1.
The matter is anything that has
Correct Answer
B. Volume and mass.
Explanation
The question is asking for the characteristics that define matter. Matter is anything that has volume (which refers to the amount of space it occupies) and mass (which refers to the amount of matter in an object). Cells and atoms are not defining characteristics of matter, as there are non-living things that can still be considered matter. Size, shape, weight, and gravity are also not defining characteristics of matter, as they can vary depending on the object's location or conditions.
2.
Quantitative observations
Correct Answer
B. Are measurable and reproducible.
Explanation
Quantitative observations are measurable and reproducible because they involve the use of numerical data and can be repeated or replicated by different individuals or in different settings. This allows for consistency and reliability in scientific research and analysis. Vague and non-scientific observations, on the other hand, lack specificity and cannot be accurately measured or replicated, making them less reliable in scientific investigations.
3.
A change in states of matter that requires heat is
Correct Answer
A. Evaporation.
Explanation
Evaporation is the process by which a liquid changes into a gas, and it requires heat to occur. During evaporation, the molecules of a liquid gain enough energy to break their intermolecular forces and escape into the surrounding environment as gas. This process is commonly observed when water turns into water vapor due to the application of heat, such as when boiling water on a stove. Therefore, evaporation is the correct answer as it describes a change in states of matter that requires heat.
4.
All Matter is made up of
Correct Answer
D. Particles.
Explanation
The correct answer is particles. This is because matter is composed of tiny particles called atoms and molecules. These particles are constantly in motion and interact with each other. They can combine to form different substances and can also exist in different states such as solid, liquid, or gas. Therefore, particles are the fundamental building blocks of all matter.
5.
Describe how the three states of matter behave according to particle theory.
6.
Attractive forces between particles are weakest in
Correct Answer
C. Gases
Explanation
In gases, the particles are widely spaced and have high kinetic energy, resulting in weak attractive forces between them. This is because the intermolecular forces in gases are primarily van der Waals forces, which are weaker compared to the stronger forces present in solids and liquids. In solids, the particles are closely packed and have strong attractive forces, while in liquids, the particles are closer together than in gases, leading to stronger intermolecular forces. Therefore, the correct answer is gases.
7.
Sublimation refers to
Correct Answer
A. Conversion of solid directly into gas
Explanation
Sublimation is the process by which a solid substance transforms directly into a gas, bypassing the liquid state. This occurs when the substance is heated and the vapor pressure of the solid exceeds the atmospheric pressure. As a result, the solid particles gain enough energy to break their intermolecular bonds and escape into the gas phase. Examples of substances that undergo sublimation include dry ice (solid carbon dioxide) and mothballs (solid naphthalene).
8.
Heating and cooling curves are plots of
Correct Answer
D. Temperature against time
Explanation
Heating and cooling curves are plots that show how the temperature of a substance changes over time during the process of heating or cooling. This is represented by plotting the temperature on the y-axis and the time on the x-axis. By observing the curve, one can analyze the rate at which the temperature changes and identify any phase transitions or changes in the substance's state. Therefore, the correct answer is temperature against time.
9.
What is adhesion?
Correct Answer
A. The force that causes a fluid to stick to something.
Explanation
Adhesion refers to the force that causes a fluid to stick to something. It is the attraction between the molecules of a fluid and the molecules of a different substance. This force allows liquids to wet surfaces and form a thin film or layer on them. Adhesion is responsible for phenomena like capillary action, where liquids are drawn up into narrow tubes against gravity. It is an important concept in fields such as physics, chemistry, and biology, as it affects various processes and behaviors of fluids.
10.
What is viscosity?
Correct Answer
B. The thickness of a fluid
Explanation
Viscosity is a measure of the resistance of a fluid to flow or its internal friction. It refers to the thickness or consistency of a fluid, indicating how easily it can flow. A highly viscous fluid, such as honey, has a high resistance to flow and is thick, while a low viscous fluid, such as water, flows easily and is thin. Therefore, the answer "the thickness of a fluid" accurately describes viscosity.