a is a solid, naturally occurring, cohesive substance composed of minerals or mineral-like materials. a. tetrahedron b. rock c. mineral d. mixture

Answer:

3.38 x 10⁴cm³

Explanation:

Given that:

      Volume of the substance  = 3.83 x 10⁷mm³

The problem entails use to convert from mm³ to cm³;

                    1000mm³   = 1cm³

So;

          3.83 x 10⁷mm³ will produce \(\frac{ 3.83 x 10^{7} }{1000}\)    = 3.38 x 10⁴cm³

Answer:

3.25 moles of H2O

Explanation:

We'll begin by writing the balanced equation for the reaction. This is given below:

2HCl + Ca(OH)2 —> CaCl2 +2H2O

Now, we can obtain the number of mole H2O produced from the reaction as follow:

From the balanced equation above,

2 moles of HCl reacted to produce 2 moles of H2O.

Therefore, 3.25 moles of HCl will also react to produce 3.25 moles of H2O.

Therefore, 3.25 moles of H2O were produced from the reaction.

Answer:

molecules are bigger than phosphorus molecules, and thus the van der Waals attractions are stronger, leading to a higher melting and boiling point.

The boiling point of chlorine is higher than argon because the atoms within the argon element are held together by a very weak van der Waals force of attraction.

The Boiling point may be defined as the temperature at which the pressure exerted by the surroundings upon a liquid is equaled by the pressure exerted by the vapor of the liquid.

The attraction between the atoms of argon is typically weaker than those present in the atoms of chlorine. This is due to the smaller argon atoms. So, very little energy is required in order to break them. The differences in size are directly related to the boiling point of the molecule.

Therefore, the atoms within the argon element are held together by a very weak van der Waals force of attraction due to which the boiling point of chlorine is higher than argon.

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Answer:

6.9 ml of concentrate

Explanation:

100 ml   of .1 M   will require .01 moles

from a 1.45 M solution,  .01 mole would be

  .01 mole / ( 1.45 mole / liter) = 6.9 ml of the concentrate   then dilute to 100 ml

The ion that has 26 protons, 28 neutrons, and 24 electrons is Iron (Fe) (option c).

An element can be determined by the number of protons in the nucleus of its atom. The number of protons present in an atom is referred to as the atomic number of the element.

This means that the number of protons in an atom is unique to a specific element.

Iron (Fe) has 26 protons in the nucleus of its atom.

Therefore, an ion with 26 protons is an ion of the element iron (Fe).

Magnesium (Mg) has 12 protons, Chromium (Cr) has 24 protons, Xenon (Xe) has 54 protons and Nickel (Ni) has 28 protons.

Thus, an ion which has 26 protons, 28 neutrons, and 24 electrons  is Fe (option c)

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2.50 litres of a 10.0 M solution require the preparation of 25.0 moles of ethylene glycol.

Excellent antifreeze, anti-boil, and anti-corrosive qualities are produced when antifreeze and water are mixed in a 50/50 ratio. The proportion of conventional ethylene glycol to water in severely cold conditions can reach 70% antifreeze, 30% water. The maximum antifreeze to water ratio when using DEX-COOL® is 60/40.

moles = concentration (M) x volume (L)

Given that the desired concentration is 10.0 M and the volume needed is 2.50 L, the setup for calculating the total number of moles of ethylene glycol can be written as:

moles = 10.0 M x 2.50 L

moles = 25.0 mol

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Answer:

The baker would only be able to make 4 cupcakes each having 3 cherries on it.

Explanation:

Since the focus is on cherries you can ignore the cupcakes. So if you have 12 cherries and 3 PER cupcake you divide. 12 by 3 to get 4. Even though there will be one cupcake left, they could always give it to me! lol

Hope this helps and have a great day!

Answer:

4

Explanation:

Answer:

Organisms change their behavior in response to changes in the surrounding environment.

Explanation:

All living things can respond to stimuli in the exterier environment, It is a form of energy—light waves or sound vibrations, From what they sense they will make neccisary changes to their diet and or where they are located.

Such as winter weather which is a type of stimulus will cause some animals to start hibernating.

Answer: Hope it can help you :)

Explanation:

Answer:

Its physical structure

Explanation:

Answer:

It shows that the mountain may have once been under water and was raised by natural processes. Maybe

The fossil provide scientists about the way this area might have changed over time, the evidence It shows that the mountain may have once been underwater and was raised by natural processes.

Any surviving remnants, impression, or evidence of a once-living creature from a previous geological epoch is referred to as a fossil. Examples include fossilized bones, shells, exoskeletons, animal or microbe impressions in stone, amber-preserved artifacts, hair, petrified wood, oil, coal, and DNA traces.

There are four basic categories of fossils, each generated in a unique method and useful for conserving various kinds of animals. These include genuine form fossils, trace fossils, mold fossils, and cast fossils.

Usually, sedimentary rocks include fossils, however rarely, low-grade, fine-grained metamorphic rocks will as well. Sometimes, after the fossils have been removed, the surrounding rock has developed molds.

Thus, option D is correct.

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Answer:due to unequal heating

Explanation:

1) Write the formula

2) The subscripts show us the number of each atom in the formula. In this case, we also have to make sure to count the parenthesis subscript.

There are

3 Cu

2 P

8 O

Answer:

Explanation:

However, the model was misleading in several ways and ultimately destined for failure. The maturing field of quantum mechanics revealed that it was impossible to know an electron's position and velocity simultaneously. Bohr's well-defined orbits were replaced with probability “clouds” where an electron is likely to be.

Answer: To remedy the stability problem.

Explanation:Bohr modified the rutherford model by requring that the electrons move in orbits of fixed size and energy. Of an electron depends on the size of the orbit and is slower for smaller orbits  

Hope this helps

Answer:

What is the name of the lab tool that is used to transfer a sample to a microscope slide?

A-a dropper

C-scissors

D-a ruler

Explanation:

got it wrong but this is the answer edg 2021

In the preparation of a microscopic slide, the items which are used are medicine dropper, scissors, and a slip cover. Thus, the correct option is D.

Microscope slides are made for the purpose of observations of different objects. After the observation, the slides are discarded. In most cases, the slides use a liquid mounting medium such as water or glycerin.

The procedure for the preparation of the slide is as follows:

1. Place a drop of liquid mounting medium in the center of the slide.

2. Position the sample on liquid with the use of tweezers.

3. At an angle, place one side of the cover slip against the microscopic slide making contact with outer edge of the liquid drop.

4. Lower the cover slip slowly, avoiding air bubbles.

5. Remove the excess water present in it with the help of paper towel.

Therefore, the correct option is D.

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Wind power and hydroelectric power are renewable resources whereas, steel, gemstones, apple tress coal and oil etc. are non- renewable sources. Hence, they cannot be regenerated when exhausted.

Renewable sources are resources that can used for longer period or eternal. They can be regenerated and reused even after consumption of the existing amount. Wind power, solar power, hydroelectric power etc. are renewable sources and they are nature genuine.

Non- renewable sources are those which cannot be regenerated once they are exhausted. For example,  petroleum, coal, oil, diesel etc. are non-renewable because, once they completed from the earth, they cannot be regenerated or  excavated.

Non-renewable sources are creating pollution by the production of toxic hydrocarbon gases as well. Gemstones are non renewable because, once they consumed, they cannot be generated.

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Answer:

isopropyl benzene (cumene)

Explanation:

The reaction of isopropyl chloride and AlCl3 and benzene belongs to the class of organic reactions known as the Friedel Kraft alkylation.

The mechanism of the reaction involves the formation of a tetrahedral complex [AlCl4]^-.

The electrophile now is the isopropyl group which attacks the benzene to yield the product.

Answer:

b. Malic Acid

Explanation:

Malic (organic) Acid is found in apple.

GL

Answer:

yes males can give birth

Magnesium metal reacts with oxygen in the air to form a brittle white substance. The chemical name of this substance is MgO ( magnesium oxide)

What is a chemical reaction?

        2Mg(s) +O₂ (g) → 2MgO(s) + energy

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Answer:

See the answer below

Explanation:

The flow rate of a liquid/gas in a pipe is a quantity that measures the amount of liquid/gas that flows through the pipe at a given time.

In order to determine the speed of flow, the cross-sectional area of the pipe must be known because:

speed of flow = flow rate/cross-sectional area

Hence, if the flow rate of water in a pipe is 2L/s without specifying the cross-sectional area of the pipe, it says nothing about how fast the water is moving through the pipe.

It says nothing about how fast the water is moving through the pipe.

In order to determine the speed of flow, the cross-sectional area of the pipe must be known.

\(speed\ of\ flow =\frac{flow\ rate}{cross-sectional area}\)

Hence, if the flow rate of water in a pipe is 2L/s without specifying the cross-sectional area of the pipe, it says nothing about how fast the water is moving through the pipe.

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At equilibrium, the composition of the reaction vessel with 0.51 moles of CO₂ and 0.51 moles of H₂ is given by the equilibrium constant K, which is 819.

The reaction given is:

H₂(g) + CO₂(g) ⇌ CO(g) + H₂O(g)

So, we know the formula for Kp and Kc in terms of partial pressure and concentration are as follows:

Kc = (CO(g) × H₂O (g)) / (CO₂(g) × H₂(g))

Kp = (PCO × PH₂O) / (PCO₂ × PH₂)

At equilibrium, the equilibrium constant expression can be written as:

Kc = [CO][H₂O] / [H₂][CO₂] = x²/ [(0.51-x)(0.51-x)]

Substituting the given value of Kc into the above equation and solving for x gives:

819 = x²/[(0.51-x)(0.51-x)]

x = 0.302

From the results, we can say that "There will be very little CO₂ and H₂" at equilibrium.

The equilibrium constant for the given reaction is 819.

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Answer:

thermal shock

Explanation:

the temperatures inside the glass jar should have continued to increase over time. Internal stresses due to uneven heating. This is also known as “thermal shock”.

In general, the thicker the glass, the more prone it will be to breaking due to the immediate differences in temperature across the thickness of glass.

Borosilicate glass is more tolerant of this, as it has a higher elasticity than standard silicon glass.

You may also note that laboratory test tubes and flasks are made with thinner walls, and of borosilicate glass, when designated for heating.

According to the hydrocarbon combustion equation Both reactions are exothermic because they release energy in the form of heat.

Also, according to the calculation of the energy released in kJ/g, the Energy released by propane is 50.34 kJ/g and the Energy released by propane is 49.52 kJ/g. Therefore, propane is slightly more efficient than butane in terms of energy released per gram.

Explanation of the calculation of the hydrocarbon combustion:

The equation for hydrocarbon combustion is:
Hydrocarbon + Oxygen → Carbon Dioxide + Water + Energy

For propane (C3H8):
C3H8 + 5O2 → 3CO2 + 4H2O + Energy

For butane (C4H10):
C4H10 + 6.5O2 → 4CO2 + 5H2O + Energy

Both of these reactions are exothermic because they release energy in the form of heat.

Explanation of the calculation of the energy released in kJ/g:

To calculate the energy released by each gas in kJ/mole, we can use the standard enthalpy of combustion (∆Hc) values for propane and butane:

∆Hc for propane = -2220 kJ/mole
∆Hc for butane = -2878 kJ/mole

So, the energy released by propane is 2220 kJ/mole and the energy released by butane is 2878 kJ/mole.

To calculate the energy released in kJ/g, we can divide the energy released in kJ/mole by the molar mass of each gas:

Energy released by propane in kJ/g = 2220 kJ/mole / 44.1 g/mole = 50.34 kJ/g
Energy released by butane in kJ/g = 2878 kJ/mole / 58.12 g/mole = 49.52 kJ/g

Therefore, propane is slightly more efficient than butane in terms of energy released per gram.

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As an electron moves from a high potential to a low potential, its electrical potential energy increases.

Electric potential energy:

Electric potential energy is the energy that is needed to move a charge against an electric field. We need more energy to move a charge further in the electric field, but also more energy to move it through a stronger electric field.

The direction of electric fields is from the region of high potential to low potential and electrons or any negatively charged particle will move against the field or lower potential to a higher potential.

Therefore when an electron moves from higher to lower potential electrical potential energy increases.

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The complete question is:

As an electron moves from a high potential to a low potential, its electrical potential energy :

a) increases

b) decreases

c) remains constant

Yes, it is acceptable to mark the baseline (the starting line 1 cm from the plate bottom) using a pen.

The baseline (the starting line 1 cm from the plate bottom) can be marked using a pen. The statement is true. However, this statement is true only if the ink does not elute up the plate. The first answer is accurate because the ink will not elute up the plate, as mentioned. In paper chromatography, a baseline is a straight line that is drawn close to the bottom edge of the chromatogram paper. The chromatogram is the result of a paper chromatography experiment. The baseline is often constructed using a pencil or pen.

The color of the ink does not affect the chromatography of the mixture of compounds being analyzed. Other responses are incorrect. The second answer is incorrect because this statement does not guarantee that other compounds on the plate will not be easily distinguishable. The third answer is incorrect because the ink will not elute up the plate, as previously mentioned. The fourth answer is incorrect because the ink will not react with the silica plate, as previously mentioned.

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Answer:

b. a meadow replacing a pond in it's flood plain

Explanation:

I'ts a secondary succession.

Answer:

It protects the earth surface from dangerous radiation