What properties are attributed to a solid with the type of bonding represented in the picture?
a)
low melting point

b)
good conductor of electricity and heat

c)
high volatility

d)
brittle
when describing metallic bonding, scientists note that the metal ions seem to be floating in a sea of electrons. this arrangement contributes to the physical property of in metals.

a)
luster

b)
ductility

c)
malleability

d)
conductivity
carbon and fluorine combine covalently to form a binary compound. what is the formula of the compound with the name carbon tetrafluoride?

a)
c4f

b)
c4f4

c)
cf

d)
cf4

1:both B&D are properties of solid

2:conductivity as other factors like lustre needs continuous supply of photons of light

3:D due to it's covalency

b. accuracy of the data matters alot more than its number of digits, organization or amount of detail. quantitative observation is more accepted than the qualitative observation.

answer : third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol

explanation :

let us write down the given equations

equation 1 :

equation 2 :

equation 3 :

let us use hess's law to find out which 2 equations can be added to get the third equation.

let us reverse equation 2 and multiply it by 2. the new equation that we get is,

equation 4 :

let us add equation 1 & 4

the above equation is similar to equation 3 but has different value for dhrxn.

therefore third trial had the contaminated sample and the correct value for dhrxn should be 1000 kj/mol