Фильтр публикаций


What is the function of the cell membrane?
Опрос
  •   a) Protection and support
  •   b) Control of substances entering and leaving the cell
  •   c) Protein synthesis
  •   d) Storage of genetic material
18 голосов


Which molecule is split during the light-dependent reactions to release oxygen?
Опрос
  •   a) Water
  •   b) Carbon dioxide
  •   c) Glucose
  •   d) ATP
16 голосов


Enzymes are composed primarily of which type of biomolecule?
Опрос
  •   A. Lipids
  •   B. Carbohydrates
  •   C. Nucleic acids
  •   D. Proteins
52 голосов


Which region of human digestive tract contains enzymes that perform well at High pH?
Опрос
  •   A) Mouth
  •   B) stomach
  •   C) small intesine
  •   D) Large intestine
1 голосов


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Which of these elements exhibits the most metallic character?
Опрос
  •   a)  Carbon (C)
  •   b)  Silicon (Si)
  •   c)  Germanium (Ge)
  •   d)  Tin (Sn)
25 голосов


As you move down a group in the periodic table, atomic radius generally:
Опрос
  •   a)  Increases
  •   b)  Decreases
  •   c)  Remains constant
  •   d)  Shows no consistent trend
20 голосов


Which of the following elements has the lowest first ionization energy?
Опрос
  •   a)  Helium (He)
  •   b)  Sodium (Na)
  •   c)  Neon (Ne)
  •   d)  Argon (Ar)
20 голосов


4.  Which of these elements would be expected to have the largest ionic radius?
Опрос
  •   a)  Li⁺
  •   b)  Na⁺
  •   c)  K⁺
  •   d)  Rb⁺
23 голосов


Which element has the highest electronegativity?
Опрос
  •   a)  Fluorine (F)
  •   b)  Chlorine (Cl)
  •   c)  Francium (Fr)
  •   d)  Oxygen (O)
30 голосов


What is the law of conservation of mass?
Опрос
  •   a) Mass can be created or destroyed in a chemical reaction.
  •   b) Mass remains constant in a chemical reaction.
  •   c) Mass is only present in solids.
  •   d) Mass can change forms but not
24 голосов


8. What is the process called when a solid changes directly into a gas?
Опрос
  •   a) Melting
  •   b) Freezing
  •   c) Sublimation
  •   d) Condensation
23 голосов


Which of the following is an example of a mixture?
Опрос
  •   a) Water (H₂O)
  •   b) Sodium chloride (NaCl)
  •   c) Air
  •   d) Carbon dioxide (CO₂)
24 голосов


6. What type of bond is formed when electrons are shared between atoms?
Опрос
  •   a) Ionic bond
  •   b) Metallic bond
  •   c) Covalent bond
  •   d) Hydrogen bond
28 голосов


4. Which gas is produced when an acid reacts with a metal?
Опрос
  •   a) Oxygen
  •   b) Hydrogen
  •   c) Carbon dioxide
  •   d) Nitrogen
27 голосов


1. What is the atomic number of an element?
Опрос
  •   a) The number of protons in an atom
  •   b) The total number of electrons in an atom
  •   c) The number of neutrons in an atom
  •   d) The total mass of an atom
57 голосов


1.  Which of the following properties generally INCREASES from left to right across a period in the periodic table?
Опрос
  •   A) Atomic radius
  •   B) Ionization energy
  •   C) Metallic character
  •   D) Number of electron shells
59 голосов


Choose the correctly punctuated sentence:
Опрос
  •   A. However I don’t agree with your idea.
  •   B. However, I don’t agree with your idea.
  •   C. However I, don’t agree with your idea.
  •   D. However I don’t, agree with your idea.
75 голосов


What happens to the rate of reaction when the temperature is increased?
Опрос
  •   A. The rate decreases.
  •   B. The rate increases.
  •   C. The rate remains unchanged.
  •   D. The reaction stops.
80 голосов


If a solution has a pH of 3, it is considered:
Опрос
  •   A) Neutral
  •   B) Slightly acidic
  •   C) Highly acidic
  •   D) Basic
21 голосов

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