CHEMISTRY HIGH SCHOOL

Which scientist provided a foundation for John Dalton’s work on the atomic structure?Robert Millikan
Joseph Proust
Ernest Rutherford
J. J. Thomson

Answers

Answer 1
Answer:

Answer:

J.J. Thomson

Explanation:
Answer 2
Answer:

Answer:

D

Explanation:

took the test

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Arrange the following elements in order of increasing atomic radius : Rb , K , Na , Li
Solutions of aluminum nitrate and sodium sulfate react to form sodium nitrate and aluminum sulfate. Classify this reaction.2Al(NO3)3(aq) + 3Na2SO4(aq) → Al2(SO4)3(s) + 6NaNO3(aq) A) Synthesis B) Decomposition C) Double Replacement D) Single Replacement I choose C was wondering if I was correct
For Gay-Lussac's law, temperature is measured in _____.

How many total valence electrons take part in a triple bond between 2 atoms?

Answers

6, to do a single bond you need two singular valence electrons to create one bond. Therefore to create a triple bond you need 6 singular valance electrons.

Count the number of neutrons in Cesium-130/55 (Cs) A. 55 B. 75 C. 130 D. 185

Answers

The answer to the question is letter B which is 75. Cesium or also called as cesium is a chemical element with the symbol Cs. It is a silvery-gold element which is soft alkalai metal with melting point of 28.5 C. 

the given element is

¹³⁰₅₅Cs

the superscript - 130 is the atomic mass / mass number

mass number is the sum of protons and neutrons

subscript - 55 is the atomic number

atomic number is the number of protons

therefore we can write the following equations

protons = 55

protons + neutrons = 130

so neutrons = 130 - protons

nuetrons = 130 - 55 = 75

number of neutrons = 75

The temperature of a sample of matter is ameasure of the
(1) average potential energy of the particles of
the sample
(2) average kinetic energy of the particles of the
sample
(3) total nuclear energy of the sample
(4) total thermal energy of the sample

Answers

The temperature of a sample of matter is ameasure of the... average kinetic energy of the particles of thesample.

Ammonium hydroxide ionizes as follows: NH4OH(s) NH4 +(aq) + OH-(aq). If an excess of ammonium salt, such as NH4Cl (which ionizes to give NH4 +(aq) ions) is added to the equilibrium shown above, you could predict that the result will be to....

Answers

Answer: The dissociation of the base will be further suppressed.

Explanation: Any change in the equilibrium is studied on the basis of Le-Chatelier's principle.

This principle states that if there is any change in the variables of the reaction, the equilibrium will shift in the direction to minimize the effect.

For the given equation:

NH_4OH(s)\rightleftharpoons NH_4^+(aq)+OH^-(aq)

If an excess of ammonium salt, such as NH_4Cl (which ionizes to give NH_4^+(aq) ions)

NH_4Cl\rightarrow NH_4^++Cl^-

If the concentration of NH_4^+ that is the product is increased, so according to the Le-Chatelier's principle, the equilibrium will shift in the direction where decrease of concentration of NH_4^+ takes place. Therefore, the equilibrium will shift in the backward direction and the ions will start associating to form NH_4OH.
Decrease the concentration of OH-

Magnesium reacts with hydrochloric acid (HCl) as follows. mc025-1.jpg How many milliliters of hydrogen gas are produced by the reaction 0.020 mol of magnesium with excess of hydrochloric acid at STP? 0.448 mL 0.45 mL 448 mL 450 mL

Answers

Answer: 448 mL of hydrogen gas.

Solution:

Mg(s)+HCl(aq)\rightarrow MgCl_2(aq)_+H_2(g)

Now,according to reaction

1 mole of magnesium produces one mole of hydrogen gas.

Then 0.020 moles of magnesium will produce 0.020 moles of hydrogen gas.

Moles of H_ gas : 0.020 mol

At STP, 1 mol of gas occupies 22.4 L

So volume of 0.020 mol of H_2produced at STP :

= 22.4/times 0.020 = 0.448 L = 448 mL    (1L=1000mL)

Answer:

The answer is D 450

Explanation:

I just did the quiz

Electrons orbit around the nucleus of atoms in allowed energy states. This is the basis of the theory of which scientist?A. John Dalton
B. Niels Bohr
C. Albert Einstein

Answers

Option B. Niels Bohr's model.
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