Chemistry Quiz Marathon

Froggy Jumps

Parties jouées 11 %Précision 73 Temps moyen 34:26

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Chemistry impact and basics

Créé par

Israel Gurrobat

Philippines

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Chemistry Quiz Marathon


Froggy Jumps Chemistry Quiz MarathonVersion en ligne Chemistry impact and basics par Israel Gurrobat 1 How does chemistry contribute to health, environment, and industry, and what career opportunities exist in chemistry-related fields? a By solving real-world problems and enabling new careers in research, manufacturing, and health sciences. b Through purely theoretical work with no practical jobs. c By only studying ancient materials with no modern applications. 2 Which is a physical property of matter useful for identifying substances? a Memory capacity of a material b Melting point and density. c Tensile Strength only 3 Why are accuracy and precision important in evaluating experimental results? a They are unrelated to data quality b They determine how close results are to true values and to each other. c They only affect the speed of experiments. 4 Which source of experimental error can be reduced by calibrating instruments regularly? a Gross Error b Systematic error. c Random error. 5 Which approach improves the reliability of results in experiments? a Ignoring outliers and cherry-picking data. b Using one trial only to save time c Careful control of variables and repeated trials. 6 What is a key development in the quantum mechanical model? a Absolute certainty of electron positions b Fixed orbits like Bohr model c Probability-based electron locations rather than fixed paths. 7 Which statement describes writing electronic configurations? a Listing only the nucleus attributes b Filling orbitals according to energy and Pauli principle. c Randomly placing electrons anywhere. 8 In the quantum model, which determines main energy levels and orbitals? a Azimuthal quantum numbers (1,2,3,4....) b Principal quantum numbers and subshells (s, p, d, f). c Magnetic Quantum Numbers (e.g. 1,0,-1) 9 How did Dmitri Mendeleev develop the periodic table? a By organizing elements by properties and leaving gaps for undiscovered elements. b By listing elements alphabetically c By counting protons only 10 Which periodic trend helps predict atomic radius across a period? a Atomic radius generally decreases left to right across a period. b Atomic radius increases across a period c Radius remains constant across a period 11 What is a radioisotope? a A stable isotope with no decay b A synthetic compound with no radiation c A radioactive isotope with a characteristic half-life. 12 Which property can be observed without changing the identity of a substance? a Flammability of a sample of liquid fuel b Reactivity of a sample of solid metal c Density of a sample of liquid water 13 What is an application of isotopes in medicine? a Diagnostic imaging and cancer therapy. b Food coloring only c Structural support in buildings 14 Which field uses isotopes for environmental tracing? a Hydrology and environmental science. b Classical piano performance c Theology and folklore studies 15 What is a practical use of isotopes in industry? a Cooking recipes b Hair dye formulations c Industrial tracers and quality control. 16 A student identifies an unknown liquid by measuring its boiling point. Why is this property useful? a Boiling point can help identify substances b Boiling point can change substances chemically c Boiling point can determine substances' color 17 What does a high ionization energy indicate about an element? a It is easy to remove an electron b It is harder to remove an electron. c It relates to melting point only 18 Two colorless liquids have similar appearances. Which combination of properties would provide stronger evidence for identifying them? a Color and container shape observations b Density and boiling point measurements c Mass and container weight measurements 19 Which property trends left to right across a period? a Increasing electronegativity and ionization energy. b Constant atomic mass c Decreasing atomic number 20 Which type of radiation has no mass and travels fastest? a Beta particles b Alpha particles c Gamma rays. 21 Which radiation is commonly stopped by skin? a Alpha radiation. b Beta radiation c Gamma radiation 22 What is true about half-life in isotopes? a Time for half the mass to vanish b Time for activity to reduce by half. c Time for full decay to zero 23 How do isotopes differ from each other? a Different nuclei but same neutrons b Different electron counts only c Different numbers of neutrons in the nucleus. 24 Why are isotopes useful in medical imaging? a They replace all healthy tissue b Radioisotopes provide tracers in scans. c They are more colorful 25 A student measures the mass of an object three times and obtains 49.9 g, 50.0 g, and 50.1 g. The accepted value is 50.0 g. What do these results demonstrate? a Low accuracy and high precision b High accuracy and high precision c High accuracy and low precision 26 A balance consistently gives measurements of 48.0 g, 48.1 g, and 48.0 g for an object with an accepted mass of 50.0 g. How should the measurements be described? a Accurate but not precise measurements b Accurate and precise measurements c Precise but not accurate measurements 27 Which situation is a common source of experimental error? a Recording measurements using correct units b Repeating trials using the same procedure c Reading a measuring cylinder from an angle 28 A student repeatedly reads a liquid volume above the correct eye level. What is the best way to reduce this error? a Read the liquid level from above b Read the liquid level at eye height c Read the liquid level from below 29 A thermometer gives inconsistent readings during repeated measurements. What should the researcher do first? a Check and calibrate the thermometer b Average only the highest temperature readings c Replace the recorded values with expected values 30 30. What is Avogadro's number used for? a Counting particles in a mole (6.022e23). b Determining color c Measuring energy 31 Which trend affects first ionization energy across a period? a No change across a period b General increase with increasing nuclear charge. c Decrease due to shielding 32 A researcher obtains inconsistent results because room temperature changes during each trial. Which modification would best improve experimental reliability? a Maintain constant temperature throughout all trials b Increase the number of variables during each trial c Change the experimental procedure during each trial 33 Which scientist proposed that electrons occupy specific energy levels around the nucleus? a Niels Bohr b Ernest Rutherford c J. J. Thomson 34 What major idea distinguishes the quantum mechanical model from the Bohr model? a Electrons travel only in fixed circular paths b Electrons remain motionless around the nucleus c Electrons occupy probable regions called orbitals 35 What is the correct electron configuration of oxygen (Z = 8)? a 1s² 2s¹ 2p⁵ b 1s² 2s² 2p⁴ c 1s² 2s⁴ 2p² 36 An atom has an electron configuration ending in 4p³. How many electrons occupy the 4p sublevel? a Three electrons b Four electrons c Two electrons 37 An electron is located in the 3d sublevel. Which statement correctly describes this sublevel? a It has five orbitals and holds ten electrons b It has three orbitals and holds six electrons c It has one orbital and holds two electrons 38 What is the set of quantum number for 2p3 a n=3, l=0, ml=-1, ms= -1/2 b n=2, l=3, ml=-1, ms= 1/2 c n=4, l=3, ml=1, ms= 1/2 39 Which evidence strongly supported Mendeleev's periodic table after his predictions were confirmed? a Newly discovered elements matched his predicted properties b Newly discovered elements had completely different properties c Existing elements were removed from their original positions 40 A radioactive sample has a half-life of 10 years. If its original amount is 80 g, how much remains after 30 years? a 10 grams of the original sample remains b 20 grams of the original sample remains c 40 grams of the original sample remains

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Froggy Jumps

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Chemistry Quiz MarathonVersion en ligne

par Israel Gurrobat

How does chemistry contribute to health, environment, and industry, and what career opportunities exist in chemistry-related fields?

Which is a physical property of matter useful for identifying substances?

Why are accuracy and precision important in evaluating experimental results?

Which source of experimental error can be reduced by calibrating instruments regularly?

Which approach improves the reliability of results in experiments?

What is a key development in the quantum mechanical model?

Which statement describes writing electronic configurations?

In the quantum model, which determines main energy levels and orbitals?

How did Dmitri Mendeleev develop the periodic table?

Which periodic trend helps predict atomic radius across a period?

What is a radioisotope?

Which property can be observed without changing the identity of a substance?

What is an application of isotopes in medicine?

Which field uses isotopes for environmental tracing?

What is a practical use of isotopes in industry?

A student identifies an unknown liquid by measuring its boiling point. Why is this property useful?

What does a high ionization energy indicate about an element?

Two colorless liquids have similar appearances. Which combination of properties would provide stronger evidence for identifying them?

Which property trends left to right across a period?

Which type of radiation has no mass and travels fastest?

Which radiation is commonly stopped by skin?

What is true about half-life in isotopes?

How do isotopes differ from each other?

Why are isotopes useful in medical imaging?

A student measures the mass of an object three times and obtains 49.9 g, 50.0 g, and 50.1 g. The accepted value is 50.0 g. What do these results demonstrate?

A balance consistently gives measurements of 48.0 g, 48.1 g, and 48.0 g for an object with an accepted mass of 50.0 g. How should the measurements be described?

Which situation is a common source of experimental error?

A student repeatedly reads a liquid volume above the correct eye level. What is the best way to reduce this error?

A thermometer gives inconsistent readings during repeated measurements. What should the researcher do first?

30. What is Avogadro's number used for?

Which trend affects first ionization energy across a period?

A researcher obtains inconsistent results because room temperature changes during each trial. Which modification would best improve experimental reliability?

Which scientist proposed that electrons occupy specific energy levels around the nucleus?

What major idea distinguishes the quantum mechanical model from the Bohr model?

What is the correct electron configuration of oxygen (Z = 8)?

An atom has an electron configuration ending in 4p³. How many electrons occupy the 4p sublevel?

An electron is located in the 3d sublevel. Which statement correctly describes this sublevel?

What is the set of quantum number for 2p3

Which evidence strongly supported Mendeleev's periodic table after his predictions were confirmed?

A radioactive sample has a half-life of 10 years. If its original amount is 80 g, how much remains after 30 years?