The block of ice shown in pic has each side 8 cm and it has mass of 120
gm, what is the density of a ice block? *
4 gm/cm3
5 gm/cm3
15 g/cm3
960 g/cm3

Answer:

When the sweat hits the air, the air makes it evaporate (this means it turns from a liquid to a vapor). As the sweat evaporates off your skin, you cool down. Sweat is a great cooling system, but if you're sweating a lot on a hot day or after playing hard you could be losing too much water through your skin.

Explanation:

Hope it is helpful....

Matter is anything that has mass and occupies space.

An example of matter is oxygen gas. It is a gas that has a definite volume and can be measured in terms of its mass. Other examples of matter include solids like rocks and metals, liquids like water and oil, and gases like helium and nitrogen. An example of matter is oxygen gas. Matter refers to any substance that has mass and occupies space, and oxygen gas fits this description. In contrast, light and heat are forms of energy, not matter, so they are not suitable examples. In this multiple-choice question, the correct answer would be oxygen gas, as it is a tangible substance with mass and volume, distinguishing it from the other options presented.

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Answer:

-are usually single celled

-do not contain membrane-bound organelles

-have DNA located in cytoplasm

Explanation:

currently taking the test

Answer:

3

Explanation:

begining 0's are never significant

all numbers 1-9 are always significant

ending 0's are only significant when there is

a decimal.

2 mol will be the amount to water produced in this reaction. Option d is the correct answer.

The balanced chemical equation for the reaction between hydrogen and oxygen to form water is, 2H₂ + O₂ -> 2H₂O. From the equation, we can see that 2 moles of hydrogen reacts with 1 mole of oxygen to produce 2 moles of water.

The molar mass of hydrogen is 2 g/mol, and the molar mass of oxygen is 32 g/mol. The number of moles of hydrogen in 10 g of hydrogen is,

n(H₂) = m/M = 10 g / 2 g/mol = 5 mol

The number of moles of oxygen in 64 g of oxygen is,

n(O₂) = m/M = 64 g / 32 g/mol = 2 mol

Since 2 moles of hydrogen react with 1 mole of oxygen to produce 2 moles of water, and we have an excess of oxygen (2 moles), the limiting reactant is hydrogen.

Therefore, the amount of water produced is,

n(H₂O) = 2 mol H₂ x (2 mol H₂O / 2 mol H₂) = 2 mol H₂O

The answer is (d).

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--The complete question is, 10 g of hydrogen and 64 g of oxygen were filled in a steel vessel and exploded. Amount to water produced in this reaction will be:

a. 3 mol

b. 4 mol

c. 1 mol

d. 2 mol--

When a nucleus emits an alpha particle, the mass number of the nucleus decreases, and its atomic number also decreases.

Therefore, the correct answer is: (c). The mass number decreases and its atomic number increases.

The nuclei are incredibly tiny and dense. They are 10 thousand times smaller than an atom and have more than 99.9% of its mass! Protons, which have a positive charge, and neutrons, which have no electrical charge, make up the nucleus.

When a nucleus emits an alpha particle, the mass number of the nucleus decreases, and its atomic number also decreases.

An alpha particle is composed of two protons and two neutrons, which is equivalent to a helium nucleus (He²⁺). When an alpha particle is emitted from a nucleus, the mass number decreases by 4 (as the alpha particle has a mass of 4 atomic mass units) and the atomic number decreases by 2 (since the nucleus loses two protons).

Therefore, the correct answer is:

c. The mass number decreases and its atomic number increases.

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kb = 1.0 x 10^-14 / 6.8 x 10^-4kb = 1.47 x 10^-11MThe value of kb for the fluoride ion, F- is 1.47 x 10^-11M

HF is a weak acid that partially dissociates into H+ and F-.

The value of the acid dissociation constant, ka for HF is 6.8x10^-4. Most of the time, when we talk about acid-base reactions, we focus on the acid and its conjugate base. HF is acid, while F- is its conjugate base, which accepts a proton from HF. Since F- accepts a proton from HF, it is called a base. To find the value of kb for the conjugate base F-, we can use the relationship between ka and kb for a conjugate acid-base pair. Since HF and F- form a conjugate acid-base pair, we can use the equation: ka x kb = Kw, where Kw is the ion product constant of water, which is 1.0 x 10^-14 at 25°C. Rearranging this equation gives kb = Kw / ka.

Therefore, kb = 1.0 x 10^-14 / 6.8 x 10^-4kb = 1.47 x 10^-11MThe value of kb for the fluoride ion, F- is 1.47 x 10^-11M.

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The Passengers the Balogna could carry if it were filled with hydrogen, and also if it were filled with helium are

\(\begin{tabular}{|l|l|} Passengers with $\quad \mathrm{H}_2:$ & 1007 \\ Passengers with $\mathrm{He}:$ & 928 \\\end{tabular}\)

(h) length of cylinder =100M

(r) radius of cylinder =15M

the volume of a cylinder: \($\pi r^2 \mathrm{~h}=\frac{22}{7} \times(15 \mathrm{~m})^2 \times 100 \mathrm{~m}$$=70714.3 \mathrm{~m}^3$\)

mass of air displaced

\(\begin{aligned}& =1.23 \mathrm{~kg} / \mathrm{m}^3 \times 70714.3 \mathrm{~m}^3 \\& =86978.57 \mathrm{Kg}\end{aligned}\)

when gas is H_2:

Let us assume a number of passengers =x

then, \($x \times 80 \mathrm{Kg}+70714.3 \mathrm{~m}^3 \times 0.090 \frac{\mathrm{kg}}{\mathrm{m}^3}=86978.57 \mathrm{~kg}$\)

x=1007.68 or 1007 people

when gas is{He}_e

then \($\quad x \times 80 \mathrm{~kg}+70714.3 \mathrm{~m}^3 \times 0.18 \frac{\mathrm{kg}}{\mathrm{m}^3}=86978.57 \mathrm{~kg}$\)

x=928.125 or 928 people

ANSWER:

\(\begin{tabular}{|l|l|} Passengers with $\quad \mathrm{H}_2:$ & 1007 \\ Passengers with $\mathrm{He}:$ & 928 \\\end{tabular}\)

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Answer:

Ok, in number 1 you have to write down the characteristics of light listed there in the Venn diagram, and place them in each column.

In number 2, you have to color in the boxes for with the corresponding color. For example, in box R, you would color red, and so on. Then, you have to color the wave of light following your chart on top of it.

In number 3 you have to color the apple red, and color the sun yellow and draw a yellow ray from the sun hitting the apple and then changing into red and bouncing into the eye.

Explanation:

I hope this helps.

Please give Brainly.

Ok I gave you the answer to question 2 and 3, the answer to question 1 is:

cannot be seen is ultraviolet light, can be seen is visible light, higher energy is ultraviolet light, lower energy is visible light, from of electromagnetic energy is both, emitted from the sun is ultraviolet light. :)

Answer: energy is transferred through vibration of air particles or particles of a solid through which the sound travels.

Answer:

Sound is transmitted by vibrating a object and the waves move through particles.

Explanation:

Answer:

the number of moles of the gas is 0.00174 mol.

Explanation:

Given;

temperature of the, T = 300 K

volume of the gas, V = 1.45 L

Pressure of the gas, P = 3.0 kPa

The number of moles of the gas is calculated using Ideal gas equation, as follows;

PV = nRT

Where;

n is number of moles of the gas

R is the ideal gas constant, = 8.315 L.kPa/mol.K

n = PV / RT

n = (3 x 1.45) / (8.315 x 300)

n = 0.00174 mol.

Therefore, the number of moles of the gas is 0.00174 mol.

The Equation of reaction

C + O2 === CO2

First Blank spot would be

---- 3.5moles of O2

2nd spot

Up.... 1mole of CO2

Down ---- 2moles of Oxygen atoms

3rd spot

Up... --- 22.4L of CO2(1mole of any gas at STP contains 22.4L)

Down---- 1mole of CO2

Final answer --- 3.5 x 1/2 x 22.4

=39.2L of CO2

KOH(aq) + H3PO4(ag) → K3PO4(ag) + H₂O

the coefficient of the phosphoric acid from the above equation was 1

Explain about phosphoric acid ?

Phosphoric acid (orthophosphoric acid, monophosphoric acid, or phosphoric(V) acid) is a colourless, odorless phosphorus-containing solid and inorganic substance having the chemical formula H3PO4. It is most usually seen as an 85% aqueous solution, which is a colourless, odourless, non-volatile syrupy liquid. It is an important industrial chemical that is found in many fertilisers.

The compound is an acid. The phosphate ion PO 34 is formed when all three H+ ions are removed. The removal of one or two protons yields the dihydrogen phosphate ion H2PO - 4 and the hydrogen phosphate ion HPO 2 4, respectively. Phosphoric acid creates esters known as organophosphates.

The term "orthophosphoric acid" can be used to distinguish this acid from other "phosphoric acids," such as pyrophosphoric acid. Nonetheless, the word "phosphoric acid" refers to this particular molecule.

the balanced equation was

3 KOH(aq) + H₂PO4(ag) → K3PO4(ag) + 3 H₂O(1)

so the coeffecient of the phosphoric acid was 1

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Option 2) Bromoethane and methanol is correct

The major products obtained upon treatment of ethyl methyl ether with excess HBr are Bromoethane and methanol.

What is ethyl methyl ether?

Ethyl methyl ether is a colorless gas that is used as a solvent. The IUPAC name for this compound is methoxyethane. It is a member of the ether family of compounds. When ethyl methyl ether reacts with excess HBr, it undergoes a substitution reaction and forms Bromoethane and methanol. The mechanism for this reaction is given below: Methoxyethane reacts with hydrogen bromide to produce methanol and ethyl bromide (bromoethane). Here are the products that are formed in this reaction: Bromoethane (C2H5Br) and Methanol (CH3OH)

The chemical equation for this reaction can be written as: CH3OCH2CH3 + HBr → CH3OH + CH3CH2Br \(\boxed{Option\ 2)}\)

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There are multiple ways to prevent these situations from occurring. The three most common protective devices are fuses, circuit breakers, and surge protectors

Explanation:

Some neurotoxins work essentially the same way as some local anesthetics, which is to block the transmission of nerve impulses.

Some neurotoxins work essentially the same way as some local anesthetics, which is to block the transmission of nerve impulses.

This means that they prevent the nerves from sending signals to the brain, which can result in a loss of sensation or paralysis.

Neurotoxins are substances that are toxic to the nervous system and can cause damage to the nerves or interfere with their function.

Local anesthetics, on the other hand, are drugs that are used to temporarily numb a specific area of the body during medical procedures.

Both neurotoxins and local anesthetics work by blocking the transmission of nerve impulses. They do this by binding to the sodium channels on the nerve cells, which prevents the flow of sodium ions and stops the nerve impulses from being transmitted. This can result in a loss of sensation or paralysis, depending on the specific neurotoxin or anesthetic used.

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Answer:

yes

Explanation:

Answer:

These people were ranked best at chemistry

Explanation:

Answer:

B. 75.0 kPa

Explanation:

P1V1/T1=P2V2/T2

(x * 100 L)/(300 K)=(100 kPa * 50.0 L)/(200 K)

x=75.0 kPa

Answer:

24rq3r54

Explanation:

3t5q6tq6tq

Answer:

D

Explanation:

Answer:

Polymerization, any process in which relatively small molecules, called monomers, combine chemically to produce a very large chain-like or network molecule, called a polymer. The monomer molecules may be all alike, or they may represent two, three, or more different compounds.

Explanation:

:^)

The substance that is NOT in its standard state among the options provided is e. H (hydrogen).

Among the given options, hydrogen (H) is the substance that is not in its standard state, as it typically exists as a diatomic molecule (H₂) rather than as individual hydrogen atoms.

In its standard state, hydrogen exists as a diatomic molecule, H₂. However, the option e. H suggests that hydrogen is not in its standard state and likely refers to atomic hydrogen (H), which exists as a highly reactive and unstable species. In its standard state, hydrogen is found as H₂, not as individual hydrogen atoms.

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Complete Question:

Identify a substance that is NOT in its standard state

a. Ca

b. H₂

c. Li

d. Ne

e. H

Answer:

A. The largest value is 7 and the smallest value is 1. Find the difference. 7 - 1 = 6.

Explanation:

Answer:

an atom with 3 protons and 4 neutrons is a lithium atom

The pH of a buffer solution that is 0.15 M chloroacetic acid (C2H3ClO2) and 0.10 M sodium

chloroacetate is 2.7.

Buffer Solution is defined as a water solvent based solution that is mostly consists of a mixture having weak acid and conjugate base of the weak acid, or in other word solution of a weak base and conjugate acid of the weak base.

The buffer solution always acidic or basic.

[H+] = Ka × [weak acid] / [salt] × valancy

[salt] = 0.10M

[weak acid] = 0.15M

Ka = 1.3 x 10-3

[H+] = 1.3 x 10-3 × 0.15/ 0.10

= 0.00195M

Now, as we know that

pH = -log[H+]

= -log(0.00195M)

= 2.7

Thus, we concluded that the pH of a buffer solution that is 0.15 M chloroacetic acid (C2H3ClO2) and 0.10 M sodium

chloroacetate is 2.7.

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Answer:c

Explanation:

Answer:

I got B a little while back, but the answer might be different for you

sorry if i am wrong

Explanation:

The chemical equation which is not properly classified is CO₂ +  2 H₂O\(\rightarrow\) CH₄ + 2 O₂ as this is not combustion reaction.

Chemical equation is a symbolic representation of a chemical reaction which is written in the form of symbols and chemical formulas.The reactants are present on the left hand side while the products are present on the right hand side.

A plus sign is present between reactants and products if they are more than one in any case and an arrow is present pointing towards the product side which indicates the direction of the reaction .There are coefficients present next to the chemical symbols and formulas .

The first chemical equation was put forth by Jean Beguin in 1615.By making use of chemical equations the direction of reaction ,state of reactants and products can be stated. In the chemical equations even the temperature to be maintained and catalyst can be mentioned.

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Precipitation would decrease salinity by decreasing the amount of dissolved material in the ocean.

Precipitation would decrease salinity by decreasing the amount of dissolved material in the ocean. When it rains, freshwater from the atmosphere mixes with the saltwater in the ocean, diluting the concentration of salt in the water. This can lead to a decrease in the overall salinity of the ocean.

Evaporation would have the opposite effect, as it removes water from the ocean and leaves behind a higher concentration of dissolved salts. Sea spray and a large volcanic eruption could also potentially impact the salinity of the ocean, but the overall effect would depend on the specific details of the event.

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Complete Question :

Which of the following would decrease salinity by decreasing the amount of dissolved material in the ocean?

A. evaporation

B. a large volcanic eruption

C. sea spray

D. precipitation

If 150cm³ of carbon(11) oxide burns in 80cm³of oxygen according to the given equation the volume of oxygen that was in excess is 5.6 cm³.

From the balanced equation, we can see that 2 moles of CO react with 1 mole of O2. Therefore, we need to determine how much O2 is required to react with 150 cm³ of CO.

Let's start by calculating the number of moles of CO:

n(CO) = V(CO) / molar volume at STP

= 150 cm³ / 22.4 L/mol

= 0.006696 mol

Since the stoichiometric ratio of equation of CO to O2 is 2:1, we need half as many moles of O2 as CO. Therefore, the number of moles of O2 required is:

n(O2) = 1/2 * n(CO)

= 1/2 * 0.006696 mol

= 0.003348 mol

Now we can calculate the volume of oxygen required using the ideal gas law:

PV = nRT

Assuming the temperature and pressure are constant, we can simplify this to:

V = n(RT/P)

where V is the volume of gas in liters, n is the number of moles of gas, R is the ideal gas constant, T is the temperature in Kelvin, and P is the pressure in atmospheres.

At STP, the temperature is 273 K and the pressure is 1 atm. Therefore:

V(O2) = n(O2)(RT/P)

= 0.003348 mol * (0.0821 L·atm/mol·K * 273 K / 1 atm)

= 0.0744 L

= 74.4 cm³

So the volume of oxygen required to react with 150 cm³ of CO is 74.4 cm³. Since the initial volume of O2 was 80 cm³, the volume of O2 in excess is:

V(excess) = V(initial) - V(required)

= 80 cm³ - 74.4 cm³

= 5.6 cm³

Therefore, the volume of oxygen that was in excess is 5.6 cm³.

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The electron-bearing carbon atom in both methylene (-CH2-) and ethyl (-C2H5) structures has a formal charge of zero.

The formal charge is a method used to predict the electron distribution in atoms of a molecule, which can be calculated by subtracting the number of valence electrons of the free atom from the number of electrons assigned to the atom in the Lewis structure.In the case of methylene, which is a fragment of a hydrocarbon with the chemical formula -CH2- has 2 valence electrons, it shares one electron with each of the two hydrogen atoms, so the carbon atom has a formal charge of zero. In the case of ethyl, which is a fragment of a hydrocarbon with the chemical formula -C2H5, it has 5 valence electrons, it shares one electron with each of the five hydrogen atoms, so the carbon atom has a formal charge of zero.The electron-bearing carbon atoms in both methylene and ethyl have a formal charge of zero because they have a complete octet of valence electrons, which indicates a stable electronic configuration.

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