Using the periodic table, determine which material is most likely to be a good conductor. a.sodium
b.bromine
c.carbon
d.oxygen

Answers

Answer 1

Answer:

The correct option is A.

The elements in the periodic table are arranged into groups and columns on the basis of their atomic number. Elements with similar number of electrons in their outermost shells fall in the same group of the periodic table. There are some properties of the elements that changes both in the periods and the groups of the periodic table and one of these is conductivity. Conductivity increases across period 3 from sodium to aluminium and then decrease to silicon. Thus, sodium is a good conductor of electricity.

Answer 2

Answer: Sodium is the answer

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An element X has two isotopes. X–15 has 7 protons and 8 neutrons. Determine the atomic number and mass number of the second isotope, which has 10 neutrons in its nucleus.. How would I do this and get the answer?

Answers

Answer:The atomic mass of the second isotope of an element X 17 amu with atomic number of 7 and it is represented by X-17.

Explanation:

Number of protons in isotope X-15,(p) = 7

Number of neutrons in isotope X-15,(n) = 8

Atomic mass of the isotope X-15 = (p) + (n) = 7 + 8 = 15 amu

Number of protons in second isotope of an element X,(p) = 7

Atomic number = Number of protons in an atom of an element

Number of protons in the isotopes of same element remains the same

Number of neutrons in second isotope of an element X,(n) = 10

Atomic mass of the second isotope of an element X= (p) + (n) = 7 + 10= 17 amu

The atomic mass of the second isotope of an element X 17 amu with atomic number of 7 and it is represented by X-17.

If it takes 54ml of 0.1 m naoh to neutralize 125 ml of a hcl solution with unknown concentration, what is the concentration of the hcl?

Answers

the balanced equation for the reaction between NaOH and HCl is as follows
NaOH + HCl ---> NaCl + H₂O
stoichiometry of NaOH to HCl is 1:1
number of NaOH moles reacted - 0.1 mol/L x 0.054 L = 0.0054 mol
number of HCl moles reacted = number of NaOH moles reacted
since the molar ratio of acid to base is 1:1
therefore number of HCl moles reacted - 0.0054 mol
the number of moles of HCl in 125 mL - 0.0054 mol
therefore number of HCl moles in 1000 mL - 0.0054 mol / 125 mL x 1000 mL
number of moles of solute in 1000 mL is known as the molarity concentration
concentration of HCl is 0.0432 M

Find volume of 1 mole of helium gas when the pressure is 1.46 atm and the temperature is 270k

Answers

we can use the ideal gas law equation to find the volume of He
PV = nRT
where P - pressure 1.46 atm x 101 325 Pa/atm = 147 934.5 Pa
V - volume
n - number of moles - 1 mol
R - universal gas constant - 8.314 Jmol⁻¹K⁻¹
T - temperature - 270 K
substituting these values in the equation
147 934.5 Pa x V = 1 mol x 8.314 Jmol⁻¹K⁻¹ x 270 K
V = 15.17 L
the volume is 15.17 L

Enter the molecular formula for butane, C4H10
express your answer as a chemical formula

Answers

The molecular formula for butane is c4h10, the chemical formula could be written as H3CCH2CH2CH3 I guess, are you supposed to draw it?

Which substance in the table below has the strongest intermolecular forces

Answers

Answer : Option A) HF.

Explanation : Assuming the complete question as per the attachment.

H-F bonds are formed because of hydrogen bonding between H atom and F atom and is considered to be strongest amongst the rest other options given.

As given in the table it is clear that the molar mass of HF molecule is the lowest. It shows that, when dispersion increases in the molecule molecular weight also increases.

The strongest intermolecular bonding is hydrogen bonding. The hydrogen bonding is the electrostatic bonding between hydrogen atom and any of the electronegative atoms, such as Oxygen, Nitrogen and Flourine. The strength of H-F bonding is strongest, then H-N and then H-O bond.

A piece of sodium metal can be described as

Answers

A piece of sodium metal can be described as a soft silvery white metal that is highly reactive and can sometimes cause explosions. This is the reason why it doesn't occur naturally as an isolated metal. Instead, different sodium containing compounds undergo different processes to isolate the sodium metal.

Answer:

D. a pure substance and an element.

Explanation:

IM JUST HIM

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