9C Class Blog

LEARNING OUTCOMES : By the end of the lesson students should be able to… State that mass is a measure of the quantity of matter in an object at rest relative to the observer State that weight is a gravitational force on an object that has mass Define gravitational field strength as force per unit mass; recall and use the equation g = W/m and know that this is equivalent to the acceleration of free fall Know that weights (and masses) may be compared using a balance Describe, and use the concept of, weight as the effect of a gravitational field on a mass 

 

  The mass of an object is the amount of matter it is made of. Mass is measured in kilograms. Density is a property of material. It tells us how concentrated its mass.

  Reproduction means producing new living organisms. Animals and plants reproduce to make new individuals of the same species. There are two types of reproduction: asexual and sexual reproduction. View complete notes on the topic "Reproduction" from the PDF file below.

  The blood, pumped by the heart, travels all around the body in blood vessels. It leaves the heart in arteries and returns in veins. Valves, present in the heart and veins, ensure a one-way flow for the blood. As blood enters an organ, the arteries divide into smaller arterioles, which supply capillaries. In these vessels the blood moves much more slowly, allowing the exchange of materials such as oxygen and glucose, carbon dioxide, and other wastes. Blood leaving an organ is collected in venules, which transfer it on to larger veins. View complete notes on the topic "Transport in animals" from the PDF file below.

The CELL is the smallest unit of life that can carry on all the processes of life. Cells contain a variety of internal structures called organelles. An organelle is a cell component that performs specific functions for the cell. All living cells arise from pre-existing cells by division. View complete notes on the topic "Organisation of the organism" from the below PDF file.

  Time Time can be measured using a stopwatch or stopclock which are usually accurate to one or two decimal places. The units of time normally used are seconds or minutes although other units may be used for extremely slow reactions (e.g. rusting). 1 minute = 60 seconds. Temperature Temperature is measured using a thermometer which can normally give readings to the nearest degree. Digital thermometers are available which are more accurate. The units of temperature are degrees Celsius (oC). Mass Mass is measured using a digital balance which normally gives readings to two decimal places. These must be tared (set to zero) before use. The standard unit of mass is kilograms (kg) but in chemistry grams (g) are used most often. 1 kilogram = 1000 grams. View complete notes on the topic "Experimental Techniques" from the below PDF file.

Chemistry 2023 February/March Multiple Choice Extended (QP) Multiple choice Extended (MS) Theory Extended (QP) Theory Extended (MS) Theory Core (QP) Theory Core (MS) Alternative to practical (QP) Alternative to practical (MS) Multiple Choice Core (QP) Multiple Choice (MS) Practical Test (QP) Practical Test (MS)

  This is a nice app to revise mcqs of biology, chemistry and physics. You have to download the app from the playstore.  You can view your score once you answer all the questions of the paper. Click on the link below to install the app. https://play.google.com/store/apps/details?id=com.devoup.mcqer&pli=1

 

What is Chemistry? Chemistry is the study of nature and properties of matter and also the changes that these substances undergo under different conditions. What is Matter? Matter is anything that has mass and occupies space. Mass: amount of matter contained in an object. Volume: amount of space occupied by an object. Energy interacts with matter. (Energy is the ability to do work). View complete notes on the topic states of matter from the below PDF file.

Atoms are the building blocks of matter. Learn more about the atoms through the following video

Chemical elements are the fundamental building blocks of matter. Each element is a pure substance composed of atoms, all of which have the same number of protons in their atomic nuclei. The periodic table of elements organizes these elements based on their atomic number, which corresponds to the number of protons in an atom of the element. As of my last knowledge update in September 2021, there are 118 known elements, with the first 94 elements occurring naturally and the rest being artificially synthesized. Here are some examples of well-known chemical elements: Hydrogen (H) - The lightest element and the most abundant element in the universe. Helium (He) - Known for its low density and use in filling balloons. Oxygen (O) - Essential for respiration and combustion. Carbon (C) - The basis for organic chemistry and the element of life. Iron (Fe) - A common element in Earth's crust and important in steel production. Gold (Au) - A precious metal known for its beauty and rarity. Ur