Each roman numeral represents a sample of a substance. Each circle represents an atom. Considering what qualifies as a pure substance, which image(s) would be considered pure substances?

III and V


V


II and IV


I and III

Answer:

Ultraviolet radiation is a form of electromagnetic radiation that comes from the sun.

Explanation:

One mole of NaOH weighs 40gm.

Now 2M solution of NaOH indicates 2 moles of NaOH in 1 litre of water.

So the above question can now be simplified as …if one litre of water contains 80gm(2 moles) of NaOH, then how many grams of NaOH would 250ml solution of the same contain?

Using unitary method,

1000ml corresponds to 80gm NaOH…

1000/4 ml(250ml) corresponds to 80/4 gm NaOH…

Therefore, for 250ml of 2M NaOH, 20 gm of NaOH needs to be added to water.

For a given gas

[tex]\boxed{\sf E\propto T}[/tex]

[tex]\\ \sf\longmapsto \dfrac{\epsilon_1}{\epsilon_2}=\dfrac{T_1}{T_2}[/tex]

Answer:

The outermost (valence) shell of argon has eight electrons, making it exceedingly stable and, thus, chemically inert. Argon atoms do not combine with one another; nor have they been observed to combine chemically with atoms of any other element.So argon is an inert gas

Answer:

because argon have 8 electrons in there outmost shell

which is enough to make it stable

Answer:

Sodium hydrogen sulphite

Explanation:

The white precipitate formed is because of the sulphite ion and a carbonyl group formed

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Answer:

Answer:

Well if it is revolve then 365 days if it is rotation then 24hrs. Hope this helps

Answer:

It Takes A Whole 24 Hours

Explanation:

about 365 days

Earth is closer to the sun and revolves around it in about 365 days

Answer:

A.

Explanation:

Answer:

A. 4

Explanation:

We know that Tommy purchased a 2 liter bottle, in which pours 500ml of said bottle in cups, following asked of how many cups would he need before finishing the soda.

First off, 1 liter is 1,000 millileters, therefore that dividing a two liter bottle (2000ml) by 500ml will give us our answer :

2000/500

A. 4

Answer:

answer of first question is Chlorine

answer of second question is Group 14

Answer:

When an element is oxidized, it loses electrons

Answer:

The last option is the correct answer.

Explanation:

When an element is oxidized, it loses electrons. But when an element is reduced, it gains electrons. This is the basis of redox reactions.

However, an oxidizing agent oxidizes something else, and gets reduced, therefore gaining electrons. Meanwhile, a reducing agent reduces something else, and gets oxidized in the process, losing its own electrons.

Answer:  60 g/mban

Explanation:  I don't know what an "mban" is, but the density of this alien rock would be 60 grams/mban.  Density = Mass/Volume

The unit that is equivalent to 75g is 0.075 kg, 750 dg, and 7.5 dag. The correct options are b, c, and d.

Measuring units are the units used to denote the measurement quantities. There are seven basic measuring units. They are length, Time, Amount of substance, Electric current, Temperature, Luminous intensity, and Mass.

The current unit is given grams, which are used to measure the mass of any object.

1000 grams is equal to 1 kilogram and 1 dg = 0.1 g, and 1 dag = 10 g. So by this formula, each of the quantities can be calculated.  

1 kg = 1000 g

So, 0.075 kg = (0.075 × 1000)g = 75 g

1 dg = 0.1 g

So, 750 dg = (750 × 0.1) g = 75 g

1 dag = 10 g

So, 7.5 dag = (7.5 × 10) g = 75 g

Thus, the correct options are b. 750 dg, c. 7.5 dag, and d. .075 Kg.

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Answer: 3 cm

Explanation:

Answer:

222.1

Explanation:

(14+4*1)*2+32.1+16*4+(2*1+16)*5=222.1

Answer:wo major scientific discoveries provide strong support for the Big Bang theory: • Hubble's discovery in the 1920s of a relationship between a galaxy's distance from Earth and its speed; and • the discovery in the 1960s of cosmic microwave background radiation.

Explanation:

Answer:

(a)572.2ml

(b)54000cm

Explanation:

(a) 1 l = 1000 ml

0.5722 l =?

=572.2 ml

(b) 1m = 100cm

540m=?

=54000cm

The various units like liter, meter, and kilogram are used to measure the objects and matter. 0.5722 L is equivalent to 572.2ml and 540.0 m is equivalent to 54000cm.

Unit of measurements are magnitudes used to estimate the quantity of the matter and includes seven fundamental units, including meter, kilogram, seconds, candela, mole, kelvin, and ampere.

The fundamental units can be used to define other measurements that are called derived units, like volume, density, etc. The unit can be converted into various metric systems.

Unit conversions are done as:

0.5722 L = X mL

X = (0.5722 L × 1000 mL) ÷ 1 L

= 572.2 mL

540 m = X cm

X = (540 m × 100 cm) ÷ 1 m

= 54000cm

Therefore, 0.5722 L = 572.2 mL, and 540.0 m = 54000 cm.

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Answer:juhygjdkeExplanation:

Mendelevium is named for Dmitri Mendeleev who produced one of the first periodic tables.

Abelson first found neptunium in 1940 after uranium had been bombarded by neutrons from the cyclotron at Berkeley, California. ... The element was named after the planet Neptune, which is the first planet beyond Uranus.

Answer in explanation

Explanation:

neptunium was named after the discovery of the planet neptune in september 23 1846

mendelevium was named as dimitri mendeleev

Answer:

5.029 × 100

Explanation:

Answer:

Answer:

a) MgCl2

b) CaO

c) Al2O3

2)A chemical equation is the symvolic representation of a chemical reactionary in the form of symbol and formulae, wherein the reactants entities are given on the left hand side and the product entities on the right hand side.

3) ammonia sulfate- NH4

carbonic acid- H2CO3

sodium bicarbonate- NaHCO3

sodium hydroxide- NaOH

nitric acid- HNO3

ethanol- C2H5OH

methane- CH4

sodium nitrate- NaNO3

aluminium oxide- Al2O3

citric acid- C6H8O7

I HOPE YOU WILL GIVE ME BRAINLIEST ❤️

Correct option : picture III and IV

The pictures lll and lV are depicting mixtures cuz they contain different kinds of atoms and molecules .

Picture III and IV shows the particles in the mixture. The correct option is D.

Thus, A mixture is a combination of two or more components that can be physically separated and are not chemically linked together.

Each component in a combination can exist in a variety of ratios while still maintaining its own characteristics. Mixtures fall into one of two categories: Homogenous and Heterogenous.

Homogeneous Mixtures: These mixtures, sometimes referred to as solutions, have a consistent composition throughout and make it challenging to identify the different components.

Thus, Picture III and IV shows the particles in the mixture. The correct option is D.

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Answer:

167.86 tonnes

Explanation:.

I am assuming the iron oxide is Fe2O3 (Haematite) which is the most common form of iron oxide.

From the atomic masses:

Maximum Mass of iron = 240 *  2*55.845 / (2*55.845 + 3*15.999))

= 240 * 111.69 / (159.687)

= 167.86 tonnes

Answer:

b

Explanation:

well I really don't remember but I think it's b

Answer:2

Explanation:

Explanation:

Force=mass *acceleration

F=300*5

f

F=1500N

Answer:

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