1. is when two or more materials or substances are mixed together but do not chemically combine. 2. is a mixture that has a uniform appearance and composition throughout.

3. is a mixture which you can identify the components parts just by looking at it.

4.is a substance used to dissolve other substance, or dissolving agent.

5. is a substance to be dissolved when you mix.

6.is a type of homogeneous mixture and combination of solid solute and liquid solvent

7.is a heterogeneous mixture, which has particles that do not completely dissolve and settle down at the bottom.
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8. is when two soluble liquids dissolve each other.

9.is when two liquids are insoluble each other.

10.A mixture in which very small particles of one substance are distributed evenly throughout another substance. The particles are generally larger than those in a solution, and smaller than those in a suspension​

a compound is a molecule made of atoms from different elements.

a. by the combination of an unlimited number of elements

(newtons first law)

conservation of momentum law states :

momentum before collision = momentum after collision

momentum p (kg-m/s)= mass * velocity

say moving car=1 000 kg, velocity = 10 m/s then p = 1 000*10= 10 000 kg-m/s

say still car = 2 000 kg, velocity = 0 m/s then p = 2 000* 0 = 0 kg-m/s

total momentum prior to collision = 10 000 + 0 = 10 000 kg-m/s

momentum after collision = 10 000 kg-m/s

mass now = 1 000 kg+2 000 kg = 3 000 kg

10 000 = 3 000 kg* velocity m/s

10 000/3 000 = velocity

3.33 m/s = velocity after collision

an impulse is a force applied over time , momentum is exclusive of external forces and a perfect collision is implied

considering the question as per the attachment

here we can see that the radon nuclide has 222 as the atomic mass number and 86 as the atomic number.

when it undergoes nuclear fission it gives polonium which has atomic mass number as 218 and atomic number will be 84 along with a helium nucleus which has 4 atomic mass number and 2 as its atomic number.

222 = 218 + 4 (atomic mass number)

86 = ? + 2; therefore ? = 86-2 = 84.

the atomic mass number of polonium will be 84.