which element is in the same "family" as chlorine (Cl) and fluorine (F)?
a. bromine (Br)
b. oxygen (o)
c. hydrogen (h)
d. lithium (Li)

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

To calculate the acid dissociation constant ([tex]K_a[/tex]) for a 0.015 M HA weak acid solution that is 2.5% dissociated, we use the concentrations of the ionized and non-ionized forms of the acid and plug them into the [tex]K_a[/tex] expression, which gives an approximate value of [tex]9.58 \times 10^{-6}[/tex].

To find the acid dissociation constant ([tex]K_a[/tex]) for the weak acid HA that is 2.5% dissociated in a 0.015 M solution, we can apply the definition of the dissociation constant. The dissociation of HA can be represented as:

HA <=> [tex]H^+[/tex](aq) + [tex]A^-[/tex](aq)

Since HA is a monoprotic acid and 2.5% dissociated, this means that:

0.025 x 0.015 M = [[tex]H^+[/tex]] = [[tex]A^-[/tex]]

0.015 M - 0.025 x 0.015 M = [HA]

We plug these values into the equation for [tex]K_a[/tex]:

[tex]K_a[/tex] = [[tex]H^+[/tex]][[tex]A^-[/tex]] / [HA]

By calculating the concentrations:

[[tex]H^+[/tex]] = [[tex]A^-[/tex]] = 0.000375 M (since 2.5% of 0.015 M)

[HA] = 0.015 M - 0.000375 M = 0.014625 M

Substitute them into the equation for [tex]K_a[/tex]:

[tex]K_a[/tex] = (0.000375 M × 0.000375 M) / 0.014625 M

This gives us:

[tex]K_a[/tex] = [tex]9.58 \times 10^{-6}[/tex]

So, the acid dissociation constant for HA is approximately [tex]9.58 \times 10^{-6}[/tex].

Answer:

0.00000001

0.000001

0.000001 : 1 or 1 : 100

Explanation:

answer on e2020

Answer:

The solution is always homogeneous mixture and transparent through which the light can travel. The mixture of water and sugar is a solution because sugar is soluble in water and form homogeneous mixture while the sand can not dissolve in water and sand particles scatter the light.

Explanation:

Solution:

"The solution is always homogeneous mixture and transparent through which the light can travel"

The mixture of water and sugar is a solution because sugar is soluble in water and form homogeneous mixture. The solubility of sugar is high as compared to the sand in water because the negative and positive ends of sucrose easily dissolve into the polar solvent i.e, water

Suspension:

"Suspension is the heterogeneous mixture, in which the solute particles settle down but does not dissolve"

The mixture of water and sand is suspension. The sand can not dissolve in water because it is mostly consist of quartz. The nonpolar covalent bonds of  sand are too strong and cannot be break by water molecules.

Taking into account the definition of avogadro's number, 0.21 moles of sulfur dioxide contain 1.26482×10²³ molecules.

Avogadro's Number or Avogadro's Constant is called the number of particles that make up a substance (usually atoms or molecules) and that can be found in the amount of one mole of said substance. Its value is 6.023×10²³ particles per mole. Avogadro's number applies to any substance.

First you must determine the number of moles that 13.5 g of sulfur dioxide contains. For that, I use the molar mass of the compound, which is defined as the amount of mass that a substance contains in one mole.

In this case, the molar mass of sulfur dioxide is 64 g/mole. So the number of moles that 13.5 grams of the compound contain can be calculated as:

[tex]13.5 gramsx\frac{1 mole}{64 grams} =[/tex] 0.21 moles

Then you can apply the following rule of three: if 1 mole of sulfur dioxide contains 6.023×10²³ molecules, then 0.21 moles contain how many molecules of sulfur dioxide?

amount of molecules of sulfur dioxide= (6.023×10²³ molecules× 0.21 mole)÷ 1 mole

amount of molecules of sulfur dioxide=1.26482×10²³ molecules

Finally, 0.21 moles of sulfur dioxide contain 1.26482×10²³ molecules.

Learn more about Avogadro's Number:

"It reacts with water" is incorrect I took the test and got it wrong. I believe it is B, because oxygen combines with glucose and makes carbon dioxide.

cellular respiration the starting compounds are glucose and oxygen and the ending compounds are carbon dioxide, water, and energy.

C6H12O6+6O2-->6CO2+6H2O+ energy

Glucose (sugar)+oxygen--> Carbon Dioxide+ water+energy

so It is one of the starting compounds

At standard temperature and pressure, burning hydrogen gas reacts with oxygen to produce water vapor in a ratio where 12 liters of oxygen would produce 24 liters of water vapor, according to the stoichiometric relationship in the chemical equation.

When hydrogen burns, water vapor is produced according to the balanced chemical equation . This tells us that 2 volumes of hydrogen react with 1 volume of oxygen to produce 2 volumes of water vapor. Therefore, if 12 liters of oxygen are consumed at STP (standard temperature and pressure), an equivalent stoichiometric ratio would apply, and hence 24 liters of water vapor would be produced, because the ratio of oxygen to water vapor in the equation is 1:2.

Answer:The correct answer is option A

Explanation:

The spraying of insecticides not only kills the insects harming the crops but also damages the fertility of the soil.

Development of new chemicals which are used as insecticides has polluted the soil with dangerous chemicals which are poisonous for living organism.

Extensive use of these chemicals has introduced these chemicals in the food chain and food web causing harm to living beings.

Final answer:

Eating too many lipids can lead to fat deposits that strain the body, unhealthy weight gain, increased risk of cardiovascular disease, and potentially hypervitaminosis due to excess accumulation of fat-soluble vitamins when consumed in large quantities.(Option C)

Explanation:

A negative result of eating too many lipids, specifically saturated fatty acids, trans fats, and cholesterol, is that fat deposits can put a strain on the body. Excessive intake of lipids can lead to an unhealthy weight gain and a rise in blood lipid levels, which in turn may increase the risk of health problems such as cardiovascular disease.

Conditions like atherosclerosis, where cholesterol contributes to the narrowing of arteries, can manifest as a result of high cholesterol levels. Moreover, while fat-soluble vitamins A, D, E, and K are absorbed with the help of dietary fats, an overabundance due to excessive lipid intake can lead to hypervitaminosis, a state where excess vitamins are stored in the body's fat.

Answer:

The relationship between initial temperature and final temperature is 2.

Explanation:

The reaction of:

HCl + NaOH → H₂O + NaCl + ΔH

Produce heat (ΔH). This heat is evidenced in the increasing of temperature in the system.

If you add 100 mL of 0,50M of both NaOH and HCl you will produce heat, that increase the temperature of the system in X°C.

Now, the addition of 200mL of 0,50M of both NaOH and HCl will produce twice the initial heat increasing the temperature of the system in 2X°C.

That means the relationship between initial temperature and final temperature is 2.

I hope it helps!

Agglutination reactions are used to locate the source of an epidemic because it is highly sensitive and may be used to detect the existence of antibody or antigen in a patient’s serum. Agglutination reactions are commonly used in the medical clinic. It can be used to identify the blood cells type for transfusion and to know the cultures of bacteria. It has been widely used to know if a patient had a bacterial infection.

Answer:

The agglutination reactions clinically exhibit a broad spectrum of applications. They facilitate in finding the existence of antibodies or antigens in the sample. The agglutination reactions can be used to find the epidemic source. This can be achieved by testing the blood sample of the patient.  

If the antibodies found in the sample of blood possess the tendency of undergoing agglutination with the disease-causing antigens, then it can be considered that the person has got encountered with the disease. In case of an epidemic, the samples of blood from the group of individuals is taken and examined for the agglutination reaction. Thus, the reaction can be used to find the source of the epidemic.  

An ideal gas is a theoretical concept used to understand gas behavior. Real gases do not behave exactly like ideal gases but can approach ideal behavior at low pressures. No ideal gases exist in the universe.

An ideal gas is a theoretical concept used to understand the behavior of gases. It is a hypothetical gas that obeys the ideal gas equation of state and follows the kinetic theory of gases.

No real gas behaves as an ideal gas, but at low pressures, gases tend to behave more like ideal gases.

There are no ideal gases in the universe as they are a theoretical construct and do not correspond to any real system.

Answer:

A

Explanation: Taking it now

Answer: This is induction - charged particles moving between positively and negatively charged parts of clouds

Percentage yield = (actual yield / theoretical yield) x 100%

The balanced equation for the reaction is,
    CH₄(g) + Cl₂(g) → CH₃Cl(g) + HCl(g)

Since there is excess of Cl₂ gas, we can assume that all of CH₄ gas are reacted.

Moles of CH₄(g) = mass / molar mass
                           = 25.0 g / 16 g/mol
                           = 1.5625 mol

The stoichiometric ratio between CH₄(g) and CH₃Cl(g) is 1 : 1

Hence moles of CH₃Cl(g) = 1.5625 mol

Molar mass of CH₃Cl(g) = 50.5 g/mol
 
Mass of CH₃Cl(g) = number of moles x molar mass
                             = 1.5625 mol x 50.5 g/mol
                             = 78.9 g
Hence theoretical yield = 78.9 g
Actual yield = 45.0 g

Hence,
 Percentage yield = (45.0 g / 78.9 g) x 100% 
                             = 57.03%

Option B: [tex]C_{n}H_{2n+2}[/tex]

Alkane is defined as series of hydrocarbons which are saturated (all the carbon-carbon bonds are single) for example: methane, ethane, propane etc.

In alkane, carbon has 4 valence electrons so, it can make single bonds with 4 hydrogen atoms.

In the series, the first alkane is methane, it has 1 carbon atom thus, 4 hydrogen atoms are attached to it and molecular formula becomes [tex]CH_{4}[/tex]. Similarly, the second alkane in the series is ethane, it has 2 carbon atoms, both attached with single bond. The remaining three electrons in each carbon are shared with 3 hydrogen atoms each thus, it has total of 6 hydrogen atoms. Molecular formula of ethane will be [tex]C_{2}H_{6}[/tex].

Now, for general formula, let the number of carbon atoms be n thus, number of hydrogen atoms will be [tex]2n+2[/tex]

Therefore, general formula of straight chain alkane is [tex]C_{n}H_{2n+2}[/tex].