The characteristic of group 14 elements is that they have four valence electrons in their outermost shell.
What is an Element?This is referred to as a substance which can't be broken down into simpler substances through as chemical reaction and examples include hydrogen, calcium etc.
These elements are arranged into different groups and periods on a periodic table according to their similarities. For example group 14 elements have four valence electrons which they need to complete in other to achieve a stable configuration.
Example of group 14 elements are carbon,silicon, tin etc which form covalent bonds with other elements in a reaction so as to ensure that that both become stable and is therefore the reason why it was chosen as the most appropriate choice.
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Which of the following is TRUE if ΔEsys = -100 J?
The statement that is true if the ΔEsys = -100 J is that the system looses 100J of energy which is gained by the surroundings.
What is the energy of the system?Note that the study of energy is what we call thermodynamics. We should note that according to the laws of thermodynamics, energy can not be created nor destroyed but can be converted from one form to another.
This implies that the energy that is lost by the system must be gained by the surroundings since there can never be energy that goes to waste in the system.
Recall that the universe is composed of the system and the surroundings and the energy that is lost by the system must be gained by the surroundings and vice versa. This would now be our guide in deciding which statement is right above from what we have in the question here.
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What is the limiting reagent when 1.5 moles of nitrogen react with 6 moles of hydrogen? N2(g)+3H2(g)—> 2NH3(g)
Explanation
Given
N2(g)+3H2(g)—> 2NH3(g)
Number of moles of nitrogen = 1.5 moles
Number of moles of hydrogen = 6 moles
Required: Limiting reagent
Solution
For Nitrogen:
[tex]\begin{gathered} 1,5\text{ mol N x }\frac{2\text{ mol NH}_3}{1\text{ mol N}_2} \\ \\ Moles\text{ of NH}_3=3\text{ mol} \end{gathered}[/tex]For Hydrogen:
[tex]\begin{gathered} 6\text{ mol H x }\frac{2\text{ mol NH}_3}{3\text{ mol H}_2} \\ \\ Moles\text{ of NH}_3=\text{ 4 mol} \end{gathered}[/tex]The limiting reagent is Nitrogen, because less moles of NH3 will be produced by nitrogen, meaning it all of it gets used up.
Answer
The limiting reagent is Nitrogen.
help me pls Thank you if you do
We can say that Javier is right because the reactivity of the elements tends to decrease from left to right.
What is the periodic table?The periodic table is an arrangement of the elements in order of increasing atomic number. Let us note that the modern periodic law states that the properties of the elements is a periodic function of their atomic numbers .Thus the atomic numbers of the elements tends to increase from left to right in the periodic table as we can see in the image that have been attached to the question above.
Now, we know that the reactivity of the elements also tend to decrease from left to right. This is because, the heavier the element, the less reactive that the element is. Recall that every period that we can find in the periodic table tends to end up with a non reactive noble gas element.
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How many grams are in 105.4 mol of nickel
Answer:
6186.98
Explanation:
105.4 mol of nickel is 6186.98 nickel
If the chemical reaction AB + CD to AD + BC releases heat, what is true of the stored bond energy of the reactants and products?
The bonds do not have energy, the atoms release heat.
change: unmarried alternative AB + C → AC + B
exchange: Double alternative AB + CD → ad + CB
mixture (Synthesis) A + B → AB
Decomposition AB → A + B
A chemical reaction is a method that ends in the chemical transformation of one set of chemical substances to some other.
A procedure that includes rearrangement of the molecular or ionic shape of a substance, in preference to a exchange in bodily form or a nuclear reaction.
A chemical response is a technique in reactants react chemically and convert into products via chemical transformation. as an example, breathing – we inhale oxygen which reacts with glucose and produces carbon dioxide, water and strength. The response is given below. C6H12O6 + 6O2 → 6CO2 + 6H2O + power.
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Convert
7.4 x 10e28 cg/L to Mg/mL
The unit of the density of the substance from cg/L to mg/mL is 7.4 x 10²⁶ mg/mL.
What is unit conversion?
Unit conversion is a method or a way of converting a given quantity from one unit to another.
The density of a substance can be measured in different units as shown blow;
kg/m³g/cm³cg/Lmg/ml, etcThe density of the substance can be converted to the required unit as shown below.
7.4 x 10²⁸ cg/L to mg/ml
= (7.4 x 10²⁸ cg/L) x (10 mg/cg) x (1 L / 1000 mL)
= 7.4 x 10²⁶ mg/mL
Thus, the unit of the density can be converted from centigram per liter to milligram per milliliter.
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hello, can someone please help me with this problem
Answer:
chicken tenders and egg rolls and butter fingers
How many moles of potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced? Can you show steps for answer
Moles of potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced is 28.63 mole
Potassium nitrate is an inorganic salt with a chemical formula of KNO₃ it is a natural source of nitrate and has been used as a constituent for several different purposes including food preservatives, fertilizers, tree stump removal, rocket propellants, and fireworks
Here given data is
4.4 moles of aluminum phosphate
We have to find moles of potassium nitrate =?
Number of mole = mass of substances/mass of one mole
Number of mole = 126/ 4.4 moles
Number of mole = 28.63mole
So, 28.63 mole potassium nitrate are produced at the same time 4.4 moles of aluminum phosphate are produced
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Which of the following factors can affect the solubility of a substance? Select all that apply.
The following factors can affect the solubility of a substance is temperature and pressure
Solubility is the maximum amount of substances that will dissolve in a given amount of solvent at specific temperature and solubility is the characteristics property of specific solute and solvent combination and different substances has greatly different solubility's and there are two direct factor that affect the solubility and they are temperature and pressure and temperature affect solubility of both solid and gases but pressure only affect the solubility of gases
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There are usually more objects at a crime scene than investigators can efficiently collect and analyze.
A.
True
B.
False
Answer:
A. True
Explanation:
In a 5.0 g sample of sodium chloride, 39.34% of the compound is sodium. What is the percent by mass of sodium in a 25 g sample of sodium chloride?
The percentage by mass of sodium in a 25 g sample of sodium chloride =39.92%
What is a chemical compound?A chemical compound is made up of two or more elements which are chemically combined together.
For example sodium chloride which contains sodium and chloride are chemically combined together to form sodium chloride as a chemical compound.
The first compound of sodium chloride= 5g
The percentage that is sodium= 39.34%
The second compound of sodium chloride= 25g
The percentage that is sodium= x%
That is = 5g = 39.34%
Therefore quality of sodium in grams;
= 39.34/100× 5
= 0.3934× 5
= 1.967g
Therefore if 5g of NaCl contains 1.967g of Na
25g of NaCl will contain xg
Make xg the subject of formula,
= 25×1.978/5
= 49.45/5
= 9.98g of sodium.
To conver 9.98g to %;
=9.98/25 × 100/1
= 0.3992×100/1
= 39.92% of sodium.
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Which of the following accounts for the differences among the various amino acids
a. the amine group
b. the side chain
c. the acid group
d. a and b
e. b and c
The group that accounts for the difference among the various amino acids is the side chain (option B).
What are amino acids?Amino acids are any chemical molecule that has both an amino and a carboxylic acid functional group.
The antecedents or building blocks of protein molecules are known as amino acids. Ingredients that make up amino acids include:
Amino group (-NH2)Carboxyl group (-COOH)R-groupThe R group, a particular side chain, is also joined to the carbon in each of the 20 amino acids. The shapes, sizes and charges of the R groups vary. As a result, amino acids can be categorized based on the characteristics of their side chains.
All amino acids have the same amino and carboxyl groups; the R group, however, differs for each amino acid.
In nature, there are 20 different amino acids, each of which has an amino and carboxyl group. However, what sets them apart from one another is that they each have a unique R (side) chain.
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How would I go About solving this with a chart?
Atomic Structure - Dalton's Atomic Theory
From Dalton's experiments and observations, and from the work of some of his colleagues he proposed a new theory of the atom.
Answer:
For answering we will have to create a 5x3 table. It will have the following headings:
The information that has to go in the table is:
Dalton's Postulates
1.1:All matter is composed of extremely small particles called atoms.
2.1: Atoms of a given element are identical in size, mass, and other properties. Atoms of different elements differ in size, mass and other properties.
3.1: Atoms cannot be subdivided, created or distroyed.
4.1 Atoms of different elements can combine in simple whole number ratios to form chemical compounds.
5.1: In chemical reactions, atoms are combined, separated or rearranged.
Keep/Modify/Discard:
1.2:Keep
2.2:Modify
3.2:Modify
4.2:Keep
5.2:Keep
Rewrite in case of need:
1.3: No need
2.3: Atoms of different elements differ in size, mass and other properties. Atoms of a given element can also differ in mass.
3.3: Atoms can be further subdivided, and using nuclearfission and fussion techniques atoms can be created or destroyed by changing them into other atoms.
4.3:No need
5.3: No need
When a 1.00 L sample of water from the surface of the Dead Sea (which is more than 400 meters below sea level and much saltier than ordinary seawater) is evaporated, 156 grams of MgCl₂ are recovered. What is the molarity of MgCl₂ in the original sample?
The What is the molarity of MgCl₂ in the original sample is 1.63 mol/L
[tex]Molarity = \frac{Mass\ of\ MgCl_2}{molar \ mass\ of MgCl_2} \times\frac{1}{volume \of \ the\ solution \ in\ litres}[/tex]
[tex]Molarity = \frac{156g}{95.211g/mol} \times\frac{1}{1L}\\\\Molarity = 1.63 \ mol/L[/tex]
What is molarity ?Molarity (M) is the amount of a substance in a certain volume of solution. Molar concentration is a measure of the concentration of chemical compounds, especially a solute in a solution, as the amount of the substance per unit volume of the solution. In chemistry, the most commonly used unit of molarity is the number of moles per litter, indicated in the SI unit mol/L or mol/dm³.
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Identify the unknown elements from part C using the periodic table. Look for trends in the properties of the elements in each group. Use your answers from part C to guide you
The unknown elements based on their physical properties are as follows:
Element 1 is Krypton
Element 2 is Strontium
Element 3 is Lead
Element 4 is Bromine
Element 6 is Francium
What are some of the physical properties of elements used to identify them?Some of the physical properties of elements used to identify the elements include:
Physical state: may be solid, liquid, or gasConductivity: may be a good or poor conductorSolubility in water: may be soluble, insoluble, or fairly soluble Melting point: may be high or low.Considering the properties of the given elements from the periodic table:
Element 1 = Krypton
State of matter: gasConductivity: very poorSolubility (H₂O): noneMelting point: -157°CElement 2 = Strontium
State of matter: solidConductivity: goodSolubility (H₂O): reacts rapidlyMelting point: 777°CElement 3 = Lead
State of matter: solidConductivity: poorSolubility (H₂O): noneMelting point: 327°CElement 4 = Bromine
State of matter: liquid Conductivity: very poorSolubility (H₂O): negligibleMelting point: -7°CElement 5 = Copper
State of matter: solidConductivity: excellentSolubility (H₂O): noneMelting point: 1085°CElement 6 = Francium
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29. How many protons, neutrons, and electrons does 35/17C1¹+ have?
Answer:
proton= 17
neutron=18
electron=16
Condensation is a chemical reaction of _______. It represents _______ producing ______.
Decomposition
Synthesis
One organic molecule and a water molecule
Two organic molecules
One organic molecule
A water molecule
Exchange
Condensation is a chemical reaction of synthesis and represents two organic molecules producing one organic molecule.
What is condensation reaction?Condensation reaction is a reaction of two substances with the simultaneous loss of water or other small molecule.
Condensation reaction is a chemical reaction that synthesizes larger molecules from two or more smaller molecules with the release of water.
An example of condensation reaction is the synthesis of dipeptide (protein) from amino acids building blocks.
Therefore, it can be said that condensation synthesizes larger organic molecules from two smaller ones.
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Pablo knows that NaCl dissolves in water and that elements in the same group of the Periodic Table often have similar chemical properties. He develops a hypothesis that states: All chloride salts of group I metals are soluble in water.
He proposes to test his theory by taking a small sample of each type of salt and stirring it into a beaker of water.
What will he observe if his prediction is true?
A.
Each of the solid salts will produce bubbles when mixed with the liquid water.
B.
Each mixture of salt and water will become a different color.
C.
At least some of the solid added will cease to be visible at the bottom of each beaker.
D.
After they are stirred, each of the beakers will each feel hot to the touch.
A small sample of chloride salts of group I metals on stirring with water on a beaker, at least some of the solid added will cease to be visible at the bottom of each beaker.
Group I elements are Hydrogen, Lithium, Sodium, Potassium, Rubidium, Cesium and Francium.
When chloride salts of these elements where dissolved in water it would not produce bubbles or change colour.
In addition to that, not all salts would feel hot to touch when the beaker in which the salt was dissolved is touched. Some would feel cool. This is because of difference in the process happening between the salt and water. For example: HCl would release heat when dissolved in water – Exothermic reaction (Beaker would be hot to touch) whereas KCl would absorb heat when dissolved in water – Endothermic reaction (Beaker would be cool to touch).
One common thing about chloride salts of group I elements is that they all dissolve in water. The bond between the elements and the chloride is Ionic in nature. In the water, the bond between the molecules is covalent. The covalent bonds are stronger than ionic bonds. Thus, ionic bonds dissociate and covalent bonds would be formed with water and dissociated ions i.e., chloride salts are dissolved in water. When this happens, solid would cease to be visible at the bottom of each beaker.
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How does the formation of an ionic bond differ from the formation of a covalent bond?
1) An ionic bond is where one atom transfers at least one electron from another atom in an attempt to fill its electron shell. A covalent bond is when electrons are shared
between atoms and there is equality between atoms in relation to their electrons.
2) Ionic bonds form by the transfer of electrons. Covalent bonds form by sharing
electrons. In ionic bonding, electrons are completely transferred from one atom to
another. In the process of either losing or gaining negatively charged electrons, the
reacting atoms form ions. Ions that have a positive charge are called cations and the
ones that have a negative charge are called anions. On the other hand, covalent bonds can be formed by any equal or unequal sharing of electrons. The substances formed by ionic bonds are called compounds and those formed by covalent bonds are referred to as molecules.
3) The formation of an ionic bond differs from the formation of a covalent bond by
being so, a covalent bond forms when one electron in the outer electron orbit of each
atom is shared between the two atoms. Covalent has only one electron to be shared
and ionic has more than one electron to be transferred.
(HELP IS NEEDED SOON. THANK U SO MUCH)
Covalent bonds and ionic bonds differ as follows: ionic bonds form by the transfer of electrons. Covalent bonds form by sharing electrons. In ionic bonding, electrons are completely transferred from one atom to
another. In the process of either losing or gaining negatively charged electrons, the
reacting atoms form ions. Ions that have a positive charge are called cations and the ones that have a negative charge are called anions. On the other hand, covalent bonds can be formed by any equal or unequal sharing of electrons. The substances formed by ionic bonds are called compounds and those formed by covalent bonds are referred to as molecules (option 2).
What are ionic bonds?Ionic bonds are a type of chemical bond where two atoms or molecules are connected to each other by electrostatic attraction.
On the other hand, a covalent bond is a type of chemical bond where two atoms are connected to each other by the sharing of two or more electrons.
Ionic bonds occur between metals, which lose electrons, and nonmetals, which gain electrons. Ions with opposite charges will attract one another creating an ionic bond.
Also, covalent bonds form when two atoms of similar charges share electron pairs.
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A 68.0 mL portion of a 1.50 M solution is diluted to a total volume of 208 mL. A 104 mL portion of that solution is diluted by adding 161 mL of water. What is the final concentration? Assume the volumes are additive.
Taking into account the definition of dilution, after two dilutions the final concentration is 0.1923 M.
DilutionWhen it is desired to prepare a less concentrated solution from a more concentrated one, it is called dilution. This is accomplished by simply adding more solvent to the solution at the same amount of solute.
In a dilution the amount of solute does not change, but as more solvent is added, the concentration of the solute decreases, as the volume of the solution increases.
A dilution is mathematically expressed as:
Ci×Vi = Cf×Vf
where
Ci: initial concentrationVi: initial volumeCf: final concentrationVf: final volumeFinal concentrationIn this case, you know for the first dilution:
Ci= 1.50 MVi= 68 mLCf= ?Vf= 208 mLReplacing in the definition of dilution:
1.50 M× 68 mL= Cf× 208 mL
Solving:
(1.50 M× 68 mL)÷ 208 mL= Cf
0.49 M= Cf
Now, in a second dilution you take a sample of 104 mL of this diluted solution and add another 161 mL of water. The final volume of the solution will be
Vfinal= 104 mL + 161 mL= 265 mL
The concentration of the 104 mL sample is equal to the concentration of the first diluted solution, this is 0.49 M. Therefore, the concentration of the final solution will be:
0.49 M× 104 mL= Cf× 265 mL
Solving:
(0.49 M× 104 mL)÷ 265 mL= Cf
0.1923 M= Cf
In summary, the final concentration is 0.1923 M.
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i need help with chemistry equation
The maximum amount of ethane (C₂H₆) that can be formed is 9.15 g.
The formula for the the limiting reagent is H₂
The amount of excess reagent that remains after the reaction is 3.86 g.
What is limiting reagent?The limiting reagent is the reactant that is completely used up in a reaction, and thus determines when the reaction stops.
The limiting reagent is determined by balancing the chemical equation as follows;
H₂ + C₂H₄ --------> C₂H₆
From the reaction above;
1 mole of hydrogen gas = 1 mole of ethylene = 1 mole of ethane
2 g of hydrogen gas (H₂) = 30 g of ethane (C₂H₆)
0.61 g of H₂ = ? of C₂H₆
= (0.61 x 30)/2
= 9.15 g of C₂H₆
Thus, the maximum amount of ethane (C₂H₆) that can be formed is 9.15 g.
The formula for the the limiting reagent is H₂ because it will be completely used up.
2 g of H₂ = 28 g of C₂H₄ -
0.61 of H₂ = ?
= (0.61 x 28)/2
= 8.54 g
Excess mass of the ethylene that remains = 12.4 g - 8.54 g = 3.86 g
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materials used to make textile
Answer:
Animal wool (e.g., wool, silk)plant (e.g., cotton, flax, jute)mineral (e.g., asbestos, glass fibre)synthetic (e. g., nylon, polyester, acrylic)Explanation:
Many materials can be used in making textiles. The materials are mainly from animal, plant, mineral and synthetic sources. The examples are as follows;
Animal wool (e.g., wool, silk)plant (e.g., cotton, flax, jute)mineral (e.g., asbestos, glass fibre)synthetic (e. g., nylon, polyester, acrylic)Between Ar and H2O ( vapor) which gas deviates from ideal behavior and why? Justify your answer
Answer:
H2O
Explanation:
H2O should deviate from ideal behavior the most. Remember that an ideal gas has molecules which don't interact. Argon exists as an monoatomic element in the gas state, and the atom is neutral throughout. This means that two argon atoms only interact with each other through London dispersion forces or bumping. However, water is polar, so water molecules will attract each other strongly through permanent dipole-dipole interactions and hydrogen bonding. This means that water vapor deviates from ideal behavior the most
A 0.15M solution of methylamine CH3NH2 contains an unknown concentration of methylamine chloride CH3NH3Cl. If the solution has a pH of 10.20,what is the concentration of methylamine chloride in the solution? Kb for methylamine=4.6*10^-4
Answer:
0.43 M
Explanation:
The equation that should be used in this case would be:
pOH = pKb + log([A+]/[Base])
pKb = -log (4.6*10^-4) = 3.34
pOH = 14-10.2 = 3.8
[Base] = 0.15
3.8 = 3.34 + log x/0.15
0.46=log x/0.15
10^(0.46) = x/.15
x = 10^(0.46) * 0.15 = 0.43 M
how many sublevels in n=7
Answer:
7 sublevels (i think)
Explanation:
i will assume n is the principle quantum number, so the sublevels is l.
l can equal 0, 1, 2... all the way up to n-1, in this case, 7-1, or 6
This means the sublevels are:
0,1,2,3,4,5,6, for a total of 7 sublevels
How many moles of HCl are produced when 9.86 g of SOCl2 reacts? The balanced equation is:
SOCl2(ℓ)+H2O(ℓ)→SO2(g)+2HCl(g)
When cirrus clouds are above a deck of altocumulus clouds, occasionally a clear area, or “hole” will appear in the altocumulus cloud layer. What do you suppose cloud cause this to happen?
When cirrus clouds are above a deck of altocumulus clouds, occasionally a clear area, or “hole” will appear in the altocumulus cloud layer which is caused by supercooled water in the clouds suddenly evaporating.
What is a Cloud?This is referred to as a mass of condensed watery vapor which are floating in the atmosphere and results in precipitation due to continued condensation in the form of rain, snow etc.
There are different types of clouds and in a scenario where a clear area, or “hole” will appear in the altocumulus cloud layer then it is as a result of the supercooled water in the clouds suddenly evaporating and creating the space seen or observed.
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What mass of Mg will be produced when 126.9 g of K are reacted?
The balanced reaction is MgCl2 + 2K --> 2KCl + Mg
An ionic compound has the formula X3N2. Which one of the following groups is the element X on?
The element X in the ionic compound from the question belongs to group 2.
What is the ionic compound?An ionic compound is a compound that is formed when there is a combination of two or more atoms that are combined by the transfer of electrons. Now we know that the transfer of the electrons would give rise to the formation of to ions, a cation and an anion. The cation is the specie that lost electrons while the anion is the specie that gained the electrons. Thus the compound is composed actually of an ions pair that are necessarily of opposite charges from each other.
In this case, an ionic compound has the formula[tex]X_{3} N_{2}[/tex]. We can see that the element X has reacted with nitrogen to form a nitride and that the nitrogen has a subscript of 2 as shown.
The fact the nitrogen has a subscript of 2 shows that the element belongs to group 2.
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Which statement about subtatomic particles are true
The statement about sub-atomic particles that is true is:
Electrons are the subatomic particles with the smallest mass; option BWhat are sub-atomic particles?Sub-atomic particles refer to the smaller particles that are the constituents of atoms of elements.
There are three sub-atomic particles within a given atom,
The three sub-atomic particles are given below:
electrons -electrons are the negatively charged particles found outside the nucleus of an atom in electron shells or orbitals around the atom.protons - these are positively charged particles found inside the nucleus of an atom. The number of protons in an atom gives the atomic number of that atom.neutrons - these are neutral atoms found in the nucleus of atoms. The sum of the neutrons and protons in the nucleus of an atom gives the mass number of an atom. This is because the mass of an at is centered inside the nucleus since the proton and neutron have equal mass but the electron has negligible mass.Considering the given statements about the sub-atomic particles, the only true statement is that which describes the mass of the electron as being the smallest of the three sub-atomic particles.
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Complete question:
Which statement about subatomic particles is true?
Protons are the only subatomic particles to have a charge.
Electrons are the subatomic particles with the smallest mass.
Neutrons orbit the nucleus of the atom.
Subatomic particles all have the same mass