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jekas [21]
3 years ago
10

What kind of evidence can you use to determine if a chemical reaction has occured?

Chemistry
2 answers:
Harman [31]3 years ago
8 0
Use your senses, so sound, smell( pls waft), change in color or tempurature, bubbles, or light
Orlov [11]3 years ago
5 0
Physical changes such as change in color and formation of a precipitate
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Which of the following statements about noncovalent interactions are true? Charge-charge interactions (salt bridge, ionic bond)
emmainna [20.7K]

Answer:

Charge-charge interactions (salt bridge, ionic bond) are electrostatic interactions between a pair of ions is True.

Explanation:

Electrostatic interaction between pairs of ions involves the transfer of ion/charges from two bonding elements in their ionic state

5 0
3 years ago
+
aleksklad [387]

Answer:

<h3>The answer is 41.05 %</h3>

Explanation:

The percentage error of a certain measurement can be found by using the formula

P(\%) =  \frac{error}{actual \:  \: number}  \times 100\% \\

From the question

actual density = 0.95 g/mL

error = 0.95 - 0.56 = 0.39

So we have

p(\%) =  \frac{0.39}{0.95}  \times 100 \\  = 41.0526315...

We have the final answer as

<h3>41.05 %</h3>

Hope this helps you

4 0
3 years ago
What do you mean by fractional column?​
jekas [21]
A tall, horizontally subdivided or packed container for fractional distillation in which vapor passes upward and condensing liquid flows downward. The vapor becomes progressively enriched in more volatile components as it ascends, and the less volatile components become concentrated in the descending liquid, which can be drawn off.
3 0
3 years ago
Read 2 more answers
Describe how each way to separate a mixture works Magnetic attraction: Evaporation: Filtration: Distillation:
jeka94

Answer:

Evaporation is great for separating a mixture (solution) of a soluble solid and a solvent. The process involves heating the solution until the solvent evaporates (turns into gas) leaving behind the solid residue. ... This method is best for separating a liquid from a solution.

Filtration is a method for separating an insoluble solid from a liquid. When a mixture of sand and water is filtered: the sand stays behind in the filter paper (it becomes the residue ) the water passes through the filter paper (it becomes the filtrate )

Magnetic separation is the process of separating components of mixtures by using magnets to attract magnetic materials. ... Due to the magnets, magnetic particles are being drifted by the movement of the drums. This can create a magnetic concentrate (e.g. an ore concentrate).

Explanation:

That's your answer.

5 0
3 years ago
Your experiment requires 150 mL of 7.7 M NaOH. How many grams of NaOH will you need?
Elodia [21]
You have molarity and you have volume. Use the formula :
Molarity(M)= Moles(N)/Liter(L)            to get the solution. 
150 ml= .150 L
7.7 = N/.150
N=.1.155 moles of NaOH.
 And since you know the moles, use the molar mass to figure out the grams.
<span> (40g/mol NaOH) x (1.155mol) =  
46.2 g of NaOH.</span>
7 0
3 years ago
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