Answer:
Gas pressure is caused when gas particles hit the walls of their container. The more often the particles hit the walls, and the faster they are moving when they do this, the higher the pressure. This is why the pressure in a tyre or balloon goes up when more air is pumped in.
Which one of the following is NOT the unit of wave number:
m-1
cm-1
mm-1
cm
Answer:
e
Explanation:
cm is not the unit of wave number out of the following.
What is a wave number?Definition: Total number of wave cycles present in a unit distance is termed a wave number.
Wave number is always a reciprocal of the unit of distance.Wave number is denoted by the letter 'k'.The formula for wave number is 2π/λ where λ is the wavelength. Since wave number is always reciprocal, cm is not the unit for a wave number. The higher the wave number, the higher the frequency and energy.To learn more about wave number, refer to:
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What's the major difference between carbon and other group IV elements, excluding allotropy
Answer:
Carbon has an ability of catenation which other group IV elements lack.
Explanation:
Catenation is the ability for an element to form multiple bonds with other elements leading rise to long chains of compounds.
An example is organic compounds.
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2. State a common metric unit and symbol obtained from each of the following instruments.
(a) metric ruler
(b) balance
(c) graduated cylinder
(d) thermometer
Answer:
cm
Explanation:
for short measurements
Why are intensive properties useful for identifying a substance?
A.They do not depend on the amount of substance you have.
B.They are chemical properties.
C.They are physical properties.
D.They describe the amount of substance you have.
The intensive properties are useful for identifying a substance because it does not depend upon the amount of substance present in the sample.
The points regarding properties are the following:
The intensive properties are defined as the properties which do not depend on the amount of the substance present in the matter but depend only on the type of the matter.The colour, solubility, texture, etc. are the intensive properties. •The properties which depend upon the amount of the substance present in the sample is called the extensive properties.The mass, density etc. are the extensive properties.Therefore, the correct answer is the A. They do not depend on the amount of substance you have.
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Chloric acid (HCIO3 is a neutral compound. The chlorine atom has what oxidation number?
Answer: 1
Explanation: one
Chloric acid is a neutral compound and an oxoacid with strong oxidizing power. In the compound (chloric acid), chlorine has an oxidation number of +5. Thus, option c is correct.
What is the oxidation number?The oxidation number is defined as electrons that are transferred by accepting and donating in a chemical bond formation. They denote the atoms that have gained and donated electrons by the positive and negative states.
As chloric acid is a neutral compound, the equivalent will be zero. The oxidation state of the hydrogen atom is generally taken as 1 and that of oxygen as -2 as it requires two more electrons in its valence shell.
The oxidation number will be estimated as,
HCIO₃ = 0
+1 + x + 3(-2) = 0
+1 + x - 6 = 0
x = + 6 - 1
x = + 5
Therefore, option c. chlorine has a +5 oxidation number in chloric acid.
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Please help me please
Answer:
Hope this helps.
Explanation:
See the picture. Hope it helps. Sorry if i was incorrect.
what is Planck's constant ??
Planck's constant =
6.62607004 × 10-34 m2 kg / s
Explanation:
Step by Step explanation
The Planck constant, or Planck's constant, is a fundamental physical constant denoted h, and is of fundamental importance in quantum mechanics. A photon's energy is equal to its frequency multiplied by the Planck constant. Due to mass–energy equivalence, the Planck constant also relates mass to frequency. Wikipedia
Answer:
The Planck constant, or Planck's constant, is a fundamental physical constant denoted h, and is of fundamental importance in quantum mechanics. A photon's energy is equal to its frequency multiplied by the Planck constant. Due to mass–energy equivalence, the Planck constant also relates mass to frequency.
Plancks constant =
6.62607004 × 10-34 m2 kg / s
pls mark me as brainliestMrs. Marlow's class is conducting an investigation of a mixture of sand, iron filings, and salt. They were told that they must separate the mixture into pure sand, pure iron filings, and pure salt using only the physical properties of each component using the following supplies:
bar magnet
filter paper
plastic funnel
water
What is the BEST procedure for the students to follow in order to separate the mixture?
A mixture can be separated by looking at the physical properties of the components of the mixture.
Since salt is soluble in water, water can be added to the mixture to dissolve the salt.
The bar magnet is now introduced in order to remove the iron filings since they are attracted by a magnet.
The solution is filtered to separate the sand from the salt solution.
Lastly, the salt solution is heated to dryness to drive away the water and obtain the solid salt.
Hence the mixture has been separated into its components using their individual physical properties. Option A is the correct answer.
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Answer:
is it a b c or d
Explanation:
write the symptoms of Tuberculosis
Answer:
Hi, There! Your Answer is Below!
Coughing for three or more weeks.
Coughing up blood or mucus.
Chest pain, or pain with breathing or coughing.
Explanation:
Tuberculosis (TB) is a disease caused by germs that are spread from person to person through the air. TB usually affects the lungs, but it can also affect other parts of the body, such as the brain, the kidneys, or the spine. A person with TB can die if they do not get treatment.
A galvanic cell is constructed of one half cell in which a silver wire is placed into a 1.00 Maqueous solution of silver nitrate and the other half cell is made of a zinc wire in a 1.00 M aqueous solution of zinc nitrate. calculate gibbs free energy
Answer:
https://www.plps-k12.org/site/handlers/filedownload.ashx?moduleinstanceid=2482&dataid=3257&FileName=Ch%2017%20Electrochemistry%20Practice%20Problems%20I%20-%20key.pdf
Explanation: This is all the answers just go to this link to help is a bunch of pages to help and with answers on them too! Can I get brianliest plz
? Is a scientist who is studying cancer with the
goal of finding an effective treatment doing
pure research or applied research?
A scientist who is studying cancer with the goal of finding an effective treatment is doing applied research.
Applied research refers to scientific investigations that are conducted with the specific purpose of solving practical problems or improving existing technologies. In the case of cancer research, the scientist is aiming to find a treatment that can be directly applied to patients in order to combat the disease.
In contrast, pure research, also known as basic or fundamental research, is conducted to gain a deeper understanding of a particular phenomenon without any immediate practical application in mind. Pure research aims to expand scientific knowledge and explore new theories or concepts. While pure research may indirectly contribute to the development of applied research, its primary goal is to advance our understanding of the natural world.
In summary, a scientist studying cancer with the goal of finding an effective treatment is engaged in applied research, as they are conducting research with the intention of solving a specific problem and developing practical solutions for the benefit of cancer patients.
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topic: Nomenclature and Formula Writing.
reward: up to 200 POINTS!
how?
...
Answer: Writing Formulas for Ionic Compounds Using Nomenclature Another important concept to master is the ability to write a chemical formula using the compound's systematic name.
Explanation:
and compound is a substance made of two or more chemicals that are chemically joined in a specific combination most matter is formed of ____
Answer:
elements
Explanation:
possibly elements
In the laboratory, open-toed shoes and shorts:
a. Are potentially dangerous and should not be worn.
b. Are OK if the weather is hot.
c. Are all right if you are wearing a lab coat
d. Are OK if they are in style.
Answer:
a. Are potentially dangerous and should not be worn.
13. Find the total number of atoms present in the following molecules. a. 5 H₂O b. Zn Cl₂
Please
Answer:
5H²O= 23
ZnCl²=135
have a great day
why is mitochondria called the power house of a cell ?
Answer:
Hey mate....
Explanation:
This is ur answer....
Mitochondria are tiny organelles inside cells that are involved in releasing energy from food. This process is known as cellular respiration. It is for this reason that mitochondria are often referred to as the powerhouses of the cell.
Hope it helps!
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Classify these compounds as acid, base, salt, or other. Drag the appropriate items to their respective bins.
HCOOH, CH3OH, NaOH, HNO3, NaBr, NH3, CO2, KCl
HCOOH is an acid, KCL is a Salt, NaOH is a base.
Acids Bases and SaltsAn acid is defined as a substance which when dissolved in water produces hydronium ion (H3O+), neutralizes bases, tastes sour and turns blue litmus red.
Acids incldes:
HCOOH-weak acidHNO3-Strong acidA Base is a substance which in its aqueous solution produces hydroxyl ions (OH–), neutralizes acids , tastes bitter and turns red litmus blue
Bases incldes:
NaOHNH3A Salt is an ionic compound produced from the neutralization reaction of acids and bases. it is neutral substance and has no effect on litmus.
NaBrKCLThe folloing can be classifed as other or in aqueous solution as :
CO2-acidic oxide, Bronsted lewis acid CH3OH -Bronsted-Lowry acidLearn more on acids base and salts here:https://brainly.com/question/2927542
What is true of an element that is oxidized?
It increased in electronegativity.
It decreased in electronegativity.
It gained electrons.
It lost electrons.
Answer:
When an element is oxidized, it loses electrons
Answer:
The last option is the correct answer.
Explanation:
When an element is oxidized, it loses electrons. But when an element is reduced, it gains electrons. This is the basis of redox reactions.
However, an oxidizing agent oxidizes something else, and gets reduced, therefore gaining electrons. Meanwhile, a reducing agent reduces something else, and gets oxidized in the process, losing its own electrons.
Select the arrangement that orders the compounds by increasing boiling point based on predominant intermolecular force. Please choose the correct answer from the following choices, and then select the submit answer button. Answer choices N2 < CO2 < NH3 < HF
The arrangement that orders the compounds by increasing boiling point based on predominant intermolecular force is; N2 < CO2 < NH3 < HF
The molecules that compose a substance are held together by intermolecular forces. The physical properties of a substance such as boiling points depends on the nature of intermolecular forces between substances. The greater the magnitude of intermolecular interaction between bonding atoms the higher the boiling point.
Nitrogen and CO2 molecules are only held together by weak dispersion forces. However, CO2 has a higher boiling point than N2 because CO2 has a higher molecular mass than N2.
Nitrogen is less electronegative than fluorine hence the magnitude intermolecular interaction via hydrogen bonding in HF is greater than that in NH3 consequently, the boiling point of HF is higher than that of NH3.
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Difference between heavy chemicals and fine chemicals
Answer:
Fine chemicals are used as starting materials for specialty chemicals, particularly pharmaceuticals, biopharmaceuticals and agrochemicals. ... The term "fine chemicals" is used in distinction to "heavy chemicals", which are produced and handled in large lots and are often in a crude state.
Explanation:
Which of the following best describes an electron orbital? (electron orbital)
a) A circular path in which an electron "orbits” around a nucleus.
b) A location around the nucleus in a sphere where the electron is likely to be located.
c) An elliptical path around the nucleus.
d) The nucleus
Answer:
D
Explanation:
If the sum of the last
number and the middle
number of three consecutive
integersis is 71, then the
Least (smallest) number
mumber must be
Answer:
number must be 0000.999
which picture shows the particles in a compound?
picture I and II
picture I
picture III and IV
picture II
hi <3
compound are 2(or more) elements combined together
thus your answer will be picture I
hope this helps <3
We are driving to Orlando. The sign says
that it is 145 kilometers to Orlando.
How many meters is it to Orlando?
A: 0.145
B: 145,000
C: 14.5
D: 14,500
Answer:
b
Explanation:
there is 1000m in 1 km so the ans is literally just 145x1000 m which is 145000m
Answer:
B! 145,000
Explanation:
your welcome love!
An atom has 15 protons and 14 Neutrons. What is the atomic number of this atom?
Answer:
Silicon
Explanation:
Therefore the isotope with 14 protons and 15 neutrons is Silicon-29.
An atom has 15 protons and 14 Neutrons. The atomic number of this atom is 14 and the element is silicon.
What is the atomic number?The atomic number of an element is its total number of protons or the total number of electrons. The atomic number is written down the element. It can be calculated by knowing the numbers of protons and electrons.
The element here is silicon, whose number of protons, electrons, and neutrons are equal, which is 14. These are the charged particles that are present in the atoms of the element.
The number of band protons is equal to an element. The atomic number will be its number of protons. The isotope with 14 protons and 15 neutrons is Silicon-29.
Thus, the atomic number of the element is 14 if it has 15 protons and 14 Neutrons. The element is silicon.
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A pycnometer is a glass apparatus used for accurately determining the density of a liquid. When dry and empty, a certain pycnometer had a mass of 27.056 g. When filled with distilled water at 25.0°C, it weighed 36.773 g. When filled with chloroform (a liquid once used as an anesthetic before its toxic properties were known), the apparatus weighed 41.451 g. At 25.0°C, the density of water is 0.99704 g/mL
Complete Question
A pycnometer is a glass apparatus used for accurately determining the density of a liquid. When dry and empty, a certain pycnometer had a mass of 27.056 g. When filled with distilled water at 25.0°C, it weighed 36.773 g. When filled with chloroform (a liquid once used as an anesthetic before its toxic properties were known), the apparatus weighed 41.451 g. At 25.0°C, the density of water is 0.99704 g/mL
-What is the volume of the pycnometer (mL)
We have that the volume of the pycnometer in mL is
[tex]V=9.111mL[/tex]
From the Question we are told that
Pycnometer mass of [tex]m_p=27.056 g.[/tex]
Temperature [tex]T=25 \textdegree[/tex]
Pycnometer filled with distilled water [tex]m_{pf}= 36.773 g[/tex]
Apparatus weighed [tex]w=41.451 g[/tex]
Density of water [tex]\rho= 0.99704 g/mL[/tex]
Generally the equation for Density is mathematically given as
[tex]\rho=\frac{mass}{Volume}[/tex]
Since pycnometer is filled with water its volume can be defined by the volume of water in it
Therefore
Mass of water Pycnometer filled with distilled water-Pycnometer mass
[tex]M_w=36.773 -27.056\\\\M_w=9.084g[/tex]
Hence
[tex]V=\frac{9.084g}{0.99704 }[/tex]
[tex]V=9.111mL[/tex]
in conclusion
The volume of the Pycnometer in mL is
[tex]V=9.111mL[/tex]
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List the steps of the scientific method
Easy points, just don't be annoying.
Answer:
•1. Make an Observation
•2. Ask a question about ____
•3. Make a hypothesis (educated guess)
•4. Make a hypothesis-based prediction
•5. Test your hypothesis
•6. Graph the results and Iterate.
Answer:
The steps of the scientific method are:-
●Report the Results.
●Ask a Question.
●Test the prediction.
●Make an observation.
●Form a hypothesis, or testable explanation.
●Make a prediction based on the hypothesis.
An unknown element is a mixture of isotopes ¹²⁹X and ¹³²X. The average atomic mass of X is 131.01 amu. What is the percent abundance of ¹³²X?
Answer: 67%
Explanation: The weighted averages of the two isotopes must add to 131.01. Let Y be the percentage of isotope 129. Then (1-Y) will be the percentage of isotope 132. The weighted average of each is:
129: 129Y
132: 132(1-Y)
Their sum is equal to 131.01
129Y + 132(1-Y) = 131.01
Y = 0.33, or 33%
(1-Y) = 0.67, or 67%
Check: 129*(0.33) = 42.57
132*(0.67) = 88.44
Sum = 131.01 It checks OK The 132 isotopes is 67% of the sample.
Considering the definition of atomic mass, isotopes and atomic mass of an element, the percent abundance of ¹³²X is 67%.
Definition of atomic massFirst of all, the atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.
Definition of isotopeThe same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.
Definition of atomic massOn the other hand, the atomic mass of an element is the weighted average mass of its natural isotopes. In other words, the atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.
Percent abundance of ¹³²XIn this case, you know:
An isotope has an atomic mass of 132 amu and a percent natural abundance of y.An isotope has an atomic mass of 129 amu and a percent natural abundance of 1-y. The average atomic mass of X is 131.01 amuThen, the average mass of X can be calculated as:
132 amu×y + 129 amu×( 1-y)= 131.01 amu
Solving, you can find the percent abundance of ¹³²X:
132 amu×y + 129 amu×1 - 129 amu×y= 131.01 amu
132 amu×y + 129 amu - 129 amu×y= 131.01 amu
132 amu×y - 129 amu×y= 131.01 amu - 129 amu
3 amu×y= 2.01 amu
y= 2.01 amu÷ 3 amu
y= 0.67= 67%
Finally, the percent abundance of ¹³²X is 67%.
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A cylinder fitted with a movable piston and filled with a gas has a volume of 188.5mL at 26.7 °C when the applied pressure is 755.2 torr. The temperature of the oil bath surrounding the cylinder was increased to 165.2 °C, and the load on the piston was changed. Careful measurement now gave a value of 210.5mL for the volume. What was the final pressure in the system, in torr? Select one:
O a. 715.5 tor O b. 576.9 torr Oc. 988 6 torr O d. 1233 torr 462.6 tor
Answer:
C
Explanation:
To find the new pressure, we will use this formula: P₁V₁/T₁ = P₂V₂/T₂
P₁ = Original pressure (755.2)
V₁ = Original volume (188.5)
T₁ = Original temperature in kelvins (26.7 + 273.15 = 299.85)
P₂ = Final Volume (?)
V₂ = Final volume (210.5)
T₂ = Final temperature in kelvins (165.2 + 273.15 = 438.35)
Here is our equation
(755.2)(188.5)/(299.85) = (210.5)P₂/(438.35)
Hopefully, you have a calculator handy because this equation will end up looking like this:
474.75471 = (0.48021)P₂
Divide both sides by the coefficient
474.75471/0.48021 = (0.48021)P₂/0.48021
P₂ = 988.64
Would overheating be a stimulus or a
response?
Stimulus
Response
Answer:
stimulus response
Explanation:
its stimulus response
