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kherson [118]
3 years ago
5

When is a hypothesis useful in science?

Chemistry
1 answer:
fredd [130]3 years ago
7 0

A hypothesis is an experimental question that can later be proven correct or incorrect by scientific evidence.

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1. _ LiBr2 + __K2CO3 --&gt;___ LiCO3 +_ KBr<br> Reaction Type:
Arada [10]

Answer:

Double displacement chemical reaction.

Explanation:

Hello,

In this case, for the given reaction we firstly balance it:

LiBr_2 +K_2CO3 \rightarrow LiCO3 +2KBr

Then, since the lithium and potassium cations are being exchanged to each other from bromide and carbonate, we are talking about a double displacement chemical reaction.

Best regards.

5 0
4 years ago
What is the concentration of chloride ions in a solution formed by mixing 150. mL of a 1.50 M NaCl solution with 250. mL of a 0.
joja [24]
Here, we apply a mass balance:
Moles of chloride ions in final solution = sum of moles of chloride ions in added solutions

We must also not that each mole of sodium chloride will release one mole of chloride ions, while each mole of magnesium chloride will release two moles of chloride ions.
Moles = concentration * volume
Moles in final solution = moles in NaCl solution + moles in MgCl₂ solution
C * (150 + 250) = 1.5 * 150 + 2 * 0.75 * 250
C = 1.5 M

The final concentration is 1.5 M
4 0
3 years ago
A sound with more vibrations per second sounds higher than a sound with fewer vibrations per second.
Fudgin [204]

Answer:

that is a false sentence

6 0
3 years ago
Read 2 more answers
Grasslands are a biome that receives 25-75 cm of rain each year and contain what?
s2008m [1.1K]

Answer:

<h3><em>A is most likely your correct answer</em></h3>

Explanation:

A. Hills Covered with dry brush- this is most likely correct

b. Hills covered in lush grass- incorrect, because it is LUSH grass which would require lots of rain.

c. Flat lands with little grass- incorrect because grasslands DO have lots of grass.

D- incorrect because grasslands typically do NOT have rocky mountains <u>but are generally flatlands with grass</u>

<u />

<h3>I am so sorry if this is wrong, I am just using common knowledge. TREASURE EVERY MOMENT AND HAVE AN AMAZING DAY!! ;)</h3>
7 0
3 years ago
The amount of which subatomic particle is different between an atom and its ion?
11111nata11111 [884]
There are three subatomic particles known: (1) electron which is found outside the nucleus of an atom and (2 and 3) protons and neutrons which are both inside the nucleus. As they are outside the nucleus, it is easier to transport electron than any other subatomic particle. Thus, atom and its ion differ in the number of electrons. 
7 0
3 years ago
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