Answer:
The correct option of the first option
Explanation:
Dissolution of a solute in a solution is the process in which the solute interacts with the solvent leading to the disappearance of the solute to form a solution. Rate of dissolution is primarily affected by three factors namely
Stirring of the solution: Stirring the solution causes the solute to interact more with the solvent, thus increasing the rate of dissolution.
Surface area of the solute: The smaller the surface area of the solute, the more easier it is for it (the solute) to interact with the solvent. Hence, the smaller the surface area, the faster the rate of dissolution.
Temperature of the solvent: An increase in temperature of the solvent causes the generally causes more things to dissolve in this solvent due to increased energy of molecules in the solvent, which causes the molecules of the solute and solvent to interact more.
A decrease in the amount of solute will reduce the amount of interaction the solute (since it is in lesser quantity) have with the solvent hence the rate of dissolution will also be low (even though a solution will still be formed).
There are different factors that influences chemical equations. The factor that causes a decrease in the rate of dissolution is decreasing the surface area of the solute.
Dissolution rate is simply known as the transfer rate of some specific drug molecules from the solid particles which is usually crystalline in nature into solution as self free drug molecules. The rate of Dissolution can be determined by the forces of the crystal.Surface area is known to affect the rate of dissolution. Note that When the total surface area of the solute particles is increased, the solute will then dissolves more quickly than ever.
The breaking of a solute into smaller pieces in turn do increases its surface area and increases its rate of solution and the act of stirring, do allows the solute to dissolve faster.
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Which of the following statements concerning the sample size of an experiment is not accurate?
A. A smaller sample size decreases confidence in the accuracy of a study.
B. A larger sample increases confidence in the accuracy of a study.
C. A smaller sample size increases generalizability of a study
D. A larger sample increases generalizability of a study.
Answer:
It's actually C. A smaller sample size increases generalizability of a study
Explanation:
PSYCHOLOGY All of the following physical reactions occur when our fight-or-flight response is triggered except __________. A. dilating pupils B. increasing heartbeat C. increasing digestion D. increasing perspiration
Answer:
C.) increasing digestion
Explanation:
hope this helps:)
Answer:
C. increasing digestion
Explanation:
Which statement best describes how the use of gasoline in a car relates to the discipline of chemistry?
The materials used come from the ground,
The gasoline undergoes a change as it burns
A car uses the gasoline to move
All parts of the car are composed of chemicals.
Answer:
The gasoline undergoes a change as it burns.
Explanation:
Just took the Unit Test review ((:
Answer:
b
Explanation:
because i said so brudda
6) A giraffe walked 1 mile in 15 minutes. Find the unit rate. O A. 1 mi/15 min O B. 15 mi/min O C. 0.06 milmin 0 D. 2 mi/30 min
Answer:
1 mil/ 15 min
A giraffe walked 1 mile in 15 minutes. So the unit rate for it will be 1mil/ min.
What is the unit?
Unit is some standards to measure the physical quantity of an object. There are two unit systems as SI unit and the CGS unit.
There are standard six quantities which have units :
Kilogram is the unit of mass.second is the unit of time.Meter is a unit of length.Ampere is the unit of current.Kelvin is the unit of temperature.Mole is the unit of the amount of substance.Apart from this, some quantities have derived units. These quantities are force, energy, and power.
In the given question, the giraffe walked 1 mile in 15 minutes, therefore
Walking distance of giraffe= 1mile/ 15 min.
Therefore, A giraffe walked 1 mile in 15 minutes. So the unit rate for it will be 1mil/ min.
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Cats are aliens, sent to spy on us. Is this statement about cats a scientific theory? Explain your answer, including whether you can provide evidence to support the statement.
Answer:
No, it's not a scientific theory because it has no merit or evidence to support that claim.
Explanation:
How many protons in an atom of beryllium
Answer: 4
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A rod of iron of uniform density has a thickness such that a one-inch-long segment of it weighs 3.88 ounces. Given that there are 0.035273 ounces in a gram and 2.54 centimeters in an inch, how many grams would a 14.79 cm length of the same iron rod weigh?
Answer:
Weight of 14.79 cm rod of iron = 640.51 gram (Approx)
Explanation:
Given:
Weight of 1 inch rod = 3.88 ounce
1 inch = 2.54 centimetre
1 gram = 0.035273 ounce
Find:
Weight of 14.79 cm rod of iron
Computation:
Weight of 14.79 cm rod of iron = 14.79[3.88/{(0.035273)(2.54)}]
Weight of 14.79 cm rod of iron = 57.3852 / 0.08959342
Weight of 14.79 cm rod of iron = 640.5068
Weight of 14.79 cm rod of iron = 640.51 gram (Approx)
Answer:
640.51 gram
Explanation:
on edg
Which of these would have lowest kinetic energy
Boiling water
Ice water
Refrigerated water
Water at room temperature
Answer:
The answer is ice water, since the particles of a solid have very low kinetic energy.
Explanation:
Answer:
Iced water.
Explanation:
It's a solid. Within a given substance, such as water, particles in the solid state have the least amount of kinetic energy.
As water freezes, it does so because after thermal energy leaves the particles, the average translational+rotational kinetic energy decreases, but the total average kinetic energy does not... and the temperature does not change either.
Which best explains how photosynthesis is helpful to humans? It reduces the amount of harmful rays released by the sun. It increases the levels of carbon dioxide in the air. It provides oxygen for humans to breathe. It produces proteins, which humans can eat.
Answer:
it provides oxygen for the human to breathe
Explanation:
During photosynthesis plants absorbs carbon dioxide from the atmosphere and release oxygen into the air. Hence, it increases the level of oxygen for breath.
What is photosynthesis?Photosynthesis is a biological process by which green plants produce energy and molecular oxygen in leaf by the aid of light energy. The photoactive pigments chlorophyll in green leaves absorbs light energy sufficient for this process.
The photosynthetic reaction involves combination of carbon dioxide and water to form glucose and oxygen as written below:
[tex]\rm 6H_{2}O + 6CO_{2} \rightarrow C_{6}H_{12}O_{6} + 6O_{2}[/tex].
Therefore, photosynthesis decrease the level of carbon dioxide and increase the level of oxygen in the air . Thus, plant biomass helps us to provide oxygen to breath.
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Which of these is an example of an abiotic factor?
What are the choices? I'll answer once you tell me those
Answer:
sunlight is an abiotic factor
Explanation:
If Argon has a mass number of 40 and an atomic number of 18, how many electrons does a
neutral atom contain?
A.40
B.20
C.22
D.18
Members of group # ___ do not form ions or react with other elements.
Answer:
VIIA group donot form ions or react with other elements. This group is also called noble gases or inert gases which donot take part in chemical reaction.
this is an earth and space question worth 46 points plz answer Edwin Hubble was an American astronomer who pioneered the exploration of what type of space.
Answer:
He made human race know there were other galaxies in this universe
1. The term _________
refers to the chemical potential of hydrogen.
Answer:
PH
Explanation:
Answer:
Explanation:
pH but i'm really not sure
What is the main source(s) of energy for all living things?
Answer:
The sun
Explanation:
All living things get energy from different sources (a cow gets it from grass, dog gets it from meat), but eventually, most energy on Earth comes from the Sun. Plants use it to perform photosynthesis, other organisms eat plants, and so on!
The compound M-O-H can act both as acid or base depending upon the ionisation
enthalpy of the element M. Justify by taking elements (M) of the third period of the
periodic table.
action
Answer:
Explanation:
A compound that can act both as an acid and a base is called an amphoteric substance. A good example (based on the question) of an amphoteric substance is the Aluminium hydroxide [Al(OH)₃] where Aluminium is the "M" in M-O-H. Aluminium is in the third period of the periodic table. The reaction below shows aluminium can act both as an acid and as a base in different neutralization reactions.
As an acid
Al(OH)₃ + 3NaOH ⇒ Na₃AlO₃ + 3H₂O
As a base
3HCl + Al(OH)₃ ⇒ AlCl₃ + 3H₂O
NOTE: A neutralization reaction is a reaction between an acid and a base to give you salt and water
Why do nuclear fusions release energy?
Answer:
The release of energy with the fusion of light elements is due to the interplay of two opposing forces: the nuclear force, which combines together protons and neutrons, and the Coulomb force, which causes protons to repel each other.
Question 2 of 10
Which of these is not an example of how engineering has affected society?
O A. The seven-mile bridge that spans across the Gulf of Mexico to
connect two cities of the Florida Keys
O B. The Hoover Dam, which was built to prevent floods, provide
irrigation, and produce hydroelectric power
O c. The use of piers and beams used to build a strong foundation for
a house
D. Our understanding of how cancer cells grow and spread
Answer:
D. Our understanding of how cancer cells grow and spread
Which of the following statement(s) are true about the atoms of any element?
a) The number of protons in an atom of an element is unique to each element.
b) The number of protons and neutrons in an atom of an element is unique to each element
c) A proton in an atom of one element is identical to a proton in an atom of another element.
d) The number of protons in an atom of an element is the same for all elements.
Answer:
C
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Please check my chem answers! Due in a few minutes!
Answer:
their correct
Explanation:
your answers are correct
3
Write the alpha decay WITH gamma emission for the following element:
92
AL
27
Answer:
Explanation:
In alpha decay alpha ray comes out . Apha ray is nothing but nucleus of helium atom whose atomic no is 2 and atomic weight is 4 . Hence in alpha decay , atomic weight reduces by 4 and atomic no reduces by 2. For gamma emission , there is no change in atomic number and atomic mass.
⁹²₂₇AL ⇒ ⁸⁸₂₅X + ⁴₂He + γ
X is Manganese .
Write in a scientific notation 234.5398
Answer:
the answer is 2.34 x 10^2
As the frequency of electromagnetic waves increases, what happens to the wavelength?
O It increases.
O It decreases
It fluctuates.
O It remains constant.
Answer:
It decreases.
Explanation:
As the frequency of electromagnetic waves increases, the wavelength decreases.
What is frequency?Frequency defines the number of waves passing through a fixed area over a period of time. So if the time we take for the wave to pass is 1/2 second, it is usually 2 per second. If it takes 1/100 of an hour, it is usually 100 per hour.
What is an example of frequency?The definition of frequency is how often something happens. An example of blinking an eye blink 47 times in one minute. (physics) The degree to which a recurring event occurs, such as a full-wave cycle.
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which shows as evidence for a scientific claim. A- surveys of public opinion B- company advertisments C-controlled experiments D- personal websites
Answer:
A
You do not know if the advertisement is lying to you. Controlled experiments will be biased and personal websites will say what they think, not following the data & science.
Atoms contain positive, negative, and neutral. what happens when two positively charged particles are close together?
A.They repel each other
B.They cancel each other
C.They attract each other
D.They have no effect
Answer:
they repel each other
Explanation:
A is the ans
In cooking or preparing food and drink, when have you observed solubility in action?
Answer:
Making lemonade with powder: The flavored powder is soluble and will dissolve into the water.
Explanation:
how many valence electrons are in the element gallium? explain how you determined the number.
Gallium has three valence electrons.
Elements in the periodic table are classified into groups and periods. Elements in a given group have the same number of valence electrons on their outermost shell while the elements in a period have the same number of shells.
All the elements in group 13 have three electrons in their outermost shell. Gallium is an element of group 13. This means that gallium also has three electrons in its outermost shell(valence electrons).
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Gallium has 3 valence electrons (1 electron in the 4p orbital and 2 electrons in the 4s orbital) because the valence electrons are those located in the outermost energy level of an atom.
Gallium has an atomic number of 31, which means it has 31 electrons in total. The electron configuration of gallium can be represented as [Ar] 3d¹⁰ 4s² 4p¹.
Within the n=4 shell, gallium has electrons in the 4s and 4p orbitals. The 4s orbital can hold a maximum of 2 electrons, while the 4p orbital can hold a maximum of 6 electrons. In the case of gallium, there is 1 electron in the 4p orbital.
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A student performs the following experiment.
Step 1: she pours a colorless solution into a beaker that contains another colorless liquid. Yellow particles appear in the liquid.
Step 2: she lets the yellow particles settle in the beaker and then separates the colorless liquid by decantstion.
What most likely occurred in the beaker?
Answer: A chemical change in step one and a physical change in step two. ( So A) on edu
Explanation:
Answer:
A. a chemical change in step 1 and a physical change in step 2
Explanation:
Correct on Edge 2022!!!
Good luck everyone, you got this! Have a great day!
Eva buys a package of food, and the nutrition label says that one serving is equal to 36 grams and has 110 Calories. However, the box is printed with a label that says 0.150 pounds. If Eva eats the whole package, how many Calories will she have consumed?
Answer:74844
Explanation:
Answer:
208
Explanation:
(110 calories × 68.04 grams) ÷ 36 grams
= 208 calories
Got it right on my assignment
Which of these can be described as a system of stars, gases, dust, and other matter that orbits a common center of gravity?
A.) nebula
B.) asteroid
C.) galaxy
D.) planet
The galaxy is defined as a system of stars, gases, dust, and other matter that orbits a common center of gravity. Thus the correct option is C.
What is a galaxy?A galaxy is generally defined as the massive collection of billions of stars with their solar systems, gas and dust all guarded together by the center of gravity.
It is in the planet earth which is the part of our solar system we all live. The solar system is found to be the part of the galaxy called Milky Way. Our milky way galaxy also contains a supermassive black hole in the center.
There are several types of galaxies which are present in different shapes. Some of them are found to be in spiral shape and some other galaxies are seen as oval shaped and they are known as elliptical galaxies.
There are also some galaxies with irregular shapes and they are seen as blobs. It is the stars that are present inside each galaxies produces light and this massive system comprising of stars, dust gases and the matter are held by the gravity.
Thus the correct option is C- galaxy.
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