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6. Which combination of atoms is most likely to produce a compound with ionic bonds?
Al and F
2
11. Which element has the greatest number of electrons?
₂₀c - 1s²2s²2p⁶3s²3p⁶4s²
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44. How do you calculate the percentage composition by mass of an element in a compound?
By dividing the mass of the element in one mole of the compound by the mass of one mole of the compound and multiplying the quotient by 100%.
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2. Which of the following statements is INCORRECT?
The covalent bond is formed by the transfer of electrons.
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17. Given the following electronegativity values.
Y and z
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46. Potassium permanganate is extensively used for medical purposes including as an antiseptic and fungicide. What is the percentage composition of potassium in a compound KMn₄ (Mn=54.9 amu; O=39.1 amu)
24.75%
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10. Which combination describes the ilame color of the compound when heated?
Sodium Chloride – Yellow orange
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26. Which statement best explains why the element carbon forms so many compounds?
Carbon atoms combine readily with oxygen.
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25. The open chain apilhatic hydrocarbon with molecular formula of C₉H₁₆ is ________
An alkyne
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47. What will be the molecular weight of a chemical consisting of 2 moles of H₂ SO₄ 3 moles of SO₂ and 1 mole of NaOH?
428 g/mole
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38. Which among the following is the heaviest?
100 amu of Uranium
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8. Which of the following pairs of elements and valence electrons is INCORRECT?
Sn- 4
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12. For a neutral atom with the electron configuration of 1s2s2p3s. Which statement is INCORRECT?
The atom is in a ground state
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24. Which of the following is the correct pairing of carbon compunds to its uses? 1. Sting insect bites. A. Formic acid 2. Fragrance. B. Ester 3. Best for solvent extraction. C. Ether
1-a; 2-b; 3-c
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9. What kind of bonding occurs in the water molecule?
ionic bond
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35. Miss Reyes advised her students to preserve a fish for their project. What compound should she use to preserve the fish?
Formaldehyde
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39. Which of the following is TRUE of different substances having an equal number of moles?
They have equal number of particles.
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21. Which of the following metals is usually used as construction material?
Iron
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15. Particles with charges make up atoms,In an atom, which has negatively charge particle?
Electron
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16. Carbon shows covalency of _________.
4
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19. What will most likely happened to a non metallic atom after ionic bonding? It forms a cation I. It forms an anion II. It becomes stable III. It becomes unstable
II and III
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20. Which of the following is an essential constituent of hemoglobin and stored in body tissues to supple body needs?
Iron
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32. Which type of compound is rosponaible in many of the pleasant smella of fruits and flower?
Esters
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29. Why do carbon atoms form four (4) bonds?
Because it has four valence electrons
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43. What quantity determines the percentage composition of a compound in a chemical formula?
Mole
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45. Water is an organic chemical substance that is vital for all known forms of life. Find the percentage composition of Hydrogen in water.
11.21%
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3. What element is most likely to donate an electron to be a cation?
Na
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48. The term used to describe the percent by mass of each element in a compound is called percentage composition. Calculate the percentage by mass of oxygen in a compound Ca(NO₃)
58.54%
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40. Calculate the number of molecules in 6.2 g of formaldehyde, CH₂0 (C-12.0 amu; H-1.0 amu: 0-16.0 amu)
3.7x10²⁴
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27. Which compound is correctly named? I. CO - Carbon Monoxide II. CH₃ - Methane III. H₃P - Tri hydrogen phospide
I and II
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23. Which are true about organic compound? I. Organic compounds contain calcium II. Organic compounds contain carbon III. Organic compounds can be produced by living things IV. Organic compounds can be produced artificially
II and III only
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1. Why do atoms form bond?
Atoms form bond because they need to attain the valence electron of a noble gas
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42. Methane is a principal component of natural gas. How many moles of CH₄ are present in 6.07 g of CH₄?
0.378 mole
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22. Andrew cut his finger accidentally when he was slicing the apple. He has to apply something onhis wounds so that it can not get infected. Which compound is the most appropriate to use?
Hydrogen peroxide
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31. The gas used in the welding and cutting metal is_______
Ethyne/Acetylene
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5. Which of the following is NOT a property of ionic compounds?
Has low boiling point
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34. Aldehydes and ketones are classes if organic compounds used in preserving dead bodies, add fragrance in making perfumes and as a nail polish remover. Which of the following organic compounds are correctly paired with their common and systematic names?
Formalin: methanal
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41. If one dozen is 12 pieces of eggs, how many atoms of oxygen are there in one mole of oxygen?
6.02x10²³ atoms
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33. Which are TRUE about the use of 70% of ethyl alcohol? I. Solvent II. Fertilizer III. Disinfectant IV. Lubricant
I and III only
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36. Graphite differs from diamond because graphite is ____________
Slippery to touch and good conductor of heat.
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14. The easier an atom loses its electron, the lesser its. ______________
lonization energy
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37. Which of the following is true about mole?
It is equivalent to 6.022x1028 particles.
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4. Which of the following would be characterized as a molecular compound? I. CO II. Zn(OH) 2 III. Fe
I only
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49. How many moles of oxygen will be released if 5.Og of hydrogen peroxide (H₂ O₂) completely react with the catalase in the blood?
0.13 mole O₂
45
7. Which of the following bonds has the greatest electrical and thermal conductivity?
Metallic bond
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28. How many hydrogen atoms can still form bond with carbon if oxygen is already bonded with carbon?
2
47
13. Which element has the proper arrangement of electron configuration?
1s²2s²2p³
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18. How does ionic bond take place?
A metallic element like sodium is attracted to a nonmetallic element like fluorine.