3. A slow starting reaction can sometimes be accelerated by crushing some of the magnesium in the flask with a glass rod. Why would this have any effect

If the hydrogen gas is combusted and produces 645L of water vapor at 400 kelvin and 1.75 atm, 2796.96 g mass of the zinc is produced .

Using the ideal gas law equation:

PV = nRT

n = (PV) / (RT)

= (1.75 atm * 645 L) / (0.0821 atm·L/(mol·K) * 400 K)

= 42.71 moles

the balanced equation for the reaction between zinc and hydrochloric acid:

Zn + 2HCl -> \(ZnCl_{2}\)  + \(H_{2}\)

1 mole of zinc produces 1 mole of hydrogen gas. Therefore, the moles of zinc are also 42.71.

The molar mass of zinc is 65.38 g/mol.

Mass of zinc = moles of zinc * molar mass of zinc

= 42.71 moles * 65.38 g/mol

= 2796.96 g

Therefore, the mass of the zinc is 2796.96 grams.

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The combine mass of the sled and the rider, given that each dog pulled with a force of 30 N is 200 Kg

We know that force is related to mass and acceleration according to the following formula:

Force (F) = mass (m) × acceleration (a)

F = ma

With the above formula, we can determine the combined mass of the sled and rider. Details below.

From the question given above, the following data were obtained:

The combined mass can be obtained as follow:

Force = mass × acceleration

240 = mass × 1.2

Divide both sides by 1.2

Mass = 240 / 1.2

Mass = 200 Kg

Thus, the combine mass is 200 Kg

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Answer:

Explanation:

Fossil fuels got their name because they are made from dead organisms, mostly plants that didn't decay because they were squashed under water or mud with no oxygen.

Answer:

becasue they are coming from both sides

Explanation:

The air masses gets lift up by the winds flowing in certain direction. Air masses collide when the air becomes humid and wind speed is greater.

Winds are passage of air from high pressure area to low pressure area. Air masses may travel from one place to another as a result of variations in air pressure. Air masses often move from high-pressure regions to low-pressure regions.

Winds therefore sweep away from high-pressure zones and toward low-pressure ones. The winds can moves the air masses in the atmosphere and the air masses collide in the clod and humid air.

Winds transfer meteorological conditions from the source location to the destination zone as they move air masses. The air mass may collide with another air mass that has a different temperature and humidity as it enters a new area. This may bring about a powerful storm.

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Answer

b. Oil, water, chloroform.

Explanation

Between water, chloroform, and oil, chloroform is the most dense substance (1.5 g/cm3), followed by water which has a density of 1.0 g/cm3. The least dense substance is oil with density of 0.9 g/cm3. Therefore, the oil will be at the top, followed by water, then chloroform will be at the bottom.

The fluids layered from top to bottom are oil, water and chloroform. Therefore, the correct option is option B.

A fluid is defined as a substance that has the ability to flow and conform to its surroundings. They can be found in both liquids and gases, among other forms. Liquids, like water, have a specified volume but no clear shape, whereas gases, like the air, have neither a specific volume nor shape. We need fluids to survive every day. Since water makes up the majority of the fluid in our bodies, they are essential for our survival. Fluids are also essential in many industrial processes, such as manufacturing, energy production, and transportation.

Therefore, the correct option is option B.

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Explanation:

2 moles of lead oxide ->

2PbO2 -> 2PbO + O2

Answer:

4-ethyl 2-methylhexan-3-one is the compound in the above picture

Answer:sample B is non metal

Explanation:

The dissociation of a weak acid like benzoic acid in solution is described by the equilibrium expression: \(HA < - > H^+ + A^-\)

where HA represents the undissociated acid, H^+ represents the hydrogen ions, and \(A^-\) represents the conjugate base. The concentration of dissociated acid, [\(H^+\)], can be related to the percent dissociation, %d, as follows:

\(\%d = ( [H^+] / [HA] ) \times 100%\)

If we assume that the dissociation is a small fraction of the initial concentration, then we can assume that \([HA] = [HA]0\), the initial concentration of the acid. This allows us to simplify the expression for %d as follows:

\(\%d = [H^+] / [HA]0 \times 100%\)

We know that the concentration of the \(2.4 \times 10^{-2}\) M solution of benzoic acid is 5.0% dissociated.

To find the concentration of the \(2.4 x 10^{-3}\) M solution,

we can use the relationship between the concentration and the percent dissociation:

\(5.0\% = [H^+] / (2.4 x 10^{-2} \:M) \times 100\%\)

\([H^+] = 5.0\% \times (2.4 x 10^{-2} \:M) / 100\%\)

\([H^+] = 1.2 x 10^{-3} \:M\)

Finally, to find the percent dissociation of the \(2.4 \times 10^{-3}\) M

solution, we use the expression for %d with [HA]0 \(= 2.4 \times 10^{-3}\) M:

\(\%d = [H^+] / [HA]0 \times 100%\\\)

\(\%d = (1.2 \times 10^-3 M) / (2.4 x 10^{-3} \M) \times 100%\\\)

\(\%d = 50.0%\)

Therefore, in a \(2.4 \times 10^{-3}\) M solution of benzoic acid, the percent of dissociation would be 50.0%.

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Note: the correct question would be as bellow,

A 2.4 x 10^-2 solution of benzoic acid is 5.0% dissociated. in a 2.4 x 10^-3 solution the percent of dissociation would be?

Answer:

Explanation:

C - Mix ice with water until equilibrium is reached but some ice remains that is no longer melting.

Answer:

the sewcond one bacteria are living organisms, but viruses are not

Explanation:

Answer:

Bacteria are living organisms, but viruses are not

Explanation:

Greenhouse gases act to increase temperatures by absorbing thermal infrared radiation.

We have already learned that Earth's atmosphere is composed often of nitrogen and oxygen. Those gases are transparent to incoming solar radiation. they may be also transparent to outgoing infrared radiation, which means that they do not take in or emit sun or infrared radiation.

The multiplied quantities of greenhouse gases human sports are adding to the environment have dissatisfied the balance that has been in location for the reason that ceases of the closing ice age, including greater greenhouse gases decreases the amount of infrared radiation energy leaving the atmosphere.

Greenhouse gases inside the ecosystem time and again absorb and re-radiate infrared radiation (warmth). strength radiated from Earth's surface as warmth, or infrared radiation is absorbed and re-radiated by using greenhouse gases, impeding the loss of warmth from our surroundings to area.

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Answer: A certain element exists as three different isotopes. 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average atomic mass of this element?

Explanation: A certain element exists as three different isotopes. 24.1% of all the isotopes have a mass of 75.23 amu, 48.7% have a mass of 74.61 amu, and 27.2% have a mass of 75.20 amu. What is the average atomic mass of this element? 74.92 amu. Use your periodic table to determine which element this is. As. An element exists

The average atomic mass of the element is 74.93 amu

Let the 1st isotope be A

Let the 2nd isotope be B

Let the 3rd isotope be C

From the question given above, the following data were obtained:

Abundance of A (A%) = 24.1%

Mass of A = 75.23 amu

Abundance of B (B%) = 48.7%

Mass of B = 74.61 amu

Abundance of C (C%) = 27.2%

Mass of C = 75.23 amu

The average atomic mass of the element can be obtained as follow:

= [(75.23 × 24.1)/100] + [(74.61 × 48.7)/100] + [(75.23 × 27.2)/100]

= 18.13043 + 36.33507 + 20.46256

Thus, the average atomic mass of the element is 74.93 amu

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The molecular structure of the covalent molecules, as well as the electron dot diagrams of hydrogen, ammonia, hydrochloric acid, water, and methane, are found in the attachment.

Covalent molecules are molecules that are formed by covalent bonds between two or more atoms of the same or different elements.

The inorganic elements hydrogen, fluorine, chlorine, water, and ammonia as well as all organic compounds are examples of molecules with covalent connections.

A covalent bond is formed when two atoms exchange one or more pairs of electrons. The two atomic nuclei are concurrently drawing these electrons to them. When the difference between the electronegativities of two atoms is too tiny for an electron transfer to take place to create ions, a covalent bond is formed.

In electron dot diagrams, the valence electrons of an atom are represented by dots that are positioned all around the symbol of the element.

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Answer:

Explanation:

Groundwater spread over the years

Answer:

it will have 6 valence electrons

it will gain electrons

charge will be 2-

Answer:

ok

Explanation:

Answer:

Yes it is balanced

Explanation:

You can check by finding the total of each element on both sides so:

Left Hand Side :

Carbons: 6

Oxygens: 6x2 (carbon dioxide) and 6 (water) so there are 18

Hydrogens: 6x2 (carbon dioxide) so 12

Right Hand Side:

Carbons: 6

Oxygens: 6 (glucose) then 6x2 (oxygen) so there are 18

Hydrogens: 12

The defining features of systemic radiation are:

A type of radiation therapy wherein the radioactive material would be ingested as well as inoculated through into body as well as travels through the bloodstream, identifying and destroying tumour cells. Systemic therapy refers to any cancer treatment which thus targets the entire body. Chemotherapy, for example, is a systemic chemotherapeutic agent that circulates all throughout body to eliminate abnormal cells in a variety of locations.

Systemic treatment refers to internal radiotherapy with such a liquid source. The term "systemic" makes reference to how the therapy travels through someone bloodstream to tissues all over your body, looking for and killing cancer cells. Systemic radiation therapy could be administered orally, intravenously (via an IV line), as well as intramuscularly (via injection).

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Answer:

5

Explanation:

Answer:

16.....................

Answer:

6 gallons of gasoline for $14.45 is the best price

Explanation:

26.29/11=2.39 $ per gallon

14.45/11=1.31 $ per gallon

NATO is described as the international entity experiences have been driving a harmonious support activity in Kosovo - the Kosovo Power (KFOR) - since June 1999.

KFOR was laid out when NATO's 78-day air crusade against Milosevic's system was pointed towards stopping viciousness in Kosovo, was finished.

The North Atlantic Arrangement Association also known as (NATO) completed an aeronautical bombarding effort against the Government Republic of Yugoslavia during the Kosovo War.

NATO sent off an air crusade Activity Associated Power, in Walk 1999 in order to stop the compassionate disaster that was then occurring in Kosovo. The choice to intercede followed by an extended period of battling inside the territory and the disappointment of worldwide endeavors to determine the contention by discretionary means.

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Jack needs less friction between his skis and the snow. Friction is the resistance that opposes the movement of two surfaces that are in contact.

In skiing, friction plays an important role in helping the skier move and turn. However, too much friction can make it difficult for the skier to move and control their direction. Therefore, Jack needs less friction between his skis and the snow to help him move more easily and control his speed and direction.

This is why skis are waxed regularly to reduce friction and help the skier glide over the snow smoothly.Therefore, it can be concluded that Jack needs less friction between his skis and the snow to move more easily and control his speed and direction.

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Answer:

Reaction time tests can be used to assess an individual's hand-eye coordination. One test involves catching a 1 metre ruler and measuring the distance, d in metres, that the ruler travelled before being caught. The reaction time t seconds is then calculated using the formula: = √2d/9.8

Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl

To calculate the concentration of NaCl in the resulting solution in mg/L NaCl, we can use the formula; Concentration (mg/L) = (Mass of solute ÷ Volume of solution in L) × 1000 g / 1 mg NaCl is present in the stock solution of 25 mL. So, the mass of NaCl in the solution would be;0.0842 g ÷ 25 mL = 0.00337 g/mL. Now, in the resulting solution, a 1.00 mL aliquot of the stock solution is transferred to a 50.00 mL volumetric flask and diluted to volume. Therefore, the volume of the resulting solution is 50.00 mL. We will substitute these values in the formula, Concentration (mg/L) = (0.00337 g/mL ÷ 50 mL) × 1000 g / 1 mg concentration (mg/L) = 67.4 mg/L. Therefore, the concentration of NaCl in the resulting solution in mg/L NaCl is 67.4 mg/L.7.  Concentration = 67.4 mg/LTolerance = 4.28 mg/LTotal concentration = 67.4 + 4.28 mg/L = 71.68 mg/LWe round off this value to one decimal place; Total concentration = 71.7 mg/LTherefore, the concentration of NaCl in the resulting solution using propagation of error through the calculation is 67.4+0.4 mg/L.8. Two possible sources of random (indeterminate) error in the experiment are; Errors in temperature measurement. Errors in measurement of water volume. Two possible sources of systematic (determinate) error in the experiment are; Incorrect calibration of volumetric glasswareIncorrect mass of NaCl.

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Answer:c

Explanation:

As the combined mass of the HCl and NaOH is 15 grams before the reaction. Therefore the mass after the reaction will be 15 grams according to the law of conservation of mass. Therefore, option (C) is correct.

Matter can be transformed form via physical changes and chemical changes from one form to another form, during any of these changes, the total mass is conserved. The same quantity of matter exists before and after the chemical or physical as none of the matter is created or destroyed.

The balanced equation between the reaction of HCl and NaOH:

\(HCl +NaOH \longrightarrow H_2O +NaCl\)

According to the law of conservation of mass, the mass of HCl and NaOH will be equal to the mass of the products water and NaCl.

As mentioned in the question the combined mass of HCl and NaOH measured before the reaction is 15 grams. Therefore, the mass of the products in the closed container will be equal to 15 grams as well.

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Your question was incomplete,  most probably the complete question was,

Fernando places 15 ml of HCl and 50 ml of NaOH in 100 ml of a beaker. He places them on a scale together and measures the combined mass of 15 grams.

After the HCl and NaOH react, Fernando measures the mass again. Using the mass before the reaction, what is the mass after the reaction? Remember, It is in a closed system.

A. 5.00 grams

B. 10.00 grams

C. 15.00 grams

D. 20.00 grams

Ozone is considered harmful in the troposphere but beneficial in the stratosphere. It is a pollutant in the troposphere but protects against UV radiation in the stratosphere.

In the stratosphere, ozone is thought to be advantageous but damaging in the troposphere. Ozone is a pollutant and a component of smog in the troposphere, which can harm crops and cause respiratory issues in people. Ozone, however, plays a crucial role in the stratosphere because it filters and absorbs dangerous UV light from the sun. This aids in shielding Earth's life from the negative effects of UV radiation. Lead, nitrogen oxides, and sulfur dioxide are also harmful in the stratosphere. They may all cause air pollution, acid rain, and other environmental issues and are all bad for the troposphere and stratosphere.

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Yes, that's correct. The chemical formula "\(BaCl_2\)" represents the ratio of the elements in the compound barium chloride. In this case, it means there is one barium (Ba) atom and two chlorine (Cl) atoms in each representative unit of the compound.

What is the chemical formula?

The term chemical formula has to do with the way that the atoms that compose the substance are arranged. The arrangement of the atoms in the chemical substance would help us to have an idea of how the compound appears.

Now we are looking at the compound barium chloride of which we know that it is an ionic subsnace and since the substance is ionic in nature, we would talk about a formula unit of the compound as beings its representative unit in the crystal lattice of the substance.

The question above is incomplete, the complete question is:

The formula for barium chloride is BaCl2. The chemical formula for barium chloride shows the number of ___________ of each element in the ___________ representative unit of the substance.

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The position of equilibrium lies far to the right, with products being favoured. Hence, option A is correct.

Chemical equilibrium is a condition in the course of a reversible chemical reaction in which no net change in the amounts of reactants and products occurs.

A very high value of K indicates that at equilibrium most of the reactants are converted into products.

The equilibrium constant K is the ratio of the concentrations of products to the concentrations of reactants raised to appropriate stoichiometric coefficients.

When the value of the equilibrium constant is very high, the concentration of products is much higher than the concentration of reactants.

This means that most of the reactants are converted into products and the position of equilibrium lies far to the right, with products being favoured.

Hence, option A is correct.

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Answer:

true I think not sure

Explanation: