Answer and explanation;
Na - metal
Cl - poisonous gas
NaCl - cyrstaline solid that is edible
An emergent property is a property which a collection or complex system has, but which the individual members do not.
Water emergent properties: cohesion & adhesion, versatile solvent, temperature moderation, freezing.
The properties of a compound can be very different from the properties of the elements that make them, for example, Sodium is an explosive metal, and Chlorine is a toxic gas, however, sodium chloride is a Delicious table salt!
Answer:
The answer to your question is below
Explanation:
Energy is absorbed in an exothermic reaction. An exothermic reaction releases energy so this option is wrong.
Energy is released in an endothermic reaction. This option is wrong because an endothermic reaction absorbed energy.
The products have more potential energy than the reactants in an exothermic reaction. This option is wrong because in this kind of reactions the reactants have more potential energy than the products.
The products have more potential energy than the reactants in an endothermic reaction. This option is correct, one characteristic of endothermic reactions is that the products have more potential energy than the reactants.
Answer : The amount left of leutium-176 will be, 2.10 g
Solution :
First we have to calculate the rate constant, we use the formula :
Now we have to calculate the amount left of the sample.
Expression for rate law for first order kinetics is given by :
where,
k = rate constant =
t = decay time =
a = initial amount of the sample = 16.8 g
a - x = amount left after decay process = ?
Now put all the given values in above equation, we get
Therefore, the amount left of leutium-176 will be, 2.10 g
Answer A)
1. Ne will have 10 protons and the charge of protons is positive.
2. Ne will have 10 neutrons and there is no charge on the neutrons.
3. Ne has 10 electrons and the electrons have a negative charge.
4. Atomic number of Ne is 10.
5. Atomic mass of Ne is 20.1797 u.
6. Name of the atom is Neon.
Answer B)
1. Hydrogen has no neutrons.
2. Atomic mass of carbon is 12 u.
3. Calcium has 20 protons.
4. Fluorine has 10 neutrons.
5. Potassium has 20 neutrons.
6. Oxygen has 8 protons.
Protons identifies an atom.
The number of grams of copper reacted is 445 grams
<u><em>calculation</em></u>
2Cu +O₂ → 2CuO
from equation above the mole ratio of Cu:CUO is 2:2 =1:1, therefore the moles of Cu is also= 7.00 moles
mass=moles x molar mass
from periodic table the molar mass of Cu= 63.5 g/mol
mass= 7.00 moles x 63.5 g/mol =445 grams