Answer:
Melting: one substance is involved and the liquid and solid are the same material.
To melt something heat is essential.
Dissolving: involves two materials;the resulting solution is a mixture of two substances.
The dissolved substance is still present in the solution even though it cannot be seen.
Explanation:
Hope this helps you
Do mark me as Brainliest
1. Which one of the following best describe sublimation?
A. A solid melting to a liquid which re solidifies.
B. A solid melting to a liquid which evaporates, the vapor condensing to a liquid and then recrystallizing.
C. The movement of gaseous particles so that they fill the spaces that they occupy.
D. A solid forming a vapor on heating and reforming as a solid on cooling.
E. The bombardment of large molecules by small molecules.
Answer:
i think it is D.
Explanation:
The answer is D because it’s where a solid turns to a gas without going through a liquid phase if that makes sense
One hour of bicycle riding can require 500-900 kcal of energy, depending on the speed, the terrain, and the weight of the racer. An individual wants to lose weight by riding at a modest effort, consuming 505 kcal of energy per hour. How many hours must he ride to lose 21.0 pounds of body fat? One gram of body fat is equivalent to 7.70 kcal of energy. There are 454 g in 1 lb.
Answer:
145 hours
Explanation:
Since one hour of riding a bicycle takes up 505 kcal of energy. It is also stated that one gram of body fat is equal to 7.70 kcal. Also, it is given that 1 pound of body fat is equal to 454 g.
Hence;
1 Ib= 454 g
21 Ib= 21 × 454/1 = 9534 g
But
1g of body fat = 7.70kcal
9534 g of body fat = 9534 × 7.70 kcal/1 = 73411.8 kcal
If 505 kcal is lost in 1 hour
73411.8 kcal is lost in 73411.8 kcal × 1hour/505k cal = 145 hours
What is the wavelength, in meters, of yellow light with a frequency of 5.10 x 1014 Hz?
Answer:
5.88 × 10⁻⁷ m
Explanation:
Speed of Light = Wavelength times Frequency
c = λν
Step 1: Define
c = 3.0 × 10⁸ m/s
ν = 5.10 × 10¹⁴ Hz
λ = unknown
Step 2: Solve for λ
3.0 × 10⁸ m/s = 5.10 × 10¹⁴ Hz · λ
λ = 5.88235 × 10⁻⁷ m
Step 3: Simplify
We are given 3 sig figs.
5.88235 × 10⁻⁷ m ≈ 5.88 × 10⁻⁷ m
If carbon dioxide is an invisible gas, why do we see fog when dry ice sublimes?
Answer:
because it is going from a solid to a gas.
Explanation:
also it's still cold
Plz help me and I promise I will make you he brainiest
Answer:
2
Explanation:
1 is definitely wrong
density must be lower to atop another liquid
in 3 ,I consider the example of water and oil whi has a lower boiling point
Answer:
2
Explanation:
A. Can you use mass alone to predict whether an object will sink or float?
Answer:
yess
Explanation:
What filters out liquid waste?
stomach
esophagus
kidneys
Answer:
kidneys
Explanation:
Quick chem question!
I will mark as BRAINLIEST!!!
Answer:
D
Explanation:
A and C sounds not logic
B is wrong since all the molecules has different numbers of carbon and hydrogen
D sounds correct because triple covalent bond exist at the C-C bonding
How is data not actually obtained from the experiment represented in a line graph?
•with a double line
•with a colored line
•with a broken line
•with only dots
Answer:
with a double line
Did you title your lab report?
Did you state the purpose of the investigation?
Did you include a brief overview of the investigation?
Materials and Procedure
Did you make a list of materials? Did you include quantities and SI units?
Did you present the steps of the procedure as a numbered list?
Did you note any changes to the original procedure?
How many moles is 5.38 x 10^21 atoms of sodium
Answer:
The answer is
0.0089 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]
From the question
N = 5.38 × 10²¹ atoms of sodium
We have
[tex]n = \frac{5.38 \times {10}^{21} }{6.02 \times {10}^{23} } \\ = 0.00893687...[/tex]
We have the final answer as
0.0089 molesHope this helps you
What is the causes of gaseous
pressure ?
A rectangular solid has a length of 3 cm a height of 4 cm and a width of 5 cm what is the solid volume ?
How do the lines of the brain and the neurons work together to communicate
Make a funny sentence for ductile
Here is an example of mercury, It HAS to be for Magnesium.
¨I’m a highly stable element, so you can count on me¨
Copper and tin wire are both ductile and able to be stretched.
Earth’s tides are affected by the gravitational pull of the Sun and the Moon, but mainly the Moon because the Moon is _______(1) Each day, each costal region on Earth experiences two high tides and two low tides in a ______(2) time period. This is because the gravitational attraction of the Moon creates ______(3) on two opposite sides of the planet. Two spring tides occur monthly, when the Moon is in its new and full phases. During these phases, the Moon and Sun are oriented ______________________,(4) which gravitationally pulls the water on Earth in the same direction, creating a large tidal range.
(1) A. closer
B. larger
C. denser
(2) A. 12-hour
B. 16-hour
C. 24-hour
(3) A. tidal bulges
B. moon phases
C. orbits
(4) A. in a straight line
B. at a right angle measuring 90 degrees
C. at an acute angle measuring 23 degrees
Answer:
1 closer
2 24hours
3 tidal bulges
4 in a straight line
Explanation:
Tides have been the effect of the sea with the gravitational pull of the sun and moon.
1. Earth’s tides are affected by the gravitational pull of the Sun and the Moon, but mainly the Moon because the Moon is closer to the earth.
In spite of high pull of the Sun, the distance of moon from earth results in increased effect of moon gravitational pull than Sun.
2. Each day, each coastal region on Earth experiences two high tides and two low tides in every 24 hours time period.
The daily tides has been resulted at the coast with the moon revolution around the earth's rotation.
3. This is because the gravitational attraction of the Moon creates tidal bulges on two opposite sides of the planet.
The effect of the moon gravitational force results in the bulging or the pulling force to the sea, resulting in the diurnal tides.
4. Two spring tides occur monthly, when the Moon is in its new and full phases. During these phases, the Moon and Sun are oriented at a right angle measuring 90 degrees which gravitation pulls the water on Earth in the same direction, creating a large tidal range.
For more information about the high and low tides, refer to the link:
https://brainly.com/question/296886
is salt always soluble is water?
For example, salts of sodium, potassium and ammonium are usually soluble in water. Notable exceptions include ammonium hexachloroplatinate and potassium cobaltinitrite. Most nitrates and many sulfates are water-soluble
Answer:
Many ionic compounds exhibit significant solubility in water or other polar solvents. Unlike molecular compounds, salts dissociate in solution into anionic and cationic components. For example, salts of sodium, potassium and ammonium are usually soluble in water.Explanation:
Hope this helpsPLEASE HELP ASAP!!!
What is the mass of the element above?
-1
-2
-3
-4
-5
Answer:
its 1 not negative
the atom shown below was hydrogen, known as H.
The chemical formula for sodium sulfate is Na2SO4. How many sulfur atoms are in the formula for sodium sulfate?
Answer:
1
Explanation:
there is only one sulphur (S) atoms in the formula for sodium sulphate
The chemical formula for sodium sulfate is Na₂SO₄.One sulfur atoms are in the formula for sodium sulfate.
What is chemical formula ?The term chemical formula shows the elements that create the compound and the numbers of atoms of each element in the smallest unit of that compound, be it a molecule or a formula unit.
Chemical formulas are classified into three types: empirical, molecular, and structural.
Empirical formulas depict the simplest whole-number ratio of atoms in a compound, whereas molecular formulas depict the number of each type of atom in a molecule and structural formulas depict how the atoms in a molecule are bonded to each other.
Thus, the chemical formula for sodium sulfate is Na₂SO₄. In sodium sulphate two molecules of sodium, one atom of sulfur, and four atoms of oxygen are present.
To learn more about the chemical formula, follow the link;
https://brainly.com/question/11995171
#SPJ6
fog forms when a water vapor changes to the___ state of matter?
Answer:
Gas
Explanation:
4. The half-life for a 100-gram sample of radioactive element X is 5 days. How much of element X remains after 10 days have passed?
A. 25 g
B. 50 g
C. 75 g
D. 100 g
how can i find the sum of 18236.34+3244213-7654=
Answer:
3250113.34
Explanation:
Align decimals together
If the other numbers don't have decimals, you can add a decimal and zeros after the decimal as it means the same thing
2 1 1 1
18236.34
3244223.00
+ 7654.00
3250113.34 is the answer
Answer:
-3254795.34
Explanation:
you add 18236.34 and 3244213 and get 3262449.34
then you subtract 7654 from 3262449.34 and get -3254795.34
A rock displaces 475ml of water what’s its volume
Answer:
The rock displaces 475 mL of water.
475 mL is the volume of the rock.
1 mL = 1 cm^3
The mass is just density times volume.
m = 475 * 2.5 = 125 g
Explanation:
HELP ME ASAP TO GET BRAINLYYYY!!!!
Answer:
B C A
Explanation:
because as you pour the blue stuff in it will straight up go to the bottom (and has less blue coloring) Then it will go to the top (lil more blue coloring) then eventually the whole jar will be blue
hope this helps you out bro
Answer:
The order is B, C, A.
Explanation:
When the liquid is first poured into the container, the entropy is still very high because there is a very large difference in color of the liquid. The more time passes, entropy becomes lower because the blue color liquid disperses through the rest of the container. So the entropy is the highest in B and lowest in A. At A the entropy is as close to 0 as it can be in this situation out of the three parts.
Why do you need to use a roman numeral with transition metals, but not with the alkali and alkali earth metals?
Answer:
Because they have variable oxidation states
Explanation:
Transition metals are designated with roman numerals because they have variable oxidation states.
They do not form a single ionic ion as seen by the main group elements.
Transition metals are known for their variable ions they form in ionic state. They belong to the d-block on the periodic table. They are also known to from colored solutions.If an atom has 14 protons, 13 neutrons, and 14 electrons, what is it?
-silicon-14
-silicon-13
-silicon-27
-silicon-28
-none of these
Answer:
cilicon 14
Explanation:
how many atoms are in 4 Mg(OH)2 ?
Answer:
20 atoms
broo this is easy plz give me harder questions smh
How many electrons does the Mg+2 ion have?
Answer:
10 electrons
Explanation:
The easiest way to do this is to simply look at the periodic table, find the atomic number of magnesium, and subtract 2 from it. The reason this works is that the atomic number tells you how many protons an element has. If we want the element to be neutral, then by definition it will have the same number of electrons.
Answer:
10 Valence Electrons
Explanation:
Easiest thing to do is to look at your periodic table :)
Why is governmental funding of research important?
A. The government makes sure all scientists get the same amount of
money.
B. The government grants funding only to scientists whose research
won't harm people.
C. Scientists work for the government, which is where they get their
money from.
D. The government determines what is right and wrong for everyone.
Answer:
D. The government determines what is right & wrong for everyone
Explanation:
How many O's are in Al2(SO4)3 ?
Answer:
12 moles O
In one mole of aluminum sulfate, Al2(SO4)3 , there are 2 moles Al atoms, 3 moles sulfur atoms, and 12 moles O atoms
Explanation:
Answer:
1...
Explanation: