When any reversible reaction is at equilibrium, what conditions are necessarily true?.

Answer:

NH4+ + H2O ==> NH3 + H3O+

Explanation:

Ammonium bromide, NH4Br, is the ammonium salt of hydrobromic acid. The chemical crystallizes in colorless prisms, possessing a saline taste; it sublimes on heating and is easily soluble in water.

Answer:

Answer is: mass.

Explanation:

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Chlorophyta is another name for green algae.

Green algae is a large and diverse group of photosynthetic organisms that are typically green in color due to the presence of chlorophyll. They are found in a variety of habitats, including freshwater, saltwater, and moist terrestrial environments.

Chlorophyta is a phylum of green algae, which are photosynthetic eukaryotic organisms. They are commonly found in freshwater, but can also be found in marine and terrestrial habitats.

Chlorophyta are characterized by their green pigmentation due to the presence of chlorophyll a and b, as well as other accessory pigments.

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Answer:Chlorophyta

Explanation:

Answer: See below

Explanation:

[tex]\mathrm{At \ constant \ pressure \ the \ heat \ generated \ and \ change \ in \ enthalpy \ are \ equal:} \\\begin{aligned}Q &=\Delta H=n C_{p} \Delta T \\&=2 \times(37.11)(277-250) \\&=2003.94 \mathrm{~J} \\Q &=\Delta H=2.0 \times 10^{3} \mathrm{~J}\end{aligned}[/tex]

[tex]\mathrm{Calculate \ the \ change \ in \ internal \ energy:} \\$$\begin{aligned}\Delta H &=\Delta U+\Delta(P V) \\\Delta U &=\Delta H-n R \Delta T \\&=(2003.94)-(2 \times 8.314 \times(277-250)) \\&=(2003.94)-(448.96) \\\Delta U &=1554.98 \mathrm{~J}\end{aligned}[/tex]

Answer:

Explanation:

T1 = 505 K

P1 = 105.3 kPa = 1.04 atm

V1 = 0.250 L

T2 = 495 K

P2 = 100.3 kPa = 0.990 atm

V2 = ?

495 x 1.04 x 0.250 ÷ 505 ÷ 0.990 = V2

V2 = 0.257 L

So 0.257 L is the answer!!

Answer:

weight, mass

Explanation:

Gravity affects the weight of an object but not its mass. Your body's weight can change on different planets, but your mass will ALWAYS stay the same.

Answer:

Gravity affects the weight of an object but not its mass.

Explanation: plato :3

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Answer:

paano po yan wala po akong naintindihan sendan niyo po ako ng pic

Answer:

The mass of aluminum is 124.72 g

Explanation:

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is the amount of energy that causes a change in the temperature of a substance. In other words, sensible heat is that heat that causes the temperature of an object to vary without affecting its molecular structure and therefore its physical state. Its mathematical expression is:

Q = c * m * ΔT

where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c and where ΔT is the variation in temperature.

In this case:

Replacing:

900 J= 0.902 [tex]\frac{J}{g*K}[/tex] *m* 8 °K

900 J= 7.216 [tex]\frac{J}{g}[/tex] *m

[tex]\frac{900 J}{7.216\frac{J}{g} } =m[/tex]

124.72 g=m

The mass of aluminum is 124.72 g

Answer:

A, C, and D!

Explanation:

The  items that are true concerning a typical "thermos bottle" are Radiation is hindered by the silver coatings, conduction losses are prevented by the vacuum, and the glass walls will not conduct heat. These are the options A, C, and E.

Radiation is significant as it is the movement of heat energy from one place to another and plays a significant role in heat transfer as here in the thermos bottle, the silver coatings on the outside of the bottle help to prevent heat loss due to radiation, and the reflective portions further aid in such a process.

Hence, the items that are true concerning a typical "thermos bottle" are Radiation is hindered by the silver coatings, conduction losses are prevented by the vacuum, and the glass walls will not conduct heat. These are the options A, C, and E.

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Now

[tex]\\ \sf\longrightarrow pH=-log[H^+][/tex]

[tex]\\ \sf\longrightarrow pH=-log10^{-2}[/tex]

[tex]\\ \sf\longrightarrow pH=2[/tex]

Answer:  29.6 milliliters

Answer:

4.1 ml

Explanation:

Answer:

Sex-linked recessive

Explanation:

Male's have a higher chance of getting it than female's just like red-green color blindness.

Answer:

A.

Explanation:

Answer:

brainliest plls

Explanation: The volume of an ideal gas at standard temperature and pressure: 22.414 liters.

Answer:

5.27

Explanation:

The empirical formula for a aluminum compound containing oxygen (AlxOy), if 4.78g of Al reacts is Al3O2.

According to this question, 4.78g of Al reacts with oxygen to form a total mass of 6.67g. This means that the mass of oxygen that reacted is 6.67 - 4.78 = 1.89g

First, we convert each mass to moles

Next, we divide each value by the smallest

Multiply each value by 2

Al = 2.8 = 3

O = 2

Therefore, the empirical formula for a aluminum compound containing oxygen (AlxOy), if 4.78g of Al reacts is Al3O2.

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If 32.2 g of ethyl alcohol is dissolved in 0.50 L water to make a solution, the molarity of the solution will be 1.398 mol/L or 1.398 M

The molarity of a solution is the ratio of the number of moles of solutes and that of the volume of solvent in the solution.

Mathematically:

Molarity = number of moles/volume in L

Number of moles of 32.2 g ethyl alcohol = mass/molar mass

                             = 32.2/46.07 = 0.699 moles

Molarity of the solution = 0.699/0.50

                                         = 1.398 mol/L or 1.398 M

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Answer:

Heterogeneous mixture

Explanation:

A homogeneous mixture is defined as a mixture in which the constituents of the mixture are uniformly distributed. A typical example of a homogeneous mixture is when a salt is dissolved in water.

A heterogeneous mixture refers to a kind of mixture whereby the composition of the mixture is not uniform. A typically example of a heterogeneous mixture is non-homogenized milk.

Since non-homogenized milk is not homogeneous, the cream rises to the top and separates from the rest of the mixture because the emulsion has not been stabilized. However, homogenized milk is just milk whose emulsion has been stabilized the cream does not separate when left to stand.

Answer:

Slime.

Once upon a time, slime was part of the fungi kingdom. Now it's not, according to experts.

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Answer:

not going to lie... i suck at science

Explanation:

sorry

when electric current is passed through an electrolytic cell we can recognise that electrolysis is taking place by :

*there may bubbles of different gases formed on the electrodes.

*if we add vinegar or lime juice we find more bubbles forming

by the we can identify

Answer:

These air pollutants consist of...

Answer:

2 oxygen atoms make oxygen gas

A molecule of oxygen gas is composed of two oxygen atoms chemically bonded together. The symbol for oxygen is "O," and the atomic number is 8, indicating that each oxygen atom has 8 protons in its nucleus.

A covalent bond is a type of chemical bond that occurs between two atoms when they share one or more pairs of electrons. It is a strong bond that holds atoms together to form molecules.

In a covalent bond, atoms share electrons in order to achieve a more stable electron configuration, typically by filling their outermost energy levels (valence shells). By sharing electrons, both atoms involved in the bond can achieve a more stable configuration, similar to the noble gas configuration.

In an oxygen gas molecule, the two oxygen atoms are held together by a covalent bond. Covalent bonds involve the sharing of electron pairs between atoms. In the case of oxygen gas, each oxygen atom shares two electrons with the other oxygen atom, resulting in a stable molecule.

Therefore, a molecule of oxygen gas is made up of two oxygen atoms (O) bonded together by a covalent bond.

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Answer:

muscular jumping leg (helps them escape predators, chase after prey), webbed foot (helps them live in both aquatic and land environments), and they can store poison (that is used to attack or defend) in their glands

Explanation:

:)

[tex]density \: = \frac{mass}{volume} [/tex]

mass = 12.3 × 25

= 307.5

approximately = 308 g

Answer:

1. Elements named after Countries or Places

Americium

Am

Made in 1945 at Chicago USA

Berkelium

Bk

Made in 1950 at the University of California, Berkeley, USA

Californium

Cf

Made in 1950 at the University of California, Berkeley, USA

Copper

Cu

The Romans were the biggest users of copper. Their source of copper was the island of Cyprus. Their name for the island was "Cyprium". They called the metal "Aes Cyprium" - metal of Cyprus. The name became shortened to Cyprium which then became "Cuprum" from which copper gains its modern day symbol.

Francium

Fr

Discovered in 1939 at the Curie Institute, Paris, France.

Gallium

Ga

Named after the Latin name for France - Gallia

Germanium

Ge

Discovered in 1886 by a German Chemist - Winkler.

Polonium

Po

Discovered in 1898 by Marie Curie, who was Polish.

Scandium

Sc

Discovered and mined in Scandinavia

Strontium

Sr

Named after Strontian, a small village in the Western Highlands of Scotland.

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4. Elements named after Planets

Helium

He

From the Greek word "Helios" - the Sun. In 1868 during an eclipse of the Sun, Scientists observed a spectral line caused by an unknown element. They named the element Helium. Twenty seven years later in 1895, the element was discovered on Earth.

Neptunium

Np

Named after the planet Neptune. Find the position of the three planets Neptune, Pluto, and Uranus in the Solar system. Now find the position in the Periodic Table of the three elements named after these planets...

Plutonium

Pu

Named after the planet Pluto

Uranium

U

Named after the planet Uranus. The element was discovered in 1789, shortly after the discovery of the planet.

Elements named from Mythology

Tantalum

Ta

Named after the Greek mythological king, Tantalus. It was discovered in 1802 and great difficulties were encountered in dissolving its oxide in acid to form salts. It proved to be a tantalizing problem!

Niobium

Nb

Named after Princess Niobe, the daughter of King Tantalus. According to legend, father and daughter were always found together and were very much alike. The two elements Niobium and Tantalum are usually found together in nature and their properties are very similar. Niobium was discovered in North America in 1801 and was originally named Columbium. It was renamed in 1844 after the connections with tantalum was realized. Find the positions of both elements in the periodic table

Thorium

Th

Named after Thor, the Scandinavian God of War and Thunder. It was discovered and named in 1828. Coincidentally, thorium is used today as a nuclear fuel in nuclear weapons and reactors.

Titanium

Ti

Named after Titans, the Greek supermen. Titanium is an extremely strong metal which resists attack by acids.

Vanadium

V

Named after Vandis, the Scandinavian Goddess of Beauty. The salts of vanadium have beautiful colors.

3. Elements named after Famous Scientists

Curium

Cm

Made in 1944 at Chicago. It was named in honor of Marie and Pierre Curie.

Einsteinium

Es

Made in 1952 at the University of California. It was named in honor of Albert Einstein.

Lawrencium

Lw

All of the man-made elements have been made as a result of the Nuclear Age. The majority of these elements were made at the University of California USA, in a machine called the Cyclotron. The Cyclotron was invented by Professor Ernest Lawrence. Lawrencium was made at the University of California in 1961 and named in his honor.

Mendelevium

Md

Made in 1955 at the University of California. It was named after a world famous Russian Chemist Dimitri Mendeleev.

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8. The chemical symbol for lead is Pb, which comes from the Latin word plumbum, meaning "waterworks," referring back to ancient times when the metal was widely used in the construction of water pipes.

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