the malonic ester synthesis is a method for preparing carboxylic acids from alkyl halides. for each of the carboxylic acid products, draw the structure of the alkyl bromide that would be used in its synthesis. alkyl bromide a an arrow with three steps points to a carboxylic acid bonded to c h 2 bonded to a 5 carbon ring. step 1 is diethyl malonate with sodium ethoxide in ethanol. step 2 is n a o h and water. step 3 is h 3 o plus and heat. alkyl bromide b

The volume of a container is found to be 38. 5 in3. What is the volume in units of cm3?

Explanation:

631cm^3

Answer:

it's either a or b not c or d. there you go hope I helped

Explanation:

salt grains are very small, just like water molecule. so yea, hope I helped you out whoever you are.

Answer:

The last option. Because it's not a curate or precise on the dot.

Answer:

AlI3

Ag2O

k3N

Ca3(PO4)2

MgF2

Compounds are formed by the combination of two or more molecules. A compound differs from a mixture as the former has a definite composition. Thus, option c is correct.

Compounds are said to be substances that have been composed of various identical molecules bonded together by chemical bonds. They are homogenous substances that have fixed ratios ad proportions.

Mixtures are substances composed of various substances linked by the physical interactions that vary in composition and can be homogenous and heterogeneous.

Therefore, option c. the compounds have fixed composition, unlike the mixtures.

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If the bonds of a reactant molecule break so that simpler molecules, atoms or ions form, the reaction is an exchange reaction called decomposition reaction

Decomposition reactions occur when complex chemical entities split apart into smaller components. Decomposition reactions often demand energy input. For instance, the thermal breakdown of potassium chlorate (KClO3) is a typical technique used in laboratories to generate oxygen gas.

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Answer:

pour the rock salt mixture through a filter made from paper and allow the liquid to filtrate

Explanation:

Separating Sand and Salt

Probably the easiest method to separate the two substances is to dissolve salt in water, pour the liquid away from the sand, and then evaporate the water to recover the salt.

Answer:

A the strong bonds between particles.

Explanation:

this is because in solids we say that they have a weak boling point due to the strong bond that makes it hard to melt

As ,in diagram D we can see that there are only one type of atoms are joined, so they are pure substances. The particle of diagrams that represent a pure substance is Option D.

The substance which is made up of only one kind of particle and cannot be separated into other kind of matter is called Pure substance.

Example: Gold metal, sugar, salt, copper wire, diamond etc.

These substance are of two types

So, we are going to find out the pure substance from the below diagrams.  All other are mixtures having different kind of element.

Thus from the above conclusion we can say that the option D represents pure substance.

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2.020 × 10⁻²⁵ has four significant figures and 5.00  × 10²⁷ has three significant figures; correct option is A.

Significant figures are ways of expressing numbers in approximations such that the number of digits which are considered significant in a given number is stated.

Significant figures are used in approximation of numbers.

Some rules for determining significant figures are given below:

From the above rules:

2.020 × 10⁻²⁵ has four significant figures.

5.00  × 10²⁷ has three significant figures.

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Filtration is useful for separating solids from liquids or gases compounds (option A).

Filtration is the act or process of filtering or in chemistry, it is the mechanical separation of a liquid from the undissolved particles floating in it.

Filtration is a common separation technique employed in chemistry for the partitioning of an undissolved solid from a liquid solvent.

For example; when a mixture of sand and water is filtered, the sand stays behind in the filter paper as the residue while the water passes through the filter paper to become the filtrate.

Therefore, it can be said that filtration is useful for separating solids from liquids or gases compounds.

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Answer:

Solids from liquids or gases

Explanation:

Connexus

Answer:

(a) protons: 11 electrons:11

(b) protons: 56 electrons: 54

(c) protons: 8 electrons: 10

(d) protons: 27 electrons: 24

Explanation:

Answer:

Helping Hand Organization

The dependent variable in this type of experiment is referred to as the Plant growth and is therefore denoted as option D.

This refers to a type of  variable whose value will change depending on the value of another variable which is referred to as the independent variable. It is also referred to the variable which is usually tested or measured when an experiment is done by scientists.

In this case, we were told that the plant were exposed to different criteria such as the music types and the constants such as light and water and the effect on the plant growth will be measured after sometime.

Since the parameter to be measured is the plant growth then it is referred to as the most appropriate choice for dependent variable.

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8 valence electron are present in Neon .

The electrons in an atom's outermost shell, or energy level, are called valence electrons.

The amount of electrons an atom has in its outermost valence shell determines how it bonds with other atoms.

The Periodic Table groups together elements whose atoms have the same number of valence electrons for this reason.

Neon, with a Z=10, possesses eight valence electrons. Due to its closed-shell structure, neon is extremely difficult to oxidise and decrease.

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Answer:

0.001 mole

Explanation:

I attached my answer

Answer:

step 1- wash the rice cooker

step2-

Answer:3

Explanation:

In the balanced reaction of the combustion of nitric oxide (NO), two bonds are broken.

Nitric oxide (NO) is composed of a nitrogen atom bonded to an oxygen atom. During combustion, NO reacts with oxygen (O2) to form nitrogen dioxide (NO2). The balanced chemical equation for this reaction is:

2 NO + O₂ → 2 NO₂

In this reaction, there are two molecules of nitric oxide (NO) on the left-hand side of the equation. Each nitric oxide molecule has one nitrogen-oxygen bond, so there are a total of two bonds in the reactants.

On the right-hand side of the equation, there are two molecules of nitrogen dioxide (NO2). Each nitrogen dioxide molecule has two nitrogen-oxygen bonds, so there are a total of four bonds in the products.

To balance the equation, two nitric oxide molecules are needed to produce four nitrogen dioxide molecules. This means that during the reaction, two nitrogen-oxygen bonds are broken in the reactants, and four new nitrogen-oxygen bonds are formed in the products.

In summary, in the balanced reaction of the combustion of nitric oxide, two bonds are broken.

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use the formula M=n/V, where M=molarity, n=moles of solute, V= volume in litres

1.3M

0.02 mols

0.188 mols

0.062 mols

12 mols

While burning coal and charcoal, you notice that coal releases more heat than charcoal. This means that the chemical potential energy in coal is higher than that of charcoal.

Combustion or burning occurs when a substance reacts with oxygen. This reaction is highly exothermic and releases high amounts of energy in the form of heat, light and sound. The amount of energy released depends on the potential chemical energy stored in the substance.

Potential chemical energy is the energy stored in a combustible substance that gets converted to heat, light and sound energy while the substance burns. The more potential chemical energy a substance has, the more energy it expels while burning.

Hence, while burning coal and charcoal, coal will release more heat energy because its potential chemical energy is higher than that of charcoal.

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The student can claim: We can’t know for sure whether or not the mass changed, but it seems reasonable to claim that the mass did not change, given that the ranges of uncertainty overlap.

Since the student used the same electronic balance with an uncertainty of 0.05g to measure the mass of the solution before and after chemical reaction, the conclusion is that the masses are the same within the uncertainty of the balance.

+- value is uncertainty value of measurement.

Accuracy is the closeness of a measurement to the true value.

Balance is an instrument for comparing the mass of two bodies.

The percent error is an error between an observed value and the true value of a measurement.

Percent Error = (Actual Value - Estimated Value / Actual Value) × 100%

There are three types of error in chemistry: gross errors, random errors and systematic errors.

Missing options:

The mass definitely stayed the same because the measurement of 50.25 g was obtained each time.

The mass definitely stayed the same because the ranges of uncertainty overlap exactly.

We can’t know for sure whether or not the mass changed, but it seems reasonable to claim that the mass did not change, given that the ranges of uncertainty overlap.

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Answer:

it will be 60 day

Explanation:

These solutions used to calibrate a pH meter are known as pH buffer.

A buffer can be defined as a substance that prevents the pH of a solution from changing by either releasing or absorbing H⁺ in a solution.

Buffer is a solution that can resist pH change upon the addition of an acidic or basic components and it is able to neutralize small amounts of added acid or base, pH of the solution is relatively stable.

pH (potential of hydrogen) is a numeric scale used to specify the acidity or basicity of an aqueous solution:

When pH is less than seven (pH<7), solution is acidic.

When is equal seven (pH = 7), solution is neutral.

When pH is greater than seven (pH > 7), solution is basic.

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No, hurricane won't loose strength when the winds are strong.

It's because If wind conditions are okay, the storm becomes a hurricane. This heat energy is the energy for the storm. And the warmer the water, the further humidity is in the air. And that could mean bigger and stronger hurricanes.

Hurricanes increases their speed their strength because Warmer ocean face temperatures consolidate tropical storm wind pets.

These are the top 3 factors for hurricane development

Warm ocean water

Wind shear

humidity content

If hurricanes snappily lose strength as they move over land it's only because of the Friction with Land.

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Objective: To compare the efficacy of topical minoxidil 5% alone and combined topical minoxidil 5% and fractional laser in the treatment of male androgenic alopecia and detection of any side effects occurring with each line of treatment.

Patients and Methods: This prospective randomized comparative controlled study was conducted for one year on 40 patients with male androgenic alopecia attending our Patient. Patients were classified into two groups: Group A received minoxidil alone (minoxidil group) and group B where patients received minoxidil plus fractional CO2 laser.

Results: In groups A and B, there was a statistically significant improvement between the clinical assessment scale at baseline and after 1 month (p<0.001). Also, there was a statistically significant improvement between the clinical assessment scale after 1 month and after 3 months (p=0.002). In group A, there was a statistically significant improvement between the clinical assessment scale at baseline and after 1 month, however, there was no statistically significant improvement between the clinical assessment scale and after 3 months. In group B, there was a statistically significant improvement between the clinical assessment scale at baseline and after 1 month, however, also, there was a statistically significant improvement between the clinical assessment scale and after 3 months.

Conclusion: Our study revealed the superiority of combination therapy, using a fractional laser and 5% minoxidil, over 5% minoxidil alone, for the treatment of male AGA, with no serious adverse effects of treatment identified.

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The periodic table is an arrangement of the elements in order of increasing reactivity. The elements that are more reactive are found at the left hand side of the table among the metals. The reactive non metals are found at the right hand side of the table.

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Answer:

observations

Explanation:

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Answer:

57 mph 91.73 kph

58 mph 93.34 kph

59 mph 94.95 kph

60 mph 96.56 kph

is the answer

Explanation: