How do scientists gather information about climate conditions millions of years ago?
Answer:
Paleoclimatology
Step by Step explanation:
is the study of climate records from hundreds to millions of years ago. Information for paleoclimate studies come from natural records rather than instruments: these indirect records of climatic conditions are called proxy records. Coring a tree to gain access to tree ring data.
If this block has a mass of 173.7 grams, then what is this element??
Answer:
C
I am pretty sure that is the answer
The mass of the given cube of 173.7g and the volume of the box is 9 cm³.Then the density is 19.3 g/cm³. Therefore, the element with this density is gold. Option D is correct.
What is density?Density of a substance is the ratio of mass to its volume. Thus it tells about how much denser the substance is in the given volume. This physical quantity is dependant on mass, volume temperature and pressure.
The element have their own density corresponding to the mass and volume used. The dimensions of the given box is 3, 3 and 1. Thus volume is the product of this length, breadth and height.
Volume = 3 ×3 × 1
= 9 cm³.
Mass of the box is given 173.7 grams. Now, the density of the element is calculated as follows:
Density = 173.3 / 9 cm³
= 19.3 g/cm³.
From the table, it is clear that the this density corresponds to the element gold. Therefore, option D is correct.
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(05.06 MC)
During an experiment, the percent yield of calcium chloride from a reaction was 85.22%. Theoretically, the
expected amount should have
grams What was the actual yield from this reaction? (5 points)
CaCO3 + HCI - CaCl2 + CO2 + H20
been 113
96.3 grams
О 99.0 grams
113 grams
0 121 grams
Answer:
96.3g is the actual yield from this reaction
Explanation:
Have been 113g...
The percent yield of a reaction is defined as one hundred times the ratio between actual yield (Our incognite) and the theoretical yielf (113g). The equation is:
Percent yield = 85.22% = Actual Yield / 113g * 100
0.8522 = Actual Yield / 113g
0.8522*113g =
96.3g is the actual yield from this reaction
Answer:
96.3
Explanation:
Just took the test
The volume of a gas is 2250 mL at 290 kPa what will the volume be when the pressure is reduced to .9 atm
Answer:
7178.22 mL
Explanation:
Applying,
PV = P'V'................. Equation 1
Where P = Initial pressureof gas, V = Initial volume of gas, P' = Final pressure of gas, V' = Final volume of gas.
make V' the subject of the equation
V' = PV/P'.............. Equation 2
From the question,
Given: V = 2250 mL, P = 290 kPa, P' = 0.9 atm = (101×0.9) = 90.9 kPa
Substitute these values into equation 2
V' = (2250×290)/90.9
V' = 7178.22 mL
Why does air density decrease with increasing altitude within Earth's atmosphere?
Explanation:
As the altitude increases, the pressure and the density of the atmosphere decrease.
Which of the following statements is true for all eukarya?
Group of answer choices
A. their cells contain a nucleus.
B. their cells do not contain a nucleus.
C. their cells do not contain a nucleus and they have a different cell wall from bacteria.
D. their cell do not contain a nucleus and they have a similar cell wall when compared to bacteria.
Answer:
A. their cells contain a nucleus
Explanation:
hope it helps
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2.(05.05 LC)
A chef is serving a lunch special with 1 sandwich and 2 corn cobs per plate. If there are 5 sandwiches and 14 com cobs, what is the theoretical yield? (3 point
O 2 plates
4 plates
5 plates
O 7 plates
Answer: 5 plates
Explanation:
Because you have 5 sandwiches total
5 plates are the theoretical yield. Hence, option C is correct.
What is a theoretical yield?The theoretical yield is the maximum possible mass of a product that can be made in a chemical reaction.
The actual yield is the result obtained from the experiment while the theoretical yield is the result obtained from our calculations.
The actual yield of a chemical reaction rarely equals the theoretical yield because some of the amounts are lost during the process.
5 plates are the theoretical yield.
Hence, option C is correct.
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Question 2 of 10. What is Diffusion?
Answer:
diffusion: the movement of molecules in a solution from an area of
higher concentration to an area of lower concentration
Diffusion is the movement of particles from where there are more to where there are less. This movement occurs until particles are evenly spread out. While diffusion can be seen in all states of matter, it is most common in liquids and gases.
Which area of science is considered the central science?
chemistry
biology
physics
environmental science
Answer:
Chemistry
Explanation:
Chemistry is considered the central science.
Which area of science is considered the central science?Chemistry is sometimes called "the central science" because it's so important to other fields of science, like biology, geology, astronomy, physics, medicine, engineering, materials science, and many other areas of study.
Which branch of science is the most important?All the branches of science possess their own level of importance, However, physics deals with the fundamental workings of material reality which are central to all other branches of science.
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Which of the following is NOT a good way to manage stress?
eat a healthful diet.
get enough sleep.
get plenty of exercise.
spend most of the time alone.
2. Which systems receive a benefit from the nervous system?
Digestive
Respiratory
Skeletal
Muscular
Cardiovascular (circulatory)
Answer:
spending most of the time aloneSkeletonCI2+NaOH⇒NaCI+NaOCI+H20
is there a way to balance this?
3.) which organic compound has 4 carbon atoms with at least one triple bond?
O butyne
O butene
O butane
O pentyne
propose 3 solutions that address that sources of global warming
Answer:
The correct answer is - reduce carbon emission, decrease deforestation snd increase plantation, use renewable energy.
Explanation:
Global warming is the process that is caused by human activities to increase the temperature of the earth. It increases the heat of the climate of the earth that leads to a negative impact on the environment. Increasing the greenhouse gas emission leads to trapping heat and cause global warming.
The three major solutions are:
1. reduce carbon and greenhouse gases: The main cause of global warming is the emission of greenhouse gases and an increase in carbon in the atmosphere, so reduce these gas emissions by avoiding fossil fuels that release carbon.
2. reduce deforestation and increase the plantation: trees take carbon dioxide from the environment, So prevent them from cutting and planting new trees will help reducing carbon from the environment.
3. Using renewable energy will help them to not depend on fossil fuels or water waste that will help in reducing global warming.
what is love?
A)don't hurt me
B)don't hurt me
C)No more
Answer:
C
Explanation:
I think it is a ever lasting process of pain and happiness cause the ones that are closest to you can make it hurt most but they can also make your day So probably
Which of the following best describes Avogadro's number?*
A) An equation that can be used to calculate how many atoms are in one mole of
anything
B) A variable that represents the value of the atomic mass relative to one mole of an
element
C) A constant that states how many atoms/molecules are in one mole of anything
D)An expression in scientific notation that represents the average atomic mass of an
element
Answer:
C) A constant that states how many atoms/molecules are in one mole of anything
Explanation:
Avogadro's number like the name suggests is a constant that states how many atoms/molecules are in one mole of anything.
CH4+xO2=CO2+2H2O. Find x
Answer:
x = 2, [tex]CH_{4} + 2O_{2} = CO_{2} + 2H_{2}O\\[/tex]
Explanation:
This question is related to balancing chemical equations.
[tex]CH_{4} + xO_{2} = CO_{2} + 2H_{2}O\\[/tex]
- There must be the same amount of carbons (C), hydrogens (H), and oxygens (O) on each side of the equals sign.
- There is already 1 carbon and 4 hydrogens on each side of the equals sign. The big number in front of the chemical compound multiplies into the individual elements and can be multiplied by the subscripts to get the total number of each element.
- On the right side of the equation, there are 4 oxygens (O), and on the left side, there are 2. In order for there to be 4 oxygens (O) on the left side, there must be a 2 in front of [tex]O_{2}[/tex].
Therefore, x = 2.
[tex]CH_{4} + 2O_{2} = CO_{2} + 2H_{2}O\\[/tex]
Read the given equation:
Ca(OH)2 + 2HCl - CaCl2 + 2H20
Which of the following is true about the equation? (5 points)
HCI is the base and Ca(OH)2 is the salt.
HCI is the acid and Ca(OH)2 is the salt.
Ca(OH)2 is the acid and Cacl2 is the salt.
Ca(OH)2 is the base and CaCl2 is the salt.
Answer:
D.
HCl is acid
Ca(OH)2 is base
CaCl2 is salt
In the given chemical equation Ca(OH)2 is the base and CaCl2 is the salt, thus option D is correct.
What is chemical equation?A chemical equation is a symbolic representation of a chemical reaction that shows the products, reactants, and direction of the reaction.
An acid is any hydrogen-containing substance that is capable of donating a proton (hydrogen ion) to another substance.
A base is a chemical species that donates electrons, accepts protons, or releases hydroxide (OH-) ions in aqueous solution.
A salt, in chemistry, is defined as the product formed from the neutralisation reaction of acids and bases.
Therefore, in this chemical equation option D is true about the equation i.e
Ca(OH)2 is the base and CaCl2 is the salt.
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What quantity of energy would be necessary to boil water with a mass of
123 g that is at 100.00°C ?
Answer:
i think 554 I think
Explanation:
maybe ..
Please help me quick I have to get this right
the following question represents a
A)-weak acid
B)-strong acid
C)-weak base
D)-strong base
Answer:Any acid that dissociates 100% into ions is called a strong acid. If it does not dissociate 100%, it is a weak acid.
Explanation:acid. (d) Water can act as a Brønsted-Lowry base. ... (b) Give the conjugate acid of the following Brønsted-Lowry bases: ... 16.21 Label each of the following as being a strong base, a weak base, or a species with ... (C) NH Weak base, Netyt is a weak acid ... CHz Lo0H is stronger acid than Hys, so equilibrinus lies to right.
What is the main purpose of phloem tissue?
to carry food from the leaves to all the cells of the plant
to absorb water and minerals from the soil
to store extra food for the plant to use in the winter
to carry water and minerals from the roots to the lea
ASAP:
The estimated atomic mass of silicon could be Choose... amu because the Choose.. abundant isotope is Choose...
Answer:
The estimated atomic of silicon is 28.082 a.m.u.
Explanation:
The estimated atomic mass of silicon ([tex]M_{Si, est}[/tex]), in a.m.u., is equal to the weighted average of atomic masses of silicon available in nature and in terms of their abundances:
[tex]M_{Si, est} = r_{1}\cdot M_{Si-28} + r_{2} \cdot M_{Si-29} + r_{3}\cdot M_{Si-30}[/tex] (1)
Where:
[tex]r_{1}[/tex], [tex]r_{2}[/tex], [tex]r_{3}[/tex] - Relative abundance of each isotope, no unit.
[tex]M_{Si-28}[/tex], [tex]M_{Si-29}[/tex], [tex]M_{Si-30}[/tex] - Atomic mass of each isotope, in a.m.u.
If we know that [tex]M_{Si-28} = 27.976\,a.m.u.[/tex], [tex]M_{Si-29} = 28.976\,a.m.u.[/tex], [tex]M_{Si-30} = 29.974\,a.m.u.[/tex], [tex]r_{1} = \frac{92.22}{100}[/tex], [tex]r_{2} = \frac{4.68}{100}[/tex] and [tex]r_{3} = \frac{3.09}{100}[/tex], then the estimated atomic mass of silicon is:
[tex]M_{Si, est} = r_{1}\cdot M_{Si-28} + r_{2} \cdot M_{Si-29} + r_{3}\cdot M_{Si-30}[/tex]
[tex]M_{Si,est} = \left(\frac{92.22}{100} \right)\cdot (27.976\,a.m.u.) + \left(\frac{4.68}{100} \right)\cdot (28.976\,a.m.u.) + \left(\frac{3.09}{100} \right)\cdot (29.974\,a.m.u.)[/tex]
[tex]M_{Si, est} = 28.082\,a.m.u.[/tex]
The estimated atomic of silicon is 28.082 a.m.u.
Compare the purple and orange arrows. Does more energy go into breaking bonds, or is more energy released when new bonds form?
Answer:
The breaking of chemical bonds never releases energy to the external environment. Energy is only released when chemical bonds are formed. In general, a chemical reaction involves two steps: 1) the original chemical bonds between the atoms are broken, and 2) new bonds are formed. These two steps are sometimes lumped into one event for simplicity, but they are really two separate events. For instance, when you burn methane (natural gas) in your stove, the methane is reacting with oxygen to form carbon dioxide and water. Chemists often write this as:
CH4 + 2 O2 → CO2 + 2 H2O + energy
Explanation:
here is the answer
Silver nitrate is reacted with magnesium bromide and two products are formed.
(Ignore selected answer)
Answer:
The correct answer is :
a silver nitrate solution (AgNO3) is mixed with a solution of magnesium bromide (MgBr2). The balanced reaction would be: 2 AgNO3(aq) + MgBr2 --> 2 AgBr + Mg(NO3)2
the last one
two advantage of tourist industry?
Explanation:
Two advantage of Tourist Industry:
Tourism is one of the largest and fastest growing industry in terms of generating more revenues, providing Large number of employment opportunities and only one major ways to development the nation within short spam of time. There are so many facts that, tourism helps making the country renowned all over the world and is called only one weapon to make country strong as from all the aspects.
Although, as we all know that, there are several facts and data's which shows that tourism is only one largest industry throughout world that generated huge amounts of Money than others. So what are the advantages of tourism? Which can be pointed out as following :-
1. Tourism helps to generate more revenues in the country.
2. The tourism can change the nation within a short time period.
3. Tourism helps to provide more numerous kinds of human resources in the nation.
4. Tourism is only one way to develop and to make renowned in the world
which is following is used to cook food?
Answer: A process of cooking food in a pot made from unglazed and natural clay. coddling: Heating food in water kept just below the boiling point.
Explanation:
Write a hypothesis using IF-THEN - BECAUSE of statement. (PLEASE HELP)
Ahmed is curious about the death of the fishes in the ocean. He knows from his environmental chemistry class that pollutants like heavy metals can cause the rapid death of marine organisms. So, Ahmed did an experiment and obtained water samples. He tested that water contains a high amount of lead and chromium.
Water is an essential part of life and its availability is important for all living creatures. On the other side, the world is suffering from a major problem of drinking water. There are several gases, microorganisms and other toxins (chemicals and heavy metals) added into water during rain, flowing water, etc. which is responsible for water pollution. This review article describes various applications of nanomaterial in removing different types of impurities from polluted water. There are various kinds of nanomaterials, which carried huge potential to treat polluted water (containing metal toxin substance, different organic and inorganic impurities) very effectively due to their unique properties like greater surface area, able to work at low concentration, etc. The nanostructured catalytic membranes, nanosorbents and nanophotocatalyst based approaches to remove pollutants from wastewater are eco-friendly and efficient, but they require more energy, more investment in order to purify the wastewater. There are many challenges and issues of wastewater treatment. Some precautions are also required to keep away from ecological and health issues. New modern equipment for wastewater treatment should be flexible, low cost and efficient for the commercialization purpose.
how to sold equation with periodic table of elements?
Answer:
6w6288shbdmdkdhckcncjciicjcididjdn dmxixisk ddjdidjjd
Explanation:
dnnxjxkxjxjndnfncjcshndnsbsnnsnssbsnsnsnsndndndnx
Can someone please help me on this
Answer:
it's none because the graph is decreasing like a milf so that why
Which half-reaction shows conservation of charge? * 5 points A) Cu + e– → Cu+ B) Cu2+ + 2e– → Cu C) Cu+ → Cu + e– D) Cu2+ → Cu + 2e–
Answer:
B) Cu2+ + 2e– → Cu.
Explanation:
Hello there!
In this case, in the regard of redox reactions, we must keep in mind that half-reactions show us how the flow of electrons when an element undergoes a change in its oxidation state, say increasing or decreasing. In such a way, if the element is oxidized, increase the oxidation state, we add electrons on the right side and the contrary if the element is reduced, decrease the oxidation state.
In such a way, we can see that the reaction B) Cu2+ + 2e– → Cu, shows how the Cu2+ cations are reduced by adding electrons to produce Cu and thus, conserve the charge.
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NaOH+ N2O3---> ___+____
Answer:
NaOH+ N2O3---> NaNO2 + H2O