Sample Response: Forces are either positive or negative vectors, depending on the direction in which the force is acting. The net force is the sum of all of the forces acting on an object. If the children pull on the toy with the same force in opposite directions, the forces will be perfectly balanced and cancel out, leaving a net force of zero.

What did you include in your response? Check all that apply.

Forces are vectors.
Forces can be positive or negative.
The forces exerted by the children are in balance.
The net force is the sum of all of the forces that canceled out to zero.

Answer:

Hollow bones allow the birds to fly. They're quite dense, and that density allows for flight! Because we humans do not have hollow bones, our bodies are much too heavy to fly on our own. If we did, we'd probably be able to fly.

Explanation:

Experience refers to something that happens in a person's life that leaves an indelible mark on the person.

The term experience refers to something that happens in a person's life that leaves an indelible mark on the person.

The following are experiences;

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Answer:

Experience refers to something that happens in a person's life that leaves an indelible mark on the person.

What is an experience?

The term experience refers to something that happens in a person's life that leaves an indelible mark on the person.

The following are experiences;

Daryl has visited many other countries.

Alfonso has developed many strong friendships

Marion has worked at jobs that improved his time-management skills.

Explanation:

[tex]\text{Given that,}\\\\\text{Pressure,}~ P = 1.99~ \text{atm}\\ \\\text{No. of moles,}~ n = 0.182~ \text{mol.}\\\\\text{Temperature,}~ T = 83.4^{\circ}~ C = 356.4~K\\\\ \text{Molar gas constant,}~ R = 0.082~ \text{L}~ \text{atm}~ \text{mol}^{-1}~ \text{K}^{-1}\\\\\text{Volume,}~ V =?\\\\\text{We know that,}~\\\\~~~~~~~PV =nRT\\\\\implies V = \dfrac{nRT}{P}\\\\\\~~~~~~~~~~=\dfrac{0.182 \times0.082 \times 356.4 }{1.99}\\\\\\~~~~~~~~~~\approx 2.68~ \text{L.}\\\\\\[/tex]

[tex]\text{Hence the volume of the gas is 2.68 L.}[/tex]

2.68L is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4°C.

A measurement of three-dimensional space is volume. It is frequently expressed quantitatively using SI-derived units, as well as several imperial or US-standard units. Volume and the notion of length are connected. In contrast to how much space the container actually occupies, the size of a container is typically thought of as its capacity, or the quantity of liquid it could hold.

Volume was initially measured using naturally occurring vessels of a comparable shape and then with standardised containers. Arithmetic formulas can be used to quickly calculate the volume of several straightforward three-dimensional shapes. If a formula again for shape's boundary is known, it is possible to use integral calculus to determine the volumes of more complex shapes.

P×V = n×R×T  

V=n×R×T /P

=0.182 ×0.082×356.4 /1.99

=2.68L

Therefore, 2.68L is the volume of a gas if 0.182 moles of the gas is at 1.99 atm and 83.4°C.

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An aqueous solution of an arrhenius acid reacts with an aqueous solution of an arrhenius base to produce water and salt.

This is a compound which is formed as a result of a neutralization reaction between acid and base.

Arrhenius acid reacts with an aqueous solution of an arrhenius base to produce water and salt due to increased concentration of H+ and OH- respectively.

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Answer:

The correct answer is A, or "so they can effectively communicate their findings.

Explanation:

The metric system is the international system of weights and measures, which is used universally in the scientific community. Scientists benefit from the metric system so that they can communicate theories, ideas and most importantly data in a way everyone understands. It is virtually impossible to comprehend any modern, data-rich research in the natural or physical sciences without referring to the metric system and being able to contextualize the numbers and units it includes.

Please brainliest answer

I appreciate it :)

6.6ml will be the new volume if the pressure increases to 4 atm and the temperature are lowered to 200 K.

The ideal gas law (PV = nRT) relates the macroscopic properties of ideal gases. An ideal gas is a gas in which the particles (a) do not attract or repel one another and (b) take up no space (have no volume).

Given data:

[tex]V_1=20 ml[/tex]

[tex]T_1=3[/tex]

[tex]P_1=2 atm[/tex]

[tex]T_2=200 K[/tex]

[tex]P_2=4 atm[/tex]

[tex]V_2=?[/tex]

Using equation:

[tex]V_2 =[/tex] [tex]\frac{P_1 X V_1 XT_2}{P_2 X T_1}[/tex]

[tex]V_2 =[/tex][tex]\frac{2 atm X 20 ml X200 K}{4 atm X 300 K}[/tex]

[tex]V_2 = 6.6 ml[/tex]

Hence, 6.6ml will be the new volume if the pressure increases to 4 atm and the temperature are lowered to 200 K.

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Answer:

Q1. False

Q2. True

Explanation:

gas molecules are not that at far than dimensions molecules

Answer:

1.b

2.b

3.a

4.a

Explanation:

use the rate laws when answering this.

Answer:

Energy can neither be created nor destroyed, but it does change its form. And not all forms of energy are usable and it gets dissipated as heat energy and sound energy. The energy that is wasted cannot be recovered.

the answer would be B an atom that has lost an electron

The gas molecules move between the system and the surroundings follow PV=nRT.

The smallest particle of a substance has all of the physical and chemical properties of that substance.

An increase in pressure pushes the molecules closer together, reducing the volume. If the pressure is decreased, the gases are free to move about in a larger volume.

In the kinetic theory of gasses, increasing the temperature of a gas increases in average kinetic energy of the molecules, causing increased motion.

The reduction in the volume of the gas means that the molecules are striking the walls more often increasing the pressure, and conversely if the volume increases the distance the molecules must travel to strike the walls increases and they hit the walls less often thus decreasing the pressure.

At constant temperature and pressure the volume of a gas is directly proportional to the number of moles of gas. At constant temperature and volume the pressure of a gas is directly proportional to the number of moles of gas.

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Electrical engineers are the scientists that study the production of electricity more efficient.

Electrical engineers are the type of scientist that would most likely study how electricity could be produced more efficiently because they produced new technologies which are cost efficient as well as produce high amount of electricity.

So we can conclude that electrical engineers are the scientists that study the production of electricity more efficient.

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Answer:

x²+6x+5=0

On comparing with the equation

ax² + bx + c = 0

a=1, b = 6 and c = 5

Now

b²– 4ac = 6² – 4 x 1 x 5 = 36 - 20 = 16

[tex]x = \frac{ - b \:± \: \sqrt{b {}^{2} - 4ac } }{2a} \\ \\ x = \frac{ - 6\:± \: \sqrt{16 } }{2 \times 1} \\ \\ x = \frac{ - 6± {4} }{2} \\ \\ x = \frac{ - 6 + {4} }{2} \: \: or \: \: x = \frac{ - 6 - {4} }{2} \\ \\ \implies \: x = \frac{ \cancel-2 }{ \cancel2}^{-1 }\: \: or \: \: x = \frac{ \cancel-10 }{ \cancel2}^{-5}\\ \\ \implies \: { \blue{\fbox{ \: x = - 1 \: \: \: or \: \: \:x = - 5}}}[/tex]

[tex] {x}^{2} + 6x + 5 = 0 \\ \\ {x}^{2} + 5x + x + 5 = 0 \\ \\ x(x + 5) + 1(x + 5) = 0 \\ \\ (x + 1)(x + 5) = 0.[/tex]

[tex]x = - 1 \\ x = - 5.[/tex]

Answer:

When pressure increases, density increases.

When the pressure decreases, density decreases.

When density increases, pressure increases.

When density decreases, the pressure decreases.

Explanation:

Answer:

Coating a material with metal

(SInce the glasses will be coated with gold.)

Answer:

1.3 M

Explanation:

The formula mass of lithium fluoride is 7+19=26 g/mol. This means that in 52 grams of LiF, there is 2 moles.

Molarity = (moles of solute)/(liters of solution), so the answer is 2/1.5 = 1.3 M

The equation for this reaction is

[tex]\text{Mg}+\text{O} \longrightarrow \text{MgO}[/tex]

This means that for every mole of magnesium consumed, 1 mole of magnesium oxide is produced.

So, the answer is 0.094 moles.

Answer:

D

Explanation:

There are 2 oxygens on the reactants side (OH)2 but 4 on the products side (2H2O). You cannot get 2 oxygens out of nowhere, so it is not balanced.

Explanation:

the answer for the above

is b)0.019

Answer:

you will not

Explanation:

the little subscript number just indicates how many of a certain atom is in a molecule... example H₂O... that little ₂ means that there are 2 hydrogen atoms in the water molecule.

there is an invisible ₁ on the O as well. H₂O₁ shows there is one oxygen atom in the water molecule, but we do not show the 1

Answer:

The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound. When balancing an equation, you can change the coefficients but not the subscripts.

Answer:

Out of the above mixtures, seawater, air, and soda water are solutions.

hope this helps :3

The maximum volume of hydrogen evolved at room temperature and prressure after taking excess zinc with 0.01 mol HCl is 2.4 [tex]dm^{3}[/tex]

hence correct option is (C)

According to this law, the product of the pressure and the volume of one gram molecule of an ideal gas is equal to the product of the absolute temperature of the gas and the universal gas constant.

Given Equation ;

Zn + 2HCl --> [tex]ZNCl_2[/tex] + [tex]H_2[/tex]

Given Quantities ;

Amount of Zinc = Excess

Amount of 1.0 mol/ltr HCl = 100 ml

It means, Number of moles of H = 0.1 mole

Temperature = 298 K

Pressure = 1 Atm

This is a “single state” problem, so we can solve it using the ideal gas law, PV = nRT.

therefore, using Ideal gas equation ;

PV=nRT

1 x V = 0.1 x 0.0821 x 298

volume of hydrogen gas = 2.4 litre ie, 2.4 [tex]dm^{3}[/tex]

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An atom has eight protons and nine neutrons. The atomic structure of the atom is attached below in image.

The term "atomic structure" describes the structure of an atom, which has a nucleus that contains both protons and neutrons . The centre of the nucleus is circled by the negatively charged electrons.

The smallest piece of ordinary matter within an element is called an atom. Protons, neutrons, and electrons are the three subatomic particle types that make up an atom.

An isotope's number is equal to the sum of its protons plus neutrons since their masses are almost identical. Oxygen 16 therefore has 8 protons and 8 neutrons, followed by oxygen 17 with 8 protons and 9 neutrons, and oxygen 18 with 8 protons and 10 neutrons.

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If [tex]Ca(OH)_2[/tex] completely dissociates in water, it means it is a dilute strong base.

A base is a substance that can neutralize the acid by reacting with hydrogen ions.

An acid is a substance that donates hydrogen ions and a base is a substance that accepts hydrogen ions.

Ca(OH)₂ does not have hydrogen ions to donate, but it can accept hydrogen ions to form H₂O according to this equation:

H⁺ + OH⁻ → H₂O.

Hence,  Ca(OH)₂ is a base.

A strong base is a base that dissociates completely into metallic and hydroxide ions in aqueous solutions, while a weak base dissociates partially.

Hence, Ca(OH)₂ is a strong base.

Dilute refers to a solution meaning that the substance is not pure and the concentration is low. Since the solution the Ca(OH)₂ is 0.02 M means that it is diluted.

Therefore, we have found that the description of 0.02 M Ca(OH)₂ is a dilute strong base.

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The energy carried by the waves depends on the amplitude of the wave. If the amplitude is doubled then the energy gets increased by four times.

The amplitude of a wave is the distance from the center line to the trough or the crest of the wave. The energy of the wave is directly proportional to the square of the amplitude.

E  ∝ A²

So if the amplitude is doubled then E = 4. Hence, the energy gets increased quadruples times. The energy is related to the frequency and the wavelength of the wave that travels.

Therefore, the energy gets increased by four times if the amplitude is doubled.

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The energy transferred is given as the product of power and time. The 1.4 kW kettle with boiled water produces 378 kJ of energy.

Energy is the quantitative property that determines the work done by the body in the form of heat and light.

The image showing the kettles with time and power is attached below.

Given,

Power of the kettle = 1.4 kW

Time taken = 4.5 minutes

If power = energy ÷ time

Then, energy = power × time

= 1.4 × 0.075

= 0.105 KWh

Therefore, 0.105 kWh or 378KJ is the energy transferred.

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5mol produces -10.941KJ

4 mol let produces x KJ

Solve through proportion

5moles of octane produces -10941KJ

1mol of octane produces 2188KJ

4mol of octane produces

Answer:

Gas tests include:

hydrogen - lighted splint goes out with a squeaky pop.

Explanation:

Digging of wells being able to increase aquifer is something I agree with.

This is a water permeable rock layer which is found in the underground layer of the earth.

Wells will ensure water seeps into these layers thereby bringing about an increase in the aquifer.

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Taking into account the definition of calorimetry, the mass of water is 35.70 grams.

Calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.

Sensible heat is defined as the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).

So, the equation that allows to calculate heat exchanges is:

Q = c× m× ΔT

where:

In this case, you know:

For granite:

For water:

Replacing in the expression to calculate heat exchanges:

For gold: Qgranite= 0.795 [tex]\frac{J}{gC}[/tex]  × 126.1 g× (51.9 °C - 92.6 °C)

For water: Qwater= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)

If two isolated bodies or systems exchange energy in the form of heat, the quantity received by one of them is equal to the quantity transferred by the other body. That is, the total energy exchanged remains constant, it is conserved.

Then, the heat that the gold gives up will be equal to the heat that the water receives. Therefore:

- Qgranite = + Qwater

- 0.795 [tex]\frac{J}{gC}[/tex]  × 126.1 g× (51.9 °C - 92.6 °C)= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× (51.9 °C - 24.7 °C)

Solving:

4,080.15465 J= 4.186 [tex]\frac{J}{gC}[/tex]× mass of water× 27.3 °C

4,080.15465 J= 114.2778 [tex]\frac{J}{g}[/tex]× mass of water

mass of water= (4,080.15465 J)÷ 114.2778 [tex]\frac{J}{g}[/tex]

mass of water= 35.70 grams

Finally, the mass of water is 35.70 grams.

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