Answer:
Let x moles of silicon contains 2.8x10^24 atoms. 6.02x10^23 atoms are present in 1 mole of Si. Therefore 2.80x10^24 atoms are present in = 2.8x10^24/6.02x10^23 = 4.65 moles of Si.
Explanation:
According to the big bang theory, which statement is accurate about how the universe came to be?
It expanded slowly.
It gradually warmed.
Stars and galaxies formed.
Atoms such as hydrogen were destroyed
Answer:
The term Big Bang defines that the Universe has expanded from the ancient hot and thick primary situation at some fixed time in the past.
Big Bang theory refers to the origin of the Universe. In the beginning, universe is very heavy and small hot ball of matter. It was a point no bigger than the head of a pin when all the things squished with each other and universe is expanded with huge explosion of energy. Due to expansion, it is cooled and results in the formation of Stars and galaxies. After sometime, atoms formed like helium and hydrogen.
Thus, statement (1), (3) and (4) is correct whereas statement (2) and (5) is incorrect. the right answer is - (It expanded slowly), (Stars and galaxies formed,) (Atoms such as hydrogen and helium formed.)
Explanation:
The statement 'stars and galaxies formed' is accurate about how the universe came to be according to the big bang theory.
What is the big bang theory?The big bang theory is a widely accepted theory in physics that intends to understand the origin of the universe.
According to this theory, the universe started with a hot and dense single point that progressively inflated and stretched.
The big bang theory has two major principles:
The universe is continuing to expand nowadays.An explosion caused matter and energy to expand in order to form all the universe.The big bang theory postulates that this phenomenon occurred approximately 13 billion years ago.
In conclusion, the statement 'stars and galaxies formed' is accurate about how the universe came to be according to the big bang theory.
Learn more about the big bang theory here:
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N
Nitrogen
14.0
Which two parts are needed to make a neutral atom of nitrogen?
A. Electron clouds with a total of seven electrons
B. A nucleus with three protons and four neutrons
O C. A nucleus with seven protons and seven neutrons
D. Electron clouds with a total of 14 electrons
Answer:
electron - proton
Explanation:
fsger
Answer:
A. Electron clouds with a total of seven electrons
Explanation:
A neutral atom of nitrogen must have a total number of 7 electrons in its cloud.
This is the required number of electrons to bring nitrogen into its state of neutrality.
To maintain neutrality the number of protons and electrons in an atom must be equal. A charge atom called an ion have either the proton or electron greater. Neutrality is attained when the number of protons and electrons are the same.When two substances are mixed together, a color change is observed. Does this mean that a chemical reaction has definitely occurred?
Yes because any change indicates a chemical reaction.
No because some physical changes produce color changes.
No because color changes are not indicators of chemical reactions.
Yes because color changes occur only when new compounds are formed.
Answer:
B
Explanation:
Because color change also indicates a physical change as well.
There are ______ moles in 3.73 x 1023 formula units of barium chloride.
Answer:
0.62 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L}\\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
[tex]n = \frac{3.73 \times {10}^{23} }{6.02 \times {10}^{23} } = \frac{3.73}{6.02} \\ = 0.619601...[/tex]
We have the final answer as
0.62 molesHope this helps you
How many grams are equal to 3.46 moles of iodine
?
875.38 g are equal to 3.46 moles of iodine.
What is moles?The mole is the SI basic unit of substance quantity, with the sign mol. The amount of substance in an object or sample is defined as the number of elementary entities of that substance.
It is given that n = 3.46, molar mass of iodine = 253 g/mol.
Moles can be expressed as:
Moles = mass /molar mass
3.46 mol= mass / 253 g/mol.
mass = 253 g/mol ×3.46 mol
mass = 875.38 g.
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PLEASE HELP WITH THESE THREE (30 POINTS)
1) How is the number of neutrons in the nucleus of an atom calculated?
A. Add the number of elections- and protons+ together
B. Subtract the number of elections- from protons+
C. Subtract the number of protons+ from the atomic mass number
D. Add the atomic mass number to the number of elections-
2) Lithium (Li), Sodium (Na), Potassium (K), Rubidium (Rb), Cesium (Cs), and Francium (Fr) are in the same group on the periodic table. Why? *
A. They have the same size.
B. They react with each other.
C. They have similar properties.
D. They have the same number of protons
3) Which of the following elements would be a transition metal?
A. Ca
B. Au
C. Rb
D. Fr
Please help me with this!
Answer:
D
Explanation:
Glucose is made of 6 Carbon atoms, 12 Hydrogen atoms, and 6 Oxygen atoms.
The equation is: C6H12O6
Answer: D
Explanation: D because it has more molecules elements then the glucose.
Which statement is true concerning the elements in families 1 and 2?
A. All the elements in families 1 and 2 have three electrons in their outer shell.
B. All the elements in families 1 and 2 need the s and p sub-levels to place their outer
shell electrons.
C.All the elements in families 1 and 2 need only 2 energy levels to place their
electrons.
D. All the elements in families 1 and 2 can place all their outer shell electrons in the s
sub-level.
Answer:
The correct option is;
D. All the elements in families 1 and 2 can place all their shell electrons in the s sub-level
Explanation:
The elements in families 1 and 2 also called the group 1A and group 2A elements are known as the alkali and alkaline earth metals. The elements in the families 1 and 2 are also referred to as the s-block elements as they have their valence electrons which are 1 and 2 respectively, in the s-orbital or s sub-level
Due to their low ionization energy, and the ease with which they donate their valence electrons, elements of the families 1 and 2 are known to be very reactive, and are found in a combined state in nature.
Do you agree with using pesticides that kill honeybees? What better alternative to pesticides could farmers use and explain the consequences this might have.
Answer:
I do not agree with using pesticides as it is a chemical and can inflict poison in the system. A better alternative would be using smoke to keep the pests away or some natural pesticide. The effect would most likely be lower quantities of crops and higher food prices however.
Explanation:
this is the possible answer on edg.
Answer:
I do not agree with using pesticides as it is a chemical and can inflict poison in the system. A better alternative would be using smoke to keep the pests away or some natural pesticide. The effect would most likely be lower quantities of crops and higher food prices however.
Explanation:
Which of the following correctly shows the flow of energy in a food chain?
hawk ⇒ snake ⇒ mouse ⇒ grass
grass ⇒ hawk ⇒ snake ⇒ mouse
mouse ⇒ snake ⇒ hawk ⇒ grass
grass ⇒ mouse ⇒ snake ⇒ hawk
Answer:
hawk .snake. mouse and grass
Help I WILL AWARD BRAINLIEST
Answer:
see the pic for the answer
What is the element with 2 protons on the
periodic table?
Hydrogen was the first element with 1 proton
So the second one with 2 protons must be
Answer:
Helium
Explanation:
insertion mutation definition ?
Answer:
Insertion is a type of mutation involving the addition of genetic material. An insertion mutation can be small, involving a single extra DNA base pair, or large, involving a piece of a chromosome.
Explanation:
insertion is some sort of mutation that records the addition of genetic material
A sixth grade teacher takes students on a field trip to the beach. One student finds several pebbles that have a rounded shape and are smooth to the touch. What process most likely shaped these pebbles?
Answer:
the one you have selected is correct
Explanation:
Answer:
The shape of the pebbles is a result of weathering and deposition.
Explanation:
The periodic table is organized into vertical groups of
A
elements with similar properties.
B
comporlds with different properties.
с C
elements with all the same chemical properties.
compounds with all different physical properties.
There are ??? molecules in one mole regardless of what the substance is.
Answer: The mole allows people to calculate the number of middle schoolers entities (usually atoms or molecules. Isabella's number is an absolute number: there are 6.022 × 1023 middle schoolers entities is in 1 mole. This can also be written as 6.022 × 1023 mol-1.
Explanation: I hope that helped !!
Isaac wants to make s'mores. He holds a marshmallow on a metal skewer over a fire. A few seconds later, the marshmallow is cooked and the skewer feels warm. What most likely happened?
The fire heated the surrounding air, which cooked the marshmallow.
The heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.
The heat from the skewer cooked the marshmallow.
Thermal energy in the form of heat moved from the fire to the skewer and marshmallow.
Answer:
Thermal energy in the form of heat moved from the fire to the skewer and marshmallow.
Explanation:
He holds a marshmallow on a metal skewer over a fire. A few seconds late, the marshmallow is cooked and the skewer feels warm.
The heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.
What is thermal energy?The term thermal energy refers to a form of energy that exists as a result of the temperature difference between two bodies. Thermal energy will always flow from the hotter to the cooler body.
Hence, the marshmallow is cooked and the skewer feels warm shortly after because the heat generated from the marshmallow flowed in the form of thermal energy to the skewer and fire.
Learn more about thermal energy:https://brainly.com/question/11278589
amino acid is to protien as?
1) fat is to lipid
2) dna is to rna
3)sugar is to fat
4) simple sugar is to starch
Each of the models shown represents a magnesium atom. Which models show the same isotope of magnesium? P, Q, and R
P and Q
P and R
Q and R
Answer:
P and Q
Q and R
Explanation:
To begin, we must bear in mind the meaning of isotope.
Isotopes are atoms having the same atomic number (i.e proton) but different mass number due to the difference in the neutron number present in the atoms involved.
Thus, we shall write out the number of protons, neutrons and electrons present in the model given above. This is given:
Model P:
Proton = 12
Neutron = 13
Electron = 13
Model Q:
Proton = 12
Neutron = 12
Electron = 13
Model R:
Proton = 12
Neutron = 13
Electron = 12
From the above data, we can say that:
1. P and Q are isotope since they have different Neutron number.
2. P and R are not isotope since they have the same Neutron number.
3. Q and R are isotope since they have different Neutron number.
Based on this chemical equation KNO3 --> KNO2 + O2
Please identify the kind of chemical reaction represented
A Synthesis
B Decomposition
Single Replacement
D Double Replacement
E) Combustion
HURRY PLEASE THIS NEEDS TO BE TURNED IN BY 4:00pm
PLEASE HURRY WILL GIVE BRAINLIEST TO FASTEST, MOST HONEST
of what importance is the gas ozone in the stratosphere? how would a decrease of ozone in the stratosphere affect the radiation received at earth's surface?
Answer :D
It acts as a shield to protect Earth's surface from the Sun's harmful ultraviolet radiation.
There you go :D
Without the weakening of the shield, we would get skin cancer, cataracts, and impaired immune systems.
___
Could you try to answer one of my questions pls? :D
Is oxygen radioactive yes or no?
Answer:
ima go with no.....
Explanation:
Answer:
Stable isotopes are variants of atoms that differ in mass but do not decay over time, that is, they are not radioactive. The element oxygen (O) is found in three naturally occurring stable isotopes. So oxygen is not radioactive.
Explanation:
How do atoms make molecules?
Explanation:
Atoms can join together - they form bonds together - to make MOLECULES. ... For example, a hydrogen atom forms one bond, an oxygen atom forms two, and carbon forms four bonds. Look at that molecule of water again - each hydrogen has one bond, and the oxygen in the middle has two bonds. Molecules can be much bigger.
to chemicals mixed together to make heat physiacal or chemical change THATS IS ALL IMMA SAY ( DONT ANSWER IF THERES NO EXPLATION )THXSSS HAVE A GOOD DAY
Answer:its a chemixal change because there are stuff getting mixed togehter making it a chemiacl change
Explanation:
What relationship, if any, do you see between a star’s color and its temperature?
Answer: their is relationship
Explanation: The amount of light produced at each wavelength depends on the temperature of the object producing the light. Stars hotter than the Sun (over 6,000 degrees C) put out most of their light in the blue and ultraviolet regions of the spectrum.
In which location of the digestive system will you find both physical AND chemical digestion?
Answer:
The stomach
Explanation:
In the stomach, physical digestion occurs because of peristaltic contractions (wave like contraction in the lean muscle) and chemical digestion occurs because of stomach acid, hydrochloric acid, breaking down your food.
8. Were there any problems with the experiment or the methods? Did you have any surprising results
Calculate the volume that 140 g of H2 gas will occupy at 305 K and 8.2 atm.
Answejust put my mum said i didnt have to do this question
Explanation:
becuase im cool like that
I need help with this!
Answer:
wavelength decreases, the frequency increases
Explanation:
In the electromagnetic spectrum, as the wavelength decreases, the frequency increases.
The wavelength of the wave is the distance between successive troughs and crests along the wave train.
Frequency of the wave of the number of waves that passes through a point per unit of time.
On an electromagnetic wave, as the wavelength decreases the frequency increases. Also, as the wavelength increases the frequency decreases.Which compounds have carbon-carbon double bonds?
Answer:
Aikens/hydrocarbons
Explanation:
because the formula of this is Cn H²n
