answer number ! and fill in the unkown

Answer:

3600J

Explanation:

Q = mc∆T

= 50 x 0.9 x (100 - 20)

= 3600J

Answer: A

Explanation:

This means that the atomic number decreases by 1 but the mass remains constant, meaning the atomic number of the new element is 20. This corresponds to calcium.

Answer :]

A.)Calculate the mass of ammonium sulfate that would be obtained by reacting with ammonia acid.

Correct me if i'm wrong :]

Answer: C

Explanation:

In endothermic reactions, enthalpy is positive, and in exothermic reactions, enthalpy is negative, So, if enthalpy is positive, then it is an endothermic reaction, and hence is required for the reaction to occur.

Answer:

Option C

Explanation:

Oxygen molecules form as sugar molecules are broken down.

Sugar or carbohydrates are known as glucose or sucrose and malltose i.e C6H12O6 etc.

So they are broken down by cellular respiration and forms Oxygen for cells

Answer:

Being a covalent compound, the intermolecular forces between the Cl2O molecules are weak and easily overcome. Therefore little heat energy, in terms of low boiling point is involved.

Answer:

Some methods of controlling soil erosion.

1) Planting Vegetation. This method involves planting crops with deep roots that can hold the soil in place. ...

2)Contour Farming. ...

3)Applying Mulches. ...

4)Avoiding Overgrazing. ...

5)Reforestation. ...

6)Use Plastic Sheeting. ...

7)Applying Terraseeding Method

Answer:

A: The bonds of a Molecule

Explanation:

The mass of water in the tank, given the data from the question, is 549594 g

The mole of a substance is related to its mass and molar mass according to the following equation:

Moles =[tex]\frac{mass}{molar \;mass}[/tex]

How to determine the mass of water in the tank

From the question given above, the following data were obtained:

Mole of water = 30533 moles

Molar mass of water = 18 g/mol

Mass of water = ?

The mass of the water can be obtained as follow:

Mass = mole × molar mass

Mass of water = 30533 × 18

Mass of water = 549594 g

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Boyle’s law states that at constant temperature the pressure of a given amount of gas is inversely proportional to the volume of the gas. Hence, option D is correct.

The volume of a gas at a constant temperature varies inversely with the pressure exerted on it.

Boyle's law states " The pressure of a gas is inversely proportional to the volume occupied by the gas when the temperature(in kelvins) is held constant ".

[tex]P[/tex] ∝ [tex]\frac{1}{V}[/tex]

[tex]PV =CONSTANT[/tex]

This means that with an increase in the volume of gas the pressure exerted by the gas decreases or vice versa. Here variables were pressure and volume.

[tex]P[/tex] ∝ [tex]\frac{1}{V}[/tex]

Boyle’s law states that at constant temperature the pressure of a given amount of gas is inversely proportional to the volume of the gas. Hence, option D is correct.

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Answer: The average kinetic energy of the gas particles is greater in container B because it has a higher temperature.

Answer:

.137 moles

Explanation:

need to know the molar mass of water which is 18.01528 g/mol

2.46 g of H₂O divided 18.01528 g/mol molar mass H₂O = moles of H₂O

2.46 divided by 18.01528 =

.137 moles

C4H10 is butane

butane is commonly used in cigarette lighters

2C4H10+1302 -> 8CO2 + 10H₂O is the burning of butane

burning butane with oxygen makes carbon dioxide and water

vsumhcwagovau

There are 4 energy sublevels are present in the principal energy level n = 4.

Sub-level is a type of level that is lower than another level or it is a part or component of a big level. S, p, d and f are the four energy levels in which electrons are present.

So we can conclude that 4 energy sublevels are present in the principal energy level n = 4.

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Answer:

True

Explanation:

had the same question

The element is identified with the number of protons, and the element with 55 protons is Cs.

Since there are 54 electrons, the overall charge is +1, so the answer is [tex]\boxed{\text{Cs}^{+}}[/tex]

The ion symbol for an atom with 55 protons and 54 electrons is [tex]Cs^+[/tex]. In chemistry, a "ion" is a term used to describe an electrically charged particle.

An electrically charged particle is referred to as a "ion" in chemistry. It can be negatively charged (referred to as an anion) or positively charged (referred to as a cation). Ions are created when there is an imbalance between the number of protons and electrons in an atom, which happens when atoms gain or lose electrons. Ions are essential in many chemical processes and are in charge of an electrolytic solution's conductivity. Electric current can flow because in solution, ions are free to travel and carry electrical charges. Ions play an important role in cellular communication and the transport of chemicals through cell membranes in biological systems.

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Answer:

Maybe or maybe not (not sure)

Explanation:

A displacement reaction is a type of reaction where one element is displaced by another from a compound.

In the case of magnesium and lead nitrate, magnesium is more reactive than lead. Therefore, it will displace lead from lead nitrate to form magnesium nitrate and lead.

The reaction can be represented as:

Mg(s) + Pb(NO3)2(aq) → Mg(NO3)2(aq) + Pb(s)


Another answer could be;

A displacement reaction does not take place in 'magnesium + lead nitrate' because magnesium is more reactive than lead.

Answer:

Disturbance; energy.

Explanation:

A wave is a disturbance that transfers energy from one place to another without transferring matter.

Answer:

What types of intermolecular forces are important in controlling bio-molecular structure of proteins?

hydrogen bond

hope it's helpful thanks

Answer:

20 moles HCl

Explanation:

To find the final answer, you need to use the mole-to-mole ratio (from the equation) to convert from moles H₂ to moles HCl. Make sure to arrange the ratios in a way that allows for the units of H₂ to cancel out.

1 H₂ (g) + Cl₂ (g) --> 2 HCl (g)

10 moles H₂          2 moles HCl
-------------------  x  ---------------------   = 20 moles HCl
                               1 mole H₂

After Rounding off The percentage yield is 64%

It is the ratio of actual yield to theoretical yield multiplied by 100% .

It is given in the question

20.0 g of bromic acid, HBrO3, is reacted with excess HBr.

The reaction is

HBrO₃ (aq) + 5 HBr (aq) → 3 H₂O (l) + 3 Br₂ (aq)

Actual yield = 47.3 grams

Molecular weight of Bromic Acid is 128.91 gram

Moles of Bromic Acid = 20/128.91 = 0.155 mole

Mole fraction ratio of Bromic Acid to Bromine is 1 :3

Therefore for 0.155 mole of Bromic Acid 3 * 0.155 = 0.465 mole of Bromine is produced.

1 mole of Bromine = 159.8 grams of Bromine

0.465 of Bromine = 74.31 grams of Bromine

Percentage Yield = (47.3/74.31)*100 = 63.65 %

After Rounding off The percentage yield is 64% .

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They are able to find out more organisms which are present at the bottom of the sea due to their accomplishment.

This information can be used to help the Australian Institute of Marine Biology further to understand the environment of the ocean floor because they are able to see the seas floor and can find out other creatures as well.

So we can conclude that they are able to find out more organisms which are present at the bottom of the sea due to their accomplishment.

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a) In 25 grams of water, the solubility is 92/4 = 23 grams, so adding 24 grams will produce a supersaturated solution.

b) In 50 grams of water, the solubility is 92/2 = 46 grams, so adding 47 grams will produce a supersaturated solution.

c) In 150 grams of water, the solubility is 92(1.5) = 138 grams, so adding 127 grams will produce an unsaturated solution.

A chemical reaction can be reversed if the energy of the products exceeds the activation energy threshold.

Reversible reactions are reactions which can proceed in two directions.

In reversible reactions, reactants can form products and products can also break down to form reactants.

For a chemical reaction to be reversed, the original reaction conditions leading to formation of products are reversed.

Therefore, a chemical reaction can be reversed if the energy of the products exceeds the activation energy threshold.

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A benefit of including comments in your code is that it helps other programmers understand your code.

These are numbers and letters which are used to identify a particular thing at a point in  time.

Comments can be put in a code so as to enable others know and understand real intentions about it etc.

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Answer: O helps other programmers understand your code

Explanation: got it right on edgen

Yes. The model represents atoms rearranging to produce a new compound.

They are reactions involving the breakage of bonds and rearrangement of atoms in reactants to form products.

In the model, the bonds between hydrogen and chlorine were broken. Thereafter, each hydrogen and chlorine molecule linked up to form hydrogen chloride.

Thus, the model shows atoms rearranging to produce a new compound.

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The reaction is spontaneous when TΔS is greater than zero (TΔS>0).

A spontaneous reaction is determined by applying Gib's free energy formula as follows;

ΔG = ΔH - TΔS

A reaction is spontaneous when Gib's free energy is negative.

For the given example, the change in enthalpy is negative (-286 kJ), to obtain a negative Gib's free energy, the entropy must be positive.

Thus, the reaction is spontaneous when TΔS is greater than zero (TΔS>0).

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The length in kilometers of a row of 4.34 x 1023 hydrogen atoms is 4.34 x 10¹⁴ km.

The length of the entire hydrogen atom is calculated as follows;

Length of the row = number x diameter of one

Length of the row = 4.34 x 10²³ x 10⁶ x 10⁻¹²

Length of the row = 4.34 x 10¹⁷ m

Length of the row = 4.34 x 10¹⁴ km

Thus, the length in kilometers of a row of 4.34 x 1023 hydrogen atoms is 4.34 x 10¹⁴ km.

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Answer:

11 moles Al

Explanation:

To find the amount of moles, you need to use Avogadro's number to convert the atoms to moles. Since the value you were given has 2 significant figures, the final answer should also have 2 sig figs.

Avogadro's Number:
6.022 x 10²³ atoms = 1 mole

6.4 x 10²⁴ atoms Al                1 moles
----------------------------  x  ------------------------------  = 10.6 moles Al

                                       6.022 x 10²³ atoms

= 11 moles Al

Answer: 25.1195 L

Explanation:

Given:

There are 0.5860 mol of Iron powder (Fe)

The volume of oxygen gas at STP is 31.5 L

The volume filled by a gas at STP is approximately 22.71 L

Therefore, the moles of oxygen gas at STP = Volume of oxygen gas at STP/ 22.71

= 35.1/22.71

= 1.5456 mol

The balanced chemical equation given for this reaction is:

4Fe(s) + 3O2 (g) ----> 2Fe2O3 (s)

Dividing the above equation by 2, yields:

2Fe(s) + 3/2O2(g) -------> Fe2O3 (s)

From the equation we see:

2 moles of Fe reacts with 3/2 mole of O2 to give one mole of Fe2O3

Thus, let x moles of O2 react with 0.5860 moles of Fe

0.5860/2=x/3/2

0.5860*3=4*x

x = 1.758/4

x =0.4395 mol

So the remaining moles of oxygen gas = 1.5456 - 0.4395

= 1.1061 mol

Therefore, the amount of oxygen gas, in litres, remaining is = 1.1061*22.71

= 25.1195 L