Why are bubbles seen in the small test tube?

Answers

Answer 1

Answer: Due to Chemical reaction

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Under which conditions of temperature and pressure would helium behave most like an ideal gas?(1) 50 K and 20 kPa (3) 750 K and 20 kPa
(2) 50 K and 600 kPa (4) 750 K and 600 kPa

Answers

Answer : The correct option is, (3) 750 K and 20 kPa

Explanation :

The conditions for ideal gas are :

Ideal gas are those gas that has no intermolecular attractions.

Ideal gas are those gas that have negligible volume.

The ideal gas equation is,

$PV=nRT$

The conditions for real gas are :

Real gas are those gas that have intermolecular attractions.

Real gas are those gas that have volume.

The real gas equation is,

$(P+(an^2)/(V^2))(V-nb)=nRT$

A real gas behave ideally at high temperature and low pressure condition.

From the given options, option (3) have high temperature and low pressure is the correct option.

Hence, at 750 K and 20 kPa conditions of temperature and pressure does a sample of helium behave most like an ideal gas.

Which term identifies a type of nuclear reaction?A) transmutation
B) neutralization
C) deposition
D) reduction

Answers

A nuclear reaction is B) Neutralizer.

Describe the measurements necessary to find the average speed of a moving train

Answers

Answer:

use the rule of speed

Explanation:

speed =distance over time

Describe how rows and columns in the modern periodic table are organized

Answers

They are organized by their atomic number

What is the IUPAC name for the compound FeS?(1) iron(II) sulfate (3) iron(II) sulfide
(2) iron(III) sulfate (4) iron(III) sulfide

Answers

The correct answer is option 3. The IUPAC name is Iron(II) sulfide. It is the less stable amorphous form. When this is powdered, it is pyrophoric or it ignites spontaneously in air. It readily reacts with hydrochloric acid producing hydrogen sulfide.

The IUPAC name for the compound FeS is "iron(II) sulfide." Therefore, option 3 is correct.

The IUPAC (International Union of Pure and Applied Chemistry) name is a systematic way of naming chemical compounds.

The compound FeS consists of iron (Fe) and sulfur (S) atoms. In FeS, iron has a +2 oxidation state, and sulfur has a -2 oxidation state.

According to the IUPAC nomenclature rules for naming inorganic compounds, the cation (iron) is named first, followed by the anion (sulfide).

To indicate the oxidation state of iron, the Roman numeral II is used in parentheses after the name "iron." The resulting name is "iron(II) sulfide."

To learn more about IUPAC, follow the link:

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Which of the following is the most recent addition to the accepted model of the atom?Atoms are indivisible particles.
Protons are located in the nucleus.
Electrons form a cloud around the nucleus.
Neutrons orbit the nucleus along circular paths.

Answers

I think the best answer for this question is the third option. Electrons form a cloud around the nucleus. According to modern physics, electrons are in constant motion around the nucleus and protons. Additionally, electrons, protons and neutrons are considered as hard particles.

Answer:

its c because i took the test

Explanation:

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