Three statements about electric charge are given. 1 An ammeter directly measures how much electric charge is in an object.
2 A moving electric charge can be detected by an ammeter.
3 A flow of electric charge is an electric current.
Which statements are correct?
A 1 and 2 only B 1 and 3 only C 2 and 3 only D 1, 2 and 3

i agree kid

explanation:

a

  the grams     of oxygen gas   that can be produced     is 20.6   grams of o₂

calculation

2liclo₃ →   2 licl + 3 o₂

step 1:   find the moles of liclo₃

moles = mass÷ molar mass

from periodic table the molar mass of liclo₃ =6.9 +35.5   +(16 x3) =90.4 g/mol

moles=38.7 g÷90.4 g/mol=0.4281   moles

step 2:   use the   mole ratio   to calculate the moles of o2

from equation above, liclo₃: o₂   is 2: 3  

therefore the moles of   o₂=0.4281 moles x3/2 =0.6422   moles

step 3: find mass   of o₂

mass= moles x molar mass

from periodic table the   molar mass of   o₂ = 16 x2= 32 g/mol

mass=0.6422   moles   x   32 g/mol = 20.6 grams of o₂

what is the speed of a softball that travels 20m in 2secs

speed = 20/2 = 10 m/s

3. dark matter

empty space could also be a simple vacuum