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3 years ago

Andrew noticed that the plastic in his chair didnt feel as cold as the metal legs. What statement best explains this observation

Chemistry

1 answer:

qaws [65]3 years ago

7 0

Answer:

Explanation:

Hi! :) You didn't post the statements, but the answer should be something about conduction. Hope this helps!

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Micah is investigating the transformation between potential and kinetic energy within a system. He uses a swinging pendulum in h

slega [8]

Answer: The total energy is maintained as energy transformed

Explanation:

The kinetic energy and potential energy is been maintained as each of the experiment is been performed which is 50Joules

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3 years ago

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When the pH value of a solution is changed from 2

inna [77]

increases my factor of 10

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The p subshell can hold up to eight electrons in an atom (2 points)<br> True or false?

hoa [83]

Answer: The statement is false

Explanation:

Electrons occupy a region in atoms known as orbitals or subs hell. These orbitals include

I) S-orbital: it can occupy a maximum of two electrons

II) P-orbital: It occupies a maximum of six electrons

III) D-orbital: it occupies a maximum of ten electrons

F and G-orbitals as examples of other orbitals present.

A good illustration of the 6 electrons occupied by the P-subshell is seen in Sodium (Na) with atomic number of 11

Na = 1s2, 2S2 2p6, 3s1

Note: extra electrons are transferred to the next orbital

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3 years ago

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The density of water is 1g/cm4...is this a physical property of water?

Talja [164]

Yes because your not changing the identity of the substance

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2 years ago

Dissolve 7, 8 grams of Mg and Al mixture with excess HCl solution. After the reaction, the mass of acid solution increased by 7,

fgiga [73]

Answer:

Mg = 2,5 g; Al = 5,3 g

Explanation:

1) Reactions

Mg + 2HCl ⟶ MgCl₂ + H₂

2Al + 6HCl ⟶ 2AlCl₃ + 3H₂

2) Mass of each metal

If there had been no reaction, the mass of the solution would have increased by 7,8 g.

The mass increased by only 7,0 g.

The missing 0,8 g must represent the mass of the hydrogen generated by the reaction.

We have two relations:

Mass of Mg + mass of Al = 7,8 g

H₂ from Mg + H₂ from Al = 0,8 g

i) Calculate the moles of H₂

$n = \text{0,8 g H}_{2} \times \dfrac{\text{1 mol H}_{2}}{\text{2,016 g H}_{2}} = \text{0.40 mol H}_{2}$

(ii) Solve the relationship

Let x = mass of Mg. Then

7,8 - x = mass of Al

Moles of Mg = x/24.30

Moles of Al = (7,8 - x)/26.98

Moles of H₂ from Mg = (1/1) × moles of Mg = 1 × (x/24,30) = 0,0412x

Moles of H₂ from Al = (3/2) × Moles of Al = 1.5(7,8 - x)/26,98 = (11,7 -1,5x)/26,98

$\begin{array}{rcl}0,0412x + \dfrac{ 11,7 - 1,5x }{26,98} &= &0,40\\\\ 1,11x + 11.7 - 1,5x &=& 10.7\\-0.39x& = &-1.0\\x &=& \text{2.5 g}\\\end{array}$

Mass of Mg = 2,5 g

Mass of Al = 7,8 g - 2,5 g = 5,3 g

The masses of the metals are Mg = 2,5 g; Al = 5,3 g

6 0

3 years ago