2. An Isotope of technetium, mixed with sulphur and colloidally dispersed in water, is frequentyused in diagnosing various medical conditions because it is readily taken up by various tissues Prior to excretion. Explain why this important
mixture is not a true solution.

oxide in a chemical reaction

CuFe2O4 are the products of combining iron (II) and Copper (II) oxide in a Chemical reaction.

The conversion of one or more chemicals into new one or more chemicals is called chemical reaction.

Example: iron reacts with oxygen to form rust.

The final substance of chemical reaction is called product.

Example: CuFe2O4 is the final substance called product when iron (II) and Copper (II) oxide react with each other.

To learn more about chemical reaction here.

https://brainly.com/question/22817140

#SPJ2

Answer:

C. heat the substance to the boiling point.

Answer:

heat the substance

Explanation:

Explanation:

Ammonia is produced by the reaction of nitrogen and hydrogen according to the equation

N2(g) + 3H2(g) → 2NH3(g)

Calculate the mass of ammonia produced when 27.0 g of nitrogen react with 12.0 g of hydrogen.

g NH3

Which is the excess reactant and how much of it will be left over when the reaction is complete?

Explanation:

Hypothesis is answer.

Have a great day

A nuclear scientist because they are more focused on extracting the nuclear energy of atoms.

Answer:

Ba²+ (aq) + SO4²- (aq) --> BaSO4(s)

The net ionic equation for the formation of barium sulphate is Ba²⁺₍aq₎ + SO₄² ₍aq₎ → BaSO₄₍s₎. Therefore, option D is correct.

The inorganic substance having the chemical formula BaSO₄ is called barium sulfate. It is a tasteless, crystalline white substance that is insoluble in water. The main commercial source of barium and the materials made from it is the mineral barite, which is where it naturally occurs.

The use of barium sulfate aids in the diagnosis or discovery of issues with the esophagus, stomach, and bowels. It is a contrast material for radiography. To make the various bodily components clearly visible, contrast chemicals are used.

A barite-derived metallic compound with a silvery white color. In barium swallows and barium enemas, it is diluted with water to aid visualize the digestive tract on an x-ray.

Thus, option D is correct.

To learn more about barium sulphate, follow the link;

https://brainly.com/question/22119786

#SPJ2

Answer:

MedlinePlus Drugs Information

Explanation:

Promethazine is in a class of medication called phenothiazines

Thermometers are used to measure temperatures. The temperature of the hot junction of the thermocouple is [tex]520^oC[/tex]

Given that:

[tex]EMF = 15mv[/tex]

[tex]T_1 =20^oC[/tex] --- Temperature at cold junction

[tex]s = 0.03mv/^oC[/tex] ---- Sensitivity

The temperature [tex]T_2[/tex] at the hot junction is calculated as follows:

[tex]T_2 = \frac{EMF}{s} + T_1[/tex]

So, we have:

[tex]T_2 = \frac{15mv}{0.03mv/^oC} + 20^oC[/tex]

[tex]T_2 = \frac{15}{0.03/^oC} + 20^oC[/tex]

[tex]T_2 = \frac{15}{0.03}^oC + 20^oC[/tex]

[tex]T_2 = 500^oC + 20^oC[/tex]

[tex]T_2 = 520^oC[/tex]

Hence, the temperature of the hot junction of the thermocouple is [tex]520^oC[/tex]

Read more about thermometers at:

https://brainly.com/question/13271366

Answer:

2NaOH + CO2 -> Na2CO3 + H2O

1) Find the moles of each substance

[tex]\eq n(NaOH)=\frac{35.0}{22.99+16.00+1.008\\}\ =\frac{35.0}{39.998} \ = 0.8750437522 moles\\n(CO_{2} ) = \frac{17.5}{12.01+32.00} = \frac{17.5}{44.01} = 0.3976369007 moles\\[/tex]

2) Determine the limitting reagent

[tex]\\NaOH = \frac{0.8750437522}{2} = 0.4375218761\\\\[/tex]

∴ Carbon dioxide is limitting as it has a smaller value.

3) multiply the limiting reagent by the mole ratio of unknown over known

n(H2O ) = 0.3976369007 × 1/2

             = 0.1988184504 moles

4) Multiply the number of moles by the molar mass of the substance.

m = 0.1988184504 × (1.008 × 2 + 16.00)

   = 0.1988184504 × 18.016

   = 3.581913202 g

Explanation:

The correct answer is = 3.581913202 g.

n(H2O ) = 0.3976369007 × 1/2

             = 0.1988184504 moles

  m = 0.1988184504 × (1.008 × 2 + 16.00)

      = 0.1988184504 × 18.016

      = 3.581913202 g.

H2O is the molecular formula of water, also called Dihydrogen monoxide. H2O symbolises two hydrogen atoms and one oxygen atom.

Water (H2O) is made from 2 atoms of hydrogen and 1 atom of oxygen. A mole of water molecules would be 2 moles of hydrogen atoms plus 1 mole of oxygen atoms. From the periodic table, we see the atomic weight of hydrogen is 1.0079 and the atomic weight of oxygen is 15.9994.

Learn more about What is 1 mol H2O? here:  https://brainly.com/question/2003415

#SPJ2

Answer:

50000 g

Explanation:

1 kilogram (kg) is equal to 1000 grams (g).

1 kg = 1000 g

The mass m in grams (g) is equal to the mass m in kilograms (kg) times 1000:

m(g) = m(kg) × 1000

Answer:

A. The relationship between the Sun,Moon,and Earth

Explanation:

Answer:

ज

Explanation:

ूअूिkzkzkksksosawwhsusisisisisisiisisisisisisiisisisis

Answer:

D. Add acid to water, not water to acid

Answer:

Not sure but I think it is C!

Explanation:

Explanation:

For Mg, (1.2 g Mg/24 g Mg) = 0.05 mol Mg.

For Cl, (3.55 g Cl/35.5 g Cl) = 0.1 mol Cl

So the ratio now is

Mg:Cl = 0.05 : 0.1 = 1:2

I got the 1:2 ratio by dividing both by the smallest number, which is 0.05 mol. Therefore, the empirical for formula of the substance is [tex]MgCl_2[/tex]

The empirical formula of the compound formed when magnesium reacts with chlorine is MgCl₂.

To determine the empirical formula of the compound formed when magnesium (Mg) reacts with chlorine (Cl), we need to find the ratio of the elements in terms of moles.

First, we calculate the number of moles of each element:

Moles of Mg = Mass of Mg / Molar mass of Mg

Moles of Mg = 1.2 g / 24 g/mol

Moles of Mg = 0.05 mol

Moles of Cl = Mass of Cl / Molar mass of Cl

Moles of Cl = 3.55 g / 35.5 g/mol

Moles of Cl = 0.1 mol

Next, we determine the simplest whole-number ratio between the moles of Mg and Cl:

Mg:Cl = 0.05 mol : 0.1 mol

To simplify the ratio, we divide both values by the smaller value (0.05 mol in this case):

Mg:Cl = 0.05 mol / 0.05 mol : 0.1 mol / 0.05 mol

Mg:Cl = 1 : 2

Therefore, the empirical formula of the compound formed when magnesium reacts with chlorine is MgCl₂.

Learn more about empirical formula from the link given below.

https://brainly.com/question/32125056

#SPJ2

The groups are alkali metals (I), alkaline earth metal (II) , Halogen (VII), and noble gases (VIII).

The representative elements, also known as the primary group elements, are found in Group A. As a result, the columns beginning with A (IA through VIIIA) are referred to as the primary group elements. The periodic table's columns were referred to as groups.

To know more about group.

https://brainly.com/question/13219625

#SPJ2

Answer:A

Explanation:

Answer:

because it has the same number of protons as electrons.

Explanation:

Lithium sulfide

if my answer helps you than mark me as brainliest.

The Earth’s tilt changes its position relative to the stars and constellations as the Earth rotates around its axis.

Answer:

2.98 g CO2

Explanation:

1. Balance the chemical equation

1 Fe2O3 + 3CO ->  2Fe + 3CO2

2. Use periodic table to find mass from each CO2 and Fe2O3  

3. Calculate

3.60 g Fe2O3 x [tex]\frac{1 mol Fe2O3}{159.69 g Fe2O3}x\frac{3 mol CO2}{1 mol Fe2O3}[/tex] x[tex]\frac{44.01 g CO2}{1 mol CO2}[/tex] =  2.98 g CO2

The grams of CO, produced when 3.60 g of Fe 0 reacts with excess CO is 2.98 grams Co2.

Mass is the quantity of matter of a physical body.

The balanced equation is

[tex]\rm Fe_2O_3 + CO - > Fe + CO_2[/tex]

The calculation is

[tex]3.60 g \;Fe_2O_3 \times \dfrac{ 1 mol\;Fe_2O_3}{159.69} \times \dfrac{3 mol CO_2}{1 mol \;Fe_2O_3 } \times \dfrac{44.01\;CO_2}{1 mol\; CO_2} = 2.98 g\;CO_2[/tex]

Thus, the grams of CO, produced when 3.60 g of Fe 0 reacts with excess CO is 2.98 grams Co2.

Learn more about mass

https://brainly.com/question/19694949

#SPJ2

Answer:

[tex]\boxed {\boxed {\sf 2.001 \ mol \ Al_2O_3}}[/tex]

Explanation:

We are asked to convert grams of aluminum oxide to moles. We will do this using the molar mass or mass of 1 mole of a substance. The values are found on the Periodic Table. They are equal to the atomic masses, but the units are grams per mole instead of atomic mass units.

We have the compound aluminum oxide or Al₂O₃. We must look up the molar masses of the individual elements: aluminum and oxygen.

The formula of the compound has subscripts (a subscript of 2 after Al and subscript of 3 after O). There are 2 moles of aluminum and 3 moles of oxygen in 1 mole of aluminum oxide. We must multiply the molar mass by its subscript.

We convert using dimensional analysis, so we set up a ratio using the molar mass.

[tex]\frac {101.960076 \ g \ Al_2O_3}{ 1 \ mol \ Al_2O_3}[/tex]

We are converting 204.0 grams to moles, so we multiply by this value.

[tex]204.0 \ g \ Al_2O_3 *\frac {101.960076 \ g \ Al_2O_3}{ 1 \ mol \ Al_2O_3}[/tex]

Flip the ratio so the units of grams of aluminum oxide cancel.

[tex]204.0 \ g \ Al_2O_3 *\frac { 1 \ mol \ Al_2O_3}{101.960076 \ g \ Al_2O_3}[/tex]

[tex]204.0 *\frac { 1 \ mol \ Al_2O_3}{101.960076}[/tex]

[tex]\frac {204.0}{101.960076} \ mol \ Al_2O_3[/tex]

[tex]2.00078313 \ mol \ Al_2O_3[/tex]

The original measurement of grams has 4 significant figures, so our answer must have the same. For the number we found, that is the thousandth place. The 7 in ten-thousandth place tells us to round the 0 up to a 1.

[tex]2.001 \ mol \ Al_2O_3[/tex]

204.04 grams of aluminum oxide is equal to approximately 2.01 moles of aluminum oxide.

Lanthanoids and actinoids are transition elements of the periodic table. These elements are lustrous and malleable and can conduct thermal energy and electricity. Thus, option A is correct.

Lanthanoids and actinoids are the terms used to refer to the elements of the f-block of the periodic table that are placed separately due to the difference in their electronic structures.

These elements show the property somewhat similar to that of the metals and hence are lustrous and malleable. Due to the transition electron phase, they are used in optical devices and cardiac pacemakers.

The lanthanoids and actinoids are good conductors of heat and electricity as their electrons can be transferred and carry charges like metals.

Therefore, option A. the lanthanoids and actinoids are conductors and are malleable.

Learn more about actinoids here:

https://brainly.com/question/14322602

#SPJ2

Answer:

the answer of this question is B

Answer:

if its under 7 then it's an acid you neek over 7 is alkaline

Answer:

Hi, There! the Correct Answer is below!

C.)interactions between humans and living and non-living things in the environment

Explanation:

Environmental scientists study subjects like the understanding of earth processes, evaluating alternative energy systems, pollution control and mitigation, natural resource management, and the effects of global climate change. ... Environmental scientists bring a systems approach to the analysis of environmental problems.

____________________________________________________________

Have a wonderful Day :)

~Darkspirit~

Answer:

interactions between human and living and non living things in the environment

Answer:

Explanation:

0.0

Answer:

In this type of solution, perchloric acid is a strong acid which means that its conjugate base is extremely weak. As such, the solution of HClO4 H C l O 4 and NaClO4 N a C l O 4 is not a buffer solution.