Lead can be extremely poisonous and was once used in many many paints but caused several deaths from lead poisoning so that was a biggie...
At the center of every chlorophyll molecule, in every plant, there is a magnesium ion. Magnesium is one of the two dozen or so elements that are <em>required </em>for life.
It is primarily, from this list, nitrogen and carbon that trap infrared energy, although the extent to which this happens is determined by many other factors, such as heat. :D
<u>Answer: </u>The chemical formula for Palladium(IV) sulfate is
<u>Explanation:</u>
Palladium is the 46th element of the periodic table which has an oxidation state of +4 (because it is a metal and will form positive ion) and sulfate is the polyatomic ion having a charge of -2 with formula
So, to write the formula of the compound, we do criss cross method in which oxidation state of each element or ion is given to the other combining atom which results into the formation of a neutral compound.
The chemical formula of the compound is
The image is given below.
Answer:
11.3 g/cm³
Explanation:
Data Given:
Diameter of lead ball = 10.0 mm
Convert mm to cubic centimeter (cm³)
1 mm = 0.1 cm
So,
10.0 mm = 10.0 x 0.1 = 1 cm
mass of lead ball = 5.910 g
density of of lead ball =?
Solution:
To find density formula will be used
d = m/V ...........(1)
where
d = density
m = mass
V = volume
So,
To find the density of the lead ball (sphere), first we have to find volume of the ball.
To find volume of the ball following formula will be used
V = 4 . π . r³/ 3 ..............(2)
where
π = 3.14
r = radius
So,
as
So, radius will be
r = 1 cm / 2
r = 0.5 cm
Now put values in formula 2
V = (4)(3.14)(0.5cm)³/ 3
V = (12.56)(0.125 cm³) /3
V = 1.57 cm³/3
V = 0.523 cm³
So, the volume of the lead ball is 0.523 cm³
Now put values in equation 1
d = m/V
d = 5.910 g / 0.523 cm³
d = 11.3 g/cm³
Density of the lead ball = 11.3 g/cm³
Answer:
The reaction is an exothermic reaction .
The value of q is -880 kilo Joules.
Explanation:
Exothermic reactions are defined as the reactions in which energy of reactants is more than the energy of the products. In these reactions, energy is released by the system. The total enthalpy of the reaction comes out to be negative.
According to reaction, 2 moles of ammonia when reacts with 3 moles of nitrous oxide to give 4 moles of nitrogen gas and 3 moles of water vapor, along with release of 880 kJ of heat energy.
Since, heat is evolved during the course of reaction which means that reaction is an example of Exothermic reaction.
The reaction is an exothermic reaction .
The value of q is -880 kilo Joules.