they are located between each of the atrium and ventricle to prevent blood from flowing backwards, what is it?
Prompt
Explain how plate tectonics have changed Earth's surface over time. Include the role of plate tectonics in the creation of landforms.
Answer: The theory of plate tectonics tells us that the earth's surface sits on plates that shift due to the built up pressure underneath. When the pressure gets too much, it has to escape somewhere so it goes to the edges of the plate and causes earthquakes. This in turn causes the surface to shift.
An ionic bond would form between which pairs of elements? atomic number 4 and atomic number 18 atomic number 7 and atomic number 8 atomic number 3 and atomic number 4 atomic number 8 and atomic number 12
Answer:
atomic number 8 and atomic number 12
Explanation:
atomic number 8 and atomic number 12 , element with the atomic number 8 is oxygen, and the element with atomic number 12 is Magnesium
Magnesium has low ionization energy, hence higher tendency to loose its two outermost electrons to form positive ion.
Oxygen has high electron affinity, hence higher tendency to accept or gain electrons to form negative ion.
The electronegativity difference between the element with atomic number 8 and element with atomic number 12 is greater for the formation of ionic bond
There are two types of chemical compound one is covalent compound and other is ionic compound, covalent compound formed by sharing of electron and ionic compound formed by complete transfer of electron. Therefore, the correct option is option C.
What is chemical Compound?
Chemical Compound is a combination of molecule, Molecule forms by combination of element and element forms by combination of atoms in fixed proportion.
An ionic compound is a metal and nonmetal combined compound. Ionic compound are very hard. They have high melting and boiling point because of strong ion bond.
atomic number 8 =oxygen
atomic number 12= Magnesium
Magnesium has a low ionization energy and so a greater proclivity to lose its two outermost electrons to create a positive ion. Because oxygen has a high electron affinity, it is more likely to accept or acquire electrons to create a negative ion.
Therefore, the correct option is option C.
To learn more about chemical compound, here:
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What is the energy (ATP) from cellular respiration used for? Select all that are
correct.
option 1: movement
2: none of these answers are correct
3:growth
4:development
Answer:
1. movement
3. growth
4. development
Explanation:
ATP provides a source of chemical energy that powers all cell functions.
Any process in the body that requires energy relies on the conversion of ATP to ADP and the associated release of chemical energy. Therefore, movement, growth, and development all use ATP to take place.
Extended networks of pi bonds can cause a delocalization of electrons. Explain how this occurs.
Electrons in pi bonds can spread over a group of atoms. This is what is meant by delocalization of a pi bonded network.
There are two kinds of bonds in chemistry, these are;
Sigma bondsPi bondsSigma bonds are formed by end to end overlap of atomic orbitals while pi bonds are formed by side by side overlap of atomic orbitals.
Sometimes, pi orbitals are well oriented in such a way that electrons are spread over the pi orbitals of several atoms. For instance, in benzene, there are six pi electrons that are spread over the six carbon atoms in benzene. This is what is meant by delocalization.
Delocalization can only occur when there is are conjugated double bond. This is why delocalization is common in many aromatic compounds. Some inorganic ions such as CO3^2- also have delocalized pi electrons.
Learn more: https://brainly.com/question/2286339
If 96.5 grams of gold has a volume of 5 cm, what is the density of gold?
An ion has an overall charge of -2. Its the nucleus is made up of 29 protons and 35 neutrons. How many electrons does the atom have?
Answer:
31 electrons.
Explanation:
Atoms initially have a neutral charge. So if this atom were neutral, it would have 29 electrons to balance out with the 29 protons. Protons are never added or removed. Since this atom has a -2 charge, that means it is an anion with 2 additional electrons. 29e- + 2e- = 31e-
why plastic do not rust
Answer:
it can't rust simply because it doesn't contain any iron or any of it's alloys. In fact, not even all metals rust.
Explanation:
The expression 6.020 x 10^23
Answer:
3
Explanation:
A cell is a system
True
False
Answer: True
Explanation:
Tissues perform functions that are specializations of the normal function of individual cells.
Answer:
true
Explanation:
Which family does this element belong to? It is a silvery-white, soft metal
that tarnishes rapidly in air and reacts with water, is a relatively soft metal
Alkali Metals
Alkaline Earth Metals
Halogens
Noble gases
Answer:
Alkali metals
hope it helps
plss
tell
the
ans
.............
Answer:
b option will be the answer because in b option the light rays are coming in the eyes and you will be able to see the thing written on the sheet of paper
i hope you got it if yes please mark it as brainliest
A student sets up an experiment to test the factors that affect the
solubility of sodium chloride. The student places 5.Og of sodium chloride in
four beakers containing 250 mL of water. The student places each beaker
on a different hot plate and heats them to the following temperatures:
Beaker A: 30°C, Beaker B: 40°C, Beaker C: 50°C, Beaker D: 60°C. In which
beaker would the sodium chloride dissolve at the fastest rate? *
Beaker A
Beaker B
Beaker C
Beaker D
Answer:
Beaker D
Explanation:
Since Sodium Chloride melting point is 1,474°F (801°C) the logical possible answer would be D: 60C.
In humans, having freckles is dominant over not having freckles. Andrew does not have freckles. What is his genotype for freckles? A) ff B) FF C) fF D) Ff
Answer:
A)ff
Explanation:
its A bc, how you would write a dominate trait for having freckles is FF and how you would write a ressive(cant spell that word sorry) trait for having freckles is ff. if Andrew does not have freckles then he is a ressive, ff. and also my teacher told me that u always write a dominate trait before a ressive trait unless u r doing a tri hybrid cross or something else.
Using dimensional analysis How many mg are there in 8.75 X 107 kilograms?
Conversion factors:
[1000 g = 1 Kg]
[1000 mg = 1 g]
Can you please show the work
Answer:
8.75×10¹³ mg
Explanation:
From the question given above, we obtained:
Mass (in Kg) = 8.75×10⁷ Kg
Mass (in mg) =?
Next, we shall convert 8.75×10⁷ Kg to grams (g). This can be obtained as follow:
1 Kg = 1000 g
Therefore,
8.75×10⁷ Kg = 8.75×10⁷ Kg × 1000 g/1 kg
8.75×10⁷ Kg = 8.75×10¹⁰ g
Therefore, 8.75×10⁷ Kg is equivalent to 8.75×10¹⁰ g.
Finally, we shall convert 8.75×10¹⁰ g to mg. This can be obtained as illustrated below:
1 g = 1000 mg
Therefore,
8.75×10¹⁰ g = 8.75×10¹⁰ g × 1000 mg/ 1 g
8.75×10¹⁰ g = 8.75×10¹³ mg
Thus, 8.75×10⁷ Kg is equivalent to 8.75×10¹³ mg.
wich organelle is found in photosynthesis organisims and caprures energy from the sun
Plastid is the organelle that can the substance. chlorophyll that performs photosynthesis
what frequency does television channel 7 broadcast at?
Answer:
Channel 7's frequency is 117.5 MHz
Answer:
174 MHz - 180 MHz w/ center frequency of 177 MHz
Explanation:
216 - 174 = 42
42/7 = 6
6 + 174 = 180 - 7 - 177 MHz
180 + 6 = 186 - 8 - 183 MHz
186 + 6 = 192 - 9 - 189 MHz
192 + 6 = 198 - 10 - 195 MHz
198 + 6 = 204 - 11 - 201 MHz
204 + 6 = 210 - 12 - 207 MHz
210 + 6 = 216 - 13 - 213 MHz
What properties of matter are the same for that substance no matter how much there is?
Answer:
physical properties
Explanation:
Intensive properties: A physical property that will be the same regardless of the amount of matter.
density: ρ=mv
color: The pigment or shade
conductivity: electricity to flow through the substance
malleability: if a substance can be flattened
luster: how shiny the substance looks
The factors in a experiment that do not change
Answer:
The answer is Constant.
What is one Scientific Law or Scientific Theory that affects our life?
Answer:
Does the Big Bang theory count?
If an element gives away an electron, will it form a positive ion or a negative
ion?
Answer:
posotive
Explanation:
electrons give off negative pulse so take one away
kinetic energy is energy that an object possesses because of its
Kinetic energy is the energy possessed by an object due to its motion. If an object is moving, then it has kinetic energy. If an object has kinetic energy, then it is moving. Many students confuse kinetic energy with potential energy.
carbon has 4 electrons in the outer shell .how does carbon attain stable electronic configuration!if ur answer it 21 points + i wil mark as brainlist so dont miss it
Answer:
through covalent bond
4. Which of the following
is an example of a
heterogeneous mixture?
a, tea
b. oxygen
c. pizza
d. water
Answer:
water
Explanation:
Answer:
c. pizza
Explanation:
Pizza is a heterogeneous mixture because it components are not uniform.
What are 2 mixtures
Air
Orange juice
Silver
Sodium chloride
Water
Which is most likely a molecule in a wall-filling material?
Answer:
C6H6
Explanation:
charge in the molecules of the wall material ,attracting and holding
at the bottom of the ocean a rock has a mass 25 g. At sea level the same rock wilk have a mass of:
less than 25 g
more than 25 g
exactly 25 g
Answer:
exactly 25 g
Explanation:
The mass of an object is universally the same every where. Even in outer space.
This is because, mass is the amount of matter contained in a substance. Since there is no loss in the amount of matter, the mass of the body stays the same.
It is weight that is subjected to changes with the value of gravity. Weight differs from places to places. A place with higher gravity will have a higher value of weight for any given mass.Mass accounts for every individual matter present in a substance.
When they remain the same, mass does not change. Only a change in the amount of matter in a body can cause variation in mass.
Therefore, at the bottom of the ocean, a body will have the same mass as on top and even at sea level.
Answer:
c. exactly 25 g
Explanation:
A cake recipe calls for 0.75 kg of butter. How many grams of butter would be needed for 4 cakes
Answer:
So if you divide the kg of butter and the cake that will be your answer and then you should have a fraction so the fraction would be 0.25 over 2 because you simplified it. 0.25/2
Explanation:
Question
Which two of these options does the transfer of light energy require?
A. Magnetic fields
B.Electric fields
C. Gravitational forces
D. Geometric figures
Answer: A,B
Explanation:
Answer: A. Magnetic fields
B. Electric fields
Explanation:
Hydrogen’s emission spectrum includes a line of violet light that has a frequency of 7.31 x 1014 Hz. What is the energy (in joules) a photon of the violet light?
Select one:
a. 4.85 x 1019 J
b. 1.10 x 10-48 J
c. 9.06 x 10-49 J
d. 4.84 x 10-19 J
Answer:
Option D. 4.85×10¯¹⁹ J
Explanation:
From the question given above, the following data were obtained:
Frequency (f) = 7.31×10¹⁴ Hz.
Energy (E) =?
The energy of the photon of violet light can be obtained by using the following formula
E = hf
Where:
E is the energy.
h is the Planck's constant
F is the frequency.
Frequency (f) = 7.31×10¹⁴ Hz.
Planck's constant (h) = 6.63×10¯³⁴ Js
Energy (E) =..?
E = hf
E = 6.63×10¯³⁴ × 7.31×10¹⁴ Hz.
E = 4.85×10¯¹⁹ J
Therefore, the energy of the photon of the violent light is 4.85×10¯¹⁹ J
