Which is true about density? A possible unit for density is grams.

Liquid gold is denser than solid gold.

Density is found by multiplying mass and volume.

Density is independent of the amount of the sample.

Examine the image shown below.

What is the melting point of a substance

When its temperature changes from a gas to a liquid.

When its temperature changes from a liquid to a solid.

When its temperature changes from a liquid to a gas.

When its temperature changes from a solid to a liquid.

Which physical property is the rate at which a substance transfers heat?

boiling point

density

electrical conductivity

thermal conductivity

Lisa is using a magnet to pick up various objects. Which object is not attracted to her magnet?

cobalt

iron

nickel

wood

Can someone please help me with these

  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

wavelength divides in half and speed stays the same.

r = ρ x length / area  

ρ = r x area / length  

ρ is in ohm-meters  

in basic units, it is m³kg/s³a²  

i think this is it.