3 years ago

How do you know if a chemical change has taken place?

1 answer:

6 0

There are a few ways to tell if a reaction has taken place, these include temperature change, color change, formation of a precipitate, bubbling, and even odors. These all indicate that a chemical change has taken place.

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What is it called when moon is between setting and rising

miv72 [106K]

Answer:

I hope this link helps you.

Explanation:

http://astronomy.swin.edu.au/cosmos/P/Phases

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3 years ago

What is the net ionic equation for 2AgNO3 + 2NaOH = Ag2O + 2NaNO3 + H2O

soldi70 [24.7K]

Answer:

2Ag⁺ (aq) + 2OH⁻ (aq) → Ag₂O (s) + H₂O (l)

Explanation:

Step 1: RxN

2AgNO₃ + 2NaOH → Ag₂O + 2NaNO₃ + H₂O

Step 2: Define states of matter

2AgNO₃ (aq) + 2NaOH (aq) → Ag₂O (s) + 2NaNO₃ (aq) + H₂O (l)

Step 3: Total Ionic Equation

2Ag⁺ (aq) + 2NO₃⁻ (aq) + 2Na⁺ (aq) + 2OH⁻ (aq) → Ag₂O (s) + 2Na⁺ (aq) + 2NO₃⁻ (aq) + H₂O (l)

Step 4: Cancel out spectator ions

2Ag⁺ (aq) + 2OH⁻ (aq) → Ag₂O (s) + H₂O (l)

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3 years ago

A 4.00-gram sample of sodium chloride was added to a beaker containing 40.0 mL 0.033 M lead(II)

melamori03 [73]

The answer is going to be 2.5

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3 years ago

How’s it possible for liquid to boil at 25 C?

Lera25 [3.4K]

Answer:

Well, not always. It depends on where you're doing the boiling. In fact, water will boil at about 202 degrees in Denver, due to the lower air pressure at such high elevations

Explanation:

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4 years ago

Making an orgami bird a physical or a chemical change and why??

Oksana_A [137]

Answer:

physical

Explanation:

you are only changing the physical shape of the paper and not the chemical structure

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2 years ago

Read 2 more answers