Answer:
When the number of particles, though in this case I think you mean (electrons), changes in an atom....it become an ion. Ions are atoms that were chnaged by losing or gaining an electron. If an atom gains an electron it will have a negative charge. If an atom loses an electron it will have a positive charge. Hope this was helpful!!
Explanation:
Which property refers to how light reflects off of a mineral?
A. fracture
B. cleavage
C. streak
D. luster
Answer:
D. Luster
Explanation:
Luster describes how a mineral reflects off light. It is in the definition.
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PLEASE HELP ASAP ONLY HAVE 10 MINUTES. A certain photon of light has a wavelength of 422 x 10 -9 m. What is the frequency of the light? Show work
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.
Plants need to take in gases and release gases during their
everyday life processes. What part allows plants to do this?
Answer:
The Stomata
Explanation:
The Stomata is found in the leaves of plants and controls their gas exchange with the environment around them.
What would the total mass of a 4.9 mole sample of Barium (Ba) be if its Molar Mass is 137g?
O 132g
O 142g
O 671g
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.
What does electro negativity value depend on ?
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:
Hope this helps :)
elements Combine with atoms with F in the same ratio as atoms of Mg
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:
Each of the jars was heated 90°C each jar was placed on the counter and allowed to cool
Use the information below to explain why the atomic radius decreases across a period.
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.
identify the PowerHouse of a cell
A. Golgi
B. lysosome
C. ribosomes
D. nucleus
E. mitochondrion
F. cytoplasm
G. rough endoplasmic reticulun
H. membrane
Which expression represents the number 0.00017 written in scientific notation?
A.1.7 x 10-3
B.1.7 x 103
C.1.7 x 104
D. 1.7 x 10-4
Answer:
D
Explanation:
Move the decimal and count the places
How many mL are in 7.3 dL?
Answer:
730 mL which is .73 L
Explanation:
Answer dis please I will like and 5 star if correct
Natural process in which certain gases in the atmosphere keep heat near earth and prevent it from radiating into to space
The greenhouse effect is a process in which gases in the atmosphere keep heat near earth and prevent it from radiating into space.
What is the greenhouse effect?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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Which statement best describes the atoms of the gas neon?
They slide past each other.
They move freely in all directions.
They vibrate in place.
They are packed closely together.
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:
How are covalent molecules named?
A. A number is used in front of each element's name, and the first element is changed to end in -ide.
B. A prefix is added to each element's name, and the second element is changed to end in -ide.
C. A roman numeral is used to indicate the number of atoms of each element.
D. The name of each element is followed by a number to indicate the amount of atoms.
Answer:
A prefix
Explanation:
you're welcome
The covalent molecules named as,
A prefix is added to each element's name, and the second element is changed to end in -ideSo, option B is correct one.
What is covalent molecules?The molecule formed by sharing of electrons between atoms is called covalent molecules .The atoms which form covalent molecules must have similar or less electnegativity difference.Examples of covalent molecules are hydrogen molecule [tex]H_{2}[/tex] ,carbon dioxide, methane etcTo learn more about covalent molecules,
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Please help brainiest is award!!!!!!!!!!!
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:
Julie tears a piece of notebook paper. This is a(n) _____.
is this correct please help?
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.
find the density of a brick that has a mass of 57 g and a volume of 12 ml
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!!
What is a mole in chemistry
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:
What elements are involved with fission
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.
What is the volume of a 30.0 g sample of A which has a density of 8.00 g/cm3?
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
Which thing has the greatest
mass and volume?
• a very large rock
• a big balloon
• a mud puddle
• a car
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
Periodic Trends
PLEASE HELP ME! I WILL GIVE BRAINLIEST
Which descriptions apply to eukaryotic cells? Check all that apply.
are usually multicellular
contain a true nucleus
contain membrane-bound organelles
has DNA located in the cytoplasm
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.
What are Eukaryotic cells?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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Sara takes a 40-minute bus ride from her home to her grandparents’ home, which is 8 km away. What is the average speed of the bus.
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
The half life of iodine-125 is 60 days. What was the initial amount of iodine-125 if you have 4.5 grams after 360 days?
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 order of particle in all substance is the same
A True
B false
Answer:
false false false false
What is the difference between an element and a compound? Give an example of each.
please answer in a sentence.
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
