why the total mass of the products would be less than the total weight of the reactant after a chemical reaction?

Answers

Answer 1
Answer: The best explanation would be that Gases were released during the Chemical reaction, causing a loss of Mass. 

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What does Bi+3H2O+ Bi2O3+3H2 represent

Answers

I believe this is the answer

Beverly and Carl are in a race. Their graphs show the data Which best describes the race?A. Even though for a majority of the race they accelerated at the same rate, Carl won because his initial acceleration was greater than Beverly’s
B. Even though for a majority of the race they accelerated at the same rate, Beverly won because her initial acceleration was greater than Carl’s.
C.Beverly accelerated at a greater rate for the entire race.
D. Carl accelerated at a greater rate for the entire race

Answers

The correct option is B.

Acceleration is defined as the rate of velocity of a body per unit time; that is, acceleration is given by the ratio of velocity and time. Looking at the graph given above, it can be seen that, the two runners started with different initial velocity; Beverly started with the initial velocity of 15 m/s while Carl started with the initial velocity of 10 m/s. For the rest of the race, the two runners maintains similar acceleration but Beverly won because her initial velocity was higher.

The correct answer is B
i just finished the test. hope this helps

The cell wall is a rigid structure that surrounds plant cells. The materials found in the cell wall protect the plant cells and give plants structural support.Which conclusion can be made given the above information?
The structures of different types of cell organelles are similar.

The functions of most cell organelles are hindered by their structures.

The structure of a cell organelle is directly related to its function.

The function of a cell organelle can change over time.

Answers

Answer:

The correct answer will be option- The structure of a cell organelle is directly related to its function.

Explanation:

The cell wall is a layer formed around the plasma membrane of the plant cell which helps plant cell by providing stiffness and support to the cell. This cell wall provides protection to the plant cells.

Since the presence of cell wall around the plasma membrane shows that it has a specific function and serves an important function of the plant cell, similarly the structure of various organelles present in the cell is related to their function. The best-known example is the inner folding of the mitochondria called cristae to increase the surface area.

Thus, the selected option is the correct answer.

The structure of a cell organelle is directly related to its function because for example, us. Humans have cells throughout their body. In fact, these cells are all the same. But these cells don't perform the same tasks or else we wouldn't be able to walk, sleep, talk, breath, and bend the way we do.

Identify the spectator ions in this reaction. Check all that apply. 2H+ + CrO4– + Ba2+ + 2OH– Ba2+ + CrO4– + 2H2O H+ CrO4– Ba2+ OH– 2H2O

Answers

Answer: CrO₄⁻ and  Ba²⁺


Explanation:


1) Chemical equation given:


2H⁺ + CrO₄⁻ + Ba²⁺ + 2OH⁻ → Ba²⁺ + CrO₄⁻ + 2H₂O


2) Analysis


That is an oxidation-reduction equation (some species are been oxidized and others are being reduced).


The given equation is known as total ionic equation, because it shows all the species as ions that are part of the reaction.


2) Specator ions


Spectator ions are the ions that do not change their oxidation state and are easily identified as they are the same in the reactant and product sides.


Here the ions that are the same in the reactant and product sides are:

CrO₄⁻ and  Ba²⁺


3) Addtitional explanation.


Once you identify the spectator ions you can delete them from the equation to obtain the net ionic equation , which in this case turns to be:


2H⁺ + 2OH⁻ →  2H₂O


But this is  not part of the question; it is some context to help you understand the use of the spectator ions concept.

Answer: B and C on the tenth question of the assignment

Is texture physical or chemical

Answers

physical, chemical is what makes up the substance, physically is how it appears

Final answer:

Texture is a physical property that refers to the feel or consistency of a substance. It is determined by the arrangement and size of the particles that make up the substance. Texture is observed and described without any chemical changes occurring in the substance.

Explanation:

Texture

Texture is a physical property, not a chemical property. It refers to the feel or consistency of a substance or material. In chemistry, texture is often used to describe the physical characteristics of solids, liquids, and gases.

For example, when we describe a substance as being rough, smooth, soft, or hard, we are talking about its texture. Texture can be observed and described without any chemical changes occurring in the substance. It is determined by the arrangement and size of the particles that make up the substance.

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The periodic table has undergone some changes since it was first introduced. List three ways the modern periodic table differs from the one first published by Mendeleev in 1869.I have two of the three ways:
1: updating the atomic weight
2: adding newly discovered elements

However, I cannot come up with a last way the modern periodic table differs from Mendeleev's. Please help (:

Answers

One of the differences I can think of is that hydrogen is no longer listed as a group I element.

According to the mendeleev tables that I looked up, hydrogen is catorgrized as a group I element, along with Lithium, sodium, Potassium etc. However, nowadays, hydrogen does not belong to any groups in the periodic table. This is because there are arguments about whether hydrogen belongs to group I. Group I elements are all alkali metals, while hydrogen is not. However, some people says that hydrogen only have one outer shell electron so it should be in group I. Some people even say hydrogen should belong to group VII because it only needs one more electron in order to achieve the duplet of electrons.

Therefore as you may notice, hydrogen in modern periodic tables are put in the center of the periodic table on the top.

Final answer:

The modern periodic table differs from Mendeleev’s original version in three main ways: it includes updated atomic weights, has been expanded to include newly discovered elements, and arranges elements by atomic number rather than atomic weight.

Explanation:

The modern periodic table of elements indeed differs in several key ways from the original 1869 version developed by Dmitri Mendeleev. Firstly, as you've noted, it has been updated to include the correct atomic weights of elements. Secondly, it has been expanded to include all of the newly discovered elements that weren't known in Mendeleev's time. And thirdly, elements on the modern periodic table are now arranged according to their atomic number (the number of protons in an atom's nucleus), rather than their atomic weight as was initially the case with Mendeleev's version. This change reflects a deeper understanding of atomic structure that has developed since the 19th century.

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