What is the number 98.907 called? *
1 point
43
Тc
Technetium
98.907
atomic number
atomic mass
element symbol
element name

Answer:

The most important thing to remember about ionic compounds is that they must be electrically neutral, i.e. the overall charge of a formula unit must be zero.

Ionic compounds are formed when cations, which are positively charged ions, form ionic bonds with anions, which are negatively charged ions.

The cations and anions are held together by the very powerful electrostatic force of attraction that exists between the opposite charges.

In your case, you know that the cation has a

4

+

positive charge and that the anion has a

1

−

negative charge.

In order for an ionic compound to form, you need the overall negative charge coming from the anions to balance out the overall positive charge coming from the cation.

In order to achieve that balance, you need to have four anions for every one cation, since

4

×

(

1

−

)

=

4

−

will balance out the

4

+

charge of the cation. This means that one formula unit of this ionic compound will contain one

Mn

4

+

cation and four

Br

−

anions

Mn

4

+

Br

1

−

⇒

Mn

1

Br

4

⇒

MnBr

4

As you can see, one way to remember this is that the charge of the cation becomes the subscript of the anion and vice versa - this is known as the crisscross method.

The name of the compound will be manganese(IV) bromide. The Roman numeral is used here because manganese can have multiple oxidation states.

Explanation:

mr freeze

The name of the given ionic compound [tex]\rm MnBr_4[/tex] is named manganese(IV) bromide.

Ionic compounds are chemical compounds that are formed by the electrostatic attraction between oppositely charged ions.

To determine the name of this compound, we need to follow the naming rules for ionic compounds.

In conclusion, the ionic compound [tex]\rm MnBr_4[/tex] is named manganese(IV) bromide.

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Answer:

2,1,1,1

Explanation:

4,2,2,2 (simplify)

Answer:

without fission reactions you wouldn't react, and we need to react

Explanation:

Answer:

K < Fe < Br < Kr

Explanation:

Given chemical elements;

      Potassium

      Iron

      Bromine

      Krypton

Problem; arrange in order of increasing electronegativity

Solution:

The electronegativity of an element measures the relative tendency with which the atoms of the element attracts valence electrons in the chemical bond.

 To solve this problem, we are going to use values of electronegativity from the Pauling's electronegativity table of elements;

       For;

            Potassium  = 0.8

            Iron = 1.83

            Bromine  = 2.8

            Krypton = 3.0

So;

  K < Fe < Br < Kr

Answer:

Explanation:

Solar cell, Although there are many types of energy, the most efficient forms are renewable: hydro-thermal, tidal, wind, and solar. Solar energy has been proven to be the most efficient and effective among renewable energy sources for home and commercial use.

When it comes to surviving in the wild, campers and hikers also often depend on some sort of portable backup power source. Solar energy is one of the best backup power sources for emergency situations.

Human powered generators are the best energy source for the rescue team as it doesn't require any lengthy time consuming resource but only the power of single human being. Just like fossil fuels, the human power is a kind of renewable energy source that does no harm to the environment and can be used whenever required.

Answer: True

Explanation:

I did the ck-12 quiz

Answer: Temperature of a substance does not change during a phase change. Energy gained after the the solid melts increases the average kinetic energy or the temperature. Freezing. When liquid is freezing the energy flows out the the liquid.

Explanation:

Answer:

Explanation:

1) When solid Calcium oxide is added to dilute hydrochloric acid

   [tex]CaO(s)+2HCl(aq)[/tex]→[tex]CaCl2(aq)+H2O(l)[/tex]

2) When solid Calcium carbonate is added to dilute Hydrochloric acid

  [tex]CaCO(s)+ HCl(aq)[/tex]→[tex]CaCl2(aq)+ H2O(l)+CO2(g)[/tex]

clearly we observe the formation of CO2 from Calcium carbonate whereas no such gas is evolved from Calcium oxide

The difference between the reaction of HCl with calcium carbonate and calcium oxide is that with calcium oxide no carbon dioxide formation takes place, while with calcium carbonate carbon dioxide formation occurs.

The dilute HCl has been the acid that reacts with the base for the formation of salt and water. The addition of calcium oxide has been the resultant of the reaction that results in the formation of calcium chloride and water. The reaction has no brisk effervescence or gas release.

The reaction of Calcium carbonate with dilute HCl results in the same reaction with the formation of calcium chloride and water. However, in the reaction, there has been the release of the bubbles of carbon- dioxide formation.

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Alligator nests made of mud and twigs is an example of qualitative data. Thus option B is correct.

There are different types of data which describe the things after assigning value to it, mandatory to organize, process, and present the information in a useful way is the aim of data analysis.

There are two major types of data used in research such as Qualitative data presented in words and descriptions, can only be observed  harder to analyze; Examples are taste, experience, texture, or opinion

Quantitative data refers to those data which can be measured and expressed in the form of numerical value, can be measured in different units; Examples are  age, rank, cost, length, weight etc.

Another data called Categorical data represents in a group form like a person responding by answering the question in a field survey.

Thus option B is correct.

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Answer:

kinetic theory of matter. when heat is added it excites the atoms and makes them vibrate.

Answer:

5mL

Explanation:

mass divided by density is equal to volume so

3.9/.78 = 5

why does this work?

grams cancel when you divide g/g/mL and you are left with just mL

First we need to find the wavelength from the frequency using [tex]C = \lambda V[/tex]

so [tex]3.0e8 = \lambda * 2.2e16 Hz[/tex] which equals 1.36e-8 m then we use the formula [tex]E =h \frac{C}{\lambda}[/tex] we plug in [tex]E = 6.63e-34 * (3.0e8/1.36e-8)[/tex] and we get [tex]E = 1.46e-17[/tex]

so the energy is 1.46 x 10^-17 J.

Answer:

A, 1.5 × 10 ^–17 J

Explanation:

edge

Answer:

where the notes

Explanation:

An earthquake (also known as a quake, tremor or temblor) is the shaking of the surface of the Earth resulting from a sudden release of energy in the Earth's lithosphere that creates seismic waves. Earthquakes can range in size from those that are so weak that they cannot be felt to those violent enough to propel objects and people into the air, and wreak destruction across entire cities. The seismic of an area is the frequency, type, and size of earthquakes experienced over a period of time.

the word earthquake is used to describe any seismic event—whether natural or caused by humans that generates seismic waves. Earthquakes are caused mostly by rupture of geological faults but also by other events such as volcanic activity, landslides, mine blasts, and nuclear tests. An earthquake's point of initial rupture is called its hypo center or focus. The epicenter is the point at ground level directly above the hypo center. Tectonic earthquakes occur anywhere in the earth where there is sufficient stored elastic strain energy to drive fracture propagation along a fault plane. The sides of a fault move past each other smoothly and aseptically only if there are no irregularities or asperities along the fault surface that increase the frictional resistance. Most fault surfaces do have such asperities, which leads to a form of stick-slip behavior. Once the fault has locked, continued relative motion between the plates leads to increasing stress and therefore, stored strain energy in the volume around the fault surface. This continues until the stress has risen sufficiently to break through the asperity, suddenly allowing sliding over the locked portion of the fault, releasing the stored energy.This energy is released as a combination of radiated elastic strain seismic waves,frictional heating of the fault surface, and cracking of the rock, thus causing an earthquake. This process of gradual build-up of strain and stress punctuated by occasional sudden earthquake failure is referred to as the elastic-rebound theory. It is estimated that only 10 percent or less of an earthquake's total energy is radiated as seismic energy. Most of the earthquake's energy is used to power the earthquake fracture growth or is converted into heat generated by friction. Therefore, earthquakes lower the Earth's available elastic potential energy and raise its temperature

There are three main types of fault, all of which may cause an inter-plate earthquake: normal, reverse , and strike-slip. Normal and reverse faulting are examples of dip-slip, where the displacement along the fault is in the direction of dip and where movement on them involves a vertical component. Normal faults occur mainly in areas where the crust is being extended such as a divergent boundary. Reverse faults occur in areas where the crust is being shortened such as at a convergent boundary. Strike-slip faults are steep structures where the two sides of the fault slip horizontally past each other; transform boundaries are a particular type of strike-slip fault. Many earthquakes are caused by movement on faults that have components of both dip-slip and strike-slip; this is known as oblique slip.

Reverse faults, particularly those along convergent plate boundaries, are associated with the most powerful earthquakes, mega thrust earthquakes, including almost all of those of magnitude 8 or more. Strike-slip faults, particularly continental transforms, can produce major earthquakes up to about magnitude 8. Earthquakes associated with normal faults are generally less than magnitude 7. For every unit increase in magnitude, there is a roughly thirty fold increase in the energy released. This is so because the energy released in an earthquake, and thus its magnitude, is proportional to the area of the fault that ruptures,and the stress drop. Therefore, the longer the length and the wider the width of the faulted area, the larger the resulting magnitude. The topmost, brittle part of the Earth's crust, and the cool slabs of the tectonic plates that are descending down into the hot mantle, are the only parts of our planet that can store elastic energy and release it in fault ruptures. Rocks hotter than about 300 °C (572 °F) flow in response to stress; they do not rupture in earthquakes.The maximum observed lengths of ruptures and mapped faults (which may break in a single rupture) are approximately 1,000 km (620 mi). Examples are the earthquakes in all in subduction zones. The longest earthquake ruptures on strike-slip faults. are about half to one third as long as the lengths along subducting plate margins, and those along normal faults are even shorter.

An exothermic process releases heat causing the temperature of the immediate surroundings to rise in endothermic process absorbs heat and cools the surroundings so exothermic process releases heat while an endothermic process absorbs heat

Answer:

See explanation

Explanation:

First of all we must remember the statement of Dalton's atomic theory that atoms can neither be created nor destroyed. Clearly, chemical reactions involves rearrangement of atoms of reactant and product molecules.

Since straw contains carbon, hydrogen, and oxygen atoms, it is obvious that there are no gold atoms in it.

If there are no gold atoms in straw, then straw can not be converted into gold by any chemical process because that implies that gold atoms are being 'created' in violation of Dalton's theory.

Answer:

2. Oxidation number

Explanation:

In an atom, M, nuclide notation is expressed as:

ₓᵃMⁿ

Where a is mass number (Protons + neutrons)

x is atomic number (Protons)

And n is the charge of the atom (Protons - Electrons ; Oxidation number)

The atom Cu²⁺ has lost 2 electrons, changing, thus, its oxidation number.

Right answer is:

Answer:

Oxidation number

Answer:

So they can communicate their results without confusion.

Explanation:

Answer:

104g

Explanation:

Based on the law of conservation of mass, the quantity of zinc produced by reacting calcium and zinc carbonate would be 104g.

The law of conservation of mass states that "in a chemical system, the mass is always conserved as matter is neither created nor destroyed but changed from one form to another".

 In short;

         Mass of products  = Mass of reactants

Mass of products  = Mass of CaCO₃ + Mass of Zn

Mass of reactants  = Mass of Ca + Mass of ZnCO₃

   So;

               152g + Mass of Zn = 64g + 192g

                           Mass of Zn  = 64g + 192g - 152g

                           Mass of Zn  = 104g

Answer:

104g

Explanation:

math + science = 104g

Answer:

How many Joules of energy do you need to melt all the ice into a pure liquid along the path from B to C on the graph? Answer: For 1 kilogram of ice ,which equals 1000 grams, we need 333 Joules/gram x 1000 grams = 333,000 Joules. Problem 3 - The Specific Heat of liquid water is 4180 Joules/kg C.

Explanation:

Answer:

wassup bro

Explanation:

It’s mid ocean ridges

Explanation: In an isotonic environment, the relative concentrations of salute and water are equal on both sides of the membrane period there is no water movement, so there is no change in the size of the cell period when a cell is placed in a hypnotic environment, water will never enter the cell and the cell will swell

Answer:

If the average kinetic energy of the particles (temperature) remains the same, the average force per particle will be the same. With more particles there will be more collisions and so a greater pressure.

Answer:

is this a question or is this to just let us have free points?

Explanation:

Answer:

(NH4)2Se

Explanation:

The  chemical formula for  compound ammonium selenide is (NH₄)₂Se.

Here's a step-by-step explanation of how we arrive at this formula:

1. Ammonium ion: The ammonium ion is represented by the formula NH₄⁺. It consists of one nitrogen atom (N) bonded to four hydrogen atoms (H).

2. Selenide ion: The selenide ion is represented by the formula Se₂⁻. It consists of one selenium atom (Se) with a charge of -2.

3. Combining the ions: To form a neutral compound, we need to balance the charges of the ions. Since the ammonium ion has a charge of +1 and the selenide ion has a charge of -2, we need two ammonium ions to balance the charge of one selenide ion.

4. Formula: Therefore, the formula for ammonium selenide is (NH₄)₂Se, indicating that two ammonium ions are required for each selenide ion.

Thus, ammonium selenide has chemical formula of (NH₄)₂Se.

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Answer:

A - 18.01

Explanation:

You add the first part of the equation, then you subtract that number by the number given from the second half of the equation.

Answer:

O The core

Explanation:

Subatomic particles include electrons, the negatively charged, almost massless particles that nevertheless account for most of the size of the atom, and they include the heavier building blocks of the small but very dense nucleus of the atom, the positively charged protons and the electrically neutral neutrons. Which therefore means that the core is NOT a subatomic particle.

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Answer:

1) Metalloids Metalloids, also called semiconductors, are the elements that border the zigzag line on the periodic table. Chemical Symbol Each square on the periodic table includes an element's name, chemical symbol, atomic number, and atomic mass.

2) Atom – the smallest particle into which an element can be divided and still be the same substance. 2. Electrons – the negatively charged particles found in all atoms.

3) Electrons are the negatively charged particles of atom. Together, all of the electrons of an atom create a negative charge that balances the positive charge of the protons in the atomic nucleus. ... The mass of an electron is almost 1,000 times smaller than the mass of a proton.

4) Carbon-13 (13C): The carbon isotope whose nucleus contains six protons and seven neutrons. This gives an atomic mass of 13 amu. six neutrons, resulting in an atomic mass of 12 amu.

5) Atoms are constructed of two types of elementary particles: electrons and quarks. Electrons occupy a space that surrounds an atom's nucleus. Each electron has an electrical charge of -1. Quarks make up protons and neutrons, which, in turn, make up an atom's nucleus.

6) Neutrons are the particles in an atom that have a neutral charge. They aren't positive like protons. They aren't negative like electrons.

7) The current model of the atom shows an atom that is mostly empty space. In the center is a small nucleus made of protons and neutrons.

8) The mass number of an atom is equal to the number of protons plus the number of neutrons that it contains. In other words, the number of neutrons in any atom is its mass number minus its atomic number. Although all atoms of a given element must have the same atomic number, they need not all have the same mass number.

9) Mendeleev arranged the elements in order of increasing relative atomic mass . When he did this he noted that the chemical properties of the elements and their compounds showed a periodic trend .

10) Letter: C

Answer:

Molicules

Explanation:

Becuse it is