Here is cbse 2007 question paper of science: CBSE X SCIENCE AND TECHNOLOGY (Theory) 2007 (OUTSIDE DELHI) Time allowed: 2 hours 15 mins; Maximum Marks: 100 General Instructions: | 1) | The question paper comprises of two sections A and B. You are to attempt both sections. | 2) | You are advised to attempt all the questions of Section A and Section B separately. | 3) | All questions are compulsory. | 4) | There is no overall choice. However‚ internal choice has been provided in some questions
Premium Sulfuric acid Acetic acid Chlorine
Caffeine plays a big role in todays society. Caffeine is found in some beverages such as coffee and tea (Sciencedaily.com). Americans consume 400 million cups of coffee per day‚ equivalent to 146 billion cups of coffee per year (The Huffington Post‚ 2011). This made the United States the leading consumer of coffee in the world (The Huffington Post‚ 2011). People never realize the effect caffeine can have on their body. Caffeine could be a reason why you become dehydrated. Can caffeine cause dehydration
Premium
light phosphoric acid to make detergents‚ fertilizers and soft drinks‚ slightly sour but pleasant taste‚ detergents containing phosphates cause water pollution sulfuric acid car batteries‚ to manufacture fertilizers‚ and other chemicals‚ dehydrating agent‚ causes burns by removing water from cells Boric acid In addition to its use as an insecticide‚ boric acid is used in fluxes for jewelry and metalwork. Citric acid Citric acid can be found in many different processed foods and soft drinks
Premium Sulfuric acid Acid Acid dissociation constant
Features of Sand washing machine saled in vipeak Sand washing machine or sand washing plant is widely used in particle aggregate sand screw washing‚ grading and dehydrating quartz and sand in construction site‚ sand stone factories‚ hydropower station and concrete dam site‚ precast concrete factory‚ glass factory and etc‚ so that sometimes it can also be called mineral sand washer. During the sand making process‚ the bucket sand washer has wide application due the strong market demands of artificial
Premium Concrete Construction Sand
who don’t have access to clean water‚ that is more than 2 ½ times the population of the US. Every single person in these conditions has to make a decision that ends in death. They have the choice of drinking the dirty water and becoming sick or dehydrating and becoming sick. And most of these people are children. By the time you have finished reading this sentence one child would have died as one dies every 20 seconds due to water related issues. Sanitation is one reason people don’t have access
Premium Water Millennium Development Goals Poverty
Synthesis and Structure of Alcohols Alcohols can be considered organic analogues of water. H O H R O H Alcohols are usually classified as primary‚ secondary and tertiary. H R H OH H primary R R OH R R OH OH R secondary tertiary phenol Alcohols with the hydroxyl bound directly to an aromatic (benzene) ring are called phenols. Nomenclature of Alcohols (Normally any compound’s name which ends in –ol is an alcohol of some sort) IUPAC rules that:
Premium Alcohol
Organic Chemistry - Introduction 1 2812 Basic definitions for organic chemistry Scope Organic chemistry is a vast subject so it is easier to split it into small sections for study. This is usually done by studying compounds which behave in a similar way because they have a particular atom‚ or group of atoms‚ (FUNCTIONAL GROUP) in their structure. Catenation The ability to form bonds between atoms of the same element. Carbon catenates to form chains and rings‚ with single‚ double
Premium Oxygen Methane Carbon
Grind Jackfruit Seeds as Substitute For Flour Abstract Jackfruit is quiet abundant in our country as a result‚ its seeds are just scattered and not use for other matters aside from that it can be planted again for another Jackfruit tree. Flour is a very important ingredient for every pastries we eat. But because of its high price‚ people don ’t buy or refuse to buy food that contains flour as one of itsingredient. The researcher discovered that Jacfruit seeds isrich in vitamins like complex
Premium Jackfruit Olfaction The Grinder
means of chute flow of liquidity Spiral classifiers are widely used for distributing ore in the close circuit with ball mill‚ grading ore and fine slit in the gravity mill‚ grading granularity in the flow of metal ore-dressing and desliming and dehydrating in the washing. Advantages are simple structure‚ reliable working condition and convenient operation. According to the principle that different grains are
Premium Water Density Inertia
FOOD PRESERVATION Food is preserved to prevent natural and microbial decay‚ by modifying the conditions that favour enzyme activity and the growth of micro-organisms. Foods are preserved for the following reasons: 1. To add variety to the diet‚ by making food available out of season. 2. To make use of food when it is cheap and plentiful and to store it for later use. 3. To vary the diet by preserving food in ways the make a new product out of the food (e.g. pickling‚ jam making).
Premium Food preservation Bacteria