Question 15
4 pts
Using the equation:
HgO --> Hg + O2
If 7.543 grams of HgO decompose, how many grams of oxygen are formed?

Answer:

1. 1166.2

2. 2076

3. 1336. 8

4. 733.04

5. 1834.5

6. 556.6

7. - 410.6

8. 836.4

Explanation:

1.9 x 103 =928

Answer:Physical changes involve states of matter and energy. No new substance is created during a physical change, although the matter takes a different form. The size, shape, and color of matter may change. Physical changes occur when substances are mixed but don't chemically react.

Explanation:

Given to us is the Reaction of Aluminium metal with Chlorine gas . That is ,

[tex]\boxed{\red{\bf \underset{\blue{Aluminium}}{2Al(s)}+\underset{\blue{Chlorine}}{3Cl_2(g)}\longrightarrow \underset{\blue{Aluminium\: chloride}}{2AlCl_3}}}[/tex]

Now Mass of 1 mole aluminium = 27g . So mass of 2 moles of it would be 27×2 g = 54g .

Also , Mass of 1 mole of chlorine gas = 35.5 g . So mass of 2 Atoms will be 71g . And mass of 3 moles of atom will be 71 × 3g = 213g .

Now , use unitary method ;

213 g of Chlorine reacts with 54g of Aluminium.

1 g of Chlorine will react with [tex]\sf\dfrac{54g}{213g}[/tex] of Aluminium.

Hence 52.9 g of Chlorine will react with [tex]\sf \dfrac{54}{213}\times52.9g[/tex]=[tex]\bf 13.41g[/tex] of Aluminium.

Answer:

A population is a group of organisms belonging to the same species that live in the same area and interact with one another.

Explanation:

Levels of Ecological Organization

Level # 2. Population:

Level # 3. Community:

Level # 4. Ecosystem:

Level # 5. Biome:

Level # 6. Biosphere:

Answer:

A  consumer is an organism that eats other organisms to gain energy; it is also called  a heterotroph.

A  producer is an organism that makes its own food; it is also called  an autotroph.

A  decomposer is an organism that breaks down waste and dead organisms.

Explanation:

Green plants are examples of autotrophs that make their own food by photosynthesis - they don't rely on other organisms to provide them with energy.

In contrast, many organisms rely on other organisms as an energy source. These organisms are called consumers or heterotrophs. They consume producers and other consumers.

Decomposers such as some fungi, bacteria, and certain insects break down dead or decaying biological material and recycle the nutrients back into the soil.  

Answer:consumer a heterotroph producer an autotroph decomposer

Explanation:

Answer:

Photosynthesis in plants converts solar energy into chemical energy using electrons and protons from water. ... In the energy-transduction reactions, solar energy is converted into chemical energy in the form of two energy-transporting molecules, ATP and NADPH.

Answer:

light energy to chemical energy :]

Explanation:

Answer:

It indicates phase changes: melting then  later boiling.

Explanation:

On the heating curve of water, the plateau marks phase change transitions.The temperature remains constant during this period.The first phase change is melting of water.The second phase change is boiling of water to gas.

Answer:

Explanation:

The charge on the ion is 24 protons - 22 electrons = 2+

The element is Chromium (number 24 on the periodic table).

Cr^2+

Answer: neutral

Explanation: An atom is made up of three major sub-atomic particles namely protons, electrons and neutrons. The electrons form a cloud around the nucleus and are bound to the nucleus by electromagnetic forces.

Answer:

Depends on if the atoms have the same amount of atomic mass and if they have the same amount of ions, or none at all.

Explanation:

They can be the same atom, but if they don't have the same amount of protons, electrons, and neutrons, they aren't identical.

Answer:

I believe that in H-C≡N, Nitrogen has 4 bonding electrons and 2 non-bonding electrons.

(:

Explanation:

Answer:

D. potential energy

Explanation:

Answer:

bill gates

Explanation:

Answer:

Explanation:

Well ik its not math for this but for the first one if u add

22+22+13+1 u get 58

then second one 1+22+22+2=47

1+22+22+24+1=70

1+22+22+13+1=59

U notice how that most or some are all going up to 50 except the third one

So that means its 1s22s22p24s1

The longest wavelength is required for the excited state, 1s22s22p13s1.

According to the Bohr model, an atom absorbs energy and moves from a lower energy level to a higher energy level. Also energy is emitted when an electron moves from a higher to a lower energy level.

The lowest energy state of an atom is called the ground state. The excited state is a higher energy level. The smaller the energy difference between the energy levels, the longer the wavelength required for the transition.

Hence, the longest wavelength is required for the excited state, 1s22s22p13s1.

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Answer:

R=0.0564g K2SO4

Answer:

4.5 g/cm^3

Explanation:

use formula d=m/v

45/10

d= 4.5 g/cm^3

Answer:

i feel like the answer is A

Answer: Nickel has one more proton.

Explanation:

The Periodic table orders elements based on their atomic number not by their atomic mass even though this order usually coincides with the atomic masses of the elements. Occasionally however, this is not the case as is proven by Cobalt and Nickel.

The atomic number of an element refers to the number of protons that the element has in its nucleus. Cobalt has 27 protons whilst Nickel has one more proton at 28 which is why it comes after Cobalt.

Answer:

lower density

Explanation:

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of gas = 500 mL

density = 0.88 g/mL

We have

mass = 0.88 × 500

We have the final answer as

Hope this helps you

Answer:

kg, m^3, kg/m^3

Explanation:

the SI units for these are:

mass: kilogram

volume: cubic meter

density: kilogram per cubic meter

Answer:

Explanation:

The appearance of the surface of a mineral when it reflects light is known as

Answer:

a heterogeneous mixture

Explanation:

an example would be sand and water because it can be filtered which is a physical mean of separation.

Answer:

Heterogeneous mixtures

Explanation:

It is composed of two or more types of matter that can be present in varying amounts and can be separated by physical means. Heterogeneous mixtures vary in composition from point to point; homogeneous mixtures have the same composition from point to point.

Answer:

Explanation:

moles

bonding

balancing equations

and set ups

Answer:

b is the answer

Explanation:

non metals are not shiny, brittle, unmalleable, and are poor conductors of thermal energy and electrical current.

A nonmetal is brittle, dull, and low in density.  

• Non-metals refer to the elements that produce negative ions by gaining or accepting electrons. The non-metals generally possess 4, 5, 6, or 7 electrons in their valence shell. The non-metals are those, which are devoid of all the metallic properties.  

• The non-metals in their solids-state are brittle, thus, they lack ductility and malleability exhibited by the metals.  

• The non-metals are not shiny like metals, they are dull in color.  

• The non-metals seem to possess low density, primarily as non-metals seem to prevail either in a liquid or solid-state. The non-metals lack the dense and closed packing in the lattice, which is seen in metals.  

Thus, non-metals are brittle, dull, and low in density.  

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Answer:

C.

Explanation:

The movement of the bow is Kinetic Energy.

Answer: C. Kinetic energy to sound energy

Explanation: The vibration of the string is kinetic energy that transforms into sound energy.

Answer:

WTH? That is WOW....-_-

Answer:

wow

Explanation:

wow

Explanation:

where there are negative or positive ions

Explanation:

Protons

Each element has an atomic number. The atomic numbers are listed along with the names and symbols of the elements on the inside cover of the text. The atomic number equals the charge on the nucleus. It therefore also equals the number of protons in the nucleus and also equals numerically the number of electrons in the neutral atom. The atomic number has the symbol Z.

Different elements have different atomic numbers; therefore, atoms of different elements contain different numbers of protons (and electrons). Oxygen has the atomic number 8; its atoms contain 8 protons and 8 electrons. Uranium has the atomic number 92; its atoms contain 92 protons and 92 electrons.

The relationship between atomic number and the number of protons or electrons can be stated as follows:

Atomic number= number of protons per atom= number of electrons per neutral atom

B. Mass Number Equals Protons plus Neutrons

Each atom also has a mass number, denoted by the symbol A. 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.

Number of neutrons = mass number - atomic number

or

Mass number = number of protons + number of neutrons

The atomic number and the mass number of an atom of an element can be shown by writing, in front of the symbol of the element, the mass number as a superscript and the atomic number as a subscript:

mass number

atomic numberSymbol of elementorA

ZX

For example, an atom of gold (symbol Au), with an atomic number 79 and mass number of 196 is denoted as:

196

79Au

C. Isotopes

Although all atoms of a given element must have the same atomic number, they need not all have the same mass number. For example, some atoms of carbon (atomic number 6) have a mass number of 12, others have a mass number of 13, and still others have a mass number of 14. These different kinds of the same element are called isotopes. Isotopes are atoms that have the same atomic number (and are therefore of the same element) but different mass numbers. The composition of atoms of the naturally occurring isotopes of carbon are shown in Table 4.2.

TABLE 4.2 The naturally occurring isotopes of carbonIsotopeProtonsElectronsNeutrons12

6C66613

6C66714

6C668

The various isotopes of an element can be designated by using superscripts and subscripts to show the mass number and the atomic number. They can also be identified by the name of the element with the mass number of the particular isotope. For example, as an alternative to

12

6C,13

6C,and14

6C

we can write carbon-12, carbon-13, and carbon-14.

About 350 isotopes occur naturally on Earth, and another 1500 have been produced artificially. The isotopes of a given element are by no means equally abundant. For example, 98.89% of all carbon occurring in nature is carbon-12, 1.11% is carbon-13, and only a trace is carbon-14. Some elements have only one naturally occurring isotope. Table 4.3 lists the naturally occurring isotopes of several common elements, along with their relative abundance.

TABLE 4.3 Relative abundance of naturally occurring isotopes of several elementsIsotopeAbundance (%)hydrogen-199.985hydrogen-20.015hydrogen-3tracecarbon-1298.89carbon-131.11carbon-14tracenitrogen-1499.63nitrogen-150.37 oxygen-1699.76oxygen-170.037oxygen-180.204IsotopeAbundance (%)silicon-2892.21silicon-294.70silicon-303.09chlorine-3575.53chlorine-3724.47phosphorus-31100iron-545.82iron-5696.66iron-572.19iron-580.33 aluminum-27100

Answer:

Explanation:

To find the number of moles given the number of entities we use the formula

[tex]n = \frac{N}{L} \\ [/tex]

where n is the number of moles

N is the number of entities

L is the Avogadro's constant which is

6.02 × 10²³ entities

From the question

N = 1.93 × 10²³ particles

We have

[tex]n = \frac{1.93 \times {10}^{23} }{6.02 \times {10}^{23 } } \\ = 0.320598006...[/tex]

We have the final answer as

Hope this helps you

No. of particles of Na₃PO₄ = 1.93×10²³

We have to find number of moles of the given compound[tex].[/tex]

Number of moles cam be found by using this formula :

[tex]\bigstar\:\boxed{\bf{\purple{n=\dfrac{N}{N_A}}}}[/tex]

We know that,

★ Calculation :

➠ n = N/[tex]\sf{N_A}[/tex]

➠ n = (1.93×10²³)/(6.022×10²³)

➠ n = 0.32 moles

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