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son4ous [18]
2 years ago
6

Hey! If someone could help me out I would really appreciate it even if it was just one answer. I'm really stuck on 3. Its second

year of chem!

Chemistry
1 answer:
Sphinxa [80]2 years ago
7 0

Answer:

I would go for number 5 . It sounds more logical to me.

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The change of matter, solid, liquid and gas is called a_________.
valkas [14]

Answer:

This would be a phase change

Explanation:

Since the diffrent phases solid,liquid,gas are changing to other phases.

Sorry for the bad explanation.

7 0
3 years ago
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Which element in group 2 (Alkaline Earth Metals) is the most reactive?
never [62]

Answer:

the reactivity of alkaline earth metals increases from top to the bottom of the group, that's because the atoms get bigger from the top to the bottom so the valence electrons are farther from the nucleus.

8 0
2 years ago
What are the limitations of litmus paper and Phenolphthalein indicators? Name to other indicators that can be used that do not h
jenyasd209 [6]

Answer:

Here's what I find.

Explanation:

An indicator is usually is a weak acid in which the acid and base forms have different colours. Most indicators change colour over a narrow pH range.

(a) Litmus

Litmus is red in acid (< pH 5) and blue in base (> pH 8).

This is a rather wide pH range, so litmus is not much good in titrations.

However, the range is which it changes colour includes pH 7 (neutral), so it is good for distinguishing between acids and bases.

(b) Phenolphthalein

Phenolphthalein  is colourless in acid (< pH 8.3) and red in base (> pH 10).

This is a narrow pH range, so phenolphthalein is good for titrating acids with strong bases..

However, it can't distinguish between acids and weakly basic solutions.

It would be colourless in a strongly acid solution with pH =1 and in a basic solution with pH = 8.

(c) Other indicators  

Other acid-base indicators have the general limitations as phenolphthalein. Most of them have a small pH range, so they are useful in acid-base titrations.

The only one that could serve as a general acid-base indicator is bromothymol blue, which has a pH range of 6.0 to 7.6.

5 0
3 years ago
Which one of the following compounds produces a basic solution when
JulsSmile [24]

Answer:

Rb2O

Explanation:

6 0
2 years ago
2 C2H2 + 5 O2<br> 2 H2O + 4 CO2 <br> what reaction type
Alexxx [7]

Answer:

Combustion reaction

General Formulas and Concepts:

<u>Chemistry</u>

  • Synthesis Reactions: A + B → AB
  • Decomposition Reactions: AB → A + B
  • Single-Replacement Reactions: A + BC → AB + C
  • Double-Replacement Reactions: AB + CD → AD + BC

Explanation:

<u>Step 1: Define</u>

2C₂H₂ + 5O₂ → 2H₂O + 4CO₂

<u>Step 2: Identify</u>

Any organic molecule reacting with oxygen to produce water and carbon dioxide is a combustion reaction.

We also see from the RxN that is is a double replacement reaction.

5 0
2 years ago
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