Which statement or question is a good hypothesis?
A. Taxicabs are yellow.
B. Red cars are cooler than green cars.
C. Black cars heat up faster in sunlight than white cars.

D. What color of car sells best?

An element is any naturally occurring substance found on Earth that is normally identified by the atomic number (option D).

An element is the simplest chemical substances that cannot be decomposed in a chemical reaction or by any chemical means and made up of atoms all having the same number of protons.

Chemical elements are arranged in accordance with their atomic numbers on the periodic table.

Each element has its own unique symbol but are usually identified by its atomic number. All elements possess its own atomic number.

Therefore, an element is any naturally occurring substance found on Earth that is normally identified by the atomic number.

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The term that can be used to describe this model element compound or molecule is compound. The correct option is b, compound.

Chemical Compounds are substances that are made by joining two or more chemical elements or substances. Compounds are always made of two or more elements.

The picture is given of ammonia, which is made up of nitrogen and hydrogen. The formula of ammonia is NH₃. The compounds are made up of the joining of molecules that are the smallest unit of these compounds.

Thus, the term that will use is compound. The correct option is b.

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The missing image is added below:

If the air pressure is reduced, the pointer or hand of the Torricelli's mercury barometer sinks or falls to the bottom.

An inverted (upside-down) glass tube standing in a mercury bath is a Torricellian barometer, also known as a mercury barometer. Some of the mercury's surface particles climb up the tube as a result of air pressure pushing down on it. The mercury rises more rapidly when air pressure increases.

A tall closed tube placed upside-down in a mercury bath, which is a thick liquid metal at room temperature, creates the simplest type of barometer, with the liquid rising partially up the tube as it does in a thermometer. Because mercury is more practical than water for barometers, we utilize it instead. Due to its lower density than mercury, water will be lifted by air pressure significantly higher up a tube than the same volume of mercury.

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A – This is the crest, the higher point of the wave

B – This is the amplitude of the wave. It is the point of maximum displacement

C – This is the trough of the wave

D – This is the wavelength of the wave.

A wave is a disturbance, along a medium that transfers energy. We know that a wave is a progressive wave if it moves from one point to another. There are several ways by which we could classify waves.

Waves could be classified as mechanical waves or as electromagnetic waves or as stationary waves and travelling waves or even as transverse waves and longitudinal waves.

In any case, the wave that we have in this image is a travelling wave and we need to obtain the parts of the wave as has been shown in the image that is attached here.

Let us identify the parts of the wave as shown;

A – This is the crest, the higher point of the wave

B – This is the amplitude of the wave. It is the point of maximum displacement

C – This is the trough of the wave

D – This is the wavelength of the wave.

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Answer:

b

Explanation:

well acids are acidic and bases are basic so they nutralize it

Option (b) They can neutralize acids, which is true about bases.

A substance that neutralizes acid is a base and this is soluble in water and is an alkali. however, all bases are not soluble in water. for that reason, All alkali are based totally however all bases are not alkali.

Bases are known as Arrhenius bases, Brønsted bases, and Lewis bases. All definitions agree that bases are substances that react with acids as firstly proposed by G.-F. Rouelle in the mid-18th century.

Neutralize acids, a susceptible base is used. Bases have a sour or astringent taste and a pH of more than 7. common bases are sodium hydroxide, potassium hydroxide, and ammonium hydroxide. Bases are neutralized by means of the usage of a weak acid.

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Answer:

poh = .253

p h2o= p[H+] +P[OH-]

ph2o is 14

14= pH+ + poH

14 = pH+ +.253

14-.253 =pH+

13.747 =ph+

and we know that

log [H+] = -pH+

[H+] = antilog pH+

H+ = antilog 13.747

H+ = 1.79×10-15

The answer of the calculations above in scientific notation are a=8.3 ×10³, b= 3.9 × 10^¹um, c= 1.4 × 10³gmol, d= 5.6× 10²km

In calculation of various expressions, the results can be expressed in a scientific notation which is a way to compress cumbersome figures.

4.2 × 104 = 436.8

7.9 × 10³ = 7900

436.8 + 7900 = 8,336.8

The scientific notation= 8.3 ×10³kg

5.23 x 106 um = 554.38um

554.38 × 7.1 = 3,936.1

3,936.1 × 10^-²

3.9 × 10³ × 10^-²= 3.9 × 10^¹um

The scientific notation= 3.9 × 10^¹um

5.44 x 107 g = 582.08g

8.1 x 104 mol = 842.4 mol

582.08g+ 842.4 mol = 1,424.48

The scientific notation = 1.4 × 10³gmol

8.40 x 105 km = 882km

3.1 × 105 = 325.5km

882km - 325.5km = 556.5

The scientific notation = 5.6× 10²km

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Coordination numbers are defined for the crystalline structures that tell about the numbers of atoms bonded to the central atom. The coordination number of a diamond is 4.

A coordination number has been defining the number of the ions, atoms, and molecules that are bonded to the central atom of the crystalline compound or a complex.

The diamond has 8 carbon atoms in its one unit and its coordination number is 4 as its lattice type is face-centered cubic that has carbons at the corners and face center of the structure. One carbon contributes 1/8 hence and the faces center contributes 1/2.

Therefore, the diamond has a coordination number of 4.

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The reasonable ground - state electron configuration is 1s² 2s²2p⁶

1) Electron configuration is defined as the arrangement of electron in the atomic orbtials.

2)The ground state electron configuration is lowest energy level and have most stable arrangement.

3) An excited state configuration is a higher energy level.

4) According to Aufbau principle ., electrons will occupy the orbitals of lower energies first then occupying higher energy orbitals.

5) Energy of orbitals is calculated by the sum of principle quantum number and azimuthal quantum numbers.

6) The rule of electron filling in the orbital is from lower energy level to higher energy level.

7) According to this rule electrons are filled in the order of 1s 2s 2p 3s 3p 4s 3d 4p 5s ........and so on.

8) According to pauli principle , maximum two electrons, having opposite spin can fit in orbital.

9) According to Hund's rule , orbital in given sub-shell is singly occupied by electrons before filling second electron in an orbital.

10) The ground state configuration is the arrangement of electron around the nucleus of an atom with lower energy levels.

Hence,The reasonable ground-state electron configuration is 1s² 2s² 2p⁶

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The concentration of a solution that has 3 moles of c6h12o6 dissolved in 9 liters of water is 0.33M

Concentration is defined as the ratio of number of moles of solute to the volume of the solution.

Concentration = number of moles of solute/ Volume of solution

It is defined as the ratio of given mass of substance to the molar mass of substance.

Given,

given mole of solution = 3 mol

Volume of the solution = 9L.

C = 3/9

C = 1/3

C = 0.33M

Thus, we calculated that the concentration of a solution that has 3 moles of c6h12o6 dissolved in 9 liters of water is 0.33M.

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The number of electrons present in the outermost shell is called valence electrons.

The number of electrons present in the last shell is called valence electrons. The atomic number of sodium is 11 and the atomic number of oxygen is 8.

There is 1 valence electron in sodium. The number of valence electrons in oxygen is 2.

The atomic number of iodine is 53. The number of the valence electron in iodine is 1. The atomic number of calcium is 20. The valence electron in calcium is 2.

Therefore, The number of electrons present in the outermost shell is called valence electrons.

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Answer:

1 Answer. fruity · Stefan V. The answer is 2.5 g/cm3 .

Explanation:

Answer:

Alpha radiation/ alpha decay

This statement is true.

Amphiprotic species means molecule or ion which can either donate or accept a proton depending on their circumstances. we identify the amphiprotic species it must contain hydrogen atom that can be released a proton. it also must be capable of accepting proton from the compound. amphiprotic species must also have lone pair of valence electron and a hydrogen atom that can be donated as a proton H+

So it is true.

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Wavelength of (nm) of photon emitted is 438nm

Wavelength is the distance between identical points means adjacent crest in the adjacent cycles of a waveform signal propagated in space or along a wire

Here in the given data is photon emitted when electron drop at 7th orbital means n = 7 and n = 1 for hydrogen atom and redberg constant is also given = 1.097×10⁷m⁻¹

we have to find wavelength = ?

Expression of wavelength of radiation is

1/λ = R (1/n₁² - 1/n₂²)

1/λ = 109677×(1/7²- 1/1²)

1/λ =  109677×48/49

λ = 438.69cm = 43869m

λ = 438nm

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Dependent variable - backpack produced

Independent variable -  types of cloth

Control group - backpack without cloth.

In an experiment, you have the dependent and the independent variable. The independent variable is the variable that we have to change in the experiment. The independent variable is the variable that changes as we change the values in of the independent variable.

Now, we can see that the experiment is about testing which type of cloth is best for backpacks. The independent variable in this case has to be the types of cloth while the dependent variable is the backpack produced. The control group is the backpack without cloth.

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Answer:

A strong acid or a strong base should be neutralized before pouring down a drain.

Explanation:

Always make sure to add acid to water (not vice-versa) to avoid a nasty exothermic reaction :)

According to the research, the correct option is a bar graph. It is the best way to show the lead levels in six contaminated water wells.

It is a graph that is used to show the changes that the data have undergone by graphing the data in bars, representing the frequencies by means of columns (or bars), through their height in a Cartesian plane.

It is a way of summarizing a set of data by categories, allowing different values to be compared using bars of different sizes.

Therefore, we can conclude that according to the research, the correct option is a bar graph. It is the best way to show the lead levels in six contaminated water wells.

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Answer:

D

Explanation:

this is because the number of protons is always equal to the number of electrons of an atom

The periodic table has changed very little since it was originally developed by Mendeleev and Meyer is referred to as a false statement.

This is defined as the arrangement of elements based on their atomic number in a tabular form. It consists of 18 vertical columns which re referred to as groups and seven horizontal rows called period.

Henry Moseley in 1913 organized Mendeleev's periodic table based on physical properties.This took into consideration their atomic number rather than atomic mass and other missing elements.

This is the periodic table which is used currently and therefore hasn't changed much which is why false was chosen.

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Answer:

control variable

Explanation:

hope this helps :)

1375.5 kg ice (in kg) there is in Greenland if the island  

Given data is 85% of Greenland is covered in ice  thickness = 1500 meters 840000 square miles,  density = 0.917 g/mL, one mile = 1.60 kilometers.

Here  1.60 kilometers = 0.6177 square miles we have to find ice (in kg) = ?

Here density is given and thickness also given means volume so we have to find mass in kg = ?

Density = mass/volume

0.917 g/mL = mass/ 1500

Mass = 0.917 g/mL× 1500

Mass = 1375.5 kg of  ice there is in Greenland if the island

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The mass of dinitrogen tetroxide the number of Nitrogen atoms are 46 x 10^9 gram

Given:

number of nitrogen atoms = 1 x 10^12 atoms

To Find:

mass of dinitrogen tetroxide

Solution:

From the molecular formula of dinitrogen tetraoxide;

molar mass of dinitrogen tetraoxide = 92 g/mol

92 g of dinitrogen tetraoxide contains 2 atoms of nitrogen

x g of dinitrogen tetraoxide will contain 1 * 10^12 atoms of nitrogen

x = 92*1* 10^ 9/2

x = 46 x 10^9 gram

Hence, the number of Nitrogen atoms are

Hence, the number of Nitrogen atoms are 46 x 10^9 gram

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Answer:

The mass of dinitrogen tetroxide the quantity of Nitrogen particles are 46 x 10^9 gram

Number of nitrogen atoms = 1 x 10^12 atoms

Explanation:

From the atomic Formula of dinitrogen tetraoxide;

molar mass of dinitrogen tetraoxide = 92 g/mol

92 g of dinitrogen tetraoxide contains 2 molecules of nitrogen

x g of dinitrogen tetraoxide will contain 1 * 10^12 molecules of nitrogen

x = 92*1* 10^ 9/2

x = 46 x 10^9 gram

the quantity of Nitrogen molecules are 46 x 10^9 gram

For one thing, carbon atoms are remarkable in the chemical world because they can combine to form extraordinarily long, strong chains with branches or rings of varying widths. The correct option is D.

The most distinctive feature of a carbon atom is its ability to self-combinate or catenate. This characteristic is very important since it produces a lot of organic or carbon-based chemicals. Numerous atoms can be joined to the lengthy carbon chain in various ways to create a vast array of carbon compounds.

Since carbon possesses four valence electrons, it can make four covalent bonds to reach its full outer energy level. It creates molecules known as hydrocarbons when it solely forms bonds with hydrogen.

Thus the correct option is D.

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Only 2.5 moles of CO2 can be produced since oxygen is the limiting reaction.

4molCH4 x (1molCO2/1molCH4) =4 mol CO2

5 mol O2 x (1molCO2/2molO2) =2.5 molCO2

Only 2.5 moles of CO2 can be produced since oxygen is the limiting reaction.

Co2 is used as a refrigerant, in extinguishers, to blow coal, foam rubber and plastics, inflate life rafts and life jackets, blast coal, promote plant growth in greenhouses, immobilise animals before slaughter, and in carbonated drinks.

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Answer:

protons 16 elecrons 16

Explanation:

this is because we say that the number of protons is equal to the number of elecrons in a give Element.

Answer:

3.141592653589793238

Explanation:

3.141592653589793238

The molar mass of the unknown compound in the aqueous solution was 223.2 g/mol.

Osmotic pressure can be described as the minimum pressure requires to be applied to a solution to stop the flow of its pure solvent across a semipermeable membrane. The measurement of the tendency of a solution to take in a pure solvent by osmosis is osmotic pressure.

To determine the molar mass of a compound from the given weight, the concentration of the compound needs to be determined.

π = i ×MRT

8.44 = 1×M× 62.36 ×298

M = 4.54 × 10⁻⁴ M

Given the mass of the unknown compound = 15.2 mg = 0.0152 g

The volume of the compound = 150 ml =0.150 L

From the molarity of the compound, we can determine the molar mass as:

Molarity = mass/(Molar mass × Volume)

Molar mass =  mass/(Molarity × Volume)

Molar mass = 0.0152/ (4.54 × 10⁻⁴ × 0.150)

Molar mass = 223.2 g/mol

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20 standard amino acids are available. Based on the structure and properties of the side chains, these amino acids can be divided into seven classes.

1. Alkyl groups

2. Sulfur-containing

3. Alcohols

4. Acids

5. Bases

6. Aromatics

7. Amides

a) Basic (contains a guanidinium group as the side chain)

b. Neutral (contains an alkyl side group)

c. Acidic (contains a carboxylic acid side chain)

d. Polar (contains an amide side chain)

e. Polar (contains a phenol side chain)

f. Non-polar (contains a benzene side chain)

g. Neutral (contains H as the side chain)

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The Complete question is mentioned below:

Classify the following amino acids as nonpolar, polar but neutral, acidic, or basic.

(a) Arginine

(b) Leucine

(c) Glutamic acid

(d) Asparagine

(e) Tyrosine

(f) Phenylalanine

(g) Glycine

The given chemical reaction between acetic acid and sodium hydroxide has sodium acetate and water as its products.

The balanced equation of a chemical reaction between acetic acid and sodium hydroxide is:

[tex]CH_3COOH (aq) + NaOH (aq) \rightarrow CH_3COONa (aq) + H_2O (l)[/tex]

This reaction is a neutralization reaction between a weak acid (acetic acid) and a strong base (sodium hydroxide).

In a neutralization reaction, an acid and a base mix chemically to provide salt and water as the final products. [tex]H^+[/tex] ions and [tex]OH^-[/tex] ions combine to generate water during a neutralization process. Because acid and base balance each other out to create a neutral chemical, this reaction is therefore known as a neutralization reaction.

In a balanced equation, the number of atoms of each element remains the same before and after the reaction. Therefore, in this reaction, on the products side, the number of atoms of Carbon (C) is 2, Hydrogen (H) is 5, Oxygen (O) is 3 and Sodium (Na) is 1.

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Answer:

When an acid reacts with a base, they undergo neutralization and their opposite pH levels cancel each other out. This happens through the double displacement of ions or, put simply, the ions switch partners.

Explanation:

When an acid and a base are placed together, they react to neutralize the acid and base properties, producing a salt. The H(+) cation of the acid combines with the OH(-) anion of the base to form water. The compound formed by the cation of the base and the anion of the acid is called a salt.

An example of neutralization reaction is: HCL + NaOH ⇆ NaCl +

acid + base ⟶ water + salt.

HCl(aq) + KOH(aq) ⟶ H 2O(ℓ) + KCl(aq)

2 HCl(aq) + Mg(OH) 2(aq) ⟶ 2 H 2O(ℓ) + MgCl 2(aq)

HCl(aq) + NH3(aq) ⟶ NH4Cl(aq)

Answer:

neutralize one another and produce salts

Explanation:

When mixed, acids and bases neutralize one another and produce salts, substances with a salty taste and none of the characteristic properties of either acids or bases.