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Answer:

Ductility is a measure of a material's ability to undergo significant plastic deformation before RUPTURE or breaking, which may be expressed as PERCENT ELONGATION or percent area reduction from a tensile test. According to Shigley's Mechanical Engineering DESIGN significant DENOTES about 5.0 percent elongation.

ANSWER:

all of these is the answer

A colorless liquid. DENSITY 1.22 g / cm3 at its boiling point of -89°C. BOILS to give a colorless gas that is sweet-smelling and moderately toxic. The gas has NARCOTIC effects when INHALED (laughing gas).

Universal adult FRANCHISE MEANS that every person above the age of 18 has the RIGHT to VOTE.

It is important to democracy because it is based on the PRINCIPLE of equality as it does not discriminate on the basis of social or economic backgrounds. Under UAF, every adult irrespective of caste, creed, religion, sex etc. has the right to vote.

Chapter 1: THE NATURE OF SCIENCE

Over the course of HUMAN history, people have developed many interconnected and validated ideas about the PHYSICAL, biological, psychological, and social worlds. Those ideas have enabled successive generations to achieve an increasingly comprehensive and reliable understanding of the human species and its environment. The means used to develop these ideas are particular ways of observing, thinking, experimenting, and validating. These ways represent a fundamental aspect of the nature of science and reflect how science tends to differ from other modes of knowing.

It is the union of science, mathematics, and technology that forms the scientific endeavor and that makes it so successful. Although each of these human enterprises has a character and history of its own, each is dependent on and reinforces the others. Accordingly, the first three chapters of recommendations DRAW portraits of science, mathematics, and technology that emphasize their roles in the scientific endeavor and reveal some of the similarities and connections among them.

This chapter lays out recommendations for what knowledge of the WAY science works is requisite for scientific literacy. The chapter focuses on three principal subjects: the scientific world view, scientific methods of inquiry, and the nature of the scientific ENTERPRISE. Chapters 2 and 3 consider ways in which mathematics and technology differ from science in general. Chapters 4 through 9 present views of the world as depicted by current science; Chapter 10, Historical Perspectives, covers key episodes in the development of science; and Chapter 11, Common Themes, pulls together ideas that cut across all these views of the world.

Answer:

A homogeneous mixture has the same uniform APPEARANCE and composition throughout. Many homogeneous mixtures are commonly referred to as solutions. A heterogeneous mixture consists of visibly DIFFERENT substances or PHASES. The THREE phases or states of matter are gas, liquid, and solid.

ANSWER:

go to KEYBOARD THEME and select colour and then APPLY

Answer:

a.. potassium chloride

b.. sodium oxide

c..k2O2

d..LiC1

Explanation:

a..when potassium reacts with chlorine there is anew formanation that is potassium chloride...

b..when sodium react with oxygen there is a new formanation that is sodium oxide

c.. when potassium reacts with oxygen there is a new formanation that is K2O2.

d.. when lithium reacts with CHORINE there is a new formanation that is LiC1

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ANSWER:

the DIRECTION of MOTION of the OBJECT

No,we cannot use carbon to MAKE WIRES for household usage.

Because,

• We use wires in our households to conduct electricity through the whole WIRING system. So,we obviously need a good conductor of electricity to make the wires.

• Now,most of the allotropes of the carbon are poor conductors of electricity. (Exception : graphite.)

• Graphite form of carbon,can conduct electricity but it has less amount of physical strength than any other metal. That's why wires made out of graphite will be very FRAGILE and it's not DESIRABLE at all.

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Answer:

5

Explanation:

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Answer:

Filtration is a separation process in which a mixture is passed through a filter that allows one component to pass through uninhibited but blocks another component from passing through.

In general this method sorts by size, with the filter acting as a barrier that allows smaller particles to GO through but keeps larger particles back.

Think of a colander separating spaghetti from water or a coffee filter holding back coffee grounds while water passes through.

order to sort these mixtures, the components must be noticeably different in size/composition. Therefore the mixture must be heterogeneous.

Another example would be an air filter which helps to remove solids like dust or pollen in HCAC systems to give better air quality inside of your home.

A laboratory example

You can produce solid calcium carbonate (chalk) by combining aqueous solutions of calcium chloride and SODIUM carbonate.

CaCl2(aq) + Na2CO3(aq) → CaCO3(s) + 2NaCl(aq)

The CaCO3

forms as a precipitate.

The mixture can be poured through a funnel with a filter paper inserted.

The

CaCO3

is TRAPPED by the paper, but the

NaCl

passes through the filter paper with the water.

The video below SHOWS how filtration can be used to separate calcium carbonate (chalk) from water.

What happens when clay or sand is mixed with water? Would you be able to see through a mixture of clay and water? The mixture of clay or sand with water is muddy. The small clay particles become suspended in the water. This kind of mixture is called a suspension. Suspensions are opaque; that means they are cloudy and we cannot see through them very well.

What happens when sugar is mixed with water? Does the mixture become muddy? Why not? The sugar dissolves in the water and the mixture is called a solution. Solutions are clear; that means we can see through them.

Milk is not a single substance, but actually a mixture of two liquids! The one liquid component in milk is water, and the other is fatty oil. The reason milk is opaque is that tiny droplets of the oil is suspended in the water. Can you remember what a mixture is called when a solid is suspended in liquid?

When some liquids are suspended in liquid, we call the mixture an emulsion. Like suspensions, emulsions tend to be opaque.

Many things around us occur naturally as mixtures: salty sea water, MOIST air, soil, compost, rocks (mixture of minerals) to name a few. Many mixtures are man made, for instance; Coca Cola, paint, salad dressing and so forth.

Mixtures are very useful. However, sometimes we need to separate mixtures into their components. Remember that the substances in a mixture have not combined chemically. They have not turned into new substances, but are still the same substances as before - they have just been physically combined. That is why we can use physical methods to separate them again.

Methods of physical separation

Now that we know about the different kinds of mixtures that are possible, we are going to learn about some ways of separating them.

How do we separate mixtures?

sieve

filtration

filtrate

magnetic

grain

residue

Suppose you were given a basket of apples and oranges. How would you sort them? You would probably pick out all the oranges from the apples by hand. The same method may not be suitable for all mixtures. You would probably not consider sorting sugar and sand grains by hand. Why not?

Let us look at some of the most commonly used methods of physical separation.

Hand sorting

Sieving

Can you think of a practical way to sort stones or pebbles from sand? Do you think picking the pebbles out by hand would work?

When we have large quantities of materials to sort and the different particles have different sizes, we can sieve the mixture. The smaller particles will fall through the openings in the sieve, while the larger particles stay behind.

Filtration

When the particles in a mixture are too small to be caught by a sieve and when the components of the mixture are in different states, we can separate them by filtration using a filter.

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Answer:

To prepare

(a) a mixture

(b) a compound using iron filings and sulphur powder and distinguish between these on the basis of:

appearance, i.e. HOMOGENEITY and heterogeneity

behaviour towards a management

behaviour towards carbon disulphide (a solvent)

effect of heat

MATERIALS REQUIRED

China dish, tripod stand, wire gauze, iron filings, sulphur burner, test tube stand and test tube holder.

THEORY

Formation of mixture is a physical change while formation of compound is a chemical change. Mixture may be homogeneous or heterogeneous while COMPOUNDS are always homogeneous. In a mixture, components retain their individual properties while the components of a compound lose their individual properties. The components of a mixture can be separated by physical methods while the components of compounds cannot be separated by physical methods.

PROCEDURE

Preparation of mixture of iron and sulphur:

Take 7 g iron filing and 4 g sulphur powder in a petri dish and mix them properly. Label this mixture as A.

Preparation of compound iron sulphide:

Take 7 g iron filing and 4 g sulphur in a china dish. Heat this mixture GENTLY and then strongly. Stir constantly till black mass or compound of iron and sulphur is formed.

Cool the content of china dish and powder the black mass. Label compound powder as B.

cbse-class-9-science-practical-skills-mixture-and-compound-1

RESULT

‘A’ is a mixture which is prepared by mixing iron filings and sulphur.

‘B’ is a compound which is formed by strongly heating a mixture of iron filings and sulphur. The chemical equation for this change is as follows:

cbse-class-9-science-practical-skills-mixture-and-compound-4

Mixture of iron filings and sulphur is heterogeneous while the compound iron sulphide is homogeneous.

Properties of FeS are different from the properties of its constituents.

PRECAUTIONS

Handle the chemicals carefully.

Do not bring CS2 NEAR the flame as it is highly inflammable.

Heating of mixture of iron filing and sulphur should be done in china dish.

Wash your hands properly with soap after the experiment.

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Frequency, in physics, the number of waves that pass a fixed point in unit time; also, the number of cycles or vibrations undergone during one unit of time by a body in periodic motion.

~It is denoted by F

S.I unit of frequency is hertz (Hz)

Hertz Is DEFINED as,

The number of hertz (abbreviated Hz) EQUALS the number of cycles per second.

Frequency is an important parameter used in science and engineering to SPECIFY the rate of oscillatory and vibratory PHENOMENA, such as mechanical vibrations, audio signals (sound), radio waves, and light.

____________________________________________________

Aluminium cooking utensils are safe. Probably. For most consumers the amount of aluminium absorbed into food from cooking utensils is unlikely to be harmful.

In recent years there has been concern about the possible role of aluminium in a number of neurological disorders.Scientists have found increased levels of aluminium in the brain tissues of some patients suffering from Alzheimer's disease, AMYOTROPHIC lateral sclerosis and Parkinsonism dementia. Although hypotheses have been put forward suggesting that aluminium may be an important factor in these disorders, so far, there is insufficient evidence to say that aluminium is a cause.

The amount of aluminium in our diet will depend on its concentration in the foods we select, the amounts of them we eat and their method of preparation. When foods are cooked or stored in aluminium containers some of the aluminium may dissolve and be absorbed into the food.

Acid foods such as fruit and vegetable juices, tomatoes and sauerkraut tend to increase in aluminium content more than other foods, but the extent of this depends on other factors such as cooking temperature, length of CONTACT time and even the amount of sugar present (sugar reduces the amount of aluminium that is dissolved). Generally however, the amount of aluminium consumed in this way is very small compared to that naturally present or that obtained from food additives.

Foods such as some herbs and spices and tea leaves are naturally high in aluminium but because only small quantities are generally consumed the amount of aluminium obtained from these ITEMS will not be high. If large amounts of these foods are consumed then the aluminium intake will be more substantial.

Food additives which contain aluminium include the ANTICAKING agents calcium aluminium silicate (anticaking agent 556) and sodium aluminosilicate (anticaking agent 554) and the baking powder ingredient, sodium aluminium phosphate (541). Baking powders can be used in a wide range of products such as self-raising flour, biscuits, cakes and other flour products. When baking powder is used in these products, the sodium aluminium phosphate in the powder does not have to be declared separately on the label. Some forms of synthetic colouring substances may add some aluminium to our diet. The presence of the aluminium in these colours does not have to be declared on food labels.

Overall, the amount of aluminium in food, whether naturally occurring or in the form of food additives, is likely to be low compared to the amounts that can be obtained from consuming pharmaceutical products such as antacids, BUFFERED analgesics and anti-diarrheoals.

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❒ According to question,

• Chalk powder + Water is a Suspension.

[SINCE, Chalk powder is insoluble in water, it is a heterogeneous mixture. They spread throughout the LIQUID, but after sometime they tend to settle at the bottom. Due, to this the above mixture is a Suspension.]

❒ EXPLANATION:

Since, we are GIVEN three mixtures of some components with water, we have to judge whether they are suspension/colloid/solution. Based on observations, here are results.

• Chalk Powder + Water (Suspension)

As already explained, Chalk is insoluble in water. They create a suspension of fine chalk particles in water. After sometime, they settle at the bottom. Also, the particles can be seen with naked eyes.

• MILK + Water (Colloid)

It is a colloid since, the particles do not settle at the bottom. Also, the particles are very small to see with naked eyes. They scatters light, and the path of light is visible.

• Glucose + Water (Solution)

It is a Solution, because Glucose is soluble in water. It forms a homogenous mixture. The size of particles is extremely small. The particles could pass through filter paper. The particles do not separate on keeping undisturbed. It doesn't scatter light

❒ Explore more!

1. Solution is homogenous, but colloid and solution are heterogeneous in nature.
2. Range of particles size: Solution(< 10‐⁹ m), Colloid(between 10-⁶ m and 10-⁹ m) and Suspension (> 10‐⁶ m)
3. Particles of Colloid and Suspension scatters light, and the light is visible(Tyndall effect), whereas light is not visible through Solution.
4. Solution and Colloid are stable in nature. But, Suspension is unstable. That's why, Particles do not settle at the bottom in Solution and Colloid.

━━━━━━━━━━━━━━━━━━━━

ANSWER:

so2

Explanation:

Answer:

the jelly LIKE SUBSTANCE in CELL is call you cytoplasm. in which all ORGANELLES are floating.

ANSWER:

Water has both the effects when cooled it has latent HEAT of FUSION but when heated it has latent heat of vapourisation

Explanation:

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ANSWER:

a) 2 ELECTRONS...

B) 2nd GROUP...

Answer:

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Answer:

jaldi LINA WHP PE aao I am waiting

ANSWER:

I don't KNOW what is the answer

Answer:

Certain elements COMBINE with other atoms, donating, accepting or sharing electrons in different proportions depending on the nature of the reaction. For example, IRON COMBINES with oxygen to form ferrous oxide as WELL as ferric oxide. This is termed variable valency.

1. KMno4
2. Product
3. H2
4. Gas
5. liberated

ANSWER:

how are you i HOPE you are FINE

Answer:

1) true

2) false

3)false

4) true

5) true

6) true

7)false

Explanation:

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ANSWER:

HEY its answer

Explanation:

i HOPE its GOOD

ANSWER:

NEURON cells are long and branched.

Explanation:

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Answer:

petroleum ROCKSALT plastic bronze GOLD marbles NYLON among these NUMBER of NATURAL compounds

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Answer:

The clear LIQUID above the sediment is called SUPERNATANT. ... This process of shifting clear liquid from the container without DISTURBING the sediment is called decantation.

ANSWER:

cellulose

Cell WALL is non-living, thick and freely PERMEABLE COVERING made up of cellulose.

Answer:

Common SALT is obtained from sea-WATER by the process of evaporation. Sea water is trapped in large, shallow POOLS and allowed to STAND there. The sun's heat evaporates the water slowly and common salt is LEFT behind.

By XxItzZalimGudiyaxX

Catalyst, in chemistry, any substance that increases the rate of a reaction without itself being consumed. Enzymes are naturally occurring CATALYSTS responsible for many essential biochemical reactions.

Most SOLID catalysts are METALS or the oxides, sulfides, and halides of metallic elements and of the semimetallic elements boron, ALUMINUM, and silicon. Gaseous and liquid catalysts are commonly USED in their pure form or in combination with suitable carriers or solvents; solid catalysts are commonly dispersed in other substances known as catalyst supports.

Answer:

SHELLS in Atom

Explanation:

VAISE Electrons REMAIN in orbitals. And PROBABILITY of finding an electron is EVERYWHERE.

Answer:

(c) B. Alauddin was murdered by MALIK Kafur. Short Answer Questions 1. Write a short note on the SOURCES of the Sultanate Period. TAX

ANSWER:

A COMPOUND CONSISTS of TWO or more elements combined together chemically.

ANSWER:

HEY its answer

Explanation:

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Answer:

In this science experiment, sugar and hot water are stirred together to FORM a solution. By varying the amount of sugar, the solution may become SATURATED or SUPERSATURATED. As the solution cools, CRYSTALS may form. ... In this case, sugar is our SOLID which is dissolved uniformly in a liquid, water.

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ANSWER:

IDK just for POINTS srry

Explanation:

Answer:

Those materials which cannot be easily COMPRESSED, cut, BENT or SCRATCHED are CALLED hard materials. Examples: IRON, glass. Those materials which can be easily compressed, cut, bent or scratched are called soft materials.

ANSWER:

a COMPOUND has a definite COMPOSITION

ANSWER:

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ANSWER:

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Answer:

Following are the limitations of a CHEMICAL equation:

(i) A chemical equation does not tell us the physical state of the reactants and the PRODUCTS in the REACTION.

(ii) It does not tell us the actual CONCENTRATION or dilution of the reactants used in the reaction.

(iii) It does not tell whether the reaction starts at its own or some heat is required to start the reaction.

(IV) It does not tell whether the reaction is violent in nature or not.

(v) The time taken by the reaction to complete itself is also not known.

ANSWER:

Sodium phosphate−Na

3

PO

4

Aluminium chloride−AlCl

3

Calcium oxide−CaO

Potassium nitrate−KNO

3

Ammonium hydroxide−NH

4

OH

Explanation:

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ANSWER:

A

sea WATER is MIXTURE of SALT and water

ANSWER:

ANTOINE Lavoisier

Explanation:

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Explanation:

by using LITMUS paper we can prove that TOMATO and orange contains ACID. magnesium hydroxide is BASIC in NATURE , it reduces acid