What does chemistry study about substances and their reactions?
Their composition, properties, internal structure, changes, and reaction mechanisms.
What distinguishes a chemical change from a physical change?
A chemical change alters composition, while a physical change alters energy or aggregate state without changing composition.
What happens to a substance’s composition during a chemical change?
It changes, producing a substance that is no longer the same.
What property of matter is measured in kilograms?
Mass.
What equation relates weight force, mass, and gravitational acceleration?
According to Isak Newton, what is the gravitational force between two bodies?
What is Einstein’s mass–energy relation, attributed to Albert Einstein in 1905?
What defines a homogeneous substance’s composition?
It is uniform.
What kinds of matter make up a heterogeneous substance?
More than one kind of matter.
What defines a pure substance’s chemical composition?
It is precisely defined and constant.
What do the components of a mixture retain?
Their characteristic properties.
How can heating separate a mixture’s components?
Vapour is condensed to recover the components.
What does distillation leave behind when separating a liquid solution?
Less volatile substances.
Which physical properties characterize pure substances?
Color, odor, aggregate state, melting point, boiling point, and solubility.
How are chemical properties of pure substances determined?
Through reactions that transform them into other substances.
What distinguishes elements from compounds in chemical decomposition?
Elements cannot be chemically decomposed, whereas compounds can be decomposed into elements.
What is analysis in chemistry?
The chemical decomposition of a compound into elements.
What is synthesis in chemistry?
The chemical combination of elements to form a compound.
Which work gave Robert Boyle’s early definition of a chemical element?
The Sceptical Chymist (1661).
How did Robert Boyle define an element in The Sceptical Chymist?
A basic substance that cannot be decomposed into simpler substances or formed from them.
What does the law of conservation of mass state about a chemical reaction?
The total mass of all substances involved does not change.
What does Proust’s law state about the elements in a given compound?
They always occur in a constant mass ratio.
According to Dalton’s law of multiple proportions, what ratios occur when two elements form multiple compounds?
Small whole-number ratios of the masses of one element combining with a fixed mass of the other.
According to Dalton’s atomic theory, how small are atoms?
Atoms are extremely small particles.
According to Dalton’s atomic theory, what happens to atoms during chemical reactions?
They cannot be divided.
According to Dalton’s theory, how do atoms of the same element compare?
They are identical in mass, size, and chemical properties.
According to Dalton’s theory, how do atoms of different elements compare?
They differ in mass, size, and chemical properties.
According to Dalton’s theory, what kinds of atoms make up compounds?
Atoms of more than one element.
According to Dalton’s theory, how many atoms of each element does a compound contain?
A fixed number.
According to Dalton’s theory, what can happen to atoms during a chemical reaction?
They can be separated, combined, or rearranged.
According to Dalton’s theory, what happens to atoms’ total number during a chemical reaction?
They are neither created nor destroyed.
What volume ratios does Gay-Lussac’s law describe at constant temperature and pressure?
Reacting or produced gas volumes are in ratios of small whole numbers.
What does physics study, and why do physics and chemistry overlap?
Physics studies states of substances, energy, and energy transformations; chemical reactions involve energy changes.
What happens to platinum wire when it is heated?
It glows and emits light without changing its characteristic properties.
What does heated magnesium wire produce when it burns?
White magnesium oxide.
What physical process accompanies the burning of heated magnesium wire?
Heating the wire.
Which six major branches of chemistry does the course identify?
Inorganic, organic, general, analytical, and biochemistry, and chemical technology.
What gravitational acceleration does Earth have in the given statement?
What equation gives the kinetic energy of moving matter?
According to Einstein’s theory, what mass is associated with energy?
How much energy does fission of 1 kg of uranium-235 release?
What density is given for pure gold?
19.3 g/cm³.
What determines a mixture’s properties?
The amounts and properties of its components.
Which gas mixture is an example of a homogeneous mixture?
Air.
Which metals make up brass?
Copper and zinc.
Which force does centrifugation use to separate mixtures?
Centrifugal force.
What particle-size range does filtration separate from dissolved particles?
Colloidal particles sized 1 nm to 1 μm.
How does flotation separate hydrophobic solids from hydrophilic solids?
Bubbles carry hydrophobic particles to the surface.
What does fractional distillation gradually separate?
Substances with very close boiling points.
Which vapours condense first when distilling a liquid mixture?
Vapours of the most volatile substances.
What transition defines sublimation and enables separation?
The direct transition between solid and gaseous states.
How can a pure substance’s definite melting point be used?
To identify its composition and assess its purity.
What does analysis produce when mercury oxide decomposes?
Mercury and oxygen.
What does synthesis produce when mercury combines with oxygen?
Mercury oxide.
How many chemical elements occur naturally, approximately?
About 110.
Where are chemical elements beyond those occurring naturally obtained?
In laboratories.
Which scientist reported 92 elements in Earth’s crust?
F. W. Clarke.
What fraction of Earth’s crust do oxygen and silicon together make up, according to F. W. Clarke?
Half.
What remains constant in Landolt’s statement for a closed system that cannot lose energy?
The sum of matter and energy, or their masses.
What is the stated mass composition of water?
11.11% hydrogen and 88.89% oxygen.
How do Daltonides and Berthollides differ in chemical composition?
Daltonides have constant composition; Berthollides have variable composition.
Which nitrogen-to-oxygen mass ratios are listed for nitrogen oxides at a fixed nitrogen mass?
14:8, 14:16, 14:24, 14:32, and 14:40.
Which chemist and year are attributed to Richter’s law of equivalent masses?
Benjamin Richter (1762–1807), 1789 god.
What volumes of hydrogen and oxygen produce water vapour, and in what volume?
Two volumes of hydrogen and one volume of oxygen produce two volumes of water vapour.
What volumes of hydrogen and chlorine produce hydrogen chloride, and in what volume?
One volume of hydrogen and one volume of chlorine produce two volumes of hydrogen chloride.
What volumes of hydrogen and nitrogen produce ammonia, and in what volume?
Three volumes of hydrogen and one volume of nitrogen produce two volumes of ammonia.
How is one mole defined using carbon-12 atoms?
It contains as many particles or groups of particles as there are atoms in 0.012 kg of carbon-12.
Answer 27 questions on Foundations of Chemistry.
1. Which set of subjects falls within the scope of chemistry?
2. A material changes from a solid to a liquid while keeping the same chemical composition; how should this change be classified?
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