calculate the formula mass of rubidium carbonate, rb2co3. 340.43 amu 255.00 amu 113.48 amu 230.95 amu 145.47 amu

The correct answer for the first question is e) none of the above determines if product forms. For the second question, the correct answer is a) lower the free energy of activation to a value below the free energy of the reactants and products.

Adding an enzyme to a solution containing only the product(s) of a reaction will not lead to the formation of substrate. Enzymes are highly specific catalysts that facilitate the conversion of substrate(s) into product(s) by lowering the activation energy required for the reaction.

However, enzymes do not have the ability to generate substrate from products alone. Substrate availability is crucial for the enzyme to catalyze a reaction.

As for the second question, the correct answer is a) lower the free energy of activation to a value below the free energy of the reactants and products. Enzymes work by lowering the activation energy required for a reaction to occur, enabling the reaction to proceed more readily.

By doing so, enzymes facilitate the conversion of substrates into products by reducing the energy barrier (activation energy) that needs to be overcome. This allows the reaction to occur at a faster rate and under milder conditions compared to the uncatalyzed reaction.

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Answer:

Resonance effect is a chemical phenomenon that occurs when electrons in a molecule are delocalized or spread out over multiple atoms or bonds. This results in the stabilization of the molecule and can affect its reactivity and properties. Resonance occurs when there are multiple ways to draw the Lewis structure of a molecule, and each structure contributes to the overall electronic structure of the molecule. The resonance effect is commonly observed in organic chemistry, where it can influence the acidity or basicity of a molecule, as well as its stability and reactivity in chemical reactions.

Explanation:

cooked rice

nutrient

carbohydrate.

Boiler eggs

nutrient

Protein.

Answer:

The volume of two moles of oxygen at STP is

Assuming that the gas is at standard temperature and pressure (STP), one mole of any gas occupies 22.4 L . This means the number of moles of O2 is 222.4=0.089 mol .

Explanation:

Answer:

Leaves have a large surface area so more light hits them. The upper epidermis of the leaf is transparent, allowing light to enter the leaf. The palisade cells contain many chloroplasts which allow light to be converted into energy by the leaf

Answer:

The main function of a leaf is to produce food for the plant by photosynthesis. Chlorophyll, the substance that gives plants their characteristic green colour, absorbs light energy. The internal structure of the leaf is protected by the leaf epidermis, which is continuous with the stem epidermis.

Explanation:

Answer:

The Ideal gas law

Explanation:

From the given question, we have:

V \(\alpha\) \(\frac{nT}{P}\)

where each variable has its usual meaning.

Thus,

V = \(\frac{nRT}{P}\)

where R is the ideal gas constant

cross multiply to have;

PV = nRT

This implies that the volume of the gas is directly proportional to the number of moles of the gas.

Therefore, the law can be used to determine the relationship between the volume and number of moles is the ideal gas law.

Answer:

23: 6000560000000

24: 0.0015

25: 200

26: 0.0105

27: 600

28: 4023000

Explanation:

You have to move the decimal the same amount of times as the exponent says.

For example, like with the 6, you move it 2 decimals to the right (since it's positive), and the regular number would be 600.

The balanced equation is 2Na + 2H2O → NaOH + H2

2Na+2H2O2NaOH+H2 is the balanced chemical equation.

A neutralization reaction is a chemical reaction in which an acid and a base combine quantitatively to generate a salt and water as products. A neutralization reaction involves the formation of water by the interaction of H+ ions and OH- ions.

To meet the rule of conservation of matter, which stipulates that matter cannot be generated or destroyed in a closed system, chemical equations must be balanced. A chemical equation’s balance is governed by the rule of conservation of mass. Water is formed when positive hydrogen ions from HCl and negative hydroxide ions from NaOH mix.

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Answer:

Generate concept.

Explanation:

The process of designing includes many processes out of which the process of developing the idea for a new product is called Generate concept.

Product idea( concept) generation is a act that begins with a list of criteria set by the client regarding his necessities and preferences. Based on the criteria, concept generation aims to pinpoint a range of potential ideas and solutions that addresses those needs.

Answer:

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question we have

mass = 2.54 × 200

We have the final answer as

Hope this helps you

Actually the main difference:

Homogeneous mixture is a mixture consisting of constituent substances that are mixed evenly.  As a result, each part of the mixture has the same properties

 In contrast to heterogeneous mixtures where the constituent substances are not mixed evenly.  Thus, there are parts of the mixture that have different properties.

Differences between Homogeneous and Heterogeneous Mixtures in detail

1. Differences Between Homogeneous and Heterogeneous Mixtures Based on Their Definitions

Homogeneous is a mixture that is uniform in all its parts and forms a single phase.  An example of a homogeneous mixture is air.  In addition, homogeneous mixtures can also be commonly referred to as solutions.

Meanwhile, heterogeneous mixture is a mixture that is not similar or not uniform, and the formation of two or more phases, as well as the existence of a clear boundary between the phases.  Examples of heterogeneous mixtures include oil and water, a mixture of lime and sand, then a mixture of iron powder and carbon, and many others.

2. Differences Between Homogeneous and Heterogeneous Mixtures Based on Their Characteristics

The characteristics of this homogeneous mixture are in the form of constituent particles that cannot be distinguished from one another, have almost the same color, and have a similar taste.  Not only that, substances that have been mixed have the same ratio, have the same concentration level, and are in the form of solids, gases, and liquids.

And this mixture cannot be separated, if you use a mechanical method, but you can separate it when you use a more difficult method.  The example of such separation is similar to that of distillation.  That is one of the differences between homogeneous and heterogeneous mixtures based on their characteristics.

3. Difference between Homogeneous and Heterogeneous Mixtures Based on Their Properties

The nature of this homogeneous mixture has the property that if every part of a homogeneous mixture is often the same, both in terms of color, taste, and comparison.  An example of the nature of the homogeneous mixture is a spoonful of sugar dissolved in water.

While the nature of a heterogeneous mixture is a mixture of two or more substances, which have properties, the constituent substances are not the same or the alias is not uniform.  So that the two mixed substances can still be distinguished by the particles.

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Answer:

Geothermal energy

Explanation:

Hope that helps !!!

A solution comprises solute and solvent that can be in the form of the same or different composition. The water is solvent and the mixture is solute. Thus, option c is correct.

A mixture is a solution that may or may not have a definite and uniform composition. They even can have one or more phases. The mixture can be heterogeneous or homogeneous.

Here, the water is the solvent to which the solute, vinegar, and dye are added. The vinegar and dye both are liquid solutes that are added to the solvent to form a solution of definite composition.

Therefore, option c. mixture is the solute and water is the solvent.

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To begin with, sucrose is C12H22O11. Additionally, we must determine how many moles of sucrose there are in a pound of sucrose:

The moles of sucrose are 454g, 342.30g, mol1, and 1.33mol.

Is sucrose a good sugar to use?

Brief Summary According to a University of California, Davis study that was published in the Journal of Clinical Endocrinology and Metabolism, sucrose, the more "natural form of sugar," may be just as harmful to your health as HFCS.

Is sugar a healthy food?

Your body only receives sugar when you consume sucrose like soda or candy, and typically too much of it. The threat is present here. You run the risk of major health problems if you consume too much added sugar (fructose or sucrose) in your diet.

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Using the combined gas law, the temperature of a gas at 101.3 kPa is calculated to be 39.5°C, given its initial pressure and temperature of 801.3 kPa and 40.0°C, respectively.

To solve this problem, we can use the combined gas law which states that:

(P1V1/T1) = (P2V2/T2)

where P1 and T1 are the initial pressure and temperature, and P2 and T2 are the final pressure and temperature.

We are given P1 = 801.3 kPa and T1 = 40.0°C, and we want to find T2 at P2 = 101.3 kPa.

Let's assume that the volume (V1) of the gas is constant. Therefore, we can write:

(P1/T1) = (P2/T2)

Solving for T2, we get:

T2 = (P2 x T1)/P1

Substituting the given values, we get:

T2 = (101.3 kPa x 313.15 K)/801.3 kPa

T2 = 39.5°C (rounded to one decimal place)

Therefore, the temperature of the gas at 101.3 kPa is 39.5°C.

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Answer:

the answer is 170g. nnhhj

Answer:

the answer would be 170g, because all you have to do is add both so 100g + 70g+ 170g therefore the answer is 170g

Explanation:

Metals and nonmetals usually form ionic compounds, whereas two bonded nonmetals are never ionic because of their electronegativity difference.

Electronegativity is the measure of an element's tendency to attract bonding electrons towards itself. Metals are usually electropositive, meaning they have fewer electrons in their outer shell, while nonmetals are usually electronegative, meaning they have more electrons in their outer shell than metals.

The electronegativity difference between a metal and a nonmetal is usually high, resulting in ionic bonding. The electrons of the metal are transferred to the nonmetal, forming ions. For example, sodium (Na) and chlorine (Cl) react to form an ionic compound, sodium chloride (NaCl). The Na atom gives its outer electron to the Cl atom to form Na+ and Cl- ions respectively. This transfer of electrons produces a stable arrangement of ions.

In contrast, the electronegativity difference between two nonmetals is usually low, leading to covalent bonding. In covalent bonding, the atoms share their outer electrons to form a stable molecule. For example, H2O is a covalent compound, where two hydrogen atoms and an oxygen atom share their outer electrons to form a molecule.

Hence, the two bonded nonmetals never form ionic compounds.

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The percent composition of NaCl in the water is C. 3.6%

Explanation:To calculate the percent composition of NaCl in the seawater, we need to calculate the mass of NaCl in the sample, which is given by: mass of NaCl = moles of NaCl × molar mass of NaCl

We are given that the sample contains 0.317 moles of NaCl.

The molar mass of NaCl can be found by adding the atomic masses of sodium (Na) and chlorine (Cl). This gives us:molar mass of NaCl = atomic mass of Na + atomic mass of Cl

= 23.0 g/mol + 35.5 g/mol

= 58.5 g/mol

Therefore, the mass of NaCl in the sample is:mass of NaCl = 0.317 mol × 58.5 g/mol= 18.5 g

Now we can calculate the percent composition of NaCl in the seawater.

This is given by the ratio of the mass of NaCl to the mass of the sample, multiplied by 100%.

That is:percent composition of NaCl = (mass of NaCl / mass of sample) × 100%

We are given that the sample has a mass of 520 g, so:percent composition of NaCl = (18.5 g / 520 g) × 100%

≈ 0.036 × 100%

≈ 3.6%

Therefore, the answer is C. 3.6%.

Note that the options given in the question are off by a factor of 10. The correct answer is 3.6%, not 36%.

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Answer:

line graphs

hope this helps :)

A- the decay of U-238 to Th-234

right on edge 2021

Answer:

A) the decay of U-238 to Th-234

:)

Explanation:

Answer:

Tha nolar mass of aluminium is 26.98 g/mol; the molar mass of (atomic) oxygen is 16.90 g/mol.

Explanation:

1 mol of Al2O3 therefore has a mass of 2(26.98)+3(16.00)=101.96 g.

Divide this into the given mass, to find the number of moles here:

(204 g)/(101.96 g/mol)=2.001 mol

There are 2 moles of aluminium per mole of aluminium oxide, so there are 2(2.001)=4.002 moles of aluminium in the sample.

Then there are (4.002 mol)(26.98 g/mol)=107.97 g of Al. Since the given mass has only 3 significant figures, round this answer o 108 g.

n H2 = m H2 / Mr H2

n H2 = 2 / 2

n H2 = 1 mol

n O2 = m O2 / Mr O2

n O2 = 4 / 32

n O2 = 0.125 mol

O2 is a limiting reactant

n H2O = (coef. H2O / coef. O2) • n O2

n H2O = (2 / 1) • 0.125

n H2O = 0.25 mol

m H2O = n H2O • Mr H2O

m H2O = 0.25 • 18

m H2O = 4.5 gr

Answer:the positive ionic radius is smaller than the neutral atomic radius

Explanation:

Answer:The positive ionic radius is smaller than the neutral atomic radius.

Explanation: just took the test

When 3-phenylpropanoic is treated with a catalyst such as NaOH/H₂O, the expected organic product is sodium salt of 3 - phenylpropanoic acid

Carboxylic acids when treated with a base like NaOH or KOH gives carboxylate ion because H⁺ from acid reacts with OH⁻ from base gives H₂0 and salt of sodium carboxylate. NaOH is considered to be an excellent catalyst for the hydride transfer in organic compounds such as aromatic and aliphatic ketones.

The mechanism for the reaction is given below:

In the mechanism, NaOH dissociates as Na⁺ OH⁻ , the H⁺ ion from OH group of 3-phenylpropanoic acid is abstracted by OH- to form a water molecule (H₂O). Thus a  negative charge is created at the terminal O atom of carboxylic group where the Na⁺ ion attacks to form the resultant product i.e sodium salt of 3-phenylpropanoic acid.

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The carbon attached to the ethyl group should be given #1 when naming this compound systematically.

According to the rules of IUPAC Nomenclature of organic compounds.

When there is a ring present in the compound. The carbon atom that should be assigned as #1 should be the one which has highest number of branch or it is containing the largest number of carbon atoms from starting a point.

As we can see the there is a five member carbon ring which has three branches.

One branch is of of methyl and the second branch is of ethyl as we can see that ethyl contains two carbon atoms so we will be giving number one to that member of the carbon ring which has ethyl attached to it.

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Answer:

3 significant numbers

The hydrogen bonding of water is one of the main property of water which makes it responsible for all the other physical and chemical properties.

Water molecules are polar in nature and they form hydrogen bonds. Hence, they have a high boiling point , high specific heat and density. Water can exhibit the properties of an acid, as well as a base (amphoteric character). The water molecules are constantly moving and the hydrogen bonds continuously breaks and forms again. These hydrogen bonds are strong, which is the reason for the unique properties of water.

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