Monomers are generally small molecules that make up a long polymeric chain. The monomer for lipids is triglycerides.
What are triglycerides?A triglyceride is an ester consisting of three fatty acids and glycerol. Triglycerides are the main components of human body fat.
Lipids are made up of long chains of triglycerides.
Thus, the correct option is B.
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Sunspots appear dark because they are what ?
Sunspots appear dark because they are cooler than the surrounding areas of the sun's surface. The cooler temperature causes less light to be emitted, making the sunspots look dark.
Explanation:Sunspots appear dark because they are cooler than the surrounding areas of the sun's surface, also known as the photosphere. While they are still very hot, sunspots have temperatures of about 3,000 to 4,500 Kelvin, which is cooler than the average temperature of the photosphere, which is about 5,500 Kelvin. This difference in temperature causes less light to be emitted, and therefore the sunspots appear dark compared to the rest of the sun's surface
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Copper crystallizes in a face centered cubic lattice. if the edge of the unit cell is 351 pm what is the radius of the copper atom
Final answer:
The atomic radius of a copper atom in a face-centered cubic lattice with an edge length of 351 pm is approximately 123.675 pm.
Explanation:
Calculating the Atomic Radius in a Face-Centered Cubic Lattice
For copper, which crystallizes in a face-centered cubic (FCC) lattice structure, we can calculate the atomic radius if we know the edge length of its unit cell. Given that the edge of the FCC unit cell is 351 pm, we can use the fact that the diagonal across the faces of the cube (√2 times the edge length) is equal to four times the atomic radius in an FCC lattice. This is because in an FCC structure, atoms touch along the face diagonal.
To calculate the atomic radius, we use the formula:
4r = √2 × edge length
Therefore: r = (√2 × 351 pm) / 4
r ≈ (1.414 × 351 pm) / 4
r ≈ 494.7 pm / 4
r ≈ 123.675 pm
The approximate radius of a copper atom in an FCC lattice is 123.675 pm.
Jeremy throws his ball up in the air, but the ball falls back to the ground. What force made the ball move without ever touching the ball?
Answer:
the naswer is gravity pulling on the ball
Explanation:
What mass of argon occupies 4.3 l at 70 kpa and 20 c?
To find the mass of argon gas at 4.3 liters, 70 kPa, and 20 °C, use the ideal gas law, convert units to atm and Kelvin, solve for moles, and then multiply by the molar mass of argon to obtain the mass, which is approximately 4.07 grams.
Explanation:The question asks for the mass of argon gas that occupies a volume of 4.3 liters at a pressure of 70 kPa and a temperature of 20 °C. To answer this, we can use the ideal gas law equation, PV = nRT, where P is the pressure, V is the volume, n is the number of moles, R is the ideal gas constant, and T is the temperature in Kelvin.
First, we convert the given temperature to Kelvin:
Next, we need to convert the pressure from kPa to atm, since the ideal gas constant (R) is typically given in L·atm/(mol·K):
We can then rearrange the ideal gas law to solve for the number of moles (n):
Using the values and R = 0.0821 L·atm/(mol·K), we calculate n:
Finally, using the molar mass of argon, which is about 39.948 g/mol, we find the mass:
Therefore, the mass of argon that occupies a volume of 4.3 liters at 70 kPa and 20 °C is approximately 4.07 grams.
Use the changes in oxidation numbers to identify which atoms are oxidized and which are reduced in each reaction.
Final answer:
By assigning oxidation numbers, it is determined that Sr and O in H₂O are oxidized, while S in SO₃ and Kr are reduced in the given reactions. This identifies the substances undergoing oxidation and reduction.
Explanation:
To identify what is being oxidized and what is being reduced in each redox reaction, we first assign oxidation numbers to each atom in the reaction. The element whose oxidation number increases is oxidized, acting as the reducing agent. Conversely, the element whose oxidation number decreases is reduced, acting as the oxidizing agent.
Sr + SO₃ → SrSO₃: Sr goes from 0 to +2 (oxidized), and S in SO₃ goes from +4 to +6 (reduced).2KrF₂ + 2H₂O → 2Kr + 4HF + O₂: Kr goes from +2 to 0 (reduced), O in H₂O goes from -2 to 0 (oxidized).SO₃ + SCl₂ → SOCl₂ + SO₂: S in SO₃ goes from +6 to +4 in SO₂ (reduced), Cl in SCl₂ goes from +1 to -1 in SOCl₂ (oxidized).By tracking these changes in oxidation numbers, we can easily determine which substances are oxidized and which are reduced in these reactions. Remember, the oxidized substance loses electrons, and the reduced one gains electrons, according to the concept of redox reactions.
What volume of 0.205 m k3po4 solution is necessary to completely react with 130 ml of 0.0116 m nicl2?
Hydrocarbons are chain-like or ring-like molecules made of carbon and ________ atoms.
The practice of concluding "do not reject h0" is preferred over "accept h0" when we
How much ammonia (nh3) is produced from two moles of nitrogen gas? 3h2 + n2 --> 2nh3?
A ping pong ball with a dent in it can be put into a pan of boiling water. After a short amount of time, the dent will pop out. Explain why this occurs.
Answer:
The right option is; b. the water caused an increase in temperature of the air inside the ball and an increase in pressure.
The dent (hollow area formed by pressing or hitting) from the ping-pong ball disappeared because energy was transferred from the hot boiling water in which the ball was placed to the air inside the ball. This transferred energy will increase the temperature of the air inside the ball and the air molecules will begin to move faster with a greater force. Hence, causing an increase in pressure.
Explanation:
What type of information can one obtain by taking a mass spectrum of an organic molecule like dodecane?
How many ml of 0.112 M Pb(NO3)2 are needed to completely react with 10.0ml of a 0.105 M KI Given Pb(NO3)2 (aq) + 2KI(aq)=2KNO3(aq)?
Answer : The volume of [tex]Pb(NO_3)_2[/tex] needed are, 4.6875 ml
Explanation :
First we have to calculate the moles of [tex]KI[/tex].
[tex]\text{Moles of }KI=\text{Molarity of }KI\times \text{Volume of solution}=0.105mole/L\times 0.01L=0.00105mole[/tex]
Now we have to calculate the moles of [tex]Pb(NO_3)_2[/tex]
The given balanced chemical reaction is,
[tex]Pb(NO_3)_2(aq)+2KI(aq)\rightarrow 2KNO_3(aq)+PbI_2[/tex]
From the balanced chemical reaction, we conclude that
As, 2 moles of KI react with 1 mole of [tex]Pb(NO_3)_2[/tex]
So, 0.00105 moles of KI react with [tex]\frac{0.00105}{2}=0.000525[/tex] mole of [tex]Pb(NO_3)_2[/tex]
Now we have to calculate the volume of [tex]Pb(NO_3)_2[/tex]
[tex]\text{Volume of }Pb(NO_3)_2=\frac{\text{Moles of }Pb(NO_3)_2}{\text{Molarity of }Pb(NO_3)_2}[/tex]
[tex]\text{Volume of }Pb(NO_3)_2=\frac{0.000525mole}{0.112mole/L}=4.6875\times 10^{-3}L=4.6875ml[/tex]
conversion used : (1 L = 1000 ml)
Therefore, the volume of [tex]Pb(NO_3)_2[/tex] needed are, 4.6875 ml
Ch of these three gases is most abundant in the atmosphere? which of these three gases is most abundant in the atmosphere? carbon dioxide (co2) nitrous oxide (n2o) methane (ch
Answer is Carbon dioxide.
The given gases are trace gases. Our atmosphere
has 0.1% of trace gases. Among those trace gases, carbon dioxide level is
highest as 93.49%. Methane has 0.44% and amount of nitrous oxide is 0.07%. But
when considering the whole atmosphere nitrogen gas is the most abundant gas as
78% and next is oxygen as 21%.
Carbon dioxide is the most abundant of the three gases mentioned in the Earth's atmosphere. Nitrogen and oxygen are the most abundant gases overall. Methane is more effective on a per-molecule basis at heating the atmosphere than carbon dioxide.
The question involves identifying which of the three gases carbon dioxide ([tex]CO_2[/tex]), nitrous oxide ([tex]N_2O[/tex]), or methane ([tex]CH_4[/tex]) is most abundant in the Earth's atmosphere. When considering these gases specifically, carbon dioxide is the most abundant. However, it is important to note that the major components of the atmosphere are nitrogen (78.1%) and oxygen (20.9%), with gases such as argon, carbon dioxide, neon, helium, methane, and nitrous oxide present in much smaller amounts.
Regarding the effectiveness at heating the atmosphere, methane is more effective on a per-molecule basis than carbon dioxide due to its ability to absorb more heat. However, carbon dioxide is more abundant and also contributes significantly to the atmospheric warming, playing a crucial role in the Earth's greenhouse effect beside water vapor, the most abundant greenhouse gas.
Which best explains how elements combine in different ways to produce compounds?
Elements combine in different ways to form compounds through chemical reactions, where bonds are formed holding the atoms together. The ratio of atoms in a compound is always a fixed, small, whole number, as per Dalton's atomic theory. Examples include water (H2O) and table salt (NaCl).
Explanation:Elements combine in different ways to produce compounds through a chemical reaction, which results in the formation of chemical bonds. For general reference, a compound is formed when two or more elements chemically combine, exhibiting definite chemical and physical properties distinct from its independent elements. Chemical bonds, namely ionic or covalent, hold the atoms together in a compound.
Take water as an example, it is a compound formed when two hydrogen atoms react with one oxygen atom, creating a molecule of water (H2O). In this compound, the ratio of hydrogen to oxygen atoms is 2:1, thus, presenting a clear demonstration of how elements combine in various ratios to create compounds with unique properties.
Another example can be the combination of sodium and chlorine to form table salt (NaCl). Here, one atom of sodium combines with one atom of chlorine. These examples manifest Dalton's atomic theory which elucidates that atoms of different elements can combine in fixed, small, whole-number ratios to form compounds.
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The way elements combine to produce compounds is best explained by chemical reactivity. Therefore, the correct answer is option a. chemical reactivity.
To understand which option best explains how elements combine in different ways to produce compounds, let’s look at each choice:
a. Chemical reactivity: This describes how readily an element reacts with other elements to form compounds, based on their electron configurations.b. State of matter: This refers to whether an element is a solid, liquid, or gas at room temperature, which does not directly affect how elements combine chemically.c. Similar physical properties: Elements with similar physical properties do not necessarily form compounds together.d. Matching atomic numbers: Atomic number defines an element and does not affect how different elements combine to form compounds.Therefore, chemical reactivity, best explains how elements combine in different ways to produce compounds. This is because elements combine based on their electron configurations and how their atoms interact to form stable molecules.
complete question.
Which best explains how elements combine in different ways to produce compounds?
a. chemical reactivity
b. state of matter
c. similar physical properties
d. matching atomic numbers
Whats the point of love?
All animals want to survive. With this in mind, lets talk about some natural drugs that your body creates to create this feeling of "love".
P.E.A. is a natural anti-depressant that the body makes, kind of like dopamine. This is the most affiliated with the nickname "love drug". It creates the need to reproduce sexually. This is the primal instinct; to reproduce and pass on your genetic material.
Now, as you stay with one partner, you may find that the feeling changes a bit; this is P.E.A. turning into oxytocin. This is a deeper kind of love that humans develop once they have been with a partner for long enough. High levels of oxytocin are found when a mother has a child, usually found during breastfeeding.
There are many natural drugs that your body produces to create the feeling of love. If you have any questions, let me know! Hope this helps!
Why are the very lowest mass stars unable to fuse helium in their cores?
Water molecules are made of slightly positively charged hydrogen atoms and slightly negatively charged oxygen atoms. which force keeps water molecules stuck to one another?
Water molecules are held together by an electromagnetic force known as hydrogen bonds. These bonds are a strong type of dipole-dipole interaction due to the partial positive charge of hydrogen atoms and partial negative charge of oxygen atoms. Option D is correct.
The electromagnetic force is responsible for keeping water molecules attracted to one another. More specifically, this attraction is due to hydrogen bonds, which are a strong type of intermolecular force. These bonds form because of the dipole interaction where the slightly positively charged hydrogen atoms of one water molecule are attracted to the slightly negatively charged oxygen atoms of another. Although individual hydrogen bonds are weaker than covalent and ionic bonds within molecules, they occur in large numbers in water, resulting in a significant force that holds the water molecules together.
Hydrogen bonds are particularly strong compared to other dipole-dipole interactions because of water's highly polar nature. This polarity is due to the oxygen atom in water being highly electronegative and possessing two lone pairs of electrons, resulting in a partial negative charge while the hydrogen atoms have a partial positive charge.
Hence, D. is the correct option.
The complete question is:
Water molecules are made of slightly positively charged hydrogen atoms and slightly negatively charged oxygen atoms. Which force keeps water molecules stuck to one another?
A.) Strong Nuclear
B.) Gravitational
C.) Weak Nuclear
D.) Electromagnetic
Question 1 unsaved the atoms of group b elements _____ electrons when they form ions. question 1 options: cannot be determined either gain or lose lose gain
How does the law of conservation of mass apply to this reaction: C2H4 + O2 → H2O + CO2?
When the compound BaCl2 forms , what happens to the Ba and Cl ions
Answer : The correct answer is Ba²⁺ and Cl⁻ ions .
This can be explained using Solubility concept .
Solubility is defined as property referring to ability of a substance , SOLUTE , to dissolves in a SOLVENT . It is measured at maximum amount of solute that dissolves in solvent as equilibrium .
Solubility of any compound can be checked using Solubility Rule ( Image ).
BaCl₂ is salt of Chloride . Since the solubility rules says that salts if chlorides are soluble , Hence BaCl₂ is also soluble .
SO when BaCl₂ forms in aqueous solution , it again dissociates to forms ions since it is soluble in aqueous solution . It produced one Ba²⁺ ion and two ions of Cl⁻ .
The BaCl₂ dissociates as follows :
[tex] BaCl_2 (aq) \rightarrow Ba^2^+ (aq) + 2 Cl^- (aq) [/tex]
Hence even BaCl₂ forms but it remain as dissociated ionic form as Ba²⁺ and Cl⁻ ions.
The table shows the results of four surveys that randomly sampled 50 girls at a community center about their favorite sport at the center.
Swimming Basketball Soccer Total
Survey 1 16 15 19 50
Survey 2 15 15 20 50
Survey 3 7 35 8 50
Survey 4 14 18 18 50
Identify surveys that are likely biased. Based on the unbiased surveys, what percent of the girls at the community center are likely to choose swimming as their favorite sport?
14 %
23 %
26 %
30 %
Answer:
30%
Explanation:
How many elements are in a compound that has a formula NiCI2+6H2O?
How many grams of MgCl2 will be obtained when 435 mL of 0.300 M HCl react with an excess of Mg(OH)2?
) how much of a 0.225 m kcl solution contains 55.8 g kcl?
Answer : The volume of solution is, 3.33 liter
Explanation : Given,
Mass of KCl = 55.8 g
Molar mass of KCl = 74.5 g/mole
Molarity = 0.225 M
Molarity : It is defined as the number of moles of solute present in one liter of solution.
In this question, the solute is KCl.
Formula used :
[tex]Molarity=\frac{w_b}{M_b\times V}[/tex]
where,
[tex]w_b[/tex] = mass of solute KCl
[tex]M_b[/tex] = molar mass of solute KCl
V = volume of solution = ?
Now put all the given values in the above formula, we get the molarity of the solution.
[tex]0.225mole/L=\frac{55.8g}{74.5g/mole\times V}[/tex]
[tex]V=3.33L[/tex]
Therefore, the volume of solution is, 3.33 liter
What are the relative ion concentrations in an acid solution?
An Arrhenius base is a
substance that dissociates in water to form hydroxide ions (OH⁻).
For example lithium hydroxide is an Arrhenius base:
LiOH(aq) → Li⁺(aq) + OH⁻(aq).
Answer:
more H+ ions
Explanation:
What is the bond angle in a tetrahedral molecule? 120° 180° 109.5° 90°
The bond angle in a tetrahedral molecule is ideally 109.5° but can be slightly smaller in molecules like water and ammonia due to the presence of lone pairs of electrons.
Explanation:The bond angle in a tetrahedral molecule is 109.5°. However, it can differ slightly due to the effects of repulsion between atoms or if lone pairs of electrons are involved. For instance, in water, which has a tetrahedral structure, the angle is 104.5° due to the two lone pairs of electrons on the oxygen atom.
These lone pairs occupy more space, causing the bond angle to be slightly less than the ideal. Similarly, ammonia has a bond angle of 107.3° due to its one lone pair. Thus, while the ideal bond angle in a tetrahedral molecule is 109.5°, the presence of lone pairs can cause the angle to be slightly smaller.
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The formula for carbohydrates is C n H 2n O n . Which statement accurately describes this general formula?
A_There are more carbon atoms than oxygen atoms.
B_There are twice as many carbon atoms as hydrogen atoms.
C_The ratio of the atoms is 1:1:2 in the carbohydrate formula.
D_There are twice as many hydrogen atoms as carbon atoms.
How is stoichiometry used to calculate the amount of product from amount of reactant?
Stoichiometry relates moles of rectant to moles of product
In the Bronsted-Lowry model of acids and bases, a(n) _____ is a hydrogen donor and a(n) _____ is a hydrogen acceptor.
In the Bronsted-Lowry model of acids and bases, an acid is a hydrogen donor and a base is a hydrogen acceptor.
What is Bronsted-Lowry acid and base?Bronsted-Lowry acid is any substance that donates a proton or hydrogen ion while a Brønsted-Lowry base is that which accepts an hydrogen ion.
Based on this definition, it can be said that a Brønsted-Lowry acid must possess hydrogen ion(s) to donate.
Examples of Brønsted-Lowry acid are as follows:
HClHCNH2SO4Therefore, in the Bronsted-Lowry model of acids and bases, an acid is a hydrogen donor and a base is a hydrogen acceptor.
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See the picture to answer the question
the solid line is the results obtained when no catalyst was used and the broken line is the results obtained when a catalyst was used .how much energy must the system absorb for the reaction to start if no catalyst was used?
Which substance is insoluble and floats in water? A) Ice shavings B) Wood shavings C) Salt crystals D) Sugar crystals