Answer:
It's D. Francium
Explanation:
Atomic radii vary in a predictable way across the periodic table. The atomic radius increases from top to bottom in a group and decreases from left to right across a period. Thus, Helium is the smallest element, and Francium is the largest.
Why do thunderclouds grow very tall?
Answer:
This lift usually comes from differences in air density. Warmer, less dense air rises upward, creating lift. As the air lifts higher and higher, it causes a storm cloud to grow taller and taller. Thunderstorm clouds can rise up to 10 miles into the air!
Q.) Oxidation number of P in PO4³, of S in SO4² and that of Cr in Cr₂O7² are respectively:
(a) +3, +6 and +5
(b) +5, +3 and +6
(c) +3, +6 and +6
(d) +5, +6 and +6
.The equation shows the complete combustion of propane.
C3H8(g) + 502(g) → 3CO2(g) + 4H₂O(l)
Which statement is correct?
A 10 cm³ of propane cannot burn if less than 50 cm³ of oxygen is present.
B 10 cm³ of propane would produce 40 cm³ of liquid water.
C 100 cm³ of oxygen would be sufficient to react completely with 20 cm³ of propane.
D This reaction would result in an increase in the volume of gas.
Answer:
A.
Explanation:
Ten cc propane would require 50 cc oxygen TO BURN ALL OF THE PROPANE; HOWEVER, some propane will burn if some oxygen is present. If less than 50 cc not all of the propane will burn.
what mass of hi should be present in 0.300 l of solution to obtain a solution with each ph value?
0.054 gm of of HI should be present in 0.300 l of solution to obtain a solution with each pH value.
A solution's pH is a measure of its hydrogen ion concentration, which is a measure of its acidity. Pure water dissociates slightly into hydrogen and hydroxyl (OH) ions in equal proportions.
In chemistry, pH is a scale used to quantify the acidity or basicity of an aqueous solution. It was traditionally denoted as "potential of hydrogen". The pH of acidic solutions is lower than that of basic or alkaline solutions.
Indicators may be used to monitor pH since their colour varies as the pH changes. A visual comparison of the colour of a test solution with a standard colour chart allows for precise pH measurement to the closest whole integer. Color may be quantified more precisely if it is measured spectrophotometrically with a colorimeter or spectrophotometer.
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What happens to the molar volume when the pressure decreases?
-Molar volume increases
-Molar volume decreases
-Molar volume stays the same
Ideal gas law is valid only for ideal gas not for vanderwaal gas. Therefore, when the pressure decreases, molar volume increases. Ideal gas is a hypothetical gas.
What is ideal gas equation?Ideal gas equation is the mathematical expression that relates pressure volume and temperature. There is no force of attraction between the particles.
Mathematically the relation between Pressure, volume and temperature can be given as
PV=nRT
where,
P = pressure of gas
V= volume of gas
n =number of moles of gas
T =temperature of gas
R = Gas constant = 0.0821 Latm/Kmol
According to above equation we can see that pressure is inversely proportional to volume. On decreasing the pressure, volume will increase.
Therefore, when the pressure decreases, molar volume increases.
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Answer:
A. molar volume increases
Explanation:
Checked on edge.
Given the volumes of a solvent and solute and their density, what temperature do they freeze at? It would really help if someone helped explain how to do this, I’m kind of stuck thanks
Yes, it will freeze at 0 degree Celsius. The correct option is A.
What is freezing point?The temperature at which a liquid solidifies is known as the freezing point. Similar to the melting point, the freezing point typically rises with increasing pressure.
The freezing point depression equation must be used to calculate the freezing temperature of a solvent and solute mixture. You can use this equation to determine how adding a solute alters a solvent's freezing point.
ΔTf = Kf x molality
Here,
Mass of the solvent = 100 mL x 1 g/mL = 100 g
Molality of the solute = 10 g / 58.44 g/mol = 0.171 mol
Molality of the solvent = 0.171 mol / 100 g = 0.00171 mol/g
So,
ΔTf = 1.86 °C/m x 0.00171 m = 0.00316 °C
Thus, the correct option is A.
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To tet the quality of water ource in her area, Shameka collect five ample from each water ource and tet the quality of each ample. Which important tep of cientific deign i Shameka conducting?
repetition
replication
verification of reult
uing controlled variable
Option (d) is correct. To test the quality of water source in the area, the important technique that Shameka used s verification of results.
To test the quality of water, the qualitative and quantitative measurements are needed from time to time to constantly monitor the quality of water from the various sources of supply. there have to initiate remedial measures with the suppliers when water supply from outside is polluted. Testing procedures and parameters may be grouped into physical, chemical, bacteriological and microscopic categories.
· The physical tests indicate properties detectable by the senses.
· The chemical tests determine the amounts of mineral and organic substances that affect water quality.
· Bacteriological tests show the presence of bacteria, characteristic of pollution.
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Which phrase describes the movement of air in general?
A. from high pressure to low pressure
B. from north to south
C. from south to north
D. from low pressure to high pressure
The statement above which identifies the best phrase which describes the movement of air in general is: from high pressure to low pressure.
The correct answer choice is option a.
What is meant by air?Air is regarded as a mixture due to the fact that it contains different substances such as carbon dioxide, oxygen, rare gases, dust, water , moisture and so on and so forth. However, air usually moves from high pressure to low pressure simply because as air particles warm, it usually ascends, leading to low pressure at the surface.
In conclusion, we can now confirm and deduce from the explanation given above that air too moves from one point to another.
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The equation shows reactants to a neutralization reaction.
ca2 + oh– arrow h+ no-
which describes what will happen to the h when these reactants form products?
a. h binds with no to make a salt.
b. h binds with ca2 to make an acid.
c. h binds with oh– to make water.
d. h binds with ca2 to make a base.
The equation shows reactants to a neutralization reaction.
Ca²⁺ + OH⁻ → H⁺ + NO⁻. Here H binds with OH⁻ to make water. So the option c is correct.
As the answer to the question is cleared from these reactions. Firstly calcium hydroxide combines with nitric acid to form the products as follows;
Ca(OH)₂ + 2HNO₃ → Ca(NO₃)₂ + 2H₂O
Now the reaction between ionic species will be as follows
Ca²⁺ + 2OH⁻ + 2H⁺ + 2NO₃⁻ → Ca²⁺ + 2NO₃⁻ + 2H₂O
Hence OH⁻ combines with H⁺ to make H₂O(water)
OH⁻ + H⁺ → H₂O
H⁺ binds with OH⁻ to make water
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A student makes the following statement:
“Ozone depletion is causing global warming. When the ozone layer is destroyed, more UV light reaches Earth’s surface. An increase in UV light causes Earth to be warmer.”
Evaluate the student’s statement to decide whether you agree/disagree and support your answer
I agree with the student's statement that states that ozone depletion is causing global warming.
What is ozone layer depletion?Ozone layer depletion is the gradual thinning of the earth’s ozone layer in the upper atmosphere caused due to the release of chemical compounds containing gaseous bromine or chlorine from industries or other human activities.
The ozone layer is a region in the earth’s stratosphere that contains high concentrations of ozone and protects the earth from the harmful ultraviolet radiations of the sun.
Global warming is a sustained increase in the average temperature of the Earth, sufficient to cause climate change.
Greenhouse gases emitted into the atmosphere are the causes depletion of ozone layer, which in turn leads to global warming.
Chlorofluorocarbons or CFCs are the main cause of ozone layer depletion. These are released by solvents, spray aerosols, refrigerators, air-conditioners, etc.
Therefore, the statement made by the student is correct and I agree with it.
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What is 1 moles in grams?
Carbon-12 has a theoretical atomic mass of 12 grams (6 protons and 6 neutrons). This means that the atomic mass or atomic weight of carbon (12 grams) equals exactly 1 mole of carbon.
In the International System of Units, the mole (symbol mol) is the unit of substance amount (SI). The amount of substance is a measurement of how many elementary entities of a given substance are present in an object or sample.
An elementary entity can be an atom, a molecule, an ion, an ion pair, or a subatomic particle such as an electron, depending on the substance. For example, despite having different volumes and masses, 10 moles of water (a chemical compound) and 10 moles of mercury (a chemical element) contain equal amounts of substance, and the mercury contains exactly one atom for each molecule of water.
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Can energy be destroyed?
Answer: No
Explanation:
Give the Lewis dot structure for CH3O
CH3O Lewis dot structure has two lone pairs, one single electron, and a negative charge. The central atom, carbon does not hold any lone pars as after binding the compounds get filled valence shells with the help of electrons shared by Hydrogen and Oxygen atoms.
In his idea of cubic atoms, Lewis developed the "octet rule." The preference of atoms to have eight electrons in the valence shell is referred to as the "octet rule." Atoms with fewer than eight electrons have a propensity to interact, resulting in the formation of more stable compounds. The most stable state that atoms can achieve through their reactions. Two dots or a line (Kekulé structures lines) between the connected atoms serve as representations of bonds, which are made up of two shared electrons. Using two and three lines/(pairs of electrons), respectively, double bonds and triple bonds are shown. A Lewis dot structure is based on the octet rule, which states that atoms share electrons so that each has eight electrons in its outer shell
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i’m marking brainiest
Atoms will combine with each in order to become more chemically stable. Compounds are formed between two atoms that have incomplete outer energy levels. The two types of compounds that can be formed between atoms are ionic and covalent. Ionic compounds are formed between two oppositely charged atoms. ionic compounds contain a metal ion and a non - metal ion:
Metals will lose electrons to form positive ions and nonmetals will gain elections to form negative ions. These oppositely charge ions are very attracted to each other and forms very strong bonds as a result.
Ionic compounds are characterized by crystalline structure.
High melting and boiling points, and are solids at room temperature.
Two non-metals will combine to form covalent compounds. Covalent compounds are formed when two atoms share one or more pairs of electrons The force of attraction between the main relatively weak. Covalent compounds are characterized by low melting and boiling points, and can be gases, liquids and soft solids at room temperature.
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I got stuck on this question
Answer:
The best conductor is Copper
Explanation:
because it's able to generate more heat than the other 2
question another sample of eggshell reacts completely with 4.0ml of an hcl(aq) solution of unknown concentration. if the reaction produced 0.095atm of gas, the concentration of the hcl(aq) solution was at least
The concentration of the HCl (aq) solution was at least 1.0 M.
What is concentration?
The abundance of a constituent divided by the sum of the mixture's volumes is the definition of concentration in chemistry. There are several different categories of mathematical description: mass concentration, molar concentration, number concentration, and volume concentration
P = 0.095atm(corresponds to 0.20g of CaCO3
so,moles of CaCO3 =0.20g/100gmol⁻¹=0.002moles
moles of HCl =(molesₓCaCO3ₓ2)=0.002ₓ2
M=0.004/4ₓ100
Concentration of HCl=1M
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Which is NOT a typical cation of chromium?
a. 2+
b. 3+
c. 5+
d. 6+
The one which is not a typical cation of chromium is the option c) +5. chromium found in the form of Cr⁺², Cr⁺³ and Cr⁺⁶.
The transition metals will readily form the cation +2 and +3. the atomic number of the chromium is 24. the chromium belongs to d block transition elements. the electronic configuration is given as :
Cr = 1s² 2s² 2p⁶ 3s² 3p⁶ 4s¹ 3d⁵
the chromium loose one s electron and then a d electron and form Cr⁺², the chromium will loose more two electrons from the d and form Cr⁺³, which stable state, chromium will loose more electrons and form Cr⁺⁶.
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How many bonds can chlorine make?
Answer:
7 covalent bonds
Explanation:
Answer:
In these compounds carbon, nitrogen, oxygen, and chlorine atoms have four, three, two, and one bonds, respectively.
Explanation:
What would happen if you were missing NADH from glycolysis?
If NADH from glycolysis is missing then, glycolysis will not be able to continue.
As they return to glycolysis or the citric acid cycle, these low-energy molecules pick up more high-energy electrons that allow the process to proceed. If NAD+ is not present to pick up electrons as the reactions progress, neither glycolysis nor the citric acid cycle can occur.
The method by which glucose is metabolized to produce energy is known as glycolysis. It generates water, ATP, NADH, and two pyruvate molecules. There is no need for oxygen for the process, which occurs in a cell's cytoplasm.
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A gas mixture containing oxygen, nitrogen, and carbon dioxide has a total pressure of 42.9 kpa. what is the partial pressure of carbon dioxide if the partial pressure of oxygen is 6.6 kpa and the partial pressure of nitrogen is 23.0 kpa?
a. 29.6 kpa
b. 19.9 kpa
c. 13.3 kpa
d. 36.3 kpa
e. 14.3 kpa
Answer:
c
Explanation:
Whatever is left :
42.9 - 6.6 - 23 = 13.3 kpa
Answer:
13.3 kpa
Explanation:
Anything that takes up space is called _____
Matter is everything that occupies physical space. Everything on earth, including the atmosphere, that occupies space and has a certain mass is considered matter.
Anything that occupies space and has mass is considered to be matter. The world around you is composed of matter. A general phrase for the "stuff" all around you is matter. An item has a quantifiable size or volume when it occupies space. A measurement of matter's resistance to acceleration is its mass. Everything around us takes up space. Now, we are aware that matter refers to everything that takes up space. Atoms are the minuscule constituents of matter. Typically, we focus our studies solely on the three states of matter: solid, liquid, and gas.
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How do water and land surfaces differ in their abilities to absorb and radiate heat energy?
Land absorb more radiation from the solar energy than water and retains the absorbed heat.
As the earth surface is darker compared to the water surface, more radiations gets absorbed, so it heats up quickly. Water surface reflects most of the incoming radiations, so it takes longer for water to get heated. Also, it takes less energy to rise the temperature on land than water, because water has higher specific heat capacity. Also water cools downs slowly because of this.
Due to this difference in heating and cooling properties of land and water, the differences in temperature and air mass movement occurs across land and water. During day time, as it absorbs more radiations, the land gets heated up quickly and temperature of water changes only slightly. During night, the temperature of lands drops quickly, but water will retain the temperature for long period.
Thus land gains and lose heat quickly compared to water and this result in climatic changes across different areas.
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How many bonds does chlorine like to form?
Answer: In these compounds carbon, nitrogen, oxygen, and chlorine atoms have four, three, two, and one bonds, respectively. The hydrogen atom and the halogen atoms form only one covalent bond to other atoms in most stable neutral compounds.
Explanation:
Consider the reaction of a generic metal ion (Mn+) with a generic porphine molecule (por): M(H2O)mn+(aq)+por(aq)⇌M(por)n+(aq)+mH2O(l) Based on the values of standard enthalpy, ΔH∘, and entropy, ΔS∘, shown here, ΔH∘ ΔS∘ -21.5 kJ 7.82 J/KJ/K what is the value of the formation constant, Kf , for the reaction at 25 ∘C?
Kf, at 25 °C, is 713 for the reaction M(H2O)mn+(aq)+por(aq)⇌M(por)n+(aq)+mH2O(l)
The chemical compound porphine, sometimes known as porphin, has the formula C20H14N4. It is the simplest of the tetrapyrroles since it is composed of four pyrrole-like rings connected by four methine (= C H ) groups to form a bigger macrocycle ring. The molecule is flat. It is categorized as a heterocyclic and aromatic chemical. The measure of a system's chaos is called entropy. It is an extensive characteristic of a thermodynamic system, which indicates that the amount of matter in the system affects how much it is worth. Entropy is frequently represented in equations by the symbol S and is measured in joules per kelvin (JK1) or kg/m2/s2K1. The entropy of a well organized system is low.
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. Activity effects may be expected to be most important in a. extremely dilute solutions. b. solutions of low pH. c. very concentrated solutions.
The correct Answer is C. concentrated solutions.
The activities of all species tend to be smaller than the formal concentration solutions become more concentrated. The decrease in activity with increasing concentration is much more pronounced for ions than for neutral solutes. Chemists can use activities to explain various differences between ideal and real solutions. To describe a real solution, the mathematical description of an ideal solution must be modified, just as the law for ideal gases (PV = nRT) must be modified to describe real gases.
Activity measures how many particles "appear" to be present in the solution, as opposed to how many are actually present. As a result, activity acts as a "fudge factor" in ideal solutions, correcting the true concentration. agas is a unitless ratio. The ratio asolute has no units.
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Classify the following solvents as either protic or aprotic solvents. Note: if one or more solvents are incorrectly placed, a single red x will appear on the top left. Protic aprotic CH3OH CH3CH2OH acetic acid DMF DMSO acetonitrile acetone H2O
Among the given solvents, the protic solvents are CH₃OH, H₂O, CH₃CH₂OH, and aprotic solvents are DMF, DMSO and acetonitrile.
What are protic solvents?Protic solvents are those having free hydrogen atoms which are capable of forming hydrogen bonds through intermolecular mode. Whereas aprotic solvents are those having no free hydrogen atoms and are not capable of forming hydrogen bonds.
Water, alcohols, acids etc are protic solvents. These solvents furnish protons when ionized or dissolved in water. Aprotic solvents does not have free hydrogen to furnish.
Among the given solvents the protic solvents are CH₃OH, H₂O, CH₃CH₂OH and the aprotic solvents are DMF, DMSO and acetonitrile.
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Why does C have 4 valence electrons?
Carbon has four valence electrons, so it can achieve a full outer energy level by forming four covalent bonds.
What type of bond form by carbon ?Because of its small size and ability to tightly hang on to the shared pairs of electrons, carbon forms strong bonds with the majority of other elements.
Carbon is 2,4 in its electrical form. As a result, it typically creates covalent compounds because it is unable to add or subtract four electrons to complete an octet. Methane is a prime example of such a substance (CH4).
The electrons closest to the nucleus experience the least attraction from it, making them the most reactive. Valence electrons are these electrons. The most significant part of chemical bonding is played by them.
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Identify the reagents needed to carry out each reaction. H20 Br NaH OH TsCI pyridine OTs TsOH Br HBr NBS KOC(CH3)3 CI H.O 2 Br 011 Cl
To solve this, we need to have a clear concept behind reactions of chemical reagent. Therefore, the reagents can be filled in below given ways.
What is chemical reagent?The word "reagent" refers to a chemical component (a compound or combination, often of inorganic or tiny organic molecules) injected into organic chemistry to produce the desired conversion of an organic material. Collins, Fenton, and Grignard reagents are among examples.
The reagent needed to carry out each reaction are:
For first reaction, reagent needed are HBr and KOC(CH[tex]_3[/tex])[tex]_3[/tex].
For second reaction, reagent needed are TsCl, pyridine and KOC(CH[tex]_3[/tex])[tex]_3[/tex].
For third reaction, reagent needed are TsOH, NBS and KOC(CH[tex]_3[/tex])[tex]_3[/tex].
For first reaction, reagent needed are Cl[tex]_2[/tex],H[tex]_2[/tex]O, NaH and HBr.
Therefore, the reagents can be filled in above given ways.
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Use formal charge to choose the best Lewis structure for CH3SO2CH3. H :0: H A) H-C-$-C-H H:0: H : B) H-Ç=ş-C-H H:0: H 11 H: H C) H-C-S-C-H H:0 H H 6: H D) H-C=$=C-H H:0: H III
The lewis structure of the given compound methyl thiosulphonate represents the bonded pairs and the lone pair of electron in the oxygen atom as well in the image.
What is methyl thiosulphonate?Methyl thiosulphonate is a common solvent used in synthetic reactions. It is an aprotic solvent and is polar in nature. The compound contains an SO₂ group where the formal charge of both oxygen and sulphur is zero.
The Lewis dot structure helps to identify the bonded pair of electrons, lone pairs and non-bonded pairs of electrons on each bonded atoms in a compound.
Each oxygen atoms in the given compound is double bonded to the sulphur through covalent bonding and which have two pairs of non-bonded electrons. Both oxygen and sulphur contains 6 valence electrons and the hydrogens are sigma bonded to carbon atoms.
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order the following ion pairs by decreasing bond strength. (strongest to weakest: left to right.)
From strongest to weakest bond strength: left to right:- Mg^2+ O^2 > Ca^2+ O^2- > Ca^2+ Se^2- >Li F^- > Na^+ F^- > Na^+ Br^- due to short Ionic Bond strength.
Bond energy, also known as mean bond enthalpy as well as average bond enthalpy, is a measure of the strength of a chemical bond. In chemistry, bond strength has been defined as the strength that a chemical bond contains two atoms together. This one is usually expressed in kilocalories per mole as the amount of energy needed to break the bond.
Due to the electrostatic attraction among its negative and positive ions, an ionic compound is stable. The lattice energy of an ionic bond is the amount of energy required to separate one mole of the a compound into its gas phase ions. Ions to higher charges as well as shorter distances between them have higher lattice energy.
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