CHEMISTRY MIDDLE SCHOOL

_Cuo +H, → _Cu + _H,0

Answers

Answer 1

Answer:

CuO(s) + H₂(g) → Cu(s) + H₂O(l)

Explanation:

Assuming the reaction is the reduction of CuO by H₂
Then the balanced equation for the reaction is;

CuO(s) + H₂(g) → Cu(s) + H₂O(l)

The equation shows the reducing property of hydrogen gas, such that hydrogen reduces metal oxides such as copper(ii)oxide to the respective metals.
The law of conservation requires chemical equations to be balanced so as the mass of reactants will be equal to that of products.

In this case; there is 1 copper atom, 1 oxygen atom and 2 hydrogen atoms on both side of the equation and thus the equation is balanced.

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Physical and chemical properties

what is density when mass is 5.2 and volume is 0.117

Answers

Density = mass / volume

D = 5.2 / 0.117

D = 44.44

What is the greatest number of electrons in the first seven energy level

Answers

Answer:

280 electrons

Explanation:

The number of electrons in each energy level are determine by using following formula:

2n²

Here "n' is the energy level. we will put the energy level number in place of "n" and number of electrons will easily found.

Principle energy levels number of electrons

1 2n² = 2(1)²= 2

2 2n² = 2(2)²= 8

3 2n² = 2(3)²= 18

4 2n² = 2(4)²= 32

5 2n² = 2(5)²= 50

6 2n² = 2(6)²= 72

7 2n² = 2(7)²= 98

So the total number of electrons in first seven energy levels will be the sum of the number of electrons in each energy levels.

2+8+18+32+50+72+98 = 280 electrons

What is the order of epoch eon era and period from big to small? From largest to smallest Eon, Era, Period, Epoch.

Answers

smallest to largest: epoch, period, era, eon

Which reaction is single replacement?(1) 2H2O2 --> 2H2O + O2

(2) 2H2 + O2 --> 2H2O

(3) H2SO4 + Mg --> H2 + MgSO4

(4) HCl + KOH --> KCl + H2O

Answers

Among the given choices, the third option is the only one which illustrates single replacement. (3)H2SO4 + Mg --> H2 + MgSO4 A single replacement is also termed as single-displacement reaction, a reaction by which an element in a compound, displaces another element. It can be illustrated this way: X + Y-Z → X-Z + Y

In a single replacement reaction (or simple displacement) an element reacts with a compound and takes the place of another element in that compound. The reaction that shows a sigle replacement is the third one. Where H2SO4 and Mg turn into H2 + MgSO4. In this case Mg replaces H2

Please help asap! I have no idea what to write! :) Thanks a bunch!!

Answers

Answer:

I don't know

Explanation:

Is the unlimited source of energy for all living things is the leaf. Is that true or false

Answers

Uhh...
.
Do we eat leaves?
.
I mean, yeah, we do... basil leaves...
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but really, what gives leaves energy?
.
huh?
.
I can't hear you.
.
Think again.
.
Say it aloud!!
.
LOUDER.
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Yup. The sun.
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The sun never ends. See, the sun provides energy for plants. animals eat plants. we eat plants and animals.
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No sun?
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we dead

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Given the balanced equation representing a reaction:Al2(SO4)3 +6NaOH ==> 2Al(OH)3 + 3Na2SO4 The mole ratio of NaOH to Al(OH)3 is (1) 1:1 (2) 3:1 (3) 1:3 (4) 3:7