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2 years ago

Which of these materials is a substance?

Chemistry

1 answer:

Anni [7]2 years ago

6 0

Answer:

MAS BOBO KA PALA?!

Explanation:

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What is the meaning of separation methods

Lena [83]

Is the axt or process of moving aoart or forcing sonething apart

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2 years ago

Purification of nickel can be achieved by electrorefining nickel from an impure nickel anode onto a pure nickel cathode in an el

Alexxandr [17]

Answer: 530 hours

Explanation:

The reduction of Nickel ions to nickel is shown as:

$Ni^{2+}+2e^-\rightarrow Ni$

$96500\times 2=193000Coloumb$ of electricity deposits 1 mole of Nickel

1 mole of Nickel weighs = 58.7 g

Given quantity = 18.0 kg = 18000 g (1kg=1000g)

58.7 g of Nickel is deposited by 193000 C of electricity

18000 g of Nickel is deposited by = $\frac{193000}{58.7}\times 18000=59182282.8C$ of electricity

$Q=I\times t$

where Q= quantity of electricity in coloumbs = 59182282.8C

I = current in amperes = 31.0 A

t= time in seconds = ?

$59182282.8C=31.0A\times t$

$t=1909105.9sec$

(1h=3600 sec)

$t=530hours$

Thus 530 hours are required to plate 18.0 kg of nickel onto the cathode if the current passed through the cell is held constant at 31.0 A

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2 years ago

3. Indicate the type of reaction represented by each equation:

BartSMP [9]

3. Is double replacement

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3 years ago

Since the early 1990s, geneticists have produced ____________ crops that yield fruits and vegetables commonly found in U.S. supe

Setler [38]

<span>Since the early 1990s, geneticists have produced "genetically modified" crops that yield fruits and vegetables commonly found in U.S. supermarkets. Genetically modified plants (and also applicable to animals) in agriculture are those plants whose DNA are being modified using genetic engineering techniques.</span>

6 0

2 years ago

Read 2 more answers

The + symbol, on the products side, in a chemical equation means

malfutka [58]

Explanation:

Used to separate one reactant or product from another

If it's helpful ❤❤

THANK YOU

7 0

2 years ago