1. What is meant by a pure substance?
2. List the point of differences between homogeneous & heterogeneous mixture?
3. Classify the following into elements, compounds & mixture:
a) Sodium b) Soil
c) Sugar Solution d) Silver
e) Calcium carbonate f) Silicon
g) Coal
h) Air
i) Soap
1) Methane
k) Carbon dioxide
4. Why the cell is called the structural & functional unit of life?
5. Write the main point of differences between prokaryotic & eukaryotic cell?
6. Which organelle is known as the powerhouse of the cell? Why?
7. Distinguish between speed & velocity
8. Define acceleration. Write its SI unit.
9. What is the nature of the distance-time graph for uniform & non-uniform motion of an
object?
10. Under what condition is the magnitude of average velocity of an object equal to its
average speed?
moon
Answers
Answer:
A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds. Mixtures can be classified as homogeneous or heterogeneous.
A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly different substances or phases. The three phases or states of matter are gas, liquid, and solid.
Elements →
The elements are regarded as the building blocks of the universe.
Sodium, Silver, Tin and Silicon are elements.
Compounds →
It is a pure substance made up of two or more elements chemically combined in a fixed proportion by mass.
Calcium carbonate, Methane and Carbon dioxide are compounds.
Mixture →
It is a substance containing two or more substance in any proportion.
Soil, Sugar, Coal, Air, and seawater are mixtures.
Each organ in our body is all made of cells. Cells divide and multiply in order to form new organs and gametes too. ... The cell is called the structural and functional unit of life as all living organisms are made up of cells. Cells are also essential for performing various life processes required for sustaining life.
Depending upon the internal structure of the cell, two types of cells are found in an organism namely Eukaryotic and Prokaryotic
Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell.
Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. ... On the other hand, velocity is a vector quantity; it is direction-aware. Velocity is the rate at which the position changes.
acceleration (symbol: a) is defined as the rate of change (or derivative with respect to time) of velocity. It is thus a vector quantity with dimension length/time². In SI units, acceleration is measured in meters/second² using an accelerometer.
For uniform motion, the distance-time graph is a straight line parallel to the time axis as speed will be constant. The distance-time graph for non-uniform motion is not a straight line since speed is variable, it can be a curve or a zigzag line.
Average velocity would be equal to average speed when the total distance travelled equals the net displacement of a particle. This happens when a particle moves along a straight line in a fixed direction.
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bu
Answer:
A pure substance is a form of matter that has a constant composition and properties that are constant throughout the sample. Mixtures are physical combinations of two or more elements and/or compounds. Mixtures can be classified as homogeneous or heterogeneous.
A homogeneous mixture has the same uniform appearance and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly different substances or phases. The three phases or states of matter are gas, liquid, and solid.
Elements →
The elements are regarded as the building blocks of the universe.
Sodium, Silver, Tin and Silicon are elements.
Compounds →
It is a pure substance made up of two or more elements chemically combined in a fixed proportion by mass.
Calcium carbonate, Methane and Carbon dioxide are compounds.
Mixture →
It is a substance containing two or more substance in any proportion.
Soil, Sugar, Coal, Air, and seawater are mixtures.
Each organ in our body is all made of cells. Cells divide and multiply in order to form new organs and gametes too. ... The cell is called the structural and functional unit of life as all living organisms are made up of cells. Cells are also essential for performing various life processes required for sustaining life.
Depending upon the internal structure of the cell, two types of cells are found in an organism namely Eukaryotic and Prokaryotic
Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell.
Speed, being a scalar quantity, is the rate at which an object covers distance. The average speed is the distance (a scalar quantity) per time ratio. ... On the other hand, velocity is a vector quantity; it is direction-aware. Velocity is the rate at which the position changes.
acceleration (symbol: a) is defined as the rate of change (or derivative with respect to time) of velocity. It is thus a vector quantity with dimension length/time². In SI units, acceleration is measured in meters/second² using an accelerometer.
For uniform motion, the distance-time graph is a straight line parallel to the time axis as speed will be constant. The distance-time graph for non-uniform motion is not a straight line since speed is variable, it can be a curve or a zigzag line.
Average velocity would be equal to average speed when the total distance travelled equals the net displacement of a particle. This happens when a particle moves along a straight line in a fixed direction.
Explanation: