All categories

3 years ago

Which element is a metal? A. Li B. P C. Ar

Chemistry

1 answer:

kogti [31]3 years ago

8 0

Answer:

Explanation:

On the List of metals On the Periodic Table LI is listed on there however P is nonmetal And AR is Non Metal

You might be interested in

Which type of matter tends to become LESS soluble in water as the temperature rises? *

Kisachek [45]

B.liquids thanks have a great day

8 0

4 years ago

Calculate ΔS° for the reaction: 4Cr(s) + 3O2(g) → 2Cr2O3(s), Substance: Cr(s) O2(g) Cr2O3(s), S°(J/K⋅mol): 23.77 205.138 81.2

Mariana [72]

Answer: The value of $\Delta S^o$ for the reaction is 1051.93 J/K

Explanation:

Entropy change is defined as the difference in entropy of all the product and the reactants each multiplied with their respective number of moles.

The equation used to calculate entropy change is of a reaction is:

$\Delta S^o_{rxn}=\sum [n\times \Delta S^o_{(product)}]-\sum [n\times \Delta S^o_{(reactant)}]$

For the given chemical reaction:

$4Cr(s)+3O_2(g)\rightarrow 2Cr_2O_3(s)$

The equation for the entropy change of the above reaction is:

$\Delta S^o_{rxn}=[(2\times \Delta S^o_{(Cr_2O_3(s))})]-[(4\times \Delta S^o_{(Cr(s))})+(3\times \Delta S^o_{(O_2(g))})]$

We are given:

$\Delta S^o_{(Cr_2O_3(s))}=881.2J/K.mol\\\Delta S^o_{(O_2(g))}=205.13J/K.mol\\\Delta S^o_{(Cr(s))}=23.77J/K.mol$

Putting values in above equation, we get:

$\Delta S^o_{rxn}=[(2\times (881.2))]-[(4\times (23.77))+(3\times (205.13))]\\\\\Delta S^o_{rxn}=1051.93J/K$

Hence, the value of $\Delta S^o$ for the reaction is 1051.93 J/K

5 0

4 years ago

When the hydrogen isotope tritium-3 emits a beta particle, it becomes an isotope of_______.

saw5 [17]

The answer is helium

8 0

3 years ago

Read 2 more answers

From this list, choose all of the ionic compounds. Check all that apply. View Available Hint(s) Check all that apply. POCl3 KOCH

Alik [6]

Answer: $KOCH_2CH_3$ , $CH_3CH_2COONa$ , NaOH are all ionic compounds.

Explanation:

It is known that ionic compounds are the compounds in which one atom transfer its valence electrons to another atom. Hence, during this transfer partial opposite charges tend to develop on the combing atoms due to which strong force of attraction exists between the atoms.

An ionic bond is always formed between a metal and a non-metal.

For example, $KOCH_2CH_3$ , $CH_3CH_2COONa$ , NaOH are all ionic compounds.

On the other hand, a compound formed due to sharing of electrons between the combining atoms is known as a covalent compound. Generally, a non-metal with same or different non-metal tends to form a covalent bond.

For example, $POCl_{3}$ , $SOCl_{2}$ etc are all covalent compounds.

Thus, we can conclude that $KOCH_2CH_3$ , [tex]CH_3CH_2COONa, NaOH are all ionic compounds.

4 0

3 years ago

Calculate the percentage by mass of oxygen in (nh4)2co3

lianna [129]

96.09 g/mol, so weight of Oxygen in the whole thing is 16g/mol*3 = 48.

48/96.09 = around 49.95%

5 0

4 years ago