A researcher wants to study monkeys in their natural habitat, out in the wild. What type of qualitative research method is best to use?

longitudinal

observational

case study

cross-sectional

Answer:the atom has 2 negatively charged electrons outside the nucleus

Explanation:

Answer:

Chemical change

Compounds

Number of atoms of hydrogen on both side=6

Number of atoms of nitrogen on both sides=2

Number of atoms of nitrogen and hydrogen on both  sides are equal.

Explanation:

We are given that a reaction

[tex]N_2+3H_2\rightarrow 2NH_3[/tex]

It is chemical change because there is chemical reaction occurring .In physical change, no chemical reaction takes place.

It involved compound because compound  consist of two or more than two  atoms of same or different  elements . In compound , the atoms are bonded together by chemical bond.

Nitrogen is a compound because two nitrogen atoms are bonded together to form a molecule of nitrogen.Similarly , in hydrogen molecules, two hydrogen  atom are bonded together to form one hydrogen molecule.

In ammonia, 3 hydrogen and 1 nitrogen atom are bonded together to form ammonia.

On LHS

Number of atoms of hydrogen=6

Number of nitrogen atoms=2

On RHS

Number of atoms of Hydrogen=6

Number of nitrogen atoms=2

Number of atoms of every element in reactants equals to number of atoms of every element in product.

The element which has most similar chemical properties  to carbon is silicon.

These properties are defined as those properties which become evident during or after a chemical reaction after the identity of the substance is changed during chemical reaction.

These properties cannot be determined externally just by viewing the substance ,these change immensely after a substance undergoes a chemical change.These are used for identification of unknown substances and for building up chemical classifications.

The major chemical properties are flammability,toxicity,reactivity,acidity and heat of combustion.For a chemical property to be apparent , it is necessary that the structure of the substance is altered.Chemical properties are almost similar for elements in a group.

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The conversion of 200 mol of water to kilograms of water is needed to calculate the molality of 10 mol of NaCl in 200 mol of water. Thus, the correct option is A.

Molality is the measure of concentration of a solution. It is the number of moles of solute which are present in a solution that is corresponding to about 1 kg or 1000 g of solvent solution. This amount contrasts with the definition of molarity which is based on the volume of solution. A commonly used unit for molality in chemistry is mol/kg of the solvent molecule.

The formula for calculation of Molality is:

m = mol/ kg

where, m = molality of solution,

mol = number of moles of solute,

kg = kilogram of solvent

The conversion of 200 mol of water to kilograms of water is necessary for the calculation of molality of the solution.

Here, Solute (mol) = 10 mol NaCl

Solvent (Kg) = 200 mol water (Convert to kilograms of water).

Therefore, the correct option is A.

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Your question is incomplete, most probably the complete question is:

What would you need to do to calculate the molality of 10 mol of NaCl in 200

mol of water?

A. Convert the 200 mol of water to kilograms of water.

B. Convert the 200 mol of water to liters of water.

C. Convert the 10 mol of NaCl to grams of NaCl.

D. Convert the 10 mol of NaCl to kilograms of NaCl.

For this case what you should do is keep in mind the following conversions:

[tex] 1 milliliter = 1 cm ^ 3 [/tex]

[tex] 1000 milliliters = 1 L [/tex]

Therefore, by applying the conversions we have:

For cubic centimeters:

[tex] (10,300mL) (1\frac{cm^3}{mL}) = 10,300cm ^ 3 [/tex]

For liters:

[tex] (10,300mL) (\frac{1}{1000}\frac{L}{mL}) = 10.3 L [/tex]

Answer:

10,300 milliliters is the same as:

[tex]10,300cm ^ 3[/tex]

[tex]10.3 L[/tex]

In the two-step reaction involving chlorine, ozone, and oxygen, chlorine acts as the catalyst because it helps speed up the reaction and is not used up in the process. Chlorine monoxide acts as the intermediate since it is formed in one step and then consumed in a following step.

In the given reactions, the species that functions as a catalyst is the chlorine atom (Cl). The reason it is a catalyst is because it is not consumed in the overall reaction; it speeds up the process by reacting with ozone to form ClO which then reacts with another oxygen atom to reform Cl and thus is available for further reaction.

On the other hand, the species that acts as an intermediate is Chlorine monoxide (ClO). An intermediate is a species which is produced in one step of a reaction and consumed in a later step, and thus does not appear in the overall equation. In this case, ClO is formed in the first reaction and then reacts in the second step to produce Cl and O2 thereby not appearing in the overall reaction.

These reactions are particularly significant in the study of the depletion of the ozone layer in the stratosphere. This often occurs due to the breakdown of chlorofluorocarbons (CFCs) which release chlorine atoms that can catalyze the destruction of ozone.

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Final answer:

The density of the substance is 1.70 g/mL.

Explanation:

The density of a substance can be calculated using the formula:

Density = Mass/Volume

In this case, the mass is given as 45.00 g and the volume is given as 26.5 mL. We can use these values to calculate the density:

Density = 45.00 g / 26.5 mL

Density = 1.70 g/mL

Therefore, the density of the substance is 1.70 g/mL.

Answer : The ions present in the solution of [tex]K_2CO_3[/tex] are [tex]K^+[/tex] and [tex]CO^{2-}_3[/tex] in aqueous state.

Explanation :

When [tex]K_2CO_3[/tex] is in aqueous solution then they dissociates into their ions.

The reaction in aqueous medium is,

[tex]K_2CO_3(aq)\rightarrow 2K^+(aq)+CO^{2-}_3(aq)[/tex]

The charge on potassium ion is +1 and on carbonate ion is -2. To neutralize the charge on carbonate ion, two potassium ion must be used.

Therefore, the ions present in solution of [tex]K_2CO_3[/tex] are [tex]K^+[/tex] and [tex]CO^{2-}_3[tex] in aqueous state.

[tex]\boxed{{{\text{K}}^ + },\;{\text{CO}}_3^{2 - }}[/tex] are the ions present in the solution of [tex]{{\text{K}}_{\text{2}}}{\text{C}}{{\text{O}}_{\text{3}}}[/tex] . Both ions are in the aqueous phase.

Further Explanation:

Chemical bond:

The attraction between atoms, molecules or ions which results in the formation of chemical compounds is known as a chemical bond. It is formed either due to electrostatic forces or by the sharing of electrons. There are many strong bonds such as ionic bonds, covalent bonds, and metallic bonds while some weak bonds like dipole-dipole interactions, London dispersion forces, and hydrogen bonding.

Ionic compound:

Ionic compounds are the compounds that are formed from the ions of the respective species. Ions are the species that are formed either due to loss or gain of electrons. A neutral atom forms cation by the loss of electrons and anion by the gain of electrons.

Following are some of the properties of ionic compounds:

1. These are hard solids.

2. High melting and boiling points.

3. Good conductors of heat and electricity.

4. High enthalpy of fusion.

For example, [tex]{\text{MgC}}{{\text{l}}_2}[/tex] is an ionic compound formed from one [tex]{\text{M}}{{\text{g}}^{2 + }}[/tex] and two [tex]{\text{C}}{{\text{l}}^ - }[/tex] ions. Its dissociation occurs as follows:

[tex]{\text{MgC}}{{\text{l}}_2}\rightleftharpoons {\text{M}}{{\text{g}}^{2+}}+{\text{2C}}{{\text{l}}^ - }[/tex]

[tex]{{\mathbf{K}}_{\mathbf{2}}}{\mathbf{C}}{{\mathbf{O}}_{\mathbf{3}}}[/tex]  is an ionic compound that consists of two [tex]{{\mathbf{K}}^{\mathbf{ + }}}[/tex] ions and one [tex]{\mathbf{CO}}_{\mathbf{3}}^{{\mathbf{2 - }}}[/tex] ion. Therefore it dissociates to form two [tex]{{\text{K}}^ + }[/tex] ions and one  [tex]{\text{CO}}_3^{2 - }[/tex] ion. The reaction for dissociation of  [tex]{{\mathbf{K}}_{\mathbf{2}}}{\mathbf{C}}{{\mathbf{O}}_{\mathbf{3}}}[/tex] is,

[tex]{{\text{K}}_2}{\text{C}}{{\text{O}}_3}\left({aq}\right)\to2{{\text{K}}^ + }\left( {aq} \right)+{\text{CO}}_3^{2 - }\left({aq}\right)[/tex]

So the ions present in [tex]{{\text{K}}_2}{\text{C}}{{\text{O}}_3}[/tex] solution are two [tex]{{\text{K}}^ + }[/tex] and one [tex]{\text{CO}}_3^{2 - }[/tex] ions. Both the ions are present in the aqueous phase.

Learn more:

1. Identification of ionic bonding: https://brainly.com/question/1603987

2. Oxidation and reduction reaction: https://brainly.com/question/2973661

Answer details:

Grade: High School

Subject: Chemistry

Chapter: Ionic and covalent compounds

Keywords: K2CO3, K+, CO32-, ionic compound, ions, one, two, dissociation, reaction, ions, cation, anion, electrons, chemical bond, attraction, properties, aqueous phase.

Answer:

Plastics are synthetic organic compounds

Explanation:

Final answer:

The existence of discrete energy levels in an atom can be inferred from the characteristic emission and absorption spectra unique to each element, which result from the quantized energy levels of electrons.

Explanation:

The existence of discrete (quantized) energy levels in an atom may be inferred from the emission and absorption spectra that have been known for over a century to be discrete or quantized. These spectra are unique to each element and are due to the quantized energy levels of electrons in atoms. When an electron jumps from one energy level to another, it must absorb or emit a photon with energy equal to the difference between these two energy levels; this creates specific lines in an atom's spectra. This phenomenon confirmed the idea that electrons occupy discrete orbits around the nucleus, a concept that is foundational for quantum mechanics and was part of what led to Bohr's Nobel Prize-winning work.

Answer:

25°C and 1 M reactants

Explanation:

The standard conditions to measure the reduction potential as standard electrode potential is 298.15 K temperature (25°C) and 1 mol / L concentration of each reactant.

The pressure should be 1 atm for gaseous reactants (like in case of Standard hydrogen electrode where pressure of hydrogen gas is taken to be 1 atm).

Answer:

There are 1.44 x 10^23 atoms of oxigen in 6.90 grs of Al2(SO4)3.

Explanation:

To solve this problem you have to find:

1) The molecular mass of Al2(SO4)3;

2) Estimates the percentage of oxigen and express it in terms of its moles.

3) Calculate the number of atoms using Avogadro´s Number.

1) Molecular mass Al2(SO4)3= 2x26,98 + 3x31.06 + 12x16 =339.14 grs/mol.

2) If in the molecular mass of the compound there are 192 grs/mol (12x16) of oxigen, in 6.90 g will be:

192 grs/mol Oxigen ------------- 339.14 grs/mol Al2(SO4)3

x= 3.90 grs/mol--------------------  6.90 grs/mol  Al2(SO4)3

Then if one mol of oxigen has a mass of 16 grs, 3.90 grs represents....

1 mol oxigen ------------- 16 grs of oxigen

x= 0.24 moles------------ 3.90 grs of oxigen

3) There are 6,022 x 10^23 (Avogrado´s number) atoms of oxigen in a mol of oxigen, so in 0.24 moles will be

1 mol oxigen ---------------- 6,022 x 10^23 atoms of oxigen

0.24 moles oxigen ------- x = 1.44 x 10^23 atoms of oxigen.

Summarizing there are 1.44 x 10^23 atoms of oxigen in 6.90 grs of Al2(SO4)3.

Answer: A.) are reasonable and testable

A hypothesis can be defined as the supposition or assumption of scientific process that is based on limited scientific evidences and used as a starting point for further investigation. The hypothesis needs to be proved by following relevant scientific methodology.

In the given situation, both the hypothesis are correct because both warm temperature and sunlight are genuinely responsible for wilting of plant in nature. The effect of both sunlight and warm temperature can be tested separately on plant. This proves that the hypothesis are reasonable and testable.

Three glucose molecules would require 18 carbon atoms, 36 hydrogen atoms, and 18 oxygen atoms.

The formula for glucose is C6H12O6, which means each molecule of glucose is made up of 6 carbon atoms, 12 hydrogen atoms, and 6 oxygen atoms. Thus, for three glucose molecules, you would need 3 times the amount of each type of atom. So, you would need 18 carbon atoms, 36 hydrogen atoms, and 18 oxygen atoms.

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Clastic sedimentary rocks form from the deposition of eroded particles of rock. Chemical or non-clastic sedimentary rocks form through chemical precipitation. Organic deposits are products of biological activity and the remains are deposited and consolidated into rock.

The atomic mass of an element is calculated by taking the weighted average of the mass numbers of all its naturally occurring isotopes, calculated by the sum of the protons and neutrons in an atom.

The atomic mass of an element is primarily the total mass of its protons and neutrons. Electrons have a negligible mass and thus are not typically included in the atomic mass calculation. To calculate the atomic mass of an element, you first need to know its mass number, which is the sum of the number of protons and neutrons.

The number of protons is the element's atomic number, and it defines the type of element. For example, carbon (C) has an atomic number of 6, hence it has 6 protons. Carbon's most common isotope has 6 neutrons, therefore, its mass number is 12.

However, because elements can have multiple isotopes with different numbers of neutrons, the atomic mass listed on the periodic table is a weighted average of the mass numbers of all the naturally occurring isotopes of an element. For instance, chlorine (Cl) has an atomic mass of 35.45 because it mainly exists as isotopes with mass numbers of 35 (17 protons and 18 neutrons) and 37 (17 protons and 20 neutrons).

Answer:

Mendeleev's periodic table was a useful tool because it enables scientists to predict properties of unknown elements.

Explanation: