Calculate the pH of 0.65 M H2SO4 (sulfuric acid) solution? (Ka2: 1.1x10-2)

Answer:

c

Explanation:

got it right on test

Oxygen will appear in the final equation as O2 reactant.

A chemical equations shows the interplay between reactants and products. The reactants are on the left hand side while the products are at the right  hand side.

Looking at the two equations, we know that oxygen will appear in the final equation as O2 reactant.

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The technique that would not be helpful in the separation of a mixture of sand and salt is O Magnet.

The combination of salt and sand may be separated via way of means of filtration observed via way of means of an evaporation process. Filtration can separate sand from a aggregate of sand and salt solution (salt dissolved in water). Sand remains at the clear out out paper as a residue after filtering. By boiling the filtrate, not unusualplace salt might also additionally now be produced. Probably the perfect approach to split the 2 materials is to dissolve salt in water, pour the liquid far from the sand, after which evaporate the water to get better the salt.

Thus, the correct option is magnet.

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Answer: C3H2O

Explanation: To find the empirical formula of the compound, we need to determine the simplest whole number ratio of atoms in the compound.

Assuming we have 100 g of the compound, we can convert the percentages to masses of each element:

Carbon: 66.7 g

Hydrogen: 3.74 g

Oxygen: 29.6 g

Next, we need to convert these masses to moles using the atomic masses:

Carbon: 66.7 g / 12.01 g/mol = 5.55 mol

Hydrogen: 3.74 g / 1.01 g/mol = 3.70 mol

Oxygen: 29.6 g / 16.00 g/mol = 1.85 mol

Now we need to divide each of these mole values by the smallest of the three:

Carbon: 5.55 mol / 1.85 mol = 3.00

Hydrogen: 3.70 mol / 1.85 mol = 2.00

Oxygen: 1.85 mol / 1.85 mol = 1.00

These ratios give us the empirical formula:

C3H2O

However, we can simplify this formula by dividing each subscript by 2:

C1.5H1O0.5

Finally, we can multiply through by 2 to get rid of the decimals:

C3H2O

1) Chemical equation.

2) Types of reaction.

Synthesis: a compound is made from simpler materials.

Decomposition: a compound is broken down into simpler compounds.

Single replacement: one element that starts out by itself replaces another element in a compound.

Double replacement: positive and negative ions in two compounds switch places.

Combustion: a compound containing Carbon and Hydrogen combines with Oxygen gas and produces carbon dioxide and water.

3) The chemical equation above is a double displacement where H+ and Na+ switch places.

.

Answer:

D

Explanation:

D because scientists study cells to know how to help people when they are sick

hope this helps (it might be wrong)

Answer:

c

Explanation:

I think I remember this from last year

Answer:

1.475ml

Explanation:

We add 273 to °C to convert it to kelvin

Answer:

its sodium hydroxide

Explanation:

Answer:

causes eclips of the sun

Answer:

Explanation:

The density of a substance can be found by using the formula

\(density = \frac{mass}{volume} \\\)

From the question

mass = 4 g

volume = 2 cm³

We have

\(density = \frac{4}{2} \\ \)

We have the final answer as

Hope this helps you

Answer:

hot to cold matter

a) To calculate the minimum frequency of electromagnetic radiation required to release electrons from the metal, you can use the following formula:

f = W / h

where f is the minimum frequency of electromagnetic radiation required, W is the work function of the metal in joules, and h is the Planck constant in joules per second.

Plugging in the values for W and h, you get:

f = (5.86 x 10^-19 J) / (6.626 x 10^-34 J/s) = 8.9 x 10^14 Hz

This is the minimum frequency of electromagnetic radiation required to release electrons from the magnesium metal.

b) To calculate the kinetic energy of the ejected electronic light of frequency 2.00 x 10^14 Hz, you can use the following formula:

KE = hf - W

where KE is the kinetic energy of the ejected electron, h is the Planck constant in joules per second, f is the frequency of the electromagnetic radiation in hertz, and W is the work function of the metal in joules.

Plugging in the values for h, f, and W, you get:

KE = (6.626 x 10^-34 J/s) * (2.00 x 10^14 Hz) - (5.86 x 10^-19 J) = 1.32 x 10^-19 J - 5.86 x 10^-19 J = -4.54 x 10^-20 J

This is the kinetic energy of the ejected electron when light of frequency 2.00 x 10^14 Hz is used to irradiate the magnesium metal. Since the kinetic energy is negative, this means that the electron is not released from the metal when irradiated with this frequency. The frequency of the electromagnetic radiation needs to be higher than the minimum frequency required to release the electron in order for the electron to be ejected from the metal.

The answers to all these questions are given as following:

1) A hybrid is an organism that results from the cross-breeding of two different species or sub-species.

2) Different traits observed within a species are most likely due to genetic variations caused by mutations, gene flow, genetic drift, or natural selection.

3) The genetic makeup and environmental factors make humans different from each other. However, humans are similar in many ways, including having the same basic biological processes and functions, the ability to communicate and form social groups, and the capacity for complex thinking and emotions.

4) Genetic variations caused by mutations, gene flow, genetic drift, or natural selection are responsible for variation among the same species.

5) Humans have approximately 20,000-25,000 genes inside their cells.

6) To determine which species are most closely related at the genetic level, genetic analysis such as DNA sequencing or protein analysis can be used to compare the genomes of different species and determine the degree of similarity between them.

7) The main ideas behind why organisms are different are genetic variations caused by mutations, gene flow, genetic drift, or natural selection, which can lead to differences in physical and behavioral traits, and adaptations to different environments.

8) The more genes two species have in common, the more similarities they will have because genes are responsible for determining traits and functions in organisms.

9) Genetic similarities move from parents to offspring through the transmission of genetic material (DNA) during sexual or asexual reproduction.

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Answer:

Trees

Explanation:

I think sorry if I get it wrong

Answer:

B not really sure tho :)

Explanation:

Answer:

3

Explanation:

The amount of mass per given vol

Answer:

We need more? What else is in the question? This is unanswerable.

Explanation:

Explanation:

The rate of a reaction is defined as the rate of disappearance of reactants in a reaction or the rate of conversion of appearance of products during a reaction.

The rate of a reaction depends on the concentration of the reactants, the temperature of the reaction, the nature of reactants, and the presence or absence of catalysts during the reaction.

The surface of reactants comes into play. Reactants with high surface areas react faster than reactants with fewer surface areas. Hence, powdery reactants react faster than solid reactants.

Answer: C. The powdered magnesium react faster because it has a greater surface area.

Answer:

unconsolidated material that contains nutrient matter and weathered rock

Explanation:

Earth's crust is made up of many layers. The top is soil, which provides the most nutrients for plants, like hummus( The organic nutrient for soil, form from the decaying of plants and animals)

The soil gets its texture from the bedrock, the bottom layer, which weathers, and goes into the soil.

-kiniwih426

On average, the total mass of ions in 4.75 liters of Mackenzie River water is 0.466 g grams.

The formula mass of an ionic compound is determined in the same manner as the formula mass of a covalent compound is determined: by adding the average atomic masses of all the atoms in the compound's formula.

Hence, the total mass is computed as follows:

(0.820 mM Ca 2⁺) X ( 2.25 L) = 1.845 mmoles at 40.0 g/mol = 73.8 mg

(0.430 mM Mg 2⁺) X ( 2.25 L) = 0.9675 mmoles at 24.3 g/mol = 23.51 mg

(0.300 mM Na⁺) X ( 2.25 L) = 0.675 mmol at 23.0 g/mol = 15.52 mg

(0.0200 mM K⁺) X ( 2.25 L) = 0.045 mmol at 39.1 = 1.75 mg

(0.250 mM Cl-) X ( 2.25 L) = 0.5625 mmol at 35.45 g/mol = 19.94 mg

(0.380 mM SO₄²-) X ( 2.25 L) = 0.855 mmol at 96.06 g/mol = 82.13 mg

(1.82 mM HCO₃ -) X ( 2.25 L) = 4.095 mmol at 61.02 g/mol = 249.87 mg

Thus, total mass = 73.8 + 23.51 + 15.52  + 1.75 + 19.94 + 82.13 + 249.87

= 466.52mg

Converted into grams  we have:
466.52/1000

= 0.46652

Hence, on average, the total mass of these ions 4.75 L \(\approx\) 0.47 grams.

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Answer:

True if by rifting you mean continental rift. If not idk.

Answer:

Aluminium can dissolve in HCl

6HCl + 2Al ---> 2AlCl₃ + 3H₂

Minimum volume of HCl required is 76.9 mL.

Explanation:

When a metal dissolves in an acid, a chemical reaction takes place. The chemical reaction occuring is the displacement of the hydrogen ions present in the acid by the metallic ions formed when the metal dissolves in the acid. The displaced hydrogen ion accepts electrons frommthe metal and is evolved as hydrogen gas.

The ability of a metal to be dissolve in an acid with the resultant evolution of hydrogen gas is determined by the position of the metal in the electrochemical series. Metals which are above hydrogen in the electrochemical series are able to displace hydrogen from dilute acids and as such, dissolve in the acid. However, metals which are lower than hydrogen in the electrochemical series are not able to displace hydrogen from dilute acids and as such are not soluble in the acids.

Of the three metals, aluminium, Al, copper, Cu, and silver, Ag, only aluminium is higher than hydrogen in the electrochemical series and as such can dissolve in the 3.25 M HCl.

The equation of the reaction is given below:

6HCl + 2Al ---> 2AlCl₃ + 3H₂

Molar mass of Al = 27 g; Mass of Al reacting = 2.25 g

Number of moles = mass/molar mass

Number of moles of Al present in 2.25 g = 2.25/27 = 0.083 moles

From the equation of reaction, 6 moles of HCL are required to react with 2 moles of Al.

Number of moles of HCl required to react with 0.083 moles of Al = 0.083 × 6/2 = 0.25 moles of HCl

From the formula, molarity = number of moles / volume; volume = number of moles / molarity

Molarity of HCl = 3.25 M; number of molesnof HCl = 0.25 moles

Volume = 0.25 / 3.25 = 0.0769 L or 76.9 mL

Therefore, minimum volume of HCl required is 76.9 mL.

The correct rate law of the reaction from the experimental data is k[NO]^2 [O2]. Option D

The rate of reaction is usually expressed in terms of the amount of reactant consumed or product formed per unit time, and is typically measured in units of moles per liter per second (mol/L/s) or similar units.

We have that;

For NO;

3.4 * 10^-5/8.4 * 10^-6 = 2 * 10^-4/ 2 * 10^-4

4 = 2^n

n = 2

For O2;

8.4 * 10^-6/2.8 * 10^-6 = 3 * 10^-4/ 1 * 10^-4

3 = 3^n

n = 1

Thus the rate law of the reaction is;

Rate = k[NO]^2 [O2]

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Answer: 5,266

Explanation:

5,266

Erosion by water during the rainy season can be a significant natural phenomenon. When it rains, water flows over the land, picking up soil particles and carrying them along with it.

Water is a clear, colorless, odorless, and tasteless liquid that is essential for life. It is a chemical compound made up of two hydrogen atoms and one oxygen atom, with the chemical formula H2O. Water is the most abundant substance on Earth, covering approximately 71% of its surface.

Water is a unique substance because of its molecular structure, which allows it to exist in all three physical states - solid, liquid, and gas - at temperatures and pressures commonly found on Earth. It has a high heat capacity, meaning it can absorb and release large amounts of heat without changing temperature significantly. This property is important for regulating the Earth's climate and for maintaining the temperature of living organisms.

Water is essential for many biological processes, such as hydration, digestion, and metabolism. It also plays a crucial role in the Earth's water cycle, where it evaporates from bodies of water and plants, condenses into clouds, and falls back to the surface as precipitation.

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A volcano can be defined as an opening on the surface of a planet that allows material warmer than surroundings to escape from its interior. Therefore, option (B) is correct.

A volcano can be described as an opening in the earth's crust through which lava, volcanic ash, and gases escape from its interior. When this material escapes, then eruptions can be calmer, with gentle flows of material, or can be explosive, sending material high into the sky.

When pieces of Earth's crust slowly move away from each other, magma can rise. The magma rises to fill in space and underwater volcanoes can form.

The tectonic plates can also move toward each other when magma rises. The part of Earth's crust can be forced deep into its interior which can cause the crust to melt and rise as magma.

The magma can also rise over hot spots. Hot spots can be defined as the hot areas inside of Earth where magma heats up and becomes less dense. With each way of rising the magma can form volcanoes.

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The total number of atoms for each element in a chemical equation that is balanced is the same on both sides of the equation.

An equation for a chemical reaction is said to be balanced if both the reactants and the products have the same number of atoms and total charge for each component of the reaction.

For the chemical equation to adhere to the rule of conservation of mass, it must be balanced. A chemical equation is said to be balanced when the number of various elemental atoms on the reactants and products sides are equal.

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