Answer: -
D. scientists predict a volcano will erupt in the near future because of current volcanic activity
Explanation: -
Reconstruction involves analyzing evidence present to understand what happened before. For example scientists assume an area was once undersea due to the types of rock deposits. The area was under sea before.
Scientists assume an animal was a meat eater because of the teeth in its fossil. Again the animal was before.
Scientists assume an animal could climb trees because of its hand structure . The animal existed before. Now no longer present.
But in D scientists predict a volcano will erupt in the near future because of current volcanic activity, the event of eruption could occur in the future. It has not happened already like in the previous cases.
Earth's path around the sun is _____.
a) eliptical
b) circular
c)random
d) triangular
The reactant Zn is an
element
an ionic compound
a molecule
an oxide.
HELP FAST PLZ!!!!
which statement describes the role of decomposers in the carbon cycle?
A they release the carbon that remains in the bodies of dead organisms.
B they prevent carbon from escaping into the atmosphere
C they absorb carbon dioxide in the atmosphere
D they change carbon dioxide into a form that organisms can use.
Answer:
Your answer would be A.
Explanation:
I took a quiz with the same exact question
An air mass of volume 6.5 x 10 to the fifth L starts at sea level, where the pressure is 775 mm HG. It rises up a mountain where the pressure is 622 mm HG. Assuming no change in temperature, what is the volume of the air mass?
Which equation shows conservation of mass? A. H2O → H2 + O2 B. PCl5 → PCl3 + Cl2 C. Na + Cl2 → NaCl D. Al + Br2 → AlBr3
Answer:
B. PCl₅ → PCl₃ + Cl₂.
Explanation:
The conservation of mass is a phenomena that is applicable and found in chemical reaction but only balance chemical reactions.Balanced chemical reaction means that: The number of atoms of the reactants = the number of atoms in the products.In balanced chemical reaction; the atoms that enter and participate in the reaction will result from it and maintain the mass of each atom.The first choice (A) is wrong that it is unbalanced chemical reaction,H₂O → H₂ + O₂, the oxygen has 1 atom in the reactants side while has 2 atoms in the products side.
to be balanced and apply conservation of the mass it should be: H₂O → H₂ + 1/2O₂.
The second choice (B) is the right answer: PCl₅ → PCl₃ + Cl₂.The number of atoms of P (1 atom) and Cl (5 atoms) are the same in both sides of reactants and products.
The third choice (C) is wrong that it is unbalanced chemical reaction,Na + Cl₂ → NaCl, the Cl has 2 atoms in the in the reactants side while has 1 atom in the products side.
to be balanced and apply conservation of the mass it should be: Na + 1/2Cl₂ → NaCl.
The fourth choice (D) is wrong that it is unbalanced chemical reaction,Al + Br₂ → AlBr₃, the Br has 2 atoms in the in the reactants side while has 3 atoms in the products side.
to be balanced and apply conservation of the mass it should be: 2Al + 3Br₂ → 2AlBr₃.
The law of conservation of mass states that matter cannot be created nor destroyed. In chemical equations, this is demonstrated by having an equal number of atoms for each element on both sides of the equation. Thus, the balanced chemical equation PCl5 → PCl3 + Cl2 shows the conservation of mass.
Explanation:The principle of the conservation of mass is demonstrated by a balanced chemical equation, which has an equal number of each element's atoms on both sides. In the options given, the correct equation demonstrating mass conservation is PCl5 → PCl3 + Cl2. This equation rightly represents the law of conservation of mass as the number of atoms for each element is equal on both the reactant and the product side.
Out of the other options, H2O → H2 + O2 is incorrect because there is only 1 oxygen atom in the reactant side (in H2O) but 2 in the product side (in O2). Both Na + Cl2 → NaCl and Al + Br2 → AlBr3 do not conserve mass, as they don't have equal number of atoms for each element on both sides of the equation.
Remember, to show conservation of mass in a chemical reaction, the equation must be balanced, meaning it must contain equal atoms of each element on the reactant side and the product side, highlighting the fact that in any process, matter is neither created nor destroyed.
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what are the four main spheres of the earth system
How hot or cold is Mercury
30ml of 0.10 NaOh neutralized 25.0ml of HCL determine the concentration of the HCL? PLEASE HELP ME ASAP
An electromagnetic wave that has a lower frequency than infrared radiation will have ____ than the infrared radiation. longer wavelength and higher energy longer wavelength and lower energy shorter wavelength and higher energy shorter wavelength and lower energy
The answer is longer wavelength and lower energy.
Both algae and amoeba are in the domain Eukarya. Which of the following characteristics do they most likely share?
They both belong to the plant kingdom.
They both have cells with no nucleus.
They both have cells with membrane-bound organelles.
They both belong to the animal kingdom.
Answer: They both have cells with membrane- bound organelles.
Explanation:
The domain eukarya includes the eukaryotic organisms, which range in diversity from single celled to multicellular. These organisms have cells that have membrane bound organelles, nucleus is present in them. These organisms range from simple to complex life cycles.
Hence, both algae and amoeba which belong to domain eukarya have membrane bound organelles in their cells.
Answer:
C, They both have cells with membrane-bound organelles.
Explanation:
I did the module exam
A piece of copper at 10 °C is dropped into a glass of water at 35 °C. Which statement is correct?
A. Heat will flow from the copper to the water in the glass until both reach the same temperature.
B. Heat will flow from the water in the glass to the copper until both reach the same temperature.
C. The final temperature of the water in the glass and the copper will be 10 °C.
D. The final temperature of the water in the glass and the copper will be 35 °C.
Answer:
The correct answer is option B, that is, heat will flow from the water in the glass to the copper until both reach the same temperature.
Explanation:
Let us see a perfectly thermal insulation system with a glass of water at higher temperatures and a piece of copper at a lower temperature, and when both encounters each other than water will lose some of the heat and that heat will be gained by the copper. The procedure will take place until and unless both attain a similar temperature. After attaining a similar temperature, there will be no change in temperature or heat between the two. The change in heat is a function of temperature difference.
How will the arrangement of salt particles most likely change?
Answer:
Salt particles will diffuse and towards where it is less that is left !!
so your answer is A !! left through diffusion !!
Explanation:
Name two other compounds with bonding similar to that in hydrogen bromide
What is a physical property of water?
A) liquid at room temperature
B) not flammable
C) pH of 7
D) reacts with sodium
HEELLP PLEEASEE I GIVE 30 POINTS + BRAINLIEST!!!!!! HELPP PLEEAASEE
How many milliliters are in 22 mm3?
As part of a science experiment, Jose did a test for starch on a slice of apple and a slice of potato. The yellow-orange iodine solution stayed the same color when it was put on the apple, but it became black on the potato. Why did the iodine solution change color on the potato? A. The iodine evaporated into a gas. B. The iodine mixed with the colors of the potato so it looked black. C. The iodine burned the potato and turned it to ash. D. The iodine reacted with the potato to form a new substance.
Answer:
The iodine reacted with the potato to form a new substance.
Explanation:
Which of the following is an example of a population?
Question 7 options:
all of the western diamondback rattlesnakes in Big Bend National Park
all plants and animals in Grand Canyon National Park
all leopard frogs in the world
all of the trees in Yellowstone National Park
In biology, a population is made up of all individuals of a specific species within a certain area. Thus, the example that best fits this definition is all of the western diamondback rattlesnakes in Big Bend National Park.
Explanation:In biology, a population consists of all the individuals of a certain species living within a specific area. Therefore, the best example of a population among the options provided is all of the western diamondback rattlesnakes in Big Bend National Park. This is because this group contains only one species (western diamondback rattlesnakes) and is limited to a specific area (Big Bend National Park).
Alternatively, the other options contain either multiple specie (all plants and animals in Grand Canyon National Park and all of the trees in Yellowstone National Park) or include a species that is not confined to a specific area or region (all leopard frogs in the world).
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There are islands in the ocean that are growing larger. The Hawaiian Islands are good examples of this. The reason that the islands were formed and are still growing is A) they were produced by drought. B) they were produced by volcanoes. C) they were produced by hurricanes. D) they were produced by earthquakes.
A 100 meter dash was held with 20 contestants. The best time was 10.7 seconds, and the worst time was 15.3 seconds. Only the fastest 10 contestants advance to the final race. Which measure of central tendency should be used to calculate the cutoff time for the final race? A. median B. mode C. mean D. range
Answer:
median
Explanation:
study island i got it right
Answer:
median
Explanation:
Why are sound recordings needed to preserve sound information
Choose all that apply.
Gas pressure within a fixed container will increase when ____
A) gas is cooled
B) gas is heated
C) gas volume changes
D) mass of gas is increased
B) Gas is heated, And D) Mass of gas increased.
Gas pressure within a fixed container will increase when gas is heated and also when mass of gas is increased.
Answer: Options B and D
Explanation:
In a closed container, the temperature is proportional to pressure according to the pressure law. When the gas presents in a container, it means that the size of the container remains constant unless/until it is changed by increasing its size or decreasing it.
When the container gets heated, gas particles gains more kinetic energy, moves faster and hits the inner walls of the container. The amount of gas particles also seems to be more.
And so, it hits the container's wall more frequently and with more speed and force. Hence, these make the gas pressure in the container to increase. According to the Boyle’s law,
[tex]p V=n R T[/tex]
Where, p – pressure, V – volume, n – no. of moles, R – gas constant, T – temperature.
This also tells the reason how the gas pressure increases when the amount of gas and temperature get increased.
Properties such as luster, conductivity, and flexibility are used to describe what type of elements
Answer:
A.metals is the correct answer
If the wavelength of one wave is 0.25 or ¼ meters, how many waves will be formed in one meter?
What is the source of energy that is released in an exothermic reaction? what absorbs the energy that is released ?
When an electron moves to another orbital farther from the nucleus, does it gain or lose energy?
What evidence do scientists have that Earth has been hit by large objects, like asteroids, in the past? Check all that apply.
for an experiment, you need 0.10 moles of NaCl for a chemical reaction. how much NaCl must you weigh out?
A. 0.14g
B. 3.2 g
C. 8.2 g
D. 5.8 g
The mass of NaCl needed for the reaction, you can use the molar mass of NaCl and the given number of moles. The molar mass of NaCl is 58.44 g/mol. By multiplying the number of moles (0.10) by the molar mass, you can calculate the mass of NaCl needed, which is approximately 5.844 g. Option D, 5.8 g, is the closest answer.
To calculate the mass of NaCl needed for the reaction, you can use the molar mass of NaCl and the given number of moles. The molar mass of NaCl (sodium chloride) is the sum of the atomic masses of sodium (Na) and chlorine (Cl). The atomic mass of sodium is approximately 22.99 g/mol, and the atomic mass of chlorine is approximately 35.45 g/mol.
Molar mass of NaCl = Atomic mass of Na + Atomic mass of Cl
= 22.99 g/mol + 35.45 g/mol
= 58.44 g/mol
Now, you can use the formula:
Mass = Number of moles × Molar mass
Mass = 0.10 moles × 58.44 g/mol
Mass = 5.844 g
Therefore, the correct answer is closest to 5.8 g, which corresponds to option D. Therefore, you should weigh out 5.8 g of NaCl for the chemical reaction.
How many atoms of oxygen are in one formula unit of Al2(SO4)3? 4 6 7 12
What is the name of the compound Cr2(CO3)3?
Which of the following contains both ionic and covalent bonding?
NaClO
NO2
FeBr3
HI
The equation Mg(s) + 2HCl(aq) → MgCl2(aq) + H2(g) is an example of which type of reaction?
Answer : This is an example of single-displacement reaction.
Explanation :
Single-displacement reaction : It is a type of reaction in which the more reactive metal displaces the least reactive metal from its solution.
It is represented as :
[tex]A+BC\rightarrow AC+B[/tex]
where A is the most reactive metal and BC is the compound in which the B is the least reactive metal which is displaced by the most reactive metal A.
The given balanced reaction is,
[tex]Mg(s)+2HCl(aq)\rightarrow MgCl_2(aq)+H_2(g)[/tex]
This reaction is an example of single-displacement reaction in which the magnesium metal displaces the hydrogen metal from its solution to give magnesium chloride and hydrogen gas as a product.
Hence, the given reaction is an example of single-displacement reaction.