SCIENCE7
Quiz by MERCY PAGLINAWAN
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The particle model of matter explains that all substances are made up of tiny particles. Each pure substance has its unique type of particles, which determine its physical and chemical properties. Which of the following statements best describes the particle model of matter?
29All matter is made up of tiny particles that are evenly distributed throughout different substances.
All matter is made up of tiny particles, and eachpure substance has its own unique type of particles.
All matter is made up of tiny particles that are always the same size and shape, regardless of the substance.
All matter is made up of tiny particles, and different substances share the same kind of particles.
- Q1
The particle model of matter explains that all substances are made up of tiny particles. Each pure substance has its unique type of particles, which determine its physical and chemical properties. Which of the following statements best describes the particle model of matter?
All matter is made up of tiny particles that are evenly distributed throughout different substances.
All matter is made up of tiny particles, and eachpure substance has its own unique type of particles.
All matter is made up of tiny particles that are always the same size and shape, regardless of the substance.
All matter is made up of tiny particles, and different substances share the same kind of particles.
30s - Q2
The particle theory of matter explains that particles are always in motion, have spaces between them, and their behavior changes with temperature. This understanding is key to solving problems involving states of matter and temperature effects. A student heats two containers of different substances—Container A and Container B. Both substances are solid at room temperature. As the student increases the temperature, the particles in Container A begin moving faster and eventually melt, while the particles in Container B remain stationary. Based on the particle model of matter, what can be concluded about the difference between the substances in Container A and Container B?
The particles in Container B have the same attractions as those in Container A but need more heat to start moving.
The particles in Container B have weaker attractions, so they remain stationary, while the particles in Container A move faster because of higher temperatures.
The particles in Container A have stronger attractions, so they move faster when heated.
The particles in Container A have weaker attractions and move faster as the temperature increases, while the particles in Container B have stronger attractions and resist movement.
30s - Q3
The states of matter—solid, liquid, and gas—change based on particle arrangement and energy. Understanding these changes helps explain phenomena like melting, freezing, and boiling. A block of ice is heated until it turns into water and then eventually into steam. Which of the following statements best explains the changes in the particle arrangement and energy during this process?
The particles remain stationary, but their energy increases as the ice changes to steam.
The particles lose energy, move closer together, and form a solid structure as the ice melts into water.
The particles gain energy, move farther apart, andhave increased motion as the ice changes to water and then to steam.
The particles lose energy, but their arrangement becomes more random as the ice melts and evaporates into steam.
30s - Q4
Accurate measurement and data organization are key in scientific investigations. Correctly using standard units ensures reliable results, and properly organizing data allows for clear analysis and interpretation. A student is conducting an experiment to measure the temperature change of water when heated. The student uses a thermometer to record the water’s temperature every 5 minutes for 30 minutes. After collecting the data, the student organizes the results into a table.
Which of the following actions is necessary for ensuring the accuracy and reliability of the experiment’s results?
Using a thermometer with standard units (°C) and organizing the data in a table with time intervals and corresponding temperature readings.
Using a ruler to measure the water’s temperature for better precision.
Recording the temperature using random time intervals instead of fixed intervals.
Estimating the temperature values instead of measuring them directly to save time.
30s - Q5
In chemistry, the concentration of a solution is a quantitative measure of how much solute is dissolved in each volume of solvent. Understanding this concept is crucial for accurately preparing solutions. A scientist dissolves 20 grams of salt in 500 mL of water to prepare a salt solution. What is the concentration of the solution in grams per liter (g/L)?
50 g/L
10 g/L
40 g/L
20 g/L
30s - Q6
In an ecosystem, organisms are classified into trophic levels based on their role in the flow of energy. The food pyramid represents these levels, with producers at the base and top predators at the peak. In a food pyramid, grass is consumed by grasshoppers, which are then eaten by frogs. The frogs are in turn consumed by snakes. Which of the following statements best describes the transfer of energy in this ecosystem?
The frogs receive the most energy from the grasshoppers because they are closer to the top of the pyramid.
The grasshoppers receive more energy from the grass than the snakes receive from the frogs because energy is lost at each trophic level.
The snakes receive the same amount of energy from the frogs as the grasshoppers receive from the grass because energy is evenly distributed.
The grasshoppers receive less energy from the grass than the snakes receive from the frogs because energy increases as you move up the food pyramid.
30s - Q7
In everyday life, objects experience balanced and unbalanced forces, which determine their motion. Balanced forces keep an object at rest or moving at a constant velocity, while unbalanced forces cause acceleration or changes in motion. Which of the following situations best demonstrates unbalanced forces?
A person standing still in an elevator that is not moving.
A book resting on a table.
A fruit falling from a tree.
A car cruising at a constant speed on a straight road.
30s - Q8
In physics, distance and displacement are fundamental concepts that describe movement. Distance refers to the total path traveled, while displacement measures the shortest path from the initial position to the final position, taking direction into account. A hiker walks 3kilometers east, then 4 kilometers north, and finally 2 kilometers west. Which of the following statements correctly describes the difference between distance and displacement in this scenario?
The total distance is 5 kilometers, while the displacement is 9 kilometers north from the starting point.
The total distance is 9 kilometers, while the displacement is 5 kilometers northeast from the starting point.
The total distance is 5 kilometers, while the displacement is 7 kilometers east from the starting point.
The total distance is 9 kilometers, while the displacement is 7 kilometers north from the starting point.
30s - Q9
Uniform velocity refers to the constant speed and direction of an object. It can be visually represented using distance-time graphs, where the slope indicates the speed of the object. A straight line on a distance-time graph signifies uniform velocity. A car travels at a uniform velocity of 60 km/h. Which of the following distance-time graphs best represents this scenario?
A horizontal line.
A straight line with a positive slope.
A line that decreases over time.
A line that curves upwards.
30s
