# matter interactions unit test

Which element has the same number of valence electrons as bromine (Br)?

1.krypton
2.potassium
3.selenium**
4.chlorine

i think the answer is SE

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1. also please dont make fun of my name :(

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2. bromine is one of the halogens ... like chlorine

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3. Se is not correct. Look at R Scott's response.

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4. Chlorine

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5. what are the ansers plsss hellllpppp pls

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1. chlorine (Cl)
2. They have similar reactivity.
3. It is a physical change because there is no reaction.
4. They form new substances.
5. it shows that no atoms have been gained or lost during the reaction
6. Find the mass of a piece of ice. Let the ice melt. Find the mass of the liquid water.
7. six
8.H2O
9. (Some Ideas)
- Matter is neither created nor destroyed. Therefore, you have started with 12.7 g Cu and 3.2 g S on the left for a total of 15.9 g; therefore, you must obtain 15.9 g of product(s). If Cu2S is the only product there must be 15.9 g Cu2S.
- The way to calculate this is by simply weighing the reactants as the mass of the reactants and product(s) will be the same.
- The answer is The Conversation of Mass Law. Basically what it means is that matter can’t be created or destroyed, this can be proven by the fact that 12.7 + 3.2 = 15.9

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7. and don't forget, keep gaming 😎

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8. UnknownGmr is 100% correct trust me

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9. Unknown gamer is correct for connections academy's Matter Interactions 8th-grade test ( unit 6 lesson 14 ) for all the questions after 2. The first 2 questions answers are-

1. Cobalt has a mass number of 59 and an atomic number of 27. A student wants to create a model of a cobalt atom. Which statement about the model is correct? ( 1 point )

The model should show 27 protons and 32 neutrons. -

2. In a molecule of lithium sulfide, there are two atoms of lithium and one atom of sulfur. Which statement about lithium sulfide is correct? ( 1 point )

The atoms in lithium sulfide are held together by bonds. -

Good luck!

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10. Thanks So Much Unknown Gmr
You were 100% correct

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11. UnknownGmr is 100% right thanks!

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1. a
2. b
3. a
4. c
6. c

hope this helped>

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13. Do not use people's responses that are letters! They mix up our answers!

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14. @UnknownGmr Is 100% right! I left the last question blank cause I'm behind and in a rush to finish before the semester ends(and it takes me 9 million years to fill-out the typing answers) so I'm gonna get 8/10, but all of their answers are correct!!

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15. THANK YOU SO MUCH!!!!

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16. GAME ON GAMERS UKNOWNGMR IS RIGHT

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17. Game on gamers, that’s all i gotta say. Shoutout to the homie “unknowngmr” for helping me with the first few questions. <3 (*´-`) stay safe guys
(P.S. trans rights)

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18. yeah...i dont think so

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