Answer:
250 cm³
Explanation:
V = l × w × h
V = (5) × (5) × (10)
V = 250 cm³
If the half-life of iodine-131 is 8.0 days, how much of a 100.0 mg sample of it will remain after 32 days? In case you're interested, iodine-131 forms xenon-131 by beta emission/decay. Please enter only a numerical answer and do not write in any units. It is understood that the unit is mg.
Given :
Half-life of Iodine , [tex]t_{0.5}=8 \ days[/tex] .
Initial concentration , [tex][A_o]=100\ mg[/tex] .
To Find :
The amount of sample remains after 32 days .
Solution :
Rate constant is given by :
[tex]k=\dfrac{0.693}{t_{0.5}}\\\\k=\dfrac{0.693}{8}\ s^{-1}\\\\k=0.086625\ s^{-1}[/tex]
Now , by rate law :
[tex][A]=[A_o]e^{-kt}[/tex]
Putting all given values, we get :
[tex][A]=100\times e^{-(0.086625)\times 32}\\[/tex]
[tex][A]=6.25\ mg[/tex]
Therefore , the remaining sample after 32 days is 6.25 mg .
Hence , this is the required solution .
how are protons and neutrons found?
Answer:
Electrons are found in shells or orbitals that surround the nucleus of an atom. Protons and neutrons are found in the nucleus. They group together in the center of the atom.
Explanation:
I'm not sure if this is correct but I hope this helps.
ANSWER QUICKLY PLEASE!!!
Explain how electron microscopes work and why some scientists might prefer to use electron microscopes instead of light microscopes.
Answer:
Electron microscopes differ from light microscopes in that they produce an image of a specimen by using a beam of electrons rather than a beam of light. Electrons have much a shorter wavelength than visible light, and this allows electron microscopes to produce higher-resolution images than standard light microscopes.
Explanation:
give an answer to questions 3 will give you 20 point ASSSAAPP
Answer:
Explanation:
1. It is five valence electrons.
2. It is four valence electrons.
3. It is six valence electrons.
4. It is two valence electrons.
I do hope I helped you! :)
Answer:
1. c
2. b
3. a
4.d
Explanation:
Help me find the answer please
Which of the items shown here will protect you from a chemical burn? Select all that apply.
A hand in a rubber glove.
A fire extinguisher.
A pair of glasses with clear shields attached on the sides.
A power source.
Answer:1 & 2
Explanation:
Answer:
A. The rubber gloves and C. the protective glasses
Explanation:
I just answered this question and it was correct.
Hope this helps!!!!
Please mark my answer the Brainiest!!!!!!
A(n) __________________ is a statement of what you think will happen during an investigation. It is often written in the form of an if... Then... Because statement. Group of answer choices
Answer:
Hypothesis. Hope this helped! :)
What is the definition of potential energy in physics?
Answer:
To summarize, potential energy is the energy that is stored in an object due to its position relative to some zero position. An object possesses gravitational potential energy if it is positioned at a height above (or below) the zero height.
Explanation:
I hope this helped
Question 4
These are the uncharged particle located in the nucleus. The number of these tha
atom has is equal to its mass number minus its atomic number.
1. Protons
2.Nuclei
3.Neutrons
4.Electrons
I really need help with this before 4:50
Your Uncle Danny just moved into a new apartment and wants to make his famous spaghetti sauce for his new
neighbors. Unfortunately, he hasn't unpacked all of his kitchen utensils. His recipe calls for ' a cup of
oregano, however he can only find a teaspoon to measure out his spices. How many teaspoons of oregano
would be the same as a cup?
Answer:
48 teaspoons
Explanation:
1 cup equals 48 teaspoons.
how does kinetic energy at the bottom of a hill compared to its potential energy at the top
Answer:
Kinetic energy would have to work ten times harder than potential energy.
Explanation:
Let’s say you have a boulder and your asked to push it up the hill it would be difficult right? But lets reverse the situation what if you are asked to roll the boulder down the hill it wouldn’t be much work because the hill is basically doing all the work For you. Hope this Helps:)
a 1 mL pipette delivers a measured volume of .98 mL (calculate the percentage error)
Answer:
2%
Explanation:
.98 is 98% of one and therefore they are missing 2%
Answer:
2%
Explanation:
The answer is 2%.
100-98 is 2.
A calorimeter made from a can is used to measure the calories in a peanut. During the experiment, the
measured calories were 35% of the true/accepted value given by references
Answer:
The heat generated per gram of sample in calories is 0.87 g
Explanation:
Given that,
A calorimeter made from a can is used to measure the calories in a peanut.
During the experiment, the measured calories were 35% of the true/accepted value given by references
Suppose, the mass of peanut is 0.4 g and find the
We need to calculate the heat generated per gram of sample in calories
Using formula of heat generated
[tex]q=\dfrac{q_{penut\ calorimeter}}{m_{peanut}}[/tex]
Put the value into the formula
[tex]q=\dfrac{0.35}{0.4}[/tex]
[tex]q=0.87\ g[/tex]
Hence, The heat generated per gram of sample in calories is 0.87 g
Question 26 (1 point)
Use the periodic table to determine which statement below is true of the element Bromine (Br).
•Bromine will lose 7 valence electrons to become a negative ion.
•Bromine will lose 7 valence electrons to become a positive ion.
•Bromine will gain 1 valence electron to become a negative ion.
•Bromine will gain 1 valence electron to become a positive ion.
Answer:
The correct option is;
Bromine will gain 1 valence electron to become a negative ion
Explanation:
Bromine can be found in period 4 in group 17 of the periodic table and is an halogen
The electron configuration of bromine can be presented as follows;
Electronic configuration 1s²2s²2p⁶3s²3p⁶3d¹⁰4s²4p⁵
Therefore, an atom of bromine has 2 + 5 or 7 electrons in its outermost shell, which makes it have one less electron to complete a full octet structure and therefore, bromine has a strong affinity for electron to complete its octet structure and it is thus a strong oxidizing agent.
When bromine enters into a chemical reaction and gains the one valence electron it becomes a negatively charged ion.
The main group elements exclude which parts of the periodic table?*
1 point
Transition metals and lanthanide metals
Alkali metals and alkaline earth metals
Halogens and noble gases
Periods and families
How many blocks are found in the periodic table?
1 point
Answer:
Transition metals and lanthanide metals
Explanation:
Alkali metals, alkaline earth metals, halogens, and noble gases are all part of the main group elements.
Periods and families simply refer to the rows and columns of the periodic table. They don't specify the type of element.
In coulombs, how much positive charge is there IN a barium nucleus? On a barium ion?
Answer:
The amount of positive charge in a barium nucleus is approximately 8.972 × 10⁻¹⁸ coulomb
Explanation:
The amount of positive charge there is in a barium nucleus is found as follows;
The atomic number of an element is equal to the number of proton present in the atom
The atomic number of barium = 56 = The number of protons in an atom of barium
The positive charge of a single proton is known as an elementary charge, e, given by the formula, e = F/N[tex]_A[/tex]
Where;
F = Faraday's constant
N[tex]_A[/tex] = The Avogadro's number
Therefore, e = 1.602 176 634 × 10⁻¹⁹ C
Which gives the positive charge, Q, of the protons of a barium nucleus as follows;
Q = Number of protons × e
Q = 1.602176634 × 10⁻¹⁹ × 56 ≈ 8.972 × 10⁻¹⁸ Coulomb per atom of barium.
The amount of positive charge in a barium nucleus ≈ 8.972 × 10⁻¹⁸ coulomb.
how to calculate molecular mass?
What do you think of the word matter?
Answer:
matter is any substance that has mass and takes up space by having volume. ...
1. Measuring instruments, such as rulers and graduated cylinders, are often used in experiments to increase the A clarity of the hypothesis B. testability of the hypothesis C. accuracy of the data sample size of the data 5
Answer:
C. accuracy of the data sample size of the data
Explanation:
Measuring instruments, such as rulers and graduated cylinders, are often used in experiments to increase the accuracy of the data sample size which is usually gotten from the taken reading.
Measuring instruments such as rulers have accurate readings which makes measurements in any form very easy and more accuracy.
what is hydraulic pressure?
2. If an eagle is flying at a constant speed, it is accelerating. True or
False
Answer:
False
Explanation:
Answer:
:0
Explanation:
Wich tools are appropriate to determine the densety of an irregular-shaped object ?
Answer:
The most accurate way to determine an object's volume, especially in the case of an irregularly shaped object, is to immerse it in water and measure the amount of water it displaces. A graduated cylinder large enough to hold both the object and enough water to fully immerse it is the best tool for this job.
Which statement best compares and contrasts lipids and carbohydrates?
Both are used for energy storage, but only carbohydrates are used for long-term energy storage,
Both are used for energy storage, but only carbohydrates are used for short-term energy storage.
Both are used for tissues, but only carbohydrates are used for tissue growth.
Both are used for tissues, but only lipids are used for tissue growth.
Answer:
The answer is B
Both are used for energy storage, but only carbohydrates are used for short-term energy storage.
Explanation:
hope it helps
got it right on edge
i just submitted it and got it right
Both are used for energy storage, but only carbohydrates are used for short-term energy storage.
MACROMOLECULES:
Macromolecules are large or complex molecules made up of monomers. The macromolecules in nature are as follows: proteins, carbohydrates, lipids and nucleic acids. Each macromolecule performs specific functions in the body and hence, are very important. Carbohydrates and lipids are used as energy storage, however, lipids store energy in the body for a long term than carbohydrates. Carbohydrates store energy for a short term because they are readily used by the body.Therefore, both macromolecules are used for energy storage, but only carbohydrates are used for short-term energy storage.
Learn more: https://brainly.com/question/14920584?referrer=searchResults
1)petroleum and natural gas are formed in the__________
2)_______ refers to the things that exists freely in nature or human use
3) during the ____ period the earth was covered with swampy forest's
4)-------- is the mixture of hydrogen, methane, carbon monoxide, and other gases
5)natural gas mainly consists of_____
6)_____are the chemicals derived from petroleum and natural gas
7) the process of refining of petroleum is carried out in refineries and is called _____
8) _____ is used to generate power and to manufacture other fuels like coke and coal tar
Explain why the design of the bird's nest in the picture provides good insulation for the eggs.
Answer:
First, the lining may consist of loose, smaller bits of the same materials that have been incorporated into the latticework of the nest. These finer materials are utilized to shed water, deter pests, conceal the eggs from predators, insulate, and cushion them. ... They also serve to insulate and cushion the eggs.
Explanation:
A liquid has a density of 0.70g/ml. Find the mass of the liquid which can be put
into a beaker holding 130mL.
Answer:
The answer is
91 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
density of liquid = 0.70 g/mL
volume = 130 mL
The mass is
mass = 0.7 × 130
We have the final answer as
91 gHope this helps you
what is the name of that equipment she is using
Answer:
picture?
Explanation:
how do i convert 0.5L to mL
Answer: 500
Explanation: there's 0.001L in every mL. Divide the mL
by 1000 or multiply the liter by 1000.
If the block were to be cut in half, what would be the
density of the smaller block?
Answer:
Density stays the same
Explanation:
The density remains the same because cutting the object in half will divide the mass & volume by the same amount. Also, the density of a substance remains the same no matter what size it is.
1. The density of a substance is 4.8 g/mL. What is the volume of a
sample that is 19.2 g?
Answer:
d= 4.8g/mL
m= 19.2 g
V=m/d
V= 4 mL
Why does the copper(I) ion Cu+ have 10 3d electrons?