Gas produced from a reaction is a phase change and not a chemical change. a. True
b. False

Answers

Answer 1

Answer:

Answer: The given statement is false.

Explanation:

A chemical reaction is a reaction which brings change in chemical composition of reactants resulting in formation of new compounds which have different chemical properties.

For example, $Zn + H_(2)SO_(4) \rightarrow ZnSO_(4) + H_(2)$

So, when gas is produced in a chemical reaction then it means new compounds are formed due to breakage of old bonds and formation of new bonds.

Thus, we can conclude that the given statement gas produced from a reaction is a phase change and not a chemical change, is false.

Answer 2

Answer: False I believe.
Hope I've done my duty!

Related Questions

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A 6.00 L vessel is filled with 1.00 mole each of NH₃, N₂, and H₂. Given the following data... with a calculation of the reaction will go in order to reach equilibrium. You must support your choice
What is the percent composition of hydrogen in NH4HCO3?
Which of the following would not affect the rate of dissolution of salt in a beaker of water?a. stirring the solution b. increasing the pressure of the solution c. decreasing the size of the salt particles d. increasing the temperature of the solution
What is the correct IUPAC name for the compound NH4Cl?A. nitrogen chlorideB. nitrogen chlorateC. ammonium chlorideD. ammonium chlorate

Atomic emission spectra are produced when the light emitted by an element passes through a prism. Which of the following statements is true regarding these spectra?A. All elements produce the same atomic spectra.
B. Elements produce continuous spectra.
C. Elements produce spectra with only a few distinct lines.

Answers

Option C: elements produce spectra with only few distinct lines.

The spectra are not continuos and are different for every element. This permits to identify elements.

Final answer:

Atomic emission spectra are unique to each element and consist of distinct lines representing different energy levels.

Explanation:

The correct statement regarding atomic emission spectra is option C: Elements produce spectra with only a few distinct lines.

The spectra produced by different elements are unique to each element, meaning that they have distinct patterns of lines.
These lines represent the different energy levels that electrons can occupy within the atom.
The specific pattern of lines in an atomic emission spectrum can be used to identify the element present in a sample of unknown composition.

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Electrons located in the outermost shell of an atom are called _________ electrons. a. valence b. Border c. Octet d. rim

Answers

Valence shell (the only other answer you can really confuse this with is octet which refers to the outer electron shell of noble gases which are stable!)

Final answer:

Valence electrons are the electrons located in an atom's outermost shell. They play a critical role in chemical bonding and reactions and determine the atom's reactivity and placement in the Periodic Table.

Explanation:

The electrons located in the outermost shell of an atom are correctly referred to as valence electrons. These electrons play a crucial role in chemical bonding and reactions because they are the most distant from the atom's nucleus and thus, the most loosely bound, making them available for interactions with other atoms. For instance, when atoms interact to form a chemical bond, the valence electrons are often the ones that are shared, transferred, or involved in the bond formation. The number of valence electrons in an atom also determines the atom's reactivity and its placement in the Periodic Table.

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The depictions of ionic compounds do not show distinct compound units but rather a collection of ions in the ratio given by the formula. Explain how the drawing of NaCl both illustrates that the compound exists as a large collection of ions and that the ratio of sodium ions to chloride ions is 1-to-1 as indicated by the formula NaCl.

Answers

Answer:

The ionic compound NaCl has a Face Centered Cubic unit cell

The site for atoms are Face, center and Edges corner.

Effective number of atoms

Na+

1centers + 12edges x $(1)/(4)$ = 4 Na+

Cl-

6face x $(1)/(2)$ + $(1)/(8)$ x8 corners = 4Cl-

This is just one unit cell effective atom, there are thousand's of such unit cells are combined to form one such structure of NaCl. The real formula of NaCl is Na4Cl4 but for simplicity we use empirical formula that is NaCl.

All of the following are part of the digestive system except the __________.Select one of the options below as your answer:a. stomach
b. esophagus
c. intestines
d. heart

Answers

D. HeartThe esophagus pushes the food from your mouth to your stomach which digests your food and sends it into the small intestine for even further digestion. The heart has nothing to do with this process of digestion. It pumps blood through your body in the circulatory system

d. heart is the correct answer because heart is a part of circulatory system~

propose a mathematical equation to calculate tje charge on an ion from the number of protons and electrons in an ion.

Answers

If the ion is a cation, it has a positive charge because it LOST electrons. If its an anion, then it has a negative electron because it GAINED electrons.

6. when multiplying and dividing measured quantities, the number of significant figures in the result should be equal to the number significant figures in___. a) all of the measurements b) at least and most precise measurements c) the most precise measurement d) the least precise measurement

Answers

The correct option is D.

Significant figure refers to the number of digits that are used to report a measured quantity. The amount of a significant number in a measurement always equal to the number of digits that are known with some degree of confidence and the last number, which is usually an estimate. When carrying out calculations with significant figures measurements, one must be careful to report the number of significant figure to reflect the least precise measurement.

The least precise measurement.

When figuring out how many significant figures to go to, you always use the least amount of sig figs in the question so the least sig figs means the least precise.

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