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
Which condition must be met for conduction to occur?
particles must be large
particles must be small
particles must be in contact
particles must be spread apart
The condition that must be met for conduction to occur is particles must be in contact. Therefore, the correct option is option C.
What is conduction flow of heat?A pan heats up when you place it on the flame. It's because heat is transferred from the burner to the pan. Also, it allows any other utensil or pan to heat up. Yet after a while, the vessel cools down when you remove it from the heat. That happens because the vessel's heat is dissipated onto the surrounding area.
It enables the vessel to cool. Heat is passed from a warm object towards the cold object in both situations. Typically, it occurs in every situation. Conduction is the process through which heat is transported from one object's hot end to its cool end. The condition that must be met for conduction to occur is particles must be in contact.
Therefore, the correct option is option C.
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Which sentences describe disadvantaged of burning fossil fuels instead of using hydrogen fuel cells
Explanation:
thanks thanks thanks thanks thanks
Burning fossil fuels takes place inside expensive fuel cells.
Fossil fuels are nonrenewable.
What is the mass percent of a sugar solution having 15 g sugar dissolved in 63 g of solution?
Answer:
23.81%
Explanation:
15 × 100
63
23.809%
23.81%
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:
i answered your questions & hope you have a great day!
pls give me brainliest <3
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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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 scientist had the first true atomic theory?
Which of the following is an alkaline earth metal. Hh
Answer:
The alkaline earth metals are six chemical elements in group 2 of the periodic table. They are beryllium, magnesium, calcium, strontium, barium, and radium.
Hope this helped!
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.
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.
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
Under the right conditions, sodium (Na) and chlorine (Cl) can chemically combine to form sodium chlorine. Which of the following best explains how sodium and chlorine are able to create sodium chlorine?
A: sodium and chlorine exchange neutrons between eachother when they combine
B: electrons are transferred between sodium and chlorine when they combine
C: extra protons are created when both sodium and chlorine combine
D: The nucleus of both sodium and chlorine combined together
Answer:
I am pretty sure the answer is B
Explanation:
how many joules are needed to melt 24.9 grams of ice at 0° C?
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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HELP!!!! I HAVE 2 MINUTES!!!
A substance placed into an open plastic container at room temperature exerts a force against the bottom of the container but not the sides of the container. What is the most likely phase of this substance?
A. gas
B. solid
C. liquid
D. plasma
Answer:
a solid
Explanation:
because because gas would excerpt forced throughout the whole container and plasma would be too hot for the plastic container and liquid would flow throughout the container touching the sides and solid is the only one that would probably only touch the bottom of the plastic container exerting force through there
You observe a car parked on the side of the road. If the car started to move, Which conclusion could you make?
The forces were balanced when the car was parked, but one or more forces changed. The total forces became unbalanced, causing it to move.
The forces were unbalanced when the car was parked. When the car moved, they became balanced.
The forces were balanced when the car was parked. The forces stayed balanced when it moved.
The forces were unbalanced when the car was parked, and two or more forces changed. The forces stayed unbalanced and caused the car to move.
Answer:
it was stable because of it was in Potential energy and unstable because it was in kinetic energy or vice Versa. im somehow confused
Please I need help ASAP . I will mark brainliest
Answer:
1） add water
Explanation:
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:
Please I need help ASAP . I will mark brainliest
Answer:
Explanation:
"Sublimation is the transition of a substance directly from the solid to the gas state, without passing through the liquid state."
This MIGHT be wrong, so dont assume this is the exact answer. Thats just what the internet says....
Hope I helped!!!
-Alexis ❤
explain how a bright-line spectrum is produced, in terms excited state, energy, and ground state
Answer:
cuz the light is a fraction of the world is screens like: tablets,tv,phones,computers. so the world is like nothing to anyone revolves around electronics so if you lost your electronic for 3 days.....could you do it???? (p.s the finge is pointing at you)
Explanation:
When the hot iron block is placed in the beaker containing room temperature water, what happens to the kinetic energy of the water?
Can someone please help me!!??
Answer:
cyfctr rytfuhv
Explanation:
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) At a given temperature, the temperature value is a measure of the total kinetic energy of all the molecules. (B) At a given temperature, all the particles have the same amount of kinetic energy. (C) At a given temperature, the average kinetic energy of the molecules is constantly changing. (D) At a given temperature, the temperature value is a measure of the average kinetic energy of all the molecules.
Answer:
(D) At a given temperature, the temperature value is a measure of the average kinetic energy of all the molecules.
Explanation:
Kinetic energy is defined as the energy of an object due to its motion.
Kinetic energy remains the same at a constant temperature but increases with an increase in temperature.
At a given temperature, the temperature is the measure of the average kinetic energy of all the molecules. With the increase in temperature of the molecule, some of the absorbed energy is stored within the particles and some of the energy contributed to the motion of the molecules. This causes change in average kinetic energy of molecules due to an increase in temperature.
The root mean square (RMS) speed of the molecules is the square root of the average of each individual velocity squared.
Hence, the correct answer is "(D)."
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 :)
Please help me with my science work
Answer:
what question do you need help with
Explanation:
Four materials are put into small containers. These materials are then moved from the small containers into larger containers. Which material will spread out to completely fill a larger container?
Answer quickly please
A.Air
B.Ice
C.Sand
D.Water
Answer:
Air
Explanation:
Air expands
How many conversion factors would be used to convert 20 hectoliters to milligrams?
Help please❤️
Answer:
From unit Symbol Equals Result To unit Symbol
Explanation:
is this volume??? i need specifics
What occurs after cytokinesis is completed at the end of meiosis I?
Four haploid cells are formed.
Two diploid cells are formed.
Two haploid cells are formed.
Four diploid cells are formed.
Answer:
c
Explanation:
dewqewqwwAnswer:
d
Explanation:
eweqwe
