A lost all the mass of an atom is concentrated in the nucleus. True False In an

Question

A lost all the mass of an atom is concentrated in the nucleus. True False In an endothermic process, heat is absorbed by the system. True False The atomic number is equal to the number of protons in the nucleus of each atom of an element. True False Ethanol (C_2H_5 - OH) will have a greater viscosity than ethylene glycol (HO - CH_2CH_2 - OH) at the temperature. True False For water K_f = 1.86degreeC/m. Therefore, the freezing points of 1.0 M aqueous KCI and C_2H_5OH (Ethan solutions are the same. True False 16 mega grams (Mg) is equal to 1.6 times 10^7 g. True False The SI base unit of length is the centimetre. True False The solubility of a solid always increases with increasing solvent temperature. True False A home aquarium is an example of an open system. True False 20 degree C is colder than 40degreeF. True False Of the substances KCI, KBr, and KF, KF will have the highest melting point. True False An object sinks when placed in water if the mass of the object is greater than the mass of the water object displaces. Which of these objects will not sink when dropped into a bucket of water'? (Given: density of water = 1.00 g/cm^3) a cube of Aluminum (density = 2.702 g/cm^3) a diamond (density = 3.51 g/cm^3) a chunk of dry ice (density = 1.56 g/cm^5) a chunk of sodium (density = 0.91 g/cm^3) a sphere of magnesium (density = 1.74 g/cm^3)

Explanation / Answer

1. atomic mass = mass of protons + mass of neutrons

     total mass is concentrated central of atom

TRUE

2. A chemical reaction heat is absorb is called endothermic reaction

   TRUE

3. atomic number of atom is equal to number of protons

TRUE

4. FLASE

5. FLASE

KCl ------> K+ + Cl- two ions are present but ethyl alcohol is non electrolyte.

6. FLASE

16/24            = 0.67 moles

7. SI unit is m

FLASE

8. TRUE

9. FLASE

10. FLASE

11. TRUE Kf is more ionic and more lattice energy.

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