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Phoenix [80]
3 years ago
10

Which element is metal?

Chemistry
2 answers:
9966 [12]3 years ago
7 0

Answer: Gold.

Silver.

Iron.

Copper.

Nickel.

Aluminum.

Mercury( Liquid metal)

Titanium.

more metals...

Explanation: There are many kinds of metal elements including the ones above. In total, there are about 98 metals in the Periodic Table out of the 118.

WITCHER [35]3 years ago
6 0

iron, lead, gold, aluminum, platinum, uranium, zinc, lithium, sodium, tin, silver, etc

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You need a 20% alcohol solution. on hand, you have a 240 ml of a 15% alcohol mixture. you also have 40% alcohol mixture. how muc
juin [17]
0.15*240=36 ml of alcohol in <span>240 ml of a 15% alcohol mixture
0.4x = </span>ml of alcohol in x ml of a 40% alcohol mixture
0.2(x+240)= ml of alcohol in (x+240) ml of a 20% alcohol mixture

0.15*240 + 0.4x = 0.2(x+240)
36+0.4x=0.2x+48
0.2x = 12
x=12/0.2=120/6=20 ml  of a 40% alcohol mixture
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3 years ago
One method used commercially to peel potatoes is to soak them in a solution of NaOH for a short time and then remove them from t
sergij07 [2.7K]

Answer:

b. 2.28 M

Explanation:

The reaction of neutralization of NaOH with H2SO4 is:

2NaOH + H2SO4 → Na2SO4 + 2H2O

<em>Where 2 moles of NaOH react per mole of H2SO4</em>

<em />

To solve the concentration of NaOH we need to find the moles of H2SO4. Using the chemical equation we can find the moles of NaOH that react and with the volume the molar concentration as follows:

<em>Moles H2SO4:</em>

45.7mL = 0.0457L * (0.500mol/L) = 0.02285 moles H2SO4

<em>Moles NaOH:</em>

0.02285 moles H2SO4 * (2moles NaOH / 1 mol H2SO4) = 0.0457moles NaOH

<em>Molarity NaOH:</em>

0.0457moles NaOH / 0.020L =

2.28M

Right option:

<h3>b. 2.28 M</h3>
7 0
2 years ago
Coal is burned in the atmosphere to release energy. Which gas is needed for burning to take place?
irga5000 [103]

Answer:

Oxygen gas is needed for burning to take place.

Explanation:

I don't say you have to mark my ans as brainliest but if it has really helped you plz don't forget to thank me...

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I think the answer is : 1
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