Answer:
There are several theories to the extinction of the dinosaurs. One of the most supported ones are the impact of a meteor near Mexico that caused ashes to enter the atmosphere. These ashes led to a decrease in global temperature since it prevented sunlight from entering. There are many different minor theories that aren't as backed up as the meteor one.
About 65.5 million years ago was the start of the end of the age of the dinosaur. We know now that there was a meteor strike that happened 65.5 million years ago in Latin America and most scientists believe that or that plus a few other things is was initiated the collapse of the age of the dinosaur and initiated the rise of mammals which then leads to us. So 65.5 million years ago, there was an extinction event which scientists believe it was a meteor.
It most likely didn't kill all the dinosaurs immediately. It most likely altered the atmosphere and possibly caused a couple thousand years of a nuclear winter where the sun was blocked out if you can imagine that in your head.
The meteor was about 6 miles wide which doesn't sound like a lot to cause a mass extinction like this but it happened. So that large object striking the earth caused this havoc.
We know when this happened and where it happened.
Years ago, geologists started to notice that there was a thin layer almost like a layer of icing that existed in the same age all over the earth. Now, there is an element called iridium and it doesn't exist on earth. It only exists in outer space and so it had to be brought here and the thought is that this meteor mainly added this element and when it hit, it dispersed and it left this layer all over our planet so it's almost a fingerprint. So we know that this layer exists at 65 million years everywhere on earth and that's associated with this meteor.
The meteor hit in Latin America. The Gulf of Mexico is a meteor crater and that's where it hit and it hit about half on land and half in water.
If that didn't happen, there is a highly likelihood that dinosaurs would still be here. There is no reason why they wouldn't be and they would have evolved in any way they could have evolved in 65 million years and would still be here. However, mammals wouldn't be here.
Fill in the coefficients that will balance the following reaction:
a0Ca + a1CO2 + a2O2 → a3CaCO3
Answer:
Explanation:
aCa + bCO₂ + cO₂ → dCaCO₃
Chemical reactions obey the law of conservation of matter. The law states that "matter is neither created nor destroyed in the course of a chemical reaction". From this, we can deduce that the total mass of the products and reactants are equal.
To balance a chemical reaction, we can do so by inspecting the atoms/compounds involved and putting the appropriate coefficients at the back of the reactants and products. For equations in which inspection might not easily work, we can use a mathematical approach.
By inspecting the reaction above, we can easily balance it
Using the mathematical approach:
The coefficients are a,b,c and d. They are needed to conserve the atoms. So:
For Conservation of Ca: a = d (i)
C: b = d (ii)
O: 2b + 2c = 3d (iii)
if we assume that a = 1, then d = 1
b = 1
from (iii): 2c = 3d -2b
2c = 3- (2 X 1)
2c = 1
c = [tex]\frac{1}{2}[/tex]
Therefore we have a = 1
c = [tex]\frac{1}{2}[/tex]
b = 1
d = 1
aCa + bCO₂ + cO₂ → dCaCO₃
Ca + CO₂ + [tex]\frac{1}{2}[/tex]O₂ → CaCO₃
Select the correct answer.
What does the kinetic theory state about the relationship between the speed and temperature of gas molecules?
A.As the temperature increases, the speed of gas molecules remains constant.
B.As the temperature increases, the speed of gas molecules decreases.
C.As the temperature increases, the speed of gas molecules increases.
D. As the speed of gas molecules increases, the temperature becomes constant
E.As the temperature decreases, the speed of gas molecules increases.
Answer:
C. As the temperature increases, the speed of gas molecules increases
Answer:
C. As the temperature increases, the speed of gas molecules increases.
Explanation:
Kinetic Molecular Theory states that gas particles are in constant motion and exhibit perfectly elastic collisions. Kinetic Molecular Theory can be used to explain both Charles’ and Boyle’s Laws. The average kinetic energy of a collection of gas particles is directly proportional to absolute temperature only.The following are the basic assumptions of the Kinetic Molecular Theory:
The volume occupied by the individual particles of a gas is negligible compared to the volume of the gas itself. The particles of an ideal gas exert no attractive forces on each other or on their surroundings. Gas particles are in a constant state of random motion and move in straight lines until they collide with another body. The collisions exhibited by gas particles are completely elastic; when two molecules collide, total kinetic energy is conserved. The average kinetic energy of gas molecules is directly proportional to absolute temperature only; this implies that all molecular motion ceases if the temperature is reduced to absolute zero.So, the right choice is:
C. As the temperature increases, the speed of gas molecules increases.
Today's lunch is related to your overall diet in the same way that today's weather is related to ______________.
A. Precipitation
B. Climate
C. The atmosphere
D. The water cycle
Answer:
B . Climate
Explanation:
lunch is temporary to diet is long lasting so , weather is temporary and climate is long lasting
Today's weather is related to climate, where weather indicates the short-term atmospheric conditions and climate represents long-term patterns, similar to a single meal in relation to an overall diet.So,option B is correct.
Today's lunch is related to your overall diet in the same way that today's weather is related to climate. While the individual meal you eat today is a single occurrence that contributes to your dietary pattern over time, today's weather refers to the specific atmospheric conditions present at a given moment. In contrast, the climate refers to the long-term, predictable atmospheric conditions of a specific area. Weather can be considered the short-term variation, just like one meal is to an overall diet, while climate represents the long-term trends in weather patterns, similar to how a diet represents long-term nutritional habits.
Which is an intensive property of a substance?
Odensity
O volume
O length
O mass
Answer:
density
Explanation
as you increase the temperature of a solute it's solubility
3-ethyl-2-methyl-2-pentene
how is the oxidation state of a transition metal determined from the chemical formula ?
Answer:
Explanation:
In a chemical formula, the oxidation state of transition metals can be determined by establishing the relationships between the electrons gained and that which is lost by an atom.
We know that for compounds to be formed, atoms would either lose, gain or share electrons between one another.
The oxidation state is usually expressed using the oxidation number and it is a formal charge assigned to an atom which is present in a molecule or ion.
To ascertain the oxidation state, we have to comply with some rules:
The algebraic sum of all oxidation numbers of an atom in a neutral compound is zero. The algebraic sum of all the oxidation numbers of all atoms in an ion containing more than one kind of atom is equal to the charge on the ion.For example, let us find the oxidation state of Cr in Cr₂O₇²⁻
This would be: 2x + 7(-2) = -2
x = +6
We see that the oxidation number of Cr, a transition metal in the given ion is +6.
Answer: it's total charge of something I already forgot
Explanation: finished quiz don't listen to Einstein above me why do u think he got little votes and likes
2 Points
What kind of bond would many atoms of the same metal make?
Answer:
A metallic bond
Explanation:
Determine which law is appropriate for solving the following problem. What volume will 1.56 liters of a gas at 27°C and 745 mmHg of pressure occupy at 100°C and 700 mmHg of pressure? Law used:
Answer:
We use the general gas law or the combined gas law to solve this kind of problem
Explanation:
The general gas law is a combination of both Boyle's law and Charle's law. It is expressed as:
[tex]\frac{ P₁V₁}{T₁}[/tex] = [tex]\frac{ P₂V₂}{T₂}[/tex]
The unkown is V₂ which can be derived by substituting in the equation above.
The general gas law assumes that, n, the number of mole is 1
Answer: To determine the final Volumen of the gas we use the Combined gas law
Explanation:
The combined gas law combines three gas laws: Boyle's Law, Charles' Law, and Gay-Lussac's Law, this law links pressure, volume, and temperature of a giving gas, from initial conditions ( expressed with the number 1) to final conditions (expressed with the number 2)
P1V1 / T1 = P2V2 / T2
In our exercise, we state the initial conditions of the gas, ( keep in mind that this law works only with absolute temperatures, then we need to convert degrees Celsius to the Kelvin scale)P1 = 745 mm Hg
V1 = 1,56 L
T1 = 27°C + 273,17K = 300.15 K
Now we state the final conditions and the parameter we need to calculateP2 = 700 mm Hg
V2 = x (the unknown you're solving for)
T2 = 100°C + 273,15K = 373.15 K
Finally, we take the formula and we isolate the V2 that we are interested in and fill in the rest with the information giving.V2 = (P1 V1 T2) / (P2 T1)
V2= (745 mm Hg . 1,56 L . 373.15 K) / ( 700 mm Hg . 300.15 K )
V2 = 2,06 L
Which of the following is an example of an environmental problem caused by chemicals
Answer:
A
Explanation:
All of the other options are ways that could help the environment from the chemicals, but if they just continue to use the chemicals then it would hurt the environment
Final answer:
Environmental problems caused by chemicals often involve contamination of ecosystems and food supplies, with substances like DDT and PCBs serving as examples of harmful environmental alterations.
Explanation:
An environmental problem caused by chemicals can manifest in various forms, including contamination of ecosystems and food supplies with harmful chemical agents. For example, chemicals such as DDT and its breakdown product DDE, or industrial chemicals like polychlorinated biphenyl (PCB), have contaminated food sources and adversely affected the environment. Persistent organic pollutants, introduced into the environment without a natural occurrence or in unnatural ratios, are known to cause environmental alterations, with their full scale of effects being difficult to calculate. This kind of problem highlights the significant role of chemists and chemical engineers in addressing the challenges posed by these substances, fostering environmentally beneficial chemistry and responsible manufacturing practices.
Which of these is an example of a chemical change?
Deflating a rubber balloon
Combining rubber with sulfur
Stretching an elastic rubber band
Erasing pencil marks from a page
Answer: combining rubber with sulphur
Explanation:
Chemical change is the change in which chemical composition of the substance changes by rearrangement of atoms.
Physical change is a change in which only the physical properties such as size, shape etc change and there is no rearrangement of atoms.
1. Deflating a rubber balloon only decreases the size of balloon and hence is a physical change.
2. Combining rubber with sulphur is vulcanisation in which sulphur forms bonds with rubber and thus is a chemical change.
3. Stretching an elastic rubber band only changes the shape and hence is a physical change.
4. Erasing pencil marks from a page does not involve any rearrangement of atoms and thus is a physical change.
Which of the following statements are true about metallic bonds?
A. They hold together ionic bonds.
B. They bond a metal to a nonmetal.
C. They bond identical atoms together.
D. They hold together atoms with different electronegative.
Answer:
B. They bond identical atoms together
Explanation:
Metallic Bond: This is the bond that exists among the atoms of the metal. This is a type of electrostatic attraction between conduction electrons of metallic atom and their positively charged metal ions.
(figure attached)
Example:
Copper is a metallic element and its atoms consist of metallic bond among their selves.
Options A, B, D are not correct as all states for a kind of ionic bond formation.
Ionic bond:
It form by the complete transfer of electron from one atom to other
It is formed among two atoms of different electronegativities.
Also metals are electro-positive and non -metals are electro-negative so they form ionic bond.
Example is NaCl where sodium is a metal and Chloride is non-metal and they from ionic bond.
Answer:
C. They bond identical atoms together.
Explanation:
Which phrase best summarizes how animals get water from the environment
as part of the water cycle?
Answer: I believe the question being asked upon is the 5.2.5 Quiz: Interactions in Ecosystems, which the answer would be, by drinking and by eating other living things, or species.
Explanation: Animals rely on rivers, lakes, and streams for water, which is apart of over environment. Furthermore, animals contain nutrients and water. Therefore, the answer would be, by drinking and by eating other living things. As a student, I read the study, or text, the study goes more in depth regarding the answer to this question in pages 11-18. Have a good day, and make sure to study! ♡︎ P.s. Also added a picture!
Answer:Interactions in Ecosystems, which the answer would be, by drinking and by eating other living things, or species.
Explanation:
Isomers have different ______ formulas. molecular structural empirical chemical
Answer:
Structural
Explanation:
Isomerism is the existence of two or more compounds with the same molecular formula but different molecular structures due to the difference in the arrangement of atoms or spatial orientation of atoms.
Isomers have the same molecular formula but differs in their structural arrangement.
In organic chemistry, Isomerism can orginate from different arrangement of atoms.
It can be carbon chain length known as chain isomerism. Here, the carbon length is changed and arranged in different ways.
We can also have position isomerism which entails the position of the functional group in the structure.
It can also be functional group isomerism which deals with the possible arrangement of the group on the chain.
Isomers have the same molecular formulas but different structural formulas. This different structural arrangement leads to differences in the physical and chemical properties of the isomers.
Explanation:Isomers are molecules that have the same molecular formula, meaning the same number and type of atoms, but different arrangements of atoms within the molecule. Hence, isomers have different structural formulas, which are used to represent the three-dimensional arrangement of atoms in a molecule. For instance, the compounds butane and isobutane both have the formula C4H10, but in butane, all four carbon atoms are arranged in a row, while in isobutane, three carbon atoms form a branch off a central carbon atom. Therefore, the structural formulas of these compounds differ, even though the molecular formula is the same.
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If a 46 gram sample of a radioisotope, Lead - 189 has a half life of 20 days then how many grams of the sample will remain after 60 days?
Answer:
5.75 g.
Explanation:
It is known that the decay of isotopes of Pb-189 obeys first order kinetics. Also, it is clear that in first order decay the half-life time is independent of the initial concentration. The half life time of Pb-189 decay = 20 days.Thus, 60 hours represent (60/20) 3 half-lives.∴ 46 g →(first half-life) 23 g →(second half-life) 11.5 g →(third half-life) 5.75 g.
So, The amount remained is 5.75 g after 3 half-lives (60 days).
Use the standard enthalpies of formation for the reactants and products to solve for the ΔHrxn for the following reaction
Ca(s)+ 2H20(l) → Ca(OH)2(s)+H2(g)
∆Hrxn=
The reaction is =
Answer:
- 386.6 kJ/mol.
Explanation:
To solve this problem, we can use Hess's Law:ΔHrxn = ΣΔHf(products) - ΣΔHf(reactants)
For this reaction: Ca(s)+ 2H₂O(l) → Ca(OH)₂(s) + H₂(g),
∴ ΔHrxn = ΣΔHf(products) - ΣΔHf(reactants) = [ΔHf(Ca(OH)₂(s)) + ΔHf(H₂)(g)] - [ΔHf(Ca)(s) + 2*ΔHf(H₂O)(l)].
knowing that:ΔHf(Ca(OH)₂(s)) = - 985.2 kJ/mol, ΔHf(H₂)(g) = 0.0 kJ/mol, ΔHf(Ca)(s) = 0.0 kJ/mol, ΔHf(H₂O)(l) = - 285.8 kJ/mol.
∴ ΔHrxn = ΣΔHf(products) - ΣΔHf(reactants) = [ΔHf(Ca(OH)₂(s)) + ΔHf(H₂)(g)] - [ΔHf(Ca)(s) + 2*ΔHf(H₂O)(l)] = [(- 985.2 kJ/mol) + (0.0 kJ/mol)] - [(0.0 kJ/mol) + 2*(- 285.8 kJ/mol)] = - 386.6 kJ/mol.
what biome has many nocturnal animals that burrow underground during the day that are active at night
Nocturnal animals that burrow underground during the day and are active at night are found in the desert biome.
Explanation:The biome that has many nocturnal animals that burrow underground during the day and are active at night is the desert biome. In the desert, animals like rodents, reptiles (such as lizards and snakes), and insects have adapted to the extreme temperatures by being active during the cooler nights and seeking shelter from the sun during the day. Examples of nocturnal animals in the desert biome include kangaroo rats, fennec foxes, and scorpions.
Final answer:
The desert biome is characterized by nocturnal animals that burrow during the day to avoid heat and are active at night when temperatures drop.
Explanation:
The biome that you're referring to, where many nocturnal animals burrow underground during the day and are active at night, is likely the desert biome. Nocturnal animals, such as bats, foxes, and coyotes, are active at night partly because the temperature is cooler and more manageable, which is particularly important in the hot desert environment. These animals have adapted to their warm habitats by being active during the cooler nocturnal hours to conserve water and energy. Additionally, nocturnality may help them avoid predators and take advantage of the nighttime ecology, such as different prey species that are also active at night.
If an object moves faster and faster, what must change?
the thing that must change Speed
Answer:
The Speed of the object must change in order to keep moving or stop moving so your answer would be A. Only its speed
Explanation:
f a hypothesis can stand the test of repeated examination, it can become a _____.
theory
Answer: Accepted Theory
Explanation: A scientific theory is an explanation of an aspect of the natural world that can be repeatedly tested and verified in accordance with the scientific method, using accepted protocols of observation, measurement, and evaluation of results. Where possible, theories are tested under controlled conditions in an experiment.
How many grams of hydrogen are necessary to react with 2.85 mol CO
CO+2 H2=CH3OH
2.85 mol Co x (2mol H2/1 mol Co)=5.70 mol just concert to grams
5.70 mol H2 x (2 g H2/1 mol H2) =11.40 grams of H2
To react with 2.85 moles of CO, 11.4912 grams of hydrogen gas (H₂) are necessary based on the balanced equation 2 H₂ + CO → CH₃OH.
Explanation:To determine how many grams of hydrogen are necessary to react with 2.85 mol of CO, we need to refer to the balanced chemical reaction equation that hydrogen and CO might participate in. One such reaction is the synthesis of methanol:
2 H₂ + CO → CH₃OH
According to this equation, 2 moles of hydrogen gas (H₂) react with 1 mole of carbon monoxide (CO) to produce methanol (CH₃OH). Therefore, to react with 2.85 moles of CO, we would need 5.70 moles of hydrogen gas (2 x 2.85 moles of CO). To convert moles of hydrogen to grams, we multiply by the molar mass of hydrogen (approximately 2.016 g/mol for H₂).
5.70 moles H₂ x 2.016 g/mol = 11.4912 g of H₂
Thus, 11.4912 grams of hydrogen are necessary to react with 2.85 moles of CO.
the three factors that determine the characteristics of a solution are
Answer:
Instrinsic Solubility, Temperature, and Sample Size.
There are four time zones in the continental United States.
True
False
Answer:
True
Explanation:
There are four time zones in the continental United States: Eastern, Central, Mountain and Pacific.
There are four time zones in the continental United States. Hence, option A is correct.
What is continental?A continent is a large continuous mass of land conventionally regarded as a collective region.
There are actually six time zones in the USA.
The four main ones are Eastern, Central, Mountain, and Pacific Standard Time.
Hence, option A is correct.
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What is the scientific notation of 696,000?
Hello There!
Your answer is In Image Provided.
What is the molarity of a solution made by mixing 3.50 g of potassium chromate in enough water to make 100.00 ml of this solution?
Answer:
.18 M
Explanation:
1st
The molarity of an aqueous solution (a solution that has water as the solvent) can be found just by remember this one formula = [tex]\frac{mol}{liters}[/tex].
[moles of solute / volume of solution in L]
So, what do we have? From a glance we have the number of solute (Potassium Chromate), that tells us that we need to convert that value that is in grams (g) into...Moles or (mol), we can do that like this
[tex]\frac{3.50 g}{ } \frac{1 mol}{194.19 g}[/tex]
After we cross multiply 3.50 times 1 and then divide by 194.19 - we get this value ⇒ .018 mol (the g cancels, and we keep mol)
(We get the 194.19 from adding up the molecular weight of Potassium Chromate, which is about 194.19 g/mol. In the above equation though, we flipped this, so that 1 mol is in the numerator and the 194.19 is in the denominator; this helps us convert the 3.50 g to moles).
2nd
Now, we just have to remember that 1 liter = 1000 ml. Because its easier for us to use a L instead of "ml" in the molarity formula. So...
100.00 ml = .1 L ....
(because [tex]\frac{100 ml}{ } \frac{1 L}{1000 ml} = .1L[/tex]
Finally, we just add our (.018 mol and .1 L) into one nice equation (plug the numbers we converted to back in)
[tex]\frac{.018 mol}{.1L} = .18 M[/tex]
Is it clear now?
Classify each property as intensive or extensive. Color, temperature, volume, hardness, mass, boiling point, length, density
Answer:
Intensive properties can be used to help identify a sample because these characteristics do not depend on the amount of sample, nor do they change according to conditions.
Explanation:
Intensive properties are bulk properties, which means they do not depend on the amount of matter that is present. Examples of intensive properties include:
Boiling Point
Density
State of Matter
Color
Melting Point
Odor
Temperature
Refractive Index
Luster
Hardness
Ductility
Malleability
Explanation:
When amount of matter changes in a substance then a physical property that does not change due to this is known as an intensive property.
For example, density, color, boiling point, hardness etc are all intensive properties.
Whereas property of a substance that changes due to change in amount of matter of a substance is known as extensive property.
For example, temperature, volume etc are all extensive properties.
Hence, we can conclude that given properties are classifies as follows.
Intensive property : color, hardness, boiling point, density, temperature.
Extensive property : length, volume, mass.
40 POINTS.will give brainliest happily if helped ASAP
1.
Which of the following muscles are attached to a bone?
Bladder muscles
Cardiac muscles
Skeletal muscles
Stomach muscles
2.
What is the main function of the endocrine system?
To control body activities through the release of chemicals
To help in body movements and maintaining posture
To produce new individuals through fertilization
To exchange gases like oxygen across the body
3.
Which of the following microorganisms is most likely to get its main source of nutrition from a host?
Bacteria
Parasite
T-cell
Virus
Answer:
1 is Cardiac muscles
2 is To control body activities through the release of chemicals
3 is Bacteria
Explanation:
Answer:
1. Skeletal Muscles
2. To control body activities through the release of chemicals
3. Parasite
Which statement about astrology is not true? the positions of the planets at the time of birth have influence on a persons life
Answer:
The positions of the planets at the time of birth have influence on a person's life
What is data that is not directly collected or observed by the scientist called?
.
A. Research data
B. Adjunct data
C. Secondary data
D. Derivative data
Answer: C. Secondary data
Explanation:
It means that the data that was collected by someone else that is not the scientist, it may include censuses, surveys, data bases or other sort of information. Such data could be collected by different private companies, from organizational records to government departments, as they often collect data for other research purposes and the information is available to be used for other scientific purposes.
A data that is not directly collected or observed by the scientist is called: C. Secondary data.
What is data?Data can be defined as a representation of instructions or factual information in a formalized manner, especially as a series of binary digits (bits) or samples that are used by scientist in an experiment or research.
Generally, there are two (2) main types of data and these include:
Primary dataSecondary dataIn Science, a secondary data refers to a type of data that isn't directly collected or observed by the scientist but from a primary source.
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Which describes energy changes during nuclear fission?
PLEASE EXPLAIN HOW YOU GOT YOUR ANSWER!!!!
A very large amount of energy is produced from a tremendous mass.
A very large amount of energy is produced from a series of chemical reactions.
A very large amount of energy is produced from a very small mass.
Answer:
A very large amount of energy is produced from a very small mass
Explanation:
Nuclear energy is produced either by fusion or fission. The former is the fusion of lighter atoms into heavier elements while the latter is the splitting of a heavier atom into lighter atoms. Both produce tremendous amounts of energy. Fusion, causes compaction of mass while fission reduces it. Fusion does not produce radioactive particles while fission does (alpha and beta particles and neutrons).
Energy changes during nuclear fission involve the conversion of a very small amount of mass into a large amount of energy, much more than is produced in chemical reactions like burning coal.
Nuclear fission is a process where the nucleus of an atom, typically a heavy element like uranium-235, is split into smaller, lighter nuclei. The correct description of energy changes during nuclear fission is: a very large amount of energy is produced from a very small mass. This is due to the relationship between mass and energy as described by Einstein's mass-energy equivalence formula, E=mc2. When a mole of uranium-235 undergoes fission, there is a small decrease in the total mass of the products compared to the original mass (about 0.2 grams). According to the formula, this 'lost' mass is converted into a vast amount of energy, approximately 1.8 × 1010 kJ per mole. This energy release in nuclear fission reactions far exceeds the energy produced in chemical reactions, such as the burning of coal.
Can some one help me with science . I am having a difficult time .
Kilometer - km - 1,000
Hectameter - hm - 100
Decameter - dam - 10
Millimeter - mm - 0.001
The table provides clear prefix rules.
The prefixes can be used for most (if not all) units such as grams (kg,mg...).
Hello there i hope you are having a good day :) Answer :
Prefix with the base unit meter : Symbol : Number of meters :
. (kilometre) (Km) = 1000 m
. (Hectometre) (HM) = 100 m
. (Decameter) (Dam) = 10 meters
. (Millimetre) (mm) = 0.001 meters
Hopefully this help you :)