Which of the following BEST describes how these elements would be classified?

A.
Element Q is a nonmetal and element R is a nonmetal.

B.
Element Q is a metal and element R is a metalloid.

C.
Element Q is a nonmetal and element R is a noble gas.

D.
Element Q is a metal and element R is a noble gas.

The velocity of the water with an earlier velocity of 8 m/s will be 24 m/s in the small tube with an area of 4 cm², option C.

This is a problem involving the conservation of mass and the principle of continuity in fluid mechanics. According to the principle of continuity, the mass of a fluid flowing through any given section of a pipe must remain constant.

Using the given equation A₁v₁ = A₂v₂

A₁v₁ = A₂v₂

(12 cm²) (8 m/s) = (4 cm²) (v₂)

v₂ = (12 cm²) (8 m/s) / (4 cm²)

v₂ = 24 m/s.

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Answer:

Acid :

1) they are sour in taste

2) if we put litmus paper in an acid they turn blue litmus to red and ( red litmus paper colour doesn't change )

3) acids use to react with metals

4) it releases hydrogen (H+) when dissolved in water

5) example : Hydrochloric acid , sulphuric acid , nitric acid etc..

base :

1) they are bitter in taste

2) and the red litmus paper trunes to blue and ( red litmus paper colour doesn't change )

3) it doesn't react with metals

4) it releases hydroxide (OH+) when dissolved in water

5 example : sodium hydroxide, potassium hydroxide etc...

Answer: 6.02 × 10^24

Explanation:

The statement that is true about magnets is ''Similar poles of a magnet repel each other.''

All magnets have both north and south poles. Opposite poles attract each other, whereas the similar poles repel each other. When you rub a piece of iron along a magnet, this force creates a magnetic field.

So we can conclude that The statement that is true about magnets is ''Similar poles of a magnet repel each other.''

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Answer:

i

Explanation:

Answer:1

Explanation:v

Answer:

157 g of MgO

Explanation:

the reaction:

2Mg + O2 ➡️ 2MgO

1) find the mol of Mg

mol = mass / molar mass

mass = 94.2 g

molar mass = 24

mol = 94.2 / 24

mol = 3.925 mol

2 mol = 3.925 moles

2) find mass of MgO

mass = mol × molar mass

mol = 3.925

molar mass = 24+16 = 40

mass = 3.925 × 40

= 157 g

Taking into account the reaction stoichiometry, 2.713 grams of aspirin are formed when 2.08 grams of salicyclic acid reacts.

In first place, the balanced reaction is:

C₄H₆O₃ + C₇H₆O₃ (Salicyclic Acid) →C₉H₈O₄ (aspirin) + C₂H₄O₂

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The following rule of three can be applied: if by reaction stoichiometry 138 grams of salicyclic acid form 180 grams of aspirin, 2.08 grams of salicyclic acid form how much mass of aspirin?

\(mass of aspirin=\frac{2.08 grams of salicyclic acidx 180 grams of aspirin}{138 grams of salicyclic acid}\)

mass of aspirin= 2.713 grams

Then, 2.713 grams of aspirin are formed when 2.08 grams of salicyclic acid reacts.

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The final temperature at equilibrium will be approximately 26.525 °C.

To find the final temperature at equilibrium, we can use the equation:

Q = m * c * ΔT

Where:

Q = heat energy absorbed or released

m = mass of the substance

c = specific heat capacity of the substance

ΔT = change in temperature

In this case, 800 J of heat is absorbed by 120 g of water at 25 °C. We need to find the final temperature at equilibrium.

Using the equation for water:

Q_water = m_water * c_water * ΔT_water

Rearranging the equation, we can solve for the change in temperature (ΔT_water):

ΔT_water = Q_water / (m_water * c_water)

Substituting the given values:

ΔT_water = 800 J / (120 g * 4.18 J/g°C)

Calculating:

ΔT_water ≈ 1.525 °C

To find the final temperature at equilibrium, we add the change in temperature to the initial temperature:

Final temperature = 25 °C + 1.525 °C

Final temperature ≈ 26.525 °C

Therefore, the final temperature at equilibrium will be approximately 26.525 °C.

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Explanation:

elements are carbons and hydrogen

Answer:

Carbon and Hydrogen.

Explanation:

It’s in the name Hydro (H) Carbon (C)

Answer:

A

Explanation:

Answer:

True

Explanation:

The specific heat capacity of any substance is defined as the amount of heat required to raise the temperature of a body by 1°C.

Hence, if the same magnitude of thermal energy is supplied to two objects of which one has a high specific heat capacity and the other has a low specific heat capacity, the object having a high specific heat capacity will have its temperature raised far more than the object with low specific heat capacity.

Approximately 60.9% of the total energy in 2005 came from fuels that emitted greenhouse gases. This signifies a significant contribution to global greenhouse gas emissions and highlights the importance of transitioning to cleaner and more sustainable energy sources to mitigate climate change impacts.

To determine the total percent of energy that came from fuels emitting greenhouse gases, we need to consider the energy sources listed in the chart that are known to produce greenhouse gas emissions. In this case, those would be oil, natural gas, and coal.

From the chart, we see that the percentages for these three energy sources are:

Oil: 37.9%

Natural gas: 23%

Coal: Not specified

Although the percentage for coal is not mentioned in the given information, it is a known fact that coal combustion releases greenhouse gases, including carbon dioxide (CO2). Therefore, we can assume that coal is among the fuels emitting greenhouse gases.

Adding up the percentages for oil and natural gas, we have:

37.9% (oil) + 23% (natural gas) = 60.9%

Therefore, approximately 60.9% of the total energy in 2005 came from fuels that emitted greenhouse gases. This signifies a significant contribution to global greenhouse gas emissions and highlights the importance of transitioning to cleaner and more sustainable energy sources to mitigate climate change impacts.

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The factor that  doesn’t change the resistance of a wire is pressure. option A.

Resistance is a conductor's capacity to thwart the passage of current. It is controlled by the interplay of the applied voltage and the electric current passing through it. The amount of opposition any object applies to the flow of electric current is referred to as resistance.

The ohm, a unit of measurement for resistance, is represented by the Greek letter omega. According to Ohm's law, the voltage across two places is precisely proportional to the current flowing through a conductor between them.

Hence option A is correct.

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missing part;

The pressure

The length of the resistor.

The thickness of the resistor.

The temperature of the conductor.

Taking into account the reaction stoichiometry, 4.515 grams of N₂ can be produced from 8.73 grams of H₂O₂ and 5.16 grams of N₂H₄.

In first place, the balanced reaction is:

N₂H₄ + 2 H₂O₂ → N₂ + 4 H₂O

By reaction stoichiometry (that is, the relationship between the amount of reagents and products in a chemical reaction), the following amounts of moles of each compound participate in the reaction:

The molar mass of the compounds is:

Then, by reaction stoichiometry, the following mass quantities of each compound participate in the reaction:

The limiting reagent is one that is consumed first in its entirety, determining the amount of product in the reaction. When the limiting reagent is finished, the chemical reaction will stop.

To determine the limiting reagent, it is possible to use a simple rule of three as follows: if by stoichiometry 34 grams of H₂O₂ reacts with 32 grams of N₂H₄, 8.73 grams of H₂O₂ reacts with how much mass of N₂H₄?

\(mass of N_{2} H_{4} =\frac{8.73 grams of H_{2} O_{2}x 32 grams of N_{2} H_{4} }{34grams of H_{2} O_{2}}\)

mass of N₂H₄= 8.22 grams

But 8.22 grams of N₂H₄ are not available, 5.16 grams are available. Since you have less mass than you need to react with 8.73 grams of H₂O₂, N₂H₄ will be the limiting reagent.

Considering the limiting reagent, the following rule of three can be applied: if by reaction stoichiometry 32 grams of N₂H₄ form 28 grams of N₂, 5.16 grams of N₂H₄ form how much mass of N₂?

\(mass of N_{2} =\frac{5.16 grams of N_{2} H_{4} x28 grams of N_{2}}{32 grams of N_{2} H_{4} }\)

mass of N₂= 4.515 grams

Then, 4.515 grams of N₂ can be produced from 8.73 grams of H₂O₂ and 5.16 grams of N₂H₄.

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Answer:

It will take 19.9 hours to fill the cubic.

Explanation:

First, we can find the volume of the cubic.

\(V_{c}=18.7^{3}ft^{3}=6539.2 ft^{3}=1.85*10^{8} ml\)

Let's multiple this volume times the density

\(V_{c}*\rho=1.85*10^{8} ml * 1.49 g/ml = 2.76*10^{8} g\)

If we divide the spilling rate by V times density we will have:

\(t=\frac{V_{c}}{\rho R}=2.76*10^{5} kg/3.85kg/s=71688.3 s = 19.9 h\)

Therefore, it will take 19.9 hours to fill the cubic.

I hope it helps you!            

The study of chemicals and bonds is called chemistry. when the amount reactant and the product is equal is said to be equilibrium.

The correct answer is 19.9h.

The formula used to solve the question is as follows:-

\(D= \frac{M}{V}\)

The data is given as follows:-

The density of the is as follows:-

\(V*D =1.85*10^8 *1.49 =2.76*10^8\)

Hence, the time will be as follows:-

\(t=\frac{V_c}{Dr}\\ \\=\frac{2.76*10^5}{3.85} \\ = 71688.3s\\=19.9h\)

Hence, the correct time is 19.9h.

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Answer:

b or c

Explanation:

Answer:

Explanation:

The tank design of the truck is useful for transporting gas because it is able to hold large volumes of gas while taking up minimal space. The container is typically long and cylindrical in shape, allowing the gas to be compressed and stored in a smaller space.

If the truck were carrying a liquid, the container would likely be designed differently. Liquids take the shape of their container, so the container would need to be able to hold the liquid in an upright position without spilling. This could be achieved through the use of a tank with a closed top and a small opening at the bottom for dispensing the liquid.

For a solid, the container would also need to be designed differently. Solids have a fixed shape and volume, so the container would need to be able to hold the solid without crushing or altering its shape. This could be achieved through the use of a container with walls that are thick and sturdy enough to support the weight of the solid.

Answer:

Since human wants are unlimited, and resources used to satisfy those wants are limited - there is scarcity. Even in the US, one of the richest countries in the world, there is scarcity -- if we use our new definition of SCARCITY.

hope it helps

Strong bonds between the atoms are shown by the high melting and boiling temperatures of metals.

The coordination number for each atom is either eight or twelve, and metallic solids contain metal atoms arranged in face-centered or body-centered patterns. The difficulty is that the bonding is too strong for London Dispersion forces, in addition to the fact that there are insufficient electrons to form covalent bonds. The problem is solved by the fact that the nuclei of the metals float in a sea of electrons. Metals transmit electricity because the electrons are mobile and delocalized.

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Answer:

I. dipole-dipole

III. dispersion

IV. hydrogen bonding

Explanation:

Intermolecular forces are weak attraction force joining nonpolar and polar molecules together.

London Dispersion Forces are weak attraction force joining non-polar and polar molecules together. e.g O₂, H₂,N₂,Cl₂ and noble gases. The attractions here can be attributed to the fact that a non -polar molecule sometimes becomes polar because the constant motion of its electrons may lead to an uneven charge distribution at an instant.

Dispersion forces are the weakest of all electrical forces that act between atoms and molecules. The force is responsible for liquefaction or solidification of non-polar substances such as noble gas an halogen at low temperatures.

Dipole-Dipole Attractions are forces of attraction existing between polar molecules ( unsymmetrical molecules) i.e molecules that have permanent dipoles such as HCl, CH3NH2 . Such molecules line up such that the positive pole of one molecule attracts the negative pole of another.

Dipole - Dipole attractions are more stronger than the London dispersion forces but weaker than the attraction between full charges carried by ions in ionic crystal lattice.

Hydrogen Bonding is a dipole-dipole intermolecular attraction which occurs when hydrogen is covalently bonded to highly electronegative elements such as nitrogen, oxygen or fluorine. The highly electronegative elements have very strong affinity for electrons. Hence, they attracts the shared pair of electrons in the covalent bonds towards themselves, leaving a partial positive charge on the hydrogen atom and a partial negative charge on the electronegative atom ( nitrogen in the case of CH3NH2 ) . This attractive force is know as hydrogen bonding.

Answer:

The intermolecular forces present in CH_3NH_2 includes

Explanation:

The intermolecular forces present in CH_3NH_2 includes II. (ion-dipole) and IV. (hydrogen bonding)

It is a polar molecule due to NH polar bond and it can form Hydrogen bond also due to NH bond.

Interaction will be dipole- dipole and Hydrogen dispersion forces can always be taken into account.

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Answer:

A green liquid becoming a red liquid.

Explanation:

If the color change is unexpected it is a chemical change.

(If 2 clear liquids make a black, red, green, ect color it is a chemical change)

no normal color mix makes green turn red.

Answer:

a. 473mL.

b. 79.38kg

c. 24.47lb of fat

d. 42.5g of N.

Explanation:

a. A qt is equal to 946mL. 0.500qt are:

0.500qt * (946mL / 1qt) = 473mL

b. 1lb is equal to 0.4536kg, 175lb are:

175lb *(0.4536kg / 1lb) = 79.38kg

c. The fat in kg of the athlete is:

74kg * 15% = 11.1kg of fat. In pounds:

11.1kg * (1lb / 0.4536kg) = 24.47lb of fat

d. The mass of nitrogen in the fertilizer is:

10.0oz * 15% = 1.5oz of N

1 oz is equal to 28.35g. 1.5oz are:

1.5oz * (28.35g / 1oz) = 42.5g of N

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:

Their moms and dads. ;)

Explanation:

We can determine the relative atomic ratios in a compound using an empirical formula.

The complete question is,

How does the empirical formula inform us?

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