an exothermic reaction has group of answer choices a negative dh, absorbs heat from the surroundings, and feels cold to the touch. a negative dh, gives off heat to the surroundings, and feels warm to the touch. a positive dh, gives off heat to the surroundings, and feels warm to the touch. a positive dh, absorbs heat from the surroundings, and feels cold to the touch. a positive dh, absorbs heat from the surroundings, and feels warm to the touch.

Measurement units are the defined units used for the particular dimensions and proportions. 3500 milliseconds are there in seconds.

Time is defined as the rate of things occurring or taking place and is given by seconds, minutes, hours etc.

Using  the conversion factor the relation between the seconds and milliseconds is:

1 second = 1000 miliseconds

Convert 3.5 seconds into milliseconds using conversion factor:

\(\begin{aligned}3.5 \;\rm seconds &= 3.5 \times 1000 \\\\&= 3500 \;\rm miliseconds\end{aligned}\)

Therefore, option C. 3500 milliseconds is correct.

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Answer:

3500 ms

Explanation:

Answer:

0.84 moles of oxygen are required.

Explanation:

Given data:

Mass of CO₂ produced = 37.15 g

Number of moles of oxygen = ?

Solution:

Chemical equation:

C + O₂     →     CO₂

Number of moles of  CO₂:

Number of moles = mass/molar mass

Number of moles = 37.15 g/ 44 g/mol

Number of moles = 0.84 mol

Now we will compare the moles of oxygen and carbon dioxide.

                          CO₂         :       O₂  

                              1           :         1

                            0.84       :       0.84

0.84 moles of oxygen are required.

Answer:

Explanation:

In which step of the four-stroke engine cycle does the car release CO₂, H₂O, and CO?

O C. Exhaust

Answer

Negative 5 and StartFraction 7 over 8 EndFractionfeet

4K+O2-----------2K2O

Due to the lack of supply of energy the methane could not change its phase before 2007.

Even though it has been summer since 2002, the lake didn't dry up until 2007. After 2007, the sun had given out enough energy for the methane molecules' kinetic energy to rise enough to outweigh their attraction to one another. The methane molecules in the lake were gaining kinetic energy at this moment, but the lake was still liquid. The temperature of the molecules remains constant while they melt because the average kinetic energy of the molecules does not vary.

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Answer:

thank you for this oibnki

Answer:

Sure I'll go ahead and like your answers and follow you if that's what you wanted! :)

Explanation:

Answer:

0.25M

Explanation:

acording to M1V1/M2V2=n1/n2

Answer:

⁶³Cu=69.2%

⁶⁵Cu=30.8%

Explanation:

for ⁶³cu

f1=x m1=62.9296

for ⁶⁵cu;

f2=y m2=64.9278

f means fraction of abundance

m means mass

Average atomic mass=63.546

Average atomic mass=f1m1 +f2m2

63.546=x * 62.9296 + y* 64.9278

63.546=62.9296x + 64.9278y.........eqn i

remember x+y =1

x=1-y

insert x into eqn i

63.546=62.9296(1-y) + 64.9278y

63.546= 62.9296-62.9296y+ 64.9278y

63.546-62.9296=64.9278y-62.9296y

0.6164÷1.9982= 1.9982y÷1.9982

y=0.308

recall x=1-y

x=1-0.308

=0.692

Therefore,x=69.2%

y=30.8%

Independent Variable IV is atmospheric temperature, Dependent Variable (DV) are 70°,80°, and 90° , Control Group are  researchers and Constants are humidity and temperature.

Atmospheric temperature is a measurement of temperature at different and various levels of the Earth's atmosphere and above it.

It is effected by many factors, including incoming solar rays, and the humidity and how far from the sea level.

Therefore, Independent Variable IV is atmospheric temperature, Dependent Variable (DV) are 70°,80°, and 90° , Control Group are  researchers and Constants are humidity and temperature.

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One kilogramme of water needs one kilocalorie (kcal) of heat to raise its temperature by one degree Celsius (°C). It takes 4.18 kilocalories of heat to raise the temperature of 1 kilogramme of water by 1 degree Celsius.

As a result of a temperature difference, energy can be transferred from one body to another in the form of heat. It is a cornerstone of thermodynamics and is essential to many organic and synthetic processes. Heat is a form of energy that can be transmitted through radiation, conduction, and convection. Heat is created when particles in matter move about. In daily life, we encounter heat in the form of hot drinks, heated spaces, and warmth from the sun. Heat is employed in industry for a number of processes, including manufacturing, power generation, and cooking. Other scientific fields that depend on heat include physics, chemistry, and engineering.

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The solvent will rise up the plate by capillary action and the sample spots will dissolve and move with the solvent.  total height that the solvent will rise up the plate is 2.2 cm.

The height of the solvent in the developing chamber is 1.2 cm,

the height of the sample spots above the bottom of the plate is 1 cm,

so the total height that the solvent will rise up the plate is 1 + 1.2 = 2.2 cm.

As the solvent moves up the plate by capillary action, the sample spots will dissolve and move with the solvent, separating into individual components based on their solubility and interaction with the solvent. The distance that each component travels can be measured and compared to known standards to identify the components present in the sample.The distance that each sample component travels is dependent on its affinity for the solvent, as well as its molecular size and polarity. The movement of the sample spots on the plate can be used to separate and identify the components.

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CaCl 2(aq)→Ca 2+(aq)+2Cl −(aq) is a dissοciatiοn equatiοn fοr hοw calcium chlοride dissοciates in water.

A chemical reactiοn is the transfοrmatiοn οf οne οr mοre chemicals, knοwn as reactants, intο οne οr mοre new cοmpοunds, knοwn as prοducts. The change in cοncentratiοn οf any οf the reactants οr prοducts per unit οf time can be used tο determine the rate οr speed οf a reactiοn. It is determined by the equatiοn rate=time + cοncentratiοn.

When dissοlved in water, the lattice οf an iοnic crystal disintegrates. When an iοnic sοlid substance dissοlves, dissοciatiοn—the separatiοn οf iοns—οccurs. Iοnic substances that are placed in water will break apart intο a pοsitive iοn and a negative iοn, a prοcess knοwn as electrοlytic dissοciatiοn οr iοnic dissοciatiοn. Iοnizatiοn is a term used tο describe this kind οf dissοciatiοn respοnse. Iοnizatiοn is the name οf the reactiοn, while electrοlytic sοlutiοns are the results.

Therefοre,

CaCl 2(aq)→Ca 2+(aq)+2Cl −(aq) is a dissοciatiοn equatiοn fοr hοw calcium chlοride dissοciates in water.

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Answer:

A and C

Explanation:

When you are cleaning glass you should wear gloves so you don't cut yourself. When you are cleaning blood of a surface you should also wear gloves so that the blood has no way of getting inside of you.

Answer:

A, C,

Explanation:

A, because you can cut your self.

B, because so you dont touch the blood

Answer:

B

Explanation:

This is the First Law of Thermodynamics which states that energy cannot be created or destroyed.

Answer:

animals

Explanation:

I think I remember this from a quiz I took so exotic species

Answer:

See below.

Explanation:

Aqueous copper chloride reacts with sodium hydroxide aqueous solution to give a precipitate (solid) of copper hydroxide and aqueous sodium chloride.

A. Manufacturer's website, B. Chemical supplier or distributor, C. Occupational safety and health administration (OSHA) website, D. Chemical regulatory agencies' websites, E. Workplace safety portals or intranets, F. Online SDS databases, G. Physical copies provided by the manufacturer or supplier.

Manufacturers often provide the SDS for their products on their websites. Chemical suppliers or distributors may also have the SDS available for download or request. Government organizations such as OSHA and chemical regulatory agencies often maintain databases of SDSs that can be accessed online. Workplace safety portals or intranets may provide access to SDSs for employees. Additionally, there are online SDS databases that compile and provide access to a wide range of SDSs. Lastly, physical copies of SDSs may be provided by the manufacturer or supplier, either upon request or included with the shipment of the chemical. In summary, an SDS for a chemical can be found on the manufacturer's website, the website of a chemical supplier or distributor, OSHA and chemical regulatory agencies' websites, workplace safety portals or intranets, online SDS databases, and physical copies provided by the manufacturer or supplier. These sources ensure easy access to crucial safety information regarding the handling and use of chemicals.

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Answer:

I think it might be liquid

Answer: in a molecular molecules move just enough to stay close together but not to stick

Explanation:

Answer:

Lustre is not a property of metal .

Answer:

Done and done

Explanation:

Answer:

the answer is salt because it has a uniform and definite composition

Explanation:

Answer: You add one equivalent of hydride to every one equivalent of each vanillin molecule.

Explanation:

Adding more gas C to the system would shift the equilibrium system to the left.

In a chemical reaction, there is an equilibrium determined by several factors, such as mole concentration, increase or decrease in temperature and addition of mass.

When the amount of reactants is increased, the reaction favors the side of the products and vice versa.

So, to shift the equilibrium to the left, that is, to the reactant side, more of the gas C must be added.

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In order to make 2.3 moles of ammonia, 2.0 moles of nitrogen must react with extra hydrogen.

The mole ratio based on the stoichiometric coefficients can be used to calculate how much hydrogen gas will totally react with nitrogen after we have the balanced chemical equation. In order for hydrogen and nitrogen to totally react, 7.8 moles are required.

The balanced chemical equation for the creation of ammonia by the reaction of nitrogen and hydrogen is:

N2 + 3H2 → 2NH3

As a result, in order to make 2.3 moles of ammonia, we would require:

2 moles of ammonia are produced from 1 mole of nitrogen, 3 moles of hydrogen, and

Alternatively, in the case of moles:

1x + 3(Excess) → 2.3

where x is the necessary number of moles of nitrogen.

Solving for x, we get:

x = (2.3 - 3(Excess))/1

x = 2.3 - 3(Excess)

1 mole of nitrogen is equal to 3 moles of hydrogen.

So we have:

x = 2.3 - 3(Excess)

x = 2.3 - 3(1/3)

x = 2.0

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I have 5 quibs = 7 sleps. Option D.

Most denominations accept baptisms performed by another denomination. In most cases baptism must have been in the name of water and the Trinity. Such converts are usually received through formal ceremonies. This usually includes denominational communion and sometimes confirmation as well.

Transformation is a process, not an event. Conversion is the result of righteous efforts to follow the Savior. These efforts include exercising faith in Jesus Christ repenting of our sins being baptized receiving the gift of the Holy Ghost, and enduring in faith to the end. A company's transformation process includes activities related to transforming resources into goods and services.

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Answer:

Ethanol

Explanation:

All four of these compounds are organic chemicals that occupy the capacity to withhold different intermolecular forces, commonly known as bonds. There are three main types of intermolecular forces, called London Dispersion, dipole dipole, and hydrogen bonding.

Hydrogen bonds are a different kind of dipole dipole bonding that is relatively strong and involves an electronegative atom (only Nitrogen, Oxygen, and Fluorine) causing a force of attraction with a Hydrogen.

Hydrogen bonds are created when there are partial positive charge on the Hydrogen atom, and a partial negative charge on the electronegative atom.

In other words, we are looking for a Hydrogen attached to a Nitrogen, Oxygen, or Fluorine.

◾ Ethanol's structure:                                                 \(\\~~~~~~~H~~~~H\\~~~~~~~~|~~~~~|\\H-C-C-O-H\\~~~~~~~~|~~~~~|\\~~~~~~~H~~~~H\\\)

      → A clear hydroxyl group (O-H) at the right hand side of the Lewis                     structure is shown, which means it possesses a hydrogen bond.

◾ Ethane's structure:                                                         \(\\~~~~~~~H~~~~H\\~~~~~~~~|~~~~~|\\H-C-C-H\\~~~~~~~~|~~~~~|\\~~~~~~~H~~~~H\\\)

      → Does not have any hydrogens attached to the electronegative atoms listed above. Therefore, this does not possess a hydrogen bond.

◾ Dimethyl ether's structure:                                    \(\\~~~~~~~H~~~~~~~~~~H\\~~~~~~~~|~~~~~~~~~~~~|\\H-C-O-C-H\\~~~~~~~~|~~~~~~~~~~~~|\\~~~~~~~H~~~~~~~~~~H\\\)

      → Has the necessary electronegative atom, which is the oxygen, inside the structure. However, it does not obtain any bonding through hydrogens and instead attaches to the carbons, concluding that dimethyl ether does not contain any hydrogen bonding.

◾ Ethylene's structure:                                                                    \(H~~~~H\\~~|~~~~~|\\~C=C\\~~|~~~~~|\\~H~~~H\\\)
      → Clearly not possessing an electronegative atom bonding with a hydrogen, therefore, does not have any hydrogen bonding.  

In summary, the only organic compound that contains a hydrogen bond is ethanol.

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Answer:

factor

Explanation:

Answer:

something pushes or pulls it to a stop.

Answer:

1/32

Explanation:

Answer:

in w

Explanation:

first blood enter renal artery which enter glomerous( where blood is filtrated) and then to Bowman carpusle(take the filtrated blood)

and then to proximal tubular(absorbed salt) and then to loop of hanle (y)(absorb water) and then to distal tubule then to ureter (z) and then to renal vein(x)(to go to urinary bladder)