Answer: The difference between a physical reaction and a chemical reaction is composition. In a chemical reaction, there is a change in the composition of the substances in question; in a physical change there is a difference in the appearance, smell, or simple display of a sample of matter without a change in composition.
Explanation:
Someone please help, I will give brainliest, I am desperate. NO LINKS!!!
Answer: A. 8.8%
Explanation:
Percent Error Formula: approximate error - actual value divided by actual value (Approximate-Actual/Actual). After those steps are completed, multiply by 100 to make it a percentage form.
0.365 - 0.400 = -0.035
-0.035 / 0.400 = 0.0875
0.0875 * 100 = 8.75%
8.75% rounded to the nearest tenth is 8.8%
Which description of salt is a physical property?
Answer:
White being the color and coming in small grains.
Explanation:
Physical properties are something you can clearly see about the object.
Answer:
Hey mate......
Explanation:
This is ur answer....
It was in the lesson, the answer is it is solid and does not conduct electricity.
Physical Properties Chemical Properties
White cubic crystals Do not undergo combustion
Odorless, salty taste Make ionic bonds easily
As solids, they do not conduct electricity The product of mixing acids and bases.
Hope it helps!
Brainliest pls!
Follow me! :)
Nylon is a synthetic material that has many uses. It is used in the production of machine parts, cookware, and fabric. Nylon is made from petroleum and natural gas. Suppose that there were a shortage of petroleum and natural gas. What would companies that produce nylon likely need to do? A. identify a different natural resource that nylon could be made from B. search for nylon in many different parts of the earth C. convert existing nylon back into petroleum and natural gas D. find a way to make nylon without using natural resources
In case of a shortage in petroleum and natural gas, a company should find a way to make nylon without using natural resources.
Nylon is a very important material used in numerous applications. As a result of this, the demand for nylon as a raw material has genuinely been on the high side ever since.
However, nylon production depends on petroleum and natural gas. It is possible that there could be a shortage of these resources since they are obtained from the environment. In such cases, a company should find a way to make nylon without using natural resources.
Learn more about polymers: https://brainly.com/question/17555341
Answer:
identify a different natural resource that nylon could be made from
Explanation:
I just did this question
is seafloor spreading is beneficial or harmful for the earth
Answer:
Yes
Explanation
I learned it in science class
Please Help! (Will mark brainliest)
How many chlorine atoms are in 4 moles of chlorine?
A sample of acetaminophen has 100,000 molecules in it.
Answer:
2.409*10^24
Explanation:
If I am not mistaken you are supposed to do 4*6.022*10^23. This will allow for it to be converted.
I hope this helped
Which gas makes your voice deeper or has the opposite effect on you than helium when you inhale it.
Answer:
Sulfur hexafluoride
Explanation:
It is heavier than air that we breathe so it has an opposite effect.
Hope this helps. Pls give brainliest. Also pls sub to kgirl633 on yt!
Why does all matter contain thermal
energy?
A. Because particles stop moving
B. Because all matter is hot
C. Because particles can never stop moving
D. Because all matter is cold
Answer:
The answer is C. Because particles can never stop moving
Explanation:
"All matter has thermal energy, even matter that feels cold. That's because the particles of all matter are in constant motion and have kinetic energy."
Under what conditions do you expect hydrogen gas to deviate from ideal gas behavior? Explain your answer.
what is the chemical formula for Salt and hydrogen gas?
Sodium carbonate (Na2CO3) reacts with acetic acid (CH3COOH) to form sodium acetate (NaCH3COO), carbon dioxide (CO2), and water (H2O). A chemist carries out this reaction in a bomb calorimeter. The reaction causes the temperature of a bomb calorimeter to decrease by 0. 985 K. The calorimeter has a mass of 1. 500 kg and a specific heat of 2. 52 J/g•K. What is the heat of reaction for this system? kJ.
Explanation:
Mass of bomb calorimeter, m = 1.5 kg = 1500 g
Temperature change of calorimeter, ΔT = - 0.985 K
Specific heat of calorimeter, c = 2.52 J/g K
To Find:
The heat of reaction for this system
Calculation:
The heat of reaction can be calculated by the given formula:
Q = mcΔT
⇒ Q = 1500 × 2.52 × (- 0.985)
⇒ Q = - 3723.3 J (-ve sign shows heat is given by calorimeter)
- So the heat of reaction is -3723.3 J or -3.7233 kJ
Taking into account the definition of calorimetry, the heat of reaction for the system is -3,723.3 J or -3.7233 kJ.
In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
In this way, between heat and temperature there is a direct proportional relationship.
The constant of proportionality depends on the substance that constitutes the body and its mass, and is the product of the specific heat by the mass of the body.
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case, you know:
Q= ? c= 2.52 [tex]\frac{J}{gK}[/tex] m= 1.500 Kg= 1500 g ΔT= -0.985 K is negative because the temperature decreases.Replacing in the expression to calculate heat exchanges:
Q= 2.52[tex]\frac{J}{gK}[/tex]× 1500 g× (-0.985 K)
Solving:
Q= -3,723.3 J= -3.7233 kJ
Negative sign shows heat is given by calorimeter.
In summary, the heat of reaction for the system is -3,723.3 J or -3.7233 kJ.
Learn more abour calorimetry:
brainly.com/question/11586486?referrer=searchResults brainly.com/question/24724338?referrer=searchResultsPlease help
How do we read chemical formulas?
Answer:
Download Science All formulasExplanation:
Hope it helpsWhich description is not a property of an acid?
1. Slimy feel
2. Corrosive
3. Sour taste
4. Dissolves metals
Answer:
Slimy Feel
Explanation:
Acid usually doesn't have a Slimy Feel to it.
Between what two elements does hydrogen bonding occur?
Answer:
it can occur between hydrogen and 3 other elements
Explanation:
These elements are:
Nitrogen
Oxygen
Flourine
How many moles of aluminum are needed to react completely with 2.1 moles of FeO? 2Al(s) + 3FeO(s) 3Fe(s) + Al2O3(s)
Answer:
1,4 mol
Explanation:
2 mol of Al reacts with 3 mol of FeO so for 2.1 mol of FeO you need 2 x 2.1 / 3 = 1.4mol
4. Pb + FeSO4 → PbSO4 + Fe
what type of reaction?
Oxidation- Reduction reaction
how do you find a mole (i need an example) i hate chem pls help
Answer:
I'm pretty sure its just the mass of the sample divided by the molar mass
for example if I had like 7g of carbon and wanted to find the moles, I would divide the mass I have (7g) by the molar mass (the atomic mass value on your periodic table, in this case for carbon it would be 14g)
moles = [tex]\frac{mass}{molarmass} = \frac{7}{14} = 0.5\ moles[/tex]
Hope this helped
Is this statement true or false?
A compound is a substance made of two or more elements joined in a chemical reaction.
true
false
The correct answer is False.
two samples of solids have similar reactivity with acids and similar densities. their masses and volumes, however, are not at all similar. is it possible that these are the same substance?
Given that the volume and mass of a substance are not defining properties, it is entirely possible for two samples with different volumes and mass to be the same substance.
What are defining properties of a substance?These are properties that can help us to identify a substance. The most useful of which tend to be chemical properties such as reactiveness or melting points. Colors and density can also offer the insight needed to identify elements and substances. Mass and volume are not properties of a substance given that they can change often depending on the sample size and thus do not help to identify a substance.Therefore, since the volume and mass of a substance are not defining properties of a substance, we can confirm that it is entirely possible for two samples with different volumes and mass to be the same substance.
To learn more about properties of elements visit:
https://brainly.com/question/11838894?referrer=searchResults
What is the total amount of work done when Danny lifted 25 pounds of weight over 5 meters and applying 30- Newtons of Force?
Answer:
Definition and Mathematics of Work
Calculating the Amount of Work Done by Forces
Potential Energy
Kinetic Energy
Mechanical Energy
Question 24 of 25
How can one tell if a reaction is a redox reaction?
O A. Elements change phases.
O B. A precipitate is formed.
O C. Spectator ions are present.
O D. Electrons are gained and lost.
Answer:
D. Electrons are gained and lost
Explanation:
When electrons are gain and lost, redox reaction takes place. In redox reaction, reduction and oxidation tales place simultaneously. Therefore, option D is correct.
What is redox reaction ?Redox reactions include a change in the oxidation state of the substrate. When electrons are lost or the oxidation state increases, it is called oxidation; when they are gained or the oxidation state decreases, it is called reduction.
Redox reactions are those in which there is a change in the oxidation number, with both an increase and a drop in number. The reaction called non-redox if this does not take place.
Oxidation and reduction always occur jointly because any loss of electrons by one substance must be followed by a gain of electrons by another. Therefore, oxidation-reduction processes or simply redox reactions are other names for electron-transfer events.
Thus, option D is correct.
To learn more about redox reaction, follow the link;
https://brainly.com/question/13978139
#SPJ2
Which of the following methods will usually cause a reaction to speed up?
Group of answer choices
Removing the catalyst.
Combining the reactants at a lower temperature.
Grinding one of the reactants into a powder.
Reducing the concentration of reactants.
the method that will usually cause a reaction to speed up from the list given is: Reducing the concentration of reactants.
Meaning of ReactionReaction can be defined as the combination of substances or a process where substances acts on each other, where substances changes into different substances.
A reaction can be said to be the event that causes a restructuring or rearrangement of atoms of a substance when it is in contact with another substance.
In conclusion, the method that will usually cause a reaction to speed up from the list given is Reducing the concentration of reactants.
Learn more about Reaction: https://brainly.com/question/26018275
#SPJ2
Which molecule has ionic bond?
Mg
C0
NaCl
N0
NaCl - Chlorine has an outer shell with 7 electrons it wants to gain from the Sodium to become stable, whereas the Sodium wants to lose an electron to become stable.
Order the following elements according to the valence numbers from lowest to highest
1. Boron
2. Sodium
3. Chlorine
4. Beryllium
The percent of attacks on the dark-colored mouse models is how many times greater than the percent of attacks on light-colored models
The number of times the percentage of attacks on the dark-colored mouse is greater than the percentage of attacks on light-colored mouse is four (4) times.
Let the percent of attacks on the dark-colored mouse be D.Let the percent of attacks on light-colored mouse be L.Given the following data:
Light-colored mouse models = 20 percentDark-colored mouse models = 80 percentTo determine the number of times the percentage of attacks on the dark-colored mouse is greater than the percentage of attacks on light-colored mouse.
Therefore, we would simply divide the percentage for the dark-colored mouse by the percentage for the light-colored mouse as follows:
[tex]Number \;of\;times = \frac{D}{L}[/tex]
Substituting the given parameters into the formula, we have;
[tex]Number \;of\;times = \frac{80}{20}[/tex]
Number of times = 4 times.
Read more on percentage here: https://brainly.com/question/14432715
has anyone done 4.3.4 Practice: Mixtures of Matter...I need help :/
The types of mixtures are homogeneous and heterogeneous, you can identify these based on their features.
A mixture occurs when two or more materials are mixed or combined. For example, if you combine two or more liquids. Moreover, this can lead to two types of mixtures:
Homogenous mixtures.Heterogeneous mixture.Each of these has defined features that affect the characteristics and properties of a mixture:
Homogenous mixtures:
Once the mixture is done its components cannot be easily identified.The composition is uniform.Some examples include lemonade, smoothy, and concrete.Heterogeneous mixture:
The components can be easily identified and even separated after the mixture.The composition is not uniform.Some examples include salad, pizza and oil mixed with water.Note: This question is incomplete because of this, I answered based on general knowledge.
Learn more about mixtures in: https://brainly.com/question/24898889
I’m in science class right now and I need help on these questions
Answer:
hello
Explanation:
Why are polyatomic called radicals
When no more solute will dissolve in a solvent, the solution is_________.
Answer:
saturated solution because it can only dissolve upto fixed temperature
Answer:
Saturated
Explanation:
Explanation from online:
"When the solution equilibrium point is reached and no more solute will dissolve, the solution is said to be saturated. A saturated solution is a solution that contains the maximum amount of solute that is capable of being dissolved."
Stay Safe, and I hope this helps!!!!
The angle formed by the nuclei of two surrounding atoms with the nucleus of the central atom in a structure is called a(n) ________angle. The value predicted for such an angle using the VSEPR theory would be 180 degrees, based upon geometry alone. This is referred to as the___________ bond angle. In practice, this value often deviates from the predicted value for various reasons.
The bond angle obtained based on the geometry of the molecule alone is known as the predicted bond angle.
When a compound is formed, the less electronegative atom in the compound is called the central atom in the molecule. The angle formed by the nuclei of two surrounding atoms with the nucleus of the central atom in a structure is called a bond angle.
The bond angle is usually based on the geometry of the molecule. The expected geometry can be deviated for certain reasons such as the presence of lone pairs on the central atom in the molecule. The bond angle obtained based on the geometry of the molecule alone is known as the predicted bond angle.
Learn more about bond angle: https://brainly.com/question/6179102
What is the frequency of the above wave?
Answer: is a measurement of how often a recurring event such as a wave occurs in a measured amount of time
Explanation: