What is the density of an object with a volume of 3ml and a mass of 18 grams

Homogeneous mixture are Brass, Vodka and Sugar; while Heterogeneous mixture are Gravel and Potato salad.

A homogeneous mixture is a type of mixture where the composition is uniform and the same throughout. Examples of homogeneous mixtures include saltwater, air, and vinegar. These mixtures have a consistent appearance and properties, and their individual components cannot be easily separated.

A heterogeneous mixture is a mixture where the composition is not uniform and can vary in different parts of the mixture. Examples of heterogeneous mixtures include salad, fruit punch, and soil. These mixtures have varying appearance and properties, and their individual components can be easily separated.

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Answer:

(Magnox, AGR, PWR, BWR, CANDU and RBMK) have emerged as the designs used to produce commercial electricity around the world. A further reactor type, the so-called fast reactor, has been developed to full-scale demonstration stage.

Explanation:

Answer:

A pressurized-water, graphite-moderated reactor shielded by concrete

A graphite-moderated reactor that uses enriched uranium fuel

A reactor that uses liquid sodium as a coolant

A reactor that uses moderately enriched uranium as the fuel and ordinary water as the moderator in place of graphite

Answer:

A layer of soft hot rock

Explanation:

Answer:

During the early Paleozoic Era, the Earth's surface was very different from what it is today. The continents were arranged differently, forming one large supercontinent called Pangea. This landmass was surrounded by a single large ocean called Panthalassa. The climate was much warmer and wetter than it is today, with no ice caps at the poles.

The first land plants, known as bryophytes, appeared during the early Silurian Period, around 430 million years ago. These plants were small and simple, lacking roots and vascular tissue. They grew in damp environments, such as along the edges of lakes and streams. They were important in the development of soils and in the colonization of land by other organisms, such as insects and other arthropods.

Answer:

A) oxygen moles/sec = 48 * 10 ^-14  mol/sec

B) mass of oxygen = 1536*10^-14 grams

Explanation:

cross sectional area of cylinder = 2cm^2 = 2 * 10^-4 m^2

length of cylinder = 5 cm = 0.05 m

concentration at one end = 0.2 mol m^-3

concentration falls linearly at other end = 0.05 mol m^-3

Diffusion constant of oxygen = 8 * 10^-10  m^2 s^-1

A ) Number of moles of oxygen passing every second

 N = A * D * \(\frac{dc}{dt}\)   ------- ( 1 )

A = area , D = diffusion constant,  \(\frac{dc}{dt}\) = rate of change of diffusion

dc /dt = ( 0.2 - 0.05 ) / 0.05  = 3 mol m^-4

back to the equation

N = ( 2 * 10^-4 ) * ( 8 * 10^-10 ) * ( 3 ) = 48 * 10 ^-14  mol/sec

B) Mass of oxygen passing down the cylinder each second

This can be obtained by converting : 48 * 10^-14 moles to grams

1 mole of oxygen  =  32 grams of oxygen

therefore : 48 * 10^-14 moles of oxygen = ( 32 * (48*10^-14) = 1536*10^-14 grams

From he calculations, we can see that the total pressure at equilibrium is 21 atm.

The term equilibrium constant commonly describes the constant that that shows the extent of conversion of reactants to products.

We have to find the pressure of each gas as follows;

For H2

P = nRT/V = 4.553 /2  × 0.082 × 1000/8.89 L = 21 atm

Using the ICE table;

         C(s)   +   2H2(g)  ⇌  CH4(g)

I                       21 atm          0

C                      -x                  +x

E                     21 - x              x

0.263= x/(21 - x )^2

0.263(21 - x )^2 = x

38 - 11x - 0.263x^2 = x

0.263x^2 + 12x - 38 = 0

x=2.97 atm

At equilibrium, we have;

(21 - 2.97) + 2.97 = 21 atm

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Answer

D. 7-methyl-3-octyne

Explanation

In naming Alkynes, the following rules stand:

Rule 1: Find the longest carbon chain that includes both carbons of the triple bond.

Rule 2: Number the longest chain starting at the end closest to the triple bond. A 1-alkyne is referred to as a terminal alkyne and alkynes at any other position are called internal alkynes.

Rule 3: After numbering the longest chain with the lowest number assigned to the alkyne, label each of the substituents at its corresponding carbon. While writing out the name of the molecule, arrange the substituents in alphabetical order. If there are more than one of the same substituents use the prefixes di, tri, and tetra for two, three, and four substituents respectively. These prefixes are not taken into account in alphabetical order.

The give alkyne has 8 longest carbon chain that includes the carbons with the triple bond. Carbon number 3 has the triple bond and a methyl substituent is bonded to carbon number 7 as shown below:

8 carbon chain with triple bond on carbon 3 -the parent name will be 3-octyne.

A methyl substituent is on carbon 7. Hence the name of the alkyne will be: 7-methyl-3-octyne.

Answer:D. 7-methyl-3-octyne

Answer:

a. Each set of elements was arranged in special coloumns based on their mass.

Answer:

proton = 75

electron = 75

neutron = 75

Explanation:

because

proton = electron = atomic number

neutron = mass number - proton

plz follow me

Answer:

To convert 675000 to scientific notation, we need to express it in the form a × 10^n, where a is a number between 1 and 10 (but not 10 itself), and n is an integer.

Starting with 675000, we can divide by 10 repeatedly until we get a number between 1 and 10.

675000 ÷ 10 = 67500 (one division by 10)

67500 ÷ 10 = 6750 (two divisions by 10)

6750 ÷ 10 = 675 (three divisions by 10)

Now we have a number between 1 and 10 (namely, 6.75), and we know that we divided by 10 three times, so the exponent is -3.

Therefore, we can express 675000 in scientific notation as:

6.75 × 10^5

(Note that we could also express it as 6.75 × 10^2 × 10^3, but this is not in standard scientific notation, which requires the coefficient to be between 1 and 10.)

Answer:

The empirical formula for C12 H24 O6 is C2 H4 O.

Answer:

We are given the formula of the compound:

C12H24O6

The empirical formula of a molecular formula is the lowest whole number ratio between the number of atoms of each element

The ratio of C to H to O in the given formula is :

12 : 24 : 6

we notice that all 3 of the numbers have 6 in common. Dividing all three of the numbers by 6, we get:

2 : 4 : 1

Hence, the ratio of Carbon to Hydrogen to Oxygen in the empirical formula of the given compound is 2 : 4 : 1 ,

Empirical Formula = C2H4O

The balanced equation for the redox reaction between zinc and hydrochloric acid (HCl) that forms zinc(II) ions and hydrogen gas is as follows:

Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)

A redox reaction is a type of chemical reaction in which some of the atoms have their oxidation number changed.

According to this question, the redox reaction between zinc and hydrochloric acid (HCl) forms zinc(II) ions and hydrogen gas. The balanced equation is as follows:

Zn(s) + 2H+(aq) → Zn2+(aq) + H2(g)

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In the rock strata correlation practice for New York State, you'll need to label each box with a number, with number 1 representing the oldest layer, located at the bottom.

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The mass of 2.40 × 10²³ molecules of anonymous substance with molar mass of 18.02g/mol is 7.18grams.

The mass of a substance can be calculated by multiplying the number of moles in the substance by its molar mass as follows:

mass = no of moles × molar mass

First, we convert the number of molecules in the anonymous substance to moles as follows:

2.40 × 10²³ ÷ 6.02 × 10²³ = 0.39moles

mass of anonymous substance = 0.39 moles × 18.02g/mol = 7.18grams

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The names of the positions are called:

(1) (10) Atomic number

(2) (11) Chemical symbols

(3) (12) Elements

(4) (13) Atomic mass

Atomic structure refers to the composition and arrangement of subatomic particles within an atom. An atom consists of a central nucleus, which contains positively charged protons and uncharged neutrons, surrounded by negatively charged electrons that move around the nucleus in shells or energy levels.

The number of protons in the nucleus determines the atomic number and thus the identity of the element. The arrangement of electrons around the nucleus determines the chemical and physical properties of the element.

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The questions are:

10 What is the name for the number in this position called? (the answer is not "6") →6

11 What is the name for the letter in this position called? (the answer is not "C"!) →C

12 What is the name in this position called? (the answer is not "Carbon"!) →Carbon

13

What is the name for the number in this position? (the answer is not "12.0") →12.0

Use the spaces below to type your answers to the questions above.

Answer:

123.0*12.35/(0.05*6.049)

first do in small bracket 123.0*12.35/0.30245

and then divide 123.0*40.83319557

and multiply 5022.483055

Approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

To determine the number of molecules of HCl required to form 34.52 g of MgCl₂, we need to use the molar mass and stoichiometry of the balanced equation:

Mg(OH)₂(s) + 2 HCl(aq) → 2 H₂O(l) + MgCl₂(aq)

The molar mass of MgCl₂ is 95.21 g/mol.

First, we need to calculate the number of moles of MgCl₂ formed:

Moles of MgCl₂ = mass of MgCl₂ / molar mass of MgCl₂

Moles of MgCl₂ = 34.52 g / 95.21 g/mol

Moles of MgCl₂ = 0.363 mol

According to the balanced equation, the stoichiometric ratio between HCl and MgCl₂ is 2:1. Therefore, the moles of HCl required can be calculated as follows:

Moles of HCl = 2 * Moles of MgCl₂

Moles of HCl = 2 * 0.363 mol

Moles of HCl = 0.726 mol

To calculate the number of molecules, we need to use Avogadro's number, which is approximately 6.022 x 10^23 molecules/mol.

Number of molecules of HCl = Moles of HCl * Avogadro's number

Number of molecules of HCl = 0.726 mol * 6.022 x 10^23 molecules/mol

Number of molecules of HCl = 4.37 x 10^23 molecules

Therefore, approximately 4.37 x 10^23 molecules of HCl would be required to form 34.52 g of MgCl₂.

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Answer:

See explanation

Explanation:

PO4{3-} is phosphate
Sulfite's formula is SO3{2-}
Sulfate is SO4{2-}
OH- is hydroxide
Note: {x±} signifies the charge of the entire molecule

The polyatomic ions in question are phosphite ion, sulfite ion, and sulfate ion.

The formula PO3−4 represents the polyatomic ion called phosphite ion. It is composed of one phosphorus atom bonded to three oxygen atoms. The name of the sulfite ion is SO3−2, and it consists of one sulfur atom bonded to three oxygen atoms. Lastly, the sulfate ion has the formula SO4−2, and it is composed of one sulfur atom bonded to four oxygen atoms.

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Explanation:

kinetic energy = ½mv²

1800 = ½ × m × 11.2²

1800 = ½ × m × 125.44

3600 = 125.44m

m = 3600/125.44

m = 28.7 Kg

The simplified expression for the given expression is:40T^2 × T^98 × (4^181) / 4^67

Given expression : (4^-3)^-3 × (4^0)^-9 × (4^6)^-3 × (-4)^-49 × (2T)^2 × (T^2)^49 × (-4)^181 × 40To simplify the given expression, we use the following properties of exponents : For any real numbers a, b and n, we have ;a^-n = 1/a^n and a^n × a^m = a^(n+m)Let's simplify each term of the given expression one by one:(4^-3)^-3 = 4^(9) because when a negative exponent is raised to another negative exponent, it becomes positive. (4^-3)^-3 = 4^(-3×-3) = 4^(9)(4^0)^-9 = 4^0 = 1 because any number raised to the power of 0 is equal to 1(4^6)^-3 = 4^(-6×3) = 4^(-18) because when a negative exponent is multiplied by another negative exponent, it becomes positive.(-4)^-49 = -1/(4^49) because when a negative exponent is raised to another negative exponent, it becomes positive and also negative.(-4)^181 = (4^181) because when an odd negative power of a negative number is raised to another power, it becomes negative.40 = 40 as it is(2T)^2 = 4T^2(T^2)^49 = T^(2×49) = T^98(-49) = -49 as it is Now let's simplify the given expression:1 × 1/(4^49) × 4^(-18) × 40 × 4T^2 × T^98 × (4^181)40 and 4^-18 can be simplified and combined as follows:1/(4^49) × 4^(-18) × 40 = 40/(4^49 × 4^18) = 40/4^(49+18) = 40/4^67.

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Answer:

C. results when an alkaline-earth metal loses one of its outermost electrons

Explanation:

An ion can be said to result when an alkaline - earth metal loses one of its outermost electrons.

Ions are charged substances that takes part in chemical reaction.

When there is an inequality between the number of protons and electrons within an atom, an ion forms.

Explanation

Ionic solids, such as sodium chloride (NaCl) are composed of positive and negative ions that are held together by electrostatic attractions, which can be quite strong.

Many ionic crystals also have high melting points. This is due to the very strong attraction between the ions.

Although they are hard they also tend to be brittle, and they shatter rather than bend. Ionic solids do not conduct electricity; however, they do conduct when molten or dissolved because their ions are free to move. Many simple compounds formed by the reaction of a metal and a nonmetal element are ionic.

Answer: b. Ionic

Answer:

linear electron and molecular geometry with a bond angle of 180 degrees and a hybridization of Sp

Explanation:

The structure of Arg-Ile-Tyr is given below:

Peptides make up short chains of amino acids, which act as the fundamental units for building proteins. Within these chains, peptides usually consist of no more than 50 amino acids in contrast to proteins that are made up of significantly longer structures.

Found throughout various sources such as plants, animals, and bacteria, peptides play crucial roles in multiple biological processes including signaling, enzyme activity, and immune response.

Additionally, artificially synthesized peptides serve several purposes within the medicine, cosmetics, and food industries. Scientists are also exploring certain peptide's potential therapeutic advantages mainly pertaining to anti-inflammatory, antimicrobial, and anticancer activities.

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Draw a structural formula for the major product of the reaction shown:

The structural formula for the major product (2-butene) of the given reaction is as follows:$$\ce{CH3CH2CH=CH2}$$

The given reaction is an acid-catalyzed dehydration reaction.

During the reaction, the hydroxyl group (OH) and the adjacent hydrogen atoms (H) on the reactant alcohol (2-butanol) undergo dehydration (loss of water) to form an alkene (2-butene) as the major product.

The reaction is shown below:$$\ce{CH3CH2CH2CH2OH + H2SO4 ->[\Delta] CH3CH2CH=CH2 + H2O}$$To draw the structural formula for the major product of the given reaction, we need to consider the following points:

1. The reactant alcohol (2-butanol) is a four-carbon alcohol with the hydroxyl group (OH) attached to the second carbon atom (C2) of the chain.

2. The product alkene (2-butene) will be a four-carbon alkene with a double bond between the second and third carbon atoms (C2 and C3) of the chain.

The other two carbon atoms will have a single bond with the adjacent carbon atoms and a hydrogen atom each attached to them.

3. The major product will be formed via the elimination of water (dehydration) between the hydroxyl group (OH) and the adjacent hydrogen atoms (H) on the second carbon atom (C2) of the reactant alcohol (2-butanol).

4. The acid catalyst (H2SO4) does not participate in the reaction and remains unchanged. It only facilitates the formation of the alkene by providing a proton (H+) to the hydroxyl group (OH) and a medium for the elimination of water.

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The body of scientific knowledge is based on different Observations (Option C).

Observations in the scientific method are fundamental because it is the first step to raising scientific questions that may be explained through plausible hypotheses. Subsequently, hypotheses must be tested by experimental procedures.

In conclusion, the body of scientific knowledge is based on different Observations (Option C).

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Answer:

its sodium hydroxide

Explanation:

For Test One, phenotype ratio is Short fur : Long fur = 2 : 0; For Test Two, the phenotype ratio is Short fur : Long fur = 3 : 1; For Test Three, the phenotype ratios will be Short fur : Long fur = 0 : 2

For Test One:

Parent 1: FF (homozygous dominant for short fur)

Parent 2: Ff (heterozygous for short fur)

The Punnett square for this cross will give the following genotype ratios:

FF : Ff = 1 : 1

And the corresponding phenotype ratios will be:

Short fur : Long fur = 2 : 0 or 100% short fur

For Test Two:

Parent 1: Ff (heterozygous for short fur)

Parent 2: Ff (heterozygous for short fur)

The Punnett square for this cross will give the following genotype ratios:

FF : Ff : ff = 1 : 2 : 1

And the corresponding phenotype ratios will be:

Short fur : Long fur = 3 : 1 or 75% short fur and 25% long fur

For Test Three:

Parent 1: ff (homozygous recessive for long fur)

Parent 2: ff (homozygous recessive for long fur)

The Punnett square for this cross will give the following genotype ratios:

ff : ff = 1 : 0

And the corresponding phenotype ratios will be:

Short fur : Long fur = 0 : 2 or 100% long fur

For this investigation, the test variable is the breed of hamster and the outcome variable is the phenotype of the hamster.

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The mass of an iridium sample which absorbs 895J of energy when its temperature increases by 12.3°C is 234.72g.

The mass of a substance can be calculated using the following calorimetry equation:

Q = mc∆T

Where;

According to this question, an iridium sample absorbs 895J of energy when its temperature increases by 12.3°C. The mass can be calculated as follows:

895 = m × 0.310 × 12.3

895 = 3.813m

m = 234.72g

Therefore, 234.72g is the mass of the iridium sample.

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