Which of the following is the correct Lewis Dot Structure for N2?
PHOTO ABOVE

please help I got it wrong so is not D

Answer:

A. cutting a substance into four pieces

Explanation:

The others include burning, reacting, and rust which make up a chemical change.

Cutting a substance into four pieces indicates a physical change. The correct option is A.

Even before to and after a physical change, the material implicated is unique architectural the same.

Physical changes include texture, shape, heat, and the beginning of a change in the state of matter. The texture of a substance influences how it feels.

A physical change is simply a change in appearance. The situation has not changed since the change.

Physical change can be seen in the use of cutting paper, melting butter, dissolving salt in water, and breaking glass.

Chemical reaction takes place when bonds among molecules or atoms are broken or formed.

This implies that one material with a specific set of properties is transformed into another substance with a different set of properties.

Thus, the correct option is A.

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Answer:

Over the past few decades, humans have released so many different chemicals into the air that they have changed the mix of gases in the atmosphere. ... In addition, the exhaust from cars, trucks, and buses releases nitrogen oxides and sulfur dioxide into the air.

Answer:

Scientific theories are testable and make falsifiable predictions. They describe the causes of a particular natural phenomenon and are used to explain and predict aspects of the physical universe or specific areas of inquiry (for example, electricity, chemistry, and astronomy).

A good theory in the theoretical sense is (1) consistent with empirical observations; is (2) precise, (3) parsimonious, (4) explanatorily broad, and (5) falsifiable; and (6) promotes scientific progress (among others; Table 1.1).

Answer:

a) [tex]BaF_{2}[/tex]

b) [tex]SnCl_{4}[/tex]

c) [tex]Cr_{2}O_{3}[/tex]

d) [tex]FeO[/tex]

e) [tex]Li_{3} P[/tex]

Explanation:

The charges of the ions have to be 0, so they balance.

a) [tex]Ba^{2+}[/tex] has the charge of +2 and [tex]F^{-}[/tex] has the charge of -1. So its [tex]0=(+2)+(-1)*2[/tex]. That means you need one [tex]Ba^{2+}[/tex] and two [tex]F^{-}[/tex] to balance the equation. -> [tex]BaF_{2}[/tex]

b) [tex]Sn^{4+}[/tex] has the charge of +4 and [tex]Cl^{-}[/tex] has the charge of -1. So its [tex]0=(+4)+(-1)*4[/tex]. That means you need one [tex]Sn^{4+}[/tex] and four [tex]Cl^{-}[/tex] to balance the equation. -> [tex]SnCl_{4}[/tex]

c) [tex]Cr^{3+}[/tex] has the charge of +3 and [tex]O^{2-}[/tex] has the charge of -2. So its [tex]0=(+3)*2+(-2)*3[/tex]. That means you need two [tex]Cr^{3+}[/tex] and three [tex]O^{2-}[/tex] to balance the equation. -> [tex]Cr_{2}O_{3}[/tex]

d) [tex]Fe^{2+}[/tex] has the charge of +2 and [tex]O^{2-}[/tex]has the charge of -2. So its [tex]0=(+2)+(-2)[/tex]. That means you need one [tex]Fe^{2+}[/tex] and one [tex]O^{2-}[/tex] to balance the equation. -> [tex]FeO[/tex]

e) [tex]Li^{+}[/tex] has the charge of +1 and [tex]P^{3-}[/tex]has the charge of -3. So its [tex]0=(+1)*3+(-3)[/tex]. That means you need three [tex]Li^{+}[/tex] and one [tex]P^{3-}[/tex] to balance the equation. -> [tex]Li_{3} P[/tex]

Answer:

Megan trailer said pass the maga mic so I can sing, I'll call the mic magnesium

Explanation:

Get it cuz a mic is made out of magnesium

Answer:in can

Explanation:

Answer:

What are your subjects you need help with?

Answer:

both conserve mass

Explanation:

Answer:

B.both conserve mass.

Answer:

Chemical would be water splitting into just hydrogen and oxygen. Where as a physical change would be if it turned to ice.

Explanation:

Answer:

Each atom is left with a complete outer shell. An ionic bond forms between a metal ion with a positive charge and a nonmetal ion with a negative charge.

HOPE DAT HELPS BRO!

Answer: When you turn a light on it becomes bright :)

In electrical wiring, a light switch is a switch most commonly used to operate electric lights, permanently connected equipment, or electrical outlets. Portable lamps such as table lamps may have a light switch mounted on the socket, base, or in-line with the cord. Manually operated on/off switches may be substituted by dimmer switches that allow controlling the brightness of lamps as well as turning them on or off, time-controlled switches, occupancy-sensing switches, and remotely controlled switches and dimmers. Light switches are also found in flashlights, vehicles, and other devices.

Answer:

A

Explanation:

The moon is connected to the ocoen

Answer:

Explanation:

Practical Applications of Sublimation

Sublimation and erosion cause ablation, a process that wears down glaciers. Sublimation of iodine may be used to reveal latent fingerprints on paper. Sublimation is used to purify compounds. ... Because dry ice sublimates so readily, the compound is used to produce fog effects.

Answer:

DNA is a complex, long-chained molecule. DNA contains the genetic blueprint for building and maintaining all living organisms. Found in nearly all cells, DNA carries the instructions needed to create proteins, specific molecules essential to the development and functioning of the body.

Answer:

Electrons are transferred in an iconic bond.

Answer:

Physical changes only change the appearance of a substance, not its chemical composition. Chemical changes cause a substance to change into an entirely substance with a new chemical formula. Chemical changes are also known as chemical reactions.

How are physical and chemical changes similar and different? (compare and contrast) (Physical and chemical changes are similar because matter experiences a change in state, Physical changes are different because matter remains the same substance, just in a different state, whereas chemical changes change the matter

Examples of chemical changes are burning, cooking, rusting, and rotting. Examples of physical changes are boiling, melting, freezing, and shredding. Often, physical changes can be undone, if energy is input. The only way to reverse a chemical change is via another chemical changes.

Explanation:

Answer:

Explanation:

In the scenario that is being described the control group would be the 50 men that have been given the placebo because they are the ones that should not have any effects from the placebo and that is by design. The manipulated variable is the new fat-burning pill because it is the one that the scientists can change and modify to try and achieve the desired results. Lastly, the responding variable are the 50 men who are given the new fat-burning pill because they are the ones that will be responding to the effects of the pill and providing the data needed by the scientists.

Answer:

balanced

Explanation:

A driver wants to drive at a constant speed so he uses his cruise control. He wants the forces acting on him to be balanced. Thus, the correct option for this question is D.

Cruise control may be defined as a type of system that significantly controls the speed of a motor vehicle automatically. It maintains the speed of the vehicle constant without the use of the accelerator pedal once you selected a specific speed.

The speed of the vehicle must remain constant during the course of time. This is possible when the force acting on the driver must be in a balanced state. Otherwise, it will be difficult for the driver to sustain the same speed for a long time.

Therefore, a driver wants to drive at a constant speed so he uses his cruise control. He wants the forces acting on him to be balanced. Thus, the correct option for this question is D.

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Answer:

Physical.

Explanation:

Nothing changes in a chemical state just adding hot air to a balloon.

I'm pretty sure this is classified as a chemical change.

Answer:

precipitate

Explanation:

pretty sure it's right but sorry if i'm wrong:)

Answer: non metal

Explanation:

Nonmetals are dull, possess high ionization energies and electronegatives and are typically poor electricity conductors as they're insulators.

Non metals are also brittle and possess low melting point. Therefore, with the explanation, the sample is most likely a non metal.

Answer:

conserve mass.

Explanation:

SOMEONE ANSWER DA QUESTON

Answer:Forces include gravity, friction, and applied force. Force causes changes in the speed or direction of motion.

Explanation:

Answer:

Its force, Just did it. 100%

Explanation:

No explaination needed. I got it right.

Mass of Li = 237.38 g

The mole itself is the number of particles contained in a substance amounting to 6.02.10²³  

[tex]\large {\boxed {\boxed {\bold {mol = \frac {mass} {molar \: mass}}}}[/tex]

Moles of Li = 34.2

Molar mass(MW) of Li = 6.941 g/mol

then mass of Lithium (Li) :

[tex]\tt mol=\dfrac{mass}{MW}\\\\mass=mol\times MW\\\\mass=34.2\times 6,941~g/mol\\\\mass=\boxed{\bold{237.38~g}}[/tex]

Answer:

60 hours

Explanation:

18.0 __15__ 9 __15__ 4.5 __15__ 2.25 __15__ 1.125g

15(4)= 60

Sodium-24 has a half-life of approximately 15 hours. If only one-eighth of the sodium-24 remain , then it has been passed in 60 hours. So option D is correct.

The time required for half of the original population of radioactive atoms to decay is called the half-life. The relationship between the half-life, T₁ ÷ 2, and the decay constant is given by T₁/2 = 0.693/λ

According to radioactive decay law, the rate of decay of radioactive atoms at any instant is directly proportional to the number of atoms present at that instant.

dtd N ∝ N

dtd N = λ N

where, N is number of integrated nucleus present in the sample at any time t and λ is decay constant.

Thus ,option D 60 hours is correct.

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Answer:

O spongy layer is the right answer