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topjm [15]
3 years ago
12

Read carefully and choose the correct answer.ill mark brainliest​

Chemistry
1 answer:
Veseljchak [2.6K]3 years ago
5 0

Answer:

Hello shaggy

Explanation:

Good morning dear

How are you

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The first task you are assigned in your summer laboratory job is to prepare a concentrated naoh stock solution. the molecular we
tensa zangetsu [6.8K]

240 g NaOH

<em>Step 1</em>. Calculate the moles of NaOH

Moles of NaOH = 0.750 L solution × (8 mol NaOH/1 L solution) = 6 mol NaOH

Step 2. Calculate the mass of NaOH

Mass of NaOH = 6 mol NaOH × (40 g NaOH/1 mol NaOH) = 240 g NaOH

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Is “ the silver spoons tarnished and turned black” physical or chemical property?
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it is a <em>Chemical property</em>

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Among the following, which is an oxidation-reduction reaction? Question 13 options: Na2S + CaCO3 → CaS + Na2CO3 2HNO3 + Mg(OH)2
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This one is an oxidation-rdcution equation:

<span>H2 + F2 → 2HF

How can you tell?

If the oxidation states of the atoms in the reactans are different from the oxidation states of the same atoms in the products then it is an oxidation-reduction reaction.

Both atoms H and F in the reactants have oxidation states 0.

That is a basic rule: any atom alone or bonded to the same kind of atom has oxidation state 0.

The oxidation states in HF are: H: +1, and F: -1.

So, the H increased its oxidation state, which is that ii is oxydized ; while F reduced its oxidation state so it is reduced.

Answer: H2 + F2 ----> 2HF
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5 0
3 years ago
What is one way that fish interact with a coral reef​
Digiron [165]

Answer:

Fishes play a vital role in the reef's food web, acting as both predators and prey. Their leftover food scraps and wastes provide food or nutrients for other reef inhabitants. Some species of sharks, skates, and rays live on or near the reef. ... These fish are herbivores and eat the algae within the coral.

Explanation:

8 0
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She collected 20 cm³ of oxygen. What volume of hydrogen could she also have collected at the same time?
loris [4]

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Assuming it was collected from the atmosphere it would be virtually nothing

Explanation:

hydrogen makes up 0.000055% of the atmosphere while oxygen makes up 23 percent. 20/400000 cm^3 of hydrogen

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