What is the [H+] if the pH of a solution is 2.0?
[ ? ] × 10¹²] X [H+] =

Answer:

more genetic variation within a population usually enables more phenotypic variation.

Explanation:

Because natural selection acts directly only on phenotypes,  Some new alleles increase an organism's ability to survive and reproduce, which then ensures the survival of the allele in the population.

Genetic variation lets the organisms survive long term as it increases the phenotypic and the genotypic variation.  Genetic variation is due to the type of reproduction that involves two parents.

Genetic variation is the modification of the original genome of the organism by genetic recombination and mutation that can be beneficial in the survival and the natural selection process.

Reproduction involving two parents of the same species allow genetic variation as the process of independent assortment and crossing over of the chromosomes inherited from both creates species with different traits and genotype.

Therefore, the reproduction involving two parents results in genetic variation.

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Answer:

they become water vapor and after that, they become a type of precipitation

We need to balance the equation

\(\sf \bullet\quad H_2 + O_2 \longrightarrow H_2O \)

By adding 2 moles of \(\sf H_2 \) on the both sides

\(\sf \bullet \quad 2H_2+O_2 \xrightarrow{\;By\:balancing\;} H_2O\)

Hence, balanced !

Answer:you would need to add 36 mL of saline to achieve a continuous treatment lasting 3 hours using a nebulizer with an output of 12 mL/hr.

Explanation:

To calculate the total dosage of Albuterol solution, we need to multiply the concentration of the solution (2.5 mg/0.5 mL) by the total volume of the solution used (4 vials, assuming each vial is 0.5 mL):

Total dosage of Albuterol = (2.5 mg/0.5 mL) * (0.5 mL/vial) * 4 vials

Total dosage of Albuterol = 20 mg

Therefore, the total dosage of Albuterol solution is 20 mg.

To calculate the amount of saline that needs to be added for a continuous treatment lasting 3 hours, we can use the nebulizer's output rate of 12 mL/hr:

Amount of saline needed = Nebulizer output rate * Treatment duration

Amount of saline needed = 12 mL/hr * 3 hr

Amount of saline needed = 36 mL

To achieve a continuous treatment lasting 3 hours using the nebulizer with an output of 12 mL/hr, an additional 34 mL of saline solution would need to be added.

If each vial of Albuterol solution contains 2.5 mg in 0.5 mL, then adding 4 vials would result in a total dosage of 10 mg (2.5 mg/vial * 4 vials).

To achieve a continuous treatment lasting 3 hours using a nebulizer with an output of 12 mL/hr, we need to calculate the amount of saline solution that needs to be added.

The nebulizer has an output of 12 mL/hr, so over 3 hours, it would deliver a total volume of 12 mL/hr * 3 hrs = 36 mL.

Since we have already added the 4 vials of Albuterol solution, we subtract that volume from the total desired volume of 36 mL to determine how much saline needs to be added.

Therefore, the amount of saline to be added would be 36 mL - 2 mL (4 vials * 0.5 mL/vial) = 34 mL.

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Answer:

Its a or d if im stupid my b

Explanation:

Binary ionic compounds consist of atoms of only two atoms  and hence the term binary is given to them.

Ionic compounds or electrovalent compounds are  the type of compounds which are  formed between two elements when there is an exchange of electrons which takes place between  the atoms resulting in the formation of ions.

When the atom looses an electron it develops a positive charge and forms an ion called the cation while the other atom gains the electron and develops a negative charge  and forms an ion called the anion.

As the two atoms are oppositely charged they attract each other which results in the formation of a bond called the ionic bond and the compound is called ionic compound.

When the compounds consist of atoms  of only two elements the compound is called as a binary ionic compound.

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brittle metal would experience this type of failure

Glass, ceramic, graphite, and some alloys with very low plasticity are examples of brittle materials. In these materials, cracks can start without plastic deformation and quickly progress to brittle breakage. It is a steel-gray, lightweight metal called beryllium. It is also highly brittle, which means that it fractures easily when under stress but does not typically distort before it does so (similar to glass or ceramic). Beryllium is a naturally occurring element found in over 100 different minerals and has a wide range of modern-day applications. Cast iron has a rough feel and is more brittle because it includes 2% to 3.5% carbon. Despite being made of alloyed metals, carbon steel lacks other alloying components, hence despite being an alloy, it is not classified as an alloy.

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Answer:

Y

ou have learnt in your previous classes that the sour and bitter

tastes of food are due to acids and bases, respectively, present in them.

If someone in the family is suffering from a problem of acidity after

overeating, which of the following would you suggest as a remedy– lemon

juice, vinegar or baking soda solution?

n Which property did you think of while choosing the remedy?

Surely you must have used your knowledge about the ability of

acids and bases to nullify each other’s effect.

n Recall how we tested sour and bitter substances without tasting

them.

You already know that acids are sour in taste and change the colour

of blue litmus to red, whereas, bases are bitter and change the colour of

the red litmus to blue. Litmus is a natural indicator, turmeric is another

such indicator. Have you noticed that a stain of curry on a white cloth

becomes reddish-brown when soap, which is basic in nature, is scrubbed

on it? It turns yellow again when the cloth is washed with plenty of

water. You can also use synthetic indicators such as methyl orange and

phenolphthalein to test for acids and bases.

In this Chapter, we will study the reactions of acids and bases, how

acids and bases cancel out each other’s effects and many more interesting

things that we use and see in our day-to-day life. Do You Know?

Litmus solution is a purple dye, which is extracted from lichen, a plant belonging to

the division Thallophyta, and is commonly used as an indicator. When the litmus

solution is neither acidic nor basic, its colour is purple. There are many other natural

materials like red cabbage leaves, turmeric, coloured petals of some flowers such as

Hydrangea, Petunia and Geranium, which indicate the presence of acid or base in a

solution. These are called acid-base indicators or sometimes simply indicators.

2021–22

18 Science

2.1 UNDERSTANDING THE CHEMICAL PROPERTIES OF

ACIDS AND BASES

2.1.1 Acids and Bases in the Laboratory

Activity 2.1

These indicators tell us whether a substance is acidic or basic by

change in colour. There are some substances whose odour changes in

acidic or basic media. These are called olfactory indicators. Let us try

out some of these indicators.

Explanation:

Answer:

c. 0.220 mol H₂

Explanation:

No. of moles

\({\huge{\fcolorbox{yellow}{red}{\orange{\boxed{\boxed{\boxed{\boxed{\underbrace{\overbrace{\mathfrak{\pink{\fcolorbox{green}{blue}{Answer}}}}}}}}}}}}}\)

\( \sf C) \: 0.220 \: mol \: H_2\)

Explanation:

1 mol = 22.4 litres

4.92 = how many moles?

\( \sf \implies \frac{4.92}{22.4} \\ \\ \sf \implies 0.2196 \\ \\ \sf \implies 0.220 \: mol \: H_2\)

Answer:

The answer is 4778.4 cm (cubed)

Explanation:

V = (πr(squared)) x (h/3)

V = (π x 13(squared)) x (27/3)

V = 530.9291585 x 9

V = 4778.4

Option C, a more saturated fat is the product(s) for the hydrogenation of corn oil.

Organic molecules are frequently reduced or saturated by the process of hydrogenation, which is a chemical reaction between hydrogen (H2) and another substance or element. The process of incorporating hydrogen molecules into the various carbon-carbon bonds is known as hydrogenation. Saturated fats emerge from this process. Double bonds change into single bonds throughout this Saturated fats, and the melting point steadily increases.

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Answer:

the third one

Explanation:

When you breathe in, you inhale oxygen and exhale carbon dioxide

Answer:

214.77 g/mol

Explanation:

Tin(II) sulfate

From Wikipedia, the free encyclopedia

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Tin(II) sulfate

Tin(II) sulfate crystallizes in an heavily distorted barium sulfrate structure.

Unit cell of tin(II) sulfate.

Names

Other names

Stannous sulfate

Identifiers

CAS Number  

7488-55-3 ☑

3D model (JSmol)  

Interactive image

ChemSpider  

21106484 ☑

ECHA InfoCard 100.028.457 Edit this at Wikidata

EC Number  

231-302-2

PubChem CID  

62643

UNII  

0MFE10J96E ☑

CompTox Dashboard (EPA)  

DTXSID20884389 Edit this at Wikidata

InChI[show]

SMILES[show]

Properties

Chemical formula SnSO4

Molar mass 214.773 g/mol

Appearance white-yellowish crystalline solid

deliquescent

Density 5.15 g/cm3

Melting point 378 °C (712 °F; 651 K)

Boiling point decomposes to SnO2 and SO2

Solubility in water 33 g/100 mL (25 °C)

Structure[1]

Crystal structure Primitive orthorhombic

Space group Pnma, No. 62

Lattice constant  

a = 8.80 Å, b = 5.32 Å, c = 7.12 Å[2]

Hazards

NFPA 704 (fire diamond)  

NFPA 704 four-colored diamond

010

Flash point Non-flammable

Lethal dose or concentration (LD, LC):

LD50 (median dose) 2207 mg/kg (oral, rat)

2152 mg/kg (oral, mouse)[3]

Related compounds

Other anions Tin(II) chloride, tin(II) bromide, tin(II) iodide

Other cations Lead(II) sulfate

Except where otherwise noted, data are given for materials in their standard state (at 25 °C [77 °F], 100 kPa).

Tin(II) sulfate (SnSO4) is a chemical compound. It is a white solid that can absorb enough moisture from the air to become fully dissolved, forming an aqueous solution; this property is known as deliquescence. It can be prepared by a displacement reaction between metallic tin and copper(II) sulfate:[4]

Sn (s) + CuSO4 (aq) → Cu (s) + SnSO4 (aq)

Tin(II) sulfate is a convenient source of tin(II) ions uncontaminated by tin(IV) species.

The atomic size is determined by the interaction of these two factors, the amount of protons and the shielding effect.

The subatomic particles known as electrons orbit the atomic nucleus of an atom and are negatively charged. They are one of the basic building blocks of matter.

The atomic radius, also known as the separation between the nucleus and the outermost electrons, determines the size of an atom.

The number of protons in the nucleus, which defines the atomic number and, consequently, the number of electrons in the atom, as well as the electrons' energy level, are two parameters that have an impact on the atomic radius.

Because more electrons will occupy higher energy levels farther from the nucleus as the number of electrons grows, atoms with more electrons will typically have a bigger atomic radius than atoms with fewer electrons.

However, the amount of protons in the nucleus rises as you move across a period (left to right) in the periodic table, which intensifies the attraction of electrons to the nucleus. The atomic radius decreases as a result of the electrons moving in closer proximity to the nucleus.

Furthermore, as the number of electrons in an atom rises, the shielding effect of inner electrons rises as well. As a result, the outer electron will experience a reduced nuclear charge, which causes the electron to be further away from the nucleus and enlarges the atom.

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1. (A). All weak acids have a pH value that is higher than that of strong acids. Compared to strong acids, which dissociate completely and produce a higher concentration of H+ ions, resulting in a lower pH, weak acids partially dissociate in water, producing hydrogen ions (H+). produce a low concentration of K, leading to a high pH value.

B. All weak bases have a lower pH than strong bases. Compared to strong bases, which dissociate completely and form a higher concentration of OH- ions, weak bases receive fewer hydrogen ions from water, resulting in a lower concentration of hydroxide ions (OH-), As a result of which the pH value is reduced.

2. A. All strong acids are more acidic than weak acids in terms of pH. Compared to weak acids that only partially dissociate in water, strong acids dissociate completely, resulting in a larger concentration of H+ ions and a lower pH value.

B. All strong bases have pH values ​​that are higher than those of weak bases. Compared to weak bases that only partially take up hydrogen ions, strong bases dissociate completely in water, producing a greater concentration of OH-ions and a higher pH value.

3. Hydrochloric acid (HCl), sulfuric acid (H2SO4), and nitric acid (HNO3) are some examples of substances that are listed as strong acids with a pH of 1-2.

4. Among others, sodium hydroxide (NaOH), potassium hydroxide (KOH), and calcium hydroxide (Ca(OH)2) are examples of substances classified as strong bases with a pH of 13–14.

5. Acetic acid (CH3COOH), formic acid (HCOOH), and carbonic acid (H2CO3), among others, can be classified as weak acids with a pH range of 5–6.4.

6. Ammonia (NH3), ammonium hydroxide (NH4OH), and methylamine (CH3NH2), among other substances, can be classified as weak bases with a pH range of 7.5 to 9.

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The definition of astronomic bodies are indicated below with the sentences defining them.

Astronomic bodies are celestial objects that occur naturally in space.

Here are their definitions below:


a. Supernova exhibits strong gravitational pull such that no light can escape

b. A nebula a large cloud of gas or dust in space.

c. A white dwarf is what a medium-mass star becomes at the end of it's life.

d. Protostar is the earliest stage of a star's life.

e. Black dwarf is a star left at the core of a planetary nebula.

f. Neutron stars are the remains of a high mass star.

g. A supernova is what occurs when a red supergiant star explodes.

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In the experiment to measure the heat absorbed by a material placed in

the Sun, we have;

The possible experiment is with regards to the factors that influence energy from the Sun

The factors investigated are;

The type of material and the angle of lighting (insulation) affects the absorption of heat

The independent variable is the variable that is the cause of the effect

measured in the experiment.

It is the variable that the researcher has control over or controls and

varies during the experiment to produce the measured effect.

In the above experiment, the independent variable are either ;

The dependent variable is the variable that is under test or that is being measured.

The controlled variable is the variable that remains the same or is held

constant during the experiment and can be used as reference to

compare the dependent variable.

In the experiment, the controlled variable are either;

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Answer:

angle of light

temperature of material

type of material

Explanation:

E d g e 22 !

Hydrogen bonds can only be created by the hydrogen atom that is bound to the oxygen atom. Between the atoms of hydrogen and carbon, no dipole exists.

Water and ethanol form weak hydrogen bonds with aromatic hydrogen atoms and strong hydrogen bonds with the hydroxyl, carbonyl, and ether groups in chrysin/galangin. Chrysin and galangin interact more strongly with H2O than CH3CH2OH, with the exception of the structures A and B.

It has been discovered that hydrogen bonds between ethanol molecules and lipid phosphate oxygen atoms can be formed and can be as strong as hydrogen bonds between lipid phosphate oxygen atoms and water molecules.

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We need ti find how many elements there are in the first period and what are these.

To know what is the first period we must use that

Seeing the periodic table, the first row has two elements.

We can see that these elements are H ( hydrogen ) and He ( helium ).

ANSWER:

Firs period in the periodic table has two elements and they are called hydrogen and helium.

The balanced chemical equation for the reaction between hydrazine and oxygen shows that one mole of N2H4 reacts with one mole of O2 to produce one mole of N2 and two moles of H2O.

\(N2H4(l) + O2(g) → N2(g) + 2H2O(g)\).

Therefore, if 6 moles of hydrazine react with an excess of oxygen, we can determine the amount of water produced as follows: 6 moles

\(N2H4 x (2 moles H2O / 1 mole N2H4) = 12 moles H2O\).

Therefore, the answer is 12 moles of water will be produced when 6 moles of hydrazine reacts with an excess of oxygen.

\(N2H4(l) + O2(g) → N2(g) + 2H2O(g)\)

From the equation, we see that for every 1 mole of hydrazine that reacts, 2 moles of water are produced. Therefore, if 6 moles of hydrazine react, we can expect the production of:  \(2 x 6 = 12\) moles of water  Therefore, the answer is option (d) 12.0 mol H2O.

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Answer:

B: atomic mass subtracted from the atomic number.

Explanation:

In order to calculate the number of neutrons an element has, one must take the atomic mass for the element and subtract it from the atomic number.

The most beneficial towards maintaining the equilibrium in an ecosystem over a long period of time is to Diversity of organism.

A ecosystem maintains equilibrium by ensuring that each organism has resources and proper living condition fort the survival.  four factors balance an ecosystem is water cycle, mineral cycle, energy flow and community dynamics. An ecosystem is place where plants and other organism interact with nonliving factor like weather.

Biodiversity or biological diversity , refers to all the variety of life that exist on earth. our planet is full of variety of living organisms .An ecosystem must have the greatest amount of producers, followed by primary consumers and having smallest no. of tertiary consumers.

hence,The most beneficial towards maintaining the equilibrium in an ecosystem over a long period of time is to Diversity of organism.

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Taking into account the room temperature and pressure, there are 0.4167 moles in 10 dm³ of sulfur dioxide gas.

RTP refers to Room Temperature and Pressure. Pressure is 1 atm and Temperature is 298K. In this case, one mole of any gas has a volume of 24 dm³ or 24,000 cm³. This volume is called the molar volume of a gas.

In other words, the molar volume (the amount of space occupied by one mole) of any gas is 24dm³ (1 mol of gas molecules occupies 24.0 dm³).

Therefore, the amount of volume occupied by any gas can be calculated by multiplying the number of moles of gas by 24dm³:

Volume = Moles of gas× 24 dm³

So, the number of moles can be calculated as:

Moles of gas= Volume÷ 24 dm³

In this case, you know that volume if sulfur dioxide gas is 10 dm³. So, replacing:

Moles of gas= 10 dm³ ÷ 24 dm³

Solving:

Moles of gas= 0.4167

Finally, there are 0.4167 moles in 10 dm³ of sulfur dioxide gas.

Learn more about Room Temperature and Pressure:

Answer:

Covalent compounds have bonds where electrons are shared between atoms. Due to the sharing of electrons, they exhibit characteristic physical properties that include lower melting points and electrical conductivity compared to ionic compounds.

Explanation:

Answer:

4.97 moles

Explanation:

There are  6.022*10^23 calcium  atoms  in 1 mole of  Ca

2.99*10^24/6.022*10^23

=4.97 moles

Answer:

4.97 mol

Explanation:

Given data:

Number of atoms of Ca = 2.99×10²⁴

Number of moles of Ca = ?

Solution:

The given problem will solve by using Avogadro number.

It is the number of atoms , ions and molecules in one gram atom of element, one gram molecules of compound and one gram ions of a substance.  The number 6.022 × 10²³ is called Avogadro number.

1 mole = 6.022 × 10²³ atoms

2.99×10²⁴  atoms × 1 mol  / 6.022 × 10²³ atoms

0.497×10¹ mol

4.97 mol

The chemist has 642.4 millimoles of barium acetate in the solution.

To calculate the millimoles of barium acetate (Ba(C₂H₃O₂)₂) in the solution, we can use the formula:

moles = molarity × volume (in liters)

First, let's convert the volume from milliliters (mL) to liters (L):

440.0 mL ÷ 1000 = 0.440 L

Now we can substitute the given values into the formula:

moles = 1.46 M × 0.440 L

moles = 0.6424 mol (rounded to 4 decimal places)

To convert the moles to millimoles, we multiply by 1000:

millimoles = 0.6424 mol × 1000

millimoles = 642.4 mmol (rounded to 3 significant digits)

Therefore, the chemist has 642.4 millimoles of barium acetate in the solution.

It's important to note that the molarity (M) represents the number of moles of solute per liter of solution. By multiplying the molarity by the volume in liters, we can find the number of moles of solute. To convert moles to millimoles, we multiply by 1000. The result represents the millimoles of barium acetate present in the given volume of solution.

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Answer:

3.56

Explanation: