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Charra [1.4K]
3 years ago
14

4. What parts of Dalton’s atomic theory no longer agree with the current picture of the atom? Provide an answer using 3 – 4 sent

ences in your own words.
Chemistry
2 answers:
pogonyaev3 years ago
7 0
<span>Since you did not show any picture, I will be describing Dalton’s atomic theory. The scientist thought that the atom was the smallest particle in the universe is John Dalton. He established five theories relating atoms. One, elements are made of extremely small particles called atoms. Two, atoms of different element have different sizes, mass and physico – chemical properties. Three, atoms cannot be divided further, destroyed or created. It also follows the law of conservation of energy. Fourth, atoms can combine to form compounds. And lastly, in chemical reaction, atoms can be combined, separated or rearranged. </span>
Serjik [45]3 years ago
6 0

dalton said that the atom is the smallest particle but now we know that an atom can be divided into electron proton and neutron.

the guy below should be deleted but you cant cause its approved, he didnt even asnwer the question XD

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A 20.0 % by mass solution of phosphoric acid (H 3PO 4) in water has a density of 1.114 g/mL at 20°C. What is the molarity of thi
Vinvika [58]

Answer:

2.28 M

Explanation:

Step 1: Given data

Percent by mass (%m/m): 20.0 %

Density (ρ): 1.114 g/mL

Step 2: Calculate the percent by volume (%m/v)

We will use the following expression.

\% m/v = \% m/m \times \rho = 20.0 \%  \times 1.114g/mL = 22.3 g \% mL

Step 3: Calculate the moles of solute in 100 mL of solution

The molar mass of phosphoric acid is 97.99 g/mol. The moles corresponding to 22.3 g are:

22.3g \times \frac{1mol}{97.99g} = 0.228mol

Step 4: Calculate the molarity of the solution

0.228 moles of solute are in 100 mL (0.100 L) of solution. The molarity of the solution is:

M = \frac{0.228mol}{0.100L} =2.28 M

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3 years ago
How many moles are there in a 1.00 kg bottle of water?
ipn [44]
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3 years ago
Without doing any calculations, which transition in the hydrogen atom has the shortest wavelength?
LiRa [457]
The n=2 --> n=1 transition in the hydrogen atom has the shortest wavelength. In addition, microwave has a highest frequency wave. In finding the limiting reagent, grams divided by the molar mass and the answer will be divided by the coefficients and the lowest amount is the limiting reagent. 
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How reactive is an atom of Sodium(Na) and why? Question 1 options: Sodium (Na) is very reactive because it does not have a full
pentagon [3]
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8 0
3 years ago
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Bess [88]

Answer:

pH = 1.95

Explanation:

For polyprotic acids, it is generally assumed that all H⁺ comes from the 1st ionization step. The amount of H⁺ delivered into solution for the 2nd and 3rd ionization steps are in the order of 10⁻⁴M and 10⁻⁶M respectively and provide very little change in pH from the quantity delivered in the 1st ionization step.

Therefore... the [H⁺] concentraion and pH are computed as follows...

[H⁺] = √Ka₁[H₃AsO₄] = √(2.5 x 10⁻⁴)(0.500) M = 0.1118M

pH = -log[H⁺] = -log(0.01118) = 1.95

8 0
3 years ago
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