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blagie [28]
3 years ago
6

When a candle is burning is it a physical or chemical change?

Chemistry
2 answers:
Andrews [41]3 years ago
7 0
It is a physical chance
dexar [7]3 years ago
7 0
It is both a physical and chemical change. Let me know if you need an explanation on why :) 

Hope it helps!
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Gravity is best described as the attractive force _____.
Anettt [7]

Answer:

<em>think</em><em> </em><em>it's</em><em> </em><em>B</em>

Explanation:

Gravity is a force of attraction that exists between any two masses, any two bodies, any two particles. Gravity is not just the attraction between objects and the Earth. It is an attraction that exists between all objects, everywhere in the universe.

<em>H</em><em>o</em><em>p</em><em>e</em><em> </em><em>it'll</em><em> </em><em>help</em><em>!</em>

<em>s</em><em>t</em><em>a</em><em>y</em><em> </em><em>safe</em><em>:</em><em>)</em><em> </em><em>^</em><em>-</em><em>^</em>

4 0
4 years ago
1.00L of a gas at STP is compressed to 473 ml. What is the new pressure of the gas?
I am Lyosha [343]
P₁V₁ = P₂V₂

Convert 473ml > LP = \frac{(1ATM)(1.00L)}{(0.473L)}

(1atm)(1.00L) = (0.473L)P₂

Divide by (0.473L)

P = \frac{(1atm)(1.00L)}{(0.473L)}

Solve for 2.11atm
4 0
4 years ago
Read 2 more answers
Write a nuclear equation for the alpha decay of 23892U.23892U → 0−1e + 23893Np23892U → 10n + 23792U23892U → 42He + 23490Th23892U
romanna [79]

Answer:

23892U=23490Th +42He

Explanation:

In alpha decay, the daughter nucleus is two units less than the parent in atomic number. The mass number also decreases by 4 units. The daughter is thus found two places before the parent in the periodic table.

5 0
3 years ago
Part A - Calculate the molar solubility in water
Andrei [34K]
Part 1)

when the balanced equation for this reaction is:

and by using ICE table

                Mg(OH)2(s) ↔ Mg2+(aq) + 2OH-(aq)

initial                                     0                0

change                                +X               +2X

Equ                                        X                 2X

 When KSp expression = [Mg2+][OH-]

when we have KSp = 5.61 x 10^-11

and when we assumed [Mg2+] = X

and [ OH-] = (2X)^2

when we assume X is the value of molar solubility of Mg(OH)2
 
so, by substitution:

5.61 x 10^-11 = 4X^3

∴ X = 2.4 x 10^-4 M

∴ molar solubility of Mg(OH)2 = X = 2.4 x 10^-4 M 

Part 2) 

the molar solubility of Mg(OH)2 in 0.16 m NaOH we assumed it = X

by using the ICE table:

                Mg(OH)2(s) → Mg2+(aq)  +  2OH-

initial                                   0                  0.16m

change                               +X                +2X

equ                                        X                (0.16+2x)

when Ksp = [mg2+][OH-]^2

5.61 x 10^-11 = X * (0.16+2X)^2 by solving for X

∴ X = 1.3 x 10^-5 M

∴ the molar solubility = X = 1.3 x 10^-5 M          



3 0
4 years ago
Calculate ΔS∘rxn for the balanced chemical equation 2H2S(g)+3O2(g)→2H2O(g)+2SO2(g) Express the entropy change to four significan
Alik [6]

Answer:

-170.65

188.8+ 256.8-205.8-(2x205.2)

3 0
4 years ago
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