A sample has a volume of 10 ml and a mass of 4.2 g what density of the object

0.42g/cm³ or 420kg/m³

Explanation:

1cm³ = 1ml

10 × 1cm³ = 10cm³

Density = Mass ÷ Volume

4.2g ÷ 10cm = 0.42 g/cm³

Density = 0.42g/cm³ or 420kg/m³

you need to take a look at the periodic system in order to sort these elements into pairs that would most likely exhibit similar chemical properties. first, you need to find elements that are found in the same group (groups are vertical in the periodic system), and then to see whether they have the same valence number. if they meet these criteria, they will have similar properties.

the first pair: ne (neon) and kr (krypton), are noble gases found in group 8

the second pair: li (lithium) and k (potassium), found in group 1

the third pair: s (sulfur) and te (tellurium), found in group 6

for step 7 table c on the lab "newtons law of action"   the average time it took the car to travel .25 meters   was 1.92 seconds.

the average time it took the car to travel 0.50 meters was 2.61 seconds

hope this : )