# data[].attributes.body
1. Pure Substance​ – a sample of matter that has definite chemical & physical properties and cannot be broken down further by any physical means.

2. Element​ - pure substance that cannot be separated into simpler substance by physical

or chemical means.

3​. Compound- pure substance composed of two or more different elements combined in a fixed ratio joined by chemical bonds.

Properties of compound:

a. Made of elements in a specific ratio that is always the same i. Water is H​ 2​ 0 – It will always will have 2 hydrogen atoms and 1 oxygen atom joined together
b. Can only be separated by chemical means, not physically
c. Have their own physical and chemical properties d. Chemical and physical properties are different than the elements they are made from

i. Example H2​O Hydrogen is a gas Oxygen is a gas Water is a liquid at room temperature

Mixtures

Mixtures​ – a combination of two or more pure substances that are not chemically

combined. Substances held together by physical forces, not chemical.

a.No chemical change takes place

b.Each item retains its properties in the mixture

c.They can be separated physically

# data[].attributes.body
Diseases that occur due to lack of nutrients over a long period are called deficiency diseases or nutritional disease. Deficiency of one or more nutrients can cause diseases or disorders in our body. For example, wheat is rich in carbohydrates, but poor in nutrients like proteins and fats.

# data[].attributes.body
https://byjus.com/biology/human-digestive-system/

# data[].attributes.headline
 Cellular Organisation Eukaryotic Cells Photosynthesis Factors affecting Photosynthesis Respiration Digestion Deficiency Diseases Pure and impure substances -elements, compounds and mixtures Properties of elements, compounds and mixtures Comparing elements and compounds Exothermic and endothermic change Comparing elements and compounds (pure substance) with mixtures (impure substances) Types of mixtures Various Separation techniquesUnit:Understanding measurements Scalar and vector quantity Concept of distance, displacement, time, speed and acceleration.       Plot graphs of distance against time and speed against time, based on given data. Explore real-life situations using the equation: speed = distance/time Heat as a form of energy Concept of temperature Scales of temperature Heat transfer: conduction, convection and radiation

# data[].attributes.subject
 Cellular Organisation Eukaryotic Cells Photosynthesis Factors affecting Photosynthesis Respiration Digestion Deficiency Diseases Pure and impure substances -elements, compounds and mixtures Properties of elements, compounds and mixtures Comparing elements and compounds Exothermic and endothermic change Comparing elements and compounds (pure substance) with mixtures (impure substances) Types of mixtures Various Separation techniquesUnit:Understanding measurements Scalar and vector quantity Concept of distance, displacement, time, speed and acceleration.       Plot graphs of distance against time and speed against time, based on given data. Explore real-life situations using the equation: speed = distance/time Heat as a form of energy Concept of temperature Scales of temperature Heat transfer: conduction, convection and radiation