Answer:
Calculate the rate of decay constant for U-238 if its half-life is 4.468 × 109 years. Answer: If the problem is referring to the half-life, then the ratio of = 0.5 because half of the original sample has already undergone decay.
Explanation:
Calculate the amount of heat needed to evaporate 235.0 grams of water from 25.0°C to 100.0°C.
question is
P2O5 a ionic or covalent bond, its covalent right?
Answer:
Covalent
Explanation:
A general clue that a compound is covalent is two nonmetallic elements bonded together. There is the sharing of electrons but no transfer or formation of ions like there is in ionic bonding.
In what way do the atoms in the same row of the Periodic Table increase from left to right?
Answer:
As you move from left to right, the nucleus gains protons. This increases the positive charge of the nucleus and its attractive force on the electrons. At the same time, electrons are added to the atoms as you move from left to right across a period.
Explanation:
FISICOQUIMICA HIDROSTATICA
Scientists digging in a cave found an unknown substance. The scientists
found that the substance’s molecules were moving around each other. The scientists
increased the speed of the substance’s molecules and caused a phase change. How
did the scientists do this, and how did this affect the substance?
Answer:
By adding heat energy
It became a gas
Explanation:
The molecules moving about another is a clear indicator that the substance is a liquid.
In a liquid, the molecules stick together and move about one another.
When the scientist increase the speed of the of substance, the kinetic energy increases. if this increase causes a phase change, then the substance becomes a gas. So, by adding heat energy a substance becomes gaseous if it is a liquid already.Scientists changed the genes of a tomato plant in order to produce a protein which is a natural pesticide. Why would this be classified as a positive mutation?
Answer:
The plant would be insect-resistant and improve its chances of success.
Explanation:
A substance has a molecular formula of C8H10N4O2
The empirical formula of a substance = C₄H₅N₂O
Further explanationThe empirical formula is the smallest comparison of atoms of compound forming elements.
A molecular formula is a formula that shows the number of atomic elements that make up a compound.
(empirical formula) n = molecular formula
((empirical formula)n=C₈H₁₀N₄O₂
divide by 2 :
(C₄H₅N₂O)₂=C₈H₁₀N₄O₂
Darwin told us that science:
saves lives
Answer:yup!!
Explanation:
(?)Li2O + (?)H2O → (?)LiOH
what goes inside the question marks?
Answer:
(1)Li2O + (1)H2O → (2)LiOH
Hope this helps!
Suzanne has a cat and uses a pet carrier to take her cat to the veterinarian. After a few years, the cat runs away and hides every time Suzanne gets the carrier out. Which best describes the cat's behavior? instinct reflex conditioned imprinting
Answer:
conditioned
Explanation:
The best term to describe the behavior of the cat is conditioned.
The cat has been conditioned to respond in a specific way to the pet carrier over time due to certain experiences - most likely, unpleasant ones. With repeated unpleasant experience associated with the per carrier, the cat has been conditioned to dislike/fear the pet carrier and thus, the recorded behavior.
Answer:
conditioned
Explanation:
The diagram below shows a longitudinal wave at one instant in its motion. Each oval represents a particle acted on by the energy of the wave as it moves from left to right.
Which line on the diagram indicates a region of rarefaction?
Answer:
Here now you can give the other person the brainly they deserve and they were right too :)
Explanation:
The line that has been the representation of the region of rarefaction in the diagram has been the line below the top line.
The diagram has been the representation of the movement of the particles under the influence of wave energy. The particles have been moving from left to right in the longitudinal order with a gain of energy.
The rarefaction has been the instance where the density of the waves has been lesser or where there has been one wavelength of the wave.
The diagram has been representing, at the line below the top arrow, there have been lesser density of the wave particles, thus, the region of rarefaction has been the instance in the lines below the top line.
For more information about the rarefaction, refer to the link:
https://brainly.com/question/1326823
Can someone help me please will give BRAINIEST
Complete the conversions for the following temperature measurements:
55.3C=_____K
255K=_____C
447K=_____C
-14C=_____K
Answer:
55.3 = 328.45k
255 = 18.15°c
447 = 173.85°c
-14 = 14k
HELLLLPPPPPPP
Which of the following is the correct term for the chemical reaction that forms polymers?
A. Displacement
B. Oxidation
C. Polymerization
D. Monomerization
how can you find the Frequency if you only have the wavelength? can you solve this example what is the Frequency of the wavelength 4km? can you please show your steps thanks.
Answer:
75000 Hz
Explanation:
f = V / λ (f= frequency, v=velocity of wave, lambda= wavelength)
alternatively, f = c / λ (f= frequency, c= speed of light- 3.00x10^8 m/s, lambda= wavelength)
f= [3.00x10^8 m/s]/[4000 m]
=75000 Hz
Which of the following is an extensive property of a sample of aluminum?
Answer:
Entropy,mass and volume.... I think
Mass is the extensive property of a sample of aluminum. Therefore, option (A) is correct.
What is the extensive property of matter?The extensive property can be described as a physical property of matter that changes with a change in the size and shape of the matter. Therefore, the extensive property of any substance varies directly with the mass.
Extensive properties are the value of the property of the system that must be equal to the sum of the values of different parts of the system. These properties depend on the amount of matter contained in the system.
Examples of Extensive properties are temperature, pressure, density, boiling point, etc. The ratio of the two extensive properties is an intensive property such as density.
The mass of a sample of aluminum is an example of extensive property as it depends on the amount of aluminum in the given sample. This property of the sample is proportional to the size of the system.
Learn more about the extensive property, here:
https://brainly.com/question/13733851
#SPJ6
Your question is incomplete, most probably the complete question was,
Which of the following is an extensive property of a sample of aluminum?
A) Mass
B) Temperature
C) Pressure
D) Density
HELP ME PLEASE!! If given a graduated cylinder, a beaker with alcohol and a scale, explain the steps to find the mass of 40 mL of alcohol.
In general, some people equate mass and weight.
Mass is one of the principal quantities, which is related to the matter , whereas weight is a force that leads to the center of the earth (Earth's gravitational force)
Steps that can be taken to find the mass :
1. Weigh graduated cylinder (empty) 2. Pour the alcohol in the beaker into the graduated cylinder to the level of 40 ml 3. Weigh again graduated cylinder + poured alcohol 4. mass of alcohol 40 ml = mass in 3rd step - mass in the first stepcalculate the weight of 5 atoms of Mg.
Answer:
2.0179701e-22
Explanation:
Find the molar mass for NaNO3
Molar mass
= Atomic mass of Na + Atomic mass of N + Atomic mass of O3
= 23 + 14 + (16×3)
= 23 + 14 + 48
= 85 g per mole
what is always true of a week acid??????
A) It only partially dissociates in solution.
B) It does not dissolve in water.
C) It contributes only one proton.
D) It has been diluted with water.
Answer:
I'm pretty sure it's A
Explanation:
Answer:
for the a p e x quiz:
it dissociates completely in solution.
Explanation:
a p e x
Milk of Magnesia is a type of medication people can take to help with heartburn and indigestion cause by stomach acid.
If the pH of this solution is 10.5, which phrase would correctly describe Milk of Magnesia?
This substance would turn blue litmus paper to red.
This substance will likely taste sour.
This substance is acidic.
This substance is basic.
Answer:
This substance is basic.
Explanation:
The milk of Magnesia, a type of medication which can help people with heartburn and with a pH of 10.5 is a basic solution.
Bases are certain metallic oxides, metallic hydroxides and aqueous ammonia. They have the following properties: On the pH scale, they have a value between 7-14They turn red litmus paper blue. Bases are electrolytes. They have a bitter taste. They are soapy or slippery to feel.draw out the following covalent molecules
Answer:
you did not show the whole page
Explanation:
What percent of a human cell is made of macromolecules?
Answer:
About 70 percent. I hope this helps :)
What type of ions do nonmetals naturally form?
Answer:
Negative Ions
Explanation:
Nonmetals naturally form Negative Ions by gaining electrons to fill the valence shell
why chemical reactions are important to society?
Which option is a compound?
Examples of compounds include table salt or sodium chloride , sucrose (a molecule, nitrogen gas, a sample of copper, and water.
check wether all the answers are correct or not. please?
Answer:
H2+NO3=HNO3
Explanation:
becuase HNO3
The formula for one molecule of sucrose is shown below.
C12H22011
How many atoms in all are in one molecule of sucrose?
Answer:
45
Explanation:
There are 12 Carbons
There are 22 Hydrogens
There are 11 Oxygens.
I think the answer is either 0 or 45. But the wording is very sloppy. It is not really atoms that are present. There are ions.
Go with 45 but hold your nose when writing your answer.
Which event most likely occurs at point V?
cooling
erosion
heating
melting
Answer: cooling
Explanation:
Answer:
cooling
Explanation:
Which of an atom's electrons are inrolved in chemical reactions?
Answer:
Electrons at the outermost energy level of an atom are called valence electrons. They determine many of the properties of an element. That's because these electrons are involved in chemical reactions with other atoms. Shared electrons bind atoms together to form chemical compounds.
Explanation:
Answer:
electrons farthest from the nucleus of the atom. they are called valence electrons
what is the function of the cell membrane?
Answer:
Its the thin lining around the cell the moniters what gets in and out of the cell.
Explanation: