Plsss help this midterm ends 12.30
A piece of indium with a mass of 21.93 g is submerged in 46.3 cm3 of water in a graduated cylinder. The water level increases to 49.3 cm3. The correct value for the density of indium measured in g/cm3 from these data is:

Answer:

zero order reaction

Explanation:

The seem to be a reaction is zero order as the data only fits to zero order integrated rate law.

Integrated rate law:

[A] = [A]_0 – kt

Here y = [ A] and slope is -k , so when we plot concentration of A with respect to t then we get the equation in the form of line

y = mx + c

So the answer Zero order in [A]

The pH of the solution is 9.56.

Given:

Mol of NH₃ = 0.50

Mol of [tex]NH_4^+[/tex] = 0.20 to start (NH₄Cl dissolves completely)

Molarity = 1.0 M

30.0 mL of 1.0 M HCl is 0.0300 mol of HCl.

This will react with the NH₃ to produced 0.030 mol of [tex]NH_4^+[/tex] .

This equation is used to calculate pH. It is an approximate equation that shows the relationship between the pH or pOH of a solution and the pKa or pKb and the ratio of the concentrations of the dissociated chemical species

pH = pKa + log(base/acid)

pKa = 14 - pKb

pKa= 14 - 4.75

pKa= 9.25

pH = 9.25 + log(0.47/0.23)

pH = 9.56

Thus, the pH of the solution is 9.56.

Find more information about pH here:

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The molecules or coefficient of N2 would be 1, that of H2 would 3, and that of NH3 would be 2.

From the balanced equation of the reaction:

[tex]N_2 + 3H_2 ---> 2NH_3[/tex]

1 mole of N2 will react with 3 moles of H2 in order to produce 2 moles of NH3. In order words, the mole ratio of N2 to H2 to NH3 in the reaction will always be 1:3:2.

Thus, the coefficient of N2 in the equation will be 1, the coefficient of H2 will be 3, and the coefficient of NH3 will be 2.

More on balancing equations can be found here: https://brainly.com/question/7181548?referrer=searchResults

Answer: 3:2

this is the answer I came up with that was correct after I did the question in ck12

Answer:

When limestone is heated strongly, the calcium carbonate it contains absorbs heat (endothermic ) and decomposes to form calcium oxide. Calcium oxide (also known as quicklime) is a key ingredient in the making of cement and is also used to make certain types of plaster.

Explanation:

Limestone heated

When limestone is heated strongly, the calcium carbonate it contains absorbs heat (endothermic ) and decomposes to form calcium oxide. ... Calcium oxide (also known as quicklime) is a key ingredient in the making of cement and is also used to make certain types of plaster.

Burning Limestone

Burning limestone, which is calcium carbonate, gives you quick lime, calcium oxide. Mixed with water this produces slaked lime, calcium hydroxide. ... This is soft when first mixed, but with time absorbs carbon dioxide from the atmosphere and hardens as it reverts back to calcium limestone.

Limestone exposed to heat and pressure.

Marble is a metamorphic rock that forms when limestone is subjected to the heat and pressure of metamorphism. ... Under the conditions of metamorphism, the calcite in the limestone recrystallizes to form a rock that is a mass of interlocking calcite crystals.

Answer:

62.00

Explanation:

H2 means that there are two moles of hydrogen so multiply the atomic mass by two (1.01 × 2 = 2.02)

C only has one mole sp leave 12.01 alone

And multiply oxygen by 3 because there are three moles of oxygen (15.99 × 3 = 47.97)

Add them all together!

2.02 + 12.01 + 47.97 = 62.00 for molar mass

Answer:

false

Explanation:

Answer:

True

Explanation:

they can get up to several hundreds of feet.

Answer:

C: The C horizon is a subsurface horizon. It is the least weathered horizon. Also known as the saprolite, it is unconsolidated, loose parent material. The master horizons may be followed by a subscript to make further distinctions between differences within one master horizon.

Explanation:

Answer:

1)Energy converter is the transformation of one form of energy into another form .It is more specifically that the term energy conversions refers to the process through which energy is changed into forms that are useful to humans .For 100 of years humans have used an array of devices and systems for this purpose.

2) The three energy converters that you or your family use regularly are

3)The three kinds of power plants that produce electricity in Ontario are

4)A power plant is an industrial facility that generates electricity from primary energy most of the power plants use one more generators that convert mechanical energy into electrical energy in order to supply power to the electrical grid for society's electrical needs.

may be this was ur answer for ur question u wanted

Answer:

Molar mass of Al2O3 = 101.961276 g/mol

This compound is also known as Aluminium Oxide.

Convert grams Al2O3 to moles or moles Al2O3 to grams

Molecular weight calculation:

26.981538*2 + 15.9994*3

Percent composition by element

Element Symbol Atomic Mass # of Atoms Mass Percent

Aluminium Al 26.981538 2 52.925%

Oxygen O 15.9994 3 47.075%

Explanation:

Percent composition by element

Element Symbol Mass Percent

Aluminium Al 52.925%

Oxygen O 47.075%

Answer:

There is strong attraction or repulsion between the gas particles.In other words,they strongly interact with each other" is NOT an assumption made by kinetic molecular theory.

The theory that attempts to elucidate the behaviour of gases is known as kinetic molecular theory.

The postulates of kinetic molecular theory of gases are given below,

\bigstarGases consist of large number of identical particles(atoms or moleculesthat are so small and so far apart

\bigstar There is no force of attraction between the particles of a gas at ordinary temperature and pressure

\bigstarParticles of a gas are always in constant and random motion

\bigstarParticles of a gas move in all possible directions in straight lines. During their random motion, they       collide with each other and with the walls of the container

\bigstarCollisions of gas molecules are perfectly elastic. This means that total energy of molecules before and       after the collision remains same

\bigstarThe average kinetic energy (energy due to motion) of the gas particles is proportional to the temperature    measured in kelvin. As temperature increases, the particles move faster and have more energy

\bigstarAt any particular time, different particles in the gas have different speeds and hence different kinetic        energies.

\therefore From the above data it is clear that "There is strong attraction or repulsion between the gas particles.In other words,they strongly interact with each other" is NOT an assumption made by kinetic molecular theory.

Explanation:

According to Kinetic theory of gases, the kinetic energy of particles are derived from the temperature and not by their mass and velocity. Hence, option a is not an assumption of kinetic theory of gases.

According to kinetic theory of gases, gases substances are made of tiny particles. These particles when taken in a container have negligible volume compared to the volume of the container.

The collision between the gaseous particles and and between the particles and the wall make the pressure within the container. The kinetic energy of the particles is directly proportional to the temperature of the gas.

According to the theory, the kinetic energy is not determined from the mass and velocity of the particles, but by the temperature of the system. Hence, option a is not an assumption of kinetic molecular theory of gases.

Find more on kinetic theory:

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Answer:

106g/mol

Explanation:

Mass of Na=2×23=46

Mass of C=12

Mass of O=3×16=48

Total mass of Na2CO3=106g/mol

Answer:

Japan, China, the U.S., Indonesia, Chinese Taipei and South Korea have been named by Pew Charitable Trusts on a “shame list” of countries responsible for overfishing tuna in the Pacific. According to Pew, the “Pacific 6” are responsible for 80 percent — 111,482 metric tons in 2011 — of the annual catch of bigeye tuna.

Hope it will help you

Answer:

Salmonella

Poultry

Explanation:

I'm a cook. :D

Answer:

just put random words thats what i always do i never got a grade lower than c

Answer:

[tex]^A_ZX[/tex] is the notion of an atom 'X', if the mass number is A and the atomic number is Z

Explanation:

The symbol of the element is "X"

The notion comprises of symbol of element "X" in the center.

On the upper left side of the symbol mass number "A" is kept and on the lower left side of the symbol, atomic number "Z" is kept.

Thus, notion will be

[tex]^A_ZX[/tex]

Answer:

gravity

Explanation:

Answer:

1. Ok, so you have a 1:1 ratio of FeCl2 to FeCl3, which is shown by the fact that if you react 2 moles of FeCl2 you get 2 moles of FeCl3. So therefore, if you react 4 moles of FeCl2, you'd form 4 moles of FeCl3.

2. You have a 1:2 ratio of Cl2 to FeCl2, for every 1 mole of Cl2, you need 2 moles of FeCl2, so therefore, for 7 moles of Cl2, you need 2x7moles = 14 moles

3. 1:1 ratio. So you start with 2.28moles.

4. 1:2 ratio of Cl2 to FeCl2, so therefore to get from FeCl2 to Cl2 you need to divide by 2. Therefore, you need 3.25moles / 2 = 1.625 moles

Explanation:

pls mark branliest

Answer:

Individual Characteristics are properties of physical evidence that can be attributed to a common source with a high degree of certainty. Examples of individual evidence include anything that contains nuclear DNA, toolmarks, and fingerprints.

Explanation:

Answer:

covalent

Explanation:

covalent compounds contain non metals.  All of the elements in Octocrylene are non metals

Answer:

the remaining books weigh 4 kilograms or 4000 grams

Answer:

Physical

Explanation:

Hope this helps :)

Explanation:

As you know, electrons are always moving. They spin very quickly around the nucleus of an atom. As the electrons zip around, they can move in any direction, as long as they stay in their shell. Any direction you can imagine — upwards, downwards, or sidewards — electrons can do it. Electrons are constantly spinning in those atomic shells and those shells, or orbitals, are specific distances from the nucleus. If you are an electron in the first shell, you are always closer to the nucleus than the electrons in the second shell.

Answer:

Electrons

Explanation:

Electrons orbit around the nucleus.

Water is a chemical compound also known as H2O and is composed of two hydrogen atoms (H) and one oxygen atom (O).

2 H2O → 2 H2 + O.

Answer:

Hi, valence electrons are the number of electrons present in the outermost shells of atoms of elements, they affect how sharing or transfer of electrons takes place when the atoms go into any reaction.

they also determine the oxidation state of the atom.

for example, hydrogen has one electron in its outermost shell. therefore in any reactions it tends to loose that electron or gain one more to become stable.

the reason why elements go into reactions is to become stable (to have a complete duplet or octet structure).

As you know, each shells aside from the first has maximum of 8 electrons. so for a element like chlorine which have 7 electrons in the valence shell will gain one electrons in reactions to become stable(have a complete octet structure)

valence electrons also classifies elements( metal or non-metal)

if an element have 1, 2 or 3 valence electron(s), it is likely to be a metal

if an element have 4 or 5, it can be a non-metal or a metalliod (semiconductor)

if an element have 6 or 7, it is likely to be a non-metal

if an element have 8, it is a noble/inert gas

this also explains why noble gases do not react since they already have a duplet structure, they do not need to go into reaction.

good lucks on your exams.

Answer:

The number of electrons in an atom's outermost valence shell governs its chemical properties. ... This tendency is called the octet rule, because the atoms have eight valence electrons. METALS. The most reactive metallic elements are metals from Group 1 (e.g., Na or K ) or Group 2 (e.g., Mg or Ca )

hope this helps.