the fallot ng ore.rrence,aot . cbmical ,haagel bCacson dLoxida is a colorless a

Question

the fallot ng ore.rrence,aot . cbmical ,haagel bCacson dLoxida is a colorless a 3. oNygea ha a ekting point of -218 and belliag poiat of -163 and 4 boiling point of -183° C. At ceep rature Ligatd .. o oxygen is es dry sce of satcer is a oubseance so1id is a sabstancet .Khich of tha tollouing types of aatter sugar ate euo ditteraas kinds of soleculaa. b· Tha compozicion of a "xture can vary The pzopecties at a mixturs never change. 6 khich of che tollouing is a hecerogenkous eixture a PuEe su8ar b. ait Eranbled eg8s d. vinegar 7. Nitrogen ia a a. pure subatance nixture tonic coapaund . salo 8. The chesical synbol far gold is 9· The correct spelling for the elenenc uith the chemical symbol P is a. phospborus phosphorous C Phospharus d. phospharous 0. Which one of the folloving statenents is not part of Dalton' s Aconic Theory? a. All natcer is nade up of atons. b. áll atons of a givea Eype of eleaenc are identical. c. In chenical change, the atoas reorganize iata different substances. d. tn a chenical change, acons are Indestruceibla Which of the folloving statements is true for a neutron? have a positive charge. . They are the lightest subatonic par e They ate the heaviest subatonic particle d. They are located outsi They have a positive charge. nucleus

Explanation / Answer

5) a) is not true, Mixtures can include:

6) egg is the ans because egg it's absorbed as hetrogenius, air, sugar, vinegar are homogenous

7) nitrogen is not mixture,not ion, and not salt, it's a pure substance.

8) Chemical symbol of gold is Au.

Symbol: Au

Melting point: 1,064 °C

Atomic number: 79

Atomic mass: 196.96657 u ± 0.000004 u

Electron configuration: [Xe] 4f145d106s1

Boiling point: 2,700 °C

9)Phosphorus is a chemical element with symbol P and atomic number 15.

10) option C is wrong. Becose

1) All matter is made of atoms. Atoms are indivisible and indestructible.

2) All atoms of a given element are identical in mass and properties

3) Compounds are formed by a combination of two or more different kinds of atoms.

4) A chemical reaction is arearrangement of atoms.

11). Neuton is heaviest sub atomic particles with 1. 6*10^-27Kg.

15).The chemical compound aluminum sulfate consists of two aluminum atoms, three sulfur atoms and 12 oxygen atoms.

calculation is given as. Al atoms =2 x1, S atoms = 3 x1 and O atoms = 3 x 4=12.

21). Ionic compound contains actions and anions.

22).Mercury is a chemical element with symbol Hg and atomic number 80.

23).  one atomic mass unitis exactly equal to one-twelfth the mass of carbon isotope-12.

1atomic mass unit = 1.66053886 × 10^-24 grams or 1.660 x 10^-24 g

25).and D.

A substance consisting of atoms or ions of two or more different elements in definite proportions joined by chemical bonds into a molecule.

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