Please help
3) a student claims that the reaction of hydrogen and oxygen to form
water is evidence supporting the claim that mass is conserved in a
chemical reaction. the chemical equation the student uses for the reaction
is h2 + o2 --> h2o. does this evidence support the claim? why or why not?*

a.) yes, it supports the claim because all the elements in the reactants appear in the
product.

b.) no, it does not support the claim because it is not a closed system.

c.) yes, it supports the claim because the reaction equation is balanced.

d.) no, it does not support the claim because the reaction equation is not balanced.

Answer:

energy disturbance easy

The distance moved by the solvent is 9.5 cm.

Given,

Rf value of yellow dye = 0.60

Distance moved by yellow distance = 5.7 cm

To calculate,

Distance moved by the solvent =?

We know that the Rf value in chromatography is calculated as:

Rf = distance moved by the solute/ distance moved by the solvent

Putting the given values in the above formula, we get

0.60 = 5.7/ distance moved by solvent

Distance moved by the solvent = 5.7/0.60

Distance moved by solvent = 9.5 cm

The ratio of the analyte's (solute) distance traveled to the solvent front on a chromatogram is known as the retention factor (Rf) value.

When using mobile solvents, analytes move differently depending on the type of chromatographic procedure used to transfer them to the stationary phases. The differences between analytes' affinity for stationary and mobile solvents are what cause this difference. The longer an analyte is in place, the lower its Rf value will be, and vice versa, depending on its relative affinity with a stationary phase.

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Answer:

Pure water is a non conductor of electricity and dilute acids in their aqueous solutions form free ions, which conducts electricity. Thus when we need to electrolyse water, a dilute acid is added to increase its conductivity.

Answer:

mineral

Explanation:

Because every natural thing has mineral

Answer:

Earth

Explanation:

The value of b in the equation \(\( f(t) = 85 \cdot b^t \)\) represents the decay factor of the radioactive substance. To determine the value of \( b \), we can use the information that the half-life of the substance is 21 years.

The half-life of a radioactive substance is the time it takes for half of the substance to decay. In this case, the half-life is 21 years, which means that after 21 years, the amount of the substance remaining will be half of the initial amount.

We can use this information to set up an equation:

\(\(\frac{1}{2} = b^{21}\)\)

To solve for b, we need to take the 21st root of both sides of the equation:

\(\(b = \left(\frac{1}{2}\right)^{\frac{1}{21}}\)\)

Using a calculator, we can evaluate this expression:

\(\(b \approx 0.965\)\)

Therefore, the value of b in the equation \(\( f(t) = 85 \cdot b^t \)\) is approximately 0.965.

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The IUPAC name for the following compound is 5,5-dimethylhept-2-yne.

The IUPAC name for the following compound is "5,5-dimethylhept-2-yne." The other compound names are:

3,3-dimethyl-5-heptyne

Methyl isohexyl acetylene

1,4,4-trimethylhex-2-yne

Pseudocumene, also referred to as 1,2,4-trimethylbenzene, is an organic molecule having the chemical formula C6H3(CH3)3. It is a flammable, colourless liquid with a potent odour that is categorised as an aromatic hydrocarbon. While soluble in organic solvents, it is almost insoluble in water. About 3% of coal tar and petroleum naturally contain it. It is one of the three trimethylbenzene isomers.

During the petroleum distillation process, it is separated from the C9 aromatic hydrocarbon fraction for industrial use. This fraction contains 1,2,4-trimethylbenzene to a degree of about 40%. Additionally, it is produced through the disproportionation of xylene over aluminosilicate catalysts and the methylation of toluene and xylenes.

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Answer:Crystalline solids have well-defined edges and faces, diffract x-rays, and tend to have sharp melting points. In contrast, amorphous solids have irregular or curved surfaces, do not give well-resolved x-ray diffraction patterns, and melt over a wide range of temperatures.

Explanation:

Answer:

:-::-::

Explanation:

The work done by the gas for question A will be 4.2 * 10^5 J.

The change in internal energy of the gas for question B is 6.43 * 10^5 J.

For a gas, it is the product of the pressure P and the volume V during a change of volume. The formula for work done in gas is W (work) = P (pressure) * V (volume)

Now, let's calculate the work done by gas to answer question A.

Work = Pressure * (Volume 2 - Volume 1)

= 1 atm * (16.2 - 12)

= 10^5 Pa * 4.2

= 4.2 * 10^5 J

So the work done by the gas is 4.2 * 10^5 J.

Now, let's find the change in internal energy of the gas.

The heat energy added to the system is

Q = 254kcal

= 254kcal * (4184J / 1 kcal)

= 1.063 * 10^6 J

The change in internal energy of gas is

ΔU = Q (the heat energy added) - W (work done by gas)

= 1.063 * 10^6 J - 4.2*10^5 J

= 6.43 * 10^5 J

Therefore, the change in internal energy of the gas is 6.43 * 10^5 J

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Answer:

The element that has the same number of valence electrons as bromine (Br), is chlorine (Cl).

Explanation:

Answer:

They have the same number of atoms

Explanation:

The mole (symbol: mol) is the base unit of amount of substance.

Think of mole meaning like inch. An inch of grass is the same as an inch of a flower. Mole is the standard measuring unit of atoms.

Answer:

it drops?

Explanation:

Isotopes are variants of a particular chemical element that have the same number of protons but different numbers of neutrons in their atomic nuclei.

Therefore, they have different atomic masses. The atomic mass of an element is the weighted average of the masses of its isotopes, taking into account their relative abundances.
So, if we have four isotopes of a hypothetical element with their respective atomic masses and abundances, we can calculate the atomic mass of the element. Let's assume that the isotopes and their abundances are as follows:
Isotope 1: Atomic mass = 20, Abundance = 10%
Isotope 2: Atomic mass = 21, Abundance = 20%
Isotope 3: Atomic mass = 22, Abundance = 30%
Isotope 4: Atomic mass = 23, Abundance = 40%
To calculate the atomic mass of the hypothetical element, we need to multiply the atomic mass of each isotope by its relative abundance, then add up the products. This gives us:
(20 x 0.1) + (21 x 0.2) + (22 x 0.3) + (23 x 0.4) = 2 + 4.2 + 6.6 + 9.2 = 22

Therefore, the atomic mass of the hypothetical element is 22.

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Answer:

There are no options but the question can be answered based on general understanding of experimentation.

Group A: Control group

Group B: Experimental group

Explanation:

In an experiment, there are two groups viz: the control group and the experimental group. A control group is the group that does not receive any experimental treatment. It is considered the normal group while the experimental group is the group that is subjected to experimental treatment.

N.B: The experimental treatment in this case is the "Oxygen level"

According to the question, out of 20 petri-dishes used to grow bacteria, half (10) of the petri-dishes were placed in a container with normal atmosphere while the other 10 petri-dishes were placed in another container that have double the normal oxygen level. The first group of bacteria labelled GROUP A are the CONTROL GROUP because they were not given any treatment i.e placed under normal conditions while GROUP B are the EXPERIMENTAL GROUP because they are the group that received the experimental treatment (increased oxygen level).

I don't know

Explanation:

because it does not give an question

In a galvanic cell, the reaction proceeds towards the production of products.  ΔG starts < 0, becomes more negative

Option B is correct .

As the reaction proceeds, the Gibbs free energy (ΔG) reduces, and the following are true:  ΔG starts < 0, becomes more negative.

When the reaction in a galvanic cell proceeds towards the production of products, the Gibbs free energy starts with a negative value, and it becomes even more negative.

The Gibbs free energy (ΔG) is a measure of the available energy in a system that can be used to do work. It measures the difference between the free energy of the final state and the initial state.The Gibbs free energy change of a system is dependent on the enthalpy and entropy change. If the enthalpy change is negative (exothermic), and the entropy change is positive (disorderly), the Gibbs free energy change is negative, and the reaction is spontaneous.

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\({ \red{ \underline{ \tt{Langmuir \: adsorption \: isotherm:}}}}\)

The defect of Freundlich adsorption isotherm is that it fails at high pressure of the gas.

Langmuir derived the adsorption isotherm based on the theoretical considerations. It is generally applied to chemical adsorption.

It can be expressed as

\({ \blue{ \bold{ \frac{X}{m} = \frac{AP}{1+BP}}}}\)

where,

X = mass of the gas adsorbed

M = mass of the adsorbent

P = equilibrium pressure

The molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).

To calculate the molarity of the KMnO4 solution, we need to use the stoichiometry of the reaction and the volume of the KMnO4 solution used in the titration.

Given:

Mass of H2O2 solution = 1.0 g

Concentration of H2O2 solution = 30 wt% (weight percent)

Volume of KMnO4 solution used = 22.143 mL

Molar mass of H2O2 = 34.01 g/mol

Step 1: Calculate the moles of H2O2 in the solution.

Moles of H2O2 = (Mass of H2O2 solution) / (Molar mass of H2O2)

= 1.0 g / 34.01 g/mol

= 0.0294 mol

Step 2: Calculate the moles of KMnO4 based on the stoichiometry of the reaction.

According to the balanced equation, the ratio of KMnO4 to H2O2 is 2:5.

Therefore, moles of KMnO4 = (Moles of H2O2) * (2/5)

= 0.0294 mol * (2/5)

= 0.01176 mol

Step 3: Calculate the molarity of the KMnO4 solution.

Molarity (M) = (Moles of KMnO4) / (Volume of KMnO4 solution in liters)

= 0.01176 mol / 0.022143 L

= 0.5316 M

Therefore, the molarity of the KMnO4 solution is 0.532 M (rounded to three decimal places).

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When a predetermined level of ionization is reached in an ionization chamber, the machine typically triggers a response or action based on the intended purpose of the device or system.

The specific action taken can vary depending on the application and design of the machine. Here are a few examples;

Radiation Monitoring; In radiation monitoring devices or systems, an ionization chamber is often used to detect and measure radiation levels. When the ionization chamber detects a predetermined level of ionization, it may activate an alarm or warning signal to alert operators or individuals of potentially hazardous radiation exposure.

Particle Detection; Ionization chambers are also used in particle detectors to measure the passage of charged particles. When a predetermined level of ionization is reached, the machine may initiate data recording or trigger further analysis of the detected particles.

Feedback Control; In certain industrial or scientific processes, ionization chambers are integrated into feedback control systems. When the ionization level reaches a set threshold, the machine may automatically adjust process parameters, such as flow rates, voltage, or radiation shielding, to maintain a desired condition or response.

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Answer:

Microclimates

Explanation:

Microclimates are small areas with climate conditions that differ from those around them. The main factors that influence temperature are latitude, altitude, distance from large bodies of water, and ocean currents. Earth's surface is divided into three temperature zones.

Answer:

The molar mass of a substance is calculated as the mass of a given chemical compound or substance, which is then divided by the amount of the substance. The mass is calculated in grams and the amount of the substance is calculated in mol. Thus, the standard unit for molar mass is g/mol.

Explanation:

According to the given question, the reaction between iron chloride and sodium carbonate will be given as:  

\(\text {3Na_{2}CO_{3}\text} \;\[+\] \;\text{ 2FeCl_{3} \text}\; \rightarrow\; \text {6NaCl}\; \[+\] \;\text { Fe_{2} (CO_3)_{3} \text}\)

Now, to calculate the mass of iron carbonate formed in the above chemical reaction, it will be given as:

\({ \text Moles\;of}\text \;\text {FeCl_{3} \text} \[=\dfrac{0.15 \;\text {moles} \times 0.015\; \text L}{1.0 { \;\text L}\text}\)

                          \(=\;0.00225\; \text {moles}\text\)

Similarly, for sodium carbonate

\(\text Moles\; of\; Na_{2}CO_{3}}\te \[=\]\dfrac{0.15 \;\text {moles} \times 0.020\; \text L}{1.0 { \;\text L}\text}\\\)

                             \(\[=\]\;0.0003\; {\text moles \text}\)

Limiting reactant is \(\text {FeCl_{3} \text}\)

Now, calculating iron chloride mass:

\(=\dfrac{0.00225 \times 1\;\text{moles}\;\text{Fe}_2 {(\text{CO}_3)}}{2\;\rm{moles\;of\;}Fecl_3}\)

\(=0.001125 \;\text {moles }\)

Now, molar mass of the \(\text{Fe}_{2}\text{CO}_{3}\)  will be  \(=291.71679\;\text{g/ mol}\)

\(\begin{aligned}\text{Mass}&=\frac{\text{Moles}}{\text{Molar mass}}\\\\&=\frac{0.001125\;\text{moles}}{291.71679\; \text{g/mol}} \\\\&=3.85648\times10^{-6} \end{aligned}\)

The species would be an anuran (an amphibian)

We need to answer this in English.

Here we want to find "A species that mates on the surface and then deposits its eggs in the water to be surrounded by sperm"

This would be known as a species of amphibian called an anuran, specifically a frog or toad.

Frogs and toads belong to the order Anura and have a characteristic reproductive cycle that involves external fertilization. During reproduction, the male releases his sperm into the water, and the female deposits her eggs in the water as well. The eggs are externally fertilized by sperm that swim around them. This process is known as external or external fertilization.

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Answer:

Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level.

Elements: Argon

in the right side of the periodic table . It is group 18 called nobel gas or group This group has all element in stable form each has 8 electron in outermost orbit they are non reactive

The rate at which the tank is filled in gallons per second is 3 gallons per minute.

In this question, we are supposed to calculate the rate at which the tank is filled in gallons per second and cubic meters per second. Additionally, we also need to determine the time interval required to fill a 1.00−m3 volume at the same rate.

A) The time required to fill the tank is 5.00 min and the tank is 15.0-gallon. Therefore, the rate at which the tank is filled in gallons per second is given by;

Rate = 15.0 gal / 5.00 min

= 3 gal / min.

Now, to calculate the rate at which the tank is filled in cubic meters per second, we first convert the gallons to cubic inches, then to cubic meters.

B) 1 US gallon = 231 cubic inches, and 1 cubic inch = 0.0254 m³

Therefore, the rate at which the tank is filled in cubic meters per second is;

Rate = (3 gal/min) * (231 in³/gal) * (0.0254 m/in)³ = 0.00794 m³/s

C) To determine the time interval required to fill a 1.00−m3 volume at the same rate, we can use the rate calculated in part (b). Thus,

Time = (Volume) / (Rate)

= 1.00 m³ / 0.00794 m³/s

= 125.7 s = 2.09 hr

Thus, the rate at which the tank is filled in gallons per second is 3 gallons per minute, the rate at which the tank is filled in cubic meters per second is 0.00794 m³/s, and the time interval required to fill a 1.00−m3 volume at the same rate is 2.09 hours.

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Steel ball bearings and marbles can be separated through manual sorting due to their difference in appearance.

Before answering the question, let us define the given choices.

The given separation techniques are not suitable for the separation of steel balls bearings, and marbles. Instead, the sorting separation technique must be used. This is used for manually sorting coarse materials based on their physical characteristic, which in this case is their difference in appearance.

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