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Please make me explain that if hydrogen (H2) and oxygen (O2) reacts to form water (H2O) then why 2 is along with H since we know that valency of h is 1?

Posted by आदित्य कुमार झा 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

ᵐⁱˢˢ Lucid Dream 4 years, 6 months ago

Water which is H2O, two atoms of hydrogen combine with one atom of oxygen. The valency of oxygen is 2, because it needs two atoms of hydrogen to form water.

Mohammad Sheeraz 4 years, 6 months ago

Because the valency of O is 2 and by cross multiplication : ELEMENT= H O VALENCY= 1 2 COMPOUND = H2O

ANSWER

??????

Posted by आदित्य कुमार झा 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Nithya Sri 4 years, 6 months ago

Indian flag

आदित्य कुमार झा 4 years, 6 months ago

Utkarsh Goyal 4 years, 6 months ago

This is India

3Thank You

ANSWER

what is nerv cell

Posted by Harsh Ojha 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Shreeja Sasi 4 years, 6 months ago

The basic unit of communication in the nervous system is the nerve cell (neuron). Each nerve cell consists of the cell body

ANSWER

With the help of centripetal force how could newton conclude that f proportional to 1/r² ?

Posted by Bubbly Cs 4 years, 6 months ago

CBSE > Class 09 > Science

0 answers

ANSWER

What ? is gravitational force its types its value and its si unit

Posted by Stu Dent 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Suchitra Sen 4 years, 6 months ago

It is the attraction force between any two bodies. It is non contact force and it's value is 6.67*10to the power -11(minus eleven). It's SI unit is newton meter square per kilogram square

Sandeep Kumar 4 years, 6 months ago

It is attraction force between any two bodies in the universe.it is type of non contact force and it so unit is newtons

ANSWER

???? ?? ?????????

Posted by Tinnu Lodha 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

आदित्य कुमार झा 4 years, 6 months ago

Stu dent Mt khel bro

Anushka Jalan 4 years, 6 months ago

A object having mass ocuppying space and has volume is a substance

ANSWER

What are connective tissue ? Classify on the basis of location and function ?

Posted by Raj Kasar 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Narsingh Panwar 4 years, 6 months ago

thank you so much

ANSWER

Give some examples of non aqueous solutions.

Posted by Mitali Mousam 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Sandeep Kaur 4 years, 6 months ago

Examples of non-aqueous solutionsare solutions used in dry cleaning (asolution of ethene in the solvent dichloromethane). A solid solution is asolution in which a solid is the solvent.An example is a brass solution that is formed by dissolving copper in zinc.

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1. What is the nature of force which (a) keeps a satellite revolving round the earth? (b) keeps moon revolving round the earth ? (c) keeps the earth revolving round the sun ?

Posted by Bubbly Cs 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Nithya Sri 4 years, 6 months ago

It is an example of centripidal force and also

Yagyesh Jaiswal 4 years, 6 months ago

ANSWER

Acne is caused by

Posted by Shafat Hasan 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Nithya Sri 4 years, 6 months ago

Staphylococci an bacteria which causes acne

Jaya Chaudhary 4 years, 6 months ago

Acne is a skin disease which is mainly caused by the bacteria Propionibacterium acnes. Clogging of skin pores by dead skin, hormonal changes and stress may also cause acne. Scars and pigmentation are the major symptoms of acne. Genetic cause may also lead to acne.

4Thank You

Aarya Sharma 4 years, 6 months ago

staphylococci

ANSWER

Answers

Posted by Jashwant Patel 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

꧁▪ ＲคᎥនТαʀ ࿐ 〖Sէudץ〗 4 years, 6 months ago

Ģœ

ᵐⁱˢˢ Lucid Dream 4 years, 6 months ago

Wʜᴀᴛ's ᴜʀ ǫᴜᴇsᴛɪᴏɴ?

ANSWER

Make a chemical formula of Aluminium Sulphate

Posted by Kartik Gameing 23 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Khushi Jain 4 years, 6 months ago

Aluminium Sulphate Al (So4) +3 -2 Al2(So4)3

ANSWER

What is electronic confrigation of iron

Posted by Kartik Gameing 23 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Vishal Singh 4 years, 6 months ago

The atomic no. of iron is 26 so, the electronic configuration of iron is: K=2 L=8 M=8 N=8

3Thank You

ANSWER

List any five difference between cation and atom .

Posted by Shivani Jha 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Sarvesh Kale 4 years, 6 months ago

Basis Anions Cations Definition An anion may be defined as an atom or molecule that is negatively charged. A cation may be defined as an atom or molecule that is positively charged. Charge Type Negative Positive Type of Element Non-Metal Metal Type of Electrode used Anode Cathode Examples Sulfide, Oxide, Fluoride, Chloride Iron, Lead, Sodium

ANSWER

A 0.24 sample of compound oxygen and boron was found by analysis to contain 0.096 g of boron and 0.144 g of oxygen.calculate the persentage composition of the compound by weight

Posted by Sarthak Verma 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Shafat Hasan 4 years, 6 months ago

Divide 0•24/0•96 and multiply it by ? and same for 0•144

ANSWER

What is mass precentage of solution

Posted by Piyush Negi 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Ujjwal Tiwari 4 years, 6 months ago

Mass/solution×100

ANSWER

What is epithelial tissue?

Posted by Bhawna Goswami 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Diya Bj 4 years, 6 months ago

epithelial tissues are protective tissues in animal body with no intercellular spaces.

Satyaki Yadav 4 years, 6 months ago

• Epithelial tissue is an covering tissue of our body. • it makes a border between organs to seperate them. • it protects underlying cells from injury, drying and chemicals. • it eliminates waste products such as oil and sweat.

Vishal Singh 4 years, 6 months ago

The covering or protective outer tissue is known as epithelial tissue.

ANSWER

An astronaut has 80kg mass on earth(a)what is his weight on earth ?(b)what will be his mass and weight on Mars where g=3.7m/s^2

Posted by Harshpreet Kaur 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Arun Chouhan 4 years, 6 months ago

(a) solve- weight =mass×acceleration due to gravity Weight=80kg × 9.8m/s^2 =784kg m/s^2 =784 N

3Thank You

ANSWER

What is cell organelles?

Posted by Aman Pandey 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

Nithya Sri 4 years, 6 months ago

Cell organells are the organells that helps the cell to perform various functions of the cell ER,vacuoles , mitochondria ,...and aome others are the examples

Satyaki Yadav 4 years, 6 months ago

Cell organelles are major components of the cell, which help the cell to continue it's life process.

Priyal Gupta 4 years, 6 months ago

Cell organelles are the substances found in the cell.

ANSWER

What is resources

Posted by Deepak Rana 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Ananya Singh 4 years, 6 months ago

Resource refers to the anything that can be used to fulfill our needs

Aarya Sharma 4 years, 6 months ago

Anything that is used to satisfy our needs is a resource.

ANSWER

Ways to reduce HIV

Posted by Pragya Verma 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

आदित्य कुमार झा 4 years, 6 months ago

Like me and u

आदित्य कुमार झा 4 years, 6 months ago

Use condoms ?

Urvi Chatter 4 years, 6 months ago

Taking preventive measures like 1.usking a new needle every time 2.having only one partner(sexually) 3.using a new condom

ANSWER

convert the following temperature to celcius scale

Posted by Dheeraj Mk Gowda 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Ankush Kumar Mahto 4 years, 6 months ago

1Celcies=270Kelvien Convert Celcies into kelvien Celcius+273=kelvien Convert kelvien into celcius Kelvin-273=celcius

ANSWER

Question.1. Define atomic number. How it is denoted ?

Posted by Jaya Chaudhary 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Student 10Th 4 years, 6 months ago

The atomic number or proton number (symbol Z) of a chemical element is the number of protons found in the nucleus of every atom of that element. The atomic number uniquely identifies a chemical element. ... The sum of the atomic number Z and the number of neutrons N gives the mass number A of an atom.

ANSWER

What is the sum of the angles at a point?

Posted by Neel Kanani 4 years, 6 months ago

CBSE > Class 09 > Science

2 answers

Yashi .... 4 years, 6 months ago

360 degrees

Sara Ali 4 years, 6 months ago

360°

ANSWER

What is DNA consist of?

Posted by Aayush Singh@8 4 years, 6 months ago

CBSE > Class 09 > Science

3 answers

आदित्य कुमार झा 4 years, 6 months ago

Vansh saxena learn from roy

Roy Roy 4 years, 6 months ago

DNA consists of genetic material ,like deoxyribonucleic acid as well as chromosomes

Vansh Saxena 4 years, 6 months ago

Dadies nazaij aulad (DND)

ANSWER

Our environment physical resources-air ,water and soil pollution

Posted by Sadan Zehan 4 years, 6 months ago

CBSE > Class 09 > Science

1 answers

Jaya Chaudhary 4 years, 6 months ago

Water, air, and soil are three natural resources that we cannot live without. The Forest Service strives to protect, maintain, and restore these valuable assets now and into the future. Water is one of the most important natural resources flowing from forests. The Forest Service manages the largest single source of water in U.S., with about one-fifth originating from 193 million acres of land which provides drinking water to 180 million people every day. Soil provides nutrients, water, oxygen and heat to natural land areas. Understanding the ability and capacity of soil to support an ecosystem plays an important role in land management decisions. Air is a third critical resource for humans, plants, animals and all other organisms within a natural area. Air must be monitored in order to control and lower pollution levels, control smoke caused by wildland fires, and to monitor air quality. The Forest Service monitors the effects of air pollution that may impair visibility, harm human health, injure trees and other plants, acidify or cause unnatural fertilization of streams and lakes, leach nutrients from soils, and degrade cultural resources, like archeological sites and historical buildings. Forest activities that can affect air quality such as prescribed burning, ski areas, and mining are also monitored to ensure compliance with air regulations for human health and to monitor possible impacts to natural resources.