Do you remember what we’ve been studying in Science? Matter

What properties define matter? – Mass – measured in grams – Volume – measured in ml or cm³ – Weight – measured in grams, ounces, pounds, etc. – Density – measured in g/cm³

How do we measure these things? A triple beam balance measures… – Mass A spring scale measures… – Weight Water displacement can help measure… – Volume of an irregular shaped item

We use formulas to calculate measurements. To find Mass - M= d x v To find Volume – V= m ÷ d or V = l x w x h To find Density – D= m ÷ v

What are Physical and Chemical properties of matter? Physical properties – something that can be observed or measured without changing the identity of the substance. Chemical properties – describes a substance’s ability to form new substances with new properties

Examples of Physical Properties Mass, weight, volume, density Color, size, shape Texture, hardness, luster Conductivity, magnetism, ductility Solubility, malleability, state of matter Melting point, freezing point, boiling point

Examples of Chemical Properties Reactivity to other substances Oxidation (reaction to oxygen that forms rust) Combustion (reaction to oxygen that releases heat) Ripening, flammability

Today we will learn about Conservation of Mass Mass cannot be created or destroyed in ordinary chemical and physical changes Mass is conserved For example: melting ice into water or boiling water. When these physical changes occur, the mass of the substance remains the same. Another example : mixing baking soda with vinegar. When they are combined, a gas is produced and the mass remains the same.