A marble has a density of 11 g/cm3 and when dropped in a graduated cylinder increases the water level from 2 mL to 4 mL of volume. What is the mass of the marble in grams?

Answer:

73.05g

Explanation:

1.25 mol NaCl * \(\frac{58.44g}{1 mol NaCl}\) = 73.05g

58.44g = molar mass of NaCl

Answer:

Explanation:

u are right

Answer:

An icicle

Explanation:

An icicle is heavier and has more mass making it fall quicker then a smaller and lighter item like a snow flake.

To read the measuring cylinder we first count the number of smaller divisions between the marked interval. In this case it is 10 intervals. The marked intervals are 60 and 80, therefore between these values we have 20. We will now divide the 20 by the 10 intervalswhich is equal to 2. Now each interval has a numerical value of 2. We read from the bottom of the meniscus. The meniscus is ttouching the 5th line and so we say 5 x 2=10, we add this to 60.

Answer: 60+10= 70,

Explanation:

Physical change

★ Boiling of water

❤︎ freezing of water

❣︎ washing of clothes

♫︎ mixing black and brown stones

Chemical change

➪ making of dough

㋛︎ burning of wood

❥︎ cooking of the raw food

❁ burning of paper

ꨄ︎ rusting of iron

★★★➪➪➪➪ it was help to you

Answer: B. 430 K

Explanation:

According to Gibb's equation:

\(\Delta G=\Delta H-T\Delta S\)

\(\Delta G\) = Gibbs free energy  

\(\Delta H\) = enthalpy change  = +62.4 kJ/mol

\(\Delta S\) = entropy change  = +0.145 kJ/molK

T = temperature in Kelvin

\(\Delta G\)  = +ve, reaction is non spontaneous

\(\Delta G\)  = -ve, reaction is spontaneous

\(\Delta G\)  = 0, reaction is in equilibrium

\(\Delta H-T\Delta S=0\) for reaction to be spontaneous

\(T=\frac{\Delta H}{\Delta S}\)

\(T=\frac{62.4kJ/mol}{0.145kJ/molK}=430K\)

Thus the Reaction is spontaneous when temperature is 430 K.

Answer:

430 K

Explanation:

i just took the test on a pex :)

To calculate the molarity of the solution, we need to know the number of moles of BaI2 and the volume of the solution in liters.

First, let's calculate the number of moles of BaI2. We can use the formula:

Number of moles = Mass (in grams) / Molar mass

The molar mass of BaI2 can be calculated as follows:

Ba: atomic mass = 137.33 g/mol

I: atomic mass = 126.90 g/mol

2 x I = 2 x 126.90 g/mol = 253.80 g/mol

Total molar mass of BaI2 = 137.33 g/mol + 253.80 g/mol = 391.13 g/mol

Number of moles of BaI2 = 413 g / 391.13 g/mol ≈ 1.056 moles

Next, we need to convert the volume of the solution from milliliters to liters:

Volume of solution = 750 ml / 1000 = 0.75 L

Finally, we can calculate the molarity using the formula:

Molarity = Number of moles / Volume of solution

Molarity = 1.056 moles / 0.75 L ≈ 1.408 M

Therefore, the molarity of the BaI2 solution is approximately 1.408 M.

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Answer:

36 times

Explantaion:

The force exerted between two charged particles is directly proportional to the product of the charges and inversely proportional to the square of the distance between them.

In the case of S and q: The distance of separation is 1 unit

F(Sq) α S*q/1²

In the case of S and p: the distance is 6 units

F(Sp) α S*p/6²

therefore:

F(Sq) = 36 * F(Sp)

Answer:

Nuclear Waste

Explanation:

Unwanted radioactive products formed during nuclear reactions are called nuclear waste. Nuclear waste is a byproduct of nuclear power generation, medical procedures, and other activities that involve the use of radioactive materials. It can include spent nuclear fuel, radioactive liquids, and other radioactive materials that are generated during nuclear reactions.

Nuclear waste is highly radioactive and can pose a risk to human health and the environment if it is not properly managed. It must be stored, transported, and disposed of in a way that minimizes the potential for exposure to radiation and contamination.

Fossil fuels, nuclear fuels, and nuclear reactors are not related to the production of nuclear waste. Fossil fuels are non-renewable energy sources such as coal, oil, and natural gas that are formed from the remains of ancient plants and animals. Nuclear fuels are materials such as uranium and plutonium that are used as fuel in nuclear reactions. Nuclear reactors are facilities that use nuclear fuel to produce electricity through nuclear reactions.

Based on the mass of 1 mole of nitrogen atoms, 7.55 x 10²³ atoms of nitrogen have a mass of 17.56 grams.

The number of atoms in 1 mole of nitrogen = 6.02 * 10²³ atoms

The mass of 1 mole of atoms of nitrogen = 14 g

Hence, 6.02 * 10²³ atoms has a mass of 14.01 g

Mass of 7.55 x 10²³ atoms = 14.01 g/mol * 7.55 x 10²³ / 6.02 * 10²³

The mass of 7.55 x 10²³ = 17.56 g

So,7.55 x 10²³ atoms of nitrogen have a mass of 17.56 grams.

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Nature has provided us numerous gifts such as air, water, land, sunlight, minerals, plants, and animals. All these gifts of nature make our earth a place worth living. Existence on Earth would not be possible without any of these. Now, while these natural resources are present on Earth in plenty. Unfortunately, the necessity of most of these has increased extremely over the centuries due to growth in the human population.

To preserve nature in your day-to-day life:

Reduce waste: Avoid single-use items and recycle materials like paper, plastic, glass, and metal.

Conserve water: Use water wisely, fix leaks, and consider collecting rainwater.

Save energy: Opt for energy-efficient appliances and turn off lights and electronics when not in use.

This is only the tip of the iceberg. You could also help in massive projects to rid the ocean of all waste (I'm talking about TheOceanCleanup, search it up), or do something more small, like helping out in your local community.

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~~~Harsha~~~

Answer:

freezing point of water

Explanation:

I think it because the water change to ice

Answer:

freezing point

Explanation:

Answer:

0.2553669915026199 BaSO4

Explanation:

hi, give brainliest?

1. The products in this reaction are AlCl₃(aq) and H₂(g).

2. The reactants in this reaction are Al(s) and HCl(aq).

3. The balanced equation is 2Al(s) + 6HCl(aq) → 2AlCl₃(aq) + 3H₂(g)

4. This is a single displacement reaction.

5. The symbols indicate the physical states of the reactants and products.

A single displacement reaction, also known as a single replacement reaction, is a type of chemical reaction in which an element or ion in a compound is replaced by another element or ion.

In a single displacement reaction, one reactant is usually an element in its elemental state, while the other reactant is a compound.

In the given reaction,  "Al(s)" means solid aluminum, "HCl(aq)" means hydrochloric acid dissolved in water (aq means aqueous), "AlCl₃(aq)" means aluminum chloride dissolved in water, and "H₂(g)" means hydrogen gas.

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Answer:

Explanation:

Here, we want to get the number of moles in 4.25 g of CO

To get the number of moles, we have to divide the mass by the molar mass of CO

Mathematically:

The molar mass of CO is the sum of the atomic masses of carbon and oxygen

The atomic mass of carbon is 12 amu

The atomic mass of oxygen is 16 amu

The molar mass is thus:

Thus, we have the number of moles as:

Nadia will take 8 seconds to reach her friend's house.

Speed is the measure of the distance traveled by an object per unit of time. It is a scalar quantity and is typically expressed in units such as meters per second (m/s), miles per hour (mph), or kilometers per hour (km/h).

To calculate the time Nadia will take to reach her friend's house, we can use the formula;

time = distance / speed

where distance is the amount of space traveled by an object, and time is the duration of travel.

Put the values given in the problem, we have:

time = 24 meters / 3 m/s

time = 8 seconds

Therefore, Nadia will take 8 seconds.

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Hi there! Answer is below :)

Explanation:

For this question, we apply Boyle's Law and Charles' Law.

When you double the amount of pressure and temperature of a compound or mixture, the volume will decrease by a half. So, if the pressure and temperature are 2, and the volume is 1, and you double, your volume will be 0.5 and your pressure and temperature will be 4.

Best of Luck!

Explanation:

An uncontrolled chain reaction is a chain of nuclear reactions that take place subsequently, but not under controlled conditions. When the number of atoms grows exponentially the reaction is not under control.

The definition of nuclear fusion is: "a nuclear reaction in which atomic nuclei of low atomic number fuse to form a heavier nucleus with the release of energy". So in a fusion reaction small nuclei join to form a bigger nuclei.

The definition of nuclear fission is: "a reaction in which the nucleus of an atom splits into two or more smaller nuclei". So in a fission reaction a large nucleus breaks into smaller nuclei.

A fission chain reaction happens when a neutron and a fissile isotope interact with each other. This causes the release of some neutrons from the fissile nucleus. These released neutrons can interact with other fissile isotopes and cause the initiation of subsequent fission reactions. This is a controlled fission reaction. So, when extra neutrons are absorbed we have a controlled fission reaction.

The definition of critical mass is: "is the smallest amount of fissile material needed for a sustained nuclear chain reaction". So the critical mass is the amount of material necessary for a reaction to occur.

Answer:

The number of atoms grows exponentially the reaction ----> uncontrolled reaction

Small nuclei join to form a bigger nuclei ----> fusion

A large nucleus breaks into smaller nuclei ----> fission

Extra neutrons are absorbed ----> controlled reaction

This is the amount of material necessary for a reaction to occur ---> critical mass

Answer:B

Explanation: an object in motion will stay in motion until acted on by another force and an object in rest will stay in test until acted on by another force

Answer:

1. 1.62×10¹¹ nm

2. 4.8×10¹⁴ Hz

Explanation:

1. Determination of the wavelength.

We'll begin by converting 1.85 MHz to Hz. This can be obtained as follow:

1 MHz = 10⁶ Hz

Therefore,

1.85 MHz = 1.85 MHz × 10⁶ Hz / 1 MHz

1.85 MHz = 1.85×10⁶ Hz

Next, we shall determine the wavelength of the electromagnetic radiation. This can be obtained as follow:

Frequency (f) = 1.85×10⁶ Hz

Velocity of electromagnetic radiation (v) = 3×10⁸ m/s

Wavelength (λ) =?

v = λf

3×10⁸ = λ × 1.85×10⁶

Divide both side by 1.85×10⁶

λ = 3×10⁸ / 1.85×10⁶

λ = 162.16 m

Finally, we shall convert 162.16 m to nm. This can be obtained as follow:

1 m = 10⁹ nm

Therefore,

162.16 m = 162.16 m × 10⁹ nm / 1 m

162.16 m = 1.62×10¹¹ nm

Thus, the wavelength of the electromagnetic radiation is 1.62×10¹¹ nm

2. Determination of the frequency.

We'll begin by converting 625 nm to m. This can be obtained as follow:

1 nm = 10¯⁹ m

Therefore,

625 nm = 625 nm × 10¯⁹ m / 1 nm

625 nm = 6.25×10¯⁷ m

Finally, we shall determine the frequency the visible light as follow:

Wavelength (λ) = 6.25×10¯⁷ m

Velocity of light (v) = 3×10⁸ m/s

Frequency (f) =?

v = λf

3×10⁸ = 6.25×10¯⁷ × f

Divide both side by 6.25×10¯⁷

f = 3×10⁸ / 6.25× 10¯⁷

f = 4.8×10¹⁴ Hz

Therefore, the frequency of the visible light is 4.8×10¹⁴ Hz

Failure to heat the potassium chlorate for long would give small KCl and low percent yield of the KCl.

We know that we can obtain KCl when we heat potassium chlorate to a very high temperature, During this heating, the sample of potassium chlorate is decomposed and the products that we obtain in the process are oxygen and KCl respectively.

Now, we are often trying to compute the amount of the KCl that is obtained and thus the experimental percentage of the KCl from the amount of the KCl that is produced which is in turn dependent on the mass of the potassium chlorate that is decomposed.

If we do not heat the potassium chlorate long enough, then the amount of the KCl that is produced would be too small and we would have a very ow calculated percentage.

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An οxygen atοm has 8 prοtοns and 8 neutrοns. It alsο has 8 electrοns.

The number οf prοtοns in an atοm is equal tο the atοmic number, which is 8 fοr an οxygen atοm. Therefοre, the number οf electrοns must equal the number οf prοtοns, which is 8.

An atοm is the smallest unit οf matter that still retains the prοperties οf an element. Atοms are cοmpοsed οf a nucleus surrοunded by a clοud οf negatively charged electrοns. The nucleus cοntains pοsitively charged prοtοns and electrically neutral neutrοns.

The atοmic number is the number οf prοtοns in the nucleus οf an atοm. It is used tο identify an element, as each element has a unique atοmic number. Fοr example, the atοmic number οf οxygen is 8, as οxygen atοms cοntain 8 prοtοns in their nucleus.

Electrοns are negatively charged particles that οrbit the nucleus οf an atοm. Electrοns determine the chemical prοperties οf an atοm, as they fοrm bοnds with οther atοms. The number οf electrοns in an atοm is equal tο the number οf prοtοns, as atοms must have a neutral charge.

An οxygen atοm has 8 prοtοns, 8 neutrοns, and 8 electrοns. The atοmic number οf οxygen is 8, which is equal tο the number οf prοtοns, and the number οf electrοns is equal tο the number οf prοtοns.

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Answer:

Mass = 149g

Explanation:

N3 = 3x14u = 42

H12 = 12x1u = 12

P = 1x31u = 31

O4 = 4x16u = 64

42+12+31+64 = 149g

Statement C is not true. A combination reaction is not called retrosynthesis.

Retrosynthesis is a term used in organic chemistry to describe the process of planning the synthesis of a complex molecule by breaking it down into simpler precursor compounds. On the other hand, a combination reaction refers to a chemical reaction where two or more substances combine to form a single compound.

Examples of combination reactions include the reactions mentioned in statements A and D, where magnesium reacts with oxygen to form magnesium oxide and sodium reacts with chlorine to form sodium chloride, respectively.

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Answer:

radiation, hope this helps

A sample of 25.0-g pure iron at the 85 °C is dropped into 75 g of water at 20°C.  22.25 °C is the final temperature of the water-iron mixture.

The specific heat equation is represented as

Q = mcΔT

where,

Q = heat energy in Joules

m = mass of substance

c = specific heat

ΔT = change in temperature in K

For iron given that

m = 25 g

c = 0.45 J/g°C

T₁ = 85°C

Now by putting the values in the above formula then we get

Q₁ = mcΔT

    = 25 × 0.45 × (T₂ - 85)

    = 11.25 × (T₂ - 85)

For water given that

m = 75 g

c = 4.184 J/g°C

T₁ = 20°C

Now,

Q₂ = mcΔT

     = 75  × 4.184 × (T₂ - 20)

     = 313.8 × (T₂ - 20)

Now,

Heat is generated by the iron = Heat is gained by the water.

Q₁ = -Q₂

11.25 × (T₂ - 85) = - 313.8 × (T₂ - 20)

325.05 T₂ = 7232.25

T₂ = 22.25 °C

22.25 °C is the final temperature of the water-iron mixture.

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Answer:

B

Explanation:

The mixture gave off heat

6.02 x \(10^{20\) formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

To convert formula units of MgCl₂ to moles of MgCl₂, we need to use Avogadro's number, which relates the number of formula units to the number of moles.

Avogadro's number (NA) is approximately 6.022 x 10^23 formula units per mole.

Given that we have 6.02 x 10^20 formula units of MgCl₂, we can set up a conversion factor to convert to moles:

(6.02 x 10^20 formula units MgCl₂) * (1 mol MgCl₂ / (6.022 x 10^23 formula units MgCl₂))

The formula units of MgCl₂ cancel out, and we are left with moles of MgCl₂:

(6.02 x 10^20) * (1 mol / 6.022 x 10^23) = 0.1 mol

Therefore, 6.02 x 10^20 formula units of MgCl₂ is equal to 0.1 moles of MgCl₂.

It's important to note that this conversion assumes that each formula unit of MgCl₂ represents one mole of MgCl₂. This is based on the stoichiometry of the compound, where there is one mole of MgCl₂ for every one formula unit.

Additionally, this conversion is valid for any substance, not just MgCl₂, as long as you know the value of Avogadro's number and the number of formula units or particles you have.

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Answer:

301.15 K

Explanation: