Of the elements fe li te u and he which are considered group b elements

Answers

Answer 1

Answer:

Answer: Iron is considered as a Group B element.

Explanation:

Mendeleev divided the periodic table into 8 groups, each divided into two sub-groups named as A and B. He arranged the elements according to their atomic masses.

Group A elements are considered as the elements which are present in s-block and p-block.

Group B elements are the transition elements. Transition elements are the elements that belong to d-block.

From the given elements:

Lithium (Group 1-A) and helium (Group VIII-A) are s-block elements.

Tellurium is a p-block (Group VI-A)element.

Uranium is a f-block element.

Iron is the d-block (Group VIII-B)element (transition element)

Hence, iron is considered as a Group B element.

Answer 2

Answer: only fe (iron) is in the group b of elements

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Which process results in the release of energy stored in the products of photosynthesis?A. polymer synthesis

B. depolymerization

C. digestion

D. cellular respiration

Answers

Answer: Cellular Respiration

Explanation:

The cellular respiration can be defined as the biological process by which the organism get energy to do work or to perform the various metabolic processes of the body.

The glucose produced by the plants is utilized in the process of cellular respiration where the glucose is broken down in pressence of oxygen to provide energy for various body functions.

The correct answer would be the letter D, Cellular respiration.

Cellular respiration allows the production of ATP through the breakdown of glucose assisted by oxygen. We talk about aerobic metabolism. This metabolism is to oppose the fermentation which is done without oxygen (anaerobic) and that we detail in another file. Cellular respiration is divided into two phases, one cytoplasmic and the other mitochondrial.

To titrate 15.00 milliliters of an unknown HCl sample, use 25.00 milliliters of a standard 0.2000 M NaOH titrant. What is the molarity of the HCl

Answers

Answer:

Molarity of HCl = 0.3333M

Explanation:

Given:

Volume of HCl = 15.00 ml

Volume of NaOH = 25.00 ml

Molarity of NaOH = 0.2000 M

To determine:

Molarity of HCl

Explanation:

The titration reaction is:

$HCl + NaOH \rightarrow NaCl + H2O$

Based on the reaction stoichiometry:

1 mole of HCl reacts with 1 mole of NaOH to form 1 mole of NaCl and water.

Therefore the molar ratio of HCl:NaOH = 1:1

$Molarity = (Moles)/(Volume(L))$

$Moles(NaOH)=0.2000moles/L*0.025 L = 0.005moles$

Moles of NaOH consumed = Moles of HCl present = 0.005 moles

$Molarity(HCl)=(Moles)/(Volume)=(0.005moles)/(0.015L)=0.3333M$

Using Formula M1V1=M2V2

HCl+NaOH -> NaCl + H2O
1:1 ratio

M1=Molarity of HCl = X
V1 = Volume of HCl = 15mL = 0.015L

M2 = Molarity of NaOH = 0.2M
V2 = Volume of NaOh = 25mL = 0.025L

(XM)(0.015L)=(0.2M)(0.025L)
Isolate unknown:
(XM)=[(0.2M)(0.025L)/(0.015L)]
XM=0.33M

Hence, Molarity of HCl is = 0.33 Moles

According to the following reaction, how many moles of carbon monoxide will be formed upon the complete reaction of 23.1 grams of benzene (C6H6) with excess oxygen gas?benzene (C6H6) (l) + oxygen (g) carbon monoxide (g) + water (g)

Answers

The balanced chemical reaction is:

C6H6 + 9/2O2 = 6CO + 3H2O

We are given the amount of benzene to be used for the reaction. This will be the starting point for the calculations.

23.1 g C6H6 ( 1 mol C6H6 / 78.12 g C6H6 ) ( 6 mol CO / 1 mol C6H6 ) = 1.77 mol CO is produced from the reaction

How do molecules move to the location of the chemical change

Answers

In a chemical change, the molecules in the reactants interact to form new substances. In a physical change, like a state change or dissolving, no new substance is formed.

hope this helped

Final answer:

Molecules move to the location of a chemical change due to the process of diffusion. In this physical phenomenon, molecules move from an area of high concentration to an area of lower concentration. This diffusion leads to interaction between reactant molecules causing the chemical change.

Explanation:

The movement of molecules to the location of a chemical change is a fundamental concept in Chemistry. In a chemical reaction, molecules move due to a physical phenomenon known as diffusion. Diffusion is the process by which molecules of a substance move from an area of high concentration to an area of lower concentration. For example, if you open a perfume bottle at one end of a room, eventually the perfume molecules will spread throughout the room. These perfume molecules move to areas of lower concentration via diffusion. In the context of a chemical reaction, the reactant molecules diffuse to interact with each other, leading to the chemical change or reaction.

Learn more about Diffusion here:

brainly.com/question/33319237

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Calculate the mass percent composition of sulfur in Al2(SO4)3.

Answers

The molar mass of aluminum sulftae is 342.14 g/mol.

Since the subscript shows that there are 3 sulfurs within the substance, the total mass of sulfur is 96.21g/mol

Now take the mass of the sulfur and divide it by the molar mass of aluminum sulfate, then multiply by 100:
(96.21/342.15)(100) = 28.1% mass composition of sulfate

Which of the following is not found in the nucleus of an atom? A. Neutron
B. Electron
C. Proton
D. Quark

Answers

Electron - In an atom, the central part which is composed of neutrons and protons including quarks is called the nucleus. Whereas the electron is the particle with negative elementary electric charge can be found inside the atom surrounding the nucleus.

Answer: electrons

Explanation:

because it is

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