Answer: I think it's D
Explanation: None of the other options are true.
Which of the following elements has the ability to undergo sublimation
iodine
oxygen
carbon sodium
Answer:
iodine
Explanation:
What is the pressure of a car tire that had an initial pressure of 33.7 kPa but was
heated from 98.4°C to 110.°C?
Answer:
34752.6 Pa.
Explanation:
Applying,
P/T = P'/T'............... Equation 1
Where P = Initial Pressure, T = Initial Temperature, P' = Final pressure, T' = Final temperature.
make P' the subject of the equation
P' = (PT'/T).............. Equation 2
From the question,
Given: P = 33.7 kPa = 33700 Pa, T = 98.4°C = (273+98.4) = 371.4 K, T' = (110+273) = 383 K
Substitute these values into equation 2
P' = (33700×383)/371.4
P' = 34752.6 Pa.
Ionic compounds are held together with ionic bonds between ions. The ions are formed when valence electrons are
Answer: Electrovalent bonds are produced when electrons are transferred from atoms of one element to atoms of another element, producing positive and negative ions. The bond which is formed by the transfer of electrons between the atoms is called electrovalent bond or ionic bond. Electrovalent bonds are only formed between metals and non-metals. Electrovalent bonds are not formed between two non-metals.
In simple words electrovalent bond involves the transference of a certain number of electrons to another dissimilar atom which has a tendency to gain electrons so that both acquire stable inert gas configurations. The electrostatic attraction always tends to decrease the potential energy. Hence, the potential energy of the system is much less than it was before the formation of an ionic bond.
Explanation: An Ionic bond is the bond formed by the complete transfer of valence electron to attain stability.
This type of bonding leads to the formation of two oppositely charged ions – positive ion known as cations and negative ions are known as anions.
The presence of two oppositely charged ions results in a strong attractive force between them. This force is an ionic or electrovalent bond.
Ionic bonds form between atoms with large differences in electronegativity, whereas covalent bonds formed between atoms with smaller differences in electronegativity.
The compound formed by the electrostatic attraction of positive and negative ions is called an ionic compound.
Students studying solid-state
physics are discussing the
microscopic structure of
materials.
Which student's statement
correctly identifies the nature
of these materials?
Answer:Material X would be classified as a crystalline solid because atoms are in a highly ordered three-dimensional arrangement.
Explanation: it makes sense I'm sorry if its wrong
please help! due soon!
Answer:
I think it's
there are the same number of molecules on each side of the equation, then a change of pressure makes no difference to the position of equilibrium
Neutral atom has 17 electrons. How many neutrons are there in this atom?
Answer:
17
Explanation:
in a neutral atom the number of proton is equal to the number of neutron which is also equal to the number electron in a neutral element so according to the question the mass number is 34 it's proton and atomic number is still 17 and the electron is still 17
how many atoms are in 4.5 moles of Al?
Explanation:
4.5×6.022×10²³
27.099×10²³
According to Avogadro's number, there are 27.10×10²³ atoms in 4.5 moles of Al.
What is Avogadro's number?Avogadro's number is defined as a proportionality factor which relates number of constituent particles with the amount of substance which is present in the sample.
It has a SI unit of reciprocal mole whose numeric value is expressed in reciprocal mole which is a dimensionless number and is called as Avogadro's constant.It relates the volume of a substance with it's average volume occupied by one of it's particles .
According to the definitions, Avogadro's number depend on determined value of mass of one atom of those elements.It bridges the gap between macroscopic and microscopic world by relating amount of substance with number of particles.
Number of atoms can be calculated using Avogadro's number as follows: mass/molar mass×Avogadro's number.As 1 mole =6.023×10²³ atoms , thus,4.5 moles =4.5×6.023×10²³ = 27.10×10²³ atoms.
Thus, there are 27.10×10²³ atoms in 4.5 moles of Al.
Learn more about Avogadro's number,here:
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what does the period number on the periodic table tell us?
Answer:
The period number on the Periodic table tells you the total number of orbits that the atom will have. In other words, the period number indicates the number of energy levels (or energy orbit) of an atom. For example, 1st period indicates that these elements possess 1 energy shell (or energy orbit).
Explanation:
what name is given to group II elements in the periodic table
Answer:
alkaline earth metals
hope this helps
have a good day :)
Explanation:
Answer:
Alkaline earth metals
Explanation:
Which of the following an ionic bond like what holds Na+ and Cl- together in NaCl?
(Hint: Ionic bonds form between metals & non-metals.)
a
The chemical bond that holds H+ and N3- together in NH3
b
The chemical bond that holds Be2+ and Cl- together in BeCl2
c
The chemical bond that holds B3+ and Cl- together in BCl3
d
The chemical bond that holds H+ and Cl- together in HCl
Answer:
Rb
Explanation:
Rb look closely
how many electrons does an element have if its atomic number is 20
Answer:
20 electrons
A neutral atom with atomic number 20 will have 20 electrons.
The atomic number is, by definiton, the number of protons in an atom's nucleus but for a neutral atom it's also equal to the number of electrons. Each element has a different, unique number of protons that determines its identity.
Explanation:
How many grams of hydrogen are in 85.0 g of Ca(OH)2
Answer: 2.30 grams
Explanation: First find how many moles you have:
The molar masses are taken from the periodic table: Ca is 40, O is 16, H is 1. There are two O and 2 H from (OH)2 40+32+2=74 g/mol. Grams (given) x mol/grams (molar mass) = mols, so 85 grams x 1 mol / 74 grams = 1.149 mol. For every mol of Ca(OH)2, there is 2 mol of H so x2 = 2.297 mol H. For every mol of H, there is one gram so 2.297 grams. Rounded to three significant figures you get 2.30 grams.
How do you write balance equations Fe2 S3+O2-Fe2O3+SO2
Answer:
2Fe2 S3+6O2 → 2Fe2O3+3SO2
Explanation:
What is a state function?
A measure of how close a series of measurements are to one another.
Answer: Precision is a measure of how close a series of measurements are to one another. Precise measurements are highly reproducible, even if the measurements are not near the correct value. Darts thrown at a dartboard are helpful in illustrating accuracy and precision
Explanation: a if this wrong u fault u gave no detail
Which statement is correct about the rate of chemical reactions? (5 points) It increases when the temperature decreases. It increases when a catalyst is added. It does not depend on the temperature. It does not depend on the presence of catalysts.
There is an increase in temperature when the rate of chemical reactions increases.
What is a chemical reaction?The chemical reaction is the process in which the two or more substances where the reactions are converted into one or more different substances. These may be either chemical elements or compounds.
The chemical reaction rearranges the atoms of the reactants to create the different substances of the product. The speed of the reaction depends on the rate of temperature and as well reactant itself.
Find out more information about the chemical reactions.
brainly.com/question/16416932
Answer:
It increases when a catalyst is added.
Explanation:
"A catalyst is a substance that can be added to a reaction to increase the reaction rate without getting consumed in the process. Catalysts typically speed up a reaction by reducing the activation energy or changing the reaction mechanism." (Khan Academy)
Which of the following statements about alkynes is incorrect?
Alkynes are unsaturated hydrocarbons.
Alkynes have triple bonds.
Alkynes are saturated hydrocarbons.
Alkynes have carbon atoms.
Answer:
Alkynes are saturated hydrocarbons
Explanation:
Alkynes are groups of hydrocarbons that have the general formula of {Cn H2n - 2}. They have a triple carbon to carbon bond (C≡C) in their structure. Ethyne (HC≡CH) is the first member of the alkyne series.
Alkynes like alkenes are unsaturated hydrocarbons because of their triple and double carbon bonds respectively. Unsaturated hydrocarbons do not have a complete hydrogen atom in their structural composition. Hence, the statement that "Alkynes are saturated hydrocarbons" is FALSE.
Here anwser questions 2 ,4,6 those charts okay I also put how the formula on top solve these problems ! Please help me I geniunuly don’t understand this concept if you do I will mark you brainliest I don’t understand :( ! please don’t scam me I’m helpless
Answer:
39.5L
Explanation:
2. What states of matter exist within the human body? What state of matter do you think your body is mostly made up of? Why? (4 points) Think about whether the body contains solids, liquids, or gases. Which of the three would you be most likely to find?
Answer:
Solids, liquids, and gases, exist in the human body. The body is mostly made up of liquid because the human body is 60% water. You would most likely be able to find solids (bones), liquids (blood, stomach acid) and gases (oxygen in your lungs or air in your digestive tract).
Explanation:
A gas has a volume of 45.0 mL and a pressure of .98 atm. If the pressure increased to 2.1 atm and the temperature remained the same, what would be the new volume?
Answer: The new volume is 95.45 mL.
Explanation:
Given: [tex]V_{1}[/tex] = 45.0 mL, [tex]P_{1}[/tex] = 0.98 atm
[tex]P_{2}[/tex] = 2.1 atm, [tex]V_{2}[/tex] = ?
According to Boyle's law, at constant temperature the pressure of a gas is inversely proportional to its volume.
Therefore, formula used to calculate the new volume is as follows.
[tex]\frac{P_{1}}{V_{1}} = \frac{P_{2}}{V_{2}}[/tex]
Substitute the values into above formula as follows.
[tex]\frac{P_{1}}{V_{1}} = \frac{P_{2}}{V_{2}}\\\frac{0.98 atm}{45.0 mL} = \frac{2.1 atm}{V_{2}}\\V_{2} = 95.45 mL[/tex]
Thus, we can conclude that the new volume is 95.45 mL.
Low-beam headlights must show objects _______ feet ahead.
Answer:
150 feet
Explanation:
5. What is the difference between a reflected and a diffracted sound wave?
A. A reflected sound wave is absorbed by the medium. A diffracted sound wave changes
direction as it passes through an opening.
B. A diffracted sound wave bounces back to the place of origin. A reflected sound wave is
absorbed as it passes through an opening.
C. A reflected sound wave bounces back to the place of origin. A diffracted sound wave
changes direction as it passes through an opening.
D. A diffracted sound wave bounces back to the place of origin. A reflected sound wave
changes direction as it passes through an opening.
Answer:
Reflection involves a change in direction of waves when they bounce off a barrier; refraction of waves involves a change in the direction of waves as they pass from one medium to another; and diffraction involves a change in direction of waves as they pass through an opening or around a barrier in their path.
Explanation:
https://www.physicsclassroom.com/class/waves/Lesson-3/Reflection,-Refraction,-and-Diffraction#:~:text=Diffraction%20of%20Waves-,Reflection%20involves%20a%20change%20in%20direction%20of%20waves%20when%20they,a%20barrier%20in%20their%20path.
Reflection of sound wave differs from diffraction of sound wave in that a reflected sound wave bounces back to the place of origin while a diffracted sound wave changes direction as it passes through an opening.
What is reflection?Reflection is the bouncing back of a wave when it hits an obstacle along its path.
What is diffraction?Diffraction is the spreading out of a wave in a circular path as it passes through a tiny opening.
Therefore, the difference between reflection and diffraction is that a reflected sound wave bounces back to the place of origin while a diffracted sound wave changes direction as it passes through an opening.
Learn more about reflection and diffraction at: https://brainly.com/question/11176463
1 Clouds are formed when millions of drops of water become suspended in the air. Which
of the following is a step in the process of cloud formation?
A Expansion of cold air
B Formation of carbon dioxide
C Condensation of water vapor
D Breakdown of atmospheric ozone
Answer:
C Condensation of water vapor
Explanation:
One of the components of the atmosphere is water vapour. Water vapour is always present in air.
This water vapour may combine with particles of dust and smoke and condense around them to form clouds.
As more water vapour condenses and coalesces, the clouds become thicker and precipitation eventually follows.
ILL MARK AS BRAINLESS PLS HELP
Using the example of an ambulance, explain the Doppler Effect. Infer why the doppler effect can or cannot occur in all waves. PLEASE ANSWER ILL PICK BRAINLEIST TO THE FIRST ACTUAL ANSWER
Answer:
When the ambulance is coming towardss you the waves are smushed together and sound higher pitched but then it passes you and when tracveling away the waves are scretched out so the whee whoo sounds lower and that is because of the doppler effect
What is a neutralization reaction?
The reaction between strong acid and base which results in the formation of salt and water. This reaction is called Neutralization reaction.
Ex:- HCl + NaOH → NaCl + H2O.
5). At what temperature (K) will 0.854 moles of neon gas occupy 12.3 L at 1.95
atmospheres?
Answer:
338.38 K
Explanation:
Applying,
PV = nRT............... Equation 1
Where P = pressure, V = Volume, R = Temperature, n = number of moles, T = temperature.
Make T the subject of the equation,
T = PV/nR............. Equation 2
From the question,
Given: P = 1.95 atm, V = 12.3 L, n = 0.854 moles
Constant: R = 0.083 L.atm/K.mol
Substitute these values into equation 2
T = (1.95×12.3)/(0.854×0.083)
T = 338.38 K
what is:
Na2O+SO2 =
for chemistry
Na2SO3 – Sodium sulfite
What gets released back into the air when humans and animals breathe ? What is this process called?
Answer:
Respiration is the process humans and animals breathe c02 out
Answer:
CO2 is released into the air when we breathe
The process is called respiration
Balance the equation ___C+___Fe203—-____CO2+___Fe
Answer:
3,2,3,4
Explanation:
try this answer, it's syits best to the question