent kinds of atoms bonded together

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Compounds are substances made of at least 2 different elements. Molecules have at least 2 atoms, doesn't have to be different elements. Compounds and molecules both work.

Define chemical change and give an example

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Definition-A formation of new chemical substances.
Example- Sugar undergoes a chemical change when it is cooked to make caramel. :3

Hope I helped! Sorry if it's bad.
Chemical changes are the chemical properties associated with a specific matter. 

Examples include toxicity, reactivity, stability, flammability, etc. 

The p subshell can hold up to eight electrons in an atom (2 points)
True or false?

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Answer: The statement is false

Explanation:

Electrons occupy a region in atoms known as orbitals or subs hell.  These orbitals include

I) S-orbital: it can occupy a maximum of two electrons

II) P-orbital: It occupies a maximum of six electrons

III) D-orbital: it occupies a maximum of ten electrons

F and G-orbitals as examples of other orbitals present.

A good illustration of the 6 electrons occupied by the P-subshell is seen in Sodium (Na) with atomic number of 11

Na = 1s2, 2S2 2p6, 3s1

Note: extra electrons are transferred to the next orbital

Answer: This statement is false!!

Explanation: the p sub-shell can hold a max of 6 and the d sub-shell can hold a max of 10

If stomach acid has a ph of 1.3, what is the pOH

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I think the answer is -12.7

when you open a solid room air freshener, the solid slowly loses mass and volume. how do you think this happens?

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The solid particles inside the air freshener undergo sublimation and becomes gas. This gas is spraying out and thus the mass and volume inside reduces.

What is sublimation?

Sublimation is the process of conversion of solid particles into gas phase and vice-versa. The particles in solid phase are closely packed and they cant move apart.

Particles in gaseous are free to move and spread in the atmosphere. To weaken the intermolecular force in the solid particles to convert them to gas, energy need to be applied.

Particles inside the freshener container gains enough energy to directly form their gas phase. This gas can easily move out as spray and the sprayed mass is lost from the solid.

Find more on sublimation:

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The fumes of the air freshener might be leaking out