How does the environment play an important role in creating petrified fossils?
Answer:The right conditions need to be present in order for fossilization to occur.
Drier environments, such as land, are more susceptible to the effects of erosion and so it is more difficult to preserve the organism before it decays.
#CARRYONLEARNING #STUDYWELLwhich category of hurricanes cause the greatest damage
Answer:
The Saffir-Simpson Hurricane Wind Scale is a 1 to 5 rating based on a hurricane's sustained wind speed. This scale estimates potential property damage. Hurricanes reaching Category 3 and higher are considered major hurricanes because of their potential for significant loss of life and damage.
Explanation:
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Classify each solvent as protic or aprotic. a. (CH3)2CHOH c. CH2Cl2 e. N(CH3)3 b. CH3NO2 d. NH3 f. HCONH2
Answer:
The protic solvents are (CH3)2CHOH, NH3, and HCONH2
The aprotic solvent are CH3NO2, CH2Cl2, and N(CH3)3
Explanation:
A protic solvent is a solvent that has a hydrogen atom bound to an oxygen (O), a nitrogen (N), or fluoride (F). Generally, any solvent that contains a labile H⁺ is called a protic solvent.
a. (CH3)2CHOH
(CH3)2CHOH is a protic solvent because one of the hydrogens is bound to oxygen (O)
b. CH3NO2
CH3NO2 is an aprotic (i.e not a protic solvent) solvent because all the hydrogens are bound to carbon.
c. CH2Cl2
CH2Cl2 is an aprotic solvent because all the hydrogens are bound to carbon.
d. NH3 is a protic solvent because all the hydrogens are bound to Nitrogen (N)
e. N(CH3)3 is an aprotic solvent because all the hydrogens are bound to carbon
f. HCONH2 is a protic solvent because two of the hydrogens are bound to Nitrogen (N)
Which subatomic particle of an atom moves around nucleus
Answer:
B. Electrons
Explanation:
How many valence electrons does group 18 have
Answer:
group 18 has 8 valence electrons, that's why they are stable.
8!
Explanation:
You're looking at the very last column, right? Noble gases are known for their stability because their valence shells are full! Lucky for you, all you have to do to know the number of valence electrons is look at the column number and take ignore the 1! 16 becomes 6, 18 becomes 8.
I really need help with these someone please help me.
3 x 10^4
8 x 10
Compare What do infrared technologies, fiber optic
technologies, and satellite technologies all have in
common?
Answer:
ptic fiber communication and satellite communication are the leading technologies which are revolutionizing the world of telecommunications. Both technologies have their advantages and limitations which make them suitable for certain type of applications. This article will provide an overview of optic fiber and satellite communication technologies and present a comparison of the features and related issues.
Optic Fiber Communication
Optic Fiber communication transmits information by sending pulses of light (using laser) through an optic fiber. The low signal loss in optic fibers and high data rate of transmission systems, allow signals with high data rates (exceeding several Gbps) to travel over long distances (more than 100 km) without a need of repeater or amplifier. Moreover, using wavelength division multiplexing (WDM) allows a single fiber to carry multiple signals (upto 10 different signals) of multi-Gbps transmissions. Optic Fiber communication offers extremely high bandwidth, immunity to electromagnetic interference, non-existent delays and immunity from interception by external means. In the 1980s and 1990s, the continents were linked together using undersea optic fiber bringing about a paradigm shift in the global telecommunications.
These advancements in optic fiber communication has resulted in decrease of satellite communications for several types of communications. For instance, transmission between fixed locations or point-to-point communications, where large bandwidths are required (such as transoceanic telephone systems) are made through optic fiber instead of using satellite communication. Optic Fiber communication is also used to transmit telephone signals, Internet communication, LAN (Gigabit LAN) and cable television signals.
Satellite Communication
Satellite communications use artificial satellites as relays between a transmitter and a receiver at different locations on Earth. Satellite systems allow users to bypass typical carrier offices and to broadcast information to multiple locations. Communications satellites are used for radio, TV, telephone, Internet, military and other applications. There are more than 2,000 satellites around Earth’s orbit, being used for communication by both government and private organizations.
Communication Satellites are LOS (line-of-sight) microwave systems with a repeater. These satellites rotate around the earth with the speed of earth and are known as geostationary satellites. The limitations of antenna size also limits focusing capability making the coverage for a single satellite transmitter very large. This makes satellite communication ideal for TV and radio services as the signal has to flow from a single point to many points in a single direction. The large distance of satellites from the earth (about 22,300 miles) results in delays which adversely effects two-way communication like mobile conversations. Low earth orbit satellites can be used for two-way mobile communication because less power is required to reach those satellites.
Explanation:
On a mission to a newly discovered planet, an astronaut finds gallium abundances of 60.11 % for 69Ga and 39.89 % for 71Ga. What is the atomic mass of gallium for this location
Answer:
69.79
Explanation:
According to this question, Gallium element (Ga) has two isotopes namely: 69Ga and 71Ga respectively.
- Isotope 69Ga contains a percent abundance of 60.11 %, the decimal abundance= 0.6011
- Isotope 71Ga contains a percent abundance of 39.89 %, the decimal abundance = 0.3989
Atomic mass of Ga = (mass of isotope 1 × decimal abundance) + (mass of isotope 2 × decimal abundance)
Atomic mass of Ga = (0.6011 × 69) + (0.3989 × 71)
Atomic mass of Ga = 41.4759 + 28.3219
Atomic mass of Ga = 69.797
Atomic mass of Gallium = 69.79
What is the name of the compound Hg4SiO4?
Answer:
mercury (I) silicate
Explanation:
Determine whether or not each chemical formula is an empirical formula. C6H12O6 CaCO3 NaMnO4 Ba3(PO4)2 K2C2O4
Answer:
- C6H12O6 is not an empirical formula because it can be simplified to CH2O.
- CaCO3 is an empirical formula as well as molecular formula because it has been simplified up to the smallest subscript per atom.
- NaMnO4 is an empirical formula as well as molecular formula because it has been simplified up to the smallest subscript per atom.
- Ba3(PO4)2 is an empirical formula as well as molecular formula because it has been simplified up to the smallest subscript per atom.
- K2C2O4 is not an empirical formula because it can be simplified to KCO2.
Explanation:
Hello!
In this case, since the empirical formulas are referred to those formulas that have been simplified up to the smallest whole number for each subscript per atom, we can see that:
- C6H12O6 is not an empirical formula because it can be simplified to CH2O.
- CaCO3 is an empirical formula as well as molecular formula because it has been simplified up to the smallest subscript per atom.
- NaMnO4 is an empirical formula as well as molecular formula because it has been simplified up to the smallest subscript per atom.
- Ba3(PO4)2 is an empirical formula as well as molecular formula because it has been simplified up to the smallest subscript per atom.
- K2C2O4 is not an empirical formula because it can be simplified to KCO2.
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How does the number of molecules in 1 mol of oxigen compare with the number of molecules in 1 mol of nitrogen?
Answer:
They are the same.
Explanation:
Hello!
In this case, according to the Avogadro's number, we take into account that for molecules such as gaseous oxygen (O₂) and nitrogen (N₂), we realize that 1 mole of these contain 6.022x10²³ moles of molecules; as we are given 1 mol each, we notice they both have 6.022x10²³ molecules, therefore, they number of molecules is the same because they have the same number of moles.
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1. Which of the following would be an example of spontaneous
generation?
Answer:
This is the idea of spontaneous generation, an obsolete theory that states that living organisms can originate from inanimate objects. Other common examples of spontaneous generation were that dust creates fleas, maggots arise from rotting meat, and bread or wheat left in a dark corner produces mice
Explanation:
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Explain two benefits that the flea get from living on a dog.
Answer:
Benefits of the flea from living on a dog
Explanation:
They feed on the blood of the dog. They deliver about 4000 eggs on the hosts fur.
The + symbol, on the products side, in a chemical equation means
Explanation:
Used to separate one reactant or product from another
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If you have access to stock solutions of 1.00 M H3PO4, 1.00 M of HCl, and 1.00 M NaOH solution, (and distilled water of course), what volumes of each would you mix before diluting to a final volume of 2.00 L to prepare 2.00 L of pH 7.40 buffer with a final total concentration of 50 mM of phosphorous contains species (e.g. so that [H3PO4] [H2PO4 - ] [HPO4 2- ] [PO4 3- ]
Answer:
0.10L of 1.00M of H₃PO₄ and 0.1613L of 1.00M NaOH
Explanation:
The pKa's of phosphoric acid are:
H₃PO₄/H₂PO₄⁻ = 2.1
H₂PO₄⁻/HPO₄²⁻ = 7.2
HPO₄²⁻/PO₄³⁻ = 12.0
To make a buffer with pH 9.40 we need to convert all H₃PO₄ to H₂PO₄⁻ and an amount of H₂PO₄⁻ to HPO₄²⁻
To have a 50mM solution of phosphoures we need:
2L * (0.050mol / L) = 0.10 moles of H₃PO₄
0.10 mol * (1L / mol) = 0.10L of 1.00M of H3PO4
To convert the H₃PO₄ to H₂PO₄⁻ and to HPO₄²⁻ must be added NaOH, thus:
H₃PO₄ + NaOH → H₂PO₄⁻ + H₂O + Na⁺
H₂PO₄⁻ + NaOH → HPO₄²⁻ + H₂O + Na⁺
Using H-H equation we can find the amount of NaOH added:
pH = pKa + log [A⁻] / [HA] (1)
Where [A-] is conjugate base, HPO₄²⁻ and [HA] is weak acid, H₂PO₄⁻
pH = 7.40
pKa = 7.20
[A-] + [HA] = 0.10moles (2)
Replacing (2) in (1):
7.40 = 7.20 + log 0.10mol - [HA] / [HA]
0.2 = log 0.10mol - [HA] / [HA]
1.5849 = 0.10mol - [HA] / [HA]
1.5849 [HA] = 0.10mol - [HA]
2.5849[HA] = 0.10mol
[HA] = 0.0387 moles = H₂PO₄⁻ moles
That means moles of HPO₄²⁻ are 0.10mol - 0.0387moles = 0.0613 moles
The moles of NaOH needed to convert all H₃PO₄ in H₂PO₄⁻ are 0.10 moles
And moles needed to obtain 0.0613 moles of HPO₄²⁻ are 0.0613 moles
Total moles of NaOH are 0.1613moles * (1L / 1mol) = 0.1613L of 1.00M NaOH
Then, you need to dilute both solutions to 2.00L with distilled water.
Which branch of chemistry would be used by physicians when deciding
what kinds of medicines to prescribe?
Explanation:
Medicinal chemistry and pharmaceutical chemistry are disciplines at the intersection ofchemistry, especially synthetic organicchemistry, and pharmacology and various other biological specialties, where they are involved with design,chemical synthesis and development for market of pharmaceutical agents, or bio-active ...
How can you tell the difference between a strong acid and a weak one?
A. Strong acids release 1 hydrogen, weak acids release 2 hydrogens.
B. Strong acids are diprotic and release 2 hydrogens, weak acids only release 1 hydrogen.
OC. Weak acids dissociate fully, strong acids only partially dissociate.
D. Strong acids dissociate fully, weak acids only partially dissociate.
Acids are hydrogen donating substances that are weak and strong. The weak acids partially dissociate while the strong completely dissociate in solution. Thus, option D is correct.
What are strong and weak acids?
Strong acids are the acids that get completely ionized and dissociated in a solution and hence have the maximum hydrogen or hydronium ions (protons) released in the solution.
The weak acids are the acids that partially dissociate into their ions in the solution, determine their strength, and produce less hydrogen or proton ions in the solution.
Acetic acid, formic acid, oxalic acid, benzoic acid, etc., are weak acids, whereas sulfuric acid, nitric acid, hydrochloric acid, chloric acid, etc., are strong acids.
Therefore, the dissociation differentiates the weak and strong acids.
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Calculate the volume in milliliters of a 5.11/mol silver nitrate solution that contains 175.g of silver nitrate AgNO3. Round your answer to 3 significant digits.
Answer:
[tex]V=202mL[/tex]
Explanation:
Hello!
In this case, considering we have a 5.11-molar solution (5.11 M) that contains 175. g of silver nitrate, we first need to compute the moles of solute as its molar mass is 169.87 g/mol:
[tex]n=175g*\frac{1mol}{169.87 g} =1.03mol[/tex]
Next, since the definition of molarity is moles over volume:
[tex]M=\frac{n}{V}[/tex]
We solve for the volume and plug in the molarity and moles as shown below:
[tex]V=\frac{n}{M} =\frac{1.03mol}{5.11mol/L}\\\\V =0.202L[/tex]
However, as it is needed in milliliters, we convert the L to mL:
[tex]V=0.202L*\frac{1000mL}{1L}\\\\V=202mL[/tex]
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In a polar reaction mechanism, the atom that gives away electrons in a neutral nucleophile will end up as a(n):
The question is incomplete, the complete question is shown in the image attached.
Answer:
Cation
Explanation:
In a polar reaction mechanism, a specie must give out electrons and another specie must accept those electrons.
The specie that gives out electrons becomes electron deficient and positively charged so we refer to such a specie as a cation.
Hence, the specie that looses electrons becomes a cation.
Is sound matter?? Please help me..
Answer:
No sound Is not matter Sound and light are not considered matter and was never matter
Explanation:
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The isotope carbon-14 decays over time into nitrogen-14 with a half-life of 5,730 years. Suppose that you find a fossil that contains 1.25 grams of carbon-14 and 3.75 grams of nitrogen-14. How old is the fossil
Answer:
11460 years
Explanation:
0.693/t1/2 = 2.303/t log (No/N)
t1/2 = half life of the carbon
t = age of the fossil
No= amount of radioactive material originally present
N= amount of radioactive material present at time=t
No= mass of carbon + nitrogen = 5g
0.693/5730 = 2.303/t log (5/1.25)
1.21 ×10^-4 = 1.3866/t
t= 1.3866/1.21 ×10^-4
t= 11460 years
What is the density of methane, CH4 in a vessel where the pressure is 910 torr and the temperature is 255 K
Answer: Density of methane is 0.92 g/L
Explanation:
The relation between density and molar mass is :
[tex]d=\frac{PM}{RT}[/tex]
where , d = density
P = pressure = 910 torr = 1.20 atm (760 torr=1atm)
M = molar mass = 16 g/mol ( for methane)
R = gas constant = [tex]0.0821Latm/Kmol[/tex]
T = temperature = 255 K
Putting the values :
[tex]d=\frac{1.20atm\times 16g/mol}{0.0821Latm/Kmol\times 255K}=0.92g/L[/tex]
Thus density of methane is 0.92 g/L
methods for maximizing crystal growth , explain how?
Answer:
meth
Explanation:
YOu get chemicals and mix them together yes you do
Evaluate (754 mm)/(41 s) to three significant figures and express answer in SI units using an appropriate prefix.
1.14m x MG is the answer
The core of the Earth provides the
heat that creates the convection
currents of the mantle and drives
the tectonic plates. Describe what
would happen as the Earth's core
cools down over billions of years?
Answer:
When the molten outer core cools and becomes solid, a very long time in the future, the Earth's magnetic field and atmosphere will disappear.
Matter are anything that is made up of atoms. The quantity of matter can be observed only on the basis of mass and volume calculation. Therefore, the magnetic field will vanish a very lot longer after the liquid outer core solidifies and cools.
What is matter?Matter is a substance that has some mass and can occupy some volume. The matter is mainly used in science. Matter can be solid, liquid or gas.
Matter is anything that is made up of atoms. Anything around us that can be physically seen and touched are matter. Ice, water and water vapors are example of matter.
So as we saw that matter has some mass so mass can be measured in gram only. Mass can also be represented as number of molecules. We also saw that matter occupy some volume and that volume is measured only in liter. The magnetic field or atmosphere will vanish a very lot longer after the liquid outer core solidifies and cools.
Therefore, the magnetic field or atmosphere will vanish a very lot longer after the liquid outer core solidifies and cools.
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How many moles of lead, Pb, are in 1.50 x 10^12 atoms of lead?
2.49 × 10⁻¹² moles Pb
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Using Dimensional AnalysisAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Explanation:Step 1: Define
1.50 × 10¹² atoms Pb
Step 2: Identify Conversions
Avogadro's Number
Step 3: Convert
Set up: [tex]\displaystyle 1.50 \cdot 10^{12} \ atoms \ Pb(\frac{1 \ mol \ Pb}{6.022 \cdot 10^{23} \ atoms \ Pb})[/tex]Multiply: [tex]\displaystyle 2.49087 \cdot 10^{-12} \ moles \ Pb[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
2.49087 × 10⁻¹² moles Pb ≈ 2.49 × 10⁻¹² moles Pb
The reactants are
A
the substances present when the reactions begins.
B
the substances present when the reaction is complete.
C
the properties that change after the reaction.
D
the energy that is released or stored during the reaction.
A is the answer! A chemical reaction always starts with the reactants and ends with a product!
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Explanation:
The reactants are simply the substances present when a reaction begins.
Reactants are as opposed to products. The latter are substances that are present when a reaction is complete.
Reactants generally undergo chemical changes before they can form products. The chemical changes involve the breakage of old and the formation of new bonds among atoms of different elements that make up the reactants.
Reactants also need to summon an energy barrier before products can be formed. the energy barrier is known as activation energy.
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What type of succession takes place when a community starts to grow?
A. Primary
B. Secondary
Answer:
Primary
Explanation:
Succession is a series of progressive changes in the composition of an ecological community over time. In primary succession, newly exposed or newly formed rock is colonized by living things for the first time.
Britney found an irregularly shaped metal object on the beach that has a mass of 232.5 grams. To determine the volume, she partially filled a cylindrical water bottle and dropped the object in. The water level in the bottle rose by 1.2 cm. The bottle has a diameter of 5 cm. Calculate the density of the metal to determine what type of metal Britney found. Densities, measured in grams per cubic centimeters, g cm3 , for some common metals are listed.
The question is incomplete, the complete question is;
Britney found an irregularly shaped metal object on the beach that
has a mass of 232.5 grams. To determine the volume, she partially
filled a cylindrical water bottle and dropped the object in. The
water level in the bottle rose by 1.2 cm. The bottle has a diameter
of 5 cm. Calculate the density of the metal to determine what type
of metal Britney found. Densities, measured in grams per cubic
centimeter, g
cm3
, for some common metals are listed.
• Copper: 8.86 g
cm3
• Bronze: 9.87 g
cm3
• Silver: 10.5 g
cm3
• Gold: 19.3 g
cm3
Select the word that correctly completes the sentence.
Based on the density of the metal, it is most likely that the metal Britney
found is _______________.
\ copper
\ bronze
\ silver
\ gold
Answer:
Bronze: 9.87 g
bronze
Explanation:
We know that the volume of the liquid = the volume of the object
This is because the object will cause the liquid to occupy its own volume of the container.
Now; area of the container = πr^2 = 3.142 * (5/2)^2 = 19.635 cm^2
Volume of the liquid = volume of the sold = 19.635 cm^2 * 1.2 cm= 23.562cm^3
Now given that;
Density = mass/volume = 232.5 g/23.562cm^3 = 9.87 g/cm^3
what term is best described as the logarithmic measure of the concentration of hydronium ions in a solution
Answer:
pH
Explanation:
We define the pH of a solution as the negative logarithm of hydronium ions concentration in solution.
Thus when we want to define pH mathematically, we write;
pH = - log {H3O^+]
Where;
{H3O^+] means the concentration of hydronium ions in solution.
4.How many atoms of silver are in 100 grams of silver?
Answer:
5.58x1023Agatoms 5.58 x 10 23 A g a t o m s
Explanation:
After determining the moles of the sample, we can convert it to the number of atoms using the Avogadro's number.