Suppose that a fictitious element, X, has two isotopes: 59X (59.015 amu) and 62X (62.011 amu). The lighter isotope has an abundance of 81.7%. Calculate the atomic mass of the element X.

Answer:

C. a spectrum of many different colors of light.

Explanation:

White light is made up of all the colors and all wavelengths.

Answer:

c

Explanation:

Answer:

A new Dana system of classification contains 78 different classes of minerals based on composition and then further classified by type and group. To be considered a mineral, a substance must be an inorganic, naturally formed solid, with a specific chemical formula and a fixed internal structure. To test whether something is a mineral, there are several identification tests to which the substance is subjected, including its resistance to scratching, its density in comparison to water, its color, the degree of light it reflects, the color of the powdered mineral, its breakage pattern and its crystalline form.

Explanation:

Answer: chemical makeup and crystal lattice structure

Explanation:

The minerals are the inorganic substances that are extracted beneath the earth crust. These minerals are associated with the gangue particles that are required to be removed by processing.

The minerals can be classified on the basis of the chemical and physical properties. The chemical properties define the chemical composition of the mineral. The physical properties define how minerals react with the external environment.

Thus chemical makeup and crystal lattice structure can be a useful approach to classify the minerals as the minerals may differ chemically as well as in structural makeup.    

Answer:

Explanation:

                                          1. State

                                        2. Physical properties

        3. Solid                            4. liquid                             5. gas.

6. incompressible           7. virtually incompressible     8. compressible

9. tightly packed           10. loosely packed particles     11. particles far apart

    particles

The concept map briefly shows the different states of matter and their physical properties. Matter is anything that has weight and occupies space. There are 3 states of matter which are solid, liquid and gas.

The terms are organized based on the three states of matter: solid, liquid, and gas. Solids and liquids are incompressible and have tightly or loosely packed particles respectively while gas is compressible with particles far apart.

The terms can be organized into a concept map that focuses on the three states of matter and their respective physical properties.

The term 'virtually incompressible' would typically be used to describe liquids and solids, as while they are not absolutely incompressible, they are so relative to gases.

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6 meters is a longer distance. It takes 100 centimeters to equal 1 meter.

HOPE IT HELPS :)

Answer:

Protons: 79

Electrons: 78

Explanation:

1. The number of protons is the atomic number (The atomic number for Au on the periodic table is 79)

2. Since the charge is +1 (positive) it means that there's one more proton than electrons. So, 79-1 = 78 electrons

Answer:

9.61 % error

Explanation:

The formula for percent error is as follows:

% error = (experimental value - theoretical value) ÷ theoretical value × 100%

So to calculate the percent error all you have to you is plug in your values.

% error = (4.45cm - 4.06cm)/4.06 × 100%

= 0.39/4.06 × 100%

= 0.0961 × 100%

= 9.61 % error

Answer:

6.06miles

Explanation:

Given parameters:

Speed of the car = 39km/hr

Time = 15minutes

Unkown:

Distance in miles

Solution:

  Speed is the change in distance with time.

             Speed = [tex]\frac{Distance }{Time}[/tex]

We need to express our parameters in the same workable units. So we should convert the given time to hour.

          60min = 1hr

          15 min = 0.25hr

   Therefore:

           Distance = speed x time = 39km/hr x 0.25hr = 9.75km

Now convert km to miles

                      1.609km = 1mile

                        9.75km =  [tex]\frac{9.75 }{1.609}[/tex] , 6.06miles

The moss leaf cells contain cell wall, nucleus, chloroplasts, and cell membrane.

The moss leaf cells contain the following cell structures:

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Moss leaf cells contain a cell wall, a nucleus, chloroplasts, mitochondria, and a cell membrane. The cell wall provides structure, the nucleus acts as the command center, chloroplasts facilitate photosynthesis, mitochondria produce energy, and the cell membrane controls substance movement.

Moss leaf cells contain several common structures seen in plant cells. They have a cell wall, which is primarily composed of cellulose and serves functions such as protection, providing structural support, and giving shape to the cells.

These cells also contain a nucleus, which is the control center of the cell. There are chloroplasts present in moss leaf cells; this is where photosynthesis takes place, allowing the plant to convert sunlight into energy. Moss leaf cells also have mitochondria, which are the powerhouses of cells as they are responsible for producing energy in the form of ATP. Finally, these cells have a cell membrane, which is the semipermeable membrane surrounding the cytoplasm of the cell, controlling the movement of substances in and out of the cell.

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Answer:

Control

Explanation:

The control is the variable that you don't change. Like, imagine you're doing an experiment and are trying to figure out how much of a faster growth rate occurs with fertilized plants. You will compare the fertilized plant to the unfertilized one, which is the control, to see the difference the fertilizer made.

Hope this helped :)

Answer:

The element oxidized is the one whose oxidation number INCREASES......

Explanation:

And thus......

+

I

I

  2CuO

+

C

→

2

0

C

u

+

C

O

2

↑

⏐

⏐

And here while copper (as  

C

u

2

+

) is reduced, carbon is oxidized,  

0

C

→

+

I

V

C

.

The second reaction represents the reduction  

C

r

(

V

I

+

)

to  

C

r

(

I

I

I

+

)

C

r

2

O

2

−

7

+

14

H

+

+

6

e

−

→

2

C

r

3

+

+

7

H

2

O

(

i

i

)

And the oxidation of ethanol to carbon dioxide:

H

3

C

−

C

H

2

O

H

+

H

2

O

→

2

C

O

2

+

8

H

+

+

8

e

−

(

i

i

i

)

i.e.  

H

3

−

I

I

I

C

−

−

I

C

H

2

O

H

→

2

+

I

V

C

O

2

We takes  

4

×

(

i

i

)

+

3

×

(

i

i

i

)

to eliminate the electrons.....

3

H

3

CC

H

2

O

H

+

3

H

2

O

+

4

C

r

2

O

2

−

7

+

56

H

+

+

24

e

−

→

8

C

r

3

+

+

28

H

2

O

+

6

C

O

2

+

24

H

+

+

24

e

−

To give finally............

3

H

3

CC

H

2

O

H

+

4

C

r

2

O

2

−

7

+

32

H

+

→

8

C

r

3

+

+

25

H

2

O

+

6

C

O

2

Dichromate ion

is reduced to  

chromic ion

The oxidation takes place in option B (Fe2O3 + 3CO - 2Fe + 3CO2) where Carbon (C) in CO gets oxidized to CO2 moving from an oxidation state of +2 to +4.

In Chemistry, an oxidation reaction is characterized by the loss of electrons during the reaction. Looking into the provided options for reactions, we can understand which compound gets oxidized by observing which substance loses electrons (i.e., has a valence increase).

Option A cannot be the answer since copper (Cu) reduces from Cu to Cu and carbon (C) also reduces from atomic state to be part of CO2.

Option B, (Fe2O3 + 3CO - 2Fe + 3CO2), showcases oxidation. In this case, Carbon (C) in CO is getting oxidized to form CO2. In the process of this reaction, Carbon (C) changes from an oxidation state of +2 (in CO) to +4 (in CO2).

Option C, shows the reduction of Mg from atomic state to ionic state in MgO. Option D, shows Mn reducing from +4 oxidation state to +2 oxidation state in MnCl2, with Cl also transforming component state. However, none of these are examples of oxidation.

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Answer:

Acetone is a compound.

Acetone is a compound comprising of carbon,hydrogen and oxygen atoms.

Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.

Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:

1)Molecular compounds where in atoms are joined by covalent bonds.

2) ionic compounds where atoms are joined by ionic bond.

3)Inter-metallic compounds where atoms are held by metallic bonds

4) co-ordination complexes where atoms are held by co-ordinate bonds.

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Answer:

average atomic mass of sulfur = 32.066 amu

Explanation:

The average atomic mass is calculated as following:

average atomic mass = fraction of isotope (1) × mass number of the isotope (1) + fraction of isotope (2) × mass number of the isotope (2) + ... + fraction of isotope (n) × mass number of the isotope (n)

average atomic mass of sulfur = (95/100) × 32 + (0.76/100) × 33 + (3.22/100) × 34 + (0.89/100) × 36 = 32.066 amu

(amu - atomic mass units)

Answer:

Arsenic is present in p block and group fifteen of periodic table.

Explanation:

The atomic number of Arsenic is 33.

According to the Aufbau principal in ground state of elements electron first occupy the lower energy level then fill the higher energy levels. We know that there four subshells s, p, d and f. The maximum number of electrons in these subshells can be calculated by following formula:

2 (2l +1 )

and l = 0,1,2,3,....

maximum numbers of electrons in s subshell are,

l=0

2 ( 2(0) + 1)

2

so maximum electrons in s subshell are 2.

maximum numbers of electrons in p subshell are,

l = 1

2 ( 2(1) + 1)

2( 2 + 1)

6

so maximum electrons in p subshell are 6.

maximum numbers of electrons in d subshell are,

l = 2

2 ( 2(2) + 1)

2( 4 + 1)

10

so maximum electrons in d subshell are 10.

maximum numbers of electrons in f subshell are,

l = 3

2 ( 2(3) + 1)

2( 6 + 1)

14

so maximum electrons in f subshell are 14.

Electron first fill 1s subshell then 2s subshell and in this way they goes to higher energy levels.

Electronic configuration of Arsenic:

1s2 2s2 2p6 3s2 3p6 4s2 3d10, 4p3

The last electron is present in p subshell that's way Arsenic is present in p block of periodic table.

P block elements are non-metals, metals and metalloids. These are thirty five elements. The P-block elements are present on right side of periodic table. There valance electrons are present in P orbital. The p-block metals are shiny and good conductor of heat and electricity. These metal lose the electron which is accept by non metals and form ionic bond. They have high melting points.

Metalloids includes boron, silicon, germanium, arsenic, antimony and tellurium. Metalloids contain both the properties of metals and non metals, Some metalloids are toxic like arsenic.

Most of p-block elements are non metals. They are bad conductor of heat and electricity and have low boiling points.

Arsenic is in the p-block of the periodic table. This is because its last electron occupies the 4p level, which is characteristic of p-block elements.

The periodic table is divided into four blocks based on the type of atomic orbital that is being filled with electrons: s-block, p-block, d-block, and f-block. In the case of arsenic, which has an atomic number of 33, the electron configuration can be written as [Ar]4s² 3d¹⁰ 4p³. Here, the last three electrons are added to the 4p subshell after filling the 4s and 3d subshells.

The presence of the three electrons in the 4p orbital indicates that arsenic belongs to group 15 (or group V in older notation), which includes other elements such as nitrogen, phosphorus, and antimony. The properties of p-block elements, including their tendency to form covalent bonds and various oxidation states, are influenced by their electron configuration, especially the behavior of the p electrons.

Answer:

it will explode

Explanation:

the ingredients in sulphate and most sodas dont mix. they will clash, and explode.making a HUGE mess.

When caustic soda reacts with sulfur, it forms sodium sulfide and water.

When caustic soda is reacted with sulfur, it forms sodium sulfide and water as shown in the chemical equation: 2NaOH + S → Na2S + 2H2O.

Sulfur reacts with caustic soda to produce sodium sulfide.

Answer:

From an object with a high temperature to an object with a lower temperature.

Explanation:

Answer:

Photovoltaic cell or solar cells

Explanation:

Solar cells are cells that converts light energy from the sun into electrical energy for use in appliances. Light energy impinges on these cells, the photons of light causes electrons in the solar cells to move thereby resulting in the production of electricity in the cells.

To determine if a crown is made of solid gold, you can measure its density or look for certain markings or stamps indicating its purity.

One way to determine if a crown is made of solid gold is to measure its density. Gold has a density of 19.3 g which is higher than most other metals. To find the density of the crown, you need to measure its mass using a balance and its volume using water displacement. If the density of the crown matches the density of gold, it is likely made of solid gold.

Another way to determine if the crown is made of solid gold is to look for certain markings or stamps. In many countries, solid gold items are required to have a hallmark, which indicates the purity of the gold. This hallmark can usually be found on the inside of the crown. It is important to note that these methods provide a good indication but cannot guarantee with absolute certainty if a crown is made of solid gold.

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Answer: A.Estimate measurements to the nearest 0.05cm

D.start all measurements from the zero (0) mark

For Edg

Explanation:

Answer:

When the particles of a solution or a mixture are so small that they cannot be seen directly from our naked eyes the mixture was formed due called colloid. These are heterogeneous mixtures.

Explanation:

There are different methods to tell a mixture from compound and in this case it is done by passing light through it. When a beam of light is passed through this mixture the particles although being small all are enough such that scattering of the beam takes place and its path can be seen.  

Answer: Energy transfers from the metal to the water and calorimeter until they are all at room temperature.

Explanation: hope this helps

Answer:

1. Color Change

2. Change in temperature

3. Noticiable Odor

4. Formation of bubbles

A chemical change, usually irreversible, results in the formation of new substances, the release or absorption of energy, and sometimes the production of gases or solids. Indicators of a chemical change include changes in color, production of a gas, formation of a precipitate, and changes in temperature.

A chemical change is a process that results in the transformation of one set of chemical substances to another. During this type of change, the atoms in the reactants rearrange to form one or more different substances, and this is usually an irreversible process. Some common results of a chemical change can include the formation of new substances, the release or absorption of energy, and the production of gases or solid materials.

Four indicators of a chemical change are:

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Answer:

Chlorine

Explanation:

Chlorine has the electron configuration 1s2 2s2 2p6 3s2 3p5. This is because it has 17 electrons.

Answer: The element having given electron configuration is chlorine.

Explanation:

Electronic configuration tells us about the number of electrons that are present in an atom. It also determines the atomic number of an element.

We are given:

Electronic configuration of element = [tex]1s^22s^22p^63s^23p^5[/tex]

Total number of electrons in the given element = (2 + 2 + 6 + 2 + 5) = 17

Element having atomic number '17' is chlorine

Hence, the element having given configuration is chlorine

Answer:

Option A= copper

Explanation:

According  to specific heat capacity of substances, copper will reach to the our body temperature first.

Specific heat capacity:

It is the amount of heat required to raise the temperature of one gram of substance by one degree.

Formula:

Q = m × c × ΔT

specific heat capacity of copper = 0.385 J/g. °C

specific heat capacity of aluminium = 0.902 J/g. °C

so copper will absorb the heat very quickly and raise the temperature in very less time as compare to aluminium.

Final answer:

Copper reaches body temperature before aluminum because it requires less heat to increase its temperature due to its lower specific heat capacity.

Explanation:

The student is asking which metal, copper or aluminum, each weighing one gram and initially at 0° C, will reach body temperature first if they both absorb heat at the same rate. This question is related to thermal properties of materials, specifically specific heat capacity, which indicates the amount of heat required to raise the temperature of a certain mass of a substance by one degree Celsius.

Copper has a lower specific heat capacity (0.386 J/g°C) compared to aluminum (0.900 J/g°C), as indicated by the given data. Therefore, copper will reach body temperature before aluminum because it needs less heat to raise its temperature.

Answer:

CH4, which is the molecular formula for Methane

CH₄ is the correct molecular formula for a compound that contains one atom of carbon and four atoms of hydrogen. Therefore, option A is correct.

The molecular formula is an expression that specifies the number of atoms of each element in a compound molecule. It displays the exact number of atoms in a molecule. Propane, for example, has the molecular formula C₄H₁₀. The given compound contains four carbon atoms and ten hydrogen atoms according to this formula.

A molecular formula tells us which atoms are present in a molecule and how many of each type of atom are present. When there is only one atom of a given type, no subscript is used.

Methane (CH₄) is the most basic hydrocarbon, with one carbon atom and four hydrogen atoms. Methane is an extremely potent greenhouse gas.

Thus, option A is correct.

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Final answer:

OPTION B.

Dalton's atomic theory highlighted that atoms are the smallest indivisible units of matter and that they combine in whole number ratios to form compounds.

Explanation:

One main point of Dalton's atomic theory is that atoms made up the smallest form of matter. Dalton proposed that all matter is composed of these minute, indivisible particles, which he referred to as atoms, and these atoms cannot be subdivided, created, or destroyed. This concept also suggested that atoms of a given element are identical in size, mass, and other properties, whilst atoms of different elements differ. Additionally, Dalton's theory asserted that atoms of different elements can combine in whole number ratios to form chemical compounds and that during chemical reactions, atoms are rearranged but neither created nor destroyed.

Answer:

Everything is composed of atoms, that are the indivisible building blocks of matter that cannot be destroyed. All atoms of an element are identical.

Explanation:

Answer:

Intermolecular

Explanation:

Intermolecular forces are the forces operating between the two molecules.  These forces are of short rang forces and also known as week intermolecular forces.

These forces only exist when molecules get close together by force of by cooling.

Example:

Hydrogen bond (intermolecular forces) exist in liquid water molecules but when we heat it the water molecule escape from surface by as hydrogen bond break by heating.

Compressed Natural Gas:

In this case the molecules of natural gas presses and the come closer so the distance between the molecules become less and force of attraction increase that attraction (intermolecular force ) is due to short distance.

The attractive forces that come into play as atoms or molecules move closer together are called intermolecular (Option A) forces, which are vital for determining a substance's physical properties.

The attractive forces between atoms or molecules as they move closer together are called intermolecular forces. These forces are electrostatic in nature, which means they arise from the interactions between positively and negatively charged species. Intermolecular forces are much weaker than the bonds within molecules (intramolecular forces), but they are essential in determining physical properties such as the state of matter.

Intermolecular forces are especially significant in solids and liquids, where the proximity of the molecules leads to a cumulative effect, making these forces quite substantial. In gases, these interactions become noteworthy only at very high pressures, where they cause deviations from the ideal gas law as real gases exhibit behavior that differs from the theoretical ideal.

Answer:

Sublimation is used to separate a mixture of sand and ammonium chloride. Sublimation is a separation process that entails heating a mixture of solids, where one of the solids transitions from solid to gas without passing through the liquid state. ... This process leaves behind the sand in its natural state.

Explanation:

Answer:

When a mixture of sand and ammonium chloride is heated, the ammonium chloride sublimates out and sand is left behind.

Explanation:

Sublimation is the process in which, a substance directly goes into its gaseous state, without passing through the liquid state, on heating.