4
A chemist encounters an unknown metal. They drop the metal into a
graduated cylinder containing water, and find the volume change is
6.1 mL. If the metal weighs 8.1 g, what is the density of the metal in
g/mL?

The heat absorbed is 6.69 kJ.

We know that heat is a form of energy that exists due to a temperature change. Now heat could be added to or removed from a body. The specific heat capacity is a measure of the heat that is required to raise the temperature of 1 g of a substance by one degree Celsius. The higher the specific heat capacity, the more the heat that could be taken in by a body without a corresponding temperature change.

Now we have the following words of information from the question;

Mass of ice = 206g

Initial temperature = 0 degrees Celsius

Final temperature = 16 degrees Celsius

From the literature, we know that the specific heat capacity of ice is obtained as 2.03 J/g∘C

Thus we could write;

H = m c θ

H = heat absorbed/emitted

C = specific heat capacity

Θ = temperature change

H = 206g * 2.03 J/g∘C * ( 16 – 0)

H = 6.69 kJ

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Missing parts;

An ice bag containing 206 g of ice at 0 °C was used to treat sore

muscles. When the bag was removed, the ice had melted and the

liquid water had a temperature of 16.0 °C. How many kilojoules of heat were absorbed?

The statement stating that a trend line shows shows the general pattern of data but does not connect all points  is true.

The characteristics of a trend line are as follows:

1) It must be explained mathematically-It should support the observations through the mathematical calculations.

2)It must be self-proving-It should be self-explanatory for it's origin.

3)It should be able to make the data look linear.

4)It should be a curved line when the data fluctuates.

5)It should be a visual representation of data.

6)It denotes the overall direction of the data.

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Answer:

Poorly Constructed Irrigation Wells

These wells can allow contaminants to enter ground water. Often pesticides and fertilizers are applied in the immediate vicinity of wells on agricultural land.

Some wells rely on artificial recharge to increase the amount of water

infiltrating an aquifer, often using water from storm runoff, irrigation, industrial processes, or treated sewage. In several cases, this practice has resulted in increased concentrations of nitrates, metals, microbes, or synthetic chemicals in the water.

Explanation:

The density of the given gold bar is 9.52 .

The density of gold metal used for jewellery is 19.32g/cm³

Given gold bar has mass of 10 grams and has volume of 1.05.

Density = mass /volume ⇒D =10/ 1.05= 9.52 g/cm³

so, the gold bar king has is not pure gold.

The acid test for gold is by rubbing  the gold-colored item on black stone, which will leave an easily visible mark. The mark is then tested by applying nitric acid, which dissolves the mark of item that is not gold. If the mark remains same, it is tested by applying aqua regia (nitric acid and hydrochloric acid).

In a nitric acid test, a jeweler places a few drops of the acid on the piece of item and watches for the reaction. With copper, the reaction causes the liquid to turn green, give off fumes, and  bubble. This response is called a hard cupric reaction and indicates that the item is not real gold

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Three quantum numbers were derived from Schrodinger wave equation.

Quantum numbers can be obtained while solving Schrodinger wave equation by the boundary conditions which can be applied while solving the equation in order to obtain solution which fits all the physical conditions.

Out of the four quantum numbers  the principal quantum number,azimuthal quantum number and magnetic quantum number can be obtained from solving  Schrodinger wave equation.

The only quantum number which cannot be  obtained from solving the  Schrodinger wave equation is spin quantum number,because it is related spin of the electrons which is explained by the Pauli's exclusion principle.

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The molar mass of bismuth subsalicylate is 391.12 g/mole.

Molar mass of a substance is defined as mass in of one mole of a compound. In a substance the amount of entity present is defined a mole.

Molar mass can be expressed as

M = m/n

Where M is molar mass, m is mass of substance and n is number of moles

To calculate molar mass of C7HsBiO4 is:

12.011 x 7 + 34.1 + 208.98 + 15.99 x 4

= 84.077 + 34.1 + 208.98 + 63.96

= 391.12 g/mole

Thus, the molar mass of bismuth subsalicylate is 391.12 g/mole.

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The speed of an electron expelled from a surface when light with a wavelength of 690.0 nm is delivered. A wavelength of 795 nm has sufficient energy to eject electrons is v = 2.886 × 10⁵ m/s.

The wavelength, which will also apply to troughs, is the separation between two wave crests. The frequency is measured in cycles per second (Hz), which is the quantity of vibrations that cross a specific area in a second (Hertz). In this article, the relationship between wavelength and frequency is covered.

hf = Φ + KE

Φ = Work function is energy required to remove an electron in (J)

h = Planck’s constant = 6.626 x 10⁻³⁴ J • s

f = threshold frequency or higher

KE = maximum kinetic energy of emitted electrons (J)

Electron mass is 9.109 x 10⁻³¹ kg kg and the speed of light is 2.998 x 10⁸ m/s

The energy of a photon of 795 nm light will give the work function Φ.

λ = 795 nm = 7.95 x 10⁻⁹ m

E = (hc/λ) = 2.499 x 10⁻¹⁹ J

Find the energy of a photon with wavelength λ = 336.0 nm = 3.360 x 10⁻⁷ m

m = 9.1 * 10⁻³¹ kg

1/2mv² = hc (1/690×10⁻⁹ - 1/795 × 10⁻⁹)

1/2mv² = 6.62 × 10⁻³⁴ × 2.998 ×10⁸ (10⁹/690 - 0.001258 × 10⁹⁹)

1/2mv² = 19.874 × 10⁻²⁶ (0.001449 × 10⁻⁹ - 0.001258 × 10⁻⁹)

1/2mv² = 19.847 × 10⁻²⁶ (1.44 * 10⁻⁶ - 1.258 × 10⁶)

1/2mv² = 19.847 × 10⁻²⁰ (1.449 - 1.258)

1/2mv² = 19.847 × 10⁻²⁰ × 0.191

1/2mv² = 3.791 × 10⁻²⁰

v² = 3.791 × 10⁻²⁰/m

v² = 7.582 × 10⁻²⁰/9.1 × 10⁻³¹

v² = 0.8332 × 10¹¹

v² = √8.332 × 10¹⁰

v = 2.886 × 10⁵ m/s.

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Answer:

Calcium and Magnesium

Explanation:

Dissolved calcium (Ca++) and magnesium (Mg++) are the only two divalent cations found at appreciable levels in most waters.

Answer: A hydrogen bonded to an oxygen is more “attractive” than a carbon bonded to an oxygen. So, water molecules are “stickier” than ethanol molecules – making it easier for water molecules to get “stuck”.

Explanation:

sulfide mineral is made of from metal and sulfphur

Sulfide, also written sulphide, is a category of chemicals that contain sulfur and one or more metals. The majority of sulfides have basic structural characteristics, great crystallographic symmetry, and numerous metal-like characteristics, such as metallic lustre and electrical conductivity.

Sulfides include, for instance, chalcopyrite, galena (the primary ore mineral for lead and silver), and cinnabar (the primary ore mineral for mercury) (which provides copper).

Sulfide minerals are composed of sulfur and one or more metals; sulfarsenides have some of the sulfur replaced with arsenic.

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Gamma ray have the highest frequency.

Gamma ray has the shortest wave length. it has the highest energy and highest frequency. Gamma Radiation region has the highest frequency.

Electromagnetic spectrum is the range of frequencies of the EM radiations and their wavelengths.  

Frequency is the number of waves that pass a point at unit time. It can be also defines as the number of cycles or vibrations .Its Formula is,

                                        f=1/T

          were f= frequency,

                   T= time period.

Time period is the duration of time in which an activity occurs.

In Gamma ray their wavelengths are shorter that the nucleus of the atom, because of this they have high frequencies. Their frequencies are greater than 1019Hz.

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All life on Earth depends on the atom carbon. All plant and animal life involves the ingestion and expulsion of carbon, whether it be for the purpose of producing food or as part of respiration. Carbon is always moving from one location to another.

Explain how carbon can move through the organisms in that ecosystem.

Carbon moves from photosynthetic plants to other consumers in the kelp forest. Carbon is transferred from bacteria to other consumers when at hydrothermal vents.

Ecosystem of the kelp forest:

Water-heating vent Ecosystem:

These bacteria coexist symbiotically with the primary consumer.

On the principal consumer, the other consumers feed.

As a result, we can infer that carbon is transferred from photosynthetic plants to other consumers in kelp forests. Carbon is transferred from bacteria to other consumers when at hydrothermal vents.

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When determining the significance of digits in a number, the general rule is as follows:

1. Non-zero digits are always considered significant.

2. Leading zeros (zeros to the left of the first non-zero digit) are not considered significant.

3. Captive zeros (zeros between non-zero digits) are considered significant.

4. Trailing zeros (zeros to the right of the last non-zero digit) may or may not be significant, depending on whether they serve as placeholders.

In the number 0.04600, we can label each digit as follows:

0.04600

The first zero is a leading zero and is not considered significant.

The digit 0 after the decimal point is considered significant as it is a captive zero.

The digits 4 and 6 are non-zero digits and are considered significant.

The last two zeros are trailing zeros, and their significance depends on whether they serve as placeholders.

If the zeros in 0.04600 are intended to indicate the precision of the measurement or represent significant figures, then the trailing zeros are significant. In this case, all the digits in the number (0.04600) are significant.

However, if the zeros in 0.04600 are not intended to convey the precision or significant figures, and they are just placeholders, then only the first three digits (0.046) are significant, and the trailing zeros are not significant.

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There are 65 moles of atoms in 65 molecules of CaCl2 ( Calcium chloride )

In stoichiometry,

1 moles of any substance = 6.022 × 1023 molecules or atoms.

x moles of CaCl2 = 65 * 6.022 × 1023

Cross multiplying this equations

x * 6.022 × 1023 = 1 * 65 * 6.022 × 1023

6.022 × 1023x = 65 * 6.022 × 1023

x = 65 * 6.022 × 1023 / 6.022 × 1023x

x = 65 moles.

This means that there are 65 moles in 65 molecules of CaCl2

Mole simply refers to the quantity of atoms, molecules or particles that an atom of an element contains.

1 moles of any substance equals 6.022 × 1023 molecules or atoms.

So therefore, there are 65 moles in 65 molecules of CaCl2 ( Calcium chloride )

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Answer

0.6 km/min2

Explanation:

Answer:

?????????

Explanation:

Answer:

Lower density than water

The answer to the question “Why does oil float on water?” is that oil floats on water because of its lower density than water. Oil and water molecules do not mix with each other due to the polarity of water molecules and the non-polarity of oil molecules. The volumetric mass of a liquid, expressed in cubic meters, is its density.

mass of quail eggs he need to weigh out to have the same number of eggs in both is 2 Kg

mass of standard chicken egg is 37.44g

mass of standard quail egg is 2.34g

Ratio of mass of eggs 16:1

Given,

farmer weighs out 32 Kg of chicken eggs

let x be the mass of the quail eggs he needed

let's calculate mass of quails eggs he needed

1/16 = x/32

x = 2kg

Therefore, mass of quail eggs he needed to weigh out same number of eggs in both is 2kg

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A 10g metallic block measures has a volume of 5 cm^3. The density of the metallic block in g/cm^3 is 2gm/cm^3. The density of a metallic block is calculated by p=m/v

Its density is the amount of "stuff" that can be packed into a given amount of space. A block of the tougher, lighter element gold (Au), for example, will have a higher density than a block of the heavier element lead (Pb).

The density of a substance is given by the following formula:~

                                   ρ = m/v

where the respective alphabets stands for

ρ is the density

m is the mass

V is the volume

by replacing in formula :

                                    p = 10(gm)/5cm^3

                                    p = 2gm/cm^3

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Answer:

d) solar panels and solar cells

Upbeat, Fast, Staccato type of music would most likely accompany a photo of a fox chasing a rabbit.

Its language transcends barriers and divisions.

Everyone uses the same language when it comes to music. It is a factor that unites people from all over the world regardless of where they are from and is unaffected by boundaries or prejudices. This would appear that one of our most fundamental instincts is to make music.

Science has demonstrated that music has a significant impact on the brain. According to recent studies, music can benefit the brain in a variety of ways, including by reducing pain, reducing stress, improving memory, and healing brain injuries.

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Option B , Upbeat, Fast, Staccato type of music would most likely accompany a photo of a fox chasing a rabbit.

Science has demonstrated that music has a significant impact on the brain. According to recent studies, music can benefit the brain in a variety of ways, including by reducing pain, reducing stress, improving memory, and healing brain injuries. So, music is so important and powerful.

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If 105.5mg sample of a white substance, suspected of being

cocaine (C17H21NO4), forms 2.79.3mg of CO2 and 66.46mg of

water on combustion, then the white solid is cocaine.

A Combustion reaction is defined as the chemical reaction which is generally a fuel that undergoes an oxidation by the reaction by the help of an oxidizing agent, which further results in the emission of energy.

Thus, we concluded that the white solid is cocaine if If 105.5mg sample of a white substance, suspected of being

cocaine (C17H21NO4), forms 2.79.3mg of CO2 and 66.46mg of water on combustion.

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The amount of the technetium-99m that will remain in the patient’s body 96 hours after injection is 0.000803 mCi

We'll begin by obtaining the number of half-lives that has elapsed. This can be obtained as follow:

n = t / t½

n = 96 / 6

n = 16 half-lives

The amount of the radioactivity remaining in the patient's body can be obtained as follow:

N = N₀ / 2ⁿ

N = 52.6 / 2¹⁶

N = 0.000803 mCi

Thus, the amount remaining is 0.000803 mCi

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Answer:

Explanation:

1. D

2. B

3. C

4. A

A model rocket has mass 0f 0.2 kg with motor that provide force of 100N. a second rocket model is being built with the same ,but designed to accelerate half as much first .the mass of second rocket should be 0.4 kg.

Mass of first rocket m1 = 0.2 kg

force of first rocket F1 = 100 N

force of first rocket F1= force of second rocket F2

mass of second rocket m2 = ?

acceleration of first rocket = a1

acceleration of second rocket = a2

Force = mass × acceleration

a1 = F1 / m1   and  a2 = F2 / m2

F1 / m1 = F2 / m2

F1 = F2

it is given that acceleration of second rocket is half as much as the first rocket,

therefore,

F1 / 2m1 = F1 / m2

m2 = 2m1

m2 = 2 × 0.2kg

      =   0.4kg

Hence,A model rocket has mass 0f 0.2 kg with motor that provide force of 100N. a second rocket model is being built with the same ,but designed to accelerate half as much first .the mass of second rocket should be 0.4 kg.

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Constitutional isomers, they only differ in the position of the substituents.

The term isomers refers to the compounds that have the same molecular formula but different structural formulas. This implies that the atom to atom connection and the and the position of the substituents tend to differ quite markedly.

Now when we talk about the constitutional isomers, they only differ in the position of the substituents. The two compounds are essentially the same in the carbon structure but the placement of the substituents do differ. The two cyclic constitutional isomers of trans-1,2-  dimethyl cyclopentane with the same size ring are shown in the image attached.

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Answer:

I thinnk neutron bcoz its is a charge less particle and it's contains less atom so it has less mass

Answer:

2.6187E24 same as 2.6187 × 10^24

Explanation:

we must use 1 conversion fact 6.02E23

1. Convert to Atoms of P from Moles of P

4.35 × 6.02E23 = 2.6187E24

Please let me know if i need to further eloborate :)