The family (group) of elements that have a valence-level electron configuration of 1 are alkali metals. Hence, the answer is option C.
A group or family in the periodic table consists of all the elements arranged in a single vertical column. There are eighteen groups in total. Elements in the same group tend to have the same chemical properties because they contain the same number of electrons in their outermost shells (valence electrons).
Elements in the first group or group 1 have only one electron in their outermost shell. They are known as alkali metals. They are called alkali metals because they react with water to form bases or alkali. These metals must be stored under oil as they are very reactive and easily react with air and water.
Alkali metals are also very electropositive and form ions by giving out their one valence electron, carrying a charge of +1. The three alkali metals are Lithium (Li), Sodium (Na) and Potassium (K), with Potassium being the most electropositive.
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why does water not dissolve in water
Answer:
Water dissolves with water because both are polar solvents
[tex].[/tex]
A chemist heats a 215-g sample of iron from 25.0°C to 90.0°C. How much heat did the iron absorb? The
specific heat capacity of iron is 0.45 J/g°C.
A 215-g sample of iron is heated by a chemist from 25.0°C to 90.0°C and 6.3 kJ of heat are absorbed by the iron (q).
What is meant by specific heat?Also known as specific heat, this is the quantity of energy required to increase a substance's temperature by 1 degree Celsius in one gram. The units of specific heat are typically calorie or joules a gram per degree Celsius. As an illustration, the specific heat of water is 1 calorie (4.186 joules) each gram per degrees C.
Briefing:q = m × C × ΔT
q = m × C × (T[tex]_f[/tex] - T[tex]_i[/tex]),
q is the quantity of heat energy a substance gains or loses (J)
m = mass of sample (g)
C = specific heat capacity (J °C-1 g-1)
T[tex]_f[/tex] = final temperature (°C)
T[tex]_i[/tex] = initial temperature (°C)
Thus:
q = (215 g) × (0.45 J oC-1 g-1) × (90 - 25)°C
q = 6288.75 J
q = 6288.75 J = 6.3 kJ
The iron absorb 6.3 kJ of heat (q).
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What is the formula for Newtons second law of motion 
Answer: F=m*a
Explanation: Force equals mass times acceleration!
I hope this helps!
Please share the answers with explanations
Thanks,
The melting and boiling and density is given below :
Substance melting point / °C boiling point / °C density / g cm⁻³
E -259 -253 0.09
F 1085 2580 8.93
G -7 59 3.1
H -39 357 13.6
I -218 - 183 0.0013
A) substances are gases at room temperature:
E and I are gases at room temperature because the melting and boiling point are below at room temperature.
B) substances are liquids at room temperature:
G and H are liquids at room temperature because substances are liquid at room temperature if melting point is below room temperature and boiling point is above room temperature.
C) substances are solid at room temperature :
F is solid at room temperature because its melting point is above room temperature.
D) substances are most likely to be metal :
F is metal because metals have very high melting and boiling point except mercury.
E) substance are most likely to be mercury :
H is most likely to be mercury because mercury has boiling point -38°C and melting point is 356°C and density is 13.5 g/ cm³ and mercury is metal with exception.
G) substances will be liquid at -210°C :
I is liquid at -210°C because substance is liquid when its melting point is below temperature and boiling point is above temperature.
H) substances are most likely to be bromine :
G is more likely to be bromine because melting and boiling point and density of G is close to bromine.
I) substances which are least dense non metal :
E is least dense non metal because its melting and boiling point and density is close to least dense non - metal.
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In the equation below, carbon dioxide and water react to make sugar and oxygen. This reaction (photosynthesis) takes place inside plants and is the basis for almost all life on Earth.
6CO2 + 6H2O → C6H12O6 + 4O2
How many molecules of carbon dioxide are involved in this reaction? ______
How many molecules of sugar are produced in this reaction? ______
6 CO2 molecules are involved in this reaction which is in turn helping to produce 1 molecule of glucose.
How many molecules in total are there in photosynthesis?Commonly used notation for photosynthesis is: 6CO2 + 6H2O C6H12O6 + 6O2. This suggests that the transformation of the reactants—six carbon dioxide molecules and six water molecules—into the products—a sugar molecule and six oxygen molecules—takes place as a result of chlorophyll's absorption of light energy.How does CO2 function in photosynthesis?During photosynthesis, plants take up water (H2O) and carbon dioxide (CO2) from the soil and atmosphere.Water is oxidized, which means it loses electrons, while carbon dioxide is reduced, which means it receives electrons, inside the plant cell. This mechanism transforms water into oxygen and carbon dioxide into glucose.To learn more about photosynthesis visit:
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For the reaction 4ch3ch3 14no2, the rate of the reaction in terms of the change in nitrogen concentration would be written as:___________
For the reaction 4ch3ch3 14no2, the rate of the reaction in terms of the change in nitrogen concentration would be written as:+ (2/3) Δ[H2O]/Δt.
What is nitrogen ?The chemical element with the atomic number 7 and the letter N is known as nitrogen. The lightest element in group 15 of the periodic table, often known as the pnictogens, nitrogen is a nonmetal. It is a typical element in the cosmos, believed to be eighth in the Milky Way and the Solar System in terms of overall abundance. Two of the element's atoms combine to generate N2, an odorless and colorless diatomic gas, under standard pressure and temperature.
The majority of the atmosphere on Earth is made up of N2, making it the most prevalent uncombined element. All living things contain nitrogen, which is principally found in the amino acids that make up proteins, the nucleic acids that make up DNA and RNA, and the energy-transfer molecule adenosine triphosphate.
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An object with a mass of 1072 g
measures 6 cm wide, 7.3 cm high
and 15.2 cm long. What is the
density of the object?density
The Density of the given object is 1.61gm/cm³.
How closely a material is packed together is determined by its density. It is defined as the mass per unit volume.Volume is the cubic measurements used to determine how much space a three-dimensional object takes up.formula of volume : V = l × w × hUnit of density is g/cm³ or kg/m³ and unit of volume is cm³ or m³ or mL or L.Given,
mass of the object = 1072g
Length of the object = 15.2 cm
width of the object = 6 cm
height of the object = 7.3 cm
Therefore volume of the object V = l × w × h
V = 15.2 × 6 × 7.3
= 665.76 cm³
As we know,
Density = Mass / Volume
Density = 1072 / 665.76
= 1.61 g/cm³
Therefore, the density of given object is 1.61 g/cm³.
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Which organic reagents would you need to make 2-ethylheptanoic acid from diethyl malonate?
The reagents need for the formation of 2-ethyl heptanoic acid are Bromoethane, 1-bromopentane, sodium ethoxide, and potassium tert-butoxide.
When the bromoethane reacts with the diethyl malonate it formed the diethyl 2,2 - diethylmalonate.Bromoethane is an alkylating agent and used in substitution reaction and add alkyl group to the compound. 1-bromopentane carried out the elimination reaction.sodium ethoxide helps in extraction of hydrogen from the compound formed the negative on the compound. potassium tert-butoxide is strong non- nucleophile base which as strong as other bases. it is participating in nucleophilic addition reaction.it follows the SN 2 reactions and also participates in the dehydrohalogenation reaction.All the above reagents are used for the preparation of 2- ethyl heptanoic acid from diethyl malonate.All the above reagents are used for the preparation of 2- ethyl heptanoic acid from diethyl malonate.
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Which of the following scenarios could be considered evidence of a compound with a low activation energy?
A. a high amount of naturally occurring NaCl
B. a low amount of spontaneous fuel combustion
C. a low amount of collisions between molecules
D. a high amount of heat required to form products
A high amount of naturally occurring NaCl is considered evidence of a compound with a low activation energy and is denoted as option A.
What is Activation energy?This is referred to as the minimum amount of energy which is needed for a chemical reaction to occur and is dependent on various factors.
A compound which has a low activation energy will have a high yield sue to the ease in which the reactants are being converted into products. in this scenario, the high amount of naturally occurring NaCl signifies a low activation energy which is why option A was chosen as the correct choice.
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Question 20
What element is represented in the following notation [Ne] 3s² 3p4
OS
OC
O Mg
O AI
<< Previous
5 p
Answer: S
:) hope this helps you!
What is the proper solution to the following
equation?
(150. + 2.5+ 36.75) ÷ (6.60+ 0.173)
=
A)30
B)27.94
C)28
D)27.942
E) 27.9
Answer:
B) 27.94
Explanation:
All other last digits are wrong except b
Answer:
[tex] \frac{39.25 + 150.}{6.773} = 27.94182[/tex]
Explanation:
[tex]1. \: (39.25 + 150.) \div (6.60 + 0.173) \\ 2. \: (39.25 + 150.) \div 6.773 \\ 3. \: (39.25 + 150.) \times \frac{1}{6.773} \\ 4. \: \frac{(39.25 + 150.) \times 1}{6.773} \\ 5. \: \frac{39.25 + 150.}{6.773} = 27.94182[/tex]
Which of the following science and engineering practices describes one the first things that scientists do when starting a new investigation?
A) Constructs an Explanation
B) Interprets data
C) Designs a solution
D) Ask a question
Ask a question the first things that scientists do when starting a new investigation.
What are scientific practices?Scientific practices, which include things like answering questions, creating and using models, and having arguments, are cognitive, discursive, and social activities carried out in science classrooms with the goal of developing epistemic understanding and appreciation of the nature of science.
Why are the science and engineering practices important?Participating in these activities not only makes students' knowledge more meaningful and deeply ingrained in their worldview, but it also aids them in developing an understanding of the disciplinary and transdisciplinary ideas of science and engineering.
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How do firefighters use their knowledge of the fire triangle to help them control fires? how do the measures they take relate to the chemistry involved?.
Answer:
okay
Explanation:
The fire triangle's three sides illustrate the three elements of fire: heat, fuel and oxidization. The three elements must be combined in the right proportions for a fire to occur. If any of the three elements are removed, the fire is extinguished
Calculate the molality of a solution containing 15.01 g of glycerol (c 3h 8o 3) in 42.3 g of ethanol (c 2h 5oh).
The molality of the glycerol solution is 3.854mol/kg
The number of moles of solute present in a solution equal to 1 kg or 1000 g of solvent is referred to as its molality.
Given:
Mass, m1 of glycerol = 15.01g
Mass, m2 of ethanol = 42.3g
Molar mass, mm1 of glycerol = 92.095g/mol
Molar mass, mm2 of ethanol = 46.069g/mol
To find:
Molality, m = ?
Formula:
Molality, m = moles of solute / kg of solvent
Calculations:
No. of moles of glycerol = 15.01 x (1/92.095)
n = 0.163 mols
Molality, m = 0.163 / 0.0423g
Molality, m = 3.854mol/kg
Result:
3.854mol/kg is the molality of the glycerol solution.
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Why would a baseball team hire a physicist?
A. To design a stadium with the maximum number of seats
B. To make the team uniforms more comfortable
C. To work on the mechanics of a pitcher's throw
D. To inspect the balls for defects
Answer:
C. To work on the mechanics of a pitchers throw
or... A. To design a stadium with the maximum number of seats
Explanation:
What mass of ammonia is formed when 5.36 g of nitrogen gas reacts with excess hydrogen gas?
6.508 g mass of of NH3 is formed when 5.36 g of nitrogen gas reacts with excess hydrogen gas.
N2 + 3 H2 → 2 NH3
The molar mass of N2 is 28.0 g/mol. The molar mass of NH3 is 17 g/mol.
To find the mass of NH3:
=5.36 x 2 x (17 / 28)
=182.2 / 28
= 6.508 g
The mass of ammonia is 5.36 g.
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When h2so4 is neutralized by naoh in aqueous solution, the net ionic equation is ________.
When H₂SO₄ is neutralized by NaOH in an aqueous solution, the net ionic equation is:
2H⁺(aq) + 2OH⁻(aq) → 2H₂O(l)
A chemical equation known as an ionic equation expresses the electrolytes in an aqueous solution as dissociated ions. For the reaction between [tex]H_{2}SO_{4}[/tex] , NaOH that neutralizes it, we must write the net ionic equation.
The reaction's equilibrium chemical equation is:
[tex]Na_{2} SO_{4}[/tex](aq) + [tex]2H_{2}O[/tex] = [tex]H_{2}SO_{4}[/tex] (aq) + [tex]2NaOH[/tex](aq) (l)
We shall now draft the ionic equation.
The reaction's ionic equation is
[tex]2 Na ^{+} (aq) + SO_{4} ^{2-} (aq) + 2H_{2}O = 2H^{+} (aq) + SO_{4} ^{2-} (aq) + 2 Na ^{+} (aq)+ 2OH(aq) (l)[/tex]
The net ionic equation is then obtained by canceling out the spectator ions Na+ and SO42.
The neutralization reaction's net ionic equation is:
2H⁺(aq), 2OH⁻(aq), and 2H₂O (l)
In light of this, the net ionic equation for the neutralization of H2SO4 and NaOH is:
2H⁺(aq) + 2OH⁻(aq) → 2H₂O(l)
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A 6.67 mg sample of a compound containing carbon, hydrogen, and oxygen underwent combustion producing 15.17 mg of CO2 and 6.19 mg of H2O. What is the empirical formula of the compound? (Type your answer using the format CxHyOz for the compound CxHyOz)
The empirical formula of the compound is C₃H₆O
What is the empirical formula of the compound?The empirical formula is determined as follows from the equation of the reaction as follows:
CxHyOz + O₂ → x CO₂ + y/z H₂Omass of CO₂ produced = 15.17 mg = 0.01517 g
moles of C in the sample = 0.01517/44 = 0.000344 moles
mass of C in the sample = 0.0000344 * 12 = 0.00413 g
mass of H₂O produced = 6.19 mg = 0.00619 g
moles of H in the sample = 0.00619/18 * 2 = 0.000688 moles
mass of H in sample = 0.000688 g
mass of oxygen in the sample = 0.00667 g - (0.00413 g + 0.000688 g)
mass of oxygen in the sample = 0.00185
moles of oxygen = 0.00185/16 = 0.000116
Ratio of C : H : O = 0.000344 : 0.000688 : 0.000116
Ratio of C : H : O = 3 : 6 : 1
Empirical formula of compound = C₃H₆O
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determine the number of moles of methane in 120cm³ of the gas at r.t.p
Answer:
0.005 moles
Explanation:
120cm^3 = 0.12dm^3
1mol is always 24dm^3 of gas at rtp
0.12 ÷ 24 = 0.005 moles
What is the name given to an ion that has lost electrons? someone help me please D:
The name given to an ion that has lost electrons is cation. Details about cations can be found below.
What is a cation?A cation is a positively charged ion i.e. the one that would be attracted to the cathode in an electrolytic procedure.
Generally, an ion is an electrically charged atom. An ion can either be positively charged or negatively charged. The latter is called an anion while the former is called a cation.
A cation is formed when an atom loses electrons to become positively charged while an anion is formed when an atom accepts electrons to become negatively charged.
Therefore, it can be said that the name given to an ion that has lost electrons is cation.
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A rectangular block of copper metal weighs 1996 g. The dimensions of the block are 9.4 cm by
6.5 cm by 5.6 cm. From this data, what is the density of copper? (hint: find the volume of a block
first)
Describe scientific method
The scientific method is an experimentation technique used to investigate data and answer questions. All sciences, including chemistry, physics, geology, and psychology, follow the scientific method. These scientists ask various questions and conduct different tests. They do, however, apply the same fundamental technique to arrive at logical and evidence-based conclusions. Scientists change the scientific method when direct experimentation is not possible. Understanding the phases of the scientific process can assist you in focusing your scientific inquiry and working through your observations and data to get the best possible response.
The scientific method consists of seven phases.
1. Pose a query. The scientific approach begins with posing a question that you want answered.
2. Conduct research.
3. Create your theory.
4. Experiment to put your hypothesis to the test.
5. Make a note of it.
6. Analyze the findings and reach a conclusion.
7. Display your results.
Uranium has three isotopes with the following percent abundances: 234- (0.0058%), 235- (0.71%), 238- (99.23%). Without doing any calculations, what do you expect the atomic mass of uranium to be in whole numbers. Why?
Answer:
Because it is the same element but has different atomic mass
why do we say the partials in a rock lying on the ground have kinetic energy and potential energy
Answer:
All particles of matter are always in constant motion. In this case, the particles of the rock possess kinetic energy as they vibrate in place. However, the particles also contain potential energy due to their position and arrangement. This form of stored energy is responsible for keeping the particles bonded together.
Explanation:
When a 7.55-mg sample of a compound containing carbon is burned completely, 17.3 mg of carbon dioxide is produced. what is the mass percentage of carbon in the compound?
There ought to be 6.3 grams of oxygen reacting with the fuel in accordance with the law of conservation of matter.
Fuel mass equals 20.8 grams
In the presence of oxygen, 9.8 grams of CO2 and 17.3 grams of water are generated.
The mass of the products and reactants of a chemical reaction must be equal, in accordance with the law of conservation of mass.
In other words, mass fuel plus mass oxygen equals mass carbon dioxide plus mass water.
9.8 grams of carbon dioxide per mass.
17.3 grams of water in mass
27.1 grams of mass CO2 plus water.
The fuel's mass is 20.8 grams.
This indicates that the mass of the oxygen should be 27.1 grams in addition to the mass of the fuel.
Mass oxygen is equal to 27.1 - 20.8 grams= 6.3 grams.
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How many grams of methanol (ch3oh) must be added to water to prepare 191.8 ml of a solution that is 6.72 m methanol?
41296.22 g of weight of methanol (ch3oh) must be added to water to prepare 191.8 ml of a solution that is 6.72 m methanol
Molarity of reactions happen in solutions and so it is important to understand how the amount of substance is expressed when it is present in the solution. It is one of the most widely used unit of concentration and is denoted by M. It is defined as no. of moles of solute present in 1 liter of solution. Thus, it define as N = n /VIt is given that 191.8 ml of 6.72 M methanol is to be prepared.
Using the Molarity formula , we get
6.72 = n / 191.8
n = 6.72 × 191.8
n = 1288.89 g / mol
Molar mass of methanol = 32.04g/mol
Weight of methanol to be added= 32.04 ×1288.89 = 41296.22 g
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Use the table below to calculate the atomic
mass of element X. Then use the periodic table
to identify the element. Show all your work.
To determine the molar mass of an unknown from the freezing point depression, the freezing points of both the pure solvent and the solution need to be measured.
Yes, to determine the molar mass of an unknown solute from the freezing point depression the freezing points of both the pure solvent and the solution need to be measured.
The depression of the freezing point is a and it is given by the following formula,
ΔT f = T°f - T f
Here T°f is the freezing point of pure solvent
T f is the freezing point of the solution made by adding non-volatile solute to solvent
The freezing point depression is directly proportional to the molality of the solution
T(f) ∝ m
T(f)= K f x m
Here K f is the proportionality constant.
Hence, to determine the molar mass of an unknown solute from the freezing point depression the freezing points of both the pure solvent and the solution need to be measured.
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Each of the following pairs of elements will react to form an ionic compound. Write the formulas and name these compounds: (a) barium and oxygen, (b) calcium and phosphorus, (c) aluminum and sulfur, (d) lithium and nitrogen
(a) barium and oxygen - Braium oxide ([tex]BaO[/tex])
(b) calcium and phosphorus - Calcium phosphate - ([tex]Ca_{3}(PO_{4})_{2}[/tex])
(c) aluminum and sulfur - Aluminum Sulfide [tex]Al_{2}S_{3}[/tex]
lithium and nitrogen - Lithium nitride [tex]Li_{3} N[/tex]
What is an ionic compound?The term ionic compound refers to a compound that is formed when ions are combined together. We know that ionic compounds are crystalline and that they are also soluble in water and polar solvents. Most importantly, the ions are arranged in a very definite pattern.
Now let us see the names of the compounds formed by each pair;
(a) barium and oxygen - Braium oxide ([tex]BaO[/tex])
(b) calcium and phosphorus - Calcium phosphate - ([tex]Ca_{3}(PO_{4})_{2}[/tex])
(c) aluminum and sulfur - Aluminum Sulfide [tex]Al_{2}S_{3}[/tex]
lithium and nitrogen - Lithium nitride [tex]Li_{3} N[/tex]
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Sodium is an example of an ________ metal that reacts with water to form hydrogen gas and an ________ solution.
Sodium is an example of an alkali metal that reacts with water to form hydrogen gas and an alkaline solution.
Alkaline metals are lithium, sodium (Na), rubidium, potassium, cesium. They have low ionization energy and lose one electron very easy.
Atomic number of sodium is 11, it means that it has 11 protons and 11 electrons, so atom of sodium is neutral.
Electron configuration of the sodium atom: ₁₁Na 1s² 2s² 2p⁶ 3s¹.
Balanced chemical equation for the reaction of sodium with water:
2Na + 2H₂O → 2NaOH + H₂
NaOH is strong alkaline base.
H₂ is the hydrogen gas
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