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3 years ago

Which is a chemical property of copper?

1 answer:

7 0

The answer should be B, it reacts in air to form a green layer.

Chemical properties means that how the substance that reacts with other substance to produce new substances. Usually it cannot be measured or observed just with the substance itself.

From all the options above, only B is a reaction. The green layer formed is a new substance produced by copper and air. It involves a chemical change.

Other options like boiling points or state of matter, these are physical properties. They do not require it to react to other substances and the can be measured and observed easily.

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Which solutions is more basic: a solution with a pH of 9 or a solution with a pH of 12?

Nuetrik [128]

Answer:

Explanation:

pH= 7 is neutral, pH<7 - acidic solutions,

pH>7 - basic solution.

The more value of pH, the more basic solution is.

So, the solution with pH = 12 is more basic.

5 0

8 months ago

How do scientists classify intrusive igneous features? according to shape, texture, and their distance from the nearest volcanic

Nataliya [291]

according to shape, size, and their relationship to surrounding layers of rock

Explanation:

Scientists classify intrusive features according to their shape, size and relationship to surrounding layers of rocks.

Intrusive igneous features are the sills, di/kes, batholith, laccoiith, lopolith e.t.c

When magma cools and solidifies within the earth crust, they form intrusive igneous rocks.
Intrusive igneous rocks differs from one another in their shape, size and relationship to surrounding rocks.
For example, batholith is a large intrusive body that extends for several kilometers in the earth surface.
Sills and di/kes are smaller bodies. Sills forms parallel to orientation of rocks in an area. Di/kes are known to cut across the orientation.

Learn more:

Sedimentary rocks brainly.com/question/2740663

#learnwithBrainly

6 0

2 years ago

Calculate the quantity of energy released when 783 g of steam condenses. (show work)

Angelina_Jolie [31]

Answer:

firstark as brainliest

Explanation:

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7 0

1 year ago

The vapor above a mixture of pentane and hexane at room temperature contains 35.5% pentane by mass. What is the mass percent com

FrozenT [24]

The mass percent of Pentane in solution is 16.49%

The mass percent of Hexane in solution is 83.51%

Explanation:

Take 1 kg basis for the vapor: 35.5 mass% pentane = 355 g pentane with 645 g hexane.

Convert these values to mol% using their molecular weights:

Pentane: Mp = 72.15 g/mol -> 355g/72.15 g/mol = 4.92mol

Hexane: Mh = 86.18 g/mol -> 645g/86.18 g/mol = 7.48mol

Pentane mol%: yp = 4.92/(4.92+7.48) = 39.68%

Hexane mol%: yh = 100 - 39.68 = 60.32%

Pp-vap = 425 torr = 0.555atm

Ph-vap = 151 torr = 0.199atm

From Raoult's law we know:

Pp = xp $\times$ Pp - vap = yp $\times$ Pt (1)

Ph = xh $\times$ Ph - vap = yh $\times$ Pt (2)

Since it is a binary mixture we can write xh = (1 - xp) and yh = (1 - yp), therefore (2) becomes:

(1 - xp) $\times$ Ph - vap = (1 - yp) $\times$ Pt (3)

Substituting (1) into (3) we get:

(1-xp) $\times$ Ph - vap = (1 - yp) $\times$ xp $\times$ Pp - vap / yp (4)

Rearrange for xp:

xp = Ph - vap / (Pp - vap/yp - Pp - vap + Ph - vap) (5)

Subbing in the values we find:

Pentane mol% in solution: xp = 19.08%

Hexane mol% in solution: xh = 80.92%

Now for converting these mol% to mass%, take 1 mol basis for the solution and multiplying it by molar mass:

mp = 0.1908 mol $\times$ 72.15 g/mol

= 13.766 g

mh = 0.8092 mol $\times$ 86.18 g/mol

= 69.737 g

Mass% of Pentane solution = 13.766/(13.766+69.737)

= 16.49%

Mass% of Hexane solution = 83.51%

8 0

2 years ago

If 65 grams of sodium carbonate powder is reacted with excess sulfuric acid, then how many mL of gas over water are collected at

shtirl [24]

Answer:

Explanation:

7 0

2 years ago