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fgiga [73]
3 years ago
10

Question 1 2.3 kJ is how many J?​

Chemistry
1 answer:
Vinil7 [7]3 years ago
4 0

Answer:

2300J

Explanation:

1 kilojoule is 1000joules so to get how much is 2.3 multiply it with 1000

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What does the 2+ mean??
kodGreya [7K]
I don’t see a 2+. If you’re talking about the number next to your cursor, it’s a 23.
6 0
4 years ago
How many atoms of aluminum are there in a sample with a mass of 100.0 grams?
Ratling [72]
In order to find the number of moles in a sample we are tasked with first finding the number of moles in that sample.  This is because the moles in a substance indicates the amount of the substance that contains the same number of particles as 12 g of the Carbon-12 isotope [or equivalent to 6.02 × 10²³ (which is used as a standard in the world of moles).

Now,
If moles = mass ÷ molar mass

then mol of aluminum = 100 g ÷ 27g/mol
                                   
                                     = 3.704 mol

Now that you have calculated the moles then you can do a simple ratio and multiplication at arrive at the number of atoms that would be present in the 100 g of aluminum.

                  if 1 mol of aluminum contains 6.02 × 10²³ atoms
                 then let 3.704 mol of aluminum contain x

                  ∴  x = 3.704 mol  × (6.02 × 10²³)
                         
                         = 2.23 × 10²⁴

∴ 100 g of Al would contain  ~ 2.23 × 10²⁴ atoms
4 0
4 years ago
A bronze bell containing copper and tin is
uranmaximum [27]

Answer:

C. Sold solution

Explanation:

Using method of elimination;

A. Pure substance.

Bronze is not a Pure substance because the proportions of copper and tin are not the same in all  bronze. This option is wrong.

B. Colloidal Suspension

This option is wrong. Colloidal suspension involves one substance dispersed in another.

C. Sold solution

The bronze bell is an alloy. This definition suitable represents it. It is a solid solution containing copper and tin. This is the correct option.

D. Heterogeneous Mixture

Bronze is a mixture, however it is homogeneous and not heterogeneous. his is because one can not distinguish the copper from the tin in the mixture.

4 0
3 years ago
Convert 6.75 atm to torr Hg (using dimensional analysis method)
Naily [24]
Well, torr and Hg are different units, but they have the same conversiton with atm.  

The conversion for atm to torr or mmHg is 1 atm = 760 torr = 760 mmHg.

Because you have 6.75 atm you can find both the torr and mmHg.

To use dimensional analysis just make sure that you cancel out your units as you go.

6.75 atm * (760 torr / 1 atm) = 5130 torr or 5.13 x 10 to the -3 torr with significant figures.  

I hope this helped. 
5 0
4 years ago
When does phenolphthalein turn pink? in the presence of a base in the presence of an acid when it is in a neutral solution when
Lelu [443]

Answer:

in the presence of a base

Explanation:

<em>Phenolphthalein  will turn pink </em><em>in the presence of a base.</em>

<u>Phenolphthalein is an indicator that is used in acid/base titration to indicate end points. It responds to pH changes by changing its color. In basic solutions, the compound turns pink while it remains colorless in acidic medium. It has the chemical formula </u>C_2_0H_1_4O_4<u>.</u>

Phenolphthalein is considered a weak acid ordinarily and it ionizes incompletely in aqueous solution.

HIn --> H^+ + In^-

Addition of hydrogen ions shifts equilibrium to the left and the solution remains colorless while the addition of hydroxide ion removes the hydrogen ion and shifts the equilibrium to the right, giving pink coloration.

4 0
3 years ago
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