. Minerals are classified according to their
a. color.
b. origin
C. composition.
d. specific gravity.
​

Answer:

Mg = 3

P = 2

O = 8

Explanation:

Mg3(PO4)2

Multiplying through by the number outside the bracket, we obtained

Mg3P2O8. From this, we can easily find the number of atoms of each element present as illustrated below:

Mg = 3

P = 2

O = 8

Answer:

1600cm3

Explanation:

From the question given, we obtained the following:

Density = 2.70g/cm3

Mass = 4.32kg :we need to convert the mass to grams

Mass = 4.32kg = 4.32 x 1000 = 4320g

Volume =?

Recall : Density = Mass /volume

Volume = Mass /Density

Volume = 4320/2.70

Volume = 1600cm3

The volume occupied by a block of aluminum which weighs 4.32 kg is 1600cm³.

Volume = mass (g) ÷ density (g/cm³)

Mass in grams = 4.32 × 1000 = 4320g

Volume = 4320g ÷ 2.70g/cm³

Volume = 1600cm³

Therefore, the volume occupied by a block of aluminum which weighs 4.32 kg is 1600cm³.

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Answer: Xe, Kr, Ar, Ne

Explanation:

Hope i helped please mark brainliest!

Answer:

73.49 atm

Explanation:

The balance chemical equation is as follow,

   C₃H₈ + 5 O₂  →  3 CO₂ + 4 H₂O

Given Data:

Temperature  =  T = 373 K

Volume  =  V  =  2.5 L

Gas Constant  =  R  =  0.0821 atm.L.mol⁻¹.K⁻¹

To find:

Pressure: P = ?

Formula:

P V = n R T

P = n R T / V

Here we also need to find number of mole,

According to balanced equation,

 1 mole of C₃H₈ on combustion gives  =  3 moles of CO₂

So,

2 moles of C₃H₈ on combustion will give  =  X moles of CO₂

Solving for X,

X  =  2 moles of C₃H₈ × 3 moles of CO₂ ÷ 1 mole of C₃H₈

X =  6 moles of CO₂

Moles  =  n  =  6 mol  

Solution:

P = 6 mol × 0.0821 atm.L.mol⁻¹.K⁻¹ × 373 K ÷ 2.5 L

 P =  73.49 atm

Answer:

Mg has two valence electrons  

Explanation:

Na has only one valence electron, so it readily donates that electron to other atoms to achieve an octet.

Mg must lose two valence electrons to get an octet. It takes extra energy to remove the second electron. In addition, the two electrons are in a filled s subshell, which has added stability.

Answer:

k = 4,92x10⁻³

Explanation:

For the reaction:

AB₂C (g) ⇄ B₂(g) + AC(g)

The equilibrium constant, k is defined as:

[tex]k = \frac{[B_{2}][AC]}{[AB_2C]}[/tex] (1)

Molar concentration of the species are:

[AB₂C]: 0,0840mol / 5L = 0,0168M

[B₂]: 0,0350mol / 5L = 0,0070M

[AC]: 0,0590mol / 5L = 0,0118M

Replacing this values in (1):

[tex]k = \frac{[0,0070][0,0118]}{[0,0168]}[/tex]

k = 4,92x10⁻³

I hope it helps!

Answer:

Mole

Explanation:

Answer:

The SI unit for the amount of a substance is mole.

Explanation:

SI unit stands for International System of units. It is the standard system of unit of measurements.

SI unit defines the amount of substance to be proportional to the number of entities present. It's unit for the amount of substance is mole. Also, the unit symbol for mole is mol.

In a crystal, the particles are arranged in an orderly, repeating, three-dimensional pattern.

Option C

Explanation:

Solid crystal particles can be ions, molecules or atoms, based on the material kind. The three-dimensional solid crystal system is called the crystal lattice. The crystals are divided into general categories according to their shape.

The crystal is characterized by faces that intersect at specific angles characteristic of this material. Crystal is a material in which particles get arranged in an ordered, repeatable, three-dimensional way. Means, a solid contains an atomic patterns that is uniformly repeated in three dimensions.

Answer: 82.9kPa

Explanation:

Gas pressure can be measured in several units, they include psi (pound per square inch), kPa (kilo pascal).

Recall that:

1 Kilopascal (kPa) = 0.14503773779 psi

So, let Z kPa = 12.02 psi

To get the value of Z, cross multiply

12.02 psi x 1kPa = 0.14503773779 psi x Z kPa

12.02 = 0.14503773779Z

Divide both sides by 0.14503773779

12.02/0.14503773779 = 0.14503773779Z/0.14503773779

82.9 kPa = Z

Thus, the 12.02 psi is equivalent to 82.9 kPa

Final answer:

To convert 12.02 psi to kPa, multiply it by the conversion factor of 6.89476, giving 82.914 kPa.

Explanation:

The student is asking to convert gas pressure from psi to kPa, which involves using a conversion factor. The value in psi needs to be multiplied by the conversion factor to find the equivalent pressure in kPa. According to the given information, 1 psi is approximately equal to 6.89476 kPa.

To perform the conversion from 12.02 psi to kPa:

Multiply 12.02 psi by the conversion factor of 6.89476 kPa/psi.

12.02 psi  imes 6.89476 kPa/psi = 82.914 kPa.

So, the pressure of 12.02 psi can be converted to 82.914 kPa.

Explanation:

The bigger the mass and the higher the height of the object above earth’s surface, the bigger the potential energy. The potential energy can be evaluated using the formula below;

P.E. = m*g*h, where

m = mass in kilograms,

g = the acceleration due to gravity (9.8 m / s² at the surface of the earth), and

h = height in meters.

From the formula, it is clear that increasing mass, gravity or/and height will give an increased potential energy

Answer: Heat change will be negative and reaction is exothermic.

Explanation:

In any system that involves heat flowing out of the system, (that is heat loss), the heat change will be negative and the reaction will be exothermic.

The activities describe the use of technology in science is as follows:

The use of technology in science involves various activities that enhance observation, data collection, analysis, and modeling. The activities that describe the use of technology in science include:

1. Looking at cells through a microscope: Microscopes are essential technological tools that enable scientists to observe and study microscopic structures, such as cells and microorganisms.

2. Viewing stars through a telescope: Telescopes are advanced optical instruments that allow astronomers to study distant celestial objects, stars, galaxies, and other astronomical phenomena in detail.

3. Developing a computer model for earthquakes: Creating computer models using specialized software and simulations is a crucial aspect of scientific research, particularly in fields like seismology, where scientists model earthquake behavior to understand and predict seismic activity.

Activities that do not directly involve technology include:

1. Observing a plant with the unaided eye: This activity relies solely on natural vision without the use of technological instruments.

2. Creating a blank data table by hand in a notebook: While this activity may involve manual recording, it doesn't necessarily involve the use of advanced technology. However, the data recorded in these tables can later be processed using technology.

In summary, the use of technology in science is evident in activities that rely on advanced tools and instruments, data analysis software, and computer modeling to enhance scientific research and understanding.

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p=mv

where p = momentum

m = mass

v = velocity

Answer:

1. 0.073L

2. 0.028L

3. 0.014L

Explanation:

The volume for the different solutions are obtained as shown below:

1. Mole = 0.53mol

Molarity = 7.25M

Volume =?

Molarity = mole /Volume

Volume = mole /Molarity

Volume = 0.53/7.25

Volume = 0.073L

2. 0.035mol from a 1.25M

Mole = 0. 035mol

Molarity = 1.25M

Volume =?

Molarity = mole /Volume

Volume = mole /Molarity

Volume = 0.035/1.25

Volume = 0.028L

3. Mole = 0.0013mol

Molarity = 0.090M

Volume =?

Molarity = mole /Volume

Volume = mole /Molarity

Volume = 0.0013/0.090

Volume = 0.014L

Answer:

D) water vapor

Explanation:

Answer: In the hot cup, they would be moving super fast, while in the cold cup they would just be fast.

Explanation:

Solids are stagnant, while liquids molecules are fast.

Answer:

The mole of glucose is 0.106mol

Explanation:

Glucose - C6H12O6

We will calculate the molar mass of glucose

C - 12

H - 1

O - 16

6 moles of carbon, 12 moles of hydrogen and 6 moles of oxygen

Mm = 6 * 12 + 12 * 1 + 16 * 6

= 72 + 12 + 96

= 180g/mol

Using the formula

n = m/Mm

n - number of mole

m - number of mass

Mm - number of molar mass

n = 19.1g/180g/mol

= 0.106g/mol

Answer:

Boron is a Metalloid Element

Explanation:

Final answer:

Boron is classified as a metalloid due to its electron configuration and covalent bonding nature, differing from other group 13 elements by not forming a stable B³+ ion and showcasing a range of compounds with multicenter bonding and fractional oxidation states.

Explanation:

Classification of Boron:

Boron is a unique element classified as a metalloid. It shares properties with both metals and nonmetals, which is evident in its covalent bonding patterns and its ability to form compounds such as boranes and organoboranes. Unlike its group 13 counterparts, boron does not form a stable B³+ ion due to high ionization energies. Instead, its chemistry is dominated by covalent bonding. Boron's 2s²2p¹ outer electron configuration results in an electron deficiency, allowing it to form unusual oxidation states, including fractional ones in boron hydrides. Boron is more electropositive than carbon and hydrogen, contributing to its ability to form covalent bonds with a variety of elements, resulting in a vast range of boron compounds.

Though often compared to silicon and carbon due to its covalency and potential for cluster formation, boron distinctively diverges in properties, such as preferring multicenter bonding. Its peculiar chemistry is also highlighted by its capability to adhere to the sextet rule rather than the octet rule, an example being its stable formation with hydrogen (BH).

Answer:

0.04167mole

Explanation:

To convert gram to mole,

C6H12O6

C - 12

H - 1

O - 6

There are 6 moles of C, 12 mole of H and 6 mole of O

Therefore, multiply each number of mole by the mass of each element

C - 12 * 6 = 72

H - 1 * 12 = 12

O - 16 * 6 = 96

The molar mass of C6H12O6 = 72 + 12 + 96

= 180g/mol

Dividing the number of mass by the mm

= 7.50g / 180g/mol

= 0.04167 mole

Answer:

Materials can be classified as solids, liquids, or gases based on whether their shapes and volumes are definite or variable. LIQUIDS: Have a definite volume but change shape · Particles are close together, but not held as tightly as a solid.

Explanation:

Answer:

b) Which is greater, moles of H+ or moles of OH-?

Explanation:

suppose 50.0 mL of 0.250 M CoCl2 solution is added to 25.0 mL of 0.350 M NiCl2 solution . ... [2*(50*0.250)+2*(25*0.350)]/75=0.567 M. 0 3 0.

Answer:

b) Which is greater, moles of H+ or moles of OH-?

Explanation:

Have a great day

A gas made up of atoms escapes through a pinhole 0.225times as fast as gas. Write the chemical formula of the gas.

Answer:

Explanation:

To solve this problem, we must apply Graham's law of diffusion. This law states that "the rate of diffusion or effusion of a gas is inversely proportional to the square root of its molecular mass at constant temperature and pressure".

Mathematically;

                 [tex]\frac{r_{1} }{r_{2} } = \frac{\sqrt{m_{2} } }{\sqrt{m_{1} } }[/tex]

r₁ is the rate of diffusion of gas 1

r₂ is the rate of diffusion of gas 2

m₁ is the molar mass of gas 1

m₂ is the molar mass of gas 2

let gas 2 be the given H₂;

   molar mass of H₂ = 2 x 1 = 2gmol⁻¹

rate of diffusion is 0.225;

  i .e r1/r2 = 0.225

          0.225 = √2  /  √ m₁

           0.225 = 1.414 / √ m₁

       √ m₁  = 6.3

           m₁  = 6.3²  = 39.5g/mol

The gas is likely Argon since argon has similar molecular mass

Answer:

C Hydrogen bonding is the main force that attracts water molecules to

one another.

Explanation:

Hydrogen bonding affects water molecules because, it is the main force which holds and attracts water molecules to one another.

Answer:

true

Explanation:

Answer:

How the relative density of a substance is related to the density calculate the density of iron if its relative density is 2 and a density of water is 2gcm -3

R.d= relative density of substance/ relative density of water

R.d= 2/2

R.d= 1gcm-3

Explanation:

Density of water=1000 kg/m^3. Relative density= density of substance/density of water. Relative density=7800/1000=7.8 · The radius of a solid sphere is 2 cm.

The relative density can be calculated directly by measuring the density of the sample and dividing by the (known) density of the reference substance. The density of a sample divided by its volume is the relative density of the sample, also known as specific gravity. The relative density of a substance is a pure number that has no units. It tells how many times a substance weighs more than water. The relative density (R.D) of a substance is calculated by dividing the density of a substance by the density of water. The relative density of a substance is the ratio of the density of the substance to that of water. And since it is the ratio of density to density. Hence, it is singular

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The most common method astronomers use to determine the composition of stars, planets, and other objects is spectroscopy. This process utilizes instruments with a grating that spreads out the light from an object by wavelength. This spread-out light is called a spectrum. Every element has a unique fingerprint that allows researchers to determine what it is made of.

The fingerprint often appears as the absorption of light. Every atom has electrons, and these electrons like to stay in their lowest-energy levels. But when photons carrying energy hit an electron, they can push it to higher energy levels. This is absorption, and each element’s electrons absorb light at specific wavelengths related to the difference between energy levels in that atom. But the electrons want to return to their original levels, so they don’t hold onto the energy for long. When they emit the energy, they release photons with exactly the same wavelengths of light that were absorbed in the first place. An electron can release this light in any direction, so most of the light is emitted in directions away from our line of sight. Therefore, a dark line appears in the spectrum at that particular wavelength.  

Because the wavelengths at which absorption lines occur are unique for each element, astronomers can measure the position of the lines to determine which elements are present in a target. The amount of light that is absorbed can also provide information about how much of each element is present.

A 1.0-gram sample of powdered Zn reacts faster with HCl than a single 1.0-gram piece of Zn because the surface atoms in powdered Zn have more contact with the H⁺ ions in the acid.

Hence, Option (C) is correct answer.

Zinc is a chemical element. The atomic number of Zinc is 30. Zinc belongs to period 4 and group 12 in the periodic table. Zinc is a transition metal.

HCl is Hydrochloric acid. It is a nonflammable gas. Hydrochloric acid is also called muriatic acid. It is a strong corrosive acid. HCl is also known as hydrogen chloride.

Thus from the above conclusion we can say that A 1.0-gram sample of powdered Zn reacts faster with HCl than a single 1.0-gram piece of Zn because the surface atoms in powdered Zn have more contact with the H⁺ ions in the acid.

Hence, Option (C) is correct answer.

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Final answer:

Powdered Zn reacts faster with HCl compared to a single piece because it has more contact with the H+ ions, allowing for more collisions and faster reaction rates due to increased surface area.

Explanation:

A 1.0-gram sample of powdered Zn reacts faster with HCl than a single 1.0-gram piece of Zn because the surface atoms in powdered Zn have more contact with the H+ ions in the acid. This increased contact area allows for more collisions and interactions between the Zn atoms and HCl, which results in a faster reaction rate. In a powdered form, zinc has a greater surface area exposed to the acid, leading to an increase in reaction rate compared to a single piece of zinc, which has a limited surface area exposed.

When zinc reacts with hydrochloric acid, a single displacement reaction occurs, producing hydrogen gas and an aqueous solution of zinc chloride. The balanced equation for the reaction is Zn(s) + 2 HCl(aq) → H2(g) + ZnCl2(aq). In this reaction, zinc transfers electrons to hydrogen atoms (protons), resulting in the formation of hydrogen gas. Increased surface area from the powdered form increases the number of these electron transfer events, thus increasing the reaction's rate.

Answer:

9m

Explanation:

Given parameters:

speed of caterpillar = 0.05m/s

time taken to move = 3min

Unknown:

distance covered by the caterpillar = ?

Solution:

Speed is defined as the rate of change of distance with time. It is a scalar quantity that does not measure direction but has magnitude;

        Speed = [tex]\frac{distance}{time}[/tex]

  Distance = speed x time

We need to convert the given time to seconds;

                  1 min = 60s

                 3 min = 60 x 3 = 180s

Input the variables;

                  distance = 0.05m/s x 180s = 9m

Answer:

(d) Heat flows from warmer to colder objects.

**wrong

answer is C

Answer:

heat flows from warmer to colder objects