Answer:
c.) 25 N
Explanation:
  We find the volume of the brick, knowing that the volume of a cube is given by the formula:

being l the side of the cube, which in this case is 10 cm or 0,1 m. Now we find the mass of the object, knowing the density and the Volume of the cube:

We find the weight by multiplying the mass of the object with the gravity constant. 

 
        
             
        
        
        
Answer:
Acids break down fabrics and can cause burns if the acids are strong.
Explanation:
A protective apron or lab coat is important when working with acids because acids break down fabrics and can cause burns if the acids are strong. 
- An acid is a substance that interacts with water to produce excess hydroxonium ions in an aqueous solution. 
- A strong acid ionizes completely in solution. 
- When they come in contact with a fabric, they break them down violently. 
- So, if they come in contact with the skin, it causes a violent break down of body tissues. 
- The apron acts a protective layer. 
 
        
                    
             
        
        
        
7) 6, i believe, (Cu) 1 atom+ (S) 1 atom+(0)4 atoms.
        
             
        
        
        
Answer:
m = 56.5 kg
Explanation:
Since the addition of mass on one piston caused a change in pressure head at the other. Diameter of the piston calculated is used as 0.46 m
Δm*g / Area = p * g * Δh   ..... Eq1

 
 
        
             
        
        
        
Teh humans are more revealed to the sun and that causes cancer because of all the uv rays and the ozone is the only thing thats helping us from uv rays