Mercury, Venus, Earth,Mars
Answer:
D: Mercury, Venus, Earth, Mars
Explanation:
All of the land area that supplies water to a particular river system is called a
Answer:
A Watershed
Explanation:
A watershed consists of all the land that supplies water to a river system
Answer:
watershed
Explanation:
A neutral aluminum atom is ionized and loses 3 electrons. What is the
charge of the resulting aluminum ion?
Explanation:
The neutral aluminium atom loses all 3 of its valence electrons to obtain a stable octet structure.
The aluminium ion has a positive charge of 3.
=> Al3+, Charge = +3.
I have a brick, dimensions 4 cm tall, 9 cm wide, and 25 cm long, with a mass of 1250 g. What is the density?
Answer:
1.389
Explanation:
P = m / V
m = 1250
V = 4x9x25 = 900
1250/900 = 1.388889
9. Write a balanced nuclear equation for the following: The isotope Strontium-90 decays by Q-
decay (1 point)
OfSr — He +56 kr
OS → H +39 kr
o Sr + Be +38kr
99 Sr → He +3 Se
SAST +7+99 Sr
Answer: [tex]_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\textrm{He}[/tex]
Explanation:
Alpha Decay: In this process, a heavier nuclei decays into lighter nuclei by releasing alpha particle. The mass number is reduced by 4 units and atomic number is reduced by 2 units.
General representation of an element is given as: [tex]_Z^A\textrm{X}[/tex]
where,
Z represents Atomic number
A represents Mass number
X represents the symbol of an element
General representation of alpha decay :
[tex]_Z^A\textrm{Sr}\rightarrow _{Z-2}^{A-4}Y+_2^4\alpha[/tex]
The balanced nuclear equation when the isotope Strontium-90 decays by Q- decay is :
[tex]_{38}^{90}\textrm{Sr}\rightarrow _{36}^{86}\textrm{Kr}+_2^4\textrm{He}[/tex]
Identify the two gases jn the unknown mixtures.
Answer:
I believe Gases A and D
Explanation:
The lines in both gases match up with the lines in the unknown mixture.
Answer:
Fa (rt) and Nitrogen
Explanation:
Which type of bond will form between these elements?
O Metallic
O lonic
Covalent
Answer:
covalent
Explanation:
What is the multiplier used to find the MF?
This is chemistry (Empirical and Molecular from % Composition)
pls help!!!!
Answer:
Molecular Formulas for Compounds
Explanation:
Need help don’t understand this??!
What is the overall process of balancing an equation?
Answer:
You need to make sure the number of atoms of each element on the reactant side is equal to the number of atoms of each element on the product side. In order make both sides equal, you will need to multiply the number of atoms in each element until both sides are equal. :)
a bubble of methane gas rises from the bottom of the north sea, what will happen to the size of the bubble as it rises to the surface? explain your answer
Hope my answer helps you.
what is the position of lanthanides in Modern Periodic Table
Answer:
in sixth period out of 32 elements, 14 elements have been placed separately in horizontal row below periodic table.
what do you mean by sI unit
The rate of acceleration of an object is determined by the mass of the object and...
A) The forces acting on the object
B) The change in kinetic energy of the object
C) The initial velocity of the object
D) The direction of movement of the object
Answer:
a. forces acting on the object
What is sublimation and what type change is this?
Answer:
Sublimation is a physical change. When a substance sublimes, it changes from a solid to a gas without going through the liquid phase.
Explanation:
What elements are made from the body
Answer:
hydrogen oxygen carbon and nitrogen
Calculate poH if given pH of 9.3
14
4.7
5.01 x 10^-6
Answer: Option (b) is the correct answer.
Explanation:
It is known that,
pH + pOH = 14
So, pOH = 14 - pH
As the given pH is 9.3. Hence, pOH for the given solution will be calculated as follows.
pOH = 14 - 9.3
= 4.7
Therefore, pOH of the given solution is 4.7.
Question 9 (1 point)
Circuits can flow in any direction. (Lesson 5.05)
True
False
Answer:
It would be false because there are series circuit that only has one path
Which of the following characterizes a covalent bond?
A. An electronegativity of greater than 1.7 for one of the atoms
B. An electronegativity difference of greater than 1.7 between two
atoms
C. An electronegativity difference of less than 1.7 between two
atoms
D. An electronegativity of less than 1.7 for one of the atoms
Answer A. The electronegativity of one atom is less than 1.7
Answer: its C
Explanation: i just got it wrong the right answer is c
What mass of radon is in 8.17 moles of radon?
Answer:
1813.74g
Explanation:
Given parameters:
Number of moles of radon = 8.17moles
Unknown:
Mass of radon = ?
Solution:
To solve this problem, we use the expression below:
Number of moles = [tex]\frac{mass}{molar mass}[/tex]
Molar mass of radon = 222g/mol
Now insert the parameters and solve;
Mass of radon = Number of moles x molar mass
= 8.17 x 222
= 1813.74g
What caused the shielding effect to remain constant across a period
Answer:
When moving from left to the right of a period, the number of electrons increases and the strength of shielding increases. As you move across period the number of shells remain same, the shielding effect will also remain constant.
Explanation:
15. If I make 94.8 L of O2, how many grams of H2O did I start with? (Show ALL work)
Answer:
double
Explanation:
.
given that the mean relating atomic mass of chlorine gas is 35.5 and contains a mixture of two isotopes of mass number 35 and 37 . Calculate the ratio of each isotope in the naturally occurring element
The abundance of isotope 35 = 75%
The abundance of isotope 37 = 25%
Ratio isotope 35 : isotope 37 = 3 : 1
Further explanationGiven
Ar Cl = 35.5
Two isotopes of mass number 35 and 37
Required
The ratio of each isotope
Solution
If the abundance of isotope 35 is x%, then the abundance of isotope 37 is (100-x)%
35.5 = x%.35 + (100-x)%.37
35.5 = 0.35x+0.37(100-x)
35.5=0.35x-0.37x+37
0.02x=1.5
x=75
How many moles of ammonia are in 0.175 L of 6.50 M aqueous ammonia solution? Find the numerical answer for this questions make sure to include the following : What is the chemical formula for ammonia? What is the formula for molarity ? When you give your numerical answer, what is the correct significant figures and how do you know that is the correct amount?
Moles of Ammonia (NH₃) in solution = 1.14
Further explanationGiven
0.175 L of 6.50 M aqueous ammonia
Required
moles of ammonia
Solution
Ammonia = NH₃
Molarity = moles of solute per liter of solution
[tex]\tt M=\dfrac{n}{V}[/tex]
n = M x V
n = 6.50 M x 0.175 L
n = 1.1375 moles
In a multiplication operation: the significant digits in the final product must follow the number of significant digits that are at least in the numbers involved in multiplying
6.50 = 3 sig fig
0.175 = 3 sig fig
So the result must be 3 sig fig
1.1375 rounded to 1.14
Which of the following phase changes requires the addition of thermal energy?*
• Condensation
• Vaporization
• Deposition
• Freezing
Will mark the person who answers correctly Brainliest<\3
Answer: Option (b) is the correct answer.
Explanation:
When thermal energy is added to a substance then there will occur an increase in the kinetic energy of molecules. As a result, motion of particles increases due to which a solid substance changes into liquid state and a liquid substance changes into gaseous state.
When a liquid substance gets converted into vapors or gaseous state then this process is called vaporization.
Thus, phase changes that requires the addition of thermal energy is vaporization.
Look at the above table.
1. What charge should Element 1 have (B)
A. 0
B. 1+
C. 6
D. 12
2. How many neutrons should Element 2 have (C)
A. 11
B. 7
C. 13
D. 6
3. How many valence electrons does carbon have?
A. 6
B. 2
C. 4
D. 3
Answer:
1. A. 0
2. B. 7
3. C. 4
Explanation:
1. charge is equal to the number of protons minus the number of electrons!
2. neutrons is equal to mass number minus atomic number!
3. valence electrons equal 4!
Hope this helped you! :)
help!!
The volume of air in the lungs of a typical human is 6.0 L. Traditional free divers, known for their ability to hold their breath during long dives while gathering objects from the ocean bottom, could descend underwater to a depth of 30 m where the pressure is four times that at the surface. What would be the volume of air in their lungs at 30 m?
please!!
Answer: these are for questions 1,2,4,5,7
Explanation: number 3: as the pressure in the volume decreases, the volume increases causing it to expand and eventually blow.
number 6: because the temperature and the amount of gas don’t change, these terms don’t appear in the equation. What Boyle’s law means is that the volume of a mass of gas is inversely proportional to its pressure. This linear relationship between pressure and volume means doubling the volume of a given mass of gas decreases its pressure by half.
hope this helps :))
What best describes the atom if it has 9 protons, 9 neutrons and 10 electrons?
A compound with a mass of 48.72g is found to contain 32.69g of zinc and 16.03g of sulfur. What is the percentage composition of the compound
Answer:
dic
Explanation:
How do warm air molecules move?
A. They move quickly and rise over warm surfaces
B. They move slowly and rise over cold surfaces
C. They move quickly and sink over warm surfaces
D. They move slowly and sink over cold surfaces.
Answer:
A
Explanation:
In which item are fuel cells more commonly used?
laptops
flashlights
solar panels
propane lanterns
A fuel cell require a continuous input of fuel and an oxidizing agent in order to sustain the reactions which generate the electricity. The item in which fuel cells more commonly used is propane lanterns. The correct option is D.
What is propane lanterns?The propane lanterns is one of the gas interns which is a lightweight portable device which supplies bright efficient light while protecting its contents from wind and brain. The gas interns are incandescent lights.
The gas interns burn fuel like propane, white gas or kerosene to generate heat and the heat causes the mantles to produce light. The mantles are defined as the ceramic mesh which encase the flame produced by the lantern.
The gas lanterns are very simple, any heated material will produce light. The lantern burns fuel to produce heat. The gas lanterns use mantles instead of limestone blocks. The mantles are highly efficient at producing light from the heat they acquire.
Thus the correct option is D.
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