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a,b,c are answerExplanation:HALOGENS and alkali METALS have VALENCY one because they require 1 ELECTRON to gain or lose to attain Nobel gas configuration.

The desert is located in the Tularosa Basin of New Mexico. Its white sands are not composed of quartz, LIKE most desert sands, but of gypsum and CALCIUM SULFATE. ... Rainfall and MELT water came from the mountains causing the gypsum to percolate out and the CONCENTRATED solutions were washed down the mountainsides.

A SHOWS the CORRECT observationExplanation:

tion:ADVANTAGES of a dry cell are:The compact size of a dry cell makes it suitable for powering SMALL electronic devices.The electrolyte used in dry cell is RELATIVELY not so harmful to the environment.Dry cells are inexpensive.

When boiling occurs, the more energetic molecules change to a gas, SPREAD out, and form BUBBLES. In addition, gas molecules leaving the liquid remove thermal ENERGY from the liquid. Therefore the TEMPERATURE of the liquid remains CONSTANT during boiling.

what and how MUCH can be MIXED into SOMETHING

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the PICTURE ️ is REQUIRED for US to ANSWER

transfer POLLEN GRAINED from the ANOTHER to the stigma of a different flower transfers limited NUMBER of pollens required pollination to transfer pollen grained it occurs in both unisexual and bisexual flowers hope that u R helpful Explanation:please follow ,thank and brainylist please

e KAHA tha kimujhe kuchh samajh nhi AAYA kya KARNA haiand kya jo.in karna hai aur KAISE?

ening GUYSHOPE you all are FINE

tion:is a Sanskrit WORD that means "DIVINE offering". It is not only a given name, but also the name given to the greeting between Hindus, Buddhists and other RELIGIONS on the Indian subcontinent: hands FOLDED together.

tion:1.movement, or a TENDENCY to move, TOWARDS a centre of gravity, as in the FALLING of BODIES to the earth.2.movement towards or attraction to SOMETHING.

Pure AIR is free from germs and HARMFUL gases. It CONTAINS 78% nitrogen, 21% oxygen and small AMOUNT of other gases and dust particles. Polluted air contains harmful gases and unwanted substances.

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the molar Mass of water (H2O) can be calculated by adding the molar masses of the individual ELEMENTS present. Molar Mass of H2O = (2x1) + 16 = 2 + 16 = 18g/molThe molar mass of the chemical substance is equal to the SUM of the atomic mass of the individual atoms. Given Atomic mass of H = 1u Atomic mass of N = 14 U Atomic mass of O = 16u The molar mass of HNO3 is (1 × 1) +(1 × 14) + (16×3) = 63 u.Explanation:

tion:a) Fast changes occur with in SECONDS or minutes. Whereas SLOW changes take place very SLOWLY and may take HOURS, DAYS or months to complete. Examples for fast changes: Burning of paper, Burning of a candle. Examples for slow changes: Rusting of iron, Germination of seed, curdling of milk etc.

Some signs that a chemical change occurred include temperature increase, spontaneous change in color after MIXING compounds, a marked odor after the reaction BEGINS, formation of a precipitate in the SOLUTION and release of bubbles.Explanation:HOPE IT HELPS........

A pallet is a flat transport structure, which supports GOODS in a stable fashion while being lifted by a FORKLIFT, a pallet JACK, a front loader, a jacking device, or an erect crane. A pallet is the structural foundation of a UNIT load which allows handling and STORAGE efficiencies.

LeadExplanation:

Coal is a COMBUSTIBLE black or brownish-black sedimentary rock, formed as rock strata called coal seams. ... Coal is formed when dead plant MATTER decays into PEAT and is converted into coal by the HEAT and pressure of deep burial over millions of years.hope it helps YOUPLEASE mark me brainliest

Air is a mixture of several gases, where the two most dominant components in dry air are 21 vol% oxygen and 78 vol% nitrogen. Oxygen has a molar mass of 15.9994 g/mol and nitrogen has a molar mass of 14.0067 g/mol.Air pollution is the presence of SUBSTANCES in the atmosphere that are harmful to the health of humans and other living beings, or cause damage to the climate or to materials. There are different types of air pollutants, such as gases (such as ammonia, carbon monoxide, sulfur dioxide, nitrous oxides, methane and chlorofluorocarbons), particulates (both organic and inorganic), and biological molecules.ACID rain is a rain or any other form of precipitation that is unusually acidic, meaning that it has elevated levels of hydrogen ions (low pH). It can have harmful effects on plants, aquatic animals, and infrastructure. Acid rain is caused by emissions of sulphur dioxide dioxide and nitrogen oxide, which react with the water molecules in the atmosphere to PRODUCE acids. Some governments have made efforts since the 1970s to reduce the release of sulfur dioxide and nitrogen oxide into the atmosphere with POSITIVE results. Nitrogen oxides can also be produced naturally by lightning strikes, and sulphur dioxide is produced by volcanic eruptions. Acid rain has been shown to have adverse impacts on forests, freshwaters, and soils, killing insect and aquatic life-forms, causing paint to peel, corrosion of STEEL structures such as bridges, and weathering of stone buildings and statues as well as having impacts on human health.Explanation:

asil and aloe VERA are very useful in the TREATMENT of fungal DISEASES such as ECZEMA and RINGWORM.

Law of definite proportionsChemical notationDiscovery of elements BERZELIUS is credited with discovering the chemical elements cerium and selenium and with being the first to isolate silicon and thorium. Berzelius discovered cerium in 1803[21] and selenium in 1817.[22] Berzelius discovered how to isolate silicon in 1824,[23] and thorium in 1824.[24][25] Students working in Berzelius's laboratory also discovered lithium, lanthanum, and vanadium.[26] Berzelius discovered silicon by repeating an experiment PERFORMED by Gay-Lussac and Thénard. In the experiment, Berzelius REACTED silicon tetrafluoride with potassium metal and then purified its product by washing it until it became a brown powder. Berzelius recognized this brown powder as the new element of silicon, which he called silicium,[27] a name proposed earlier by Davy.[28] Berzelius was the first to isolate zirconium in 1824, but pure zirconium was not produced until 1925, by Anton Eduard van Arkel and JAN Hendrik de Boer.[29]Explanation:

It is because iodine is a sublime SUBSTANCE that is, it is converted DIRECTLY into vapours when it is HEATED WITHOUT going into the liquid state. Whereas sand in non sublime. Therefore when the mixture is heated iodine will sublime and sand will be left behind separating the both.Explanation:hope this will HELP you ☺️☺️☺️

hi all just to be the same and SURFACE bf bf er moto g and 0 I can't FIND a different KIND you have GF ko aur wo MERE liye to

Alva EDISON was born on FEBRUARY 11, 1847 in Milan, Ohio; the seventh and last child of Samuel and Nancy Edison. When Edison was seven his family moved to Port HURON, Michigan. Edison lived here until he STRUCK out on his own at the AGE of sixteen.

Zn + H2SO4 = ZnSO4 + H2 | Chemical REACTION and equation. I hope it is HELPYOU

Sewage wastewater includes: (i) Waste water GENERATED in houses during bathing, WASHING and cleaning kitchen UTENSILS, which contains detergent and dirt as well as faeces and urine. (ii) Wastewater generated in industries and HOSPITALS, which contains poisonous chemicals.I hope it helps.. please MARK as Brainlist

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Elements are the simplest complete chemical substances. Each element CORRESPONDS to a single entry on the periodic table. An element is a material that consists of a single type of atom. ... A COMPOUND consists of TWO or more types of elements held together by covalent or ionic bonds.Explanation:hope it helps u

AgricultureExplanation:We use chemicals to KILL PESTS, but it affects the production-level of AGRICULTURE.