The force most responsible for holding the nucleus of an atom together is the:

Answers

Answer 1

Answer: Strong nuclear force. I think that's the one one that holds the nucleons together.

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Would the two as yet undiscovered elements A+1 and D+2 react?

Answers

Answer: No, the given elements will not react.

Explanation:

Ionic bond is defined as the bond which is formed from the complete transfer of electrons from one atom to another atom. The atom which looses electrons is known as electropositive atom and it attains positive charge. The atom which gains electrons is known as electronegative atom and it attains negative charge. For Example: KBr

Covalent bond is defined as the bond which is formed by the sharing of electrons between the atoms forming a bond. No ions are present in the compound. For Example: HCl

We are given, two elements with their oxidation states:

$A^+\text{ and }D^(2+)$

As, both the ions are positive ion and thus, will not react to form any compound because like charges repel each other.

Hence, no, the given elements will not react.

The best answer is no bc the question ask "Would the two as yet undiscovered element A+1 and D+2" don't sound right

A disadvantage of solar energy is the need for?

Answers

A disadvantage of solar energy is that solar power cannot be created during the night since the sun doesn't shine 24 hours. Also, the production of energy is decreased during cloudy days. Solar energy uses the light from the sun to create energy.

a supplemental heating unit for cloudy days, winters, and nighttimes

Which of the following reactions show a decrease in entropy? a. CaO(s) + H2O(l) Ca(OH)2 (s) b. 2H2O (l) 2 H2 (g) + O2 (g) c. H2CO3 (aq) CO2 (g) + H2O (l) d. 2KClO3 (s) 3O2 (g) + 2KCl (s)

Answers

The correct answer is a. CaO(s) + H2O(l) Ca(OH)2 (s)
Decreasing in entropy means that you have to get a solid from the liquid
therefore : CaO(s) + H2O(l) Ca(OH)2 (s)
This formula will make it absolutely clear
$(g) -\ \textgreater \ (l) -\ \textgreater \ (s) more molecules -\ \textgreater \ less molecules$

Answer: The correct answer is Option a.

Explanation:

Entropy is defined as the measurement of randomness in a system.

Entropy increases as we move from solid state to liquid state to gaseous state and it decreases as we move from gaseous state to liquid state to solid state.

From the options above:

Option a: $CaO(s)+H_2O(l)\rightarrow Ca(OH)_2(s)$

Entropy is getting decreased because liquid reactants are changing its state to solid state.

Option b: $2H_2O(l)\rightarrow 2H_2(g)+O_2(g)$

In this reaction, entropy is increasing because the state is changing from liquid to gaseous state.

Option c: $H_2CO_3(aq.)\rightarrow CO_2(g)+H_2O(l)$

In this reaction, entropy is increasing because the state is changing from liquid to gaseous state.

Option d: $2KClO_3(s)\rightarrow 3O_2(g)+2KCl(s)$

In this reaction, entropy is increasing because the state is changing from solid to gaseous state.

Hence, the correct answer is Option a.

Which type of molecule is produced during photosynthesis A.monosaccharide
B.triglyceride
C.protein
D.Polypeptide

Answers

Answer

monosaccharide

Explanation

Which one of the following equations is not balanced?6H2O + 6CO2 ---> C6H12O6 + 6O2
C7H16 + 11O2 ---> 7CO2 + 8H2O
PCl2 + 4H2O --->H3PO4 + 5HCL
Fe3O4 + 4H2 ---> 3Fe + 4H2O

Answers

The key inthe balancing of chemical reaction is to make sure that you got the exactchemical formula of the substance that is reacting and the yielded product.After getting the formula, identify first the hardest element/atom to bebalanced such as Na, Zn, Cl, C, O, etc. Then proceed to the easier ones such asO, H. Make sure to note the atoms present in the molecule of the substance. Amongthe three equations, PCl2 + 4H2O --->H3PO4 + 5HCL is not balanced. Thehardest element here is the Cl. Observe that there are 5Cls in the product sideso you must add 5 to the PCl2. However, there are only 2Cl atoms and it needs3 to balance the equation. Also, there is no P in the product side. This equationis invalid.

The third one is incorrectly balance because the are only two chlorine on the reactant side and five on the product side. The correct balanced equation is 2PCL2 + 8H2O -> 2H3PO4 + 5H2 + 4Cl. The reason HCl is broken into two parts is because it is a strong acid and would immediately dissolve if put together.

How are science and technology related?A. Technology is a branch of natural science.
B. Science is a branch of technology.
C. Advances in science may lead to advances in technology and vice versa.
D. Science and technology are not related

Answers

It's not A because technology is a branch of applied science. It's not B because again, technology is a branch of science, not the other way around. It's not D because they are related with one being a branch of another. Therefore, it has to be C because scientific advances do lead to technological advances.

C. Advances in science may lead to advances in technology and vice versa is the correct answer~

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