CHEMISTRY HIGH SCHOOL

According to the periodic table, which two elements are in the same row?A. nitrogen and antimony
B. francium and platinum
C. rubidium and zinc
D. barium and mercury

Answers

Answer 1
Answer: D. Barium and Mercury

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Eric notices that his flashlight does not turn on when he flips the switch. What is the least appropriate hypothesis for Eric to make?

Answers

there is a loose circut

In which of these substances are the molecules probably moving most quickly?solid iron at −45°C
solid iron at 300°C
liquid iron at 1600°C
liquid iron at 1800°C

Answers

The substance with molecules that are probably moving most quickly is liquid iron at 1800°C. This is because the particles of the liquid iron can move or slide past each other due to the small space available for movement. It cannot be compressed further due to the repulsive forces that acts between them. And also, the temperature is increases which causes for more thermal vibration of atoms.

Answer:

The answer is D

Explanation:

Please answer. Brainliest!

Answers

Answer:

The equation is balanced.

Explanation:

The number of P atoms in the reactant side is 4 and the number of P atoms in the product side is also 4.

The number of O atoms in the reactant side is 16 and the number of O atoms in the product side is also 16.

The number of H atoms in the reactant side is 12 and the number of H atoms in the product side is also 12.

These results are in accordance with the law of conservation of mass.

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Which element is a liquid at STP?
(1) argon (3) chlorine
(2) bromine (4) sulfur

Answers

Answer: Option (2) is the correct answer.

Explanation:

STP means standard temperature and pressure.

At STP chlorine exists as a gas, sulfur exists as a solid and argon also exists as a gas.

Whereas bromine exists as a liquid at STP.

Thus, we can conclude that out of the given options bromine is the element which exists as a liquid at STP.

The element that is a liquid at standard temperature and pressure (STP) is bromine (Br). Therefore, option 2 is correct.

Bromine is the only element among the options given that is a liquid at STP. It is a reddish-brown liquid with a strong and unpleasant odor. Bromine is a halogen and exists as diatomic molecules (Br₂).

It has a boiling point of 58.8°C (137.8°F) and a melting point of -7.2°C (19.0°F). Bromine is significantly more reactive than argon but less reactive than chlorine and sulfur.

Argon (Ar) is a noble gas and exists as a colorless and odorless gas at STP. Chlorine (Cl) is a greenish-yellow gas at STP. Sulfur (S) is a solid at STP and melts at a relatively high temperature.

To learn more about the element, follow the link:

brainly.com/question/31950312

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The Kw of water varies with temperature. Calculate the pH of water at 46⁰C with a Kw = 1.219 x 10-14. Show all calculations leading to an answer.

Answers

Kw is equal to the concentration of the H+ and the OH-. In pure water, the concetration of H+ and the OH- is equal. In computing for the pH of water, we tke the negative log of the concentration of H+. To solve the concentration of H+ we take the square root of the Kw (Since Kw=[H+]*[H+] since [H+]=[OH-]) 
H+ is equal to 1.104*10^-7
negative log of the H+ conc. or the pH is 6.96 (pH = -log(1.104*10^-7))

The answer is valid and is close to the neutral pH which is 7. 

A tire at 21°C has a pressure of 0.82 atm. Its temperature decreases to –3.5°C. If there is no volume change in the tire, what is the pressure after the temperature change?

Answers

Using ideal gas equation, PV = nRT, and since there is no volume change and amount change, the equation is now P = kT, where k =nR/V. Temperature must be in kelvin From the given, k = (0.82)/ (21 + 273) = 2.78 x 10^-3 Substituting T = -3.5+273, P = 0.75 atm

it would be 0.75 atm
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