Answers
Answer:
Q8) True
Q9) First ionization energy
Q10) Metal oxides
Explanation:
A common property of group one elements (alkali metals) is their combination with water to form basic solutions. E.g 2K(s)+2H2O(l)→2KOH(aq)+H2(g).
The distance of the outermost electron in the atom from the nucleus is inversely related to the first ionization energy. As the distance between the outermost electron and the nucleus in group 17 elements gets larger, the corresponding first ionization energies of elements in the group gets smaller.
Group 1 elements can combine with oxygen to give metal oxides. E.g 4K + O2 --> 2 K2O
Related Questions
A chemist is studying the effect of acid rain on the steel in bridges. why would she most likely use rate laws in this s...
Answers
To see how the concentration of the acid would affect the rate at which the steel corroded
In the given question it is said that a chemist is studying the effect of acid rain on the steel in bridges and because of concentration of the acid it would affect the rate at which the steel corroded and in the corrosion of steel which is present in bridges is the electrochemical process that require the simultaneous presence of moisture and oxygen and acid rain is a form of precipitation with acidic component such as sulphuric acid or nitric acid that fall to the ground from the atmosphere in wet or dry form. and in the steel bridge when the acid rain is fall concentration of acid which is present on acid rain will effect the bridge and affect the rate at which the steel corroded
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How many atoms are in 100.0 grams of neon, Ne?
Answers
Answer: 20.179 grams
I had to do a project on this recently, so here is your answer!
Hope this is helpful!
Answer:
2.894 x 10²⁴ atoms Ne
Explanation:
To find the amount of neon atoms, you need to (1) convert grams to moles (using the atomic mass) and then (2) convert moles to atoms (using Avogadro's Number). It is important to arrange the ratios/conversions in a way that allows for the cancellation of units (the desired unit should be in the numerator of the ratios in this case). The final answer should have 4 sig figs like the given value (100.0 = 4 sig figs).
Atomic Mass (Ne): 20.180 g/mol
Avogadro's Number:
6.022 x 10²³ atoms = 1 mole
100.0 g Ne 1 mole 6.022 x 10²³ atoms
-------------------- x ----------------- x ------------------------------- = 2.894 x 10²⁴ atoms
20.180 g 1 mole
A 3.00- L flask is filled with gaseous ammonia, NH3 . The gas pressure measured at 25.0 ∘C is 2.55 atm . Assuming ideal gas behavior, how many grams of ammonia are in the flask?
Express your answer to three significant figures and include the appropriate units.
Answers
Considering the ideal gas law, the mass of ammonia is 5.321 grams.
Ideal gas lawAn ideal gas is a theoretical gas that is considered to be composed of randomly moving point particles that do not interact with each other. Gases in general are ideal when they are at high temperatures and low pressures.
An ideal gas is characterized by three state variables: absolute pressure (P), volume (V), and absolute temperature (T). The relationship between them constitutes the ideal gas law, an equation that relates the three variables if the amount of substance, number of moles n, remains constant and where R is the molar constant of gases:
P×V = n×R×T
Mass of ammoniaIn this case, you know:
P= 2.55 atmV= 3 Ln= ?R= 0.082 [tex]\frac{atmL}{molK}[/tex]T= 25 C= 298 KReplacing in the definion of ideal gas law:
2.55 arm× 3 L = n×0.082 [tex]\frac{atmL}{molK}[/tex]× 298 K
Solving:
n= (2.55 arm× 3 L)÷ (0.082 [tex]\frac{atmL}{molK}[/tex]× 298 K)
n= 0.313 moles
Being the molar mass of ammonia 17 g/mole, the mass can be calculated as:
mass of ammonia= 0.313 moles× 17 g/mole
Solving:
mass ammonia= 5.321 g
Finally, the mass of ammonia is 5.321 grams.
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a quarter made predominantly of silver (density=10.5 g/mL), was determined to have a mass of 6.25g. what is the volume of the quarter?
Answers
Taking into account the definition of density, the volume of the quarter is 0.5952 mL.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space and it is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is the quotient between the mass of a body and the volume it occupies:
density= mass÷ volume
Volume of the quarterIn this case, you know that:
Density= 10.5 g/mLMass= 6.25 gReplacing in the definition of density:
10.5 g/mL= 6.25 g÷ volume
Solving:
10.5 g/mL× volume= 6.25 g
volume= 6.25 g÷ 10.5 g/mL
volume= 0.5952 mL
In summary, the volume of the quarter is 0.5952 mL.
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Rounding off 0.072251 to four significant figures
Answers
0.072251
Explanation:
The Sig Figs would be 5 (0.072251)
In Decimals 6 (0.072251)
Scientific Notation 7.2251 × 10-2
E-Notation 7.2251e-2
A 1.0 mole sample of fluorine gas at 25 °C has an average molecular velocity of 415 m/s. What is the total KE of the gas sample? Report your answer in kilojoules to the nearest tenth.
Answers
The total kinetic energy of the gas sample is 3.3 KJ
What is kinetic energy?This is the energy possessed by an object in motion. Mathematically, it can be expressed as:
KE = ½mv²
Where
KE is the kinetic energy m is the mass v is the velocity How to determine the mass of the fluorine gasMolar mass of fluorine gas = 38 g/molMole of fluorine gas = 1 moleMass of fluorine gas = ?Mass = mole × molar mass
Mass of fluorine gas = 1 × 38
Mass of fluorine gas = 38 g
How to determine the KE of the gas sampleMass (m) = 38 g = 38 / 1000 = 0.038 KgVelocity (v) = 415 m/sKinetic energy (KE) =?KE = ½mv²
KE = ½ × 0.038 × 415²
KE = 3272.275 J
Divide by 1000 to express in kilojoule
KE = 3272.275 / 1000
KE = 3.3 KJ
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Calculate the mass of water produced when 1.23 g of butane reacts with excess oxygen.
Answers
The mass of water is 1.89g
Mass is a measure of the amount of matter that an object contains
Here given data is 1.23 g of butane reacts with excess oxygen and the reaction is
C₄H₁₀ + 13/2 O₂ →4CO₂ + 5H₂O
Mole of butane = 1.23/58.12g/mol⁻¹
Mole of butane = 0.021mol
We assume complete combustion, and know that each mole of butane gives off 5 mol of water upon combustion.
We know the molar quantity of butane then
5×0.021×18.01 = 1.89g
Mass of water is 1.89g
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Question Completion Status:
PUESTIVITY
Refer to Activity 2 in Lab 3A to answer the question below
Two amino acids are shown below in the process of forming a peptide bond (labeled). The hydroxyl (-OH circled in red) is being removed from the carboxyl group of the first amino acid. A hydrogen
atom (-H circled in red) is being removed from the amine group from the second amino acid. The removed -OH and -H will form water (H20)
Question
What chemical reaction takes place when water is removed to form a bond (as is being shown below)?
Answers
Explanation:
Refer to Activity 2 in Lab 3A to answer the question below
Two amino acids are shown below in the process of forming a peptide bond (labeled). The hydroxyl (-OH circled in red) is being removed from the carboxyl group of the first amino acid. A hydrogen
atom (-H circled in red) is being removed from the amine group from the second amino acid. The removed -OH and -H will form water (H20)
Question
What chemical reaction takes place when water is removed to form a bond (as is being shown below)?
What is the frequency of the wave shown below assuming it is light (electromagnetic radiation)?
4.17 x 107 m
Answers
The frequency of the wave assuming it is light having compete distance as 4.17×10^7 m is 1.44×10^15 Hz
Wavelength:- It is defined as the distance between the two Consecutive Crest or trough. OR distance travelled by the wave to Complete one Complete Cycle.
The distance for completing two cycle is 4.17×10^7 m
so 2λ=4.17×10^7m
λ=2.085×10^-7m
Also f=c/λ
f=3×10^8/2.085×10^-7
f=1.44×10^15 Hz
A waveform signal that is carried in space or down a wire has a wavelength, which is the separation between two identical places (adjacent crests) in the consecutive cycles is wavelength.The number of cycles or vibrations that a body in periodic motion experiences during one unit of time, as well as the number of waves that pass a given point in a unit of time is frequency.To learn more about frequency visit:
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the NCC Libraries
What atoms listed below would form a covalent bond with each other?
-F (fluorine) and K (potassium)
-C (carbon) and Cl (chlorine)
-Ag (silver) Cu (copper)
-Ag (silver) and Br (bromine)
-Na (sodium) and Mg (magnesium)
Answers
Answer: F,C,NA
Explanation:
bc it is
Which is the MOST important safety measure to follow when using an acid in a classroom laboratory?
Answers
The most important safety measure to follow when using an acid in a classroom laboratory is wearing gloves, wear face shield and protective clothing etc
On performing experiments in a lab, then it is necessary to follow the instructions of the teacher and safety measures thoroughly so that any accident will not lead to any a major injury kind. Wearing gloves, goggles, and other safety gear is the minimum requirement for doing an experiment while the teacher is not present. protective clothing.To guarantee appropriate protection from concentrated acid spills, you must wear a face shield over your safety glasses, nitrile gloves (if available), and neoprene aprons.To learn more about face shield visit:
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All of the following changes to a metal are physical changes except
A: polishing
B: bending
C: melting
D: rusting
Answers
Ions are particles that have a different number of protons and ____. Ions are electrically charged. Ions can be formed when a metal reacts with a Non-metal. Metal atoms ____ electrons to form ____ ions. Non metals ____ electrons to form _____ions.
Answers
Ions are simply referred to as electrically charged atoms. Ions are formed when atoms lose or gain electrons to become positively or negatively charged.
Positively charged atoms are called cations (+) while negatively charged atoms are called anions (-).
According to this question, ions are electrically charged that can be formed when a metal reacts with a non-metal.
Metals like calcium, pottasium etc. lose electrons to form positive ions or cations while non-metals such as nitrogen, oxygen etc gain electrons to form negative ions or anions.
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How many atoms are in 1.50 moles of lithium, Li?
Answers
Answer:
1 LITHIUM= 6.022140857×1023 atoms
0.50 LITHIUM = 3.01 × 102^3
ADD THEM TOGETHER AND YOU GET YOUR ANSWER.
Explanation:
Question 3 of 10
What is nuclear fission?
Answers
Answer:
Nuclear fission is a reaction in which the nucleus of an atom splits into two or more smaller nuclei. The fission process often produces gamma photons, and releases a very large amount of energy even by the energetic standards of radioactive decay
some scientific tools are used for making observations,and others are used for making measurements. whivh of these tools would be most useful for observing the behavior of ants? is it A.hands lens. b.metric ruler. C.electronic balance D.graduated cylinder,And explain .
Answers
Based on the diagram where are hydrogen ions found within chloroplast?
Answers
The hydrogen ions build up in high concentration in the lumen of the thylakoid. They pass through an enzyme called ATP synthase, and their movement provides the energy needed to add a third phosphate to ADP (adenosine diphosphate) to form ATP (adenosine triphosphate).
might be a b
Answer:Other dude is right I just took the quiz.
Its B
Explanation
A 10.4 g sample of CaSO4 is found to contain 3.06 g of Ca and 4.89 g of O. Find the mass of sulfur in a sample of CaSO4 with a mass of 65.8 g.
Answers
The mass of sulfur in a sample of CaSO4 with a mass of 65.8 g is 15.50g.
How to calculate mass of an element in a compound?According to this question, a 10.4 g sample of CaSO4 is found to contain 3.06 g of Ca and 4.89 g of O.
This means that the mass of sulfur in the 10.4g of CaSO4 is 10.4g - (3.06g + 4.89g) = 10.4g - 7.95g = 2.45g
Next, we calculate the percent ratio of each element in the compound; CaSO4.
Ca = 3.06g/10.4g × 100 = 29.42%S = 2.45g/10.4g × 100 = 23.56%O = 4.89g/10.4g × 100 = 47.02%According to this question, a sample of CaSO4 with a mass of 65.8 g is given. The mass of each element in this compound is as follows:
Ca = 29.42/100 × 65.8g = 19.36gS = 23.56/100 × 65.8g = 15.50gO = 47.02/100 × 65.8g = 30.94gTherefore, the mass of sulfur in a sample of CaSO4 with a mass of 65.8 g is 15.50g.
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Li+ has larger radius than Li true or false
Answers
Answer:
true I believe
Explanation:
How many O atoms are present in sodium chlorate?
6
1
3
4
none of the above
Answers
Answer:
3.
Explanation:
Sodium chlorate has the formula NaClO3. We know this because sodium is Na, chlorine is Cl, and because of naming rules. When a compound ends in -ate, it has 3 oxygen atoms. This is the naming rule list with chlorine as the example:
perchlorate: 4 O atoms
chlorate: 3 O atoms
chlorite: 2 O atoms
hypochlorite: 1 O atom
A classical radio station broadcasts at 93.5 MHz. Find the wavelength of this radiation, in meters, and the energy of one of these photons, in J
Answers
E=6.20*10^-26 J photons
Which statements are true about balancing chemical equations?
Check all that apply.
A. Balancing chemical equations does not involve trial and error.
B. Balancing chemical equations involves trial and error.
C. Atoms that are in only one of the reactants and only one of the
products should be done last.
D. Single atoms should be done last.
Answers
Answer:
statement C is the correct answer
The image compares the arrangement of electrons in two different neutral atoms.
A shaded sphere is shown at the center of four concentric circles. The innermost circle has two black spheres. The middle circle has eight black spheres. The outermost circle has one black sphere. To the right of this figure labeled Atom D is another figure labeled Atom E. Atom E has a shaded sphere at the center of four concentric circles. The innermost circle has two black spheres. The second and the third circles have eight black spheres each. The outermost circle has one black sphere.
Which of the following best explains the position of the two atoms in the periodic table?
a
Both atoms have an estimated Zeff of 1; therefore, Atom D is to the right of Atom E in the same period.
b
Both atoms have Zeff of 1; therefore, Atom D is above Atom E in the same column because of the additional energy level.
c
Atom D has an estimated Zeff of 1 and is therefore to the left of Atom E, which has a Zeff of 9.
d
Atom D has an estimated Zeff of 1 and is therefore below Atom E in the same column, which has a Zeff of 9.
Answers
The correct answer is option b) Both atoms have Zeff of 1; therefore, Atom D is above Atom E in the same column because of the additional energy level.
The term "Zeff" refers to the effective nuclear charge, which is equal to the atomic number (number of protons) less the core electrons (all the electrons less the valence electrons).
Zeff = no. of protons - no. of core electrons
Now, each circle in the image indicates a distinct energy level, with rising energy as one moves away from the nucleus. Since atom D has fewer energy levels than atom E, hence, it is placed above atom E in the periodic table.
Furthermore, according to the trends of the periodic table, atoms with the same number of valence electrons will be in the same column. Since atoms D and E both have a single valence electron. Hence, they are in the same column and have the same Zeff of 1.
Therefore, both atoms have Zeff values of 1, and Atom D is positioned above Atom E in the same column due to the additional energy level in atom E.
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Does a small standard deviation mean that the results of the experiment were successful?
True or False
Answers
Answer: Ture
Explanation: A small standard deviation means that the data is more clustered around the mean (More reliable).
the length of a soccer field; 120. m (three significant figures), to inches
given the following equivalences:
1 in 2.54 cm
=
1 ft = 12 in
Answers
When we convert 120 meter to feet we obtain 393.6 feet.
How do you convert from meter to feet?Unit conversions is very important in science. It is important that we are able to express a value in different units as this is able to ease the process of making calculations.
We know that;
1 meter = 3.28 foot
120 meter = 120 meter * 3.28 foot/1 meter
= 393.6 feet
Thus, when we convert 120 meter to feet we obtain 393.6 feet.
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Drag each tile to the correct box. Based on your observations in this task, rank the three types of substances according to the strength of the forces between particles, from weakest to strongest. Tiles polar substancesnonpolar substancesionic substances Sequence <
Answers
Intermolecular force is the force of attraction that holds the particles in the atom together. The force referred to in the question is the force that binds the various elements together when they come together.
The intermolecular forces presented in the answer options in order of strength to weakness are ion-dipole hydrogen bonds dipole-dipole and van der Waals forces. The dipole-dipole interaction is the strongest intermolecular attraction. These are the weakest intermolecular forces and exist between all types of molecules, whether ionic or covalent, polar or non-polar.
Solids usually have the strongest intermolecular forces compared to liquids and gases. In solids, they are incompressible and dense because the particles are close together. The weakest intermolecular force is the London dispersion force. London Dispersion Force The London dispersion force is also known as the induced dipole induced dipole because it is a temporary attractive force that generates a temporary dipole. London dispersion exists in nonpolar monatomic gases.
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Answer:
nonpolar substance < polar substance < ionic substance
Explanation:
Answer key
A chemist encounters an unknown metal. They drop the metal into a graduated cylinder containing water, and find the volume change is 4.1 mL. If the metal weighs 4.5 g, what is the density of the metal in g / m * L ?
Answers
Taking into account the definition of density, the density of the metal is 1.097 g/mL.
Definition of densityDensity is defined as the property that matter, whether solid, liquid or gas, has to compress into a given space.
In other words, density is a quantity that allows us to measure the amount of mass in a certain volume of a substance.
The expression for the calculation of density is:
density= mass÷ volume
From this expression it can be deduced that density is inversely proportional to volume: the smaller the volume occupied by a given mass, the higher the density.
Density in this caseIn this case, you know that:
Mass= 4.5 gVolume= 4.1 mLReplacing in the definition of density:
density= 4.5 g÷ 4.1 mL
Solving:
density= 1.097 g/mL
In summary, the density of the metal is 1.097 g/mL.
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40 POINTS!!!
Listed in the Item Bank are key terms and expressions, each of which is associated
with one of the columns.
Choose the number associated with Extensive or Intensive
for each characteristic in the column. Order does not matter.
Extrinsic properties (also called extensive) are directly related to the amount of
material being measured.
Intrinsic properties (also called intensive) are those which are independent of the
amount of matter present.
Volume
Density
Mass
Temperature
Length
Melting Point
Color
Boiling Point
Luster
Answers
Answer:
ddddddfrvtrnsyjemn
Explanation:
dddddddddddd
look at the screenshot
2.4.5 x 10³ dm³ to m³
Answers
Answer:
The conversion factor is 0.001; so 1 cubic decimeter = 0.001 cubic meters. In other words, the value in dm3 divide by 1000 to get a value in m3.
Explanation:
Does C2H6O dissociate in an aqueous solution? How can you tell?
Answers
C2H6O is ethanol which is easily dissociate in aqueous solution because ethanol is easily soluble in water.
What is aqueous solutions?
Aqueous solution is defined as a solution in which the solvent is water.
Example of aqueous solution are cola, salt water, base solution, salt solution etc., are some of the example of aqueous solution.
Non aqueous solution is defined as a solution obtained by dissolving solute in any liquid other than water.
Example of non aqueous solutions are ethene in dichloromethane and Sulphur in carbon disulphide etc. are some of the example of non aqueous solution.
Thus, C2H6O is ethanol which is easily dissociate in aqueous solution because ethanol is easily soluble in water.
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