Answer:
#they react with oxygen to form basic oxides.
#they react with water to produce hydrogen and oxides
#they react with acids to produce H+
Answer:
69000 V
Explanation:
E = Electric field = 
d = Distance between plates = 2.3 cm
When we multiply the electric field strength and the distance between the plates of a capacitor we get the maximum voltage.
Maximum voltage is given by

The highest voltage the students can use is 69000 V
Answer:

Explanation:
Given
Density = 3 starts in 10 cubic light years.
Required
Determine the probability of 1 or more in 10 cubic light years
Since the number of stars follow a Poisson distribution, we make use of:




T = the light years

Calculating 
In probability:

Calculating P(X=0)
Substitute 0 for k and the values for
and T in








Substitute 0.04979 for P(X=0) in 


--- approximated
<em>Hence, the required probability is 0.9502</em>
Answer:
18feet
Explanation:
We need to find the distance,c between the vertex and the focus.
For a vertical parabola:

#If we place our parabola at the center, the expression changes to:

The points of the parabola are given as (12,2), substitute in our equation to find c:

Hence, the receiver should be placed at 18ft