is water?
A. a substance made up of two different elements (hydrogen and oxygen)
B. an element

Answer:

Liquor

Explanation:

Answer:

1. Evaporation

2. Filtration

3. Distillation

4. Chromatography

Explanation:

[tex].[/tex]

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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Explanation:

1. neutrons

2. protons

3. protons and neutrons

4. neutrons

5. electrons

I'm not sure with 1 and 4, sorry :<

Answer: The sum of an atom's protons, neutrons, and electrons, with protons equal to 1 AMU each, and electrons are 0 AMU each.

Explanation: By convention, atomic mass of an element is calculated by adding the masses of it's protons, neutons, and electrons. By definition, protons and neutrons are assigned values of 1 "atomic mass unit," or AMU, each, and electons are so small that they are assigned a value of 0 AMU each. Thus, a carbon 12 isotope atom (6 protons, 6 neutrons, and 6 electrons) would have a total of (6+6+0 =) 12 AMU. Carbon-13 has an additional neutron, so it's mass is (6+7+0)= 13 AMU. Molecules are the sum of each of it's individual atoms.

What is an AMU in actual mass? The definition states that 1 AMU is 1/12 the mass of a sinlge Carbon 12 isotope. By defining it in this manner, independent laboratories can calibrate their own instruments with a universal standard. Yes, even the Klingons can calibrate in their own galaxy, far, far away. For those physicists who know the value of even small amounts of mass, 1 AMU is equal to 1.66054x10^-24 grams. Before you scoff, just be reminded that E=mc^2, so while m, mass, may be small, c^2 (speed of light squared) is very large.

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.

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:

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:

The average speed of a body is the ratio of distance covered to time taken.

From the question, we have the following parameters;

Distance covered = 4.4 * 10^9 miles or 7081.1136 meters

Time taken = 2.0 years or 6.307 * 10^7 seconds

Average speed = Distance covered/ Time taken

Average speed = 7081.1136 meters/6.307 * 10^7 seconds

Average speed = 1.12 * 10^-4 m/s

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Answer:

[tex]\boxed {\boxed {\sf 5 \ m/s^2 }}[/tex]

Explanation:

We are asked to find the acceleration of a shopping cart, given the force and mass. According to Newton's Second Law of Motion, force is the product of mass and acceleration.

[tex]F= m \times a[/tex]

The mass of the shopping cart is 12 kilograms and the force is 60 Newtons. Let's convert the units for force. 1 Newton is equal to 1 kilogram meter per second squared, so the force of 60 Newtons is also 60 kilogram meters per second squared.

Substitute the values into the formula.

[tex]60 \ kg *m/s^2 = 12 \ kg \times a[/tex]

We are solving for the acceleration, so we must isolate the variable a. It is being multiplied by 12 kilograms. The inverse operation of multiplication is division, so we divide both sides by 12 kg.

[tex]\frac {60 \ kg *m/s^2 } { 12 \ kg}= \frac{12 \ kg \times a }{12 \ kg}[/tex]

[tex]\frac {60 \ kg *m/s^2 } { 12 \ kg}=a[/tex]

The units of kilograms cancel.

[tex]\frac {60 \ m/s^2 } { 12 }=a[/tex]

[tex]5 \ m/s^2 =a[/tex]

The acceleration of the shopping cart is 5 meters per second squared.

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:

El rendimiento de tubérculos de la papa es vulnerable a las altas temperaturas y se ve desafiado por el aumento asimétrico de las temperaturas diurnas y nocturnas. Este estudio tuvo como objetivo evaluar la fotosíntesis, el crecimiento de biomasa, la distribución de la masa de tubérculos y el rendimiento de tubérculo seco en papas cosechadas temprano que se cultivaron en el campo bajo condiciones de alta temperatura diurna y nocturna durante diferentes etapas de crecimiento.

Aluminum is too high in the electrochemical series (reactivity series) to extract it from its ore using carbon reduction. The temperatures needed are too high to be economic. ... The aluminum oxide has too high a melting point to electrolyse on its own. The usual aluminum ore is bauxite.

Answer:

definitely A

because proton is +1

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 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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Answer:

The study of properties for all things living and non-living

Answer: B

Explanation: The engine cycle begins with the intake stroke as the piston is pulled towards the crankshaft (to the left in the figure). The intake valve is open, and fuel and air are drawn past the valve and into the combustion chamber and cylinder from the intake manifold located on top of the combustion chamber.

Answer:

0.021 in scientific notation is 2.1 x 10^-2

Explanation:

Since there are two zeros before the non-zero digits, 10 should be raised to -2.

hope this helps

Using scientific notation, one can express extremely big or extremely small values. When a number between 1 and 10 is multiplied by a power of 10, the result is represented in scientific notation. 0.021 in scientific notation is 2.1 x 10⁻².

A way to express numbers that are either too large or too little to be conveniently stated in decimal form is through scientific notation. It is also known as "scientific form" in Britain, because scientists, mathematicians, and engineers frequently use it for intricate calculations involving large numbers.

A condensed manner of writing numbers is known as scientific notation (also known as standard form). A number is represented by a number from 1 to less than 10, multiplied by a power of 10, when it is written in scientific notation.

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Answer:

Option 1 Data

Answer:

data

Explanation:

that is the answer

please 5 stars

Answer:

  1. place the bunsen burner away from any overhead shelving, equipment or lights by at least 1 foot.

2.  remove all un-needed supplies and excess chemicals from the area.

3. tie-back any long hair, take off loose jewlery, or change out of loose clothing.

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:

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

Explanation:

Hopefully this'll help you!

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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Answer:

uvo 8hih8hjfiuwubosbwbhp0heg

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:

0.052

Explanation:

0.0702 / 1.35 = 0.052