Help with chemistry question. Look at image.
Answer:
It is called the periodic table because of the way he elements are arranged. You'll notice they're in row and columns. The horizontal rows are called periods and the vertical columns are called groups. (so I believe it's A or C) sorry if I get this wrong..
What evidence supports a scientist's conclusion that fossil B is older than fossil A? (4 points)
a
Fossil A and fossil B were both found at the same depth below Earth's surface.
b
Fossil B was found at a depth of 185 meters below Earth's surface, while fossil A was found at a depth of 50 meters below Earth's surface.
c
Fossil B was found at a depth of 50 meters below Earth's surface, while fossil A was found at a depth of 185 meters below Earth's surface.
d
Fossil A was found below Earth's surface, while fossil B was found at surface level.
Plz help need this fast!
Answer:
Choice B, as time goes on the surface level rises and stuff buried underground gets further and further below surface level.
I must type a short response. Can anyone help me out?
Explanation:
The fluids seperated because of the different density of the liquids. The lower liquid has a high density while the liquid on top has a low density
The more quickly you change your _____, the more ____ you will have to exert
Answer:
name, force
Explanation:
Why does the salt reappear when the water evaporates??
Answer:
Salt particles move about the water. Each particle is surrounded by water molecules.The water particles (molecules) keep the salt particles from rearranging themselves back into a salt crystal. Salt particles are carried throughout the solution surrounded by water particles.
As the water evaporates less and less water molecules are present to keep the salt particles apart. The salt therefore recrystalises and can be collected.
Explanation:
Hope this helped!
-B
in an equilibrium reaction with a Keq of 1×10^8,the-
A) reaction are favored
B) reaction is exothermic
C) products are favored
D) reaction is spontaneous
How do volcanos such as ojos del salado form?
Answer:
Deep inside Earth, between the molten iron core and the thin crust at the surface, there is a solid body of rock called the mantle. When rock from the mantle melts, moves to the surface through the crust, and releases pent-up gases, volcanoes erupt.
Explanation: hot molten rock, ash, and gases escape from the volcano
Which type of substance have a definite shape and fixed volume?
Solids only
Liquids and solids
Gases only
Liquids and Gases
Which of the following geographical features acted as a natural defense for Egypt against enemies from the south? A. the Nubian desert B. the Mediterranean Sea C. the cataracts of the Nile D. the black silt on the river banks Please select the best answer from the choices provided A B C D
Answer:
C
Explanation:
The geographical features acted as a natural defense for Egypt against enemies from the south is cataracts of Nile. Hence, option C is correct.
What is cataracts of Nile ?The Nile River, one of Egypt's most notable natural features, was the envy of neighboring civilizations and allowed the Egyptians maintain contact with populations in the Mediterranean region.
Huge deserts extend well beyond the lush terrain that surrounds the Nile River on both sides. The Sahara Desert, the world's biggest desert, is to the west. More desert and the Red Sea may be found east of the Nile. These deserts served as an excellent natural defense against invaders.
The Egyptians had built-in fortifications thanks to the river and the desert. The delta of the Nile River is swampy. Egypt was unable to construct a port at the mouth of the Nile as a result. Invaders found it hard to approach Egyptian villages along the river as a result.
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How many electrons does gallium give up when it becomes an ion?
Answer:
3 electrons comrade
Explanation:
JANKS is looking under a microscope and sees a colony of green cells living on a spherical structure. She is most likely to be observing a...
A. volvox
B. Amoeba
C. Paramecium
D, Euglena
Answer:
euglena
Explanation:
hope this helps
If an object has a volume of 3 cm3 and has a density of 9 g/cm3. What is the mass of the object?
3 grams
6 grams
27 grams
81 grams
Answer:
The answer is 27 gramsExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volume
From the question we have
mass = 9 × 3
We have the final answer as
27 gHope this helps you
Which of the following solutions of glucose in water will have the lowest freezing point?
(The molar mass of glucose is 180 g/mol.)
Answer:
B
Explanation:
Colligative properties are properties that depend on the amount of substance present.
Freezing point is a colligative property hence it depends on the number of moles of the glucose present in solution. The bigger the concentration of the glucose molecules, the greater the freezing point depression. So, the largest freezing point depression is observed for the solution having the highest concentration of glucose.
Which statement describes the charging method shown?
The spheres are charged through friction.
The spheres develop the same charge.
Electrons move from the rod to Sphere A.
Electrons move from Sphere A to Sphere B.
Answer:
D
Explanation:
correct on edge 2021 :)
The movement of the electrons from sphere A to sphere B is shown as the charging method. Thus option D is correct.
What is an electron?An electron is a negatively charged subatomic particle and can either be free or bound to the nucleus and it exists in a spherical shell. of the various radii that represent the energy levels. The movement of the electron from sphere one to sphere two is represented by the image.
Find out more information about the charging method.
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what do the suffix in a polyatomic ion mean
Answer: The suffixes of the names of polyatomic ions have a pattern associated with them. ... For example, the sulfite ion has three oxygen atoms whereas the sulfate ion has four oxygen atoms.
write the number 3000,000,000 in scientific notation
Answer:
3 x 10^9
Explanation:
how many electrons in an atom with the electron configuration of 1s2 2s2 2p6 3s1
Taking into account the definition of electronic configuration and the Aufbau principle, in an atom with the electron configuration of 1s²2s²2p⁶3s¹, there are 11 electrons.
Electronic configurationThe electronic configuration of elements is the arrangement of all the electrons of an element in energy levels and sublevels (orbitals).
There are 7 energy levels, numbered from 1 to 7, and in which the electrons are distributed, logically, in order according to their energy level. Electrons with less energy will spin at level 1.
Each level is divided into sublevels. These sublevels into which each level is divided can be up to 4. These 4 sublevels are called: s, p, d, f.
In the s sublevel there can only be a maximum of 2 electrons, in p there can be a maximum of 6 electrons, in the d sublevel 10 electrons and finally in the f sublevel there can be a maximum of 14 electrons.
At level 1 there is only one sublevel, which will be the s. In level 2 there are 2 sublevels, the s and the p. At level 3 there are 3 sublevels s, p and d. And in level 4 there are 4 sublevels, the s, the p, the d and the f.
Aufbau's principleThe Aufbau principle is a principle of atomic physics, which explains how electrons arrange themselves in their orbits around the nucleus of the atom.
This principle states that the filling of these orbitals occurs in order of increasing energy, that is, from orbitals of lower energy to those of higher energy.
The simplest of the sublevels is 1. If you fill the 1s, you can start filling the 2s. Once the 2s sublevel is satisfied, the 2p can start filling, and so on.
Amount of electronsIn this case, in an atom with the electron configuration of 1s²2s²2p⁶3s¹, there are 2+2+6+1= 11 electrons.
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Evaluating Lewis Structures
Explain what is wrong with the following structure.
An upper H is single-bonded to a H to the right, which is single bonded to an upper O with pairs of dots above, to the left, and below.
Answer:
Hydrogen cannot have more than two electrons. Hydrogen bonds to only one other atom at a time.There are too many electrons in the final structure.
Explanation:
Answer:
Explanation:
Hydrogen cannot have more than two electrons. Hydrogen bonds to only one other atom at a time. There are too many electrons in the final structure.
how many atoms are in Tetrachloroauric acid
Answer:
29 i think
Explanation:
What is a limiting reagent? A.) The reactant that is used up first in a reaction B.) The reactant that is used the least reactive in a reaction C.) the reactant with the smallest coefficient in the equation D.) the reactant with the largest coefficient in the equation
Answer: A.) The reactant that is used up first in a reaction
The reactant that is totally consumed during a reaction, or the limiting reagent, decides when the process comes to an end. A limiting reagent is the reactant that is used up first in a reaction. Therefore, option A is correct.
What is a limiting reagent?A reactant that is completely consumed at the end of a chemical reaction is known as the limiting reagent. Since the reaction cannot proceed without this reagent, the amount of product that can be produced is constrained.
The limiting reactant is the one that is consumed first and sets a limit on the quantity of product(s) that can be produced. Calculate how many moles of each reactant are present and contrast this ratio with the mole ratio of the reactants in the balanced chemical equation to get the limiting reactant.
The terms limiting reagent and limiting agent may also be used to describe the limiting reactant.
Thus, option A is correct.
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How many grams of CaCl2 are need to prepare 250 mL of a 0.15M solution?
Answer:
Here is what I got from reading this question...
Explanation:
So if you dissolve 7.5625- g of CaCl2 in water, dissolve well and then add distilled in a 250- ml standard flask upto the mark and shake well for uniform Concentration, you will get 0.25- M CaCl2 solution.
How much power, in watts, is needed to cut a lawn in 50 min if the work involved is 100,000 J?
Answer:
33.33 Watt
Explanation:
we know that P= W/t
W= work
t= time (in seconds)
so here
W= 100,000J
and t= 50 min= 50×60 sec= 3000 s
so P= 100,000/ 3000
=100/3 = 33.33Watt
All atoms of the same element:
have the same number of electrons
have the same number of protons
have the same number of atoms
have the same number of neutrons
Answer:
have the same number of atoms
Explanation:
Atoms of the same element have the same atomic number so the number of protons (and electrons) are same. But they have same or different mass number (like that for isotopes) . Different mass number will have different number of neutrons.
Answer:
Same number of atoms
(Mark the other person brainliest :-D)
Explanation:
Simple chemistry question please help. Look at image.
It's the last one. They all have the same number of electrons in their outer ring. They're also called valence electrons.
Hope this helped!
How is energy sent from Earth to space?
conduction and convection
radiation and conduction
reflection and conduction
radiation and reflection
Answer:
radiation and reflection
Explanation:
Energy is send from space to earth by radiation and reflection. The most predominant way in which heat is transferred from earth to space is by radiation.
The source of energy for the earth is heat from the sun. This heat can be sent back to space when they are reflected back from the earth and radiated into space.Answer:
radiation and reflection
hope helps you
have a nice day
The energy released in cellular respiration helps an athlete perform. How do you think an athlete might be able to increase cellular respiration?
pls i will give brainliest
eating healthy foods
working out and eating healthy helps
Answer:
higher as
beacause having a healthy diet inproves
your health
Explanation:
Acid rain is an example of _____________ weathering
Answer:
a chemiacal
Explanation:
Which of the following contains the most atoms?
24.305 g Mg
39.098 gk
21.62 g B
9.0122 g Be
Explanation:
9.0122 g be Maybe, sorry i don't think so
In the above , the sample of B 21.62 g of boron contains the most atoms because it has approximately 2 moles, while the other samples have only 1 mole each.
What is atomsThe molar mass of each element can be found on the periodic table.
The molar mass of Mg (magnesium) is about 24.305 g/mol.The molar mass of K (potassium) is about 39.098 g/mol.The molar mass of B (boron) is approximately 10.81 g/mol.The molar mass of Be (beryllium) is about 9.0122 g/mol.To calculate the number of moles in each sample, we divide the mass of each sample by its respective molar mass:
For Mg: Number of moles = 24.305 g / 24.305 g/mol = 1 moleFor K: Number of moles = 39.098 g / 39.098 g/mol = 1 moleFor B: Number of moles = 21.62 g / 10.81 g/mol ≈ 2 molesFor Be: Number of moles = 9.0122 g / 9.0122 g/mol = 1 moleTherefore, the sample with 21.62 g of boron (B) contains the most atom
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1 Compressing a spring increases its
A kinetic energy
B potential energy
C electrical energy
D chemical energy
Please help immediately this is a question on my test. <3
(Science)
Answer:
Potential Energy
Explanation:
By compressing the spring there is more potential energy.
Consider the following reaction: 4HCl(g)+O2(g)→2H2O(g)+2Cl2(g) Each of the following molecular diagrams represents an initial mixture of the reactants.(Figure 1)
How many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of products?
Answer:
A
Explanation:
The number of molecules of Cl₂ that would be formed from the reaction mixture that produces the greatest amount of products is 4.
What are molecular diagrams?Molecular diagrams are the representations of the chemical reaction, with the help of molecular orbital theory. They show the chemical bonding and linear combination of the elements.
Now, here the reaction is
4HCl(g)+O₂(g)→2H₂O(g)+2Cl₂(g)
Diagram b has 8 molecules of HCl (limit reagent) and 3 molecules of O₂. This is the reaction that will produce the greatest amount of product.
Hence, b is taken for the number of chlorine.8 molecules of HCl need to combine with 2 molecules of oxygen to produce 4 molecules of Cl₂. The reaction's stoichiometry shows this to be the case.
Thus, there will be four, 4 molecules of chlorine that would be formed from the reaction.
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