Answer:
the answer is descriptive
Explanation:
descriotive never ever have hypothisis
1. Wood - Heterogeneous
2. Coffee - Homogeneous
3. Water - Homogeneous
4. Lucky Charms - Heterogeneous
5. Salt - Homogeneous
6. Dirt - Heterogeneous
7. Pizza - Heterogeneous
8. Air - Homogeneous
9. Milk - Heterogeneous
10. Gold - Homogeneous
Answer:
helium
Explanation:
it has 8 valence electrons which fills its outer energy level making it have a stable arrangement of electrons hence least reactive
Answer:
Surface Water - water that collects on the surface of the ground. Hope it helped!
Answer:
Explanation:
Given that:
Half life = 30 min
Where, k is rate constant
So,
The rate constant, k = 0.0231 min⁻¹
Using integrated rate law for first order kinetics as:
Where,
is the concentration at time t
is the initial concentration
Given that:
The rate constant, k = 0.0231 min⁻¹
Initial concentration = 7.50 mg
Final concentration = 0.25 mg
Time = ?
Applying in the above equation, we get that:-