What is the main difference between DNA and RNA? DNA contains ribose sugar, and RNA contains deoxyribose sugar instead. DNA contains cytosine, and RNA contains guanine instead. DNA contains deoxyribose sugar, and RNA contains ribose sugar instead. DNA contains adenine, and RNA contains guanine instead.

Answer:

Grams of Ti = 4.56 g

Explanation:

Given:

# atoms of Titanium = 5.74*10²²

To determine:

The mass of Ti in corresponding to the given number of atoms

Explanation:

1 mole of any substance contains Avogadro's number of atoms.

i.e. 1 mole of Ti = 6.023*10²³ atoms

Since 1 mole Ti = 47.90g,

47.90 g of Ti contains 6.023*10²³ atoms

Therefore, [tex]= \frac{5.74*10^{22}  atoms*47.90g}{6.023*10^{23} atoms} =4.56\ g[/tex] of Ti would correspond to:

Answer : Option C) 5.1

If we consider any weak acid and strong base titration. We usually observe that the pH initially rises quite fast then remains constant during the buffer region before rising rapidly to the end point.

So, if 5 mL of NaOH is considered to be the one third of the way to the endpoint, then after the initial rise which will be more than 3.4 and reaching to the buffer region before rising to the endpoint.

Now, if endpoint has pH of 8.6 a buffer region around 5 is a good but the acid could be acetic acid which has similar pH endpoints with the pKa of 4.74 - so buffer region around 5 will be the good condition.

And hence pH of 5.1 is the most probably the right answer.

5.1 would be the clostest answer

Answer:

90 years

Explanation:

it takes three halves of one to get to 1/8.

So 30 times 3 = 90

Generating a key from bottom to top signifies rearranging data in a particular order, often used in sorting or indexing processes. The actual sequence depends on the set rules, such as alphabetically or numerically.

The correct sequence from bottom to top when generating a key for data, generally implies rearranging the data in a specific order. Let's consider a scenario in which we have data items named A, B, C, and D from bottom to top. In this case, the correct sequence from bottom to top might be D, C, B, A, assuming we're ordering in reverse-alphabetical order. However, the exact sequence can depend on the specific criteria or rules you're using to generate the key.

These keys are often used in computer operations such as sorting and indexing to manage and locate data efficiently. It's always important to understand the specific context in which the key is being applied for an accurate sequence.

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Answer:

silicates are extended arrays of silicon and oxygen.  

Explanation:

By definition, a silicate is a compound consisting of the chemical elements silicon (Si) and oxygen (O), derived from salicylic acid, which may be a salt or an ester. Of this group stand out the silicates formed by the alkali metals, constituent elements of Family IA of the periodic table, which are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs) and francium. (Fr), as these are water soluble and have various applications in industry and the laboratory. This list excludes the last two elements mentioned, due to their high molecular weight and their radioactivity. It is also relevant to report that salicylic acid is one of the derivatives of the second most abundant chemical element in the earth's crust, of the order of 27%, silicon (Si).

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

Final answer:

In a neutralization reaction, an acid reacts with a base to form salt and water, and the net ionic equation for this reaction usually involves hydrogen ions from the acid joining with hydroxide ions from the base to form water.

Explanation:

A general word equation for a neutralization reaction is: Acid + Base → Salt + Water

During neutralization, the hydrogen ions from the acid react with the hydroxide ions from the base to form water. The remaining ions (from the acid and base) then combine to form a salt. If we consider the neutralization of a strong acid with an ionic hydroxide, the net ionic equation simplifies to:

H3O+ (aq) + OH−(aq) → 2H2O(l)

This equation represents the concentration of hydrogen ions from the acid reacting with hydroxide ions from the base, simplifying down to just the formation of water since strong acids completely dissociate in water.

To calculate the molar concentration of the base, use stoichiometry and the given volume and concentration of the acid. The balanced chemical equation helps determine the moles of acid and base. Divide the moles of base by the volume of the base solution to find the molar concentration.

To calculate the molar concentration of the base, we can use the stoichiometry of the neutralization reaction between calcium hydroxide (Ca(OH)2) and hydrochloric acid (HCl). The balanced chemical equation for this reaction is:

Ca(OH)2 + 2HCl → CaCl2 + 2H2O

From the equation, we can see that 1 mole of Ca(OH)2 reacts with 2 moles of HCl. We are given that 26.85 mL of 0.225 M HCl is required to neutralize a 10.0 mL solution of Ca(OH)2. The moles of HCl can be calculated using the equation:

moles of HCl = volume of HCl (L) × concentration of HCl (M)

Once we have the moles of HCl, we can use the stoichiometry of the reaction to calculate the moles of Ca(OH)2. Finally, we divide the moles of Ca(OH)2 by the volume of the Ca(OH)2 solution to find the molar concentration.

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The most reactive nonmetals are found in the column second from the right side of the periodic table, also known as Group 17 or the halogens. They are highly reactive because they need to gain just one electron to complete their outer electron shell. Fluorine is the most reactive nonmetal.

The most reactive nonmetals are located in the upper right section of the periodic table, in the column that is second from the right side. This column is known as Group 17, or the halogens. Halogens are highly reactive due to their propensity to gain an electron to fill their outer electron shells, and they exhibit rich variety of chemical behaviors.

Elements belonging to the same column or group, such as the halogens, share many chemical characteristics because they have the same number of valence electrons.

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The final temperature of benzene after adding 2500 J of energy is 41.97°C.

To determine the final temperature of benzene after adding 2500 J of energy, we can use the formula for specific heat capacity:

q = mcΔT

Where:

Rearranging the formula to solve for ΔT:

ΔT = q / (mc)

Substitute the given values:

[tex]\Delta T = \frac{2500 \, \text{J}}{120 \, \text{g} \times 1.74 \, \text{J/g \textdegree C}}\\\\\Delta T = \frac{2500 \, \text{J}}{208.8 \, \text{J/°C}} \approx 11.97 \textdegree C[/tex]

Add this change to the initial temperature of 30°C:

Final temperature = 30°C + 11.97°C = 41.97°C

Therefore, the final temperature of the benzene after adding 2500 J of energy is 41.97°C.

To find the volume of hydrogen gas produced at STP from the reaction of 78.33g of aluminum with excess water, calculate the moles of aluminum, convert that to moles of hydrogen gas using stoichiometry, and then use the molar volume at STP to find 97.44 liters of hydrogen gas.

To determine the volume of hydrogen produced at STP (Standard Temperature and Pressure) by the reaction of aluminum with excess water, we first need to write the balanced chemical equation for the reaction.

For aluminum reacting with water yielding aluminum hydroxide and hydrogen gas, the balanced equation is:

From this equation, we can see that 2 moles of aluminum produce 3 moles of hydrogen gas. To find the moles of aluminum in 78.33g, we use the molar mass of aluminum (approximately 26.98 g/mol).

Thus, the reaction of 78.33g of aluminum with excess water will produce 97.44 liters of hydrogen gas at STP.

Blood boils at a temperature close to water's boiling point: 100°C, 373 K, or 212°F. This boiling point slightly varies due to dissolved substances. Understanding these values illustrates the relationship among different temperature scales.

When considering the temperature at which blood boils, it primarily depends on its composition, but generally, it is close to the boiling point of water. The boiling point of water is an important reference and is commonly known for each temperature scale:

Human blood is mostly water, and hence its boiling point is similarly close; however, due to the presence of dissolved proteins, salts, and other substances, the exact boiling point may slightly vary. At normal atmospheric pressure, it is approximately 100°C (373 K or 212°F). This concept is an important illustration of the relationship among the temperature scales.

Answer:

Heat is transferred through contact between molecules.

Explanation:

a-p-e-x

Amino acids combine to form complex macromolecules called proteins. Other listed macromolecules - phospholipids, carbohydrates, and polysaccharides - are not made from amino acids.

Amino acids are the building blocks of proteins. They join together in a specific sequence to form these complex macromolecules. In the list provided, the correct answer is 'B. Proteins'. This is because phospholipids, carbohydrates, and polysaccharides are different types of macromolecules constructed from other monomers, not amino acids. The resulting protein structure determines its function in an organism.

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When CH₄ burns with the presence of O₂, CO₂ and H₂O are formed as the products. The balanced equation is;

CH₄ + 2O₂ → CO₂ + 2H₂O

When the reaction happens, 4 C-H bonds of CH₄ and O=O bond of O₂ are broken down to form 2 C=O bonds in CO₂ and 2 O-H bonds in H₂O.

The broken and formed bonds are marked in the image.