Steam is collected and observed to condense into liquid water. Which of the following would you expect to observe if a thermometer recorded the temperature of the substance?

SELECT AN ANSWER

The temperature would decrease.


The temperature would remain the same.


It would depend on the amount of steam.


The temperature would increase.

Answer: 190.9K

Explanation:

5.6(14) = 5(.0821)T  or  (5.6*14)/(5(.0821))

78.4 = 0.4105T

190.9K = T

Answer:

pump that is the answer hope its right

Answer:

Volume = 19.68 ml

Explanation:

The equation of the reaction is given as;

HNO3 + KOH ---> KNO3 + H2O

1 mol of HNO3 reacts 1 mol of KOH

Converting 0.276 g of KOH to mol;

Number of moles = Mass / Molar mass

Number of moles = 0.276g / 56.1056 g/mol

Number of moles = 0.00492

Since the mole relationship is 1 = 1;

This means 0.00492 mol of HNO3 reacts with 0.00492 mol of KOH

The relationship between molarity and volume id given as;

Molarity = Number of moles / Volume

Volume = Number of moles / Molarity = 0.00492 mol / 0.250 M

Volume = 0.01968 L

Volume = 19.68 ml

Answer:

The electricity that flows to our homes is generated in the power station from here it flows through large transmission line which carry it to substations finally distribution carry electricity from substations to homes schools etc

Explanation:

number of moles =mass /relative molecular mass

n=10g/mr(FeSO4)

N=10/(56+32+16×4)

N=10/152

N=0,066 moles

Answer:

7.08

Explanation:

To solve this problem we'll use the Henderson-Hasselbach equation:

Where [tex]\frac{[A^-]}{[HA]}[/tex] is the ratio of [sodium formate]/[formic acid] and pka is equal to -log(Ka), meaning that:

We input the data:

And solve for [tex]\frac{[A^-]}{[HA]}[/tex]:

The ratio of [sodium formate] to [formic acid] needed to make the buffer is 7.08

pKa = –Log Ka

pKa = –Log 1.8×10¯⁴

pKa = 3.74

pH = pKa + Log[sodium formate]/[formic acid]

4.59 = 3.74 + Log[sodium formate]/[formic acid]

Collect like terms

4.59 – 3.74 = Log[sodium formate]/[formic acid]

0.85 = Log[sodium formate]/[formic acid]

Take the anti-log of 0.85

[sodium formate]/[formic acid] = anti-log 0.85

[sodium formate]/[formic acid] = 7.08

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Answer:

I think beaker three will take longer to boil since there is more water present,compared to the other beakers

Answer: Light, Chemical

Explanation: This is the answer because "photosynthesis takes place in two stages: the light-dependent reactions and the Calvin cycle. In the light-dependent reactions, which take place at the thylakoid membrane, chlorophyll absorbs energy from sunlight and then converts it into chemical energy with the use of water." - source https://opentextbc.ca/

In the photosynthesis the energy starts as Light energy and ends up as Chemical Energy. Hence option (D) is correct

The process by that inexperienced plants and a few different organisms use daylight to synthesize nutrients from carbonic acid gas and water. chemical action in plants usually involves the inexperienced pigment and generates element as a by-product.

Photosynthesis may be a method employed by plants and different organisms to convert lightweight energy into energy that, through internal respiration, will later be discharged to fuel the organism's activities.

photosynthesis takes place in 2 stages: the light-dependent reactions and also the Calvin cycle. within the light-dependent reactions, that manifest itself at the thylakoid membrane, pigment absorbs energy from daylight and so converts it into energy with the employment of water.

Therefore, In the photosynthesis the energy starts as Light energy and ends up as Chemical Energy. Hence option (D) is correct

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Answer:

23.6 moles

Explanation:

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

Mass of air = 3.6 Kg

Mass percentage of O₂ = 21%

Number of mole of O₂ =?

Next, we shall convert 3.6 Kg of air to grams (g). This can be obtained as follow:

1 kg = 1000 g

Therefore,

3.6 Kg = 3.6 Kg × 1000 / 1 kg

3.6 Kg = 3600 g

Next, we shall determine the mass of O₂ in the air. This can be obtained as follow:

Mass of air = 3600 g

Mass percentage of O₂ = 21%

Mass of O₂ =?

Mass of O₂ = 21% × 3600

Mass of O₂ = 21/100 × 3600

Mass of O₂ = 756 g

Finally, we shall determine the number of mole of O₂ in the sample of air. This can be obtained as follow:

Mass of O₂ = 756 g

Molar mass of O₂ = 2 × 16 = 32 g/mol

Number of mole of O₂ =?

Mole = mass /Molar mass

Number of mole of O₂ = 756 / 32

Number of mole of O₂ = 23.6 moles

Thus, the number of mole of O₂ in the

sample of air is 23.6 moles

Answer:

2.place value is 70 000 00

The question is incomplete, the complete question is;

Calculate the volume of concentrated HCL (12 M) needed to convert 1.5 g of sodium benzoate back to benzoic acid.

Answer:

8.33 * 10^-4 L

Explanation:

Equation of the reaction;

C6H5COONa + HCl -------->>>> C6H5COOH + NaCl

Number of moles of  sodium benzoate = mass/molar mass

molar mass of sodium benzoate =144.11 g/mol

mass of sodium benzoate = 1.5 g

Number of moles of  sodium benzoate = 1.5g/144.11 g/mol

Number of moles of  sodium benzoate = 0.01 moles

Since the reaction is 1:1,  0.01 moles of HCl reacted.

but;

n = CV

n = number of moles

C = concentration

V = volume

V = n/C

V =  0.01 moles/12 M

V = 8.33 * 10^-4 L

The type of solutions which are appearing cloudy are called colloids. Therefore, option a is correct.

Colloids are mixtures in which particles of one substance are evenly dispersed throughout another substance, creating a stable mixture. The particles in a colloid are larger than those found in a solution, but smaller than those found in a suspension.

Colloids can be found in various states of matter, including solid, liquid, and gas, and they can be formed from a wide range of substances, such as polymers, metals, and biological molecules.

One important characteristic of colloids is their ability to scatter light. This phenomenon, known as the Tyndall effect, occurs when light passes through a colloid and is reflected by the particles, causing the mixture to appear cloudy or hazy.

Colloids also exhibit unique properties related to their size and shape, such as viscosity, surface tension, and Brownian motion. They appear cloudy in nature.

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Answer:Through Direct or indirect contact with an infected person or animal, through air or contaminated food and water.

Explanation:

Answer: 0.0450 moles of [tex]CaCl_2[/tex]

Explanation:

According to avogadro's law, 1 mole of every substance weighs equal to its molecular mass and contains avogadro's number [tex]6.023\times 10^{23}[/tex] of particles.

To calculate the moles, we use the equation:

[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text {Molar mass}}[/tex]

[tex]\text{Number of moles of} CaCl_2=\frac{5.00g}{110.98g/mol}=0.0450moles[/tex]

Thus there are 0.0450 moles of [tex]CaCl_2[/tex]

Answer:

The basic building blocks that make up matter are called atoms.

I hope it's helpful!

Answer:

96.09 g/mol

Explanation:

Answer:

0.1529mol

Explanation:

Number of mole = x mol

Mass = 52.3g

Molar Mass of Sucrose

(C = 12, H = 1, O = 16)

C12H22O11

(12×12)+(1×22)+(16×11)

144 + 22 + 176

342g/mol

Number of Mole = Mass given/Molar mass

Number of mole = 52.3/342

Number of mole = 0.1529mol

Answer: A chemical compound can be described as substance composed of atoms from more than one element held together by chemical bonds in a fixed stoichiometric proportion. A compound has different physical and chemical properties from its constituent elements.

For example : compound water is made up of H and O bonded together and it has different properties from O and H.

Thus, among the given options, the one coreectly describing a compound is

a) The atoms are bonded together, and the compound has different physical and chemical properties than the individual elements.

Answer:

table A

Explanation:

its table A because it requires less force push. the less force used the less friction there is.

the less friction there is the more smooth a surface is.

Answer:

See explanation

Explanation:

Rf value is known as retention factor.The retention factor of a particular material is the ratio of the distance the spot moved above the origin to the distance the solvent front moved above the origin(Harper College).

TLC is carried is out in a closed container and the interior is saturated with the solvent vapor in order to have a maximum resolution between components this prevents solvent from evaporating from the system.

Peradventure the solvent for the separation is partly or wholly  lost due to an open container, the Rf value would be lower than the expected value.

Answer:

Crest is the highest point of a wave

Answer:

It released hydroxide ions (OH ¯).

Explanation:

A PH of 8.3 indicates that the solution has become a basic solution.

Now, for us to have a basic solution from the addition of an alka-seltzer to Koolaid, it means the Alka-seltzer released plenty of hydroxide ons (OH¯) to the solution.

Answer: [tex]K_a[/tex] for the acid is [tex]3.34\times 10^{-4}[/tex]

Explanation:

[tex]HC_9H_7O_4\rightarrow H^+C_9H_7O_4^-[/tex]

 cM              0             0

[tex]c-c\alpha[/tex]        [tex]c\alpha[/tex]          [tex]c\alpha[/tex]  

Give c = 0.328 M and [tex]pH=1.987[/tex]

[tex]1.987=-log[H^+][/tex]

[tex][H^+]=0.0103[/tex]

[tex][H^+]=c\times \alpha[/tex]

[tex]0.0103=0.328\times \alpha[/tex]

[tex]\alpha=0.0314[/tex]

So dissociation constant will be:

[tex]K_a=\frac{(c\alpha)^{2}}{c-c\alpha}[/tex]

Putting in the values we get:

[tex]K_a=\frac{(0.328\times 0.0314)^2}{(0.328-0.328\times 0.0314)}[/tex]

[tex]K_a=3.34\times 10^{-4}[/tex]

Answer: hope this helps

Explanation: I’m not sure but after some research here’s what I gathered The molecule has 3 calcium atoms, 2 phosphate atoms and 8 O atoms in it also rate this and pls thank me follow and as as many questions as you need.

Answer: 90.04°C

Explanation: Calorimeter is a device measures the amount of heat of a chemical or physical process. An ideal calorimeter is one that is well-insulated, i.e., prevent the transfer  of heat between the calorimeter and its surroundings. So, the net heat change inside the calorimeter is zero:

[tex]q_{1}+q_{2}=0[/tex]

Rearraging, it can be written as

[tex]q_{1}=-q_{2}[/tex]

showing that the heat gained by Substance 1 is equal to the energy lost by Substance 2.

In our case, water is gaining heat, because its temperature has risen and so, brass is losing energy:

[tex]q_{water}=-q_{brass}[/tex]

Calculating:

[tex]m_{w}.c_{w}.\Delta T=-[m_{b}.c_{b}.\Delta T][/tex]

[tex]100.4.18.(18.4-15)=-[52.9.0.375.(18.4-T)][/tex]

Note: final temperature is the same as the substances are in thermal equilibrium.

Solving:

418(3.4)= - 365.01 + 19.8375T

19.8375T = 1786.21

T = 90.04

The initial temperature for the sample of brass was 90.04°.

Answer:

2Fe + 6HC2H3O2 → 2Fe(C2H3O2)3 + 3H2

Explanation:

There you go

A mixture of water and non-dissolved materials is called a heterogeneous mixture.

A heterogeneous mixture is a mixture that contains two or more substances that are not uniformly distributed throughout the mixture.

In a mixture of water and non-dissolved materials, the non-dissolved materials are not uniformly distributed throughout the water. Instead, they will settle to the bottom of the container over time.

Therefore, heterogeneous mixture is a mixture of water and non-dissolved materials.

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Answer:

Classifications according to mandatory, discretionary, or originator controlled policy, or a combination thereof:

a. Mandatory

b. Originator

c. Discretionary

d. Mandatory and Originator combined

Explanation:

a) Mandatory control means that access to the UNIX operating system is restricted.

b) Originator controlled policy implies that the memorandum cannot be distributed without the author's consent or permission.

c) Discretionary means that only certain authorized users, for example, generals, can access the particular room.

d) Combined Mandatory and Originator means that while access is restricted to some people, the originator's consent is still required before access can be granted to the faculty member.

Answer:

0.01 M

Explanation:

NaOH (sodium hydroxide) is a strong base, so it is completely dissociated into ions in aqueous solution:

NaOH ⇄ Na⁺ + OH⁻

So, we have OH⁻ ions in solution.

From the problem, we have the pH value. The pH is calculated as:

pH = -log [H⁺]

As NaOH is a base, we can also calculate the pOH:

pOH = -log [OH⁻]

Thus. we can use the relation between pH and pOH to calculate the pOH and then use it to calculate [OH⁻]:

pH + pOH = 14 ⇒ pOH = 14 - pH = 14 - 12.05 = 1.95

pOH = -log [OH⁻] ⇒ [OH⁻] = [tex]10^{-pOH}[/tex]= [tex]10^{1.95}[/tex]= 0.0112 M ≅ 0.01 M

Answer:

0.0112

Explanation:

They said that was the answer.