Science test 2nd

48問 • 2年前

lil zabrina Torres

通報

問題一覧

1. Why do atoms form bond?

Atoms form bond because they need to attain the valence electron of a noble gas

2. Which of the following statements is INCORRECT?

The covalent bond is formed by the transfer of electrons.

3. What element is most likely to donate an electron to be a cation?

4. Which of the following would be characterized as a molecular compound? I. CO II. Zn(OH) 2 III. Fe

I only

5. Which of the following is NOT a property of ionic compounds?

Has low boiling point

6. Which combination of atoms is most likely to produce a compound with ionic bonds?

Al and F

7. Which of the following bonds has the greatest electrical and thermal conductivity?

Metallic bond

8. Which of the following pairs of elements and valence electrons is INCORRECT?

Sn- 4

9. What kind of bonding occurs in the water molecule?

ionic bond

10. Which combination describes the ilame color of the compound when heated?

Sodium Chloride – Yellow orange

11. Which element has the greatest number of electrons?

₂₀c - 1s²2s²2p⁶3s²3p⁶4s²

12. For a neutral atom with the electron configuration of 1s2s2p3s. Which statement is INCORRECT?

The atom is in a ground state

13. Which element has the proper arrangement of electron configuration?

1s²2s²2p³

14. The easier an atom loses its electron, the lesser its. ______________

lonization energy

15. Particles with charges make up atoms,In an atom, which has negatively charge particle?

Electron

16. Carbon shows covalency of _________.

17. Given the following electronegativity values.

Y and z

18. How does ionic bond take place?

A metallic element like sodium is attracted to a nonmetallic element like fluorine.

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

20. Which of the following is an essential constituent of hemoglobin and stored in body tissues to supple body needs?

Iron

21. Which of the following metals is usually used as construction material?

Iron

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

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

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

25. The open chain apilhatic hydrocarbon with molecular formula of C₉H₁₆ is ________

An alkyne

26. Which statement best explains why the element carbon forms so many compounds?

Carbon atoms combine readily with oxygen.

27. Which compound is correctly named? I. CO - Carbon Monoxide II. CH₃ - Methane III. H₃P - Tri hydrogen phospide

I and II

28. How many hydrogen atoms can still form bond with carbon if oxygen is already bonded with carbon?

29. Why do carbon atoms form four (4) bonds?

Because it has four valence electrons

31. The gas used in the welding and cutting metal is_______

Ethyne/Acetylene

32. Which type of compound is rosponaible in many of the pleasant smella of fruits and flower?

Esters

33. Which are TRUE about the use of 70% of ethyl alcohol? I. Solvent II. Fertilizer III. Disinfectant IV. Lubricant

I and III only

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

35. Miss Reyes advised her students to preserve a fish for their project. What compound should she use to preserve the fish?

Formaldehyde

36. Graphite differs from diamond because graphite is ____________

Slippery to touch and good conductor of heat.

37. Which of the following is true about mole?

It is equivalent to 6.022x1028 particles.

38. Which among the following is the heaviest?

100 amu of Uranium

39. Which of the following is TRUE of different substances having an equal number of moles?

They have equal number of particles.

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

41. If one dozen is 12 pieces of eggs, how many atoms of oxygen are there in one mole of oxygen?

6.02x10²³ atoms

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

43. What quantity determines the percentage composition of a compound in a chemical formula?

Mole

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%.

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%

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%

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

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%

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

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問題一覧

1. Why do atoms form bond?

Atoms form bond because they need to attain the valence electron of a noble gas

2. Which of the following statements is INCORRECT?

The covalent bond is formed by the transfer of electrons.

3. What element is most likely to donate an electron to be a cation?

4. Which of the following would be characterized as a molecular compound? I. CO II. Zn(OH) 2 III. Fe

I only

5. Which of the following is NOT a property of ionic compounds?

Has low boiling point

6. Which combination of atoms is most likely to produce a compound with ionic bonds?

Al and F

7. Which of the following bonds has the greatest electrical and thermal conductivity?

Metallic bond

8. Which of the following pairs of elements and valence electrons is INCORRECT?

Sn- 4

9. What kind of bonding occurs in the water molecule?

ionic bond

10. Which combination describes the ilame color of the compound when heated?

Sodium Chloride – Yellow orange

11. Which element has the greatest number of electrons?

₂₀c - 1s²2s²2p⁶3s²3p⁶4s²

12. For a neutral atom with the electron configuration of 1s2s2p3s. Which statement is INCORRECT?

The atom is in a ground state

13. Which element has the proper arrangement of electron configuration?

1s²2s²2p³

14. The easier an atom loses its electron, the lesser its. ______________

lonization energy

15. Particles with charges make up atoms,In an atom, which has negatively charge particle?

Electron

16. Carbon shows covalency of _________.

17. Given the following electronegativity values.

Y and z

18. How does ionic bond take place?

A metallic element like sodium is attracted to a nonmetallic element like fluorine.

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

20. Which of the following is an essential constituent of hemoglobin and stored in body tissues to supple body needs?

Iron

21. Which of the following metals is usually used as construction material?

Iron

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

II and III only

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

25. The open chain apilhatic hydrocarbon with molecular formula of C₉H₁₆ is ________

An alkyne

26. Which statement best explains why the element carbon forms so many compounds?

Carbon atoms combine readily with oxygen.

27. Which compound is correctly named? I. CO - Carbon Monoxide II. CH₃ - Methane III. H₃P - Tri hydrogen phospide

I and II

28. How many hydrogen atoms can still form bond with carbon if oxygen is already bonded with carbon?

29. Why do carbon atoms form four (4) bonds?

Because it has four valence electrons

31. The gas used in the welding and cutting metal is_______

Ethyne/Acetylene

32. Which type of compound is rosponaible in many of the pleasant smella of fruits and flower?

Esters

33. Which are TRUE about the use of 70% of ethyl alcohol? I. Solvent II. Fertilizer III. Disinfectant IV. Lubricant

I and III only

Formalin: methanal

35. Miss Reyes advised her students to preserve a fish for their project. What compound should she use to preserve the fish?

Formaldehyde

36. Graphite differs from diamond because graphite is ____________

Slippery to touch and good conductor of heat.

37. Which of the following is true about mole?

It is equivalent to 6.022x1028 particles.

38. Which among the following is the heaviest?

100 amu of Uranium

39. Which of the following is TRUE of different substances having an equal number of moles?

They have equal number of particles.

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

41. If one dozen is 12 pieces of eggs, how many atoms of oxygen are there in one mole of oxygen?

6.02x10²³ atoms

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

43. What quantity determines the percentage composition of a compound in a chemical formula?

Mole

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%.

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%

24.75%

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

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%

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