Why can you predict the base sequence of one strand in a molecule of DNA if you know the sequence of the other strand?


A-The order of bases in the two strands are identical.

B-There are only two base sequences, and a DNA molecule has each.

C-In DNA, each base pairs up with only one other base.

D-Every molecule of DNA has the same base sequence.

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.

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

https://brainly.com/question/34790269

#SPJ6

2.86 °C = (1) (1.86 °C kg mol-1) (x / 0.750 kg)

2.86 °C = (2.48 °C mol-1) (x)

x = 1.1532 mol

33.7 g / 1.1532 mol = 29.2 g/mol

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.

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

Final answer:

To produce 432 grams of silver from the reaction of copper with silver nitrate, 127.23 grams of copper are required according to stoichiometry and the mole ratio from the balanced equation.

Explanation:

To determine the number of grams of copper required to produce 432 grams of silver in the reaction with silver nitrate, we must first understand the balanced chemical equation:

Cu(s) + 2 AgNO3(aq) → Cu(NO3)2(aq) + 2 Ag(s)

From this balanced equation, we can see that one mole of copper reacts with two moles of silver nitrate to produce one mole of copper(II) nitrate and two moles of silver. To solve the problem, we need three molar masses: that of copper (63.55 g/mol), silver nitrate (169.88 g/mol), and silver (107.87 g/mol). Using stoichiometry, we can set up the calculation as follows:

432 g Ag x (1 mol Ag / 107.87 g Ag) x (1 mol Cu / 2 mol Ag) x (63.55 g Cu / 1 mol Cu) = grams of Cu required

By calculating, we get:

432 g Ag / 107.87 g/mol Ag = 4.004 mol Ag

4.004 mol Ag x 1 mol Cu / 2 mol Ag = 2.002 mol Cu

2.002 mol Cu x 63.55 g/mol Cu = 127.23 g Cu

Therefore, 127.23 grams of copper are required to produce 432 grams of silver when copper reacts with silver nitrate according to the balanced equation.

Answer: The molarity of solution is 0.67 M

Explanation:

To calculate the molarity of solution, we use the equation:

[tex]\text{Molarity of the solution}=\frac{\text{Mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (in mL)}}[/tex]

We are given:

Mass of solute (KCl) = 5.0 g

Molar mass of potassium chloride = 74.55 g/mol

Volume of solution = 100 mL

Putting values in above equation, we get:

[tex]\text{Molarity of solution}=\frac{5g\times 1000}{74.55g/mol\times 100mL}\\\\\text{Molarity of solution}=0.67M[/tex]

Hence, the molarity of solution is 0.67 M

Fluorine atoms have seven valence electrons according to their electron configuration, which is reflected in their belonging to Group 7A of the periodic table and is also depicted in their Lewis dot structure.

According to the given electron structure of fluorine (F=1s22s22p5), fluorine atoms have seven valence electrons. The electron configuration indicates that there are two electrons in the first energy level (1s2) and seven electrons in the second energy level (2s22p5). Since the second energy level is the outermost shell, these seven electrons are considered the valence electrons.

Fluorine belongs to Group 7A in the periodic table, which means it is expected to have seven valence electrons. This is confirmed by the electron configuration. These valence electrons are represented in a Lewis dot structure by placing seven dots around the symbol for fluorine (F).

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:

Stoichiometry relates moles of rectant to moles of product

Chemical reactions can result in new compounds, while nuclear reactions can result in new elements.

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.

In the Bronsted-Lowry model of acids and bases, an acid is a hydrogen donor and a base is a hydrogen acceptor.

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:

Therefore, in the Bronsted-Lowry model of acids and bases, an acid is a hydrogen donor and a base is a hydrogen acceptor.

Learn more about Brønsted-Lowry acid and base at: https://brainly.com/question/14407412

#SPJ2

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!

How does the law of conservation of mass apply  to this reaction: C2H4 + O2 → H2O + CO2?

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:

Answer:

30%

Explanation:

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.

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.

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.

Option B: NaCl (aq)

There are two important factors that make a compound a good conductor of electricity that is its state and number of charge particles.

Here, the substances in solid state do not conduct electricity due to unavailability of free ions as movement of free ions in a substance is responsible for electricity conduction.

Therefore, NaCl(s) and [tex]C_{6}H_{12}O_{6}(s)[/tex] do not conduct electricity.

Now, out of NaCl(aq) and and [tex]C_{6}H_{12}O_{6}(aq)[/tex], NaCl(aq) is a good conductor of electricity because in aqueous solution, NaCl completely dissociates into [tex]Na^{+}[/tex] and [tex]Cl^{-}[/tex] ions. Due to the presence of these ions it is good conductor of electricity.

NaCl (aq) is the best conductor of electricity. Therefore, option B is correct.

When NaCl is dissolved in water, it dissociates into its constituent ions, Na+ and Cl-. These ions are electrically charged particles that can move freely in the solution. The presence of these mobile ions allows the solution to conduct electricity.

In an aqueous solution of NaCl, the positively charged sodium ions (Na+) and negatively charged chloride ions (Cl-) are attracted to the oppositely charged electrodes of an electrical circuit. When a voltage is applied across the solution, the ions are driven toward their respective electrodes. This movement of charged particles constitutes an electric current. Thus, option B is correct.

Learn more about NaCl, here:

https://brainly.com/question/14126616

#SPJ6

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

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.

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.

https://brainly.com/question/3995950

#SPJ12

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).

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.

https://brainly.com/question/1600305

#SPJ12

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:

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