a rock is found to have a small amount of copper would you call the rock an ore of copper explain in 5-6 sentences

Determining Molar Mass

Use the periodic table to calculate the molar mass of each of the following compounds. Each answer must have 2 decimal places.

Answer:

- Ammonia ( NH 3 ): 17.04 g/mol is CORRECT :)

- Magnesium hydroxide (MG(OH)2): 58.33 g/mol is CORRECT :)

- Iron (lll) oxide (Fe2O3): 159.70 g/mol is CORRECT :)

Solution:

Got it right on EDGE. Hope this helps <3

The molar mass of the following compounds in two decimal places are as follows:

The molar mass of a compound is the sum of all the atomic masses of the elements that constitutes the compound.

According to this question, three compounds were given as follows: NH3, Mg(OH)2 and Fe2O3.

The atomic mass of the elements in this compounds are as follows:

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Calculate electrons

Total electrons=10+2=12

The element is Magnesium with symbol Mg as atomic no is 12

Additional:-

M:-

Excited state of magnesium

When we do the respective division operation we get the following result 0.171802.

When we do the respective division operation we get the following result 0.171802. But we must adjust the significant figures taking into account the number that has less significant figures, which is 5.68.

5.68 has three significant figures. So we will adjust the significant figures of the result to three.

0.97584 / 5.8 = 0.1718 = 0.172

Answer:

Test for an odor. The nonpolar substance should have a higher volatility and stronger odor because of its London dispersion forces.

Explanation:

To help Ming identify the non-polar compound, assuming the non-polar compound will have an odor test for it and most importantly, the non-polar substance should have a higher volatility due to its London dispersion forces.

Answer:

B

Explanation:

827.0 torr  is the total pressure, in torr, exerted by the gas mixture

The partial pressures of the individual gases make up the total pressure of the gas mixture.

Total pressure= sum of all partial pressure

Total pressure=423+149+255

Total pressure= 827.0 torr

Pressure is defined as force/area. To illustrate the pressure from snow on a roof, divide the weight of the snow by the surface area of the roof. Gases are a typical pressure source in chemistry. A "vacuum" is used to describe the absence of pressure. Humans have long held the belief that vacuums are both improbably rare and unnatural because "nature abhors a vacuum." Actually, this is not the case.

The number of pressure units is ridiculous. It's common to use the torr or mmHg unit. This discussion is solely focused on the height of a mercury column. The atmosphere contains 760 torr, or mmHg. You might also look at mmH2O, which makes use of a related idea.

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The electron geometry of XeF2 is linear (option c). In XeF2, xenon (Xe) is the central atom, and it has two bonding pairs and three non-bonding pairs of electrons around it. The arrangement of these electron pairs is linear, which means they are positioned in a straight line.

To determine the electron geometry, we consider both the bonding and non-bonding electron pairs. In this case, the three non-bonding pairs of electrons exert repulsion on each other and cause the bonding pairs to spread out in a linear fashion. The repulsion between the electron pairs results in a linear electron geometry.

In the case of XeF2, the molecular geometry is also linear since there are only two bonding pairs and no lone pairs around the central atom. Therefore, the correct answer is linear (option c) for the electron geometry of XeF2.

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steps that are followed in taking a stratified random sample are

i. Take a sample of size n/k from each strata, where n is the sample size and k is the number of strata

iv. Take a systematic sample from the population as a whole. Take random samples from each strata.

Stratified random sampling is a sampling method that divides the population into smaller groups called layers. Groups or hierarchies are organized based on the common characteristics or attributes of the members in the group. The process of dividing the population into groups is called hierarchization.

Stratified Random Sample Example:

Suppose a research team wants to determine a GPA for a college student in the United States. The research team is having a hard time collecting data from all 21 million college students. We decided to use 4,000 students to extract a random sample of the population.

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Predator - Lions (any animal that preys upon other animals)

Scavenger - Vultures (any animal that consumes decaying flesh)

Decomposer - Worms/ Fungi (any organism that breaks down dead organisms into smaller particles and creates new compounds such as nutrients for plants)

If 30 ml of a 0.80 m solution of k is mixed with 50 ml of a 0.45 m solution of clo−4, a precipitate will be observed in this solution.

The solution contains k (potassium) and clo−4 (chlorate) ions and we are to find out if a precipitate will form or not. The ksp for the following equilibrium is 0.004. kclo4(s)↽−−⇀k (aq) clo−4(aq)

We can obtain the molarity of k ions as follows: 0.80 M = (moles of K)/(0.030 L)Moles of K = 0.80 M × 0.030 L = 0.024 mol

We can obtain the molarity of clo−4 ions as follows: 0.45 M = (moles of clo−4)/(0.050 L)Moles of clo−4 = 0.45 M × 0.050 L = 0.0225 mol

The concentration of K and clo−4 ions are 0.8 M and 0.45 M respectively. Now, we need to calculate the reaction quotient Q of the solution to find out whether the precipitate will form or not. Q = [K+][clo−4] = 0.8 M × 0.45 M = 0.36

Since Q (0.36) > Ksp (0.004), the reaction quotient is greater than the solubility product constant. It indicates that the product is more than what it should be. The excess products will precipitate to form a solid. Hence, we can say that a precipitate will be observed in this solution.

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Answer:

36.5 g CO2

Explanation:

First, Write a Balanced Equation  

C   + 2 ZnO → CO2  + 2 Zn

Useful Information,  

MW of ZnO = 81.41 g

MW of CO2 = 44.01 g

135 g ZnO x (1 mol ZnO /  81.41 g ZnO) x (1 mol CO2/2 mol ZnO) x ( 44.01 g CO2 / 1 mol CO2 ) = 36.5 g CO2

The leftovers of \(C_2H_2\) will be 6 moles while the leftover of \(O_2\) will be zero.

In the originally balanced equation of the reaction, 2 moles of \(C_2H_2\) and 5 moles of \(O_2\) react completely to produce 4 moles of \(CO_2\) and 2 moles of \(H_2O\). This equation is balanced with no reactant left.

Now, 8 moles of \(C_2H_2\) were made to react with 5 moles of \(O_2\) in the second reaction. The mole ratio of the two reactants for complete reactions is 2:5. Thus, \(C_2H_2\) has been supplied in excess.

Since only 5 moles of \(O_2\) is available, only 2 moles of \(C_2H_2\) will be consumed. Thus, 6 moles of \(C_2H_2\) will be left while the oxygen will be completely consumed. That is, the amount of \(O_2\) left would be zero.

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Answer:

By forming an activated complex with lower energy.

Explanation:

When catalyst is added to a reaction , it forms  an activated catalyst which has lower activation energy . So initiation of reaction requires less energy and reaction becomes fast .

Hence third option is correct.

The oxidizing agent is dependent on the standard reduction potential of the substance. As the reduction potential increases, the oxidizing tendency of the substance would be increased. The oxidizing agent is the substance that oxidizes others and gets reduced itself.

In a redox chemical process, an oxidizing agent is a material that "accepts" or "receives" an electron from a reducing agent (also known as an oxidant, oxidizer, electron recipient, or electron acceptor) (called the reductant, reducer, or electron donor). Any chemical that oxidizes another substance is thus an oxidant. By stating that oxidizers "undergo reduction" and "are reduced" whereas reducers "undergo oxidation" and "are oxidized," it is reasonable to deduce that the amount of electron loss for the oxidizer reduces while it increases for the reductant. The three main oxidizing agents are oxygen, hydrogen peroxide, and halogens.

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There are 1.31 x 1022 bromide ions in 2.00 g of \(MgBr_2\).

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Answer:true

Explanation:

i did the same question a minute ago :>

Answer:

D

Explanation:

Answer:

C. Structure

Explanation:

Most water on Earth contains dissolved solvents because of water's polarity. Water is polar because of the polar covalent bond between hydrogen and water.This allows water to separate polar solutes and is what makes it such a good solvent. It is known as the universal solvent because it is capable of dissolving more substances than any other.

Answer:

Volcanoes form when tectonic plates collide and one plate is pushed beneath another.

Explanation:

The correct order of the increasing polarity of the analyte functional group isEthers < Esters.

The given statement is "Polarities of analyte functional group increase in the order of hydrocarbon ethers < esters."  The order of polarities of functional groups is the order of their increasing polarity (i.e., less polar to more polar) based on their electron-donating or withdrawing ability from the rest of the molecule.Polarity of analyte: The analyte's polarity is directly proportional to the dipole moment of the functional group, which is associated with a difference in electronegativity between the atoms that make up the functional group.The electronegativity of an element is its ability to attract electrons towards itself. The greater the difference in electronegativity between two atoms, the more polar their bond, and hence the greater the polarity of the molecule.

To find the correct order of the increasing polarity of the analyte functional group, let's first compare the two groups: hydrocarbon ethers and esters. Here, esters have a carbonyl group while ethers have an oxygen atom with two alkyl or aryl groups. The carbonyl group has more electronegative oxygen, which pulls electrons away from the carbon atom, resulting in a polar molecule. On the other hand, ethers have a less polar oxygen atom with two alkyl or aryl groups, making them less polar than esters. Therefore, the correct order of the increasing polarity of the analyte functional group isEthers < Esters.

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By considering the solubility rules, we can determine whether a precipitate will form and its empirical formula when mixing two aqueous solutions.

The table can be completed as follows(image attached):

To determine whether a precipitate will form when solutions A and B are mixed, we need to consider the solubility rules of the compounds involved. If the product of the ions in the solution is insoluble, then a precipitate will form.

In the first case, potassium sulfide (K2S) and iron(II) sulfate (FeSO4) will react to form potassium sulfate (K2SO4) and iron(II) sulfide (FeS), which is insoluble. Thus, a precipitate will form with empirical formula FeS. In the second case, both zinc sulfate (ZnSO4) and iron(II) bromide (FeBr2) are soluble in water and will not react to form an insoluble compound. Therefore, no precipitate will form.

In the third case, barium bromide (BaBr2) and potassium acetate (KC2H3O2) will react to form barium acetate (Ba(C2H3O2)2) and potassium bromide (KBr), which is soluble. However, barium acetate is insoluble and will form a precipitate with empirical formula Ba(C2H3O2)2.

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Oxygen has a relatively low solubility coefficient and therefore requires a steep (high) partial pressure gradient to help diffuse the gas into the blood.

Solubility is described as the limiting amount of an element that can dissolve in any amount of solvent at a set temperature. Since oxygen has a low coefficient of this, it requires the help of a higher partial pressure gradient to diffuse properly into the bloodstream.

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Answer:

Pacific Ocean

Explanation:

According to the given statement 0.3345 M  is the molarity of the Ba(OH)₂ solution.

The quantity of a substance in a specific solution volume is known as its molarity (M). The amount of moles of a solute every litre of a solution is referred to as molarity. The molecular concentration of a solution is another name for molarity.

Ba(OH)₂+  2HCl ⇒ BaCl₂ + H₂O

Ratio of moles Ba(OH)₂ ,  

HCl  = 1:2

Amount of HCl consumed

= 0.500/1000*66.90

= 0.03345 mol

So Ba(OH)₂ reacted = 1/2 * 0.03345 mol

If  molarity of Ba(OH)₂ is x then

x/1000*50 = 1/2 * 0.03345

x =  0.3345 M.

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Answer: Hello i am confused are you asking a question?

Explanation:

Based on Lana's diagram, the correct statement that explains the results of asexual reproduction is C. The offspring are genetically identical to the parent, because each offspring receives a complete copy of a single parent's chromosomes.

In the diagram, the parent cell divides into two identical daughter cells, each of which contains a complete copy of the parent cell's genetic material.

This type of reproduction, where a single parent produces offspring that are genetically identical to itself, is called asexual reproduction. It is the process by which many unicellular organisms, such as bacteria and some protists, reproduce.

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Answer:

\(\huge\boxed{\sf 160\ g}\)

Explanation:

Here,

Half life = 3

Sample Amount left = 20 g

Before 3rd half-life:

= 20 × 2

= 40 g

Before 2nd half-life:

= 40 × 2

= 80 g

Before 1st half-life:

= 80 × 2

So, the initial amount of sample was 160 grams.

\(\rule[225]{225}{2}\)

The volume of the granite was determined by water displacement and is found to be 9.35 ml. The volume of granite in cm³ is 9.35 cm³

We know that, 1 ml = 1 cm³

We need to convert the volume from ml to cm³

The volume of the granite that was determined by water displacement is observed to be 9.35 ml.

After the conversion of volume of granite from ml to cm³, its volume in cm³ would be

1 ml = 1 cm³

9.35 ml = 9.35 cm³

Therefore, the volume of the granite that was determined by water displacement is 9.35 cm³

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Answer:

\(\boxed{\boxed {\sf 23.0 \ g \ Ba(NO_3)_2}}\)

Explanation:

We are asked to find the mass of 5.30 ×10²² formula units of barium nitrate.

First, we convert formula units to moles using Avogadro's Number or 6.022×10²³. This is the number of particles (atoms, molecules, formula units, etc.) in 1 mole of a substance. In this case, the particles are formula units of barium nitrate.

Set up a conversion factor using Avogadro's Number.

\(\frac{6.022 \times 10^{23} \ formula \ units \ Ba(NO_3)_2}{ 1 \ mol \ Ba (NO_3)_2}\)

We are converting 5.30×10²² formula units, so we multiply by this value.

\(5.30 \times 10^{22} \ formula \ units \ Ba(NO_3)_2 *\frac{6.022 \times 10^{23} \ formula \ units \ Ba(NO_3)_2}{ 1 \ mol \ Ba (NO_3)_2}\)

Flip the conversion factor so the units of formula units of barium nitrate cancel.

\(5.30 \times 10^{22} \ formula \ units \ Ba(NO_3)_2 *\frac{ 1 \ mol \ Ba (NO_3)_2}{6.022 \times 10^{23} \ formula \ units \ Ba(NO_3)_2}\)

\(5.30 \times 10^{22} *\frac{ 1 \ mol \ Ba (NO_3)_2}{6.022 \times 10^{23}}\)

\(\frac{5.30 \times 10^{22} }{6.022 \times 10^{23}} \ mol \ Ba(NO_3)_2\)

\(0.0880106276984 \ mol \ Ba(NO_3)_2\)

Next, convert moles to grams using the molar mass. The molar mass of barium nitrate is 261.35 grams per mole.

Set up a conversion factor using the molar mass.

\(\frac{ 261.35 \ g \ Ba(NO_3)_2} {1 \ mol \ Ba(NO_3)_2}\)

Multiply by the number of moles we calculated.

\(0.0880106276984 \ mol \ Ba(NO_3)_2 *\frac{ 261.35 \ g \ Ba(NO_3)_2} {1 \ mol \ Ba(NO_3)_2}\)

The units of moles of barium nitrate cancel.

\(0.0880106276984*\frac{ 261.35 \ g \ Ba(NO_3)_2} {1}\)

\(23.001577549 \ g \ Ba(NO_3)_2\)

If this is rounded to the tenths place, the 0 in the hundredth place tells us to leave the 0 in the tenths place.

\(23.0 \ g \ Ba(NO_3)_2\)

The mass of 5.30 ×10²² formula units of barium nitrate is approximately 23.0 grams.

Answer:

Electrolysis, process by which electric current is passed through a substance to effect a chemical change. ... Electric current (i.e., electrons) enters through the negatively charged electrode (cathode); components of the solution travel to this electrode, combine with the electrons, and are transformed (reduced)

Answer:

by mixing red and yellow

Explanation:

Answer:

Either the sun or by mixing red and yellow together because they make orange.

Explanation:

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