Which of the following is the BEST description of our atmosphere?
It dissolves meteors and protects us from ultraviolet radiation.
It’s made of a mixture of gases that protect Earth and help create conditions that allow life to live here.
It’s made of nitrogen and oxygen.
It contains a mixture of gases.
Answer:
I think the answer is B.
Answer:
B
Explanation:
Other things like A, C, and D are not the best explanation because they are all simple senteces.
In models of molecules, spheres of different colors and
sizes represent different types of atoms.
Which model shows a molecule of a substance that is made up of three
elements?
A
B
C
Or
D ?
Answer:
D
Explanation:
According to this question, each model of molecules in the options contains spheres of different colors and sizes representing different types of atoms. The atoms of the same element are the spheres of same color and size while atoms of different element are of different color or size.
Therefore, the model showing a molecule of a substance that is made up of three elements is model D because it is made up of three distinct spheres representing atoms of each element.
- The red sphere is the atom of the first element
- The big dark sphere is the atom of the second element
- The small white sphere is the atom of the third element
Answer:
D
Explanation:
What are the four main types of tissues in the human body?
epithelial
dermal
vascular
connective
muscle
nervous
Answer:
epithelium, muscle, connective tissue and nervous tissue.
Explanation:
Explanation:
Epithelial
Connective
Muscle
Nervous
in addition to Earthquake, hurricane, which of the following could be categorized as a "disaster" risk?
Answer:
I think its a World War.
Explanation:
This is just what my sister told me, since the cost for the war could make a country poor and the damage it could cause could lead a country to disaster.
i think d answer is tsunami
How would I create a Lewis dot structure with the compound: CHBr2Cl
Answer:
Step 1: Find the Total Number of Valence Electrons. ...
Step 2: Find the Number of Electrons Needed to Make the Atoms "Happy" ...
Step 3: Determine the Number of Bonds in the Molecule. ...
Step 4: Choose a Central Atom. ...
Step 5: Draw a Skeletal Structure. ...
Step 6: Place Electrons Around Outside Ato
Explanation:
What is the function of the esophagus?
The esophagus functions primarily as a transport tube that directs the progression of food and fluids from the mouth to the stomach.
Which element has an outer(ending) electron configuration of s2p4?
The question is in complete, the complete question is:
Which element has an outer electron configuration of s 2 p4 ?
(A) Ca (B) Cr (C) Ge (D) Se
Answer:
(D) Se
Explanation:
The outer electronic configuration of an atom reflects the group to which it belongs in the periodic table. Each group has its unique outermost electron configuration and number of electrons found in the outermost shell of the atoms of elements in the group.
s 2 p4 is the unique outermost electron configuration of group 16 elements. Group 16 elements have six electrons in their outermost shell. If we consider the options, only Se is a member of group 16. Hence it is only Se that has the outermost electron configuration s 2 p4 .
An element which has an outer (ending) electron configuration of [tex]s^2p^4[/tex] is: Oxygen.
Electron configuration can be defined as a formula that is used to denote the distribution of the atoms of a chemical element in an atomic orbital.
Basically, electron configuration uses four (4) main letters to illustrate the distribution of atoms in an atomic orbital:
spdfThe electron configuration of [tex]s^2p^4[/tex] indicates that the chemical element is in Group 6 and has six (6) electrons in its outermost shell.
Hence, a chemical element such as Oxygen (O) or Selenium (Sn) in Group 6 of the periodic table would have an electron configuration of [tex]s^2p^4[/tex].
Read more: https://brainly.com/question/18214726
When an atom is trying to obtain stability, what part(s) of the atom change(s)?
At what time was the frog sitting still or at rest
Answer:
What are the times and is that your question?
Explanation:
Sanjay is learning about the elements that make up Earth’s crust. Ms. Richards, his Earth science teacher, gives him an element and asks him to determine which element from Earth’s crust it is. She also provides Sanjay with this table. Sanjay weighs the element and finds that it has a mass of 17.98 g. By placing the element in water, he determines the volume of the substance to be 2.2835 mL.
Based on the table from Ms. Richards, what element from Earth’s crust did Ms. Richards gave to Sanjay?
A) iron
B) calcium
C) aluminum
D) silicon
Answer:
Iron
Hope this helps! Stay safe!
(Plz vote me as brainliest)
Answer:iron
Explanation:
The process during which a substance changes from a solid directly to a gas without becoming a liquid is known as: Example(dry ice)
A)
condensation.
B)
fusion.
C)
melting.
D)
sublimation.
if two successive terms of the fibonacci sequence are both odd, is the next term is even or odd? why?
Answer:
Even because you always add the previous two terms in the sequence. Since they are both odd, the next term will be even. (odd+odd = even)
Explanation:
18. Which two particle diagrams each represent a sample of one substance? Key O = atom of oxygen = atom of hydrogen 0 = atom of chlorine 8 OO 1 நம் மும் 20 2000 (1) I and III (3) II and IV (2) II and III (4) I and II
Answer:
1 and 11
Explanation:
Answer:1 and 11
Explanation:
Need help ASAP..... (0.567 liters of H2O is how many moles of H2O? HINT: 1 mL H20 = 1 gram
H20)
Answer:
31.5 moles
Explanation:
Volume of H2O = 0.567 L
Number of mole of H2O =.?
Next, we shall convert 0.567 L to millilitres (mL). This can be obtained as follow:
1 L = 1000 mL
Therefore,
0.567 L = 0.567 L × 1000 mL / 1 L
0.567 L = 567 mL
Thus, 0.567 L is equivalent to 567 mL.
Next, we shall convert 567 mL to grams (g). This can be obtained as follow:
1 mL of H2O = 1 g
Therefore
567 mL of H2O = 567 g of H2O
Finally, we shall determine the number of mole in 567 g of H2O. This can be obtained as follow:
Mass of H2O = 567 g
Molar mass of H2O = (2×1) + 16
= 2 + 16 = 18 g/mol
Mole of H2O =?
Mole = mass /Molar mass
Mole of H2O = 567 /18
Mole of H2O = 31.5 moles
A sample is left on the desk over several hours. On examination, the crystals appear moist, andliquid is forming around them. The compound is classified as:
a. Stableb.
b. Deliquescent
c. Efflorescentd.
d. Hygroscopic
Answer:
c. Efflorescent
Explanation:
Some hydrated salts, when exposed to the atmosphere, give off part of all of their water of crystallization spontaneously to form a lower dehydrated or anhydrous salt. Such salts are known as efflorescent and the phenomenon is called Efflorescence.
Efflorescence occurs when the hydrate's aqueous vapor pressure is greater than the water vapor's partial pressure in the air. For example, because the vapor pressures of washing soda (Na2CO3·10H2O) and Glauber's salt (Na2SO4·10H2O) normally exceed that of the water vapor in the atmosphere, these salts effloresce (i.e., lose all or part of their water of hydration), and their surfaces assume a powdery appearance.
what is the hybridization of NO2
Answer: Explanation:
If we apply the hybridization rule then it states that if the sum of the number of sigma bonds, lone pair of electrons and odd electrons is equal to three then the hybridization is sp2.
List the factors that cause low oxygen levels.
Answer:
Common causes of hypoxemia include:
Anemia.
ARDS (Acute respiratory distress syndrome)
Asthma.
Congenital heart defects in children.
Congenital heart disease in adults.
COPD (chronic obstructive pulmonary disease) exacerbation — worsening of symptoms.
Emphysema.
Interstitial lung disease
and many more.....
The purpose for witch something is designed or exists
Answer:
to help
Explanation:
to help
what is the name of CH3CH2CH2C(O)CH2CH3
Answer:
1-methoxypropane
Explanation:
Radio waves are examples of electromagnetic waves. T or F
Answer:
the answer is true
Explanation:
Predict: Note the type of reaction you expect for the reactants Kl and Pb(NO3)2
Answer:
double replacement
Explanation:
just did it
Answer:
Double replacement
Explanation:
Why can stars be called element factories?
Answer:
They came from the element factories we call stars. Stars are mostly hydrogen throughout most of their lifespans. They are driven by massive and continuous thermonuclear reactions and gravity. ... This extra heat begins to fuse helium atoms into heavier elements like carbon and oxygen and gives new life to the star.
Explanation:
What would be the temperature as well as pressure inside and outside of a can if it were to be placed in cold water?
Answer:
The hot gas molecules are the same pressure as the air outside the can. When the can is placed in cold water upside down, the hot gas water molecules are cooled very rapidly. ... Since the air pressure outside the can is stronger than that inside the can, it causes the can to collapse.
Explanation:
Which phrase is not an example of intercellular communication?
A chemical messengers dock onto receptors of adrenal gland
B chemical signal from pituitary gland to adrenal gland
C electrical signals pass between heart cells
D a vesicle encloses over a nutrient molecule
Answer: The answer is D
Explanation: I took the quiz just now and got it right
The correct answer is:
D.(a vesicle encloses over a nutrient molecule)
I took the test, hope this helps!
illustrate the respiratory system
I hope this has the information that you need
A solution that holds more solute than it normally can under the conditions at a given temperature is _____. supersaturated unsaturated saturated diluted
Answer:
Supersaturated !
Explanation:
What does the name "atom" mean in
Greek?
It means indivisible
Answer:
The Greek root of atom is atomos, which means "indivisible," since the scientists who first gave the atom its name imagined it couldn't be split or divided into smaller pieces.
Explanation:
Rank lead, phosphorus, and barium in order of increasing ionization energy.
A) Pb < P < Ba
B) Ba < P < Pb
C) Pb < Ba < P
D) Ba < Pb < P
Answer:
D) Ba < Pb < P
Explanation:
Barium (Ba): 5,2117
Lead (Pb): 7,4167
Phosphorus (P): 10,4867
Increasing order of ionization energy:
Ba < Pb < P
Electronic configurations of given elementsPb: [Xe] 6s² 4f¹⁴ 5d¹⁰ 6p²
P: [Ne] 3s² 3p³
Ba: [Xe] 6s²
All the given elements have stable half-filled subshells. But phosphorus has the smallest atomic size among them, so it will have the lowest tendency to remove an electron from its valence shell and hence will require the highest amount of ionization energy. Barium has a higher atomic size than lead, therefore it has lower ionization energy than lead.How are ionization energy and atomic size related?The force of attraction is stronger when the electron is closer to the nucleus, and as a result, more energy is needed to overcome this attraction and remove the electron.Therefore, the ionization energy increases with decreasing radius and vice versa.Learn more about trends of ionization energy here:
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Pls help I dont get science so pls help me
The phase of matter most likely to be present at absolute zero would be:
A)
plasma
B)
gas
C)
liquid
D)
solid
Answer:
D solid
Explanation: