In the reaction, HCl (aq) + NaHCO3 (aq) – NaCl (aq) + H20 (1) + CO2 (g), which of the
reactants or products is a gas?

NaHCO3

NaCl

H2O

CO2

Answer:

-142 joules ( or -100 joules when accounting for significant figures)

Explanation:

q = m c delta T

q = (.71)(2)(20 - 120)

q = (.71)(2)(-100)

q = -142 joules

The specific heat of carbon is 0.71 J/g.°C then the amount of energy which is given off as a 2 gram piece of graphite cools from 120°C to 20°C is -142 Joules.

Amount of absorbed heat by any substance will be calculated by using the below equation:

Q = mcΔT, where

On putting all these values, we get

Q = (2)(0.71)(-100) = -142 J

Hence, -142 Joules is the value of given off energy.

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The answer is in the photo.

A chemical change means that a new substance was formed. Different from what it was before the change took place.

Flammability and decomposition are examples of chemical changes.  <<<This is chemical change. An example can be seen in fruit. When a cut apple stays to long in the open it turns brown. This is because it is oxidized. Even if the apple tastes the same on the molecular level it has changed

Chemical changes involve a rearrangement of atoms to form new substances.  <<< It states even in the definition of chemical change that a new substance has to be formed

Chemical changes can often be identified by the formation of a gas or a solid or the release of heat.  <<< In a chemical change something extra may be created. This is different from an ice cub melting (which would be physical change). Although it goes from solid to liquid it is still water, and there is no extra product

Nothing is altered at the molecular level during a chemical change. <<<This is false

Hope this helped!

Answer:

Concentration of the acid = 1.05M

Explanation:

Given parameters:

Volume of acid = 14.0mL = 0.014L

Volume of base = 28.23mL = 0.02823L

Concentration of the base = 0.521M

Unkown:

Concentration of acid = ?

The reaction equation is given below:

          CH₃COOH + NaOH → CH₃COONa + H₂O

To obtain the unknown concentration of the acid used in the reaction, we simply work from the known parameters of the given base.

Procedure:

       Number of moles of base = concentration of base x volume

      Number of moles of base = 0.521 x 0.02823 = 0.0147mol

      1mole of the base neutralize on mole of acid,

    Therefore, 0.0147mol of the acid would be neutralized by the base.

To find the concentration of the acetic acid,

Concentration of acid = [tex]\frac{Number of moles of acid}{Volume of acid}[/tex]

Concentration of acid = [tex]\frac{0.0147}{0.014}[/tex]

Concentration of the acid = 1.05M

Answer:  1.05M

Explanation: took usatestprep test

Answer:

wind i think

Explanation:

Answer:

Hello! Your answer is Plants.

Answer:

pulmonary vein

Explanation:

The pulmonary vein is the only vein in the body that carries oxygen rich blood.

Answer:

b. Steady surface temperature increases were noted between the 1970’s and 90’s.

Explanation:

It was the notable observation of steady rise in surface temperature on earth around the 1970’s that brought the issue of climate change into limelight.

One of the effect of climate change is that it causes global warming. Global warming is attributed to greenhouse gases which traps heat on the earth surface and causes the surface to warm. This can lead to melting of polar ice and an increase in water volume in oceans.

Answer:

b. Steady surface temperature increases were noted between the 1970’s and 90’s.

Explanation:

Answer:

Q6. scientists can monitor volcanoes to estimate when they are likely to erupt. Scientists can use a variety of techniques to do this, such as: seismometers - used to measure earthquakes occurring near an eruption. tiltmeters and GPS satellites – these devices monitor any changes in landscape. These signs may include very small earthquakes beneath the volcano, slight inflation, or swelling, of the volcano and increased emission of heat and gas from vents on the volcano,

Q7 They may need to move or they may need to evacute because when a volcano erupts it kills people and animals and burns every thing in its way. one way a volcano can kill someone is the thick ash clouds which make it hard to see and survive through.

Explanation:

1. Metamorphic rocks form from heat and pressure changing the original or parent rock into a completely new rock.

2.There are two basic types.

Intrusive igneous rocks crystallize below Earth's surface, and the slow cooling that occurs there allows large crystals to form.

Extrusive igneous rocks erupt onto the surface, where they cool quickly to form small crystals. Some cool so quickly that they form an amorphous glass.

3. Erosion is the wearing away of the land by forces such as water, wind, and ice. Erosion has helped to form many interesting features of the Earth's surface including mountain peaks, valleys, and coastlines. There are many different forces in nature that cause erosion.

4. • Frost and Salt Wedging. One of the more common forms of mechanical weathering is frost wedging. ...

• Unloading and Exfoliation. ...

• Water and Wind Abrasion. ...

5. Plucking, also referred to as quarrying, is a glacial phenomenon that is responsible for the erosion and transportation of individual pieces of bedrock, especially large "joint blocks". This occurs in a type of glacier called a "valley glacier".

6. Rusting, a well known example of corrosion, is the breakdown of the metal iron. The reactants of this chemical reaction are iron, water, and oxygen, and the product is hydrated iron oxide, better known as rust. Rust, unlike iron, is crumbly, orange, and pretty much useless for building things.

7. rainfall made sufficiently acidic by atmospheric pollution that it causes environmental harm, typically to forests and lakes. The main cause is the industrial burning of coal and other fossil fuels, the waste gases from which contain sulfur and nitrogen oxides, which combine with atmospheric water to form acids.

8. Magma that cools quickly forms one kind of igneous rock, and magma that cools slowly ...

9. When magma rises from deep within the earth and explodes out of a volcano, it is called lava, and it cools quickly on the surface. Rock formed in this way is called extrusive igneous rock.

10. When water becomes saturated with dissolved minerals, particles can crystallize out of the water and form minerals. Chemical rocks form when minerals crystallize directly from water.

11. Sugar dissolves faster in hot water than it does in cold water because hot water has more energy than cold water. When water is heated, the molecules gain energy and, thus, move faster.

12. Gypsum and halite

13. the repeating pattern of a mineral's particles forms a solid called a crystal. A crystal has flat sides, called faces, that meet at sharp edges and corners. a mineral has a definite chemical composition or range of compositions.

I hope this is what you’re looking for if not I’m very sorry :/

The formation of rocks, types of weathering, and characteristics of minerals are explained in detail. For instance, metamorphic rocks are formed by heat and pressure, igneous rocks are divided into intrusive and extrusive, and mechanical weathering includes processes such as frost wedging and thermal expansion.

1. Metamorphic rock needs heat and pressure to form.

2. The two types of igneous rock are intrusive (plutonic) and extrusive (volcanic).

3. Water, wind, and ice are three things that erode rocks.

4. Three examples of mechanical weathering include frost wedging, thermal expansion, and abrasion.

5. Plucking is when a glacier picks up rocks in the lower side.

6. Rust is an iron oxide (a type of corrosion) that forms in the presence of oxygen and moisture.

7. Acid rain is precipitation that contains higher than normal amounts of sulfuric or nitric acids. It's typically from pollutant gases in the atmosphere.

8. Magma cools slowly below the Earth’s surface.

9. Lava cools quickly on the Earth’s surface.

10. When minerals crystallize from water solutions, the narrow channels form veins.

11. When the hot water cools crystals form.

12. Halite, a mineral form of salt, is often left behind by evaporation.

13. The repeating pattern in a mineral is called its crystal lattice.

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Answer:

2400 mL

Explanation:

[tex]Ca + 2HCl \implies CaCl_2 + H_2[/tex]

According to this equation, the stoichiometric ratio between [tex]Ca[/tex] and [tex]HCl[/tex] for the complete reaction is 1:2.

We know that the number of moles of [tex]Ca[/tex] can be calculated using the mole formula. (number of moles = mass / molar mass)

Moles of Calcium = [tex]\frac{60}{40}[/tex] = 1.5 mol

So the moles of [tex]HCl[/tex] = [tex]1.5 \times 2[/tex] = 3.0 mol

Volume of HCl solution = Moles of HCl/ concentration of HCl

Volume of HCl solution = [tex]\frac{3}{1.25}[/tex] = 2400 mL

The answer is:

The total energy gained is equal to 3091 Joules.

To calculate how much energy is gained by the gold, we need to use the formula to calculate the heat transfer, it's defined by the following equation:

[tex]Q=mc\Delta T[/tex]

We know that the gold melts completely (it reached its melting point or fusion temperature), so, we need to rewrite the equation as follow:

[tex]Q=mc\Delta T+m\Delta H_{fusion}[/tex]

Where,

m,is the mass of the material

c, is the specific heat of the material

ΔT, is the change of temperature.

ΔH, is the heat of fusion of the material.

So, from the statement we know the following information:

[tex]m=15.74grams\\\\\Delta T=1064\°C-32\°C=1032\°C\\\\c=0.1291\frac{Joules}{gram\°C}\\\\m\Delta H_{fusion=15.71grams*\frac{63.5Joules}{gram}=997.59Joules[/tex]

Then, substituting and calculating, we have:

[tex]Q=mc\Delta T+m\Delta H_{fusion}[/tex]

[tex]Q=15.71grams*0.1291\frac{Joules}{gram\°C}*1032\°C+997.59Joules[/tex]

[tex]Q=2093.06Joules+997.59Joules=3090.65Joules=3091Joules[/tex]

Hence, we have that the total energy gained is equal to 3091 Joules.

Have a nice day!

Answer:

Two half lives.

Explanation:

It is known that the decay of isotopes and radioactive material obeys first order kinetics.

Also, it is clear that in first order decay the half-life time is independent of the initial concentration.

That means for a sample 100% to decay to 50 % it will take one half-life, and to decay the remaining 50% to 25% it will take another half-life.

So, for a sample has 25% parent and 75% daughter it will have two half-lives.

Answer:

Ionic bonds are made by a transfer of electrons. Covalent bonds are made by sharing electrons.

Explanation:

For ionic bonds, use the group number to help you determine how many electrons an element can give or receive (Group 1 gives 1 electrons, group 2 gives 2 electrons, group 3A gives 3, group 5A receives 3, group 6A receives 2, and group 7A receives 1).

Covalent bonds have to be worked out using the total number of valence electrons and the octet rule.

Answer:

The second step would be for formation of solute-solvent intermolecular bonds. Forming bonds always releases energy this would be an exothermic process

Explanation:

Answer:

There are three steps in solvation: the breaking of bonds between solute molecules, the breaking of intermolecular attractions between solvent molecules, and the formation of new solute-solvent attractive bonds. Energy is absorbed during the first two steps, and it is released during the last step.

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Raising the temperature and change the pressure.

Answer:

The molar volume increases

Explanation:

By the Law of Charles-Gay Lussac (for ideal gases) which can be applied to a real gas, we can say that when a fixed mass of gas is heated, at constant pressure, its volume increases.

Law of Charles-Gay Lussac says:

V(Volume)= K(proporcionality constant)* T(Temperature)

or

Initial Volume/Inicial Temperature=Final Volume/Final Temperature

You can calculate the Final Volume.

This is because the temperature increases the energy of the molecules and also their speed, therefore the volume increases.

For example, if two moles of a gas have a constant pressure, as their temperature increases, their volume will also do so.

Answer:

change in volume

Explanation:

Chemical change is a type of change in which new substances are formed. There are various signs that indicate the occurence of a chemical change.

They include;

Therefore, in this case, change in volume is not an indicator that a chemical change has occurred.

Answer:

Change in Volume

Explanation:

Got it right on Odessyware ;) Have a Nice Day!!!!!

it would be bbbbbbbbbbbbb

Answer: B. To qualify for publication, scientists are required to submit lists of materials and procedures.

Explanation:

Scientist publish their research reports, articles in journals, magazines and other authentic areas associated with the data of the scientific community. To satisfy the need of the publication the scientists are required to submit the entire research procedure which includes the materials and protocol used to conduct the research. This process will help the other scientists to conduct the same research and this will help them to make a contradiction or acceptance of the published research based upon the similarities and differences in the results of research.

Answer:D. It impacts a much larger area and obtains less oil than drilling.

Explanation:

Oil extraction from tar sands is environmentally detrimental as it removes biological communities, creates large open pits, and yields less oil for a greater impacted area compared to traditional drilling.

The drawback of oil extraction from tar sands is that it has significant environmental impacts. Unlike traditional oil drilling, which typically occurs in more discrete locations, tar sands require surface mining, which involves removing large areas of land, including any biological communities that reside in that area. This process creates a deep, open pit. Additionally, the process impacts a much larger area while yielding a relatively smaller amount of oil compared to conventional drilling methods. One of the environmental impacts includes the release of carbon dioxide, methane, and other air pollutants that contribute to atmospheric deterioration and climate change.

WOW! I never thought of that.... Is this a question on the test?

If you are trying to observe a cell wall, you should look at a plant cell. There are only two different types of cells, which are plant and animal cells. The plant cell is the only one which contains a cell wall. Animal cells actually only have a cell membrane.

Cell walls, commonly found in plant or bacterial cells, have distinct structures based on the type of organism. Plant cell walls consist of cellulose, providing rigidity and structure, while bacterial cell walls contain peptidoglycan for protection and shape. Unlike these, animal cells do not have a cell wall.

If you wanted to look at a cell wall, the most common types you would observe would be those of plants or bacteria, as they are widely studied in biology. Plant cell walls are primarily made up of cellulose, giving them rigid structure for support, whereas bacterial cell walls are mainly composed of peptidoglycan, which provides protection against environmental stressors.

When observing a plant cell wall under a microscope, what you are seeing is a rigid layer outside the cell membrane that provides structure and support. For bacteria, the cell wall is a protective layer outside the cell membrane, which protects the bacterium and gives it shape.

In contrast, animal cells do not have a cell wall, but a cell membrane instead, which provides a flexible structure. It's essential to remember that cell walls vary significantly in composition and structure among different groups of organisms.

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The answer is A. 10.

Answer:

10

Explanation:

Final answer:

The pairs of valence electrons in diatomic oxygen molecules that do not participate in bonding are called lone pairs or unshared pairs (option D). These pairs are significant as they influence the molecule's shape and properties.

Explanation:

The name given to the pairs of valence electrons that do not participate in bonding in diatomic oxygen molecules is lone pair. These are also referred to as non-bonding electron pairs or an unshared pair (option D). In diatomic oxygen (O₂), each oxygen atom has six valence electrons. When two oxygen atoms form a molecule, they share two pairs of electrons, creating a double covalent bond. However, not all of the oxygen atom's electrons are involved in this bond; the remaining four electrons on each oxygen atom form two lone pairs.

The lone pairs are the electron pairs that reside in the outermost shell of the atom (valence shell) but are not shared or bonded with other atoms. These unshared electron pairs are responsible for the molecule's shape and properties, even though they do not participate directly in the bond formation with another atom.

Answer:add the picture and i can tell you

It is seen that in first and third ones elements are not changed but only their chemical arrangements are changed. both are chemical reactions.

In the second and last one elements are changed after the reaction and as we know non chemical reactions are not capable of doing that so they are nuclear reactions.

There are other ways to tell like checking number of neutrons as well but in this simple case I don't think it is necessary to check those.

Good luck!

Answer:

B and D

Explanation:

Option A is incorrect as it is a neutralization reaction. Option C is incorrect as it an oxidation reaction, the rusting of iron to form iron oxide.  

Option B and D are nuclear reactions called alpha decay.  

In an alpha decay, a helium atom is released, and the daughter nucleus formed has atomic number 2 less than the parent nucleus and mass number 4 less than the parent nucleus.  

Answer:

C. Runoff from heavy rainfall forms narrow, shallow channels.

Explanation:

Erosion is the gradual washing away of the top layer of the soil or earth on which plant grows. There are three main types of erosion which are:

1. Sheet erosion

2. Gully erosion

3. Rill erosion

Rill erosion occurs when a soil layer is gradually being washed away by narrow stream channels called streamlets on the surface. After a heavy downpour, the streamlets facilitates the movement of water on the ground surface and in turn, earth materials are worn away.

When these streamlets becomes deeper, they form gullies. Gullies results into gully erosion.

When runoff removes soil and loose sediment in thin layers it is called sheet erosion.

Answer:

Tissues form organs, and organs form systems. Hope this helped!

Explanation:

Answer:

+1

Explanation:

To calculate the charge on an ion, we simply use the number of protons and electrons. Protons are the positively charged subatomic particles. The electrons are the negatively charged particles in an atom.

When the number of protons are greater than that of electrons, the ion is positively charged.

When the number of protons are lesser than that of electrons, the ion is negatively charged.

When the number of protons and electrons are equal, the ion is neutral.

Charge = Protons - Electrons = 11 - 10 = +1

The net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons is +1

Protons and electrons are used to determine the net charge on an ion. Protons are positively charged while electrons are negatively charged.

The net charge on an ion is the difference between the number of protons to the number of electrons.

The net charge of an ion = number of protons - number of electrons

The net charge of an ion = 11 - 10 = +1

Hence the net charge of an ion that has 11 protons, 10 electrons, and 12 neutrons is +1

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Answer:

Activation energy

Explanation:

The energy is used to increase the kinetic energy of the molecules to a rate where they can cause successful collisions during the reaction process.

Any reacting particles must be at a certain temperature to cause a successful reaction.

Answer:

(A). It generates genetically different cells.

(B). It generates haploid cells.

(D). It involves two rounds of nuclear division.

Explanation:

Meiosis and mitosis are two types of cell division. Both meiosis and mitotic include four phases, which are prophase, metaphase, anaphase, and telophase.

Mitosis takes place in somatic cells, during which two daughter cells with identical genetic composition as present in parent cell. Mitosis involves one round of nuclear division.

On the other hand, meiosis takes in germ cell, during which four daughter cells with different genetic composition as present in parent cell. It leads to formation of four haploid cells from a diploid parent cell. Meiosis involves two rounds of nuclear division to form haploid cells.

Thus, the correct options are option (A), (B), and (D).

Answer: A  It involves two rounds of nuclear division.

              It generates haploid cells.

              It generates genetically different cells.

Explanation: