Answer:
B
Explanation:
The sun can be dangerous but it also helps our Earth in a lot of ways
Final answer:
Answer C is true: The sun is critical for life on Earth, affecting natural cycles and providing necessary energy, but its UV rays can also be harmful to health and influence Earth's climate.
Explanation:
The correct answer is C: The sun is very important, but its rays can also be harmful. The sun radiates light and heat which are essential for the existence of life on Earth. It plays a crucial role in various natural cycles, such as those that regulate climate and weather, and it has enabled the development of all life forms as we know them. However, it is also true that the sun can be dangerous due to its intense ultraviolet (UV) rays, which can cause skin cancer, cataracts, and other health issues. Moreover, changes in the sun's energy can influence Earth's climate, potentially leading to warming or cooling periods.
once formed how do fossils get back to the surface for us to find them?
Answer:
Explanation:
After fossils are buried, how do they get to the surface to be discovered? That's right, the only way for those sediments to reach the surface is for them to be pushed up during the process of mountain making and then worn away by the forces of erosion.
Fossils form in sedimentary layers or rock layers from specific periods when favorable conditions permit preservation of bones, teeth, and sometimes impressions of the organism. Geological activities, such as erosion and plate tectonics, along with climate change, can eventually bring these fossils back to the surface.
Explanation:Fossils, which provide solid evidence of organisms from the past, are typically found in sedimentary layers located next to bodies of water or in rock layers dating back to periods such as the Permian period. Upon death, an organism's body decomposes, leaving mostly teeth and bones, which under specific conditions can become fossilized through processes involving materials like volcanic ash, limestone, and mineralized groundwater.
Geological activity, such as erosion, weathering surface layers, and plate tectonics can eventually bring these fossils back to the surface. Climate change can also expose fossils, as seen when perennial snow covering Greenland melted to reveal geologic evidence of ancient life. These methods allow us to discover fossils of organisms ranging from bivalves and trilobites to early vertebrate bones.
The study and categorization of these fossils from all over the world allows scientists to determine when these organisms lived relative to each other, creating a fossil record that narrates the story of life's evolution on our planet.
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Which is a process that causes an organism’s poorly suited characteristics to disappear?
death rate
adaptation
natural selection
An iron nail (Fe) is placed into a solution of copper(II) sulfate (CuSO4). After some time, the blue color of the copper(II) sulfate disappears and some copper-colored solid (Cu) is found on the surface of the nail. The solution now contains iron(II) sulfate (FeSO4 ), and the container feels warmer than before the reaction.
1. What do the color changes indicate?
2. List the reactants
3. List the products.
4. Explain what is meant by a balanced chemical equation.
5. How can you determine the rate of a chemical reaction?
Answer:
1. The colors changes mean the reaction took place.
2. Fe and CuSO4
3. FeSO4 and Cu
4. This means that the electrons on both the reactants and the products have to be balance or need to be the same.
5. When you get the products meaning after the reaction takes place
The color change from blue to colorless indicates copper ions are being reduced to metallic copper in a chemical reaction, where iron and copper(II) sulfate are reactants, and iron(II) sulfate and copper are products. A balanced chemical equation has equal numbers of each type of atom on both sides, and reaction rate can be measured by changes in reactant/product concentration over time.
The color changes indicate a chemical reaction is taking place. Specifically, the disappearance of the blue color suggests the reduction of copper ions (Cu2+) to metallic copper (Cu) and their removal from the solution.
The reactants in this reaction are iron (Fe) and copper(II) sulfate (CuSO4).
The products are iron(II) sulfate (FeSO4) and copper (Cu).
A balanced chemical equation means that the number of atoms for each element is the same on both sides of the equation. This follows the law of conservation of mass, which states that matter cannot be created or destroyed in a chemical reaction.
To determine the rate of a chemical reaction, one approach is to measure the change in concentration of a reactant or product over time. For example, for the reaction Fe(s) + CuSO4(aq) → FeSO4(aq) + Cu(s), you might measure how quickly the blue color of CuSO4 fades or how quickly metallic copper forms on the iron nail.
How many moles of NO gas are formed from 2.25 moles of nitrogen?
Hey there!
A mole is measured in atoms, molecules, particles. It's kind of a loose sort of measurement, just unit of the substance.
Since there is a ratio of 1 to 1 nitrogen to oxygen, there will be the same amount of molecules as atoms of nitrogen.
2.25 moles of NO gas are formed from 2.25 moles of nitrogen.
Hope this helps!
Define: 1. acids, 2. strong acids, 3. weak acids.
Final answer:
An acid is a compound that releases hydrogen ions in water. Strong acids fully ionize, releasing all their hydrogen ions, whereas weak acids only partially ionize. Examples are hydrochloric acid (strong) and acetic acid (weak).
Explanation:
Definitions of Acids, Strong Acids, and Weak Acids:
Acids can be described as molecular compounds that release hydrogen ions (H+) when dissolved in water, which are responsible for the characteristic properties of acids in aqueous solutions. These properties include the ability of the solution to conduct electricity, due to the presence of ions.
Strong acids are those that completely ionize in solution, releasing all of their hydrogen ions into the water. An example of a strong acid is hydrochloric acid (HCl), which dissociates into hydrogen and chloride ions as follows:
HCl → H+ + Cl¯
On the other hand, weak acids only partially ionize in water, which means not all of their hydrogen ions are released into the solution. Acetic acid, found in vinegar, is a common example of a weak acid. Its ionization is represented by the following chemical equation:
CH3COOH → CH3COO¯ + H+
The strength of an acid can be quantitatively represented by its acid ionization constant (Ka), which is higher for strong acids and lower for weak acids.
Ben and Sam were conducting experiments on physical and chemical changes in science class. First they added some salt to water and stirred it up until the salt dissolved. "That's a physical change" Ben said. "And that's a solution which is a mixture", added Sam. Next they added an anti-acid tablet to some water. The water began to fizz and bubble. The beaker got cooler. "That's a physical change too," Ben noted. "No, it's not," responded Sam. Who is correct and where should the contents of the beaker be placed in the Venn diagram?
A) Sam is correct. It is not a physical change and it should be placed in A
B) Sam is correct. It is a chemical change and the contents should be in D. for compound.
C) Ben is correct. It is a physical change and it is a solution, placing it in B. as a mixture.
D) They are both correct. It is a mixture and a compound and the contents should be placed in C.
Answer:
b
Explanation:
hi from 2022
Ben and Sam were conducting experiments on physical and chemical changes in science class. Sam is correct. It is a chemical change and the contents should be in D. for compound. Therefore, option B is correct.
What is meant by chemical and physical change ?In a physical change the visual aspect or form of the matter changes but the kind of matter in the substance does not. However, in a chemical change, the kind of matter changes and at least one new matter with new properties is produced.
Some of the processes that makes physical changes include cutting, bending, dissolving, freezing, boiling, and melting.
Examples of chemical changes are baking soda and vinegar creating carbon dioxide, iron rusting, and wood burning.
Thus, Sam is correct. It is a chemical change and the contents should be in D. for compound, option B is correct.
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Where and why does Celiac Disease Occur?
Answer:
Celiac disease occurs in the intestines as an allergic response to Gluten in certain cereal grains.
Explanation:
Answer:
Celiac disease is genetic and if one person of the family has it you might have it too. Also if one of the parents have a certain gene and is passed on to the child the risk of celiac disease is high.
Explanation:
Hope it Helps
4. The type of society that has the greatest energy needs is the __
A hunting society
B agricultural society
C industrial society
D gathering society
In the past all living things were classified as
Answer:
Modern scientists base their classifications mainly on molecular similarities. They group together organisms that have similar proteins and DNA. Molecular similarities show that organisms are related. In other words, they are descendants of a common ancestor in the past.
Explanation:
What is the total number of Joules of heat absorbed by 65.0 grams of water when the temperature of the water is raised from 25°C to 40°C?
To find the total heat absorbed by 65.0 grams of water when its temperature increases from 25°C to 40°C, use the formula: Q = mcΔT.
Explanation:The total number of Joules of heat absorbed by 65.0 grams of water can be calculated using the formula:
Q = mcΔT, where m is the mass of water, c is the specific heat capacity of water, and ΔT is the temperature change.
In this case, you can use the specific heat capacity of water (4.184 J/g°C) to find the heat absorbed.
SC.7.L.17.2
1. Eagles are predators, meaning they hunt animals for food. Vultures are scavengers, meaning they eat they
remains of animals. Which of the following statements correctly describes how predators and scavengers affect
their environments?
a. Both scavengers and predators remove energy from the environment.
b. Both scavengers and predators transfer energy within the environment. *
C. Scavengers transfer energy, while predators remove energy from the environment.
d. Predators gain energy from their prey, and scavengers lose energy lose energy by feeding on remains.
Answer:
B
Explanation:
Answer:
B
Explanation:
Many of the stars we see in the night sky are called blue giants. They put out more energy and burn millions of times brighter than the Sun. Why does the Sun appear much larger and brighter from Earth than blue giant stars?
Answer:
Because it is closer to earth than the other blue giant stars.
Explanation:
The sun is closer to earth than any other big star which means we see it bigger.
Choose the words that make each statement true.
A6.0 M solution contains 6.0
of solute
dissolved in one of solution. The Min
6.0 M refers to
. The
concentration of a 6.0 M solution may also be
expressed as
Answer:
moles, liter, concentration, and 6.0 mol/L
Explanation:
Answer:
First Question:
Moles, liter, concentration, 6.0 mol/L
Second Question:
C. [HCl]
Third Question:
C. molarity.
Fourth Question:
A. M = mol solute/liter solution
Explanation:
Got it right
Balance this chemical equation please
Answer:
CH4 + 2O2 (excess) → CO2 + 2H2O + EnergyExplanation:
Combustion of methane gas molecules in abundance of O2 can follow the above reaction, product expected carbon dioxide, water and energy only.
But, when the O2 is not sufficiently available for perfect methane combustion, then there are many other products from the methane combustion reaction in above the product with CO and C.
The molar ratio of [C]: [CO] :[CO2] will depend on the availability of O2 for combustion of methane . In the high deficiency of oxygen conditions: monoxide and black carbon will be the major products of the combustion of methane.
Water vapor condenses into a glass of water. The water is then placed in a freezer and changes into ice. What remains consistent as the water changes states? (A) its chemical properties (B) its physical properties (C) its appearance (D) its temperature
Water's chemical properties remain the same as it changes states from vapor to liquid to ice because it retains its molecular structure of two hydrogen atoms bonded to an oxygen atom (H₂O) throughout the transformations.
Explanation:As water changes states from water vapor to liquid water, and then to ice, what remains consistent is (A) its chemical properties. This is because, in each state, water is still composed of Hydrogen and Oxygen atoms in a 2:1 ratio, represented as H₂O. Even though its physical properties like density, temperature, and appearance change, the fundamental molecular structure remains the same.
For instance, consider liquid water freezing into ice. Though the physical arrangement of the water molecules changes (which accounts for ice's unique property of being less dense than the liquid water), the water molecules themselves remain unchanged. Each water molecule is still composed of two hydrogen atoms bonded to an oxygen atom.
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Determine the concentration of a solution that started out as 0.1 L of a 0.1 M solution and ended with a final volume of 0.5 L.
Answer:
C₂ = 0.02 M
Explanation:
Given data:
Initial volume of solution = 0.1 L
Initial molarity = 0.1 M
Final volume = 0.5 L
Final concentration = ?
Solution:
Formula:
C₁V₁ = C₂V₂
C₁ = Initial volume of solution
V₁ = Initial molarity / concentration
C₂ = Final concentration
V₂ = Final volume
Now we will put the values in formula.
C₁V₁ = C₂V₂
0.1 M × 0.1 L = C₂ × 0.5 L
0.01 M.L = C₂ × 0.5 L
C₂ = 0.01 M.L / 0.5 L
C₂ = 0.02 M
Final answer:
Using the dilution formula M1V1 = M2V2, we determined that the final concentration of the solution that was initially 0.1 M and dilutes from 0.1 L to 0.5 L is 0.02 M.
Explanation:
To determine the concentration of a solution that started out as 0.1 L of a 0.1 M solution and ended with a final volume of 0.5 L, we use the concept of dilution, which is expressed with the formula M1V1 = M2V2, where M1 and V1 are the concentration and volume of the initial solution, respectively, and M2 and V2 are the concentration and volume of the final solution, respectively.
In this case, we plug our known values into the formula:
M1 = 0.1 M (initial concentration)
V1 = 0.1 L (initial volume)
V2 = 0.5 L (final volume)
We want to solve for M2, the final concentration.
Substituting in:
0.1 M * 0.1 L = M2 * 0.5 L
We isolate M2 by dividing both sides of the equation by 0.5 L:
M2 = (0.1 M * 0.1 L) / 0.5 L = 0.02 M
Therefore, the final concentration of the solution is 0.02 M.
wood with a mass of 3.0 grams was burned in an open dish. The ashes weighed 1.2 grams.
What happened to the rest of the wood? B
A
The rest of the wood was burned into gases of equivalent weight.
Explanation:
The rest of the wood was burned into gases of equivalent weight.
When wood is burnt in the open air, with the help of oxygen and heat, it is transformed into carbon dioxide, water vapor, and ashes. Ignition and combustion of wood mainly depend on pyrolysis which is also known as thermal combustion.The loss in weight of the ashes is due to the fact that gases and water vapor are also formed due to the combustion of wood.Lists ways that a bike’s motion can change
Answer: Check explanation
Explanation:
Then bike can't get hit. They can turn the wheel. They can hit the brake
1. Which of the following particles are free to drift in metals?
O neutrons
O cations
O electrons
O protons
Answer:
electrons
Explanation:
metals do what is called metallic bond
An electron is the particles are free to drift in metals.
What is metals?The elements having tendency to lose electron and having properties like lustrous, malleable, ductile, opaque, denser and good conductor of heat and electricity is called metals
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There is a 30 g sample of Be-11. It has a half-life of about 14 seconds.How much will be left after 28 seconds?A.3.75 gB.7.5 gC.15 gD.30 g
Answer:
After 28 sec 7.5 grams of Be will be left
Explanation:
Given data:
Total amount of Be = 30 g
Half life of Be = 14 sec
Mass left after 28 sec = ?
Solution:
First of all we will calculate the number of half lives in 28 sec.
Number of half lives = T elapsed / half life
Number of half lives = 28 sec / 14 sec
Number of half lives = 2
AT time zero = 30 g
At first half life = 30 g/2 = 15 g
At second half life = 15 g/ 2 = 7.5 g
So after 28 sec 7.5 grams of Be will be left.
A 10 gram sample of water is heated to 105 ℃ and is mixed with a 25 gram sample of water cooled to 25℃ . What is the final temperature of the water mixture?
Answer:
The final temperature of the water mixture is 47.85°C
Explanation :
Given,
For Warm Water
mass = 10grams
Temperature = 105°C
For Cold Water
mass = 25grams
Temperature = 25°C
When a sample of warm water is mixed with a sample of cool water,
The energy amount going out of the warm water is equal to the energy amount going into the cool water. This means:
Qlost = QgainHowever,
Q = (mass) (ΔT) (Cp)
Cp = Specific heat of water = 4.184 J/Kg°C
So,
(mass) (ΔT) (Cp) = (mass) (ΔT) (Cp)
We start by calling the final, ending temperature 'x.' Keep in mind that BOTH water samples will wind up at the temperature we are calling 'x.' Also, make sure you understand that the 'x' we are using is FINAL temperature. This is what we are solving for.
The warmer water goes down from to 105°C to x, so this means its Δt equals 105°C − x. The colder water goes up in temperature, so its Δt equals x − 25℃
Substituting the values,
(10)( 105°C − x)(4.184) = (25)(x − 25℃)(4.184)
Solving for x, we get
x = 47.85°C
Therefore, The final temperature of the water mixture is 47.85°C.
Electron Configuration of Mercury?
Answer: Mercury (Hg)
Atomic no.= 80
Electronic Configuration= 1s^2 2s^2 2p^6 3s^2 3p^6 4s^2 3d^10 4p^6 5s^2 4d^10 5p^6 6s^2 4f^14 5d^10. The shortened form of the electronic configuration is: [Xe] 4f14 5d10 6s2.
I hope that this helps you !
How many moles of aluminum hydroxide are needed to react with 25 grams of sulfuric acid?
0.16 moles of Aluminum hydroxide are needed to react with 25 grams of sulfuric acid.
Explanation:
In order to find the number of moles we first need to write down the balanced equation as,
[tex]3 H_{2} S O_{4}+2 A l(O H)_{3} \stackrel{\text { yiek }}{\longrightarrow} \mathrm{Al}_{2}\left(\mathrm{SO}_{4}\right)_{3}+6 \mathrm{H}_{2} \mathrm{O}[/tex]
Now as mentioned above,For 3 moles of sulfuric acid , we need 2 moles of Aluminum hydroxide to balance the equation,
Thus we can balance it as,
[tex]\begin{aligned}25 \mathrm{g} \text { of } \mathrm{H}_{2} \mathrm{SO}_{4} & \times \frac{1 \mathrm{mol} \text { of } \mathrm{H}_{2} \mathrm{SO}_{4}}{98.079 \frac{\mathrm{g}}{\mathrm{mol}}} \times \frac{2 \mathrm{mol} \mathrm{Al}(\mathrm{OH})_{3}}{3 \mathrm{mol} \mathrm{H}_{2} \mathrm{SO}_{4}} \\\\&=0.16 \mathrm{mol} \mathrm{Al}(\mathrm{OH})_{3}\end{aligned}[/tex]
Thus it is now clearly known that 0.16 moles of Aluminum hydroxide are needed to react with 25 grams of sulfuric acid.
According to a weather map, a cold air mass is moving into a given area where a warm air mass is currently located. What type of weather should be expected as the cold air mass approaches? A. rain, accompanied by cooler weather B. clear skies, accompanied by cooler weather C. rain, accompanied by warmer weather D. clear skies, accompanied by warmer weather
Answer:
Rain,accompanied by cooler weather
Answer:
Rain and cooler weather
Explanation:
A box rests on the floor. If you pull sideways on the box with a 300 N force,
but can't move it, what is the net force on the box?
Ο Α) 0 N
O B) less than 300 N
OC) more than 300 N
Answer:
more than 300 N
Explanation:
you have to have more than 300 N of force to move an object that already requires 300 so 301 N would push it but very slowly
How do i balance this
Na + Cl² =NaCl
Explanation:
Balancing equation
Explanation:
In the given reaction, sodium is reacting with chlorine to produce sodium chloride
The chemical equation involved is
Na+Cl_2\rightarrow NaClNa+Cl2→NaCl
When the number of atoms for the reactant side is calculated it gives:
Na = 1
Cl = 2
When the number of atoms for the product side is calculated it gives:
Na = 1
Cl = 1
The obtained result indicates that the Chlorine atom is not equal on both sides. Thus the reaction is not balanced.
The balanced reaction has the number of atoms involved in reaction in reactants as well as the product is equal.
To make both side equal some changes must be made as shown in the balanced equation is
2Na+Cl_2\rightarrow 2NaCl2Na+Cl2→2NaCl
For the above equation, the number of atoms in the reactants is:
Na= 2
Cl = 2
The number of atoms in products is:
Na = 2
Cl = 2
As the number of atoms in the reactants side is equal to the number of atoms in the product side, the reaction is balanced.
What happens when an amorphous solid breaks?
O
A. The solid breaks at predictable places.
O
B. The solid breaks at random places.
O
C. The break follows a crystal pattern.
O
D. The solid shears in flakes or planes.
Answer:
IT BREAKS AT RANDOM PLACES!!!!
An amorphous soild breaks at the random places
Which is an amorphous solid?
Amorphous solid, any noncrystalline solid in which the atoms and molecules are not organized in a definite lattice pattern. Such solids include glass, plastic, and gel.
Which of the following is a property of the amorphous solid?These solids are stabilized by the regular pattern of their atoms. Their characteristic properties include distinct melting and boiling points, regular geometric shapes, and flat faces when cleaved or sheared.
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Based on its location on the periodic table, how many electrons does oxygen have in its outer energy level?
03
04
05
06
Answer:
The number of electrons in the outer energy level of oxygen is 6.
Explanation:
Oxygen is present in the group 16 of the periodic table. The electronic configuration of group 16 element is [tex]ns^{2}np^{4}[/tex]. The number of electrons in outer energy level of group 16 element is always found to be 6.
The addition of the number of the electrons present in the valence shell orbitals of oxygen will give the total number of electrons present in the outer energy level.
The number of electron in the outer energy level of oxygen is (2 + 4) = 6.
How many moles are in 135g of Teflon?
1.34 moles are in 135g of Teflon.
Explanation:
Molecular formula of teflon is (C2H4)n
mass of teflon = 135 grams
atomic mass of teflon = 100.01 gram/mole
number of moles of teflon = ?
Formula used to calculate number of moles in a substance is given as:
number of moles = [tex]\frac{mass}{atomic mass of 1 mole}[/tex]
putting the values in the above equation:
number of moles = [tex]\frac{135}{100.01}[/tex]
number of moles = 1.34 moles
Teflon is polymer which is used for making non-stick coating, in 135 grams of teflon there are 1.34 moles in it.
Using the formula for calculating moles (mass/molar mass), we find that there are roughly 0.27 moles in 135g of Teflon.
Explanation:To calculate the number of moles in a given mass of a substance, we use the formula:
Number of moles = Mass (in grams) / Molar Mass (in g/mol).
Teflon is also known as polytetrafluoroethylene (PTFE), and its molar mass is roughly 500 g/mol. So, to find the number of moles in 135g of Teflon, we divide:
Number of moles = 135 g / 500 g/mol = 0.27 moles.
Therefore, there are around 0.27 moles of Teflon in a 135g sample.
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Will mark brainliest! Pls help
Answer:
3. I don’t have a chart, but this is the
most salt per volume. It is all I have.
Explanation: