Look at the data in Figure 1. Fresh water has a salinity close to 0%. What is the surface tension for fresh water?

Answer:

Beta radiation

Explanation:

we know the three types of nuclear radiation:

okay so first look at the mass number of both the product and reactant, we notice that the mass number for both remains 35.

immediately we can cross of the possibility of it being alpha radiation because an alpha particle is similar to that of helium nucleus, hence if it was alpha, the mass number of Cl would be 4 less.

now look at the atomic number, we notice that moving from S to Cl it increased by 1 which can only mean it was beta radiation.

Beta radiation is when a neutron inside to nucleus turns into a proton and an electron, the electron is ejected from the nucleus hence it's a high speed electron.

neutron --> proton + electron

the reason the mass number is the same is because a neutron and proton has a mass of 1 whilst the electron is too small to cause much change.

the reason for nuclear decay is mainly because the elements want to achieve more stability.

260grams

The formula for calculating the moles of NaOH is expressed as

Determine the required mass of NaOH

Hence the grams of sodium hydroxide (NaOH) you need to make 6.5 L of 1.0M solution is 260grams

The term which best describes algae is Single-celled organisms or unicellular organism.

A broad and varied collection of photosynthetic eukaryotic organisms are collectively referred to as algae informally. It is a polyphyletic group that consists of species from various separate clades.

A single cell makes up a unicellular creature, also referred to as a single-celled organism, as opposed to a multicellular organism, which is made up of numerous cells.

Hence, The term which best describes algae is Single-celled organisms or unicellular organism.

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The endocrine system, producer of hormones which are chemical messengers work with the nervous system to control many different body functions such as metabolism and growth is True.

The endocrine system is a communication system that uses feedback loops to control distant target organs by controlling hormones secreted by internal glands of an organism directly into the circulatory system.

All endocrine systems in vertebrates are controlled neurally by the hypothalamus. Among the endocrine glands are: Two organs called the adrenal glands sit on top of the kidneys and secrete the stress hormone cortisol.  

The pituitary gland receives instructions from the hypothalamus in the lower middle brain about when to release hormones. The female reproductive system's ovaries, which release eggs and sex hormones.

Thus, the endocrine system, producer of hormones which are chemical messengers work with the nervous system to control many different body functions such as metabolism and growth is True.

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The elements that showcase the most similar properties are Magnesium and Calcium due to having the same valency.

Helium and Hydrogen

Helium and Hydrogen are two completely different elements. Hydrogen forms various compounds with other elements, water H2O, Ammonia NH4, and carbohydrates C6H12O6 whereas Helium being a noble gas is a stable element that contains 8 electrons in its valence shell, i.e. the ideal amount and so does not react with other elements to make compounds.

Magnesium and Calcium

Magnesium and calcium have similar properties as they both contain only 2 electrons in their valence shell. Since all chemical properties are in one way or another dependent on valency, they display similar behavior.

Helium and Carbo

Helium a noble gas contains 8 electrons in its valence shell causing it to have no need to react with other elements. Thus Helium does not form any compounds whereas Carbon on the other hand containing 4 electrons in its valence shell is among the best elements for chain compounds. Due to carbon's ability to accept and donate the same amount of electrons as well as sharing electrons, it is the major element in all biotic materials.

Magnesium and Iron

Magnesium contains 2 electrons in its valence shell and has a tendency to lose them to attain Mg2+ ion. Magnesium has a set valency whereas Iron has multiple vacancies. Depending on the state of Iron it may exhibit a valency of 2 or 3. Due to Iron having a valency of 3 as well as 2 it differs from Magnesium in its chemical properties.

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Answer: 2.1M

Explanation:

   Hence, the molarity of a solution of ethanol in water is 2.1M.

Answer:

Joules/sec and watts.

Explanation:

1 Joule/sec is a rate of energy expending every second.  It is equal to a watt, the English term.

Sigma bonds are single bonds formed by the head on collision between orbitals and pi -bonds are double bonds or triple bonds which are weaker than sigma bonds. There are 7 sigma bonds and one pi bond in acetic acid.

Acetic acid is a weak organic acid formed from methane croup. Its diluted form as vinegar is used as preservatives. Acetic acid contains the COOH acidic group. Where the C=O group is called carbonyl group.

A sigma bond is formed between head on overlap of two orbitals. It is more strong and forms single bonds. Pi bonds are formed by the sidewise overlapping of p orbitals. They are weak. In a double bond such as in C=O group one bond is pi bond and one is sigma bond.

First carbon in acetic acid forms sigma bonds  with 3 hydrogens and one carbon and the second carbon has a sigma bond with an OH group. Thus there a total of 7 sigma bonds and 1 pi bond.

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The Bohr model is a representation of the electronic configuration of the atom. According to this model, each energy level can hold a certain number of electrons. In the first energy there can only be 2 electrons, in the second and the following energy levels there can be a maximum of 8 electrons.

Sodium, Na which has 11 electrons in total so in the first level it will have two electrons, in the second level it will have 8 electrons and in the third level it will have the missing electron.

In the model proposed by the student, the electrons are represented in blue. The model proposed by the student is incorrect.

We see that in the second energy level he drew 9 electrons, this is incorrect since from the second energy level there can only be 8 electrons, the remaining electron must be located in the third energy level.

In these given options, flooding is most likely to reduced human population.

Therefore, the infrastructure in our environment and the ecosystem itself may be harmed by severe flooding. They can first demolish houses and render them inhabitable. Additionally, they can clear farms of sand, which makes it harder to cultivate crops. In addition to the aforementioned, flooding taints clean water, resulting in illnesses.

Limiting variables prevent populations from growing either through increased death rates or emigration, decreased birthrates or immigration, or a combination of these factors.

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Answer:

You can find p-block elements on the periodic table in groups 13 to 18, you can find the s-block on the periodic table in group 1, Group 3 through Group 12 are d-block elements, and The f-block elements, found in the two rows at the bottom of the periodic table, are called inner transition metals and have valence electrons in the f-orbital's.

Explanation:

Hope this helps!

Answer: A. The population is growing rapidly

Copper(II) sulfate.

Before we name the given compound, we need to know what chemical compounds are. Chemical compounds are chemical substances composed of molecules formed from atoms of an element and held together by a chemical bond.

Given the chemical compound CuSO4, this compound contains copper, sulfur, and oxygen element.

The molecular compound CuSO4 is named with the first element first and then the second element by using the stem of the element name plus the suffix -ate

The compound name for CuSo4 will therefore be Copper(II) sulfate. The roman numeral of (II) comes from the sum of the oxidation state of the element.

Note that the oxygen atoms have a -2 oxidation number, and sulfur has a +6, oxidation number to have (4 * -2) + 6 = -2. This makes copper have an oxidation number of +2.

When a candle is lit, a combustion reaction takes place that releases heat, this heat causes the temperature of the candle to increase and the state of the candle to be liquid. Molecules move due to heat.

When the candle blown out, the temperature begins to decrease and the liquid wax begins to solidify because the molecules move slower and slower. Therefore, the spaces of the obtained can be filled in the following way:

When the candle was blown out the wax solidifies because the molecules have low energy and moved slower.

The formula NaO,CaO represents one ionic compound and one covalent compound.

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Answer:

Explanation:

Here, we want to get the chemical formula for the compound

From what we have, the compound contains hydrogen and carbon only

We also were given that the molar mass is 28.06 amu

Now,we beed to get the individual atomic mass of carbon and hydrogen

From records, carbon has an AMU of 12.01

The AMU of hydrogen is 1.00794

Looking at the total value, we can see that the max possible number of atoms of carbon present is 2

Now, we need to know the number of hydrogen atoms

Let us call this n

Mathematically, we know that the AMU of the compound is the sum of the AMU of the individual atoms

Hence, we have it that:

Finally, we want to write the molecular formula of the compound

The molecular formula is written with carbon first, followed by its number of atoms as subscript, then hydrogen , with its number of atoms as subscript

We have this written as:

Answer:

Hydrogen is a Cation, the only cation that has no electrons.

¿Is hydrogen Anion or Cation

A Hydrogen, it is well known that it is a Cation, since it is a positively charged particle.

A Hydrogen is a chemical element, which is the lightest that exists, its atom is made up of a proton and an electron and it is stable in the form of a diatomic molecule (H2).

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She test this idea in the Flowing Water Model through integrated water flow model

Flowing water model is the computer programmed for simulating water flow through the integrated land surface water and groundwater flow systems and hydroelectric energy is power made by the moving water and water always flow downhills because of gravity and she She test this idea in the Flowing Water Model through integrated water flow model

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Answer

Calcium - 40 is the most stable and most likely to be found occurring naturally

Explanation

Nuclear stability means that the nucleus of the element is stable enough to not decay with the passing of time, this decay is known as radioactivity. When it comes to Calcium, we have many isotopes of this element, but only a few have such a long half-life that we can consider them to be stable, and Calcium - 40 is the most stable and common of them.

Explanation:

To find the isotope that is expected to be radioactive we have to compare the given isotopes with the ones that we find the in the periodic table.

(A) Ti:

Isotope ----> atomic mass = 48 atomic number = 22

Periodic table ---> average atomic mass = 47.9 atomic number = 22

(B) Sr:

Isotope ----> atomic mass = 88 atomic number = 38

Periodic table ---> average atomic mass = 87.6 atomic number = 38

(C) Os:

Isotope ----> atomic mass = 192 atomic number = 76

Periodic table ---> average atomic mass = 190.2 atomic number = 76

(D) Pu:

Isotope ----> atomic mass = 244 atomic number = 94

Periodic table ---> average atomic mass = 244 atomic number = 94

If we take a look at them we will see that the only one that is different is osmium. The atomic mass of the isotope is 192 amu, that means that this isotope has 2 more neutrons than the average atom of the element. So we can expect that it could be radioactive.

Answer: C. Os

Answer:

question 1:

answered previously

question 2:

a= 50% chance tall daughter

b= 50% chance short daughter

question 3:

a= 75% chance of not having cystic fibrosis

b= 25% chance of having cystic fibrosis

question 3:

Explanation:

question 2:

the question specified on the offspring being female so when stating the gametes we must include the XX chromosomes for the female and XY chromosome for the male.

let us denote that:

T = tall gene

t = short gene

Father 》 Mother

parental phenotype: Short 》 tall

parental genotype: XtYt 》 XTXt

parental gametes: (Xt) (Yt) 》 (XT) (Xt)

random fertilization:

Xt Yt

XT XTXt XTYt

Xt XtXt XtYt

F1 generation sex: Male 》Female

F1 chromosomes: XY 》 XX

F1 gen phenotype: Tall 》 Tall

F1 gen genotype: Tt, tt 》 Tt, tt

ratio: 2 : 2 or 1 : 1

percentage gender: 50% 》 50%

percentage tall: 50% 》 50%

question 3:

denoting:

N = normal (dominant)

c= cystic fibrosis (recessive)

parental phenotype: Normal 》Normal

parental genotype: Nc 》 Nc

random fertilization:

N c

N NN Nc

c Nc cc

F1 gen phenotype: Normal 》 Cystic fibrosis

F1 gen genotype: NN, Nc, Nc 》 cc

ratio: 3 : 1

percentage: 75% 》 25%

(if you have anymore questions on the topic let me know)

1.7 grams are there in 0.10 moles of OH ions.

The mole is a unit of measurement or the starting point for determining the concentration of a chemical in a sample. Avogadro's constant, or 1 mole, is a quantity that is equal to 6.022 × 10²³ particles. Any species, such as atoms, molecules, electrons, protons, neutrons, etc., can make up.

Number of moles = Mass/ Molecular mass

Given, number of moles = 0.10

Molecular mass of OH = 17 g/mol

∴ Mass = Number of moles × Molecular mass

  Mass = 0.10 × 17

  Mass = 1.7 grams

Therefore, 1.7 grams are there in 0.10 moles of OH ions.

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Before categorizing each of the properties into physical or chemical, intensive or extensive, we need to understand the terms:

Physical property: This is any characteristic that can be determined without changing the substance’s chemical identity.

Chemical property: This is any characteristic that can be determined by simply changing the molecular structure of a substance

1) For the property: Its melting point is 112 degrees Celcius is a Physical property and intensive since extensive property depends on the amount of matter being measured.

2) If a substance burns in a presence of oxygen, it is a chemical property since the molecular structure of the resulting compound will be changed. This is also an intensive property.

3) If a substance is yellow solid is a physical property since the first is the color yellow and solid shows the state of the element. Neither property implies that the substance is changing its composition. Therefore, both properties are physical properties. This physical property is Intensive properties since it does not depend on the amount of the substance present.

4) If the substance is combustible, it is a chemical property and intensive property

5) For the sample of a substance that measures 75cm^3, this is a Physical property since the volume of a substance can be determined without changing its identity. This is also an extensive property since examples of these properties include mass, weight, and volume.

The reaction of silver nitrate with copper is a substitution reaction. We have copper in its free state, Cu, and we have silver nitrate which has the formula AgNO3. The copper replaces the silver obtaining the following reaction:

The products obtained are copper nitrate and silver.

The word equation will be:

Total number of electron-pair domains (electron clouds) around the central atom in the sulfurtetrafluoride molecule is five. which includes 4 bond pair 1 loan pair.

An atom's electron domain is the number of lone pairs or chemical bond locations that surround it. It represents the number of locations expected to contain electrons. By knowing the electron domain of each atom in a molecule, you can predict its geometry.

“The electron geometry describes the spatial arrangement of a molecule’s bonds and lone pairs. VSEPR theory can be used to calculate electron geometry.”

The term electron geometry is the name of the electron pair/groups/domains on the central atom, whether they are bonding electrons or non-bonding electrons. Electron pairs are electrons that exist in pairs or bonds, as lone pairs or as a single unpaired electron. Because electrons are always in motion and their paths cannot be precisely defined, the electron arrangement in a molecule is described in terms of an electron density distribution.

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Answer: a

Explanation:

Answer: D

Explanation:

Answer:

B: ionization energy

Explanation: