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Hoochie [10]
3 years ago
9

What are the 5 ways to identify if a chemical reaction happened?

Chemistry
1 answer:
vlada-n [284]3 years ago
7 0

Answer:

a new substance is formed, if heat is formed, color change, the evolution of gas, and bubbles or fizzing

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How many inches are in 450 cm ?
Karolina [17]
How many inches are in 450 cm?

0.393701 in =  1 cm

0.393701 × 450 = <span>177.16545

450 cm = </span><span>177.16545 in</span>
3 0
3 years ago
The balanced equation for the reaction of ammonia and oxygen is the following. 4 NH3(g) + 5 O2(g) → 4 NO(g) + 6 H2O(g) The stand
ale4655 [162]

Answer:

ΔS° = 180.5 J/mol.K

Explanation:

Let's consider the following reaction.

4 NH₃(g) + 5 O₂(g) → 4 NO(g) + 6 H₂O(g)

The standard molar entropy of the reaction (ΔS°) can be calculated using the following expression.

ΔS° = ∑np × S°p - ∑nr × S°r

where,

ni are the moles of reactants and products

S°i are the standard molar entropies of reactants and products

ΔS° = 4 mol × S°(NO(g)) + 6 × S°(H₂O(g)) - 4 mol × S°(NH₃(g)) - 5 mol × S°(O₂(g))

ΔS° = 4 mol × 210.8 J/K.mol + 6 × 188.8 j/K.mol - 4 mol × 192.5 J/K.mol - 5 mol × 205.1 J/K.mol

ΔS° = 180.5 J/K

This is the change in the entropy per mole of reaction.

7 0
3 years ago
Zoom in if need to<br> PLEASE HELP DUE TOMARROW
padilas [110]
The best way to do this is to google search each question, or look it up on quizlet.com
5 0
3 years ago
Provide a title short explanation or description accompanying an illustration or a photograph ​
alexdok [17]
A small, green frog wearing a strawberry on its head as a hat

6 0
2 years ago
Covert from scientific notation<br> 1.3 x 10¹²=
Lady_Fox [76]

Answer:

1,300,000,000,000

Explanation:

1.3 x 10^12

We want to convert this from scientific notation.

Tip: in scientific notation the exponent tells you how many place you move the decimal point over. If the exponent is negative you move the decimal point to the left. Ex. For, 4.1 x 10^-8, we would move the decimal point over 8 times to the left to get .00000041. When the exponent is positive we move over to the right. Ex. For, 7.6 x 10^7 we would move the decimal point over 7 times to the right to get 76,000,000

So to convert 1.3 x 10^12 we simply move over the decimal point over 12 times to the right.

1.3 x 10^12 ------> 1,300,000,000,000

Our answer is 1,300,000,000,000

6 0
2 years ago
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