3 years ago

Which of these would be caused by a chemical change?

Chemistry

2 answers:

Irina18 [472]3 years ago

4 0

<h2>The Answer to this question is C</h2>

s2008m [1.1K]3 years ago

3 0

Metamorphic rock forming from igneous.

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Naturally occurring boron has an atomic weight of 10.811. Its principal isotopes are 10B and 11B. Part A What is the abundance (

Darya [45]

Answer:

10B has 18.9%

11B has 81.1%

Explanation:Please see attachment for explanation

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4 years ago

Fruit juice when boiled taste sweeter than sucrose because

irina1246 [14]

Answer :see explanation

Explanation:

the sweet carbohydrate in fruit is not sucrose , it is fructose.

and fructose tastes sweeter than sucrose

fructose and glucose minus water equals sucrose

and fructose is sweeter than glucose

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2 years ago

1. Of 100 animals on a farm, 20% are horses, 15 % are pigs, 30% are cows, and 35% are

ANEK [815]

B. a circle graph

circle graphs are the best to show percentages because they’re very easy to look at and get info from

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3 years ago

Two equilibrium reactions of nitrogen with oxygen, with their corresponding equilibrium constants (Kc) at a certain temperature,

7nadin3 [17]

Answer:

Kc = 1.54e - 31 / 2.61e - 24

Explanation:

1 ) $N_{2}(gas) + O_{2}(gas)\rightarrow 2NO(gas)$ ; Kc = 1.54e - 31

2) $N_{2}(gas) + 1/2O_{2}(gas)\rightarrow N_{2}O(gas)$ ; Kc = 2.16e - 24

upon reversing ( 2 ) equation

$N_{2}O(gas)\rightarrow N_{2}(gas) + 1/2O_{2}(gas)$ Kc = 1/2.16e - 24

now adding 1 and reversed equation (2)

$N_{2}(gas) + O_{2}(gas)\rightarrow 2NO(gas)$

$N_{2}O(gas)\rightarrow N_{2}(gas) + 1/2O_{2}(gas)$

we get ,

$N_{2}O(gas) + 1/2O_{2}(gas)\rightarrow 2NO(gas)$ Kc = 1.54e-31 × 1/2.61e - 24

equilibrium constant of equation (3) is -

Kc = 1.54e - 31 / 2.61e - 24

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3 years ago

At what temperatures is a reaction that has a positive change in entropy

Setler [38]

Answer:

the answer is A

I made a chart for AP chem if you want to refer to it.

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3 years ago