Answer:
1) The evidence that the universe is expanding can be explained by the observed redshifted light from distant galaxies which according to the evaluation means that the galaxies are in recession. The observation was explained by Hubble's law which stated that the rate of recession of the galaxies from the Earth is proportional to their away distance
2) The Big Bang Theory is a theory that scientists used to explain the origin of the universe. According to the big bang theory states that the universe started from an extremely high temperature and high density singular state that exploded and expanded over time to the the present day universe
3) Another evidence that supports the Big Bang Theory is the cosmic background radiation which is has its origin from the Big Bang
Explanation:
Sodium combines with water to produce sodium hydroxide and hydrogen gas. Which word equation represents this violent reaction? sodium hydroxide + water Right arrow. Sodium + hydrogen sodium + water Right arrow. Sodium hydroxide + hydrogen sodium + hydrogen Right arrow. Sodium hydroxide + water sodium + sodium hydroxide Right arrow. Water + hydrogen
Answer:
Explanation:
When Sodium reacts with water it forms Sodium hydroxide and hydrogen gas. Sodium being a alkali metal reacts violently with water and catches fire during this reaction
word equation
[tex]Sodium+Water[/tex]→[tex]Sodium Hydroxide+ hydrogen gas[/tex]
Chemically
[tex]2Na(s) + 2H2O[/tex]→[tex]2NaOH(aq) + H2(g)[/tex]
Sodium hydroxide and hydrogen gas are formed when sodium combines with water. As an alkali metal, sodium interacts violently with water, catching fire in the process.
Word equation:-
Sodium+Water →Sodium hydroxide+hydrogen
Chemically, the reaction is as follows:-
[tex]2Na+2H_2O\rightarrow2NaOH+H_2[/tex]
Na-Sodium
[tex]H_2O[/tex]-Water
NaOH-Sodium hydroxide
[tex]H_2[/tex]-hydrogen
Hence, the word equation is:-
Sodium+water Right arrow Sodium hydroxide+hydrogen
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Answer:
C
Explanation:
I don't have this class but I'm 99.9% sure it's C. :)
what is the periodic table and what does it mean elements???
Answer:
The periodic table is a tabular array of the chemical elements organized by atomic number, from the element with the lowest atomic number, hydrogen, to the element with the highest atomic number, oganesson. The atomic number of an element is the number of protons in the nucleus of an atom of that element.
Explanation:
answer:
what is the periodic table?
the the periodic table is:
basically an arragement all of the of the chemical elements organized by atomic number, from the element with the lowest atomic number, (hydrogen), to the element with the highest atomic number, (oganesson).
what are elements?
elements are:
a substance that is made entirely from one type of atom.
example: the element hydrogen is made from atoms containing a single proton and a single electron. if you change the number of protons an atom has, you change the type of element it is.
explanation:
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Which is an example of mechanical weathering?
hydrated minerals
iron oxide
water moving over rocks
limestone cave formations
The answer is water moving over rocks.
I got it right on my quiz :)
which base-pair rules apply to the double helix structure?
SELECT ALL THAT APPLY
a. A-G
b. G-T
c. A-T
d. C-G
What is the name of Na2CO3
Answer:
its sodium carbonate
Explanation:
Answer:
Explanation:
you just said it Na2CO3
A car travels a distance of 200 meters in 10 seconds. What is the average speed of the car?
Answer:
72,000mph
Explanation:
hope this helps
When you stir sugar into your tea with a spoon, the tea keeps swirling
even after you take your spoon out. *
which law of motion is it?
When you stir sugar into your tea with a spoon, the tea keeps swirling
even after you take your spoon out.This is first law of motion.
What is motion?
Motion is defined as a phenomenon which is described with respect to change in object's position with respect to time.It is given in terms of displacement,velocity,distance ,acceleration,speed.
Branch of physics which deals with motion of objects without any reference to it's cause is called kinematics while the branch which studies forces and their effects on motion is called as dynamics.
Motion applies to various systems like objects,bodies, matter particles ,radiation ,curvature.There are three laws of motion which are proposed by Newton.Classical mechanics is based on Newton's law of motion.Relativistic mechanics is based on modern kinematics.
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how does the concept of conservation of mass apply to chemical reactions?
Answer:
mass cannot be created nor destroyed just moved around
Explanation:
The law of conservation of mass or principle of mass conservation states that for any system closed to all transfers of matter and energy, the mass of the system must remain constant over time, as the system's mass cannot change, so quantity can neither be added nor be removed so it can only be moved around during a chemical reaction
Which of the following identifies a type of electromagnetic radiation with a higher frequency than Microwaves but a lower frequency than Ultraviolet waves?
Radio waves
X-rays waves
Gamma waves
Infrared waves
Answer:
infrared
Explanation:
it goes (in increasing order)
radio
microwave
infared
visible light
ultraviolet
xray
gamma ray
The infrared radiation in the electromagnetic spectrum is come in between ultraviolet waves and microwaves. It have high frequency than microwave and low frequency than UV rays. Thus option D is correct.
What is electromagnetic spectrum?Electromagnetic spectrum is the arrangement of different radiations in the order of increasing frequency or increasing energy thus in the decreasing order of wavelength.
The longer wave is radio waves with lowest energy and then microwave after that infrared waves are arranged in the spectrum. Thus next from visible light to UV, gamma and x-rays energy and frequency increases.
Higher wavelength radiations are less powerful but travel more distance where as shorter waves are more powerful but travel less. Thus, the radiation have less frequency than UV rays but high frequency than microwave is Infrared rays. Option D is correct.
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Fritz Haber, a German chemist, discovered a way to synthesize ammonia gas (NH3) by combining hydrogen and nitrogen gases according to the following equation:
3H2(g) + N2(g) → 2NH3(g)
What volume of nitrogen is needed to produce 250.0 L of ammonia gas at STP?
L
What volume of hydrogen is needed to produce 2.50 mol NH3 at STP?
L
Answer:
Volume of nitrogen needed = 125.5 L
Volume of hydrogen needed = 84.05 L
Explanation:
Given data:
Volume of ammonia produced = 250.0 L
Volume of nitrogen needed = ?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Number of moles of ammonia:
PV = nRT
1 atm× 250.0 L = n × 0.0821 amt.L/mol.K × 273K
250.0 atm.L = n × 22.41 amt.L/mol
n = 250.0 atm.L /22.41 amt.L/mol
n = 11.2 mol
Now we will compare the moles of ammonia with nitrogen.
NH₃ : N₂
2 : 1
11.2 : 1/2×11.2 = 5.6 mol
Volume of nitrogen needed:
PV = nRT
1 atm× V = 5.6 mol × 0.0821 amt.L/mol.K × 273K
V = 125.5amt.L/1 atm
V = 125.5 L
2nd)
Given data:
Number of moles of ammonia produced = 2.50 mol
Volume of hydrogen needed = ?
Solution:
Chemical equation:
N₂ + 3H₂ → 2NH₃
Now we will compare the moles of ammonia and hydrogen.
NH₃ : H₂
2 : 3
2.50 : 3/2×2.50 = 3.75 mol
Volume of hydrogen:
PV = nRT
1 atm × V = 3.75 mol × 0.0821 amt.L/mol.K × 273K
V = 84.05 amt.L/1 atm
V = 84.05 L
A measurement must have a ________________ and ___________________ to be concerned correct.
Answer:
Explanation:
grips with three basic problems: error; representation, which is the justification of number …
At -15°C, water is a:
solid,liquid,gas
Answer:
Water is a solid.
Explanation:
Water freezes at 0° C, or 32°F.
Please mark me Brainliest, I need it to move onto the next level.
Explain a limiting factor for each location in the South America Ecosystems Interactive
Answer:
just getting 5 points
Explanation:
3 questions for branliest!! Please help.
1. Noble Gas with the largest radius?
2. Least electronegative of the halogens? (not astatine)
3. What element is 1s2 2s2 2p6 3s2?
Can some please help me understand what this means!!
Write the electron configurations of the following elements. Only write them as noble gas or full if it states to do so.
1. Phosphorus (P) Full configuration : ______________________________________________
2. Ruthenium (Ru) Full configuration : _____________________________________________
3. Barium (Ba) Noble gas configuration : ____________________________________________
4. Thorium (Th) Noble gas configuration : ___________________________________________
Answer: Phosporus- 1s2 2s2 2p6 3s2 2p3
Ruthenium- 1s2 2s2 2p6 3s2 3p6 4s2 3d10 4p6 5s2 4d6
Barium- (Xe)6s2
Thorium- (Rn) 6d2 7s2
Which statement is true?
A.
A molecule having a covalent bond can be ionic.
B.
A molecule having a covalent bond is always polar.
C.
A molecule having a covalent bond may be polar or nonpolar.
D.
A molecule having a covalent bond is always nonpolar.
Answer:
c) A molecule having a Covalent bond may be polar or non polar
Which statement accurately describes the products of a reaction?
A: melting of a substance
B: a change in color of a substance
C: freezing of a substance
D: boiling of a substance
Answer:
B: a changing in color of a substance
Explanation:
The answer is B because whatever substance you get it would have a reaction of color
BRAINLIEST TOTHE CORRECT ANSWER!!! Why is C6H12O6 not considered to be an empirical formula for glucose?
Its molecular formula is C6H12O6. Since each of the subscripts is divisible by 6, the empirical formula for glucose is CH2O.
It´s just the way it is. Have a good day!
Its chemical structure is C[tex]_6[/tex]H[tex]_{12}[/tex]O[tex]_6[/tex]. The empirical formula that glucose is CH[tex]_2[/tex]O since every one of the subscripts being divided by 6.
What is empirical formula?The definition of an empirical formula for a compound is one that displays the ratio of the components present in the complex but not the precise number of atoms in the molecule. Subscripts are used next to the component symbols to indicate the ratios.
If you are aware of the compound's molar mass, you may apply the equation to determine its molecular composition. Dividing the compound molar mass either by empirical formula mass after calculating the organic compound with the formula mass to get this. Its chemical structure is C[tex]_6[/tex]H[tex]_{12}[/tex]O[tex]_6[/tex]. The empirical formula that glucose is CH[tex]_2[/tex]O since every one of the subscripts being divided by 6.
Therefore, the empirical formula that glucose is CH[tex]_2[/tex]O since every one of the subscripts being divided by 6.
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A mutation is a change in ___.
A. protein
B. sex cell
C. body cell
D. gene
Answer:
gene
Explanation:
brainly crown?
Answer:
D, gene
Explanation:
Mutations are abnormal changes in the DNA of a gene.
Which type of waves travel faster gamma or radio
Answer:
radio
Explanation:
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. Radio wave travel faster than gamma wave.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave.
There is a relation between energy of wave. frequency of wave, and wavelength of wave
Mathematically,
E=hc/λ
where,
E = energy of electromagnetic wave
h is planks constant having value 6.67×10⁻³⁴js
c is speed of light that is 3×10⁸m/s
λ is the wavelength of electromagnetic wave
Therefore, radio wave travel faster than gamma wave.
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El cloro es un elemento capital en la potabilización del agua. A la natura se han encontrado dos isótopos del cloro, 35Cl y 37Cl. Indica los parecidos y diferencias entre estos dos isótopos si los átomos se encuentran en un estado eléctricamente neutro.
Answer:
I cant understand. Can you translate it to english?
Why does the compass needle move when the compass is placed near the wire?
Answer:
it moves because the wire is metal and when metal is near a compass it throughs off the direction because metal has its own magnetism.
Explanation:
I hope this helps.
Answer the Question where it says, “Model It!” Thank You! Really Appreciate It! :)
Answer: Thx for the free points brother!
Explanation: Thx!
A drop in the water table produced when water is
overpumped from a well, is called
Answer:
I feel stupid saying this but a spring??
Explanation:
Sorry it was only a guess
Which element has a larger atomic radius than sulfur? O chlorine O cadmium fluorine oxygen
Answer: solo necesito puntos lo siento
Explanation:
Answer:
Cadmium has larger atomic radius than sulfur.
Explanation:
Down a period, atomic radii decrease from left to right due to the increase in the number of protons and electrons across a period: when a proton is added the pull of the electrons towards the nucleus is larger, so the size of the atom decreases.
Hence, you can compare the elements that belong to a same period and predict that the atom with lower atomic number (number of protons) will haver larger atomic radius. With that:
Oxygen and fluorine are in the period 3, being oxygen to the left of fluorine, so oxygen is larger than fluorine.
Sulfur and chlorine are in the period 4, being sulfur to the left of chlorine, so sulfur is larger than chlorine.
Now see whan happens down a group. Atomic radius increases from top to bottom within a group due to electron shielding. That permits you to compare the size of the elements in a group:
Fluorine and chlorine are in the same group (17), with chlorine directly below fluorine, so the atomic radius of chlorine is larger than the atomic radius of fluorine.
Sulfur and oxygen are in the same group (16), with sulfur directlly below oxygen, so sulfur the atomic radius of sulfur is larger than the atocmi radius of oxygen.
So far, you can rank the atomic radius of sulfur, chlorine, fluorine, and oxygen, in increasing order as:
O < F < Cl < S, concluding that O, F, and Cl have smaller atomic radius than S.
Cadmiun, Cd, is to the left and below sulfur, so both electron shielding (down a group) and increase of the number of protons (down a period) lead to predict the cadmium has a larger atomic radius than sulfur.
the average mass of all the isotopes of an element is called the ______________.
will mark brainlest for the best answer.
good luck
Answer:
atomic mass
Explanation:
the avergae mass of all the isotopes of an element is called the atomic mass. the atomic mass is the mass of an atom.
PLEASE HELP!!!! ANSWER 2 QUESTIONS FOR 50 POINTS AND BRAINLIEST!
What is the reaction ship between cells and tissues
Answer:
the answer is a bc tissues are a bunch of cells clumped together and tissues make up organs
Explanation:
A scientist plants two rows for experimentation. She puts fertilizer on row 1 but does not put fertilizer on row 2. Both rows receive the same amount of water and light intensity. She checks the height of the corn growth over the course of 5 months. What is a constant in this experiment?
Answer:
Water and light intensity
Explanation:
In an experiment, the component parts of the experiment usually includes a variable which is of two types- independent variable, dependent variable; a constant and a control.
An independent variable is the part of the experiment the person changes or controls.
The dependent variable is the part of the experiment that changes due to changes being made to the independent variable.
The control group is a part of the experiment in which all variable factors have been kept constant and which is used as a standard to compare with other trials of the experiment.
A constant is the part or factor which do not change and is kept constant during the experiment.
In the experiment conducted by the scientist, the two rows of plant receives the same amount of water and light intensity, therefore, they are both the constants.