CHEMISTRY MIDDLE SCHOOL

PLS HELP QUICK WORTH 30 POINTS!!!!!!!!Complete the sentence. When a base is added to water, hydrogen ions __________. increase decrease stay the same disappear

Answers

Answer 1
Answer:

A base is a substance that has the tendency to release OH- ions. These ions then attract protons to form water.

For example:

NaOH is a strong base which dissociates into Na+ and OH- ions.

NaOH → Na+ + OH-

The OH- ions can then grab the H+ ions from water, thereby reducing the hydrogen ion concentration and increasing the pH

Ans :

When a base is added to water, hydrogen ions decrease.
Answer 2
Answer:

The answer is decrease.

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The columns of the main transition element start with group.........(2B, 4B, 3B, 5B)

Answers

Yes :) elements in the central block. Groups 4B–8B, 1B, and 2B, or 4–12) in the periodic table, for example, iron, manganese, chromium, and copper :) hope this helps!

Is neon element a metal nonmetal or metalloid

Answers

Neon is considered a "nonmetal inert gas".
Neon has the formula "Ne". It has atomic number of 10, which means it has 10 electrons configured as follows: 1s2, 2s2, 2p6. Based on this, neon is monoatomic and stable in standard form.
Neon is a colorless gas that exhibits an orange-red glow when placed in an electric field.

explain why lighting a sparkler is considered a spontaneous reaction even though it doesn't stat start spontaneously

Answers

Lighting a sparkler is considered a spontaneous reaction even though it doesn't start spontaneouslybecause it can occur by itself, or without the influence of any external forces once it is given the necessary energy needed for it to begin the reaction. 
The lighting of a sparkler is a common example of a spontaneous reaction which is often given in Science textbooks and exams around the world.

A 'spontaneous reaction' in chemistry refers to a reaction that continues on its own once started, not a reaction that starts spontaneously. A sparkler, once lit, undergoes a combustion reaction that needs no additional energy input.

The term spontaneous reaction in chemistry does not mean that a reaction starts spontaneously without any trigger. It actually refers to a reaction that, once started, continues without any additional external input. In the case of a sparkler, the initial energy to start the reaction is provided by lighting the sparkler. Once lit, the combustion reaction continues on its own, making it a spontaneous reaction.

The reactants in the sparkler (often metal powders and an oxidizing agent) are in a higher energy state than the products (typically metal oxides and heat) they form during burning. This difference in energy drives the reaction forward, making it spontaneous. The overall energy of the system decreases, which aligns with the principle of thermodynamics stating that a spontaneous process leads to a decrease in the system's free energy.

Learn more about Spontaneous Reactions here:

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Using the following equation:Fe2O3(s) + 3 H2(g) → 2 Fe(s) + 3 H2000)
a) How many grams of iron can be made from 6 moles H2​

Answers

223.4 g of iron can be formed from 6 moles of hydrogen gas.

Explanation:

Fe₂O₃(s) + 3 H₂(g) → 2 Fe(s) + 3 H₂O(l)

Since the given equation is the balanced one, we need 3 moles of hydrogen gas to make 2 moles of iron, so the molar ratio is 3:2. So, from 6 moles of hydrogen gas, we can make few moles of iron as,

$ (2* 6)/(3) = 4 moles of iron

Molar mass of iron = 55.85 g

So amount of iron produced = 4 moles × 55.85 g/mol = 223.4 g of iron

How can you demonstrate that a piece of chalk has mass?

Answers

You can demonstrate that a piece of chalk has mass by putting it on a pan scale. Pan scales determine mass in grams. Also if the mass feels like it has some weight to it (although not to be confused with weight, they are two different things!), it most likely has mass.
Hope this helps!!

What is a well-mixed mixture that contains a solvent and at least one solute

Answers

Maybe a solution.
Solution- a mixture containing liquids that has a solute(Minor component) that is distributed within the solvent(Major component)...Hope that helped :)
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