HELP ME PWhat are the reactants in a chemical reaction?
O A. The ending substances
B. New substances that are formed
O c. All substances that are involved
O D. The starting substances

Answer:

Incandescence is the emission of light caused by high temperature. ... Metals, such as aluminum, magnesium, and titanium, burn very brightly and are useful for increasing the temperature of the firework. Luminescence the emission of light by a substance that has not been heated.

Explanation:

The word incandescence refer to the light produce from heat. When solution is heated it will rise up the light scale through infrared, red and the rest of the color. Fireworks is create by controlling the amount of heat which keep it in one color.

Fireworks are a class of low explosive pyrotechnic device used for aesthetics and entertainment purpose.

They are commonly used in displays, combining a large number of devices in an outdoor setting.

With increase in sound level it can lead to restlessness, temporary or permanent hearing loss, high blood pressure and sleep disturbance.

Fireworks can also cause respiratory problems such as chronic or allergic bronchitis, asthma etc.

Fireworks release a fine cloud of smoke and particulate matter affecting local area quality.

Thus, the word incandescence refer to the light produce from heat. Fireworks is create by controlling the amount of heat which keep it in one color.

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Answer: chemical

Explanation: Chemical changes and physical changes keep it the same.

The Pauli exclusion principle guarantees that no two electrons in the same atom have the same quantum number description. This means that the maximum number of electrons that can be accommodated by any orbital is two.

These are the four groups of quantum numbers:

The electrons ought to be in opposition to one another. If one electron has an upward spin, the other electron in the same orbital should have a downward spin.

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The percent yield of norborneol is approximately 82.2%.

To calculate the percent yield, we use the formula: percent yield = (actual yield / theoretical yield) * 100%.

First, we need to determine the theoretical yield, which is the amount of norborneol that would be produced if the reaction proceeded with 100% efficiency.

The balanced equation for the hydration reaction of norbornene to norborneol is not provided, so we cannot determine the stoichiometry of the reaction.

Assuming the reaction proceeds according to a 1:1 stoichiometry, the theoretical yield of norborneol would be equal to the amount of norbornene used in the reaction (1.245 grams).

Now, we can calculate the percent yield using the actual yield (1.0230 grams) and the theoretical yield (1.245 grams): percent yield = (1.0230 / 1.245) * 100% ≈ 82.2%.

Therefore, the percent yield of norborneol from the hydration reaction is approximately 82.2%.

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Answer: 18

Explanation: thats all

Answer:

Hi! Your answer here is e. 0.018km. The total number of meters Mark ran over the course of three days is 18. The problem asks that we convert this number to kilometers, and 18 meters is equivalent to 0.018 kilometers.

Have a great day! - Mani :)

Answer:

The answer is A

Explanation:

Answer:

B, as height increases gravitational energy increases

Answer:

a subshell is a subdivision of electron shells that are separated by electron orbitals.

Explanation:

(subshells are labeled s,p,d, and f in an electron configuration)

Red gold weighs 9.67 g and has a volume of 0.620 cm3 . gold has a density of 19.3 g/cm3 and copper has a density of 8.96 g/cm3 percentage by mass of each metal in the jewelry is 94,4732031% of gold and 5,5267969% of copper

Here given data is

Red gold weighs = 9.67 g and  volume of gold = 0.620 cm3 and density of gold = 19.3 g/cm3 and density of copper = 8.96 g/cm3

So here we have to calculate percentage by mass = ?

19.3x +  8.96y = 8.62

x + y = 0.475 this is the volume

x = 0,421947674 and y = 0,0530523256

So, 19.3 × 0,421947674 × 100% / 8.62 =  94,4732031% of gold

and 100-94,4732031 = 5,5267969% of copper

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The reaction between AgNO3 and NH3 has the following chemical equation for balance: Ag(NH3)2+ + NO3- from AgNO3 + 2NH3. As a result, the silver-ammonia complex will contain the majority of the silver ions in the equilibrium system.

AgNO3, or silver nitrate, is a chemical that is frequently utilised in a variety of industries, including photography, medicine, and scientific research. It is a white, crystalline solid that dissociates into silver ions and nitrate ions in water. It is also extremely soluble in water. Halide ions in solution are frequently detected using the reagent AgNO3, which reacts with them to produce visually identifiable insoluble silver halides. Additionally employed as an antiseptic in medicine, AgNO3 is applied topically to treat skin diseases including warts and burns. It is also a typical precursor for the creation of additional silver compounds.

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Answer:

Ag(NH3)2+ (aq)

Explanation:

Because Kep3 will equal 1.6 x 10^7

Answer:

lose; positive

Explanation:

34950 J of energy is required to change 75 grams of copper at 35 degrees Celsius to liquid copper at 1200 degrees Celsius.

The specific heat is the amount of heat per unit mass required to raise the temperature by one degree Celsius.

It is a measure of how much energy it takes to raise the temperature of a substance. It is the amount of heat necessary to raise one mass unit of that substance by one temperature unit.

It is given by the formula -

                                                  Q = mcΔT

where, Q = amount of heat

m = mass

c = specific heat

ΔT = Change in temperature

Given,

Mass of copper = 75g

ΔT = ( 1200 - 35) = 1165⁰C

c = 0.4 J/g ⁰C

Q = mcΔT

= 75 × 0.4 × 1165

= 34950 J

Therefore, 34950 J of energy is required to change 75 grams of copper at 35 degrees Celsius to liquid copper at 1200 degrees Celsius.

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The statement is FALSE. Non-ferrous metals can be hardened by heat treatment, although the mechanisms and processes involved may differ from ferrous metals.

Heat treatment techniques such as precipitation hardening can be used to increase the strength of non-ferrous metals. Non-ferrous metals are metals or alloys that do not include iron (or iron allotropes, such as ferrite, etc.) in significant quantities. Non-ferrous metals are employed because they have desired qualities like reduced weight (for example, aluminium), greater conductivity (for example, copper), non-magnetic characteristics, or corrosion resistance (for example, zinc), even though they are often more expensive than ferrous metals. In the iron and steel sectors, several non-ferrous materials are also employed. Bauxite, for instance, is used as a flux in blast furnaces, whereas wolframite, pyrolusite, and chromite are utilised to create ferrous alloys.

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D) There is more NaCl at the start of the ascending limb that decreases as the filtrate moves up the limb.

Filtrate is a liquid that has been passed through a filter or other filtration device. This process is used to separate the solid particles from the liquid, leaving a purified liquid behind.

Explanation: The concentration gradient of NaCl in the medulla is due to the movement of NaCl from the descending limb of the loop of Henle into the ascending limb. As the filtrate moves up the ascending limb, NaCl is actively transported out of the filtrate and into the interstitium of the medulla, thus leading to a decrease in the concentration of NaCl in the filtrate as it moves up the loop. This creates a concentration gradient of NaCl, with higher concentrations near the start of the ascending limb and lower concentrations as the filtrate moves up the loop.

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Answer:

Some humans are randomly immune to malaria or have increased bone density due to random beneficial mutations.

Explanation:

Answer: one that changes the color of a rabbit, allowing it to hide from predators.

Explanation:Hey give me brainliest award need it

Answer: Distance the car has driven

Explanation:

The speed equation is speed=distance/time and since we already know time we need to know distance to solve for speed

Answer: Its c

Explanation: i did it

The volume of the rigid container is approximately 49.7 liters.

To find the volume of the rigid container holding 2.0 mol of gas at a pressure of 1.0 atm and a temperature of 30°C, you can use the Ideal Gas Law equation, which is:

PV = nRT

Where:
P = pressure (in atm)
V = volume (in L)
n = number of moles of gas (in mol)
R = ideal gas constant (0.0821 L⋅atm/mol⋅K)
T = temperature (in Kelvin)

First, convert the temperature from Celsius to Kelvin:
T = 30°C + 273.15 = 303.15 K

Now, plug in the given values into the equation:
(1.0 atm)(V) = (2.0 mol)(0.0821 L⋅atm/mol⋅K)(303.15 K)

To solve for the volume (V), divide both sides of the equation by the pressure (1.0 atm):
V = (2.0 mol)(0.0821 L⋅atm/mol⋅K)(303.15 K) / 1.0 atm

V ≈ 49.7 L

So, the volume of the rigid container is approximately 49.7 liters.

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To convert d-erythrose into d-ribose the reagent is Nitromethane, Sodium borohydride, Sodium periodate, Sodium periodate. The other product formed in this process is 3-amino-2,3-dideoxyketose.

To convert d-erythrose into d-ribose, the reagents required are:

Nitromethane: It reacts with d-erythrose to form a nitroaldol product.

Sodium borohydride: This reduces the nitro group to an amino group.

Sodium periodate: This selectively oxidizes the vicinal diol in the aminoaldose product to form the corresponding dialdehyde.

The reaction pathway can be represented as follows:

d-erythrose -> Nitromethane (in the presence of a base) -> Nitroaldol product -> Sodium borohydride -> Aminoaldose product -> Sodium periodate -> Dialdehyde -> d-ribose.

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Answer:

Mass and charge is conserved

Explanation:

According to the law of conservation of mass, matter is neither created or destroyed. With the exception of nuclear reactions where mass is converted to energy thereby leading to an apparent loss in mass, this law applies to chemical reactions.

A redox reaction is a type of chemical reaction which involves a transfer of electrons. In a redox reaction, the mass of reactant particles is conserved. Also, as electrons are transferred between atoms, one donates and the other accepts. The charge of atoms depends on this gain or loss of electrons. A gain of electrons reduced the charge of an atom whereas a loss of electrons increases the charge. This two processes occur concurrently, therefore, charge is also conserved.

Answer:

The answer is

Explanation:

The mass of a substance when given the density and volume can be found by using the formula

From the question

volume of silver = 0.25 cm³

density = 10.5 g/cm³

The mass is

mass = 10.5 × 0.25 = 2.625

We have the final answer as

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The rate at which the tank is filled in gallons per second is 3 gallons per minute.

In this question, we are supposed to calculate the rate at which the tank is filled in gallons per second and cubic meters per second. Additionally, we also need to determine the time interval required to fill a 1.00−m3 volume at the same rate.

A) The time required to fill the tank is 5.00 min and the tank is 15.0-gallon. Therefore, the rate at which the tank is filled in gallons per second is given by;

Rate = 15.0 gal / 5.00 min

= 3 gal / min.

Now, to calculate the rate at which the tank is filled in cubic meters per second, we first convert the gallons to cubic inches, then to cubic meters.

B) 1 US gallon = 231 cubic inches, and 1 cubic inch = 0.0254 m³

Therefore, the rate at which the tank is filled in cubic meters per second is;

Rate = (3 gal/min) * (231 in³/gal) * (0.0254 m/in)³ = 0.00794 m³/s

C) To determine the time interval required to fill a 1.00−m3 volume at the same rate, we can use the rate calculated in part (b). Thus,

Time = (Volume) / (Rate)

= 1.00 m³ / 0.00794 m³/s

= 125.7 s = 2.09 hr

Thus, the rate at which the tank is filled in gallons per second is 3 gallons per minute, the rate at which the tank is filled in cubic meters per second is 0.00794 m³/s, and the time interval required to fill a 1.00−m3 volume at the same rate is 2.09 hours.

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Answer:

Endothermic reactions absorb energy

Explanation:

Answer:

Energy (Heat energy) is absorbed from the surroundings

Explanation:

When the total heat content of the products is more than the reactants, heat energy must be absorbed from the surroundings for the reaction to proceed . such reaction is said to be endothermic

The mass flow rate of air through the pipe is approximately 458 gph (grams per hour).

To calculate the mass flow rate of air through the pipe, we can use the following formula:

Mass flow rate = Density × Velocity × Area

First, let's convert the diameter from inches to feet:

Diameter = 5.6 inches = 5.6/12 feet = 0.4667 feet

Next, we need to calculate the area of the pipe:

\(Area = \pi * (Diameter/2)^2 = \pi * (0.4667/2)^2 = 0.1707 ft^2\)

Now, let's convert the velocity from miles per hour (mph) to feet per minute (ft/min):

Velocity = 6.5 mph = 6.5 × 5280 ft/60 min = 570 ft/min

The given air density at 12,500 ft on a standard day is approximately 0.002376 slugs/\(ft^{3}\).

Now, we can calculate the mass flow rate:

Mass flow rate = Density × Velocity × Area

\(= 0.002376 slugs/ft^3 * 570 ft/min * 0.1707 ft^2\\ = 0.0458 slugs/min\)

To convert the mass flow rate to ten thousandths, we multiply by 10,000:

Mass flow rate (ten thousandths) = 0.0458 slugs/min × 10,000

= 458 gph (grams per hour)

Therefore, the mass flow rate of air through the pipe is approximately 458 gph (grams per hour).

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Answer:

32°F

Explanation:

because lower then that it won't but 32°F and over will melt a solid

Answer:

Generally, all atoms of elements contain three sub-atomic particles- Protons(Positively-charged), Neutrons(Neutral) and Electrons(Negatively-charged).

The Magnitude of the Positive Charge possessed by the Protons and the Magnitude of the Negative Charge possessed by the Electrons cancel each other, which make the atom electrically neutral.

Hence,

Without any electrons, the magnitude of the positive and negative charges wouldn't balance, and the atom would be unstable and disintegrate almost immediately. Hence, all stable atoms should have electrons revolving around them, where the number of protons and electrons are the same, under normal conditions.

To Conclude,

Every atom of an element will have electrons arranged in different shells, or matter couldn't exist without electrons.