Answers
Answer:
Fireworks is exothermic
Endothermic is Cookies
Explanation:
Exothermic reactions transfer energy to the surroundings and the temperature of the surroundings increases. Endothermic reactions take in energy and the temperature of the surroundings decreases.
Hope this helps
Related Questions
Is 5O2 a Element or Compound?
Answers
Which pair of elements will have the same number of valence numbers
A- lithium and barium
B- gallium and germanium
C- tellurium and polonium
D- iondine and xenon
Mark as brainlist :)
Answers
Tellurium and Polonium have 6 valence electrons.
Calculate the maximum mass of potassium sulfate, K2SO4, that could be formed when 4.9 g of sulfuric acid reacts with excess potassium hydroxide.
H2SO4 + 2KOH → K2SO4 + 2H2O
Answers
Answer:
From 4.9 g of sulfuric acid 8.175 g of potassium sulfate is formed.
Explanation:
Given data:
Mass of H₂SO₄ = 4.9 g
Mass of K₂SO₄ formed = ?
Solution:
Chemical reaction:
H₂SO₄ + 2KOH → K₂SO₄ + 2H₂O
Number of moles of H₂SO₄:
Number of moles = mass/ molar mass
Number of moles = 4.9 g/ 98.1 g/mol
Number of moles = 0.05 mol
Now we will compare the moles of H₂SO₄ with K₂SO₄ .
H₂SO₄ : K₂SO₄
1 : 1
0.05 : 0.05
Mass of K₂SO₄:
Mass = number of moles × molar mass
Mass = 0.05 mol × 174.3 g/mol
Mass = 8.715 g
Thus, from 4.9 g of sulfuric acid 8.175 g of potassium sulfate is formed.
a student is using colored beads to make a model of aluminum sulfate, Al2(SO4)3.
Aluminum atoms are represented by green beads, sulfur atoms by blue beads, and
oxygen atoms by yellow beads. What combination of beads should the student use for
the model?
Answers
The combination of beads should the student use for the model :2 green, 3 blue and 12 yellow
the modelFurther explanationIn the chemical formula of a compound there are numbers:
1. The number indicates the number of atoms written after the element symbol
2. The number after the parentheses represents the number multiplied by the number of atoms in parentheses.
3. The number before the chemical formula shows the number of molecules behind it, which is usually used in equations
To calculate the beads needed to make a model, we must count the number of atoms of the Al₂(SO₄)₃ molecule
In the Al₂ (SO₄) ₃ molecule there are 3 atoms : Al, S, and O
1. Number of Al atoms: 2 2. The number of atoms S = 3 x 1 = 3 3. The number of atoms O = 4 x 3 = 12So the combination of beads
2 green(for Al), 3 blue(for S) and 12 yellow(for O)
Answer:
2 blue, 3 yellow, and 12 green
Explanation:
is sandy, silt, or clay loam better? and why?
Answers
the action force always acts in the ____ direction as the reaction force
Answers
Answer:
opposite
Explanation:
Newtons law explains that for every action force there is an equal and opposite reaction.
1. Based on its location, which element would you predict has chemical properties most
similar to argon (Ar)?
A. Chlorine (CI)
C. Nitrogen (N)
B. Helium (He)
D. Aluminum (Al)
Answers
Answer:chlorine
Explanation:
It’s the answer on the big test
when water changes state from a liquid to a solid is energy absorbed or lost?
Answers
Answer:
Loses
Explanation:
liquid changes into solid, heat is released. The energy released upon freezing, known as the enthalpy of fusion, is a latent heat, and is exactly the same as the energy required to melt the same amount of the solid.
Answer:
Matter either loses or absorbs energy when it changes from one state to another. For example, when matter changes from a liquid to a solid, it loses energy. The opposite happens when matter changes from a solid to a liquid. For a solid to change to a liquid, matter must absorb energy from its surroundings.
Explanation:
Put the following scientists in order of their discoveries: 1. Dalton, 2. Bohr, 3. Rutherford, 4. Democritus, 5. Thomson
Please help me I really need the answer
Answers
which statement describes what happens inside
a liquid thermometer that shows an increase in
temperature?
a. the volume of the liquid decreases because
of an increase in kinetic energy.
b. the movement of the particles decreases
because of a decrease in kinetic energy. .
c. the volume of the liquid increases because
the movement of the particles decreases.
d. the movement of the particles increases
because of an increase in kinetic energy.
Answers
Answer:the volume of the liquid increases
Explanation:
someone please i need help
Answers
Answer:
the answer 32/43
Explanation:
The rule of three or is a way of solving problems of proportionality between three known values and an unknown value, establishing a relationship of proportionality between all of them. That is, what is intended with it is to find the fourth term of a proportion knowing the other three. Remember that proportionality is a constant relationship or ratio between different magnitudes.
If the relationship between the magnitudes is direct, that is, when one magnitude increases, so does the other, the direct rule of three must be applied. To solve a direct rule of three, the following formula must be followed:
a ⇒ b
c ⇒ x
So,
The direct rule of three is the rule applied in this case as follows: If the change in water level is 0.05 inches per hour, what is the change in water level after 24 hours?
change in water level=1.2 inches
To pass a decimal number to a fraction, you must:
Put the decimal number in a fraction above a 1. That is, the decimal number is the numerator, 1 the denominator.
Find an equivalent fraction. That fraction will carry in the denominator a 1, an
Finally, the change in the water level of the pond after 24 hours is 1.2 inches or what is the same inches
How many molecules are in 1.35 mol of CS2
Answers
Answer:
There are there are 8.13-10^25
Explanation:
N(CS2)= 1.35* (times) 6.02-10^ 25= 3.13-10^25 molecules
Mole measure the number of elementary entities of a given substance that are present in a given sample. Therefore, 8.12×10²³ molecules are in 1.35 mole of CS[tex]_2[/tex].
What is mole?The SI unit of amount of substance in chemistry is mole. The mole is used to measure the quantity of amount of substance. It measure the number of elementary entities of a given substance that are present in a given sample. There are so many formula for calculating mole.
we know one mole of any element contains 6.022×10²³ atoms which is also called Avogadro number
number of atoms/molecules=number of moles × 6.022×10²³(Avogadro number)
number of moles of CS[tex]_2[/tex] = 1.35 mol
Substituting all the given values in the above equation, we get
number of atoms/molecules= 1.35 × 6.022×10²³
number of atoms/molecules=8.12×10²³ molecules
Therefore, 8.12×10²³ molecules are in 1.35 mole of CS[tex]_2[/tex].
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3
1 point
1
Select ALL of the true statements
An atom of a given element will still be that element if the number of protons changes
Atoms are mostly made of empty space
An atom of a given element will still be that element if the number of electrons changes
OOGOOO
An atom of a given element will still be that element if the number of neutrons changes
Electrons have a negligible mass compared to the rest of the atom
The atoms mass comes mostly from the neutrons
Previous
Answers
Answer:
Not 100% sure but...
Explanation:
I know that the second, third and fifth one are correct, not sure if there are any more.
Which metal is most likely to form more than one kind of positively charged ion?
A.Sodium
B.Barium
C.Nickel
D.Magnesium
Answers
Answer:
D.Magnesium
Explanation:
Cause imma nerd
List 3 properties of solids. Do the same for liquids and gases.
Answers
Answer:
GAS .assumes the shape and volume of its container
particles can move past one another
.compressible
lots of free space between particles
.flows easily
particles can move past one another
LIQUID assumes the shape of the part of the container which it occupies
particles can move/slide past one another
.not easily compressible
little free space between particles
.flows easily
particles can move/slide past one another
SOLID .retains a fixed volume and shape
rigid - particles locked into place
.not easily compressible
little free space between particles
.does not flow easily
rigid - particles cannot move/slide past one another
Help please if you can answer this first I'll give you the brainliest
Answers
Answer:
1. gas
2. false
Explanation:
What is the role of
electrons within an
atom?
A.
Electrons are in the nucleus and have a
negative charge
B. Electrons are in the nucleus and have a
positive charge
C. Electrons are outside the nucleus and
have a negative charge
D. Electrons are outside the nucleus and
have a positive charge
Answers
Option C - Electrons are outside the nucleus and and have a negative charge is the correct alternative.
We have electrons.
We have to determine their role inside the atom.
What are Electrons ?An electron is one of the subatomic particles within an atom. It is negatively charged particle whose magnitude is 1.6 x 10⁻¹⁹ C.
According to the question -
The role of electrons inside the atom is as follows -
Electrons revolve around the nucleus.They carry a negative - charge of -1.6 x 10⁻¹⁹ C.Hence, Option C is the correct alternative.
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a student collected data about how different fertilizers affect a plant growth. which type of graph should they use to show the data? PLS HELP ASAP :C worth 100 points lol
Answers
Answer:
I think they should use a bar graph
Explanation:
Because if they use a bar graph they could mark each of the different kind of fertilizer and they could easily see which one affected it the most, either good or bad, by the looking at the heights of the bars to determine your conclusion.
Hi there!
:bar graph:
If they use a bar graph they could mark each of the different kind of fertilizer and they could see easier to tell which one affected it the most, by looking at the heights of the bars to determine the answers.
What is the process by which new oceanic crust is added?
A Seafloor Spreading
B) Earthquakes
C) Trenches
D) Plate Tectonics
Answers
Answer: A
Explanation:
Answer:
A.Seafloor spreading
Explanation:
how are electrons arranged in elements with atomic numbers 1 through 10?
Answers
Answer:
See explanation
Explanation:
For elements with atomic numbers 1-10, the arrangement of electrons is as follows; 1s 2s 2p.
These elements are found in the second period that commences at lithium and ends in neon.
The ten electrons that may be found in the atoms of these elements are arranged in orbitals as shown above.
What is the charge of an Pb atom with 81 electrons?
Answers
Answer:
+1 Because there are 82 protons.
Explanation:
Which of the following is the best structure for CH2O2? Explain your reasoning.
Answers
Answer:
I'm guessing structure 1
Answer:
no
Explanation:
no
If you were to decrease thermal energy, what would happen to the particles?
Answers
Answer: Explanation:
You can change an object's state of matter by adding or removing thermal energy. When you add thermal energy to an object, these things can happen: Particles move faster (increased kinetic energy). Particles get farther apart (increased potential energy).
A meteorologist uses a weather map to explain an upcoming change in weather. The map shows a blue line with triangles approaching a red line with semicircles. Based on the map, which weather prediction is most valid? (1 point) A a significant drop in temperature will occur across the area. B There is no chance of precipitation in the forecast. C Warm temperatures will replace cold temperatures. D Humidity levels will rise.
Answers
Answer:
Option C: Warm temperatures will replace cold temperatures.
Explanation:
In a weather map, a warm front is depicted with a red line and red semi circles while a cold front is depicted with a blue line and blue triangles.
Now, we are told that the map shows a blue line with triangles approaching a red line with semi-circles. This means that the cold front is approaching the warm front.
Now a warm front is simply defined as the transition zone where warm air mass gradually replaces a cold air.
Thus, it means the weather map depicts the fact that warm temperature is replacing cold temperature.
Thus; Option C is correct.
Answer: 1: A cold front moved into the area. 2: It would actually be A. A significant drop in temperature will occur across the area. 3: Movement of large air masses. 4: “A Strong Cold Front Threatens the Region”. 5: a meeting of two air masses with major differences in temperature and moisture.
Hope you got 100 because of this!
in one to 2 sentences explain how a stimulus to one type of receptor might be percieved as a simulus to another type of receptor in people who have synesthesia???
HELP
Answers
Synesthetes — or people who have synesthesia — may see sounds, taste words or feel a sensation on their skin when they smell certain scents.
I don't know if this helps at all, but i hope it does.
Which element would you expect to have the largest radius based on the Periodic Table?
Lead
Selenium
Chlorine
Answers
Answer:
Lead
Explanation:
As you move down the periodic table, the elements get larger and gain additional electron shells, increasing the radius. In order, they are on the table as Chlorine, Selenium, Lead.
How could the combustibility of a substance influence how the substance is used?
Answers
Answer:
Combustibility is a measure of how easily a substance bursts into flame, through fire or combustion. This is an important property to consider when a substance is used for construction or is being stored. It is also important in processes that produce combustible substances as by product
3. What is a molecule?
Answers
Answer:
a molecule is defined as an element or compound consisting of two or more atoms held together by chemical bonds
i hope this helps :)
Explanation:
What is true about warm, saturated air?
It contains less water vapor than cold air.
It contains the same amount of water vapor as cold air.
It does not contain any water vapor.
It contains more water vapor than cold air.
Answers
Answer:
It contains more water vapor than cold air
According to the process of conduction which take place from hot to cold end warm saturated air has more water vapor than cold air.
Conduction is defined as a process as a means of which heat is transferred from the hotter end of the body to it's cooler end.Heat flows spontaneously from a body which is hot to a body which is cold.
In the process of conduction,heat flow is within the body and through itself.In solids the conduction of heat is due to the vibrations and collisions of molecules while in liquids and gases it is due to the random motion of the molecules .
As per the concept of conduction, warm hair has more water vapor than cold air, thus the correct option is that warm, saturated air has more water vapor than cold air.
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Is the solution a heterogeneous mixture?
Answers
Answer:
nope homogeneous
Explanation:
hope this helps :)
Answer:
SOLUTIONS are homogeneous mixtures. A solution is a mixture of two or more substances in a single phase.