A scientist wants to find out what type of mineral she has. What is the best way for her to find out?

She could look at the weight, hardness, and color.

She could look at the color, hardness, and luster.

She could look at the color, weight, and size.

She could look at the shape, size, and hardness.

when pressure of the reactant mixture at the equilibrium and with the fewer moles in reactant side will be increased and the equilibrium will be shift to the side in the reaction where the fewer moles of the gas.

According to the Le Chartelier, when the reaction is in the equilibrium phase and the one of the constraints which will affect the rate of the reactions, and the equilibrium will be shift to the cancel out  this effect that the constraint had.

Therefore, If the pressure of the system or the reaction is in the equilibrium is change, the equilibrium of the reaction will be change that is depending on the side of the reaction with the highest number of the molecules.

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Answer:

he enthalpy of vaporization is 27.3 kJ/mol. The correct answer is therefore (C) 27.3 kJ/mol.

Explanation:

To find the enthalpy of vaporization, we can use the Clausius-Clapeyron equation, which relates the vapor pressure of a liquid to its enthalpy of vaporization. The equation is given by:

ln(P2/P1) = (delta Hvap / R) * (1/T1 - 1/T2)

where P1 and P2 are the vapor pressures at temperatures T1 and T2, respectively, delta Hvap is the enthalpy of vaporization, and R is the gas constant. In this case, we are given that the vapor pressure doubles when the temperature is raised from 298 K to 318 K, so P2 = 2 * P1. We can plug this into the equation and solve for delta Hvap to find the enthalpy of vaporization:

ln(2) = (delta Hvap / R) * (1/298 - 1/318)

delta Hvap = R * ln(2) / (1/298 - 1/318)

Plugging in the values, we get delta Hvap = 8.31 J/(K-mol) * ln(2) / (1/298 - 1/318) = 27.3 kJ/mol. The correct answer is therefore (C) 27.3 kJ/mol.

The metal can be identified using its specific heat capacity. Here, the specific heat capacity of the substance calculated from calorimetric equation is 0.39 J/g °C , that is the specific heat of copper metal. Hence, option D is correct.

The specific heat capacity of a substance is the heat energy required to raise the temperature of the substance by one degree Celsius per on gram. It is characteristic to the substance.

The calorimetric equation connecting the heat energy q, with mass of the substance m, specific heat c and temperature difference ΔT is given below:

q = m c ΔT.

Given,  m = 100 g

q = 0.5 KJ = 500 J

ΔT = 37.8 - 25 °C = 12.8 °C

then c = q/mΔT

c = 500 J/12.8 °C × 100 g = 0.39 J/g °C

this specific heat corresponds to the copper metal.

Therefore, the block is made of copper metal.

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Answer:

is there an image

Explanation:

Sorry, your photo isn't clear enough.

To prepare a 0.12 M solution of FeCl₃, the amount of solid FeCl₃ to be dissolved in a given volume of solvent will be 9.72 grams.

Given,

Molarity of FeCl₃ (M)= 0.12 M

The molecular weight (m) of FeCl₃ is  = 162 gm

The volume of the solution (V) to be prepared is =500 ml

The amount of FeCl₃ to be dissolved to make a 0.12 M solution is= x

So,

MV= x ÷ m × 1000

0.12× 500 = x ÷ 162 × 1000

x = 60 × 162 ÷ 1000

x= 9.72 gm

So 9.72 grams of FeCl₃ is dissolved to make 500 ml of 0.12 M solution.

For preparing 0.4 M HCl from 4M HCL:

If we need to make 500 ml of solution with 0.4M of HCL, then we use the formula:

M₁V₁= M₂V₂

0.4 × 500= 4 × x

x= 50 ml

So 50 ml of 4M HCL is taken to make 0.4 M HCL.

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The waves that  has the greatest wavelength is Wavelength shown with 1 wavelength stretched over a long distance.

A wave could be a disturbance or variety that voyages through a medium or space, carrying vitality without transporting matter. Waves can take different shapes and happen totally different sorts of waves, counting mechanical waves and electromagnetic waves.

Mechanical waves require a medium to propagate, meaning they require a substance like water, discuss, or a strong fabric to transmit the wave. Illustrations of mechanical waves incorporate water waves, sound waves, and seismic waves. In these waves, particles of the medium sway or vibrate in a design, exchanging energy from one molecule to another.

Electromagnetic waves, on the other hand, don't require a medium and can travel through vacuum, such as in space. Electromagnetic waves comprise of electric and attractive areas swaying opposite to each other and to the heading of wave engendering. Illustrations of electromagnetic waves incorporate obvious light, radio waves, microwaves, infrared waves, bright waves, X-rays, and gamma beams.

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Answer:

c. 1.58 KJ

Explanation:

I took the test:)

Answer:

1.58 KJ

Explanation:

The amount of water needed to be added to a 8.6317 M NaCl solution to obtain a 1.0421 M solution starting with 4.7869 liters of solution would be 34.8629 L.

The problem here has to do with dilution. The dilution principle states that the number of moles of solute in a solution is constant before and after dilution.

In other words, the dilution principle can be mathematically expressed as:

\(m_1v_1\) = \(m_2v_2\).

Where \(m_1\) and \(m_2\) are molarities before and after dilution; \(v_1\) and \(v_2\) are volumes before and after dilution.

In this case:  \(m_1\) = 8.6317 M,  \(m_2\)= 1.0421 M,  \(v_1\)= 4.7869 L. We are to determine v2.

\(v_2\) = \(m_1v_1\)/ \(m_2\)

    = 8.6317x4.7869/1.0421

    = 39.6498 L

If the final volume of the solution is 39.6498 L and the starting volume is 4.7869, then the amount of water needed can be calculated as:

39.6498 - 4.7869 = 34.8629 L

Thus, the amount of water that will be added to the original solution in order to arrive at the diluted solution is 34.8629 L.

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Answer:

protists that produce a hard outer covering have left many fossils, other protists lack hard parts, so few fossils of these organisms have been found. ... Protists in this group are called plantlike because, like plants, they contain the pigment chlorophyll in chloroplasts and can make their own food.

Explanation:

Hope it helps, some how.

Answer:

Reflection

Explanation:

Very smooth surfaces such as mirrors reflect almost all incident light.

\(\underline\mathtt\colorbox{gold}{Reflection}\)

Explanation:

Bouncing back of light from a surface is called reflection.

Complete Question

The complete question is shown on the first uploaded image

Answer:

The correct option is  ammonia

Explanation:

The mixture contains two base compound which are

           ammonia,

and     diethylamine

Now the addition of HCl which is  a strong acid in step 1  will cause the protonation of  the  two base compound , which makes the soluble hence resulting in them being extracted to the aqueous layer as represented in below

       \(NH_3 + HCl\to NH_4 ^{+} + Cl^-\)

and

     \((CH 3CH 2) 2NH + HCl \to (CH 3CH 2) 2NH_2^{+} + Cl\)

5.50M NaOH must be added to 680.0 mL of a buffer, The amount of NaOH  is mathematically given as

V=2.107mL

Generally, the equation for Chemical Reaction is mathematically given as

CH3COOH+OH^{-} ⇄ CHCOO^{-} + H2O

Therefore

pka=-log(1.8*10{-5})

pKa=5-0.25527

pKa=4.3447

Hence

\(pH=pKa+log\frac{CH3COO}{CH3COOH}\\\\0.75=4.7447+log\frac{0.01564+x}{0.01428-x}\)

x=0.0115898

Volume of NaOH

V=0.0021072L

V=2.107mL

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When comparing various liquids, a liquid can be recognized by its behavior on paper, which is a defining attribute of the liquid.

On two distinct paper surfaces, we will test four known liquids and an unknown liquid. we will identify an unidentified liquid using their observations. We will learn that we can effectively identify an unidentified liquid by combining the findings of two experiments. On a coffee filter dipped in green food coloring, we will also add water and salt water. we can tell a big difference in how each liquid separates the hues of the green food coloring. When comparing various liquids, a liquid can be recognized by its behavior on paper, which is a defining attribute of the liquid. The equal quantity of each liquid should be applied to the paper in the same location for the test to be fair.

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Answer:

Alcohol?

Explanation:

(for Plato)

The nuclear equation is written as:

²³¹₉₁Pa ⇒ ²²⁷₈₉A₀ + ⁴₂He

Alpha decay is defined as a nuclear decay process where an unstable nucleus is transformed to another element by shooting out a particle composed of two protons and two neutrons.

This particle that is ejected is  known as an alpha particle.

The steps of the alpha decay is written as;

Write the mass number and the atomic number of the parent atom.

Find the mass number and the atomic number of the daughter atom.

Mass number , A - 4

Atomic number, Z - 2

Then, we have;

²³¹₉₁Pa ⇒ ²²⁷₈₉A₀ + ⁴₂He

Mass number = 231 - 4 = 227

Atomic number = 91 - 2 = 89

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800 mL of deionized water is added to 1.782 g of Cocl2.6H2O and then more deionized water is added until the total volume reaches 1000 mL.

To prepare a 7.5mm solution of Cocl2.6H2O, you will need to follow these steps:

Calculate the molecular weight of Cocl2.6H2O, which is 237.93 g/mol.

Weigh out 1.782 g of Cocl2.6H2O on a scale and add it to a 1000 mL volumetric flask.

Add approximately 800 mL of deionized water to the flask and swirl to dissolve the compound.

Once the Cocl2.6H2O is dissolved, add more deionized water until the total volume reaches 1000 mL.

Mix the solution thoroughly to ensure homogeneity.

To use this solution as a hypoxic agent for fish, you will need to determine the appropriate dosage for your specific application.

The concentration of Cocl2.6H2O used will depend on the size and species of fish, as well as other factors such as water temperature and oxygen demand. It is important to carefully monitor the fish during treatment to ensure that they are not experiencing any adverse effects.

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Answer:

1.37x10²⁵atoms of carbon

2.74x10²⁵ atoms of oxygen.

33.7g of KNO₃

Explanation:

To answer this question you must use molar mass of carbon dioxide (44g/mol) and 1 mole are 6.022x10²³atoms.

1.00kg are 1000g of CO₂. Moles are:

1000g CO₂ * (1mol / 44g) = 22.73 moles of CO₂ = 22.73 moles of carbon.

In atoms:

22.73 moles C * (6.022x10²³atoms / 1mole) = 1.37x10²⁵atoms of carbon

There are 22.73 moles of CO₂ * 2 = 45.45 moles of oxygen are present in the carbon dioxide. In atoms:

45.45 moles Oxygen * (6.022x10²³atoms / 1mole) = 2.74x10²⁵ atoms of oxygen.

1 mole of Potassium nitrate, KNO₃, contains 3 moles of oxygen. 1 mol of oxygen are:

1.00 mol O * (1mol KNO₃ / 3 moles O) = 0.33 moles of KNO₃

As molar mass of KNO₃ is 101.1g/mol:

0.33 moles of KNO₃ * (101.1g / mol) = 33.7g of KNO₃

Answer:

1. 1.37 * 10^25 atoms of carbon

2. 2.74 * 10^25 atoms of oxygen

3. 33.67g of Potassium Nitrate

Explanation:

2. Firstly, we want to know the number of atoms of oxygen in 1 kg of carbon dioxide.

Firstly, we will need to know the number of moles of carbon iv oxide in 1kg of carbon iv oxide

Mathematically;

number of moles = mass/molar mass

molar mass of carbon iv oxide is 44 g/mol

mass here is 1000g (1kg is 1000g)

So the number of moles of CO2 in 1kg of CO2 will be; 1000/44 = 22.73 moles

Now 1 mole of CO2 contains 2 atoms of oxygen, thus 1 mole of CO2 contains 2 moles of oxygen

So the number of moles of oxygen in 1kg CO2 will be 2 * 22.73 = 45.46 moles

Mathematically, 1 mole contains 6.02 * 10^23 atoms

So 45.46 moles will contain =

6.02 * 10^23 * 45.46 = 2.74 * 10^25 atoms of oxygen

1. 1 mole of co2 contains 1 atom of carbon , thus, 1 mole of CO2 will

contain 1 mole of carbon

From above, 1kg of carbon iv oxide contains 22.73 moles , thus 1kg of carbon iv oxide will contain 22.73 moles of carbon too

So the number of atoms will be 22.73 * 6.02 * 10^23 = 1.37 * 10^25 atoms

3. Mass of KNO3 that contains 1 mole of oxygen atom

From the formula of the compound, we can see that 1 mole of KNO3 contains 3 atoms of oxygen which translates to 3 moles of oxygen

So 1 mole of oxygen will translate to 1/3 mole of KNO3

Mathematically;

mass = number of moles * molar mass

Molar mass of KNO3 = 39 + 14 + 3(16) = 39 + 14 + 48 = 101 g/mol

So the mass will be = 1/3 * 101 = 33.67g

the field of science which would mostly research is chemistry.

The factory had a negative effect on all the populations in the ecosystem. This is the effect of a new factory on a wetland ecosystem.  Therefore, the correct option is option A.

A wetland is a composite ecosystem that also contains ecosystems related to hydrology, soil, vegetation, or biology. The rate of urbanisation in China's national economic growth process is now rising quickly, so by the end of 2021, the country's resident population will have an urbanisation rate of 64.72%. The factory had a negative effect on all the populations in the ecosystem. This is the effect of a new factory on a wetland ecosystem.

Therefore, the correct option is option A.

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At pOH value  of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

In this question we will apply the formula

      pH +pOH = 14 . . . . . . . . . . . . .(1)

where pH = concentration of [\(H^{+}\) ] ion

pOH = concentration of [\(OH^{-}\) ] ion

As per the question

pOH =6.0

Putting the value of pOH in equation (1) we get the value of pH

              pH + 6.0 =14

             pH = 14 -6.0

             pH  = 8.0

 The value of pH if the pOH value is 6.0 is 8.0

To find the concentration of \(H^{+}\) ion we will use the following formula

This is calculated by the formula

                                 [\(H^{+}\)} = \(10^{-pH}\)

where we will write the values of pH

Hence the concentration of [\(H^{+}\)} ion is \(10^{-8}\)

Therefore at  pOH of 6.0 the pH value of the following solution is 8.0 and the concentration of [\(H^{+}\) ] ion is \(10^{-8}\)

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The complete question is -

What is the pH value and concentration of [\(H^{+}\) ] ion of the following if the pOH value of the solution is 6.0 ?

We have the melting and boiling point of HCl.

The melting point is the temperature at which HCl will change from solid to liquid. Below this temperature, HCl will be solid and the molecules will be very organized and close.

Up to this temperature, HCl will be liquid. The molecules will be a little more disorderly than in the solid state.

The boiling point is the temperature at which HCl will change from liquid to a gaseous state. Below this temperature HCl will be liquid, up to this temperature HCl will be gaseous and the molecules will be very far from each other.

Now, with the given data we have that the states of HCl depending of the temperature will be:

Gaseous state: Temperature> -85.1 C

Liquid state: -114.8 C < Temperature < -85.1 C

Solid state: Temperature < -114.8 C

Now, we have three options given, the state for each option will be:

A. -96 C, HCl will be in Liquid

B. -37 C, HCl will be gaseous (Molecules higly disorganized and far from each other)

C. -124 C, HCl will be solid (Very organized)

Therefore the correct option will be:

Answer:

Explanation:

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

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

From the question we have

volume = final volume of water - initial volume of water

volume = 45 - 30 = 15 ml

We have

\(density = \frac{45}{15} = 3 \\ \)

We have the final answer as

Hope this helps you

Explanation:

from internet

the act of transferring pollen grains from the male anther of a flower to the female stigma

Answer:

transfer of pollen from anther to stigma.

Explanation:

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The 2.9 grams would this oxygen (0₂) weigh in its liquid form.

What is oxygen ?

The sole sort of atom in oxygen makes it a chemical element, which is a substance. An oxygen atom has eight protons in its nucleus, as indicated by its atomic number of 8, which is represented by the letter O in its official chemical formula. At room temperature, oxygen is a gas that lacks all other flavors, smells, and colours. Molecular oxygen can be found in nature.

What is liquid ?

Unlike a solid, which is more rigid than a liquid, a liquid is a kind of substance with unique qualities. The opposite of a solid, which has a defined shape, is a liquid, which can flow. An alternative is that a liquid will take on the shape of the container it is held in.

Therefore, 2.9 grams would this oxygen (0₂) weigh in its liquid form.

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Answer:

oxidation- reduction

Explanation:

where gaining electronic reduces one element and losing them oxidize the other nitric acid is not only strong it is also a oxidizing agent

When copper is changed to copper(II) nitrate by the nitric acid, it is an example of an oxidation-reduction.

Molecule is defined as number of atoms combined together, that shows the most smaller chemical compound's fundamental unit that participate in chemical reaction. In the combination of atoms attractive forces play a vital role and it helps to bound the atoms by a chemical bond.

Liquid consist of small range of order and the reason behind this is intermolecular attractive force which is very strong and due to this reason molecules are packed together tightly. Due to presence of high kinetic energy the molecules present in the liquid move rapidly and fastly  with one another.

Water is considered to be the simpler molecule and it consist of hydrogen and oxygen atom bounded together and due to the reason of high electronegativity of the oxygen's atom the bonds present are polar as well as covalent.  Due to presence of high kinetic energy the molecules present in the liquid move rapidly and fastly  with one another.

Therefore, When copper is changed to copper(II) nitrate by the nitric acid, it is an example of an oxidation-reduction.

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The bactericidal activity of sanitizers prepared from the water will be reduced if the hardness or pH of the water used to prepare EO water or bleach solutions are increased.

Temperature, pH, relative humidity, and water hardness are other physical and chemical variables that affect disinfection processes. For instance, most disinfectants become more active as the temperature rises, but there are some exceptions.

The harder your water is, the less effective cleaning products will be since it will be difficult to make a soapy lather. Scale, which are crusty deposits made by hard water, can build up in your dishwasher or washing machine. Detergent works effectively when used with soft water.

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She said that the exposure to the radiation in the microwave would have cooked the animal's internal organs. She said: 'It is a horrific case in the fact that the death of the cat would have been prolonged and it is unimaginable what it would have gone through taking some time to die.

Answer:

different from ionic or covalent bonding

Explanation: