Answer:
Morphology and phylogenetics revealed by fossils. Perhaps the strongest evidence to support the Cambrian evolutionary explosion of animal forms is the first clear appearance, in the Early Cambrian, of skeletal fossils representing members of many marine bilaterian animal phyla
Explanation:
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Molecules that are too large to flow across the
membrane need help from what structures?
Answer:
Some molecules, such as carbon dioxide and oxygen, can diffuse across the plasma membrane directly, but others need help to cross its hydrophobic core. In facilitated diffusion, molecules diffuse across the plasma membrane with assistance from membrane proteins, such as channels and carriers.
Molecules that are too large to flow across the membrane need help from integral proteins.
Some molecules are too large to diffuse through the membrane channels and too lipid insoluble to diffuse through the phospholipid layer.
Such is the case with glucose and some other monosaccharides,these substances, however, can cross the plasma membrane through the facilitated diffusion process.
The transport of these molecules depends on integral membrane proteins that act as transporters, transferring the molecules to one side of the membrane and the other without coming into contact with its hydrophobic interior.
Intrinsic or integral proteins constitute more than 70% of the total and are totally or partially included within the lipid matrix of the membrane maintained by hydrophobic interactions.
When they are arranged along the membrane, they are called transmembrane, they can pass totally or partially through the bilayer, sticking out one or both of its surfaces.
There are pores and channels in the membrane to pass substances to the interior and exterior of the cells formed by transmembrane proteins.
The passage of ions through ion channels is faster than through "carrier" proteins, since it does not require the union of the ion with the pore protein.
Therefore, we can conclude that molecules that are too large to flow across the membrane need help from integral proteins.
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Match each organ with the correct organ system.
1. small intestine
skeletal system
2. blood vessels
cardiovascular system
3. lungs
respiratory system
4. tricep
digestive system
5. spine
muscular system
Answer:
1. small intestine: digestive system
2. blood vessels: cardiovascular system
3. lungs: respiratory system
4. tricep: muscular system
5. spine: skeletal system
Answer:
1. small intestine: digestive system
2. blood vessels: cardiovascular system
3. lungs: respiratory system
4. tricep: muscular system
5. spine: skeletal system
Explanation:
HELP ME!!!!
Which item in Figure 1 expanded the least when heated?
steel
oak
aluminum
glass
Answer:
glass your welcome
Explanation:
Na2NO₃ → Na2 NO2 + O2
Answer:
4NO2 + 2Na2O + O2 → 4NaNO3
What element has 7 valence electrons on it's 5th energy level?
Answer:
Chlorine has 7 valence shell electrons, 2 in the 3s orbital and 5 in the 3p orbital. Since a full shell of valence electrons (8) is the most stable configuration, chlorine tends not to lose electrons but to gain one electron to fill the final 3p orbital and give it 8 valence electrons like its neighboring noble gas argon
Explanation:
i hope this helped
Two or more than two atoms with different physical or chemical properties can not combine together to form an element. The element which has 7 valence electrons on it's 5th energy level is Iodine.
What is element?Element generally consist of atoms or we can atoms combine to form element. Atoms of an element is always same, means all the properties of all atoms of one type of element is same.
Valence shell is the last shell to which electrons are being filled. Since 7 valence electron are present in 5th shell of the element. So, we know that in whole periodic table group 17 or halogen family contains 7 electrons in its valence shell. 5th energy represents the number of period. So, the given element is Iodine.
The electronic configuration of Iodine is
[Kr] 4d¹⁰ 5s² 5p⁵
Therefore, the element which has 7 valence electrons on it's 5th energy level is Iodine.
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I need help on this question really bad
Answer:
Fungi, or D
Explanation:
How many liters will 5.00 moles of oxygen occupy at STP?
Answer:
1 mole of any gas at STP occupies 22.4 liters of volume. Using this information, the volume occupied by any number of moles (or grams) can be determined.
Explanation:
There will be 22.4 liters of oxygen, which will be 5.00 moles of oxygen occupied at STP.
What are moles?The International System of Units uses the mole (symbol: mol) as the unit of material quantity. How many elementary entities of a particular substance are present in an object or sample is determined by the quantity of that material.
The chemical element with the atomic number 8 and symbol O is called oxygen. It belongs to the periodic table's chalcogen group, is a very reactive nonmetal, and is an oxidizing agent that easily produces oxides with most elements as well as other compounds.
1 mole of any gas at STP occupies 22.4 liters of volume. Using this information, the volume occupied by any number of moles (or grams) can be determined.
Therefore, at STP, 5.00 moles of the available 22.4 liters of oxygen will be occupied.
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After the completion of a gas forming reaction, the column of water remaining in the collection flask was measured to me 55mm high, the vapor pressure of water is 0.0313atm at 25oC, and the atmospheric pressure that day was measured as 0.950 atm, what is the partial pressure of the gas produced by the reaction? 1mmHg=13.595mm H2O and 1atm=760mmHg (see sample calculation found in prelab slides.)
Answer:
Partial pressure of gas = 0.913 mmHg
Explanation:
Since the column of water in the tube is higher than in the container, it means that the atmospheric pressure is greater than the gas pressure.
Also, since the gas is collected over water, the total gas pressure is due to partial pressure of the gas and the partial pressure of water vapor, i.e.,
Hence, Partial pressure of gas = Patm - Pressure due to height of water column - Partial pressure of water
Pressure due to height of water column = 55 mmH₂O
Since 13.595 mmH₂O = 1 mmHg
55 mmH₂O = 55/13.595 mmHg
Converting to 55/13.595 mmHg to atm
Pressure due to height of water column = (55/13.595 mmHg) * (1 atm/760 mmHg) = 0.00532
Partial pressure of gas = (0.950 - 0.00532 - 0.0313) atm
Partial pressure of gas = 0.913 mmHg
i need help so what would you do if you have a boyfriend that lives an hour and 8 minutes away from you and its been almost 3 months and you love him but it hurts that you cant see him, then a guy you liked for over a year told you he likes you back and would give you the relationship you've always wanted in person....who would you pick
Answer:
Probably the one you are already dating...
Explanation:
...but if you really like the other guy then you should chose him.
In the Galapagos Islands, finches on different islands have beaks of different shapes, which help them gather the food that grows on the island where they live. The different types of beaks are what kind of adaptation?
A. structural adaptation
B. seasonal adaptation
C. behavioral adaptation
D. environmental adaptation
Answer:
A. structural adaptation
Explanation:
Hope This Helps!!
God Bless!!
~DuffyDuck~
Only smart people are allowed to answer ONLY smart people............... If you can answer this correctly then maybe you are actually yourself!!!
Fill in the blanks: ______ compounds break up into ______ and ______ in solution, which can move freely and carry an _______ current.
Answer:
Fill in the blanks: IONIC compounds break up into ANIONS and CATION in solution, which can move freely and carry an ELECTRICAL current.
definition of conduct (in physics)
Answer:
transitive physicsif something conducts heat or electricity, heat or electricity can move through it.
Explanation:
Hello good afternoon...God bless here is the answer to your following question-
definition of conduct (in physics)- transitive physics if something conducts heat or electricity, heat or electricity can move through it.
For the most effective hot pack, should the Temperature change be positive or negative ?
Answer:
Positive
Explanation:
For the most effective hot pack, the temperature change should be positive.
Hot packs are generally utilized for their heat-producing abilities. Hence, the reactions leading to the activation of hot packs are usually exothermic, that is, heat energy generating. In other words, positive or increased temperatures must be generated when hot packs are activated.
This is unlike cold packs which are utilized for the cold-generating abilities. Reactions leading to their activations must be endothermic, that is, heat-absorbing.
Which molecule will provide the greatest amount of energy to a living cell
(1) water
(2) oxygen
(4) carbon dioxide
organic compounds in nood
(3) sugar
Answer: oxygen
Explanation: because we need it to live ;)
Answer:
(2) oxygen
Explanation:
how many sig figs are in the measurment 10010m
Answer:
5
Explanation:
They all matter unless it is a decimal.
20 POINTS 7th garde science
Answer:
a
Explanation:
because look at the pic of the flower
Answer:
a
Explanation:
What is the Lewis dot diagram structure for PI2F
Answer:
Please find attached the completed Lewis dot diagram structure for PI₂F
Explanation:
The number of valence electrons are;
Phosphorus = 5 Electrons
Iodine = 2 × 7 electrons = 14 electrons
Chlorine = 7 electrons
The total number of valence electrons = 14 + 7 + 5 = 26 electrons
2) We draw the symbol that represents the basic (general) structure of the molecule as follows;
The sheared electron pair are represented by single bond lines
3) We complete the octet structures round the fluorine and the iodine atoms as attached showing 18 electrons plus 6 shared electron pairs, with a maximum from step 2 to give a total of (18 + 6) 24 electron pairs
4) We add the 2 unaccounted valence electron on the phosphorus atom to give it the stable octet structure, which gives the completed Lewis structure
MATCH the sub-atomic particles with their descriptions.
Neutron
Electron
Quark
Proton
A. Smallest theoretical particles of protons and neutrons
B. + charge; located in the nucleus
C. no charge; located in the nucleus
D. - charge; located outside the nucleus
Explanation:
Neutron - no charge, located in the nucleus.
electron - - charge, located outside the nucleus.
Quark- smallest theoretical particles of protons and neutrons.
proton- + charge, located in the nucleus.
a- If an Lithium (atomic number 3) atom has a -2 charge, how many electrons does it have? b- Why do you do it this way? c- Is this an anion or a cation? d- Why? (4 points)
Answer:
5
Explanation:
A lithium atom with an atomic number of 3 and a charge of -2 will have a total number of electrons.
The atomic number is the number of protons in an atom. For a neutral atom that has not gained or lost electrons, the atomic number is the same as the number of electrons.
neutral atom: atomic number of electrons
For neutral atom of lithium, we will have 3 electrons
Now, lithium with a charge of -2 has gained two more electrons to the original 3 this now makes it 5.
ii.
It is an anion because it is negatively charged.
Negatively charged particles are called anion.
How is covalent bonding typically explained?
Answer: Covalent bonding occurs when pairs of electrons are shared by atoms. Atoms will covalently bond with other atoms in order to gain more stability, which is gained by forming a full electron shell.
Explanation: I hope that helped and Happy friday.
If a 750.0 gram sample of water is cooled for 95.0 oC to 17 oC, how much heat is released? CP = 4.18 J/g oC
Answer:
Heat, Q = 262 kJ
Explanation:
Given that,
Mass of a sample, m = 750 g
Initial temperature, [tex]T_i=95^0\ C[/tex]
Final temperature, [tex]T_f=17^0\ C[/tex]
The specific heat of the sample, [tex]c=4.18\ J/g^0 C[/tex]
We need to find the amount of heat released. The amount of heat released is given by the formula as follows :
[tex]Q=mc\Delta T\\\\Q=750\times 4.48\times (17-95)\\\\Q=-262080\ J\\\\Q=-262\ kJ[/tex]
So, 262 kJ of heat is released by the sample.
Q2 Write the following measurements in scientific notation using the concept of significant figures.
i) 0.000758 g
j) 4,573,000 m
k) 0.03438 mg
h) 5,000 km
Answer:
Explanation:
i = 7.58 × 10 to the -4 power
j = 4.573 × 10 to the sixth power
k = 3.438 × 10 to the -2 power
h = 5 × 10 to the third power
hope this helps!
(ii) Electrons are supplied to the external circuit. How and where is this done?
[2]
Answer:
The electrons are supplied by the species getting oxidized. They move from anode to the cathode in the external circuit. The external battery supplies the electrons. They enter through the cathode and come out through the anode
The electrons are supplied by the species getting oxidized. They move from the anode to the cathode in the external circuit.
What are electrons?An electron is a negatively charged subatomic particle.
The reaction at the anode is oxidation and that at the cathode is reduction. Here, the anode is positive and the cathode is the negative electrode. The reaction at the anode is oxidation and that at the cathode is reduction.
The electrons are supplied by the species getting oxidized. They move from the anode to the cathode in the external circuit. The external battery supplies the electrons. They enter through the cathode and come out through the anode.
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relationship between genes chromosomes an dna .
Answer:
Genes are segments of DNA that contain the code for a paticular protein that works in one or more types of cells in the body. Chromosomes are structures within cells that contain a person's genes. Genes are contained in chromosomes, which are in the cell nucleus.
Explanation:
Answer:
The answer should be A
Explanation:
What is meaning of mebolism
Answer:
I think you meant metabolism
Explanation:
me·tab·o·lism
the chemical processes that occur within a living organism in order to maintain life.
Answer: I’m guessing you meant metabolism. Metabolism is the chemical reactions in the body's cells that change food into energy. Our bodies need this energy to do everything from moving to thinking to growing. Specific proteins in the body control the chemical reactions of metabolism.
Help please?? I’m confused
Oh really
How do I look evil, right? Egypt made me brown
Answer:
ummmmmmmmmmmmmmmmmmmmmmmm
Answer:
????????????
Explanation:
ummmmmmmmm
In Universe L , recently discovered by an intrepid team of chemists who also happen to have studied interdimensional travel, quantum mechanics works just as it does in our universe, except that there are four d orbitals instead of the usual number we observe here. Use these facts to write the ground-state electron configurations of the third and fourth elements in the first transition series in Universe L .Note: you may use X to stand for the electron configuration of the noble gas at the end of the row before the first transition series.
Answer:
See explanation
Explanation:
The third and fourth elements in the first transition series are vanadium and chromium. They contain 23 and 24 electrons respectively.
In universe L, the electron configuration of vanadium is;
[X] 3d3 4s2
In universe L, the electron configuration of chromium is;
[X] 3d4 4s2
The electron configuration of chromium has to change since there are four instead of five d orbitals in universe L.
What is the warmest layer of the atmosphere?
Answer:
Explanation:
The thermosphere is often considered the "hot layer" because it contains the warmest temperatures in the atmosphere. Temperature increases with height until the estimated top of the thermosphere at 500 km. Temperatures can reach as high as 2000 K or 1727 ºC in this layer (Wallace and Hobbs 24).
Which of the following is a true statement?
А
Periods form horizontal rows; groups form vertical columns
B Groups form horizontal rows; periods form vertical
C Categories form horizontal rows; gases form vertical
D
Gases form horizontal rows; categories form vertical
columns
Answer:
A
Explanation:
learned this in biology
