CHEMISTRY HIGH SCHOOL

The proper technique used to obtain a liquid sample using a pipette involves: Group of answer choices your mouth on one end of the pipette to suction the sample. a suction bulb or pipette pump to suction the sample. a funnel on one end of the pipette to add the sample. a small glassware to pour the liquid in one end of the pipette. the vacuum hose on one end of the pipette to suction the sample.

Answers

Answer 1
Answer:

Answer:

A suction bulb or pipette pump to suction the sample.

Explanation:

There are different types of pipettes that can be used in a laboratory:

  • Volumetric pipette-used to transfer a specific calculated amount of liquid
  • Graduated pipettes-used to transfer different calculated amounts of liquid from one container to another.
  • Micropipettes-used to transfer small amounts of liquids
  • Pasteur pipettes- just like micropipettes, pasteur pipettes are used to transfer small amounts of liquids, but manually. They are also called droppers.

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As carbon dioxide sublimes, its entropy
(1) decreases (2) increases (3) remains the same

Answers

Answer: (2) increases

Explanation: Entropy is the measure of randomness or disorder of a system. More is the random arrangement of molecules in a system , more is the entropy of the system. More ordered is the arrangement of molecules in a system, less is the entropy of the system.

When carbon dioxide sublimes, it means solid carbon dioxide is directly changing to gaseous state without undergoing into liquid state, thus the molecules will be more random and thus the entropy will increase.
When something sublimes (Goes straight from solid to gas), it takes in energy, as it is an endothermic process, so its entropy increases

Which is a possible explanation for why metals would be reactive

Answers

Answer: The reactivity of a metal depends on how easily it loses electrons

The reactivity of metals is due to the difference in stability of their electron configurations as atoms and as ions. As they are all metals they will form positive ions when they react.

A nuclear fission reaction and a nuclear fusion reaction are similar because both reactions(1) form heavy nuclides from light nuclides
(2) form light nuclides from heavy nuclides
(3) release a large amount of energy
(4) absorb a large amount of energy

Answers

Both reactions release a large amount of energy is the statement that is correct about the similarity between a nuclear fission reaction and a nuclear fusion reaction.

A nuclear reaction is a procedure that leads to combining and modifying the nuclei of atoms, absorbing or releasing particles and energy according to each case.

  • When nuclei fragment, the reaction is known as nuclear fission, which releases energy.

  • The reaction that occurs when two light atomic nuclei join together is known as nuclear fusion, generating a heavier nucleus and releasing a large amount of energy.

Therefore, we can conclude that while in a fusion reaction two or more light nuclei unite, in a fission reaction a heavy nucleus breaks, both cause the release of energy.

Learn more about nuclear reactions here: brainly.com/question/14019172

Answer: (3) release a large amount of energy

Explanation:

Nuclear fusion is a process which involves the conversion of two small nuclei to form a heavy nuclei along with release of energy.

4_1^1\textrm{H}\rightarrow _2^4\textrm{He}+2_(+1)^0\textrm{e}+\text{energy}

Nuclear fission is a process which involves the conversion of a heavier nuclei into two or more small and stable nuclei along with the release of energy.

_(92)^(235)\textrm{U}+_0^1\textrm{n}\rightarrow _(56)^(143)Ba+_(36)^(90)Kr+3_0^1\textrm{n}+\text{energy}

Thus in the both the reactions energy is released.

What is the formula mass for fe(no3)3

Answers

Calculando a massa molar (molar peso) Para Calcular a massa molar de hum Composto químico, ponha SUA fórmula E clique em 'Calcular'. Na Fórmula química that rápido Você PODE USAR: QUALQUÉR elemento químico Grupos Funcionais: D, Ph, Me, Et, Bu, AcAc, Para, Ts, Tos, Bz, TMS, tBu, Bzl, Bn, Dmg PARENTESIS () UO colchetes [] . Nomes Comuns de Compostos. Os Exemplos de Cálculos de Massa molar:  NaCl ,  o Ca (OH) 2 ,  K4 [Fe (CN) 6] ,  CuSO4 * 5H2O ,  água ,  ácido nítrico ,  permanganato de potássio ,  etanol ,  frutose . Peso Computação molecular (massa molecular) para calcular o peso molecular de um composto químico entrar em sua fórmula, especifique seu número de massa isotópica depois de cada elemento entre colchetes. Os Exemplos de Cálculos de peso molecular: C [14] o [16] 2 , S [34] O [16] 2 . Definição de massa molecular, o peso molecular, uma massa molar e do peso molar Massa molecular ( peso molecular ) e uma massa de uma molécula de uma substancia e e Expressa nsa unificadas unidades de massa atómica (u). (1 u E igual a 1/12 da massa de hum átomo de carbono-12) Massa Molar ( molar peso ) E uma massa de Uma toupeira de Uma substancia ê ê expresso em g / mol. Pesos dos Átomos e isótopos São de NIST Artigo . DEIXE Seu comentário Sobre a SUA Experiência com uma calculadora de Peso Molecular Pesos moleculares de Aminoacidos: Relacionados
   
The formula mass of fe(no3)3 is179.87.

What is the correct way to show carbon dioxide in the gas phase?a. CO (g)
b. CO2 (g)
c. CO2 (s)
d. CO2 (gp)

Answers

The correct way of showing carbon dioxide in the gas phase is b. CO2 (g)

This notation is commonly used in showing chemical reactions wherein the phases of the constituents are important. Gases are denoted by (g), solids are denoted by (s), and liquids are denoted by (l). Aqueous solutions are also denoted (aq).

The sturdy wall outside of a skyscraper could be most easily compared to Question 14 options:

A cell membrane


B mitochondrion


C chloroplast


D cell wall

Answers

I think the answer is A because the job of a cell membrane is to provide protection to the plant. A cell membrane has a sturdy wall.
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