365,000,000 scientific notation

Answer:

it doesnt even give you enough information for you to answer it

Explanation:

Answer:

it doesnt even give you enough information for you to answer it

Explanation:

Answer:

An atom's electronegativity is affected by both its atomic number and the distance at which its valence electrons reside from the charged nucleus. The higher the associated electronegativity, the more an atom or a substituent group attracts electrons.

Explanation:

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Answer:

m = 671 grams

Explanation:

Given that,

No of moles, n = 4.9

Molar mass of Barium, M = 137 g

Mass divided by molar mass is equal to no of moles. It can be given by the formula as follows :

[tex]n=\dfrac{m}{M}\\\\m=n\times M\\\\m=4.9\times 137\\\\m=671.3\ g[/tex]

or

m = 671 grams

So, the total mass of the sample of Barium is 671 grams.

Answer:  Chemical symbols are used to represent atoms and elements.  A compound consists of atoms of two or more elements combined in a small, whole-number ratio. Atoms of each of its elements are always present in the same ratio

Explanation:

Answer:

Several heavy elements, such as uranium, thorium, and plutonium, undergo both spontaneous fission, a form of radioactive decay and induced fission, a form of nuclear reaction.

Answer:

V = 3.75 cm³

Explanation:

Density = Mass / Volume

Step 1: Define variables

D = 8.00 g/cm³

M = 30.0 g

V = unknown

Step 2: Substitute and Evaluate for V

8.00 g/cm³ = 30 g/ V

V = 15/4 cm³

V = 3.75 cm³

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

The greenhouse effect is a process in which gases in the atmosphere keep heat near earth and prevent it from radiating into space.

Greenhouse effect can be described as the process by which radiations from the sun are absorbed by greenhouse gases and do not travel back into space. This prevents the surface of the earth from freezing.

The sun heats up the earth’s atmosphere during the day and the earth cools down at night by radiating heat back into the atmosphere. The heat is absorbed by the greenhouse gases and makes the surface of the earth warmer, which makes the survival of living beings on earth possible.

But because of the increased levels of greenhouse gases, the temperature of the earth has considerably increased. The major contributors to greenhouse gases are automobiles, deforestation,  factories, etc. which increases the amount of these gases in the atmosphere.

The greenhouse gases do not allow radiation or heat to escape from the earth and increasing the surface temperature of the earth and leading to global warming.

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Answer:

false false false false

12 Km / hour

Explanation:

using the formula

average speed =  ( where time is in hours )

40 min =  =  hour

speed = 8 ÷  = 8 ×  = 12 Km / hour

Answer:

12 Km / hour

Answer:

An element is a single atom by itself found on the periodic table. A compound  is made when two or more elements chemically bond together. An example of an element is hydrogen. (H) An example of a compound is [tex]H_{2} O[/tex].

Explanation:

explained above

Answer:

B. They move freely in all directions.

Explanation:

i got it right on my test on edge

Answer:

B. They move freely in all directions.

Explanation:

Answer:

D. Luster

Explanation:

Luster describes how a mineral reflects off light. It is in the definition.

Answer:

D

Explanation:

Move the decimal and count the places

Answer:

A prefix

Explanation:

you're welcome

The covalent molecules named as,

So, option B is correct one.

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Answer:

7.11 x [tex]10^{14}[/tex] Hz

Explanation:

The equation for converting wavelength to frequency is ν=c/λ, or the speed of light over wavelength. The speed of light is 3.00 x [tex]10^{8}[/tex], and our wavelength here is 422 x [tex]10^{-9}[/tex]. All we have to do now is substitute our given values:

[tex]\frac{3.00x10^{8} }{422x10^{-9}}[/tex]

After reduction, our answer comes out to be about 7.11 x [tex]10^{14}[/tex] Hz.

Answer:

[tex]\boxed {\tt Number \ and \ unit}[/tex]

Explanation:

The two requirements for a measurement are a number and a unit.

For example, here is a measurement:

38.6 cm

The number is 38.6 and the unit is cm, or centimeters.

Therefore, both number and unit are correct.

Answer:Mole, also spelled mol, in chemistry, a standard scientific unit for measuring large quantities of very small entities such as atoms, molecules, or other specified particles.

Explanation:

Answer:

4.75 or 4.8

Explanation:

density = mass / volume

57 / 12 = 4.75

from here you can leave it as is or round up.

hope this helps!!

Answer:

730 mL which is .73 L

Explanation:

Answer:

The Stomata

Explanation:

The Stomata is found in the leaves of plants and controls their gas exchange with the environment around them.

Answer:

either a car or a rock

Explanation:

because the rock can weigh more than the car , and vice-versa with the car weighing more than the rock

Answer:

The first 3

Explanation:

Eukaryotic cells are usually multicellular, contain a true nucleus, and contain membrane-bound organelles. Hence, options A, B and C are correct.

The eukaryotic cell has a nuclear membrane that surrounds the nucleus, in which the well-defined chromosomes (bodies containing the hereditary material) are located.

Eukaryotic cells are usually multicellular, contain a true nucleus, and contain membrane-bound organelles.

Hence, options A, B and C are correct.

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Answer:

Detail is given below.

Explanation:

Atomic radius  trend along period:

As we move from left to right across the periodic table the number of valance electrons increases. The atomic size tend to decrease in same period of periodic table because the electrons are added with in the same shell. When the electron are added, at the same time protons are also added in the nucleus. The positive charge is going to increase and this charge is greater in effect than the charge of electrons. This effect lead to the greater nuclear attraction. The electrons are pull towards the nucleus and valance shell get closer to the nucleus. As a result of this greater nuclear attraction atomic radius decreases and ionization energy increases because it is very difficult to remove the electron from atom and more energy is required.

we can see in picture A there is one positive charge and force of attraction is 2.30×10⁻⁸ N

In picture D there are 2 positive charge and force of attraction is 4.60×10⁻⁸ N

So by increasing the positive charge force of attraction also increases.

In F we can see there is more positive charge thus force of attraction is also greater.