True or false: animals use photosynthesis to make food

Answer:

Mendeleev’s periodic table is, based on the relation of elements’ properties as dependent on the atomic weight of the element. But the Modern periodic table considers atomic number as the fundamental property that decides the properties of elements.

The modern periodic table does correct the defects of Mendeleev’s periodic table. For example, in Mendeleev’s periodic table, in the element pairs, Argon-potassium, cobalt-nickel, tellurium-iodine and thorium and protactinium, elements with higher atomic mass precede the element with lower atomic weight. However, it is the right places for them but is against Mendeleev’s periodic law.

These elements atomic number shows the reverse order compared to atomic mass. The supposed to be wrong positions in Mendeleev’s table has the right explanation justifying their positions.

Answer:

C₂H₄-CH₄-CH₂O-SO₂-Cl₂

Explanation:

The arrangement of gases in increasing order of the number of atoms that make up its molecule, from left to right, is C₂H₄-CH₄-CH₂O-SO₂-Cl₂.

Gas is one of the matters. It's invisible, and its particles are present very far away from each other. The atoms of the gas move randomly, and they are always in motion.

There are iii kinds of matter, solid, liquid, and gas. When there is a modification in temperature when there is a rise in temperature the solid becomes liquid and eventually, the liquid becomes gas.

The arrangement of gases in it increases the order of the number of atoms. So it can be identified by seeing the moles of elements that are shown in the chemical formula of gas.

Thus, the arrangement of gases is C₂H₄-CH₄-CH₂O-SO₂-Cl₂.

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Explanation:

There are government khatris as well, which are maintained by the panchayat. Kuhls are a traditional irrigation system in Himachal Pradesh- surface channels diverting water from natural flowing streams (khuds). A typical community kuhl services six to 30 farmers, irrigating an area of about 20 ha.

Answer:

a.HF

b.co

c.oH

d.pcl

e.NH

f.po

g.CN

a) Among HF or HCl the more polar bond is HF. b) Among NO or CO, the more polar bond is CO. c) Among SH or OH, the more polar bond is OH. d) Among PCl or SCl, the more polar bond is PCl. e) Among CH or NH, the more polar bond is NH. f) Among SO or PO, the more polar bond is SO. g) Among CN or NN, the more polar bond is CN.

To determine the more polar bond in each pair, we need to consider the electronegativity difference between the bonded atoms. The greater the electronegativity difference, the more polar the bond. Electronegativity is a measure of an atom's tendency to attract electrons towards itself in a chemical bond.

The electronegativity values (Pauling scale) for the elements involved in the bonds are:

H = 2.20

F = 3.98

Cl = 3.16

N = 3.04

O = 3.44

S = 2.58

P = 2.19

C = 2.55

a. HF or HCl

HF: Electronegativity difference = 3.98 - 2.20 = 1.78

HCl: Electronegativity difference = 3.16 - 2.20 = 0.96

The more polar bond is HF.

b. NO or CO

NO: Electronegativity difference = 3.04 - 2.55 = 0.49

CO: Electronegativity difference = 3.44 - 2.55 = 0.89

The more polar bond is CO.

c. SH or OH

SH: Electronegativity difference = 2.58 - 2.20 = 0.38

OH: Electronegativity difference = 3.44 - 2.20 = 1.24

The more polar bond is OH.

d. PCl or SCl

PCl: Electronegativity difference = 3.16 - 2.19 = 0.97

SCl: Electronegativity difference = 3.16 - 2.58 = 0.58

The more polar bond is PCl.

e. CH or NH

CH: Electronegativity difference = 2.55 - 2.20 = 0.35

NH: Electronegativity difference = 3.04 - 2.55 = 0.49

The more polar bond is NH.

f. SO or PO

SO: Electronegativity difference = 2.58 - 3.44 = -0.86

PO: Electronegativity difference = 2.19 - 3.44 = -1.25

The more polar bond is SO.

g. CN or NN

CN: Electronegativity difference = 3.44 - 2.55 = 0.89

NN: Electronegativity difference = 3.04 - 3.04 = 0

The more polar bond is CN.

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Answer:

Chemical Change

Explanation:

It is a chemical change because milk is a substance and if it changes its molecular structure ,so it is a chemical change.

Answer:

Answer: a, b, c, d, e, f. a) 1 significant figure b) 3 significant figures c) 2 significant figures d) 4 significant figures e) 5 significant figures f) 6 significant figures Note that non-integers are rounded to the nearest integer and then count as the number of significant figures. For example, rounding 1.5 to two significant figures would mean one significant figure because it is an integer, not because it is a decimal.

Answer explanation: 26.000 cm = 2.6 x 10^2 cm. 0.800 km = 8 x 10^-3 km. 0.00050 g = 5 x 10^-4 g. 7300 m = 7.3 x 10^2 m. 3 x 10^5 mL = 3000000 ml or 300 L

Explanation:

How many significant figures are in each of these measurements?

32.14 cm

4.34 x 10^3 cm

2 g

13000 L

1.007 g/mL

6 mL

0.000005 L

2.7 mL

Answer: a, b and c contain 7 significant figures and the others each have 4 significant figures.

Incorrect answers indicate incorrect choices made for this problem or other problems on the worksheet . Answer explanation: 32.14 cm = 3.214 x 10^2cm 4.34 x 10^3cm = 4.34x10^5 cm 2 g = 2 grams 13000 L = 13 kiloliters 1.

The correct answer to the question is option C. Helium atoms have 2 valence electrons, while atoms of the other elements in the group all have 8 valence electrons.

Group 18 of the periodic table are known as the noble gas family. Their outermost shell is completely filled.

Members of the group 18 includes:

1. Helium (He)

2. Neon (Ne)

3. Argon (Ar)

4. Krypton (Kr)

5. Xenon (Xe)

6. Radon (Rn)

Among this group, only Helium (He) has a valence electron of 2.  Other members of the group has a valence electron of 8.

Helium is part of the group 18 because its outermost shell is completely filled by its 2 electrons.

Therefore, option C gives the right answer to the question as helium only have 2 valence electrons while other members of the group has 8 valence electrons.

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Frequencies of light that fall below the frequency threshold if the metal do not eject electrons.

Answer:

1 = 252g, 2 = 2mL, 3 = 1.5mL, 4 = 3g, 5 = 225g, 6 = 0.92g/mL, 7 = 0.75g/mL, 8 = 0.71g/mL, 9 = 1.9mL, 10= 1.11mL, 11 = 76.9g

Explanation:

This problem is testing how well you can move around the equation D = m/v where D = Density (g/mL), m= mass of sample (g), v = volume of sample (mL).

Answer:

there's no attachment

Explanation:

.

Answer:

6 mL = Smallest

600 cL = Middlest

60L = Greater

Answer:

Products are copper and magnesium sulphate

Explanation:

[tex]{ \bf{A+B→C+D}}[/tex]

A and B are reactants

C and D are products

Answer and Explanation:: Astronomy is the study space and what it contains. Astronomy should be studied by mankind because our survival is directly linked to the cosmos.  The Earth is heated by its nearest star, the Sun, and its ocean tides are directly connected to its only satellite, the Moon.  

Answer:

Astronomy is the study of stars and planets. It is important to humans because it helps us know if there is a supernova close to earth and more imformation about stars and planets that we need to know.

Answer: Gas pressure is employed in a variety of industrial operations, and it was the catalyst for the industrial revolution. Many industrial machines were powered by steam in the early twentieth century. To heat the water molecules inside massive boilers, wood was burned.

We know that the sunscreen preparation contains a 2.7% by mass of Benzyl Salicylate. From this, we will find that they need 1.559 kg of Benzyl Salicylate to make 340 tubes of sunscreen.

The initial data means that if the total mass of sunscreen is M, then the mass of Benzyl Salicylate will be 2.7% of M, or:

(2.7%/100%)*M = 0.027*M

Now, we know that a tube contains 6.0 oz of sunscreen.

Then M = 6.0oz

A tube contains:

0.027*6.0oz = 0.162 oz.

Then in 340 tubes, we will need 340 times 0.162 oz of Benzyl Salicylate, this is:

340* 0.162 oz = 55.08oz

And we want this quantity in kg.

Knowing that:

1oz = 0.028kg

Then 55.08oz is 55.08 times 0.028kg:

55.08*0.028kg = 1.559 kg

So they will need  1.559 kg of Benzyl Salicylate to make 340 tubes of sunscreen.

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Answer:

The process that converts a solid mcompound into a gas is sublimation.

E.g- dry ice, solid iodine and ammonium salts

when the above solid are heated, only particles which are found on the surface of the solid gain enough energy and break all forces of attraction and form a gas.

Explanation:

Answer:

Option 1 Data

Answer:

data

Explanation:

that is the answer

please 5 stars

Answer:

Your answer is in the attachment. Hope this helps you. Stay blessed.

Answer:

is there supposed to be a photo with this?

Explanation:

Lets Form bonds

Al=2,8,3

Lets Write actual configuration or modern

[tex]\\ \sf\longmapsto 1s^22s^22p^63s^3[/tex]

Let's write configuration

[tex]\\ \sf\longmapsto 1s^22s^22p^63s^23p^5[/tex]

Now Criss cross valency (Refer to attachment)

We get

[tex]\\ \sf\longmapsto AlCl_3[/tex]

Answer:

save my photo

who knows you might like it :>

Answer:

A bottle that is sealed would have the highest concentration.

Explanation:

When you put a gas into a container, the concentration or the amount of mol inside the bottle would be highly concentrated. If you open the bottle, the CO2 would spread outwards and leave the bottle giving more room between each molecule. The longer you open the bottle, the less concentrated the gas will be.

Answer:

climate change, dead zones, genetic engineering, pollutants, deforestation, soil degradation, waste, Over irrigation, salt buildup in soils, monoculture

Explanation:

Hopefully this'll help you!

We have that this how they differ

Physical properties

Chemical Properties

From the Question we are told that

Silicon properties:

a. blue-gray color

b. brittle

c. doesn't dissolve in water

d. melts at 1410°C

e. reacts vigorously with fluorine

Physical properties

This Refer to Properties that can be seen and  Measured

While

Chemical Properties

This are Refers to the effect of the element in reactions

Therefore

Physical properties

Chemical Properties

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The elements can also be classified into the main-group elements (or representative elements) in the columns labeled 1, 2, and 13–18; the transition metals in the columns labeled 3–12; and inner transition metals in the two rows at the bottom of the table (the top-row elements are called lanthanides and the bottom-row ...

Hello,

Elements are a group of the Periodic Table that shares common valence electron structures. They are arranged in order of increasing Atomic Number.

In modern periodic table they are classified into three parts- metals, non-metals and metalloids.

In detail:-

• Metals- Metals are those elements which donate electrons. Ex- Na, K, Rb, Mg, Ca, etc.

• Non-metals- Non-metals are those elements which accept electrons. Ex- N, O, F, Cl, etc .

• Metalloids- Metalloids are those elements which show property of both metals and non-metals. Ex- B, Si, Ge, etc.

Hope it helps...

(by Benjemin)

Acrylonitrile  and ethyl acetate can not be separated by simple distillation since they have the same boiling point.

Distillation is a separation technique in chemistry which can be applied only when the substances to be separated have different boiling points. The method relies on the difference between the boiling points of the components of a mixture in order to achieve separation.

Whereby Acrylonitrile and ethyl acetate have the same boiling point: 77.2°C, separation by distillation becomes impossible because the two substances are collected together.

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Answer:

definitely A

because proton is +1