CHEM help
i know how to report random answers btw

Answer:

I would tell him to open the tent in order to breathe frsh air.

Explanation:

Even if propane is not ignited, the buildup of the gas can be deadly due to inhalation. Breathing the gas can cause hypoxia, which is a form of oxygen deprivation that can lead to death. Hence you shouldnt use propane indoors.

Answer:

covalent is the bonding that occurs in H2O  

Explanation:

Answer:

1. 1.56 M

2. Water →  0.803

Ethanol → 0.197

3. - 8.07°C

Explanation:

1. To solve this problem, we need benzene's density in order to determine the volume.

We assume the volume of solvent, as the volume of solution

Density for benzene is 0.8786 g/mL.

Density = m/V → V = m/density

Volume = 217 g /0.8786 g/mL = 247 mL

We convert the mass to moles and then, to mmoles

49.3 g . 1mol / 128g . 1000mmol / mol = 385.1 mmol

M = 385.1 mmol / 247mL = 1.56 M

2. We determine moles of each, solute and solvent

94.2 g. 1mol /18g = 5.23 moles of water

58.7 g . 1mol /46g = 1.28 moles of ethanol.

Total moles = 5.23 + 1.28 = 6.51

Mole fraction of water = Moles of water / Total moles

Mole fraction of ethanol = Moles of ethanol / Total moles

Water → 5.23 / 6.51 = 0.803

Ethanol →  1.28 / 6.51 = 0.197

3. Freezing point depression → ΔT = Kf . m . i

i = Van't Hoff factor, ions that are present in the solution.

As the solute is organic, i = 1.

Kf = 1.86 °C/m

m = molality (moles of solute in 1kg of solvent)

2.17 mol / 0.5kg = 4.34 m

ΔT = Freezing T° of pure solvent - Freezing T° of solution.

We replace data → 0° - Freezing T° of solution = 4.34m . 1.86°c/m . 1

Freezing T° of solution = - 8.07°C

Answer:

A chemical reaction is a process in which one or more substances, also called reactants, are converted to one or more different substances, known as products. ... A chemical reaction rearranges the constituent atoms of the reactants to create different substances as products.

Answer:

The correct answer is B. From the chemical reaction, the reactants are carbon dioxide and water. Reactants are the substances that take part in the chemical reaction which, as a result, produces new substances called the products

Explanation:

Hope it helps

Answer:

The answer of this question is 3

Answer:

Reduction

Explanation:

Oxidation is a process that involves loss of electrons.

Reduction is a process that involves gain of electrons.

In this equation, the electrons (4e-) are in the reactant side. This means that it is gain of electrons.

The reaction is a reduction reaction.

molecule, cell, tissue, organ, organ system, organism, population, community, ecosystem, biosphere.

Answer:

c

Explanation:

Answer:

d

Explanation:

Answer:

Explanation:.the device controlled the activation as shown by the water holding room temperature for 15 seconds until activation by crushing the pills. The temperature rose 30° over two minutes, showing a measurable exothermic reaction from the Calcium Chloride dissolving in the water. Pour 5mL water in a quart bag Place Thermometer in the bag to make contact Fill two gelatin 000 capsules with 1 gram of Calcium Chloride Place capsules into the bag Wait 15 seconds to crush the capsules while they are submerged in the water Temperatures - 0 Seconds 75° 15 Seconds - Activation 75° 30 Seconds 85° 60 Seconds 95° 90 Seconds 104° 120 Seconds 105° Test #2 For this trial, the variables of the water Calcium Chloride will be increased by the factor of one.

Answer:

a. The limiting reactant is Ca(OH)₂

b. The theoretical yield of CaCl₂ is approximately 621.488 grams

c. The percentage yield of CaCl₂ is approximately 47.06%

Explanation:

a. The given chemical reaction is presented as follows;

Ca(OH)₂ + 2HCl → CaCl₂ + 2H₂O

Therefore;

One mole of Ca(OH)₂ reacts with two moles of HCl to produce one mole of CaCl₂ and two moles of water H₂O

The mass of HCl in an experiment, m₁ = 229.70 g

The mass of Ca(OH)₂ in an experiment, m₂ = 207.48 g

The molar mass of HCl, MM₁ = 36.458 g/mol

The molar mass of Ca(OH)₂, MM₂ =74.093 g/mol

The number of moles of HCl, present, n₁ = m₁/MM₁

∴ n₁ = m₁/MM₁ = 229.70 g/(36.458 g/mol) ≈ 6.3 moles

The number of moles of Ca(OH)₂, present, n₂ = m₂/MM₂

∴ n₂ = m₂/MM₂ = 207.48 g/(74.093 g/mol) ≈ 2.8 moles

The number of moles of Ca(OH)₂, present, n₂ = 2.8 moles

According the chemical reaction equation the number of moles of HCl the 2.8 moles of Ca(OH)₂ will react with, = 2.8 × 2 moles = 5.6 moles of HCl

Therefore, there is an excess HCl in the reaction and Ca(OH)₂ is the limiting reactant

b. According the chemical reaction equation the number of moles of CaCl₂ produced in he reaction by the 2.8 moles of Ca(OH)₂ = 2.8 × 2 moles = 5.6 moles of CaCl₂

The molar mass of CaCl₂ = 110.98 g/mol

The mass of the 5.6 moles of CaCl₂ = 5.6 moles × 110.98 g/mol ≈ 621.488 grams

The theoretical yield of CaCl₂ ≈ 621.488 grams

c. Given that the actual mass of CaCl₂ produced = 292.5 grams, we have;

The percentage yield of CaCl₂ = The actual yield/(The theoretical yield) × 100

∴ The percentage yield of CaCl₂ = (292.5 g)/(621.488 g) × 100 ≈ 47.0644646397%

The percentage yield of CaCl₂ ≈ 47.06%.

Answer:

Is this a general question or is there supposed to be a picture

Explanation:

but its c because it dealing with power

Explanation:

Answer:

cupro - nickel

if u on its weight its 9.00gms and diameter:23mm

Answer:

Silver

Explanation:

Because when white metal has an illustrious reputation for its use on jewelry and coins, but today, silvers primary use is industrial.

Answer:

strength and vitality required for sustained physical or mental activity

Explanation:

Answer:

energy is the quantitative property that must be transferred to an object in order to perform work on, or to heat, the object.

Answer:

V = 39.38 L

Explanation:

Given that,

No. of moles of H₂, n = 2

Temperature, T = 300 K

Pressure, P = 1.25 atm

We need to find the volume occupied by the gas. We can use the ideal gas law to find it such that,

[tex]PV=nRT[/tex]

Where

R is gas constant, R = 0.08205 L-atm/mol-K

V is volume of the gas

Rearranging the above formula for V. So,

[tex]V=\dfrac{nRT}{P}\\\\V=\dfrac{2\times 0.08205\times 300}{1.25}\\\\V=39.38\ L[/tex]

So, the volume occupied by the gas is 39.38 L.

The volume occupied by this hydrogen gas is equal to 39.408 Liters.

Given the following data:

To determine the volume occupied by this hydrogen gas, we would use the ideal gas law equation;

[tex]V= \frac{nRT}{P}[/tex]

Where;

Substituting the given parameters into the formula, we have;

[tex]V=\frac{2 \times 0.0821 \times 300 }{1.25} \\\\V=\frac{49.26}{1.25}[/tex]

Volume, V = 39.408 Liters.

Read more: https://brainly.com/question/15677704

Answer:

a. more than the earth pull on the moon sorry if false

Answer:

Nuclear decay is also called radioactive decay, and it occurs in a series of sequential reactions until a stable nucleus is reached. Nuclear reactions release much more energy—orders of magnitude more—than exothermic chemical reactions.

Explanation:

Answer:

30 g

Explanation:

In order to convert from moles of CH₃COOH to grams, we need to use its molar mass:

Now we convert moles into grams:

So 0.5 moles of CH₃COOH have a mass of 30 grams.

answer:

explanation:

Answer:

CaCl2 + 2AgNO3 = Ca(NO3)2 + 2AgCl

Explanation:

Calcium chloride reacts with silver nitrate to produce calcium nitrate and silver(1) chloride

Answer:

A monoprotic acid has only one equivalence point in a titration curve while a triprotic acid has three equivalence points.

Explanation:

Monoprotic acids, HA, are acids that are able to donate one proton per molecule during the process of ionization or dissociation as shown below:

HA ----> H⁺ + A⁻

A triprotic acid is a polyproprotic acid, that is acids that can donate more than one proton per molecule during ionization. a triprotic acid can donate three protons per molecule during the process of ionization. The dissociation of a triprotic acid is shown below;

H₃A -----> H₂A⁻ + H⁺

H₂A⁻ ----> HA²⁻ + H⁺

HA²⁻ -----> A³⁻ + H⁺

The value Ka, is known as the acid dissociation constant. It is found by looking at the equilibrium constant for the dissociation of the acid. The higher the Ka, the more the acid dissociates

A titration curve is the plot of the pH of the analyte solution versus the volume of the titrant added as the titration progresses.

In a titration curve in which base is added to acid, the pH rises slowly until the equivalent point at which point the pH remains constant before it begins to rise again on the addition of more base.

In a titration curve of a monoprotic acid, there is only one region in which the equivalence point is obtained corresponding to the point of acid of dissociation of all its protons.

In the titration curve of a triproprotic acid, three equivalent points are obtained corresponding to the point of dissociation of each of three protons of the triprotic acid.

The titration curves are shown below

Answer:

189.6 mL

Explanation:

As per Boyles law when a gas is kept at a constant temperature and mass in a closed container, the volume and pressure vary inversely.

P1V1= P2V2

Here, P1 = 0.79 atm, V1 = 240 ml, P2= 1 atm

therefore, substituting values in above equation we get

0.79×240 = 1×V2

⇒V2 = 189.6 ml

therefore,  its volume at STP (1 atm and 0 oC) = 189.6 ml

Answer:

The answer is 0.073

Explanation:

Final step: 0.73 x 10^-1

Explanation:

Soap solution is called a mixture because you're combining a ratio of liquid soap and water to make a mixture.

Answer:

Dirt

mud

rocks

ect.

Explanation:

Answer:

The molecules tend to speed up and move faster throughout the substance once thermal energy increases. This is evident whenever we heat up water as its molecules tend to move faster throughout the water as thermal energy tends to increase

Hope this helps!