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3 years ago

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- Write down Rutherford's atomic model with diagram .also write down defects of Rutherford's atomic model. - write down neil boh

ar atomic model

1 answer:

anastassius [24]3 years ago

5 0

this is the answer

sorry if the answer is wrong

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Answer the following questions based on the reaction below: NaOH(aq) + KHP(s) --> NaKP(aq)+H2O(I)

Natali [406]

Answer:

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<u>a) 1.44g</u>

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<u>b) 77.3%</u>

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Explanation:

<u>1. Chemical balanced equation (given)</u>

$NaOH(aq)+ KHP(s)\rightarrow NaKP(aq)+H_2O(l)$

<u>2. Mole ratio</u>

$1molNaOH(aq):1molKHP(s)$

This is, 1 mol of NaOH will reacts with 1 mol of KHP.

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<u>3. Find the number of moles in 72.14 mL of the base</u>

$Molarity=\text{number of moles of solute}/\text{volume of solution in liters}$

$\text{Volume of solution}=72.14mL=0.07214liters$

$\text{Number of moles of NaOH}=0.0978M\times 0.07214liter=0.007055mol$

<u>4. Find the number of grams of KHP that reacted</u>

The number of moles of KHP that reacted is equal to the number of moles of NaOH, 0.007055 mol

Convert moles to grams:

mass = number moles × molar mass = 0.007055mol × 204.23g/mol

mass = 1.4408 g.

You have to round to 3 significant figures: 1.44 g (because the molarity is given with 3 significant figures).

<u>5. Find the percentage of KHP in the sample</u>

The percentage is how much of the substance is in 100 parts of the sample.

The formula is:

% = (mass of substance / mass of sample) × 100

% = (1.4408g/ 1.864g) × 100 = 77.3%

7 0

3 years ago

What happens when identical objects are dropped under the same gravitational conditions. NEED HELP ASAP.

Papessa [141]

they will both do the exact same thing, as long as they are bothh identical

5 0

3 years ago

Where are people mostly exposed to chemicals?

Vlad [161]

Answer:

people are mostly exposed to chemicals through their nose, mouth, eyes, and ears

Explanation:

they are the easiest way for anything, bad or good, to enter the body because people touch their face alot.

This might not answer what you were looking for but the other answer covered it pretty well so I thought I'd give you another angle to the question!

Hope this helps!!

4 0

3 years ago

How did the development of the earliest idea about atoms differ from the later work of scientists?

Ket [755]

Answer:

C

Explanation:

The early ideas of the atom states that the indivisible object is hollow or is a solid object with nothing inside. The later discoveries or works of the scientists states that inside the atoms are the subatomic particles which are the electrons, protons, and neutrons.

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3 years ago

Identity the decomposers in this food web.<br>

makkiz [27]

dont know what the web looks like but mushrooms are decomposers

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3 years ago