Answer:
hi there !!
B) Water evaporates into steam.
this is correct because only physical state changes, steam can be cooled down to get water again.
Answer:
The specific heat capacity of the metal is 0.268 J/g°C
Explanation:
Step 1: Data given
Mass of the metal = 151.5 grams
The temperature of the metal = 75.0 °C
Temperature of water = 15.1 °C
The temperature of the water rises to 18.7°C.
The specific heat capacity of water is 4.18 J/°C*g
Step 2: Calculate the specific heat capacity of the metal
heat lost = heat gained
Q = m*c*ΔT
Qmetal = - Qwater
m(metal) * c(metal) * ΔT(metal) = m(water) * c(water) * ΔT(water)
⇒ mass of the metal = 151.5 grams
⇒ c(metal) = TO BE DETERMINED
⇒ΔT( metal) = T2 - T1 = 18.7 °C - 75.0 °C = -56.3 °C
⇒ mass of the water = 151.5 grams
⇒ c(water) = 4.184 J/g°C
⇒ ΔT(water) = 18.7° - 15.1 = 3.6 °C
151.5g * c(metal) * -56.3°C = 151.5g * 4.184 J/g°C * 3.6 °C
c(metal) = 0.268 J/g°C
The specific heat capacity of the metal is 0.268 J/g°C
he arsenic acid or arsenate hydrogen as it is also known to this compound (H 3 AsO 4 ) is the acid form of <span>ion </span>arsenate , AsO<span>4 </span>3- , one anion trivalent in which arsenic has an oxidation state of + 5. Chemically, arsenates behave in a similar way tophosphates .
There is another compound derived from this one that is the arsenious acid or arsenite of hydrogen
The molecular formula for compound is 
mass of compound is 0.670 g.
To calculate number of atoms first calculate number of moles in the compound as follows:
Molar mass of is 283.886 g/mol, thus,
Thus, number of mole of is 0.00236 mol.
From the molecular formula 1 mole of has 2 mol of P (phosphorus) and 5 mol of O (oxygen).
Thus, number of moles of P and O in 0.00236 mol of will be:
Similarly,
Now, in 1 mol of an element there are 
atoms.
Number of atoms of P will be:
Similarly, number of atoms of O will be:
Total number of atoms will be sum of number of atoms of P and O:
Therefore, total number of atoms in will be 
.
Answer:
[Ne]3s2
Explanation:
ahora tenemos que mirar cada una de las configuraciones electrónicas de cada átomo de cerca antes de tomar una decisión.
considerando la configuración electrónica más externa de cada una de las especies mostradas;
para la primera configuración, ns2 np6 corresponde a un gas noble.
para la segunda configuración ns2 np3 corresponde a un elemento no metálico del grupo 5.
para la tercera configuración, ns2 corresponde a un elemento metálico del grupo 2.
para la cuarta configuración, ns2 np4 corresponde a un elemento no metálico del grupo 6
