All categories

4 years ago

PLEASE HELP WITH ALL

Chemistry

2 answers:

Tpy6a [65]4 years ago

7 0

Answer:

Question 1: Correct 3 and 4

Question 2: All can be corrected except item 2.

Question 3: Correct 1

Question 4: Correct 1

Question 5: Correct 1

Explanation:

Question 1: The law of conservation of mass explains that “In an isolated system, during any ordinary chemical reaction, the total mass in the system remains constant, that is, the mass consumed of the reagents is equal to the mass of the products obtained”, therefore, statements 3 are correct, which tells us that we must begin and end with the same amount of matter, and 4, since we cannot create or destroy matter.

Question 2: When a chemical reaction occurs, according to the initial compounds (reagents), it can be seen in various ways how a change in the system occurs, which indicates that a chemical reaction occurred, many of them can be identify with our senses (change of color, change of temperature, change of state of aggregation of the reagents, etc.), it is clear that they do not have problems that have all these statements together, with which of these happen, we could affirm that it had a chemical reaction.

On the other hand, changes that can be easily undone (affirmation 2) are more related to physical phenomena, in which the intimate composition of matter (such as a change of state) does not vary, a difference in chemical reactions .

Question 3: When a chemical reaction occurs, the substances that are initially found (reagents) change the intimate structure of matter, breaking and / or forming bonds of the compounds to form new bonds, and thus, new substances (products). That is why the correct statement is 1, in the case of the other statements, physical phenomena are being described, in which there are no breaking of bonds in the initial compounds to form new substances, simply, state changes occur in matter, but no new compounds are formed.

Question 4: In changes of state, there are no changes in the intimate structure of matter, so they are physical phenomena. The only thing that varies in the changes of state of matter, is the kinetic energy with which the particles of the system move, due to the variation in temperature.

Question 5: Unlike physical reactions, in chemical reactions there are bond ruptures and / or rearrangement of atoms of the initial compounds (reagents) to form new bonds and structures, and thus, new compounds (reaction products). In addition, these reactions comply with the law of conservation of mass, so that matter cannot be created or destroyed, as well as energy.

Gala2k [10]4 years ago

5 0

Answer:

Question 1: D

Question 2: B C E F

Question 3: A

Question 4: A

Question 5: A

You might be interested in

Now consider the reaction A+2B⇌C for which in the initial mixture Qc=[C][A][B]2=387 Is the reaction at equilibrium? If not, in w

hram777 [196]

To answer this question Kc of this reaction OR the conc of reactants nd products at equilibria is required.

Explanation:

8 0

4 years ago

Which element is a metalloid?

kari74 [83]

Hi , the answer is silicon.

3 0

4 years ago

What property did mendeleev use to organize his periodic table?

Over [174]

<h2>Answer:</h2>

Mendeleev grouped elements with similar chemical properties (especially valency) together and noted their mass as well. At first he only wrote down 9 elements:

Cl 35.5, K 39, Ca 40

Br 80, Rb 85, Sr 88

I 127, Cs 133, Ba 137

He added more elements to his first period table little by little, putting them into groups by valency and sorting them within their group by mass. He noted that the mass in most cases also increases by group within a period.

On 6 March 1869, he presented his work "The Dependence between the Properties of the Atomic Weights of the Elements" for the first time. It stated that:

The elements, if arranged according to their atomic weight, exhibit an apparent periodicity of properties.

Elements which are similar regarding their chemical properties either have similar atomic weights (e.g., Pt, Ir, Os) or have their atomic weights increasing regularly (e.g., K, Rb, Cs).

The arrangement of the elements in groups of elements in the order of their atomic weights corresponds to their so-called valencies, as well as, to some extent, to their distinctive chemical properties; as is apparent among other series in that of Li, Be, B, C, N, O, and F.

The elements which are the most widely diffused have small atomic weights.

The magnitude of the atomic weight determines the character of the element, just as the magnitude of the molecule determines the character of a compound body.

5 0

2 years ago

Atoms are the smallest unit of an element that holds the physical identity of that element T or F

Amanda [17]

Answer:

I think it might the answer might be true, im sure you can find this in online tho

8 0

3 years ago

What is the measure if how much space an object takes up? A. Mass B. Density C. Weight D. Volume

givi [52]

Answer:

volume

Explanation:

8 0

3 years ago

Read 2 more answers