Answer:
8 electrons
Explanation:
The atomic number of calcium (ca) is 20. Therefore,
in the first shell the number of electrons are 2
in second shell the number of electrons are 8
in the third shell the number of electrons are 8
in the fourth shell the number of electrons are 2
electronic configuration in ground state:
1s^2, 2s^2, 2p^6, 3s^2, 3p^6, 4s^2
Hope it helps u (｡◕‿◕｡)
What is true about matter?
A. Matter has mass and takes up space.
B. Matter has mass but does not take up space.
O C. Matter takes up space but does not have mass.
O
D. Matter does not have mass or take up space.
Answer:
A
Explanation:
Matter is always anything that can take up space and in order for something you can touch (matter is tangible) It has to have mass.
13. What is the meaning of the word faint?
How many moles are in 5.34 x 10*21 particles of Nitrogen?
This person is fishing in a small, freshwater body of water. This body of water flows into a larger body of water called a river. What is this small body of freshwater called?
Answer:
Explanation:
The smallest body of water is the brook, a natural stream of water that is found aboveground and is often called a creek as well. A brook is usually a tributary (a small body of water that naturally flows into a large one) of a river, but this is not always the case.
Answer:
pond
Explanation:
An unknown element X has the following isotopes: 126X (22.00%
abundant), 128X (34.00% abundant), 130X (44.00% abundant). What is
the average atomic mass in amu of X?
Answer:
[tex]m_X=128.44 a.m.u[/tex]
Explanation:
Hello there!
In this case, since the average atomic mass of an element, when given the atomic mass and the percent abundance of the naturally occurring isotopes is computed as shown below for this unknown element:
[tex]m_X=126*0.22+128*0.34+130*0.44[/tex]
Whereas the atomic mass of each isotope is multiplied by the percent abundancy; we obtain:
[tex]m_X=128.44 a.m.u[/tex]
Best regards!
Considering the definition of atomic mass, isotopes and atomic mass of an element, the atomic mass of the element is 128.44 amu.
Definition of atomic massFirst of all, the atomic mass (A) is obtained by adding the number of protons and neutrons in a given nucleus of a chemical element.
Definition of isotopeThe same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.
Definition of atomic massOn the other hand, the atomic mass of an element is the weighted average mass of its natural isotopes. In other words, the atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.
Atomic mass of the element in this caseIn this case, you know:
the first isotope has an atomic mass of 126 amu and a percent natural abundance of 22%. the second isotope has an atomic mass of 128 amu and a percent natural abundance of 34%. the third isotope has an atomic mass of 130 amu and a percent natural abundance of 44%.Then, the average mass of lithium can be calculated as:
126 amu×0.22 + 128 amu×0.34 + 130 amu×0.44= 128.44 amu
Finally, the atomic mass of the element is 128.44 amu.
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In a chemical reaction, if one knows the mass of A, one could determine:
1) the mass of any other reactant and product
2) only the mass of B
3) only the mass of C
4) only the mass of A
If one knows the mass of A, they may calculate the mass of any other reactant and product in a chemical reaction.
How can the mass relationship in a chemical reaction be determined?Find out how many moles each reactant has. To identify which reactant is limiting, compare the mole ratios of the reactants with the ratio in the balanced chemical equation. Determine how many moles of the limiting reactant can be converted into the product.
When the mass of the limiting reactant is known, how does one calculate the mass of the product?Calculate the maximum number of moles of product that can be produced from the limiting reactant using mole ratios. Add the product's molar mass to the number of moles.
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PLEEAASSEE HELP ITS ALREADY WAY PAST DUE AND ILL GIVE BRAINLIEST
Which of the following would be the evidence of a physical change?
A. unexpected change in odor
B. change in state of matter
C. formation of bubbles
D.precipitate was formed
Answer:
A. unexpected change in odor
Explanation: Common physical changes include melting, change of size, volume, color, density, and crystal form. Example the classic baking soda and vinegar reaction provides evidence of a chemical change due to the formation of a gas and a temperature change.
How many neutrons does beryllium have?
Answer:
7
Explanation:
A valley or depression between continents
A. Ocean Ocean basin.
B. Divergent boundary
C. Transform boundary.
D. Convergent boundary
A valley or depression between continents is called Ocean basin. Therefore, the correct option is option A.
What is valley?A valley is indeed a long, low region that commonly runs between mountains or hills and has a river and stream that runs through one end to another. Most valleys are produced through long-term erosion of the ground surface by streams or rivers. Some valleys are produced by glacial ice erosion.
These glaciers may persist in valleys in mountainous areas or in polar regions. These glacially produced valleys could have been constructed or extended during ice periods at lower latitudes or elevations, but they are currently ice-free and populated by rivers or streams. A valley or depression between continents is called Ocean basin.
Therefore, the correct option is option A.
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The definitive difference between speed and velocity is the consideration of _____.
A. variation
B. Direction
C. angles,
Answer: direction
Explanation:
How many moles are in 74.8 grams of NaCl?
Answer:
1.28 mol NaCl
Explanation:
Find the mass of NaCl by adding the two elements atomic mass
Na: 22.99
Cl: 35.45
22.99+35.45=58.44 g
Now convert to moles
74.8 g / 58.44 g = 1.27994524298 mol
Which of the following is the best example of kinetic energy being transformed into potential energy?
A. water flowing into lake behind a dam
B. an avalanche sliding down a mountainside
C. wind pushing a sailboat through the water
D. a motorboat pulling a water skier across a lake
WHICH ONE IS IT?!
Answer:
The correct answer is A
Explanation:
That water stops moving once it gets to the dam and turns into potential energy
Calculate ΔGo if the equilibrium constant is 1.37 x 10-5
Explanation:
your answer willing be 8.7
a certain kind of light has a wavelength of 4.6 micrometers what is the frequency of this light and gigahertz? Use c= 2.998 × 10^8 m/s for the speed of light.
Answer:
6.52×10⁴ GHz
Explanation:
From the question given above, the following data were obtained:
Wavelength (λ) = 4.6 μm
Velocity of light (v) = 2.998×10⁸ m/s
Frequency (f) =?
Next we shall convert 4.6 μm to metre (m). This can be obtained as follow:
1 μm = 1×10¯⁶ m
Therefore,
4.6 μm = 4.6 μm × 1×10¯⁶ m / 1 μm
4.6 μm = 4.6×10¯⁶ m
Next, we shall determine frequency of the light. This can be obtained as follow:
Wavelength (λ) = 4.6×10¯⁶ m
Velocity of light (v) = 2.998×10⁸ m/s
Frequency (f) =?
v = λf
2.998×10⁸ = 4.6×10¯⁶ × f
Divide both side by 4.6×10¯⁶
f = 2.998×10⁸ / 4.6×10¯⁶
f = 6.52×10¹³ Hz
Finally, we shall convert 6.52×10¹³ Hz to gigahertz. This can be obtained as follow:
1 Hz = 1×10¯⁹ GHz
Therefore,
6.52×10¹³ Hz = 6.52×10¹³ Hz × 1×10¯⁹ GHz / 1Hz
6.52×10¹³ Hz = 6.52×10⁴ GHz
Thus, the frequency of the light is 6.52×10⁴ GHz
Write the chemical formula for the following structure. You can't write subscripts so just
do full size subscript numbers.
Answer:
H2O2
Explanation:
By numbering the atoms we know about that it’s Hydrogen Peroxide
Which statement describes an interaction between the biosphere and the atmosphere that is related to
photosynthesis?
• During photosynthesis, plant roots take in water from soil.
O During photosynthesis, plants take in carbon dioxide from the air.
O Through photosynthesis, energy stored in plants is released into the air.
O Through photosynthesis, energy stored in plants is transferred to humans who eat them
Answer:
O During photosynthesis, plants take in carbon dioxide from the air.
Answer: The answer is: During photosynthesis, plants take in carbon dioxide from the air.
Explanation: I have my ways ;>
please can someone describe this picture? helppp
Answer:
They are in a periodic table
Answer:
it is in periodic manner
Explanation:
I hope it will helps you
Which explains why many places on Earth experience four seasons each year rather than just
two?
A As Earth orbits around the Sun, the axis changes its amount of tilt, which causes a change in
the amount of sunlight reaching Earth.
B Eastern and western hemispheres each experience a different season when Earth is at each
position shown and when it is 14 and 34 around its orbit.
C Halfway between the positions shown, the amount of solar energy received is less than when
the axis is pointed toward the Sun, but more than when the axis is pointed away from the
Sun.
D When Earth is 14 and 3/4 around its orbit, the northern hemisphere points directly at the Sun.
Answer:
d is the right one I think
What causes radiation?
Answer:
It can come from unstable atoms that undergo radioactive decay, or it can be produced by machines. Radiation travels from its source in the form of energy waves or energized particles. There are different forms of radiation and they have different properties and effects
For the balanced equation shown below, how many moles of Al will react with 98.7 moles of CuSO4
Answer:
65.8 mol
Explanation:
Step 1: Write the balanced equation for the single displacement reaction
2 Al + 3 CuSO₄ → Al₂(SO₄)₃ + 3 Cu
Step 2: Establish the appropriate molar ratio
According to the balanced equation, the molar ratio of Al to CuSO₄ is 2:3.
Step 3: Calculate the number of moles of Al that will react with 98.7 moles of CuSO₄
98.7 mol CuSO₄ × 2 mol Al/3 mol CuSO₄ = 65.8 mol Al
The bear population in a national forest was monitored for ten years. The collected data for two winter months can be seen in the bar graph. Which statement would be a researcher observation from the data collected during the ten years?
Answer:
C. is the answer i did the test and it was right.
Answer:
is D
Explanation:
largest bear population Feb 2000
Where is the main asteroid belt in the solar system?
Answer:
It's between Jupiter and Mars.6. What is a solution an example of?
A) element
B) heterogeneous mixture
(C)compound
D) homogeneous mixture
Answer:
solution is a homogeneous mixture of two or more component
Answer:
B) heterogeneous mixture
Explanation:
Can someone please help me with this question?
es 3l por 0/0 (1234008×556098
what is the pH of pure water?
7 if not exposed to the environment
Answer:
(H20) is 7 at 25oC,
Explanation: hope this helps but when exposed to the carbon dioxide in the atmosphere this equilibrium results in a pH of approximately 5.2.
Calculate the number of grams of 3.24 x 10^22molecules of CH3(CH2)8(OH)2
8.68 g CH₃(CH₂)₈(OH)₂
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Using Dimensional AnalysisExplanation:Step 1: Define
3.24 × 10²² molecules CH₃(CH₂)₈(OH)₂
Step 2: Identify Conversions
Avogadro's Number
[PT] Molar Mass of C - 12.01 g/mol
[PT] Molar Mass of H - 1.01 g/mol
[PT] Molar Mass of O - 16.00 g/mol
Molar Mass of CH₃(CH₂)₈(OH)₂ - 12.01 + 3(1.01) + 8[12.01 + 2(1.01)] + 2[16.00 + 1.01] = 161.3 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 3.24 \cdot 10^{22} \ molecules \ CH_3(CH_2)_8(OH)_2(\frac{1 \ mol \ CH_3(CH_2)_8(OH)_2}{6.022 \cdot 10^{23} \ molecules \ CH_3(CH_2)_8(OH)_2}) \cdot (\frac{161.3 \ g \ CH_3(CH_2)_8(OH)_2}{1 \ mol \ CH_3(CH_2)_8(OH)_2})[/tex]Multiply/Divide: [tex]\displaystyle 8.67838 \ g \ CH_3(CH_2)_8(OH)_2[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
8.67838 g CH₃(CH₂)₈(OH)₂ ≈ 8.68 g CH₃(CH₂)₈(OH)₂
2. Which of the following diagrams accurately represents the use of gases in both cellular respiration
and photosynthesis?
CO
CO,
Cellular
respiration
Photosynthesis
Cellular
respiration
Photosynthesis
O
0
a.
c.
CO
Cellular
respiration
Cellular
respiration
Photosynthesis
CO,
(Photosynthesis
0
b.
d.
0
Answer:
In algae or any other photosynthetic organism, there is the internalization of carbon dioxide gas in the reaction with water in the presence of sunlight to produce sugar molecules and oxygen gas in the atmosphere. So, photosynthesis is the process that releases or produces oxygen gas.
In cellular respiration (aerobic) the product of photosynthesis, glucose molecules, and oxygen react to produce the energy and releases carbon dioxide and water as byproducts.
The given question is incomplete, it lacks the diagrams (choices), however, the correct choices are attached as image:
The diagrams accurately represent the use of gases in both cellular respiration and photosynthesis is - diagram d. (check image)
CELLULAR RESPIRATION:
is the process in which living organisms obtain energy (ATP) by breaking down food molecules in their cells. It combines glucose and oxygen to produce carbon dioxide (CO2) and water (H2O) as follows: C6H12O6 + 6O2 = 6CO2 + 6H2OPHOTOSYNTHESIS
is the process in which green plants manufacture their own food using energy from sunlight. It combines carbon dioxide (CO2) and water (H2O) to produce glucose and oxygen (O2) as follows:6CO2 + 6H2O = C6H12O6 + 6O2
Thus, The correct choice of the diagram is - diagram d.
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An athlete can run 4 m/s. How far can she run in 3 minutes?
Answer:
720
Explanation:
4 m/s
60 seconds
= 180 seconds
3 minutes
4 m/s
= 720 m/s
180 seconds
I’m stuck on number 2
What is the difference between a homogenous and a heterogeneous?
Answer:
Explanation:
A homogeneous mixture consists of one single phase while a heterogeneous mixture consists of two or more phases.