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Sayoni Debnath 7 years, 1 month ago

Hydrogen has its atomic number 1 and its valence cell contains 1 electron which always tries to be stable by either gaining or loosing 1 electron. When it loses 1 electron it becomes H^+ and when it gains 1 electron it attains the stability of He by getting a duplet configuration.

Sinha Rk 7 years, 1 month ago

Because it has atomic number 1 and its valence shell contains one electon which always tries to make itself stable by gaining on more electron in its outermost shell . It's also said that it gets stable by octet.

ANSWER

Fungi are known to be hatmful for human beings but helpful for nature, justify

Posted by Yuvraj Singh 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is the formula taking out average atomic mass of an isotope

Posted by Arjun Rathore 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Chidambaram Rathna 7 years, 1 month ago

To find the percentage of each isotopes and add there average. For example; Chlorine occurs in nature in two isotopic forms, with masses 35 u and 37 u in the ratio of 3:1. The mass of an atom of any natural element is take as the average mass of all the naturally occuring atoms of that element. If an element has no isotopes, then the mass of it's atom would be the same as the sum of protons and neutrons in it . But if an element occurs in isotopic forms, then we have to know the percentage of each isotopic form and then the average mass is calculated. The average Atomic mass of chlorine atom, on the basis of above data , will be [(35×75÷100+37×25÷100)=(105÷4+37÷4)=142÷4=35.5u]. It means that if you take a certain amount of Chlorine, it will contain both isotopes of Chlorine and the average mass is 35.5 u.

ANSWER

Where goblet cell present

Posted by Sanjeev Kumar Gupta 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is a sonar

Posted by Ankit Birodalai 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sakshi Vishnoi 7 years, 1 month ago

SONAR-Sound Navigation And Ranging.It is used to detect hidden Ships,valleys etc.?

3Thank You

ANSWER

what is definition of commercial unit of electrical energy

Posted by Atul Kuwar 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

Kilowatt - hour is the commercial unit of electrical energy. We have seen that power is the rate of energy consumed or delivered. ... It is (1000 watt) x (3600 seconds) i.e., 3600000 joules = 3.6x106 J. 3.6 x 106 J is defined as 1 kWh. The electric energy used in houses, factories etc. is measured in kilowatt hour.

ANSWER

What is antibiotic ?who discover antibiotic name of first antibiotic and source of antibiotic

Posted by Govind Singh Rajput 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Shekhar Pandey 7 years, 1 month ago

Pencilinium was the first antibiotic

Sakshi Vishnoi 7 years, 1 month ago

Alexander Flaming discovered first antibiotioc .?

Ankit Birodalai 7 years, 1 month ago

Antibiotics is a medicine which kill s or stop the growth of disease causing micro organisation

ANSWER

drive the graphically equation for postion tham relation for and object travelling a distance s time t under uniform accleration

Posted by Pankaj Kag 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Paras Sharma 7 years, 1 month ago

Hey gaurav how can you send answers with a picture. Tell me please.

Gaurav Seth 7 years, 1 month ago

Let a body moves from D to with initial speed u and are moving with uniform acceleration finally body reach point B after time taken t.

distance travelled by body = area between curve v-t
= area DBA + area DAEO
= 1/2 × base × height + length × Breadth
= 1/2 × t × (v - u) + ut

we know , ( v - u ) = at, put it above

= 1/2× t × at + ut
= ut + at²/2

hence , distance travelled by body = ut + 1/2at²

ANSWER

What are the difference between the mass of an object and its weight

Posted by Jiya Jonwal 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

Difference between mass and weight-:

• Mass is the total matter contained in a body while weight is the force with which an object is attracted towards the earth.

•SI unit of mass and weight are different.

SI unit of mass - Kg (Kilogrammes)
SI unit of weight - N (Newton)

• Mass is constant, it won't change due to position. While weight isn't constant, it will change due to position. Suppose, the object is
taken at the center of the earth where gravity is 0, we know that,

W=mg
W= m×0
W=0

Weight will change due to change in position.

• Mass can never be zero, while weight can be.

• Mass is a scalar quantity , having only a magnitude and no role of direction.

• Weight is a vector quantity having a magnitude as well as a direction on its own.

• Mass is most probably measured by use of a beam balance while weight is measured by use of a spring balance usually.

ANSWER

What is the difference between density and relative density explain properly

Posted by Gaming World 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Gaurav Seth 7 years, 1 month ago

Density	(Specific Gravity) Relative density
i. Mass per unit volume of a substance is called density. ii. Density = mass/volume iii. SI unit of density is Kg/m³ CGS unit of density is g/cm³	i. The ratio between density of a substance and density of water is called relative density. ii. Relative density = Density of the substance/density of water at 4⁰C iii. Units: Relative density has no units because it is the ratio between the similar physical quantities (density).

ANSWER

V²-u²=2as prove by graphically

Posted by Nikunj Jain 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Gaming World 7 years, 1 month ago

We have, v = u + at. Hence, we can write t = (v-u)/a Also, we know that, Distance = average velocity × Time Therefore, for constant acceleration we can write: Average velocity = (final velocity + initial velocty)/2 = (v+u)/2 Hence, Distance (s) = [(v+u)/2] × [(v-u)/a] or s = (v² – u²)/2a or 2as = v² – u² or v² = u² + 2as

Gaming World 7 years, 1 month ago

According to graph distance covered =area of trapizium oabc=1/2(BC+OA)×AD =1/2(V-U)×T

Gaming World 7 years, 1 month ago

1st of all you have written wrong equation is this v2=u2+2as now

ANSWER

What is the valency of k potassium

Posted by Rahul Ostwal 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Sakshi Vishnoi 7 years, 1 month ago

yes

Prachi Janwani 7 years, 1 month ago

The vacancy of potassium is. -1

Reema Pandey 7 years, 1 month ago

The valency of k potassium is - 1

3Thank You

ANSWER

Bone cell

Posted by Ritik Vats 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Sk Kumar 7 years, 1 month ago

Oestocyte

ANSWER

How leguminous crop improved fertility of soil

Posted by Shanu Kumar 6 years, 9 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 6 years, 9 months ago

The leguminous plant expands the soil ripeness due to the Rhizobium bacteria in the root knobs of the plants.

ANSWER

Difference between monocot and dicot plant???????????????????????????

Posted by Neha Panwar 7 years, 1 month ago

CBSE > Class 09 > Science

3 answers

Anshuman Kumar 7 years, 1 month ago

Monocot: It has only one cotyledon. It is trimerous. It has fibrous root. It has parallel veins on the leaves. Dicot: It has two cotyledons. It is pentamerous. It has tap root. It has reticulated veins on the leaves.

Rahul Ostwal 7 years, 1 month ago

Monocots -1posses one cotylendon 2 fibours roots and parallel venation 3 trimerous flower Dicots-1 posses two cotylendons 2 tap roots 3 reticular venation 4 pentamerous flower

Neha Panwar 7 years, 1 month ago

It's very important for me?

ANSWER

Why boiling is a bulk phenomenon???

Posted by Kartik Dhanai 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Khushi Shahi 7 years, 1 month ago

Boiling is a bulk phenomenon as the particles from the bulk of the liquid gain enough energy to change into the vapour state.

ANSWER

Describe activity to show that ink is a mixture of dye in water

Posted by Bhumi Kushwah 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Meghna Thapar 6 years, 1 month ago

Activity: To demonstrate the process of evaporation.

Aim: To obtain coloured component (dye) from blue/black ink.

Materials:

Beaker
Water
Watch glass
Blue/black ink

Procedure:

Fill half a beaker with water.
Put a watch glass on the mouth of the beaker.
Put few drops of ink on the watch glass.
Now start heating the beaker. Continue heating as the evaporation goes on and stop heating when there is further change on the watch glass.

Observations:

We can see that the evaporation is taking place from the watch glass. Dye is left on the watch glass.

Conclusions:

Ink is a mixture of a dye in water. Thus, we can separate the volatile component (solvent) from its non-volatile solute by the method of evaporation.

ANSWER

One element has atom with 15 electrons a) Draw a diagram to show the electron distribution b) Write the electronic configuration in its - 3 Ion state c) Name the element

Posted by Vaishnavi P 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

An element X has a valency of 2 .Write the formula of its oxide

Posted by Vaishnavi P 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Khushi Shahi 7 years, 1 month ago

ANSWER

What is binary compounds?

Posted by Basuvaraj Mariyappan 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Neha Panwar 7 years, 1 month ago

I think ? yogita ingle is too intelligent.

Yogita Ingle 7 years, 1 month ago

Binary compounds are chemical compounds comprising of two distinct elements. An element is a substance that cannot be further divided into any simpler substances using chemical methods. Hence sodium fluoride, magnesium oxide, and calcium chloride are all chemical elements. So it implies that binary compounds comprise of exactly two different chemical elements.

Examples of Binary Compounds: There are binary compounds which consist of more than one of each element. For example water, it comprises of two hydrogen atoms and one oxygen atom (H₂O). Water and calcium chloride are also examples of binary compounds that one can see in their daily life.

ANSWER

Onion peel experiment

Posted by Nikhil Dubey 7 years, 1 month ago

CBSE > Class 09 > Science

0 answers

ANSWER

What is 1N

Posted by Yaah Veer 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Vaidehi Kumari ??? 7 years, 1 month ago

When a body of 1kilogram accelerates 1m/sec square is 1N

Basuvaraj Mariyappan 7 years, 1 month ago

Unit of force

ANSWER

Difference between charging by conduction and charging by induction

Posted by Robanpreet Kaur 4 years, 9 months ago

CBSE > Class 09 > Science

1 answers

Sia ? 4 years, 9 months ago

The major difference between conduction and induction is that conduction allows the charging of a neutral body with a charged body by forming a direct contact with it. While induction is the process of charging a neutral body by a charged body without making any direct contact.

ANSWER

What is the maiter

Posted by Anoop Kumar 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

Everything in this universe is made up of material which scientists have named as "matter". There are three states of matter - solid, liquid and gaseous. The states of matter are inter-convertible and can be converted by changing the temperature or pressure.

3Thank You

ANSWER

Differentiate between smooth,cardiac,unstraited muscles

Posted by Jagmal Rathore 7 years, 1 month ago

CBSE > Class 09 > Science

1 answers

Yogita Ingle 7 years, 1 month ago

Unstriated muscle	Cardiac muscle
They spindle shaped and uninucleate.	They are cylindrical branched and uninucleate.
They are present in the wall of food canal, stomach, mouth, iris etc.	They are present in the heart.

ANSWER

Where the protein synthesis in cell

Posted by Vishal Arora 7 years, 1 month ago

CBSE > Class 09 > Science

2 answers

Anchal Mishra 7 years, 1 month ago

RER by ribosomes

Yogita Ingle 7 years, 1 month ago

The nucleus is the site of ribosomal RNA (rRNA) synthesis, which is important for the construction of ribosomes. Ribosomes are the site of protein translation (synthesis of proteins from amino acids).