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tion:When a PIECE of MAGNESIUM ribbon is ignited, light and heat are produced. Purpose/Goal: A quick demonstration which illustrates the concept of an exothermic reaction, as well as one that PRODUCES light energy. The heat of FORMATION of magnesium oxide is -601.83 kJ/mol

Acids and metal carbonatesWhen acids react with CARBONATES, such as calcium carbonate (found in chalk, limestone and marble), a SALT, WATER and carbon DIOXIDE are made. The carbon dioxide CAUSES bubbling during the reaction, which is observed as fizzing.Explanation:have a nice day ✌️✌️

Ripening of fruit and Rusting of IRON are chemical changes.All the OTHERS are PHYSICAL change

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ksbv hs NHS HSK how JKW JACK ki wow is wu w the world of the world of the world of the world of the world of the 3prize is your age and you are EXPLANATION:the first is the winner of the world cup in leggings for the first time in leggings for the first time in leggings for the first time in leggings and has been on bhabhi SINCE she33 was wai

HCI The BOND between hydrogen and chlorine in HClHCl is a polar covalent bond. It is formed by SHARING of an electron pair between the TWO atoms. Since chlorine is more electronegative than hydrogen, it pulls the shared electron pair more strongly towards itself, thus ACQUIRING a PARTIAL negative charge while hydrogen acquires a partial positive charge. Thus, the bond is polar in nature.

I THINK nitrogen EXPLANATION:pls MARK me as BRAINLIEST pls

While it's TRUE that when a CRYSTAL of the ionic substance sodium chloride is dissolved in WATER the sodium and chloride ions separate from one another, they do not separate to form lumps of sodium metal or to form CHLORINE gas. Rather, they remain as single Na+ and Cl− ions, SURROUNDED by water molecules.I hope this answer is help you

(If you don't have much time then straightaway start reading from the Main Explanation)Intro type:High heels or spiked heels are damaging to hardwood flooring. They strike the floor with more force per inch than an elephant's foot. High or spiked heels in disrepair are especially harmful, as the heel acts much LIKE a tiny hammer POUNDING away at the floor with as much force as 10,000 pounds per inch!Water pressure increases as depth increases. ... *How can a woman wearing high heels exert a greater pressure on the floor than another woman of equal MASS wearing work BOOTS? The woman's mass is spread out onto a greater area with the work boots causing the amount of pressure exerted to be lower.Main Explanation:Force is mass multiplied by acceleration. In this SITUATION, the force is your weight: your mass (which on earth, weight is defined as the same quantity as your mass) times gravity (the acceleration).Pressure is having that amount of force narrowed down to a specific surface area.So say you are 120 pounds (the amount of force). You lie down on the floor—the pressure is your weight is distributed all along the parts of your body touching the ground.Say you stand on your feet: there is more pressure onto the floor because now your weight is distributed only into the soles of both feet.Now you have stiletto hells [sic]. We all know from experience that it’s the heels, and not the forefoot area of the shoes that cause damage to flooring. That’s because the surface area is often less than a square inch for both heel tips. That’s a 120 pounds of force applied to less than a square inch of surface area when standing on the heels of your feet while in stiletto heel shoes!! That’s a lot of pressure!

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The bulb may not glow because of the following reasons:1. Liquid in the beaker may be non-conducting. In such a case, the electric current would not be ABLE to pass through the liquid. Hence, the circuit will not be complete. 2. The conductivity of the liquid may be very LOW and so the current flowing through the circuit may be too weak to PRODUCE enough heat in the filament of the bulb so as to make it glow. 3. The battery may be exhausted and does not have sufficient ENERGY to generate electricity. 4. The bulb may be FUSE. 5. Connections may be loose

tion:Physical changes only change the APPEARANCE of a substance, not its chemical composition. Chemical changes cause a substance to change into an ENTIRELY substance with a NEW chemical formula. Chemical changes are also KNOWN as chemical reactions.

it is 48.84% magnesiumExplanation:PLEASE MARK as BRAINLIST

The requirements of the cotton plant...............Constant temperatures between 18 and 30°. Ample SUNSHINE and fairly dry CONDITIONS. A MINIMUM of 500 mm of water between GERMINATION and BOLL formation. Deep, well-drained soils with good nutrient content.

The composition of BRASS, generally 66 percent copper and 34 percent ZINC, makes it a favorable substitute for copper BASED jewelry as it EXHIBITS greater resistance to corrosion.

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Yarn is a long continuous length of interlocked fibres, suitable for use in the production of textiles, sewing, crocheting, knitting, weaving, embroidery, or ropemakingFibres are very thin, thread-like strands from which fabrics or CLOTH is made.Ginning is a process that QUICKLY and easily separates COTTON fibers from their seeds.Explanation:Hope it HELPS !!!Please do MARK as Brainliest !!!

ibres include seed hairs, such as cotton; STEM (or bast) fibres, such as flax and hemp;leaf fibres, such as SISAL; and HUSK fibres, such as coconut. Animal fibres include wool, hair and SECRETIONS, such as silk.

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tion:18.02 gramsThe number of atoms is an exact number, the number of MOLE is an exact number; they do not affect the number of significant figures. The AVERAGE MASS of one mole of H2O is 18.02 GRAMS

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If you like the answer PLEASE follow me on the brainly Explanation:The natural colour of wool is GENERALLY creamy white though some BREEDS of sheep produce wool having brown and black colours. The under-fur of Kashmiri goat is SOFT. It is WOVEN into fine shawls called Pashmina Shawls. Means True

It does not support combustionExplanation:LIGHTER or heavier does not matters(CO2 is heavier than O2). CO2 does not support COMBUSTION and this property makes it useful in FIRE extinguishers.

option 4. Explanation:Bakelite- it is used to MAKE the handles of the UTENSILS so that it does not get heated and it becomes easy to handle the cookware while cooking.PET- PET (also abbreviated PETE) is short for polyethylene terephthalate, the chemical name for polyester. Rayon- Rayon is mixed with cotton to make bed sheets or mixed with wool to make carpets.

it may CAUSE even death to babyExplanation:by TAKING TAKIN through mouth

Galvanization is the method of COATING iron with zinc to prevent rusting. Hot dip electroplating method is used to apply zinc coating. Zinc PREVENTS the FORMATION of layer of OXIDE on the iron which in the presence of air and WATER leads to rust formation.

Pure substances are defined as substances that are made of only one TYPE of atom or only one type of molecule (a group of atoms bonded TOGETHER). An IMPURE SUBSTANCE is made of two or more elements or compounds that are not bonded together chemically.PLEASE MARK MY ANSWER AS THE BRAINIEST ANSWER

The ENERGY difference between (n-1)d and ns subshell is very less. Transition metals have (n-1)d and ns electrons. After losing some s and d electrons, transition metals can acquire immediate half-filled and fully filled stable configurations. They MAY have more than one such OXIDATION states.Since both (n-1) d and ns take PART in CHEMICAL bond formation.Option C is correct.

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