Give one example each of an aqueous solution of a strong base and an aqueous solution of a weak base

Answers

Answer 1

Answer: An example of an aqueous solution of a strong base is NaOH (sodium hydroxide) in water. The NaOH dissociates completely in water into Na+ and OH- ions. An example of an aqueous solution of a weak base is NH3 (ammonia) in water. Here, the NH3 does not completely dissociate because it is a weak base.

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Andy is waiting at the signal. As soon as the light turns green, he accelerates his car at a uniform rate of 8.00 meters/second2. What is the displacement of Andy’s car after 30.0 seconds?A.
1200 meters
B.
2400 meters
C.
3600 meters
D.
4800 meters
E.
7200 meters

Answers

The answer is B
8m/s
Your going to multiply 8 and 30 together which gives you 240.

Claculate the molar mass of sodium sulphate na2so4

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Na₂SO₄ = 23 * 2 + 32 + 16 * 4 = 142.0 g/mol

hope this helps!

Balance this chemical equation: ___ N2 (g) __O2 (g) → ___ H2O ___ NO3 (aq)

Answers

Answer:

To balance the chemical equation, I'll assume the reaction is carried out under standard conditions. Here's the balanced equation:

2 N2 (g) + 5 O2 (g) → 4 H2O (l) + 4 NO3- (aq)

Explanation:

To balance the number of nitrogen (N) atoms, we need 2 nitrogen molecules (N2) on the left side. This gives us a total of 4 nitrogen atoms on the left side.

To balance the number of oxygen (O) atoms, we need 5 oxygen molecules (O2) on the left side. This gives us a total of 10 oxygen atoms on the left side.

On the right side, we need 4 water molecules (H2O) to balance the hydrogen (H) atoms. This gives us a total of 8 hydrogen atoms on the right side.

Finally, to balance the oxygen (O) atoms on the right side, we need 4 nitrate ions (NO3-) since each nitrate ion contains one nitrogen and three oxygen atoms. This gives us a total of 12 oxygen atoms on the right side.

Now the equation is balanced with 4 nitrogen atoms, 10 oxygen atoms, 8 hydrogen atoms, and 4 nitrate ions on both sides.

Which condensed structural formula represents an unsaturated compound?(1) CH3CHCHCH3
(2) CH3CH2CH3
(3) CH3CH3
(4) CH4

Answers

Answer: The correct answer is option (1).

Explanation:

The general formula of alkanes (Saturated compounds) is given as: $C_nH_(2n+2)$

The general formula of alkene (Unsaturated compounds)is given as: $C_nH_(2n)$

The general formula of alkynes (Unsaturated compounds)is given as: $C_nH_(2n-2)$

1. $CH_3CHCHCH_3:C_4H_8$ unsaturated hydrocarbon

2. $CH_3CH_2CH_3:C_3H_8$ Saturated hydrocarbon

3. $CH_3CH_3:C_2H_6$ Saturate hydrocarbon

4. $CH_4$ Saturated hydrocarbon

Number(1).A carbon atom makes 4 bondings.As the second Carbon in the conpuond has only one hidrogen,it has to make other 3,two with the other carbon atoms,one of them Being a double,making the compound unsaturated.PS:Sorry for my english,um fron Brazil

Lithium hydroxide is classified as an A. Arrhenius base B. Arrhenius acid C. Alcohol D. Aldehyde

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Lithium hydroxide is classified as an annhenius base since it dissociates into lithium cations and hydroxide an ions and Arrhenius bases are defined as a substance that dissociated into hydroxide anions (as well as cations) when in solution. I hope this helps. Let me know if anything is unclear.

Is crumpling a sheet of paper a physical or chemical change? Why?

Answers

I believe it is a physical change. Crumpling a sheet of paper does not change any properties of the paper and it does not form a new substance it must be a physical change. It is only the shape or form of the paper that is being changed. Hope this answers the question.

It's a physical change. You're not changing the chemical make up of the piece of paper. Only the appearance.

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