Chemistry questions

A visually stimulating chemistry-themed image featuring colorful chemical structures, laboratory equipment, and illustrations of molecular interactions, creating an engaging learning atmosphere.

Test Your Chemistry Knowledge

Challenge yourself with our comprehensive chemistry quiz featuring 45 questions that span various topics, from acid-base balance to the properties of water. Whether you're a student or just a chemistry enthusiast, this quiz offers a great way to assess your understanding and retention of essential concepts.

Multiple choice and checkbox formats
Covering key areas in chemistry
Ideal for learners and educators alike

45 Questions11 MinutesCreated by DivingAtom243

What is concentration?

The amount of solute dissolved in the total volume of the solution

The amount of solute dissolved in the total mass of the solution

The amount of solute dissolved in the total mass of solvent

Concentrations of solutions

Two main groups of concentration units

1. The amount of substance dissolved in the appropriate amount of solution

2. The number of moles of substance dissolved in appropriate volume of solution

Weak interactions between atoms are characterized by:

1. The covalent bonds are determined by amount of energy needed to separate two atoms to produce neutral atoms again

2. Hydrogen bond

3. Hydrophobic effect

4. Electrostatic/Ionic bond

Coordination number value in coordinated compounds depends on

1. Spatial orientation

2. Ability of central ion to accept electron pairs to “d” subshells

3. Amount of substituents per central ion

4. Amount of adjacent electron pairs

In complex compounds we can distinguish:

1. Structural isomers which have the same chemical composition

2. Structural isomers which have different composition of complex ions

3. Central ion in stereoisomers which is not surrounded with the same ligands

4. Positioning of ligands in different directions in stereoisomers

From Henderson Hasselbach equation it follows that:

1. The calculation of the pH value of the buffer mixture is possible when the concentration of the buffer components is given

2. The pH of the buffer mixture depends only on the nature of the acid comprised in it (pKa)

3. The pH of the buffer mixture decreases with dilution of the buffer and increases with concentration of the buffer

4. When the concentration of the buffer components are the same then pH = pKa

Bicarbonate buffer:

1. Is a mixture of NaHCO3 and H2CO3

2. Proton donner is NaHCO3

3. Proton acceptor is Na2CO2

4. pH of bicarbonate buffer in blood is 7.7

Disturbance of acid - base balance results form

1. Too much acid in the body

2. Deletion of alkaline reserves in the body

3. Excess base in the body

4. Insufficient acid in the body

When Enthalpy is ∆G = 0

1. System is equilibrium, no changes in the system

2. Reaction is exothermic

3. System is equilibrium, no changes in the system

4. Reaction is endothermic

Exothermic reaction:

1. Flow of energy is form inside to outside

2. It is spontaneous type of reaction

3. After reaction ends system has less energy than before start

Characteristic Properties of activated complex:

1. It reaches energy state necessary for reaction to takes place

2. Life time is very short

3. Life time is very long

4. It can degenerate to substrates or products of the reaction

5. It can degrade only to products of the reaction

All components in cells (protein DNA, poly sacharoides) are dissolved in water whixh is related to important water properties:

The truth about water molecule is that

1. Water dissolves most of the compounds with ionic bonding including metal salts

2. Water dissolves most of the compound’s nonpolar substances such as oil

3. Water participates in protein folding

4. Human cells depend on covalent interactions involving water bonds

Water molecule is characterized by

1. Pentagonal bipyramidal geometry

2. Dipol character

3. Angle between oxygen and hydrogen atoms = 104,5°

4. Tetrahedral local order in liquid water revealed by a theoretical calculation of three-dimensional map of regions around the central water molecule

Water represents on average

1. 60% of the body weight in adult men, and 50-55% in women

2. 70% of the body weight in adult men, and 65% in women

3. 45% of the body weight in adult men, and 50-55% in women

4. 60% of the body weight in adult men, and 40-55% in women

The major cation and anion in intracellular fluid are:

1. Potassium, phosphate

2. Sodium, chloride

3. Sodium, phosphate

4. Potassium, chloride

Coagulation:

1. It is an ability of colloid particles to combine with each other and form larger structures called (Colloid?)

2. Can be caused by radioactive – beta ray

3. Of hydrophobic colloids takes place when electrical charge on the particle surface is neutralized

In comparison to other liquids water has

1. High boiling and melting points

2. High specific heat

3. High surface tension

Which sentences are true

1. Deficiency of one element can not be substituted by different element

2. High specificity is related to specific proteins which recognize specific elements

3. In vitro specificity of trace elements is much smaller than in vivo

4. Elements function depends on concentration of other elements

Radical damage

1. To lipids in lipoproteins can be a reason of atherosclerosis

2. To nucleic acids can be a reason of mutations and cancer

3. To proteins can be a reason of auto-immune diseases

Polar covalent bond

1. Is formed between elements with the same different electronegativity

2. Is present in NaCl molecule

3. Carries partial positive and negative charges on opposite ends

Coordinate covalent bond

1. Is present in NH4+ molecule

2. Is formed by electrons of only one element

3. Is formed between water molecules

Hemoglobin buffer

1. Acts outside the cell

2. Acts inside the cell

3. Acts with connection with bones

4. Is a proteinate buffer

Calcium ions

1. Are component of hydroxyapatite

2. Can act as regulator of metabolic processes

3. Are not integral component of thyroid hormones

4. Can be part of enzymatic activity

Magnesium

1. In the body mainly exists in the cells

2. Is an activator of many enzymes

3. Stabilizes structure of ribosomes

Two solutions are separated by a semipermeable membrane (only water can penetrate across the membrane). One is 1.0M NaCl, second 2.0M glucose. Osmotic pressure

A. Is the same in both compartments

B. is 2 times higher in compartment with NaCl

C. is 2 times higher in compartment with glucose

D. There is no osmotic pressure

In intracellular fluids dominate:

1. cations: potassium and sodium

2. anions: phosphates and chlorides

3. anions: chlorides and hydrocarbonates

4. cations: potassium and magnesium

PH of the buffer capacity depends on

1. Concentration of its components

2. Ratio of its components

3. Dilution of buffer

4. Increases with their incremnt

5. Decreases with dilution of buffer

In normal conditions, parameters of bicarbonate buffer in blood are

1. pH: 6.2

2. pCO2 : 40 mm Hg (5.3kPa)

3. HCO3- : 24 mmol/L

4. pH 7,4

Change of pH from 2.0 to 1.0 is a result of a

A. Decrease of H+ from 100mM to 10mM

B. Increase of H+ from 10mM to 100mM

C. Increase of H+ from 100mM to 1000mM

D. Decrease of H+ from 1000mM to 100mM

Bicarbonate buffer is most significant in the body because

1. pH of blood is equal to pK of carbonic acid

2. It can act in open system

3. Concentration of it components can be regulated by kidney and lungs

Unlock and Upgrade

Remove all limits from your Quizzes

Chemistry questions

Test Your Chemistry Knowledge

More Quizzes