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3 years ago

4. What threatens the health of coral reefs? (Select all that apply.)

Chemistry

2 answers:

Tanzania [10]3 years ago

8 0

Answer:

Explanation:

1,2,3

shusha [124]3 years ago

7 0

I would say ocean water pollution... forgive me if I’m wrong.

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Write the empirical formula of at least four binary ionic compounds that could be formed from the following ions:

KATRIN_1 [288]

Answer: $MgS$ , $MgBr_2$ , $V_2S_5$ and $VBr_5$ are four binary ionic compounds that could be formed.

Explanation:

For formation of a neutral ionic compound, the charges on cation and anion must be balanced. The cation is formed by loss of electrons by metals and anions are formed by gain of electrons by non metals.

Mg is having an oxidation state of +2 called as $Mg^{2+}$ cation and $S^{2-}$ is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $MgS$ . Also $Mg^{2+}$ cation and $Br^{-}$ can combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $MgBr_2$ .

Also Vanadium is having an oxidation state of +5 called as $V^{5+}$ cation and $S^{2-}$ is an anion with oxidation state of -2. Thus they combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $V_2S_5$ . Also $V^{5+}$ cation and $Br^{-}$ anion can combine and their oxidation states are exchanged and written in simplest whole number ratios to give neutral $VBr_5$ .

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3 years ago

A cell spends most of its life in this stage of the cell cycle, where it grows and replicates its DNA

Alekssandra [29.7K]

What are u asking there is no specific question

8 0

3 years ago

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Which of the following would dissolve in water?<br> CCl4<br> LiCl<br> CH4<br> PCl6

babymother [125]

Like dissolves like
so water is polar

CCl4 is nonpolar
LiCl is polar
CH4 is nonpolar
PCl6 is nonpolar

so LiCl would dissolve

7 0

3 years ago

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If a particular ore contains 58.5% calcium phosphate, what minimum mass of the ore must be processed to obtain 1.00 kg of phosph

alina1380 [7]

Calcium Phospate formula: Ca3(PO4)2

Atomic weight:
Ca = 40 ; P = 31 ; O = 16

Ca3 = 40 * 3 = 120
P = 31
O4 = 16 * 4 = 64
(PO4)2 = (31 + 64) * 2 = 95 * 2 = 190

Ca3(PO4)2 = 120 + 190 = 310 g/mol

31/310 = 10% P in the calcium phospate

1.00kg * 1000 g/kg = 1000 g of phosphorus.

1000 g / 10% = 10,000 g of calcium phosphate

10,000 g / 58.5% = 17,094 grams of ore.

The minimum mass of the ore should be 17,094 grams or 17.094 kg.

5 0

3 years ago

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Scientific models are based on a set of observations. true or false

dimulka [17.4K]

True it is based on a set of observations

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4 years ago

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