Please help meee!!!

I believe your answer would be

2.781

Answer:

0.000000899

Explanation:

8.99x10^-7

move the decimal to the left 7 times.

0.000000899

Answer:

0.000000899

Explanation:

.,.......,.........

Answer:

to make them more stable by filling up electrons

Answer:

They have the same number of electrons as protons.

Explanation:

Atoms are electrically neutral means that all the charges within the atom are balance to equal neutral. An atom has the same number of protons as it does electrons, therefore the charge is neutral.

An ion has a different number of electrons than protons, making the ion either positively or negatively charged.

Answer:

Hi! I am currently taking AP Chemistry, I'll try to help you out.

That quote basically just means that the atom as a whole is not positively or negatively charged. Atoms are made up of protons, neutrons, and electrons. Neutrons are neutrally charged. Protons are positively electrically charged. And electrons are negatively electrically charged. In atoms, if there is an even number of protons and electrons, they can cancel each other's charges out, which results in the atom as a whole being electrically neutral.

Hope this helps! Feel free to mark me Brainliest if you feel this helped. :)

Sodium-22 remain : 1.13 g

The atomic nucleus can experience decay into 2 particles or more due to the instability of its atomic nucleus.  

Usually, radioactive elements have an unstable atomic nucleus.  

General formulas used in decay:  

[tex]\large{\boxed{\bold{N_t=N_0(\dfrac{1}{2})^{T/t\frac{1}{2} }}}[/tex]

T = duration of decay  

t 1/2 = half-life  

N₀ = the number of initial radioactive atoms  

Nt = the number of radioactive atoms left after decaying during T time  

half-life = t 1/2=2.6 years

T=15.6 years

No=72.5 g

[tex]\tt Nt=72.5.\dfrac{1}{2}^{15.6/2.6}\\\\Nt=72.5.\dfrac{1}{2}^6\\\\Nt=1.13~g[/tex]

Answer:

the answers are

Explanation:

5,6,7,8&9.

Answer:

Pressure is an important physical quantity—it plays an essential role in topics ranging from thermodynamics to solid and fluid mechanics. As a scalar physical quantity (having magnitude but no direction), pressure is defined as the force per unit area applied perpendicular to the surface to which it is applied. Pressure can be expressed in a number of units depending on the context of use.

Explanation:

Probably not the best answer but hope this helps somewhat. :)

Answer:

In a controlled experiment, an independent variable (the cause) is systematically manipulated and the dependent variable (the effect) is measured; any extraneous variables are controlled. State what steps you will take to design an experiment to test your hypothesis. Complete the experiment. Make observations. Record what happened during your experiment.

Answer:

288 grams

Explanation:

The amount of any radiative substance left after some time is calculated by

amount left = [tex]x/2^n[/tex]

where x is the initial amount of substance

n is the number of half lives

one half live is the time in which amount of substance reduce to half of its initial value.

------------------------------------------------------

amount left = 4.5 grams

half life of  iodine-125 = 60 days

total time in which substance reduced to 4.5 grams  = 360 days

thus,

number of half life in 60 days = 360/60 = 6

thus, there are period of 6 half lives

in each half life the amount of substance reduces to its previous half

let the initial amount be x grams

using the formula

amount left = [tex]x/2^n[/tex]

[tex]4.5 = x/2^6 \\ 4.5 = x/64\\x = 4.5*64 = 288[/tex]

Thus, 288 grams was the initial amount of iodine-125

Answer:

Number of Protons - 66

Number of Neutrons - 97

Number of Electrons - 66

Explanation:

You're welcome :3

Answer:

Convection currents occur when a fluid is near a heat source.

Explanation:

Heat sources provide energy to their surroundings. When fluid receives this energy, molecules inside it move around more, spacing out from each other and lowering the density.

We know from helium balloons that things with lower densities than their surroundings are pushed upwards. Therefore, the fluid close to the heat source moves upwards, as it is hotter than the rest.

As this fluid moves up, cooler molecules drift down, succumbing to gravity.

As hot molecules move up and further from the heat source, they cool down, and drop. As colder molecules drop and move towards the heat source, they heat up, and begin rising.

This results in a circular motion called a convection current. It is present in the strong winds at the seaside and in the magma in the Earth's mantle.

Answer:

Pie/Circle graph

Explanation:

Pie/Circle Graphs are best for demonstrating parts of a whole, especially with percents.

Answer:

Infrared radiation → A) used to detect the location of objects

Microwaves → D) Used in radar and to heat food

Ultraviolet light → C)Given off by very hot objects, such as the sun  Heat from warm objects

Visible light → B) All the radiation humans can see, ranging from red to violet

Explanation:

Microwaves have magnetic waves with very long lengths, greater than that of infrared light. These waves are produced through vibrations that produce heat, as the microwave is turned on, which allows the food to be heated. These waves are also used to provide communication on some types of devices.

Infrared radiation is a type of non-ionizing radiation that has a low frequency and therefore cannot be visualized, since it is not within a visible electromagnetic spectrum, having a frequency lower than red. It can be used to detect the licalization of objects and does not pose a health risk.

Ultraviolet radiation is extremely harmful to our body. It is characterized by radiation with very small wavelengths, less than 400nm. This type of radiation can be released by the sun and ultraviolet lamps.

Visible light refers to the simplest form of electromagnetic wave and covers all the radiation that our eyes can see, allowing different colors to be seen in the objects we observe according to the reorganization of atoms and molecules.

Answer:

A=Microwaves

B=Ultraviolet light

C=Visible light

D=Infared radiation

Explanation:

A) Used in radar and to heat food

B) Given off by very hot objects, such as the sun

C) All the radiation humans can see, ranging from red to violet

D) Heat from warm objects, used to detect the location of objects

TOOK THE EXAM

The Potential energy of the body is 11.8 Joules

The mechanical energy of the egg is given by the formula:

Mechanical energy = Potential energy + kinetic energy

Given the following parameters;

From the formula:

Potential energy = ME = KE

Potential energy = 2.3 - 05

Potential energy = 1.8 Joues

Hence the potential energy of the body is 11.8 Joules

Learn more on mechanical energy here: https://brainly.com/question/24443465

Answer:

80C

Explanation:

As a substance gets hotter, or as a substance gets closer to the state of gas, the particles in the substance move faster, become more spread out and have more energy. This is why Gas has the most energy while solids have the least. Therefore, the hotter a substance is the more energy it has.

A glass of water at 80°C will have the most amount of energy

Explanation:

So, from this, we can conclude that glass with water at a higher temperature that is 80°C will have a  higher amount of energy than a glass of water at 20°C.

Learn more about temperature here:

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brainly.com/question/5427186?referrer=searchResults

Answer:

the internal force of attraction between the particle or molecules.

In solids the force is max.

In liquid it is intermediate.

And least in the gases..

Answer:

weight = newton

mass = kilogram

volume = cubic meter

density = kilogram per cubic meter

Answer:

weight hghhiixjdhdhbdnfnfjfjjcndndnfmckkxkx

John Dalton contribute to the understanding of the atom that all matter was composed of atoms, indivisible and indestructible building blocks.

While all atoms of an element were identical, different elements had atoms of differing sizes and mass.

An atom is a particle of matter that uniquely defines a chemical element.

An atom consists of a central nucleus that is usually surrounded by one or more electrons.

Dalton's atomic theory was the first complete attempt to describe all matter in terms of atoms and their properties.

Dalton based his theory on the law of conservation of mass and the law of constant composition.

The theory states that all matter is made of atoms, which are indivisible.

(1) All matter is composed of tiny, indivisible particles, called atoms, that cannot be destroyed or created.

(2) Each element has atoms that are identical to each other in all of their properties.

Learn more about the atom here:

https://brainly.com/question/1566330

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Answer:

If you increase the concentration of a reactant, there will be more of the chemical present. More reactant particles moving together allow more collisions to happen and so the reaction rate is increased. The higher the concentration of reactants, the faster the rate of a reaction will be.

If a large office building is 1.07 x 10^2 meters long, 31 meters wide. and 4.25 x 10^2 meters high, then the volume of the building would be 1409725 meters cube.

It can be defined as the mass of any object or body per unit volume of the particular object or body. Generally, it is expressed as in gram per cm³ or kilogram per meter³.

As given in the problem we have to calculate the volume of a large office building having the dimensions of  1.07 x 10 ^2 meters long,  31 meters wide, and 4.25 x 10^2 meters high.

The volume of the office building = length × width × height

                                                        =107 × 31 × 425

                                                        =140925 meters cube

Thus, the volume of the building would be 140925 meters cube.

To learn more about density from here, refer to the link;

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Answer:

C.

Explanation:

1..orbit

2..7

I hope this was helpful

Answer:

Elements in fluids.

Explanation: They're formed from elements crystalizing in fluids (Like water.) For example limestone forms on the bottom of the ocean from calcium.

Answer:

The precipitation of ions in solution

Explanation:

Answer:

pints

Explanation:

Answer:

B: pints

fl.oz.

Explanation:

Answer:

The density of water is 1 g/mL.

Explanation: