The first step that geologists must do to compare rock layers at distant locations is identify index fossils In one or more layers at one location.
The remains of ancient organisms, such as plants and animals, that were preserved from the prehistoric era by the influence of natural conditions are known as fossils.Any plant or animal that has been preserved in the Earth's rock record and is specific to a certain geologic period or environment is an index fossil.The correlation of strata and the establishment of time scale boundaries in geology are both based on index fossils.A suitable index fossil needs to be unique or easily identifiable, plentiful, have a broad geographic distribution, and have a limited time range.Index fossils are regarded as often discovered, widely dispersed, and disseminated fossils that are scarce in the time period.Learn more about fossils here:
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.115km=_______cm
Please I need help!
Explanation need I know the answer!
Answer:
115km is equal to 11500000cm
Explanation:
Use the information from the article to answer the question. why is pluto now called a dwarf planet?
Answer:
coz it doesn't meet the three criteria the iau uses to define a full sized planet
Explanation:
it meet all other except one :has no cleared its neighboring region of other object
Wood tends to be hard and relatively inflexible, especially when it's been dried. This is why wood is an excellent building material.
Answer:
Explanation:
Physical Property
Explanation:
Hardness is the physical property
does baking soda make cake rise
Answer: Yes it can help make cake rise.
Explanation: Its a leavening agent and its a good ingredient for baking.
in a technique used for surface analysis called auger electron spectroscopy (aes), electrons are accelerated toward a metal surface. these electrons cause the emissions of secondary electrons (called auger electrons) from the metal surface. the kinetic energy of the auger electrons depends on the composition of the surface. the presence of oxygen atoms on the surface results in auger electrons with a kinetic energy of approximately 512 ev .
We've to find it inadequately weight thing at the admitted election if we know it carries the kinetic energy. Now we've to figure out the relationship between the very post in order to set up our equation. So we know we are looking for the weight length and we've been handed with the kinetic energy.
Now we know that Connect energy has a relationship with the haste. If we are going to rearrange the question then we've two times kinetic energy equals to mass haste forecourt or haste forecourt. You close to two times collected energy that bothered by the mass were haste because the square root of two times connected energy over the mass Right then. Now we've a relationship. They'd kinetic energy on the haste as well.
And now we just have to associate a haste with the wavelength can do this. It's close to cranks constant divided by the instigation we know Constant has a number of 6.63 times 10 to the power of native 34. rather of jewels per second, we are going to use kilograms either square per second, because on the weight of the electron then, which is9.1 times 10 to the power negative 31 we also have a kilogram. So we've to have a kilogram over there to cancel it now onto the haste. It's going to be a big bone , no, two times the kinetic energy, which is five or six. So we've to do a conversion of ev to 1.602 times 10 to the power of negative 19 augar developed by the mass again, which is9.1 times 10 to the power of -0.545 is the final answer.
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considering the equation for the oxidation of glucose, the cell must have a constant supply of carbon dioxide for this reaction to occur. group starts
The statement would be false as the given equation for the oxidation of glucose, the cell must have a constant supply of carbon dioxide for this reaction to occur. The statement is false because the Carbon Dioxide (CO2) is a product not a reactant.
The oxidation of glucose in the presence of oxygen in the chemical reaction is known as respiration. It is very important for human metabolism rate. It helps proper growth of human metabolism rate and maintain the human body and immune system. The given chemical reaction is :
Glucose (C6H12O5) + 6 O2 -------> 6 Carbon Dioxide (CO2) + Water
The given question is incomplete. The complete question would be Considering the equation for the oxidation of glucose, the cell must have a constant supply of carbon dioxide for this reaction to occur.
You have to mentioned the above statement as True or False.
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1. Explain why the lattice disassociation enthalpy of magnesium chloride is greater than that of calcium chloride
2. Explain why the lattice disassociation enthalpy of magnesium oxide is greater than that of magnesium chloride
The difference in lattice energies between MgCl2 and CaCl2 is 269 kJ.
2. lattice disassociation enthalpy of magnesium oxide is greater than that of magnesium chloride.
because magnesium chloride consist of 3 ions in total , whereas magnesium oxide has 2 ions and oxide ions are smaller than chloride ions, Which means that the ions are closer together in the lattice of magnesium oxide than magnesium chloride , and which also increases the strength of the attractions.
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a chemist needs to know the mass of a sample of caco3 to 2 significant digits. he puts the sample on a digital scale. this is what the scale shows: 0 0 0 2 4 . 0 g if this measurement is precise enough for the chemist, round it to 2 significant digits.
The mass of the CaCo3 to 2 significant numbers = 24 g
In any type of scientific dimension, the perfection of the dimension is represented in the significant integers of that dimension. It also used to show the dimension to the necessary degree of delicacy.
Significant integers comprises every number except the leading zero( s). And if the number after the needed significant integers isn't over to 5, it's rounded down and the needed significant integers is written as is. But if the number after the needed significant integers is at least 5, it rounded up, and the last number on the significant integers demand is increased by a factor of 1.
Exemplifications include :
0.3547 = 0.355 to 3s.f(0.0007 is rounded up to increase the coming number, 4, by a factor of 1)
Hence, the answer would be 24 g
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What is the concentration of chloride ions in a 0.349 m solution of sodium chloride?
Calculate the frequency of yellow light with a wavelength of 580 x 10–9 m.
Answer:
5791
Explanation:
Easy peasy lemon squeazy
Enter a balanced chemical equation for the reaction of solid rubidium with liquid water.
The balance chemical reaction or equation for the given question is :
2Rb (Rubidium) (s) + 2H₂O (Water) (l) → H₂ (Hydrogen) (g) + 2RbOH (Rubidium Oxide) (l)
Rubidium (Rb) is an alkali metal in the similar group (Group I) as sodium (Na) and as one goes down the periodic table of group the ionization energy decreases (downfall).Hence Rubidium (Rb) also reacts with water goes to the creation of hydrogen gas. Its reaction with water (H2O) is same to that of sodium (Na).
To Balance a Chemical Equation we need to mention the algebraic terms both the sides.
Balancing a Chemical Equation is related to law of conservation of mass.
To Balance a Chemical Equation , place portions as demanded in front of the symbols of formulas so the same number of each type of snippet occurs in both reactants and products.
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when do you use the roman numerals when naming ionic compounds
Oxidation State
In chemistry, when naming ionic compounds there will sometimes be a roman numeral after the first element. This number represents the oxidation state of the element. An oxidation state is defined as the hypothetical charge of an atom, assuming that all of its bonds are fully ionic. In other words, the oxidation state shows how many electrons an atom gives or receives after ionization.
In ionic compounds, there will only ever be a roman numeral after the first element. This element will always be the cation (positively charged ion). So, the roman numeral will show how many electrons each cation gave.
When Roman Numerals are Necessary
This is necessary when you deal with transition metals or any other element that has multiple oxidation states. For example, iron can give 2 or 3 electrons. So, when naming a compound with iron you need to use a (II) or (III) to show how many electrons each iron atom gave.
When Roman Numerals are Unnecessary
On the other hand, roman numerals are unnecessary when using an element that only has one possible oxidation state. For example, Na can only give 1 electron ever, so it does not need a roman numeral. Additionally, elements in the second group like Mg can only ever give 2 electrons, so they also don't need a roman numeral to follow their name.
what is the naming for TiO?
Answer:
Titanium oxide.
Explanation:
Relative to other substances, water tends to resist changes in temperature. Why?.
Relative to the other substances, water tends to resist changes in temperature because water is highly cohesive.
Molecules of water tends to resist increases in their motion. When water is heated, some of the energy is used to disturb the hydrogen bonds between the neighboring molecules. Bond between two water molecules is the hydrogen bond.
The tendency of water molecules to stay close to each other is due to the strong hydrogen bonding between the atoms. This strong hydrogen bond causes water to resist motion of molecules and remain at room temperature.
Specific heat of water is really high due to which water resist the temperature change. A lot of heat is required to move the water slightly and resist the temperature changes. Heat gets absorbed when the hydrogen bonds break.
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Use the atomic mass of lithium to calculate the relative abundances of the two isotopes. express your answers using one decimal place. enter your answers separated by a comma.
The relative abundance of the isotopes is 2.3137.
How do we calculate relative abundances?
The relative abundance for a specific ion in the sample can be calculated by dividing the number of ions with a particular m / z m/z m/z ratio by the total number of ions detected.
Relative abundance = [tex]\frac{m}{z}[/tex]
The atomic masses of Li are 6.941amu.
The atomic number of Li is 3
Relative abundance = [tex]\frac{6.941}{3}[/tex]
Relative abundance = 2.3137
The relative abundance of the isotopes is 2.3137.
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The isotopes have a relative abundance of 2.3137.
What is relative abundance?A species' relative abundance is determined by how many of that species there are in relation to all the other organisms in the area. Among the most well-known and extensively researched patterns in macroecology, relative species abundances frequently follow certain patterns.
Relative abundance = m/z
The atomic masses of Li are 6.941amu.
The atomic number of Li is 3
Relative abundance = 6.941/3
Relative abundance = 2.3137
The isotopes have a relative abundance of 2.3137.
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How many atoms are there in 2.68 grams of aluminum (Al)?
A)28.8 x 1023 atoms
B)5.98 x 1022 atoms
C)2.86 atoms
D)0.099 atoms
How many protons, neutrons, and electrons are there?
Answer:
proton-27
electron-25
neutron-35
Explanation:
____ is an example of a substance that is not soluble.
(I have to fill in the blank.)
Answer:
Substance
Explanation:
Substances that do not readily dissolve in water can be described as hydrophobic substances. Hydrophobic substances are those which when exposed.
decigrams
centimeters =
The conversion of decigrams into centigrams would not be possible as these are two different quantities.
here the decigrams is used to measure the mass of the substance and centimeters are used to measure the length of the substance.The decigrams are used in laboratory used in measuring of precise laboratory experiments.It is used to measure the very small weight and the weight is 1/10 of grams.Decagram used in matrix system.For example the tea contain 1 decigram of caffeine that means 100 mg of caffeine so its is difficult for us to calculate the small value , so we measured the mass of caffeine into higher value that is kilogram.So the amount of caffeine is 0.000 1 kilograms.using decigram for measuring the quantity is bit difficult.While centigrams are used to measure the length , breadth, and height of the product.Hence two different quantities cannot be converted and there is no relationship between them.
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One limatation to science is that it cannot answer questions about________
One limitation to science is that it cannot answer questions about morality.
What are science limitations?Science is defined as the systematic study of a structure through careful experiment and observations.
However, there are limitations that are encountered in the field of science which include the questions that science cannot answer.
Some of the limitations of science include the following:
Questions about value.Questions of morality.Questions about the supernatural.Questions concerning ultimate reality.Science cannot answer the question of morality because it doesn't have a link of how man makes his judgement through his consciousness and how ethics, scope of cultural, religious and social influences affects his decisions.
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Calculate the maximum wavelength of light capable of dissociating the cl–f bond in one molecule of chlorine monofluoride if the bond energy, or bond dissociation energy, is 251 kj/mol.
According to bond energy, the maximum wavelength of light is 475 nanometers.
We need to know about bond energy to solve this problem. Bond energy is the energy needed to bond other atoms in the molecule. To determine the energy in one molecule of chlorine monofluoride, we can use this formula:
E = BE / Na
where E is the energy of photon, BE is bond energy and Na is Avogadro's number (6.02 x 10²³ atoms/mol)
Now, we can calculate the shortest wavelength by using Einstein's equation for photon energy:
E = h . c / λ
where h is Planck constant (6.6 x 10¯³⁴ J.s), c is the speed of light (3 x 10⁸ m/s) and λ is the wavelength.
From the question above, we know that
BE = 251 kJ/mol = 251 x 10³ J/mol
By substituting the given parameters, we can calculate the maximum wavelength
E = BE / Na
h . c / λ = 251 x 10³ / 6.02 x 10²³
6.6 x 10¯³⁴ . 3 x 10⁸ / λ = 251 x 10³ / 6.02 x 10²³
λ = 4.75 x 10¯⁷ m
λ = 475 nm
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Im confused HELPP PLEASE BRAINLY
These are what are supposed to go in the blanks:
yellow
red/orange
blue
purple
colorless
white
red/pink
red
Answer:
Explanation:
l bozo
Cylinder containing 22ml. The mercury used to fill the cylinder weighs 308 g. from this information, calculate the density of mercury
The density of the mercury is 14 gm/ml.
Given,
Volume of cylinder = 22 ml
Mass of mercury in the cylinder = 308 g
We have to find the density of the mercury.
The density of any substance is defined as the mass per unit volume of the substance. Or, it is the ratio of mass to volume. The units of density are kg/m³, g/ml, or g/cm³. Each substance has its own density. It is the mass of an object compared with its volume.
It is given by the formula:
Density = Mass/ volume
Density = 308 gm/ 22 ml
Density = 14 gm/ml
Hence, the density of mercury is 14 gm/ml.
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What does pH measure? What 2 ions are equal in a neutral pH of 7?
Answer:
Basically it measures the acidity or alkalinity of a substance.
Why do courtship behaviors usually happen in response to seasonal changes? (1 point)
Responses
to ensure that mating does not interfere with migration season
to ensure that mating does not interfere with migration season
to ensure that offspring are born in optimal survival conditions
to ensure that offspring are born in optimal survival conditions
to ensure that mating happens in optimal survival conditions
to ensure that mating happens in optimal survival conditions
to ensure that offspring do not interfere with migration season
Courtship behaviours usually happen in response to seasonal changes to ensure that mating does not interfere with migration season. So the correct option is A.
What are courtship behaviours?Animals engage in courting behaviour, which leads to mating and eventual reproduction. Depending on the quantity of chemical, optical, or aural inputs involved, courtship can be quite basic or extremely complicated, comprising a variety of activities performed by two or more people.
To entice a partner, many species turn to courtship feeding. Some insect species' females employ odorous compounds known as pheromones to draw males in close proximity, like the spongy moth Lymantria dispar. On spring nights, much of the world can hear the courting choruses of frogs of the Rana species and the touching courtship rituals of male painted turtles, Chrysemys species.
Therefore the correct option is A.
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6. A(n) is a material made of two or more metals.
O molecular compound
O alloy
ionic compound
O mineral
Answer:
alloy
Explanation:
an alloy is formed when two metals are chemically combined together to form a compound
what can be said of a compound whose liquid has a freezing point of 82°c? what can be said of a compound whose liquid has a freezing point of 82°c? the solid sublimes at 41°c the liquid has a boiling point of 164°c the solid has a melting point of 82°c the solid has a melting point of 41°c
A compound whose liquid has a freezing point of 82 deg C , the compound that is the solid is said to be have the melting point (MP) of 82 deg C.
The answer is 82 deg C because freezing of any liquid is an equilibrium process.
It is equilibrium process because at 0 deg C , the number of H2O molecules becoming ice is equal to the H2O molecules as ice melting from to form a liquid water.
The rate of freezing water is equal to the rate of melting of ice.
Thus, there is an equilibrium between solid and liquid water.
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Which of the following pairs of atoms is unlikely to form a compound?
Responses
potassium (K) and iodine (I)
potassium (K) and iodine (I)
iron (Fe) and sulfur (S)
iron (Fe) and sulfur (S)
calcium (Ca) and chlorine (Cl)
calcium (Ca) and chlorine (Cl)
neon (Ne) and argon (Ar)
The pair of atoms that is unlikely to form a compound are neon (Ne) and argon (Ar) (option D).
What are compounds?Compounds are substances that are formed by chemical bonding of two or more elements in definite proportions by mass.
Elements combine to form compounds by sharing, donating or gaining electrons. For example, metals donate electrons to nonmetals to form metallic or ionic bonds.
However, noble gases are elements that have a completely filled shells, hence, do not engage in chemical bonding. Examples of noble gases are argon, helium, neon etc.
Therefore, the pair of atoms that is unlikely to form a compound are neon (Ne) and argon (Ar).
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Describe how these 15 electrons are arranged in a
arranged in a phosphorus atom.
Electronic arrangement of phosphorus is 2,8,5 and its electronic configuration is 1s2 2s2 2p6 3s2 3p3.
The element phosphorus belongs to group 5A of the periodic table and has 15 protons. It is a highly reactive non-metal. It is typically found as ionic compounds in nature where it has reacted with metals.We must first examine the phosphorus Bohr diagram in order to identify the electron arrangement.The number of electrons in each energy level is written down, with commas used to separate the values, to represent the electron arrangement. Moving outward, we start at the first energy level that is closest to the nucleus.As we can see, the first energy level has two electrons, the second contains eight, and the third contains five.The electron arrangement would be 2, 8, 5.
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How would the following atoms bond? Match items from left to the right. Please help!! Actual answers only!!
The correct pairing of the elements based on the nature of chemical bonds formed is:
Na + F = NaFCa + O = CaOB + N = BNWhat are chemical bonds?Chemical bonds are bond which are formed between atoms of the same element or different elements by a transfer of a sharing of electrons.
There are two main types of chemical bonds:
Ionic or electrovalent bonds, andCovalent bondsIonic bonds results in the formation of oppositely-charged ions as electrons are transferred from one atom to another.
Example of ionic bonds are the chemical bonds formed between sodium and fluorine to form sodium fluoride, and the chemical bond formed between calcium and oxygen to form calcium oxide.
Covalent bonds are formed when atoms of the same or different elements share electrons between them.
Examples of covalent bonds are the chemical bonds formed between Boron and Nitrogen to form boron nitride.
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