this occurs when energy is added or removed

Matter is everything that occupies physical space. Everything on earth, including the atmosphere, that occupies space and has a certain mass is considered matter.

Anything that occupies space and has mass is considered to be matter. The world around you is composed of matter. A general phrase for the "stuff" all around you is matter. An item has a quantifiable size or volume when it occupies space. A measurement of matter's resistance to acceleration is its mass. Everything around us takes up space. Now, we are aware that matter refers to everything that takes up space. Atoms are the minuscule constituents of matter. Typically, we focus our studies solely on the three states of matter: solid, liquid, and gas.

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Answer:

B. Free water

Answer:

ITS FALSE electricity doesn't travel through wood same with cement!

Answer:

NaCl= 200 gmolar mass of NaCl=58.44 g/mol

Explanation:

Explanation:

D=m÷v

D=146÷(3×4.5×7)

D=146÷94.5

D=1.54g/cm^3

The field of chemistry called Kinetics explains why bromine trifluoride reacts one way and water vapor reacts another during a reaction.

What is Energy?

Energy is a fundamental concept in physics, often defined as the ability to do work. It can take many different forms, including thermal energy, kinetic energy, potential energy, electromagnetic radiation, and chemical energy, among others. Energy can be transferred from one system to another, and it can also be converted from one form to another. The SI unit of energy is the joule (J), although other units such as the calorie and the electronvolt are also used in specific contexts.

The field of chemistry that explains why bromine trifluoride reacts violently with water vapor while water vapor reacts differently is called reaction thermodynamics. Reaction thermodynamics is concerned with the energy changes that occur during chemical reactions, including the free energy change (ΔG), enthalpy change (ΔH), and entropy change (ΔS).

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A mass of 9.1 1031 kilograms (Kg). A wavelength of 1010m, or around the size of an atom, can be calculated from the de Broglie relation. Due to this, we may directly examine the atomic structure of a crystal using electron microscopes.

Using the de Broglie relation between the momentum p and the wavelength of an electron (=h/p, where h is Planck constant), the wavelength of an electron is computed for a given energy (accelerating voltage). When the wavelength is expressed in meters, 1/ stands for the number of waves in a wave train that can fit within a length of one meter, or, if the wavelength is expressed in centimeters, the number of waves that can fit within a length of one centimeter.

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Answer:

Methane gas will burn in air. This is an example of a combustion reaction. This type of reaction produces CO2 and H2O.

Explanation:

Elements: C, H, O

Reactants: 1, 4, 2

Products: 1, 2, 3

Please mark me the brainliest!?!

Answer: the answer is B: Minerals dissolve and crystallize! :D

Explanation: hope this helps!

It is a physical change when ice cube is placed in the sun. Later there is a puddle of water. Later still the puddle is gone.

Water that has lost all of its thermal energy freezes, changing from a liquid to a solid. This is something we encounter frequently in daily life. When the water gets cold enough, puddles, ponds, lakes, and even portions of oceans begin to freeze. Surface water on Earth freezes at low temperatures and turns into solid ice.

When molecules move more quickly due to heat energy, the hydrogen bonds between molecules are broken, resulting in the formation of liquid water. The water molecules actually absorb energy during the melting process.

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Using complete sentences, I will explain how a set of experimental data can be accurate but not precise, precise but not accurate, and neither accurate nor precise.

a. If a set of experimental data is accurate but not precise, it means that the data is close to the true value or target, but the measurements or values are not consistent or repeatable. In other words, the data points may be scattered or vary widely from each other, but their average or mean value is close to the true value. This can happen due to random errors or uncertainties in the measurement process.

b. On the other hand, if a set of experimental data is precise but not accurate, it means that the measurements or values are consistent or repeatable, but they are not close to the true value or target. In this case, the data points may cluster tightly around a single value, but that value may be different from the expected or true value. This can happen due to systematic errors or biases in the measurement process.

c. Finally, if a set of experimental data is neither accurate nor precise, it means that the measurements or values are neither close to the true value nor consistent or repeatable. The data points may be scattered or vary widely from each other, and their average or mean value may not be close to the true value. This can happen due to a combination of random errors and systematic errors in the measurement process.

In summary, accuracy refers to how close the measured values are to the true value or target, while precision refers to the consistency or repeatability of the measurements. A set of experimental data can be accurate but not precise, precise but not accurate, or neither accurate nor precise, depending on the combination of these factors.

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Answer:

Answer:

speed = 86.99197 miles per hour

Explanation:

Answer: Diurnal temperature range is the difference between __maximum______ and ____minimum____ temperature each ___1 day______.

Explanation:

Answer: True

Explanation: Hopes this helps- Lily ^_^

Explanation:

proton number and neutron number sums up to form the mass number

Answer:

Neutrons & protons

Explanation:

hope it's help..

Answer:

Digestive

Explanation:

Answer:

15

Explanation:

Because the ratio of copper in the solution is 15

This problem is providing us with the end of the electron configuration an element as s²p⁴ and asks for the most commonly formed ion. At the end, the answer is b Y²⁻.

In chemistry, when analyzing electron configurations, one must first take into account how the energy levels must be filled with electrons.

Now, note the problem states that the electron configuration ends by s²p⁴, which means it is closer to complete the octet so it needs two electrons in order to do so, as it behaves as a nonmetal.

Therefore, the most commonly ion formed by this element is Y²⁻, because of the fact that it needs two electrons to complete the octet and thus become chemically stable and likely to bond with a metal.

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The amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

To calculate the molarity of Kool Aid desired, we need to determine the number of moles of Kool Aid powder and sugar in the package. Since the molecular formula for sugar is C12H22O11, we can calculate its molar mass as follows:

Molar mass of C12H22O11 = (12 * 12.01) + (22 * 1.01) + (11 * 16.00)

= 144.12 + 22.22 + 176.00

= 342.34 g/mol

Given that the package contains 4.25 grams of Kool Aid powder, we can calculate the number of moles of Kool Aid powder using its molar mass:

Number of moles of Kool Aid powder = Mass / Molar mass

= 4.25 g / 342.34 g/mol

≈ 0.0124 mol

Similarly, for the sugar, which has a molar mass of 342.34 g/mol, we can calculate the number of moles of sugar using its mass:

Number of moles of sugar = Mass / Molar mass

= 192.00 g / 342.34 g/mol

≈ 0.5612 mol

Now, to calculate the molarity of the desired Kool Aid solution, we need to determine the volume of water. Given that 1.06 quarts is equal to 1 liter, and we have 2.00 quarts of water, we can convert it to liters as follows:

Volume of water = 2.00 quarts * (1.06 liters / 1 quart)

= 2.12 liters

To find the molarity, we use the formula:

Molarity (M) = Number of moles / Volume (in liters)

Molarity of Kool Aid desired = (0.0124 mol + 0.5612 mol) / 2.12 L

≈ 0.286 M

To prepare 65 mL of the desired molarity, we can use dilution calculations. We need to determine the volume of concentrated solution and the volume of water needed.

Let's assume the concentration of the concentrated Kool Aid solution is C M. Using the dilution formula:

(C1)(V1) = (C2)(V2)where C1 is the initial concentration, V1 is the initial volume, C2 is the final concentration, and V2 is the final volume.

Given that C1 = C M and V1 = V mL, and we want to prepare a final volume of 65 mL (V2 = 65 mL) with a final concentration of 0.286 M (C2 = 0.286 M), we can rearrange the formula to solve for the volume of the concentrated solution:

(C M)(V mL) = (0.286 M)(65 mL)

V mL = (0.286 M)(65 mL) / C M

So, the amount of concentrated solution needed is (0.286 M)(65 mL) / C M, and the amount of water needed is 65 mL minus the volume of the concentrated solution.

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First, we need to make the exponent of 10 the same for both.

So let's transform 6.5500 x 10^5 into some number x 10^3.

For this, we need to move the dot to the right, some places where it gives the number 3. In this case, 2 places.

655.00 x 10^3

now we can sum the numbers

8.6500 x 10^3 + 655.00 x 10^3 = 663.65 x 10^3

now we need to transform this number into scientific notation. For this, must have only one number before the dot(on the left side of the dot). We will move the dot to the left, 2 places:

6.6365 x 10^5

Answer: 6.6365 x 10^5

It is given that calories and joules are two kinds of units of measurement of energy, then 32.3kj is equivalent to  7719calories.

Heat energy is the energy that is transferred from one object to another due to a difference in temperature. Heat energy is measured in joules (J). Joules and calories are both units of energy. A joule is the SI (International System of Units) unit of energy, while a calorie is a unit of energy used in the imperial system.

A joule is a measure of energy that is equal to the energy expended in applying a force of one newton to a body that is moving one meter in the direction of the force. A calorie is a unit of energy that is equal to the amount of energy needed to raise the temperature of one gram of water by one degree Celsius.

1 calorie is =  4.184 joules.

Then 32.3kj is equal to:

\(32.3 * 10^3/4.184 = 7719calories\)

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The given amount of \(CaCl_{2}\) is enough to precipitate all of the carbonate ions in the solution.

To determine if the given amount of \(CaCl_{2}\) is enough to precipitate all of the carbonate ions, we need to compare the stoichiometric ratio between \(CaCl_{2}\) and \(Na_{2}CO_{3}\) and calculate the maximum amount of carbonate ions that can be precipitated.

The balanced equation for the reaction between \(CaCl_{2}\) and \(Na_{2}CO_{3}\) is

\(CaCl_{2}\) + \(Na_{2}CO_{3}\) -> \(CaCO_{3}\) +

From the equation, we can see that one mole of \(CaCl_{2}\) reacts with one mole of \(Na_{2}CO_{3}\) to produce one mole of \(CaCO_{3}\).

First, we calculate the number of moles of sodium carbonate (\(Na_{2}CO_{3}\)) in 0.800 g. The molar mass of \(Na_{2}CO_{3}\) is 105.99 g/mol, so:

Number of moles of \(Na_{2}CO_{3}\) = 0.800 g / 105.99 g/mol = 0.00755 mol

Since the stoichiometric ratio between \(CaCl_{2}\) and \(Na_{2}CO_{3}\) is 1:1, the maximum amount of carbonate ions that can be precipitated is also 0.00755 mol.

Next, we calculate the number of moles of \(CaCl_{2}\) in 30.0 mL of 0.300 M solution:

Number of moles of \(CaCl_{2}\) = 0.300 mol/L * 0.0300 L = 0.009 mol

Comparing the moles of carbonate ions (0.00755 mol) with the moles of \(CaCl_{2}\) (0.009 mol), we can see that the amount of \(CaCl_{2}\) is in excess.

Therefore, the given amount of \(CaCl_{2}\) is enough to precipitate all of the carbonate ions in the solution.

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The half-life of the radioactive sample is T₁/₂ = (t / 7.22) s where t is the time taken for the number of atoms to reduce from N₀ to 0.5 N₀.

Given that the number of atoms present in a radioactive sample is 1.40 x 10¹⁵ atoms and it has an activity of 5.90 x 10¹¹ Bq.

To determine the half-life (in s) of a radioactive sample, we can use the formula:

N = N₀ / 2^(t/T₁/₂)

Where, N₀ is the initial number of atoms,N is the final number of atoms,t is the time elapsed,T₁/₂ is the half-life time

In this case, as we want to find T₁/₂, we can manipulate the formula and write:T₁/₂ = t / log₂(N₀ / N)

We know that T₁/₂ is the time required for half of the radioactive atoms to decay.

Hence, we can say that when N = 0.5 N₀, then t = T₁/₂

Substituting the given values,N₀ = 1.40 x 10¹⁵ atoms

N = 0.5 N₀ = 0.5 x 1.40 x 10¹⁵ atoms = 7.00 x 10¹⁴ atoms

And, t = T₁/₂

Hence,T₁/₂ = t / log₂(N₀ / N)= T₁/₂ = t / log₂(1.40 x 10¹⁵ / 7.00 x 10¹⁴)= T₁/₂ = t / log₂(150)= T₁/₂ = t / 7.22

Therefore, the half-life of the radioactive sample is T₁/₂ = (t / 7.22) s where t is the time taken for the number of atoms to reduce from N₀ to 0.5 N₀.

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The answer to the question is that it will take approximately 300 days for the activity of the radium sample to decrease to 1.0 mci.


To solve the problem, we can use the formula for radioactive decay:

A = A0 (1/2)ⁿ  (n=t/T)

where A is the activity of the radium sample at any given time, A0 is the initial activity, t is the time elapsed, and T is the half-life.

We are given that the initial activity, A0, is 32.0 mci and the half-life, T, is 75 days. We are asked to find the time, t, it takes for the activity to decrease to 1.0 mci.

Plugging in the values, we get:

1.0 = 32.0 (1/2)ⁿ  (n=t/75)

Simplifying, we can divide both sides by 32.0 to get:

(1/32.0) = (1/2)ⁿ (n=t/75)

Taking the natural logarithm of both sides, we get:

ln(1/32.0) = (t/75) ln(1/2)

Solving for t, we get:

t = (75 ln(1/32.0)) / ln(1/2)

Using a calculator, we get:

t ≈ 300 days

Therefore, it will take approximately 300 days for the activity of the radium sample to decrease to 1.0 mci.

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-23.4kj is  the standard gibbs free energy associated with the formation of ammonia from nitrogen and hydrogen at 25 c and 500 c

-

The temperature is 25 deg C or 298 K.

ΔGo =−RTlnK=−8.314×298×ln1.3×104 =−23469J=−23.4kJ

Hence, the standard free energy change is -23.4 kJ

Gibbs free energy, thermodynamics The word "free energy" refers to a thermal potential that can be utilized to determine the maximal amount of work that a thermodynamically closed system can perform at constant pressure and temperature. The change in limitless energy that occurs when a chemical is created from its components in their most thermodynamically states under appropriate conditions is referred to as the free basic energy of formation. Ammonia is a colourless gas that has a strong suffocating odour. It easily dissolves in the water, forming an ammonium hypochlorite that can cause discomfort and burns. Under pressure, ammonia gas compresses easily and formation a clear, colourless liquid.

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Answer:

I think you can predict it by the number of protons in it.

Substance X - compound because it is a combination of elements

Substance Y - Mixture because it is a  combination of substances

Substances Z - Element because it contains atoms

Substance T -   compound because it is a combination of elements

We know that an atom is the smallest particle of a substance that can take part in a chemical reaction. A compound is formed by a mixture of atoms. An element is obtained as the smallest independent part of a substance.

Now let use classify the samples shown in the images attached.

Substance X - compound because it is a combination of elements

Substance Y - Mixture because it is a  combination of substances

Substances Z - Element because it contains atoms

Substance T -   compound because it is a combination of elements

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Answer:

it will probably flame up or explode or maybe start boiling

Answer:

Lumayan poin gratis...

gw gatau lu pake bahasa apaan njink