I need help with number 3( for you to help me with number 3 you have to find number 1-2) “Its an assignment”

Answer:

d. 7.7x10^23 molecules

Explanation:

Given the following data:

Mass of water (H2O) = 23g

To find the number of molecules;

First of all, we would determine the number of moles;

\( Number \; of \; moles = \frac {mass}{molar mass} \)

Molar mass of water (H2O) = (1 * 2) + 16 = 18 g/mol

Substituting into the equation, we have

\( Number \; of \; moles = \frac {23}{18} \)

Number of moles = 1.2778 moles

Now, to find the number of water molecules;

We know that Avogadro constant is equal to 6.02 * 10^23 mol¯¹

Number of water molecules = number of H2O moles * Avogadro constant

Substituting into the equation, we have;

Number of water molecules = 1.2778 × 6.02 * 10^23

Number of water molecules = 7.7 × 10^23 atoms.

Answer:

D

Explanation:

From periodic table : proton number 19  corresponds to K  (potassium)

  which is very reactive with water

Answer: Industrial processes including mining and manufacturing historically have been leading causes of soil pollution. Industrial areas typically have much higher levels of trace elements and organic contaminants. This is due to intentional and unintentional releases from industrial processes directly into the environment, including to the soil, adjacent water bodies, and the atmosphere.

Explanation:

First, let's separate both solutions:

We assume solutions are aditive.

Solution 1)

225mL of a 0.200 mol/L calcium bromide

Volume 1 = 225 mL = 0.225 L

Concentration 1 = 0.200 mol/L

Compound = calcium bromide = CaBr2

CaBr => Ca+2 + 2Br- (Bromide ions)

Concentration of bromide ions = 2 x 0.200 mol / L = 0.400 mol/L

Then, the moles of bromide ions = 0.225 L x 0.400 mol/L = 0.09 moles

Bromide ions 1 = 0.0900 moles

----------------------------------------------------------------------------------------------------------------

Solution 2)

We proceed the same as solution 1

Cobalt (III) bromide = CoBr3

CoBr3 => Co+3 + 3Br-

Concentration of Bromide ions = 3 x 0.450 mol/L = 1.35 mol/L

Moles of bromide ions = 1.35 mol/L x 0.155 L (155 mL) = 0.209 moles

Bromide ions 2 = 0.209 moles

---------------------------------------------------------------------------------------------------------------

The mixture of these 2 compounds

Total moles of Bromide ions = 0.0900 moles + 0.209 moles = 0.299 moles

Total volume = 0.225 L + 0.155 L = 0.380 L

Final concentration = 0.299 moles / 0.380 L = 0.787 mol/L

Answer: 0.787 mol/L

Answer:

A heterotroph is an organism that eats other plants or animals for energy and nutrients. The term stems from the Greek words hetero for “other” and trophe for “nourishment.”

The identity of a cation solution that produces a mix of red and yellow colors in a flame test, but appears red when viewed through a cobalt filter, can be attributed to the presence of the strontium (Sr) cation.

During a flame test, different metal cations emit characteristic colors due to the excitation of electrons and their subsequent emission of light. Strontium, in particular, is known to produce a vibrant red color in flame tests.

The presence of both red and yellow colors indicates the possibility of multiple metal cations in the solution. While the specific metal responsible for the yellow color is uncertain, it could potentially be sodium or another metal that emits a yellow flame.

When the flame is viewed through a cobalt filter, which absorbs yellow wavelengths of light, the yellow color is filtered out, resulting in only the red color being observed. Since strontium is known for its distinctive red flame color and its emission is not affected by the cobalt filter, it is likely the metal cation responsible for the observed red color. Therefore, based on these characteristics, the identity of the cation solution is most likely strontium (Sr).

Know more about cation solution here:

https://brainly.com/question/30754382

#SPJ8

Iron + zinc nitrate does not react, therefore you will not see a whole on th iron pan.

However, Iron and silver nitrate do react. Thus a whole will be seen under the saucepan.

(a) Iron + silver nitrate saucepan will have a hole because the two substances react.

(b) The whole appears because Iron reacts with silver nitrate in the following reaction:

This results in hole.

Taking into account the reaction stoichiometry, 1.83 moles of Fe₂O₃ will react with 99.0 g of Al

In first place, the balanced reaction is:

2 Al + Fe₂O₃ → Al₂O₃ + 2 Fe

By reaction stoichiometry, the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

By reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

It is possible to use a simple rule of three as follows: If by reaction stoichiometry 54 grams of Al react with 1 mole of Fe₂O₃, 99 grams of Al react with how many moles of Fe₂O₃?

moles of Fe₂O₃= (99 grams of Al ×1 mole of Fe₂O₃)÷54 grams of Al

moles of Fe₂O₃= 1.83 moles

Finally, 1.83 moles of Fe₂O₃ is needed.

Learn more about the reaction stoichiometry:

brainly.com/question/24741074

#SPJ1

Remember that 1 m equals 100 cm, so the calculation will be:

The answer is 243 cm.

Answer:

Molar Mass of CH2O2 is 46.026

Explanation:

What is the molar mass of CH2O2 ? ( C= 12.01 g/mol, H=1.008 g/mol, O=16.00)

C = 12.01g/mol

H = 1.008g/mol

O = 16g/mol

CH2O2 = 12.01+1.008x2+16x2 = 46.026g/mole

Answer:

1. is Molar (with capital M)

2. is molal (m)

Explanation:

By definition, 1 Molar solutions have 1 mol of solute in 1 L of solution and 1 molal solutions have 1 mol of solute in 1 Kg of solvent

Answer:

(a) Cr3+ and Br- will form CrBr3 (chromium(III) bromide)

(b) Fe3+ and O2- will form Fe2O3 (iron(III) oxide)

(c) Hg22+ and CO32- will form Hg2CO3 (mercury(I) carbonate)

(d) Ca2+ and ClO3- will form Ca(ClO3)2 (calcium chlorate)

(e) NH4+ and PO43- will form (NH4)3PO4 (ammonium phosphate)

Explanation:

chatGPT

The chemical formulas for the compounds formed by the given pairs of ions are: (a) CrBr3, (b) Fe2O3, (c) Hg2(CO3)2, (d) Ca(ClO3)2, and (e) (NH4)3PO4.

(a) Cr3+ and Br- : In order to form a neutral compound, the charges of the ions must balance. The charge of Cr3+ is 3+ and the charge of Br- is 1-. To balance the charges, we need three Br- ions for every Cr3+ ion. Therefore, the chemical formula is CrBr3.

(b) Fe3+ and O2- : The charge of Fe3+ is 3+ and the charge of O2- is 2-. To balance the charges, we need two O2- ions for every Fe3+ ion. Therefore, the chemical formula is Fe2O3.

(c) Hg22+ and CO2- : The charge of Hg22+ is 2+ and the charge of CO2- is 2-. The charges are already balanced, so no extra ions are needed. Therefore, the chemical formula is Hg2(CO3)2.

(d) Ca2+ and ClO3- : The charge of Ca2+ is 2+ and the charge of ClO3- is 1-. To balance the charges, we need two ClO3- ions for every Ca2+ ion. Therefore, the chemical formula is Ca(ClO3)2.

(e) NH4+ and PO3- : The charge of NH4+ is 1+ and the charge of PO3- is 3-. To balance the charges, we need three NH4+ ions for every PO3- ion. Therefore, the chemical formula is (NH4)3PO4.

https://brainly.com/question/36379566

#SPJ3

Answer:

malleability I believe.

Explanation:

Hope this helps and good luck :)

The balanced chemical equation would be Ca(NO3)2(aq) + 2KCl(aq) --> CaCl2(aq) + 2KNO3(aq).

The chemical equation for the given reaction would be:

Ca(NO3)2(aq) + 2KCl(aq) --> CaCl2(aq) + 2KNO3(aq)

In this equation, Ca(NO3)2 (calcium nitrate) reacts with KCl (potassium chloride) to produce CaCl2 (calcium chloride) and KNO3 (potassium nitrate). All the reactants and products are soluble in water, so the phases of all the species are aqueous (aq).

A chemical equation is classified as a no reaction equation if there are no observable products formed or if the reaction does not take place under the given conditions.

More on chemical equations can be found here: https://brainly.com/question/30087623

#SPJ1

To determine the empirical formula of the metal bromide formed, we need to first calculate the amount of chromium reacted and the amount of bromine reacted. The amount of chromium reacted can be calculated using its molar mass, which is 52 g/mol: 19.66 g chromium x (1 mol chromium / 52 g chromium) = 0.378 mol chromium.

Since there is excess bromine, all of the chromium would react with bromine to form the metal bromide. Therefore, the amount of bromine reacted can be calculated using the mass of the metal bromide formed:

110.3 g metal bromide x (1 mol metal bromide / molar mass of metal bromide) = amount of bromine reacted

We don't know the molar mass of the metal bromide yet, but we can use the law of conservation of mass to determine it. The mass of the metal bromide formed must equal the sum of the masses of the chromium and bromine that reacted.

110.3 g metal bromide = 19.66 g chromium + mass of bromine reacted mass of bromine reacted = 90.64 g

Now we can calculate the amount of bromine reacted:

90.64 g bromine x (1 mol bromine / 79.904 g bromine) = 1.133 mol bromine

To determine the empirical formula, we need to find the ratio of the moles of each element in the metal bromide.

Chromium: 0.378 mol
Bromine: 1.133 mol

To get a whole number ratio, we can divide both of these values by the smaller value (0.378 mol):

Chromium: 0.378 mol ÷ 0.378 mol = 1
Bromine: 1.133 mol ÷ 0.378 mol = 3

Therefore, the empirical formula of the metal bromide is CrBr3.

For more questions on:  chromium

https://brainly.com/question/15319379

#SPJ11

Answer: extra-high high tides, and very low, low tides

Explanation: When the sun, moon, and Earth are in alignment (at the time of the new or full moon), the solar tide has an additive effect on the lunar tide, creating extra-high high tides, and very low, low tides—both commonly called spring tides.

First of all, we have a REDOX reaction here because we have loss and gain of electrons. The process of electrolysis is accompanied by the redox reaction.

Explanation:

3Sn(s) + 2NO3–(aq) + 8H+(aq) → 3Sn2+(aq) + 2NO(g) + 4H2O(l)

On the left, we have Sn (s) with an oxidation number equal to 0, then on the right we have Sn+2, so it lost electrons because it gained a positive charge. If we lose electrons, then we have oxidation, and it takes place at the anode. Thus, the anode is composed of tin.

Reaction at the anode:

Sn (s) => Sn+2 (aq) + 2e-

----------------------------------------------------------------------------------------------------------------

We have on the left N in NO3 which oxidation number is +6, and on the left N in NO has +2 as oxidation number.

We can say that the oxidation number decreases from +6 to +2. Therefore, we have a reduction of NO3 and it takes place at the cathode. The cathode is composed of Pt.

Reaction at the cathode:

NO3- (aq) + 4H+ (aq) + 3e- => NO (g) + 2 H2O (l)

---------------------------------------------------------------------------------------------------------------

To get to the complete reaction, we must multiply by 3 the reaction at the anode, and by 2 the reaction at the cathode. After that, we add both reactions together.

the equation is not present.

Explanation:

1. boiling and melting point

2. electrical conductivity

3. Bond strength

4. bond length

A covalent bond consists of negative electrons that are shared in between atoms. Because of this bond, they possess and manifest physical abilities, including electrical pressure/conductivity and lower melting points compared to ionic compounds.

Answer:

P is the limiting reagent

Explanation:

P = phosphorus  = 30.97g/mol

Cl2 = Chlorine = 70.91g/mol

PCl3 = Phosphorus Trichloride = 137.33g/mol

P + Cl2 = PCl3

Left Side

P = 1

Cl = 2

Right Side

P = 1

Cl = 3

So equation needs to be balanced first

2P + 3Cl = 2PCl3

Left Side

P = 2

Cl = 6

Right Side

P = 2

Cl = 6

That's better.

Ok so we have 12.39g of P so we have 0.4 moles of it

We then have 52.54g of Cl so we have 0.74 moles of it

For every P we need 1.5 Cl so we have an excess of Cl

Answer:

the pig's average speed is 7 m/s

The average speed of a moving body is the ratio of the distance travelled to the time of travel. Here, the speed of the pig running 46 meters in 6 seconds is 7.6 m/s.

The speed of an object is a physical quantity that measures the distance travelled by the object per unit time. Hence, it is the ratio of distance travelled to the  time taken for the travel. The rate of speed is called velocity. Bot are having the standard unit of m/s.

Given that,

distance covered by the pig = 46 meters

time taken = 6 seconds

speed  = distance/time.

Average speed of the pig = 46 meters/ 6 seconds = 7.6 m/s.

Therefore, if the small pig runs 46 meters in 6 seconds, it is having an average speed of 7.6 m/s.

Find more on average speed :

https://brainly.com/question/12322912

#SPJ6

Answer: you can't really balance it doesn't make anything

Explanation:

The amount of heat energy produced when 1 g of hydrogen and 2 g of nitrogen are reacted, is -6.61 KJ

First, we shall obtain the limiting reactant. Details below:

3H₂ + N₂ -> 2NH₃

From the balanced equation above,

28 g of N₂ reacted with 6 g of H₂

Therefore,

2 g of N₂ will react with = (2 × 6) / 28 = 0.43 g of H₂

We can see that only 0.43 g of H₂ is needed in the reaction.

Thus, the limiting reactant is N₂

Finally, we the amount of heat energy produced. Details below:

3H₂ + N₂ -> 2NH₃ ΔH = -92.6 KJ

From the balanced equation above,

When 28 grams of N₂ reacted, -92.6 KJ of heat energy were produced.

Therefore,

When 2 grams of N₂ will react to produce = (2 × -92.6) / 28 = -6.61 KJ

Thus the heat energy produced from the reaction is -6.61 KJ

Learn more about heat energy:

https://brainly.com/question/31429264

#SPJ1

One benefit of asexual reproduction is that it is efficient and fast because one organism is involved. ⇒ True

Binary fission is the process of splitting into two identical organisms.⇒ True

The term reproduction is defined as the production of offsprings. There are two types of reproduction. 1. Sexual reproduction 2. Asexual reproduction.

Budding involves a hydra budding an identical right off themselves.⇒ False

Sexual reproduction involves the uniting of gametes. ⇒ True

Sperm and egg cells have 20 chromosomes.⇒ False

One benefit of sexual reproduction is genetic diversity.⇒ True

Genetic variety can exist in a population of grasshoppers due to asexual reproduction.⇒ False

Thus, One benefit of asexual reproduction is that it is efficient and fast because one organism is involved. ⇒ True

To learn more about the reproduction, follow the link;

https://brainly.com/question/14329745

#SPJ1

Answer:

B. the middles of the data sets and the spreads around them should both be considered when comparing data between two different groups.

Answer:

C:RS₂ have the properties of both  R and S.

Explanation:

A compound formed between the two elements R and S to form RS₂ will have properties that reflects both R and S.

This is chemical change and the atoms combine will influence how the the product is formed.

Compounds are substances that are composed of two or more kinds of atoms joined together in a definite grouping.

The given statement "production associates are not allowed to view the process safety management documents. They are only for supervisors and upper management" is true.

These documents are typically intended for supervisors and upper management, as they contain information related to the management of hazards and risks associated with specific processes or operations. This is to ensure that the management team has the necessary information to make informed decisions about process safety and to ensure that appropriate safety measures are in place to protect workers and the surrounding community.

Hence, It is important to note that access to PSM documents should be based on an individual's specific job responsibilities and the level of access needed to perform their duties. Some production associates may have access to certain PSM documents if their job responsibilities require it.

Learn more about production from

https://brainly.com/question/14042777

#SPJ1

See full question below

production associates are not allowed to view the process safety management documents.They are only for supervisors and upper management? true or false.