Four properties of a substance that will never change are its molecular weight, molecular formula, molecular structure, and chemical name. Molecular weight is a measurement expressed in atomic mass units of the amount of atoms or molecules in a substance.
Molecular formula is a representation of the type and number of atoms that make up a specific compound. Molecular structure is the representation of the arrangement of atoms, and their bonding, in a compound.
Chemical name is the standard name of a compound, in accordance with the accepted conventions of chemical nomenclature. All four of these properties of a substance are considered to be constant, and will never change.
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What properties do not change a substance?
The properties of a substance that do not change include its melting and boiling points, color and odor, phase at room temperature, density, and chemical composition. These properties are often referred to as “intrinsic” properties, as they are intrinsic to the substance itself, and they remain constant no matter how the substance is manipulated.
Melting and boiling points indicate the temperature at which a solid will transition to a liquid and a liquid to a gas, respectively. Color and odor are two very recognizable properties of a substance and are often used in testing and identification.
Density is one of the primary properties of a substance, and is more often determined by measuring the mass and volume of a substance. Chemical composition, on the other hand, is defined by the particular arrangement of atoms, ions, and molecules and their related formulas.
This arrangement of composition remains constant no matter the physical state of the substance.
Which property does not change during physical and chemical change?
Mass is a property that does not change during a physical or chemical change. Physical and chemical changes are processes that transform matter from one form to another without changing the chemical compositions.
Mass is a fundamental property of matter that is conserved during all chemical and physical changes. This means that when a substance is subjected to a chemical or physical change, the total mass of the existing materials will remain the same.
Mass is measured in units such as grams, kilograms and pounds, and is the total quantity of matter in an object regardless of its volume or shape.
Are there substances that do not change at all give an example?
Yes, there are substances that do not change at all. An example would be diamond, which is an allotrope of carbon. Diamond is composed of only carbon atoms, arranged in a crystal lattice structure, and is extremely stable in that form.
Diamond is very hard, making it highly resistant to physical and chemical changes, so it remains in its diamond form, unchanged, even when exposed to extreme heat and pressure.
Which state of matter does not change its form?
Solid is the state of matter that does not change its form. Solids are characterized by having a fixed volume and shape, a high degree of structure and high rigidity. This is because all of the particles that make up the solid are held together in a tight network of bonds.
When compared to fluids such as liquids and gases, solids do not easily change shape in response to forces applied to them. Examples of solids include rocks, metals, and ice.
Which property of an object is not changed by a force?
The property of an object that is not changed by a force is its mass. Mass is the amount of matter an object holds and is the same regardless if a force is applied to the object. Even when forces such as gravity and friction act on the object, it does not change the amount of matter that makes up the object.
Momentum, which is the product of mass and velocity, can be changed but the mass is not altered by a force.
Which one is not the property of the mixture of substances?
The property of a mixture of substances that is not shared with a pure substance is compositional variability. This means that a mixture of substances can contain different substances in different proportions, while a pure substance always has a fixed chemical composition.
For example, if you mix sugar and water, the ratio of the two substances in the resulting solution could vary from one to ninety-nine. On the other hand, a pure substance such as oxygen will always have the same chemical composition.
What are the 4 main properties?
The four main properties, also known as the four fundamental properties of matter, are mass, volume, density, and shape.
Mass is a measure of the amount of matter in an object. It is directly proportional to the number of particles in the object and is typically measured in kilograms.
Volume is a measure of the space taken up by an object. It is defined as the amount of space an object takes up in three-dimensional space and is usually measured in cubic meters or liters.
Density is a measure of how much mass is contained within a given volume. It is the ratio of mass to volume and is typically measured in kilograms per cubic meter.
Shape is a measure of the spatial form of an object. It is typically described by the length, width, and height of the object and can be measured in meters, millimeters, or even angstroms.
What are 4 characteristic properties that can be used to identify a substance?
There are four key characteristics used to identify a substance: color, odor, melting/boiling point, and chemical reactivity.
Color: This is usually the first characteristic looked at in identifying a substance. Different colors can suggest different chemical elements or molecules which can be used to narrow down its identity.
Odor: When a substance is heated or dissolved, it can emit a distinct smell. This smell is usually due to the presence of certain volatile organic compounds and can help to determine the type of molecule.
Melting/Boiling Point: Every substance has different melting and boiling points depending on its properties. Measuring the temperatures at which a substance changes state (solid to liquid or liquid to gas) can be used to identify it.
Chemical Reactivity: Every substance reacts differently to different chemicals or conditions. This means that you can use chemical tests to identify its identity by seeing how it reacts.
What are the 4 properties most commonly used to identify a mineral?
The four properties most commonly used to identify a mineral are its color, luster, streak, and hardness. Color is the most obvious property used to identify a mineral and is often the first thing that is observed.
Other important physical properties of minerals include luster, which is basically the visual look of the mineral’s surface and can range from metallic to pearly to dull. Streak is the color of the powdered mineral and can be determined when a mineral is rubbed on a streak plate.
Finally, hardness refers to a mineral’s resistance to scratching and is an important factor when identifying minerals. A mineral’s hardness is determined by a Mohs hardness scale, which ranges from 1 (very soft) to 10 (very hard).
Knowing the values of these four properties can help you to accurately identify a particular mineral with relative ease.
What are the characteristics of pure substances choose 4 answers *?
A pure substance is any singular type of matter that is chemically and physically uniform. Characteristics of pure substances include:
1. Unchanged Composition: A pure substance is composed of only one type of particle. The composition of the substance never changes and cannot be separated into any other substances by physical or chemical means.
2. Definite Properties: Pure substances have properties that are constant. These properties, such as melting point, boiling point, and density, remain the same for any sample of the same substance.
3. Homogeneous Mixtures: Pure substances are homogeneous mixtures of only one type of particle. This means that the particles in the mixture are evenly dispersed throughout the mixture.
4. Intensive Properties: The intensive properties of pure substances such as boiling point, melting point, and density are independent of the amount of the substance present. Therefore, these properties are the same for any sample of the same substance.
