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3 years ago

(35 POINTSSSS)help plzzz do as much as u can

Chemistry

1 answer:

grigory [225]3 years ago

5 0

Answer:

the required anions and cations are :

<h3> cation / anion</h3>

Al 3+ / Cl -
Al 3+ / PO3-
Be 2+ / I -
Sr 2+ / F -
K + / N 3-
Na + / S 2-
Ca 2+ / Cl -
Na + / Br2-
Mg 2+ / S 2-
Al 3+ / O 2-
Li + / P 3-
Cs + / N 3-
K + / I -

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5. Which of the following correctly shows alpha decay?

lorasvet [3.4K]

Answer:

U --> Th + He

Explanation:

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. Which is also called helium nuclei. When atom undergoes the alpha emission the original atom convert into the atom having mass number less than 4 and atomic number less than 2 as compared to parent atom the starting atom.

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

₉₂U²³⁸ → ₉₀Th²³⁴ + ₂He⁴

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4 years ago

What is the Bohr model for Sodium?

Sonbull [250]

Column tells you how many valence electrons there are

Row tells you how many layers (circles)

Sodium (Na) has 1 valence electron

Sodium (Na) is the 3rd row so there's 3 circles

Has 11 total electrons

Bohr models show ALL ELECTRONS

The first shell can only hold 2 electrons

Every shell after that can hold 8.

So the first shell has 2 electrons, second one has 8 electrons, and the third one has 1.

2 + 8 + 1 = 11

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3 years ago

Why do you think the bird is included in phylum Chordata but not in class Mammalia

Elis [28]

Answer:

Birds are a member of the phylum Chordata and the subphylum Vertebrata, which means they have vertebrae. They are not mammals because they lay eggs.

Explanation: Hope it helped!

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3 years ago

Describe briefly a chemical test to identify a sample of each of the following gases in the laboratory. For each test include a

Furkat [3]

Answer:

Am I the bad guy for killing my fish, let me explain?

Explanation:

The fish said a bad word that was incredibly inappropriate, so then I told him to never say that again. He responds with, "No, I CAN SAY WHATEVER I WANT." After that I told him to not yell at me and then I killed him, remember he's a fish (GoldFISH).

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2 years ago

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Answer:

The major social sciences are:

Anthropology.

Economics & Management.

History.

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Sociology

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3 years ago