Answer:
It is called catalyst.
Answer:
A catalyst
Explanation:
is a substance that can alter the rate of a chemical reaction. Catalysts can be successfully used to increase the rate of a chemical reaction.
what are the possible values for standard temperature and pressure
Answer:
0 °C and 1 Atm,
Explanation:
Standard Temperature and Pressure. Standard temperature is equal to 0 °C, which is 273.15 K.
Standard Pressure is 1 Atm, 101.3kPa or 760 mmHg or torr
PLEASE HELP ME ASAP WITH THIS QUESTION!
Which factors describe a Mediterranean climate? Check all that apply.
has very few trees
is found in inland areas
has cool and rainy winters
has little to no precipitation
has dense shrubs and grasses
Answer:
has very few trees
has cool and rainy winters
has dense shrubs and grasses
Explanation:
I've done this before! Good luck!
which of the following is the most accurate description of all known spaces
Answer:
where are the following??
like anything? any animal?
Explanation:
Answer:
vevaeeav
Explanation:cx fsbtenet
What does a dissolved salt look like?
A. The salt crystals are surrounded by water molecules.
B. The salt crystals separate into salt molecules in the water.
C. The salt separates into ions that settle to the bottom
D. The ions in the salt are surrounded by water molecules.
Answer:
I want to say your answer is B)
The answer is D because the ions in the salt will be surrounded by water molecules
Dissolution in water occurs as a result of ionic interactions. This means that the ions (charged atoms) of the solute has to interact with the ions of water for the solute to dissolve. Based on this principle, only polar compounds can dissolve in water.
According to this question, salt is polar because it contains positive (+) and negative (-) ions. Hence, when placed in water, these ions will interact with the ions of water i.e. H+ and OH-. This causes dissolution of salt in water to form salt solution.
Hence, a dissolved salt will look like "ions in the salt are surrounded by water molecules".
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Examine the nuclear reaction: H+ón– H. Why is this classified as a nuclear reaction rather than a chemical reaction?
It is not balanced.
A new compound is formed.
A change has occurred in a nucleus.
A new element has been formed.
Answer:
A new compound is formed
High levels of carbon dioxide in the blood trigger which of the following responses in the body?
Select one:
a decrease in the production of sweat
a decrease in the speed of the pulse
an increase in the rate of breathing
an increase in the rate of digestion
how many Atoms of chlorine Cl are there in 3.45 mol Cl?
Answer:
2.078x10^24
Explanation:
No. of atoms of chlorine = 3.45 x 6.022x 10 ^23 x 1
= 2.078x10^24
( to find no. of atoms of, heres the formula i was taught No. of atoms = no. of moles x Avogadros constant x no. of atoms in the formula of compound)
What is the freezing point of a 2.00 m solution with phenol as
the solvent?
Answer: 26.1 C
Explanation: Trust me
Answer:26.1
Explanation:
I did the ck12
A 2.00 L container of nitrogen had a pressure of 3.20 atm. What volume would be
necessary to decrease the pressure to 1.03 atm?
Answer:
[tex]\large \boxed{\text{6.21 L}}[/tex]
Explanation:
The temperature and amount of gas are constant, so we can use Boyle’s Law.
[tex]p_{1}V_{1} = p_{2}V_{2}[/tex]
Data:
[tex]\begin{array}{rcrrcl}p_{1}& =& \text{3.20 atm}\qquad & V_{1} &= & \text{2.00 L} \\p_{2}& =& \text{1.03 atm}\qquad & V_{2} &= & ?\\\end{array}[/tex]
Calculation:
[tex]\begin{array}{rcl}3.20 \times 2.00 & =& 1.03V_{2}\\6.40 & = & 1.03V_{2}\\V_{2} & = &\dfrac{6.40}{1.03}\\\\& = &\textbf{6.21 L}\\\end{array}\\\text{The new volume must be } \large \boxed{\textbf{6.21 L}}[/tex]
What type of bond is formed during dehydration synthesis?
O A
carbon bonds between amino acids
B.
carbon bonds between carbohydrates
C. hydrogen bonds between lipids
O D. peptide bonds between amino acids
A carbon bond between the amino acids is formed in a dehydration reaction. So the correct option is A.
What is a dehydration reaction?
A reaction where two smaller molecules are combined in a chemical manner by the removal of an element from each of these molecules is called a dehydration reaction. Organic compounds are classified on the basis of structure. They are classified as aliphatic and aromatic compounds. Different kinds of chemical reactions are involved in the formation of new compounds when there is a change in bonding between the atoms.
There are some chemical reactions that form a molecule and some only show a displacement or substitution of atoms. There are synthesis or combination reactions that involve a combination of two substances to form one molecule.
On the other hand, there are decomposition reactions in which one substance decomposes to form more than one substance. There are displacement reactions which can be single or double displacement. They involve the displacement of one or more components of compounds among each other. Addition, substitution, rearrangement, elimination, and oxidation-reduction reactions are some of the common organic reactions.
Therefore, the correct option is A.
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As the temperature of a fixed volume of a gas increases, the pressure will _____. A. vary inversely B. increase C. decrease D. not change
Answer:
increases
Explanation:
As the temperature of a fixed volume of a gas increases, the pressure will increase.
What is Gay Lussac's law?
According to this law at constant volume of gas, pressure is directly proportional to the temperature of the gas and it is represented as:
P ∝ T.
It means that if pressure increases then temperature is also increases or if pressure decreases then temperature will also decreases.
So, pressure of the gas increases.
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the combustion of 0.1240 kg of propane in the presence of excess oxygen produces 0.3110kg of carbon dioxide what is the limittinf reacrant?
Answer:
Propane
Explanation:
From the question given, we were told that 0.1240 kg of propane reacted with excess oxygen to produce 0.3110kg of carbon dioxide.
Since the reaction took place in the presence of excess oxygen, therefore, propane is the limiting reactant as all of it is used up in the presence of excess oxygen.
Answer:
The limiting reactant is propane, C₃H₈ and the percentage yield is 83.77%
Explanation:
Mass of propane = 0.1240 kg = 124 g
Mass of carbon dioxide = 0.3110 kg = 311 g
Molar mass of propane = 44.1 g/mol
Molar mass of carbon dioxide = 44.01 g/mol
Number of moles of propane = 124/44.1 = 2.812 moles
Number of moles of carbon dioxide = 311/44.01 = 7.067 moles
Equation for the reaction
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
Hence 1 mole of propane ideally yields 3 moles of CO₂
Hence, 2.812 moles of propane will yield 3×2.812 moles = 8.44 moles of CO₂
Since, oxygen is in excess, therefore, the limiting reactant = Propane, C₃H₈
The percentage yield = 7.067/8.44× 100 = 83.77%.
When water changes into water vapor, this is called_______.
A) condensation
B) transpiration
C) precipitation
D) evaporation
Answer:
Evaporation
Explanation:
Evaporation turns liquid water into a gas called water vapor. If heat is taken away from water vapor, it condenses. Condensation turns water vapor into a liquid. If heat is taken away from liquid water, it freezes to become ice.
Answer:
D
Explanation:
Ummmm!! Can somebody please help me answer this question
Answer: is A because when the apple fell on him while he was thinking about the forces of nature he quickly studied it and sort of discovered it. That’s when he discovered gravity well it took him a while but he still did it. Hope it helped.
What is it called rocks are broken in smaller pieces
Answer:
weathering
Explanation:
if you are talking about how rocks get into smaller pieces
What improvements have been made in modern farming? Select all that apply.
1. machines can do more work over less time
2. better seeds sprout and grow much more quickly
3. trains can transport food over long distances faster
4. trains can transport the machines to rural farms once built
5. insecticides used to keep insects off the crops
Answer:
all of them except number 2
Explanation:
Answer:
1,3,4,5 the other perosn is correct
Explanation: That what my quiz said
Which organisms can digest cellulose? A. all animals that eat other animals B. most animals, including humans C. all plant-eating animals D. only a few kinds of microorganisms
Answer:
Animals such as termites and herbivores such as cows, koalas, and horses all digest cellulose, but even these animals do not themselves have an enzyme that digests this material. Instead, these animals harbor microbes that can digest cellulose.
(Hope this helps) Sky (I didn't choose the answer for you because I just gave you the most simplest hint to help you choose.)
The organisms that can digest cellulose are all plant-eating animals. That is option C.
What is cellulose?Cellulose can be defined as the type of polysaccharide that is found in the cell of plants and plant products.
They can be digested and broken down by the enzyme cellulase which is seen in plant eating animals.
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What happens when an object with elastic energy is released?
It uses kinetic energy to return to its original shape
It bounces like a ball
It uses potential energy to return to its original shape
It uses elastic energy to return to its original shape
Answer:
It uses kinetic energy to return to its original shape
Who first discovered the phenomenon of radioactivity?
Answer:
Antoine Henri Becquerel
Explanation:
Though it was Henri Becquerel that discovered radioactivity, it was Marie Curie who coined the term. Using a device invented by her husband and his brother, that measured extremely low electrical currents, Curie was able to note that uranium electrified the air around it.
Calculate the volume that 12.5 g of Co, gas will occupy at a
temperature of 40°C and a pressure of 1.20 atm.
The volume of the gas can be calculated using the ideal gas equation. The volume of 12.5 g Co gas at 40° C or 313 K and at 1.2 atm is 4.4 L.
What is ideal gas law?Ideal gas law is the combination of all the gaseous laws, relating the temperature, pressure, volume and number of moles of gas as written below:
PV = nRT
here, n is the number of moles and R be the universal gas constant equal to 0.082 L atm/ (K mol), T be the temperature in kelvin and p is the pressure in atm and finally v is the volume in L.
Given that the weight of Co is 12.5 g. Its atomic mass is 58.5. Thus number of moles of Co gas is 12.5/58.5 = 0.21 moles.
Now, apply the values of pressure, temperature and number of moles to the ideal gas equation as follows:
V = nRT/P
= (0.21 × 0.082 L atm/ (K mol) × 313 K ) /1.21 atm
= 4.49 L.
Therefore, the volume of 12.5 g Co gas at 313 K and at 1.2 atm is 4.49 L.
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Explain why many Lewis acids and bases are not classified as Arrhenius or Brønsted-Lowry acids and bases
Answer:
Lewis acids cannot have a hydroxide or hydrogen ion or donate a hydrogen ion, so they are neither an Arrhenius or a Brønsted-Lowry acid or base. Lewis bases will always be Brønsted-Lowry bases because they can accept a hydrogen ion.
According to Lewis concept ,Lewis acids cannot have hydroxide or hydrogen ion or donate a hydrogen ion, so they are neither an Arrhenius or a Brønsted-Lowry acid or base. Lewis bases will always be Brønsted-Lowry bases because they can accept a hydrogen ion.
What is Lewis concept?According to Lewis concept, Lewis dot structures are also called as electron dot structures and can be drawn if the molecular formula of a compound is known. It provides information regarding the nature of bond and the position of atoms .
They are also capable of exhibiting the lone pair if any present in a molecule or compound.Lewis defined a base to be an electron pair donor and an acid to be an electron pair acceptor.
They are capable of reflecting electronic structure of elements and even the pairing of electrons . In the diagram, each dot represents an electron while a pair of dots represent a bond between the atoms.
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A student wants to increase the magnetic force between two bar magnets. What should the student do?
A
Make the positive poles face each other.
B
Move the magnets farther apart.
C
Make the negative poles face each other.
D
Move the magnets closer together.
Answer:
Option "D" is the correct answer to the following question:
Explanation:
Magnets usually have their pulling properties, which we call magnetic power.
A major feature of magnetic power is that the closer the magnets are brought together, the higher the magnetic force increases.
On increasing distance, the magnetic force starts to decrease.
So, we can say that students should bring magnets closer to each other to increase the magnetic power.
A 52-gram sample of water that has an initial temperature of 10.0 °C absorbs 4,130 joules. If the specific heat of water is 4.184 J/(g °C), what is the final temperature of the water? (4 points) Group of answer choices 11 °C 19 °C 29 °C 51 °C
Answer:
28.98°C
Explanation:
Mass = 52g
Initial temperature (T1) = 10°C
Final temperature (T2) = ?
Heat energy (Q) = 4130J
Specific heat capacity of water = 4.184J/g°C
Heat energy (Q) = mc∇T
Q = heat energy
M = mass of the substance
C = specific heat capacity of the substance
∇T = change in temperature (T2 - T1)
Q = mc∇T
4130 = 52 * 4.184 * (T2 - 10)
4130 = 217.568 * ( T2 - 10)
4130 = 217.568T2 - 2175.68
217.568T2 = 4130 + 2175.68
217.57T2 = 6305.68
T2 = 6305.68 / 217.57
T2 = 28.98°C
Final temperature is 28.98°C
Which planet do scientists believe prevented the asteroids in the asteroid belt from forming a planet? Earth Jupiter Mars Neptune
Answer:
Jupiter
Explanation:
Jupiter prevented any planetary bodies from forming in the gap between Mars and Jupiter, thats why asteroids collide today.
sorry if its wrong .
Answer:
Your answer is Jupiter
Explanation:
I TOOK THE TEST AND I LEARNED THIS
Select the correct answer.
Which statement best describes the image?
A.
Ocean temperatures are relatively stable. During the day, the ocean cools the hotter air temperatures above land.
B.
Ocean temperatures are relatively stable. During the night, the ocean heats the cooler air temperatures above land.
C.
Ocean temperatures experience high fluctuations. During the day, the land cools the hotter air temperatures above the ocean.
D.
Ocean temperatures experience high fluctuations. During the night, the land heats the cooler air temperatures above the ocean.
Answer:
C.
Ocean temperatures experience high fluctuations. During the day, the land cools the hotter air temperatures above the ocean.
Explanation:
Generally ocean temperatures range from about -2o to 30o C (28-86o F). The warmest water tends to be surface water in low latitude regions, while the surface water at the poles is obviously much colder
C. Ocean temperatures experience high fluctuations. During the day, the land cools the hotter air temperatures above the ocean.
What is the hottest ocean temperature?The hottest ocean area is in the Persian Gulf, where water temperatures at the surface exceed 90 degrees Fahrenheit in the summer. Another hot area exists in the Red Sea, where a temperature of 132.8 degrees Fahrenheit has been recorded at a depth of about 6,500 feet.
What is a good temperature to swim in the ocean?A little cooler than your body temperature (98.6° Fahrenheit) should not be too cold so that you don't get chilled. 70° to 78° Fahrenheit is the range where most folks feel "comfortable" swimming.
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how many atoms are in 50 grams of calcium
The number of atoms in an elemental atom can be estimated by Avogadro's number or the number of equivalents. In 50 grams of calcium, there are 7.53 × 10²³ atoms.
What is Avogadro's number?Avogadro's numbers are used to estimate the number of smaller entities like the number of atoms and molecules in a compound for a substance. It determines the atom in a given mass of the atom. Avogadro's number (Nₐ) is equal to 6.022 × 10²³.
Given,
Mass of calcium = 50 gm
The molar mass of calcium = 40 gm/mol
The moles are calculated from mass and molar mass as:
Moles = mass ÷ molar mass
n = 50 ÷ 40
= 1.25 mol
It is known that a mole of a substance contains Nₐ atoms.
1 mol = 6.022 × 10²³ atoms
Then, 1.25 mol = 1.25 × 6.022 × 10²³
= 7.53 × 10²³
Therefore, there are 7.53 × 10²³ atoms in 50 grams of calcium.
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A calcium atom differs from a calcium ion in that the atom has a greater
A)
number of electrons
B)
number of protons
C)
atomic number
D)
mass number
Answer:
A) number of electrons
Explanation:
A calcium atom has 20 electrons while a calcium ion has 18 electrons since it loses 2 electrons to form a stable octet structure. The formula of a calcium ion is Ca2+.
The number of protons does not change, neither do the number of neutrons. Atomic number is the proton number which is equals to the number of protons, hence B and C is wrong. Mass number is the number of protons and neutrons. Hence it doesnt change too and D is wrong.
Only the number of electrons change when an atom forms an ion.
As the kinetic energy of particles of matter increase, the distance between the particles?
Identify the anode and cathode please
Answer:
anode is negative. cathode is positive.
11. Calculate the energy required to produce 12.00 mol of CI207 on the basis of the
following balanced equation.
2012(g) + 702(g) + 130 kcal yields 201207(9)
Answer: 780 kcal are required to produce 12.00 mol of [tex]Cl_2O_7[/tex]
Explanation:
Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and written along with reactants.
The balanced chemical reaction is:
[tex]2Cl_2(g)+7O_2(g)+130kcal\rightarrow 2Cl_2O_7(g)[/tex]
According to stoichiometry :
2 moles of [tex]Cl_2O_7[/tex] are produced by absorption of energy = 130 kcal
Thus 12.00 moles of [tex]Cl_2O_7[/tex] are produced by absorption of energy = [tex]\frac{130}{2}\times 12.00=780kcal[/tex]
Thus 780 kcal are required to produce 12.00 mol of [tex]Cl_2O_7[/tex]
