Which of the following statements is true of stable isotopes?Select one:a. They naturally decay into new elements.b. They have half-lives.c. They spontaneously release nuclear particles and energy.d. They cannot be detected with a radioactive detector.

Answer:

True

Explanation:

You must first observe your data then form a hypothesis.

Answer:

\(E=2.85\times 10^{-23}\ J\)

Explanation:

Given that,

The frequency of light, \(f=4.3\times 10^{10}\ Hz\)

We need to find the energy of light. The formula for the energy is given by :

\(E=hf\) Where h is Planck's constant

Putting all the values of h and f, we get :

\(E=6.63\times 10^{-34}\times 4.3\times 10^{10}\\\\E=2.85\times 10^{-23}\ J\)

So, the energy of light is \(2.85\times 10^{-23}\ J\).

Answer:

Explanation:

1 mole of nickel contains 6.02 * 10^23 atoms

3.63 mols of nickel contain x atoms.

What you have is a proportion. A proportion consists of 2 ratios or 4 parts.

Of the 4 parts, you know three of them. The problem is to solve for the 4th.

1/3.63 = 6.02*10^23 / x               Cross multiply

x = 3.63 * 6.02* 10^23                Combine the right.

Answer: x = 2.19*10^24 atoms

Answer:

approx 2.45g

Explanation:

2HCl + Na2SO4 → 2NaCl + H2SO4

 2    :       1           :      2       :      1

0.05                                     0.025 (moles)

⇒ mH2SO4 = 0.025 × 98 = 2.45 g

Answer:

hey mate here is your answer

First, we have to know the formula of each of the substances:

calcium nitrate: Ca(NO₃)₂

ammonium fluoride:  NH4F

calcium fluoride: CaF2

dinitrogen monoxide: N2O

water: H2O

Next, we write the unbalanced reaction. We look at each element and count the number per side. The side with the less number of that element should get a coefficient to balance.

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3.5 moles of the sucrose would be seen to contain 2.1 * 10^24 molecules.

We have to know that the number of the molecules can be obtained from the Avogadro's law. The law that was put forward tell us that the number of the elementary entities such as the molecules, ions and the atoms in the substance would have to be 6.02 * 10^23.

If 1 mole of the sucrose is going to contain 6.02 * 10^23 molecules of the sucrose

Then

3.5 moles of the sucrose is going to contain 3.5 *  6.02 * 10^23/1

= 2.1 * 10^24

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The equilibrium expression for the reaction; C(s) + O₂(g) ------->CO₂(g) is [CO2]/[C] [O2] option C.

The equilibrium expression shows how much of the reactants are converted into products. If the equilibrium constant is large and positive, most of the reactants have been converted into products.

Thus, the equilibrium expression for the reaction; C(s) + O₂(g) ------->CO₂(g) is [CO2]/[C] [O2] option C.

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Answer:

velocity

Explanation:

because he is going 30 miles west

Answer:

Thermosphere

Explanation:

More specifically the ionosphere, since the ionosphere is the lower part of the thermosphere.

Hope this helps!

The society with the least negative effects on the environment is probably the one with a small population, traditional farming methods, no access to contemporary technology, and self-sufficient food production.

This is due to the fact that their way of living is less dependent on modern infrastructure and technology, both of which have a negative impact on the environment. Additionally, their agricultural methods are probably more environmentally friendly and sustainable.

The environmental effects of the other societies on the list would all be greater. Because of the use of fossil fuels and the production of products that require a lot of resources, a big, industrialized society with high levels of consumption would have a significant carbon footprint.

It would still take a lot of resources to maintain its infrastructure and create products in a less populous, highly industrialized society with moderate consumption levels, which would have a negative effect on the environment.

Given that the size of the population alone would necessitate significant resource consumption and infrastructure development, a big population with moderate industrialization and consumption levels would also have a big effect on the environment.

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Answer:

This bubbled-up magma is cooled by frigid seawater to form igneous rock. This rock (basalt) becomes a new part of Earth's crust. Seafloor spreading occurs along mid-ocean ridges—large mountain ranges rising from the ocean floor.

Explanation:

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Answer:

32.6 kj

Explanation:

Answer:

Volume = 3.4 L

Explanation:

In order to calculate the volume of CO₂ produced when 15.2 g of CaCO₃ is heated, we need to first write out the balanced equation of the thermal decomposition of CaCO₃:

CaCO₃ (s) + [Heat] ⇒ CaO (s) + CO₂ (g)

Now, let's calculate the number of moles in 15.2 g CaCO₃:

mole no. = \(\mathrm{\frac{mass}{molar \ mass}}\)

                 = \(\frac{15.2}{40.1 + 12 + (16 \times 3)}\)

                 = 0.1518 moles

From the balanced equation above, we can see that the stoichiometric molar ratios of CaCO₃ and CO₂ are equal. Therefore, the number of moles of CO₂ produced is also 0.1518 moles.

Hence, from the formula for the number of moles of a gas, we can calculate the volume of  CO₂:

mole no. = \(\mathrm{\frac{Volume \ in \ L}{22.4}}\)

⇒ \(0.1518 = \mathrm{\frac{Volume}{22.4}}\)

⇒ Volume = 0.1518 × 22.4

                 = 3.4 L

Therefore, if 15.2 g of CaCO₃ is heated, 3.4 L of CO₂ is produced at STP.

Answer:

17300ml

Explanation:

17.3 X 1000 = 17300ml

Answer:

The gas pressure is raised by decreasing the volume of a gas. ... The particles can collide more often with the walls of the container because the volume has decreased. They exert force on them each time they collide with the walls. More collisions mean more force, so it will increase the strain.  

hope this helped :)

Below is a list of the temperature change solution.

The source of the temperature change is

Initial Temperature - Final Temperature

Temperature measurements

It is a gauge for determining how hot or chilly a body is.

To quantify temperature variations,

The water and iron's beginning and final temperatures are noted.

To Iron

Iron that has been heated up is submerged in water.

Water is at a lower temperature, so both of the temperatures will change.

These information is saved.

Final temperature minus initial temperature equals temperature change.

a) The difference in temperature for metal is 200 - 100 = 100 0C

Water temperature change = 22.5

Change in temperature for both = 23.3

b) 0.7 for water

Metal 76.6 for iron

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Complete Question -

Put the Metal in the Water and Measure

Temperature Changes (Lead)

Measure the initial temperature of the water to the

nearest 0.1°C. Record in the data table.

Initial temperature of metal =

Initial temperature of water

Final temperature of both = [

27

DONE

26

25

24

23

Intro

Continue

AL

250 ml

=பா-©

200

150

100

1

27

O

°C

°C

Answer:

B

Explanation:

it is the correct composition of water

The net ionic equation for the reaction between potassium sulfide and magnesium iodide is S2- + Mg2+ -> MgS, as the potassium and iodide ions are spectator ions and do not participate in the reaction.

To determine the net ionic equation for the reaction between potassium sulfide (K2S) and magnesium iodide (MgI2), we first need to identify the ions present in each compound and then determine the products formed when they react.

Potassium sulfide (K2S) dissociates into two potassium ions (K+) and one sulfide ion (S2-):

K2S -> 2K+ + S2-

Magnesium iodide (MgI2) dissociates into one magnesium ion (Mg2+) and two iodide ions (I-):

MgI2 -> Mg2+ + 2I-

Now, we need to determine the possible products when these ions combine. Since potassium (K+) has a +1 charge and iodide (I-) has a -1 charge, they can combine to form potassium iodide (KI):

K+ + I- -> KI

Similarly, magnesium (Mg2+) and sulfide (S2-) can combine to form magnesium sulfide (MgS):

Mg2+ + S2- -> MgS

Now, we can write the complete ionic equation by representing all the ions present before and after the reaction:

2K+ + S2- + Mg2+ + 2I- -> 2KI + MgS

To obtain the net ionic equation, we remove the spectator ions, which are the ions that appear on both sides of the equation and do not participate in the actual reaction. In this case, the spectator ions are the potassium ions (K+) and the iodide ions (I-).

Thus, the net ionic equation for the reaction between potassium sulfide and magnesium iodide is:

S2- + Mg2+ -> MgS

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Answer:

Iron(III) Carbonate

Explanation:

thts it

Answer:

the answer is 373

Explanation:

K=°C + 273

K=100+273=373

The best answer 1 and 2, the carbon skeletons of which two amino acids enter metabolism at the level of pyruvate are alanine and serine or alanine and cysteine.

Metabolism refers to the chemical processes that occur within an organism to maintain life. These processes include the breakdown of nutrients to release energy and the synthesis of molecules that the body needs for growth and repair. There are two main types of metabolism: catabolism, which involves the breakdown of molecules to release energy, and anabolism, which involves the synthesis of molecules using energy.

The rate at which an individual's metabolism operates can affect their weight, with a faster metabolism generally leading to a higher rate of calorie burn and a slower metabolism leading to a lower rate of calorie burn. However, factors such as genetics, age, and sex also play a role in determining an individual's metabolism. Additionally, lifestyle factors such as diet and physical activity can also impact metabolism, with regular exercise and a balanced diet known to help boost metabolism.

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Answer:

Option A, C, D

Explanation:

A reversible adiabatic process is an isentropic process as entropy remains constant. Thus,

Entropy change (Delta S) = integral of (Q_rev)/T

Thus, option A and C are correct

For a reversible process, entropy generation is a positive quantity or zero. hence, statement B is not true

In an Adiabatic processes, entropy do not decrease. Hence, option D is also correct

Answer:

Blowing up a balloon involves forcing additional air particles from your lungs into the balloon. These particles hit the inside walls of the balloon creating enough air pressure to force the rubber of the balloon to expand and the balloon to inflate.

Explanation: hopes it helps :)

Answer:

C10H200

Explanation:

The molecular formula C10H20O (molar mass : 156.27 g/mol) may refer to: Citronellol. Decanal.

The molar mass of menthol (\(\rm C_10H_{20}O\)) is 156.3 g/mol.

To calculate the molar mass of menthol (\(\rm C_10H_{20}O\)), we need to determine the sum of the atomic masses of all the individual atoms in the compound.

The atomic masses of the elements are as follows:

C (carbon) = 12.01 g/mol

H (hydrogen) = 1.01 g/mol

O (oxygen) = 16.00 g/mol

Now, let's calculate the molar mass of menthol:

Molar mass of menthol = (10 * molar mass of C) + (20 * molar mass of H) + (1 * molar mass of O)

                      = (10 * 12.01 g/mol) + (20 * 1.01 g/mol) + (1 * 16.00 g/mol)

                      = 120.1 g/mol + 20.2 g/mol + 16.0 g/mol

                      = 156.3 g/mol

Therefore, the molar mass of menthol (\(\rm C_10H_{20}O\)) is 156.3 g/mol.

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The element that helps the heart and is found in nuts and legumes is magnesium.

In this case, we are being asked about the element that promotes normal heart rhythm and muscle function and can be found in nuts, legumes, whole-grain products, and dark green vegetables. We have to know that this element is one of the key elements that are important to the health of a person.

Now we have to look at the options tat we have and see that magnesium is the element that is abundant in the nuts and the legumes and have been linked to the effective function of the heart.

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The Voltage is the pressure from the electrical circuit of the power source that passes the current.

The Voltage is defined as the pressure from the electrical circuit of the power source that will passes the charged electrons that is the current through the conducting loop, it will enable them to do work  because of the illuminating the light. The in simple terms is : voltage = pressure, and it is denoted as the volts and the symbol is the V.

The voltage is described as the force that causes the flow of the charged particles. The Voltage is also called as the electromotive force.

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Answer: Thomson

Explanation: Thomson proposed the plum pudding model of the atom.

Answer:

0.138 moles of oxygen are needed to combine with 0.276 moles of carbon.

Explanation:

Given data:

Moles of oxygen needed = ?

Moles of carbon present = 0.276 mol

Solution:

Chemical equation:

2C  + O₂      →        2CO

Now we will compare the moles of carbon with oxygen.

              C            :          O₂  

              2            :            1

             0.276     :        1/2×0.276  = 0.138 mol

Thus, 0.138 moles of oxygen are needed to combine with 0.276 moles of carbon.

Answer:

Explanation:

i) in keeping industrial machine cool

ii) in textile inustries for dying clothes