What do elements and compounds have in common? And how do they differ?I will mark brainliest for the best answer.

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Answers

Answer 1

Answer: elements and compounds might appear different, yet they share many similarities, like being made up of atoms and having bonds linking their atoms together. Elements and compounds also share the qualities of being both pure and homogeneous substances. Substances can be categorised as either elements or compounds. Both of these are made up of atoms, the only difference is an element is made of one type of atom whereas compounds are made of two or more different types of atoms.

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Which statement is true about the use of radiation to treat cancer?Only weak X-rays can be used.
Only powerful X-rays can be used.
Only beta particles can be used.
Only alpha particles can be used.

Answers

The statement that is true about the use of radiation to treat cancer is that only powerful X-rays can be used. The radiation used for cancer treatment is known as ionizing radiation. These forms ions in the cells which could kill or stop them from growing. This type of radiation is have more energy than radio waves, microwaves and visible light.

Answer:

Only powerful x-rays can be used

Explanatijust did it and read it

Which of the following is untrue concerning a reversible reaction?a. All reversible reactions will reach equilibrium.
b. The reaction always spends equal time in the forward and reverse direction.
c. There is equal processing for the concentration of reactants and products.
d. The reaction could spend more time in the reverse direction than in the forward direction.

Answers

The statement that is untrue concerning a reversible reaction is The reaction always spends equal time in the forward and reverse direction. The answer is letter B. The reset of the statements are true concerning the reversible reaction.

Which ion is the only negative ion produced by an Arrhenius base in water?(1) NO3– (3) OH–
(2) Cl– (4) H–

Answers

The correct answer is option 3. It is the hydroxide ions that is produced by an Arrhenius base in water. According to Arrhenius, acid-base reactions are characterized by acids which forms hydronium ions in water and bases which dissociates in aqueous solution to form hydroxide ions.

What are chemical reactions?

Answers

2 elements or more sharing/gaining/losing to each other for a result of full outer shells of electrons of each element to become noble gases.

chemical reactions are reactions that make chemical changes to a type of something. sometimes its physically seen as well.
yw

What is the mass percent of sodium in NaCl?

Answers

The mass percent of sodium in NaCl can be determined by dividing the mass of sodium by the total mass of the compound (NaCl), then multiplying the result by 100. So, 39.34% of the mass of sodium in NaCl is composed of sodium.

The molecular weight of chlorine (Cl) is 35.45 g/mol while that of sodium (Na) is 22.99 g/mol.

The molecular weight of NaCl is calculated as follows:

Na: 1 atom * 22.99 g/mol = 22.99 g/mol
Cl: 1 atom * 35.45 g/mol = 35.45 g/mol

Total molecular weight = 22.99 g/mol + 35.45 g/mol = 58.44 g/mol

To determine the sodium mass percent in NaCl:

(mass of sodium / total mass of NaCl) * 100 to get the mass percent of sodium.

(22.99 g/mol / 58.44 g/mol) x 100 = 39.34% sodium mass percent

As a result, 39.34% of the mass of sodium in NaCl is composed of sodium.

Learn more about Mass percent, here:

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mass percent of sodium is mass of sodium divided by total mass of NaCl then multiplied by 100%. That means that percent mass equals (23g/58.45g)×100% which equals 39.3%.
Therefore the percent mass of sodium in NaCl is 39.3%
I hope this helps. Let me know if anything is unclear.

What is the energy of a 3.12 x 10^18 s-1 wave?A. 4.75 x 10 ^42 J
B. 5.74 x 10^-7 J
C. 2.07 x 10 ^15 J
D. 8.6 x 10 ^ 4 J

Answers

Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The energy of wave is 2.08×10⁻¹⁵J.

What is electromagnetic wave?

Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave .There is a relation between energy of wave. frequency of wave

Mathematically,

E=hv

where,

E = energy of electromagnetic wave

h is planks constant having value 6.67×10⁻³⁴js

v= frequency of wave

substituting the given values

E= 6.67×10⁻³⁴js×3.12 x 10¹⁸ s⁻¹

E= 2.08×10⁻¹⁵J

Therefore the energy of wave is 2.08×10⁻¹⁵J.

To know more about electromagnetic wave, here:

brainly.com/question/12289372