Answer:
40.06
Explanation:
(23 * 39) + (48 * 40) + (29 * 41)
100
= 40.06
formula:
(% of isotope A * mass of A) + (% of isotope B * mass of B) ......
100
Answer:
yes it can be broken down
What is the half-life of Technetium-99 if a 200 gram sample decays to 50 grams in 639,000 years?
Answer:
The half-life of Th-232 is 1.4 ∙ 10¹⁰ years.
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Answer:
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CONVERT 65 GRAMS OF OXYGEN TO MOLES.
IM CONFUSED !
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4 moles
64 grams of oxygen contains 4 moles
Answer:
4 moles
64 grams of oxygen contains 4 moles
Explanation:
A small amount of liquid bromine is added to a container which is then sealed.
Br2 (l) " Br2 (g)
Answer:
This answer is....
Br2 (l)
A brand of soda has one of the highest quantities of sugar among popular soda drink packing 52 grams into each 12 oz can how many molecules of sugar are in one can of this soda
Answer:
9.0 × 10²² molecules of sugar (sucrose)
Explanation:
Step 1: Given and required data
Mass of sugar in each can of soda (m): 52 gMolecular formula of sugar (sucrose): C₁₂H₂₂O₁₁Molar mass of sucrose (M): 342.3 g/molStep 2: Calculate the moles of sugar (n) in each can
We will use the following expression.
n = m/M = 52 g / (342.3 g/mol) = 0.15 mol
Step 3: Calculate the molecules corresponding to 0.15 moles of sugar
We will use Avogadro's number: there are 6.02 × 10²³ molecules in 1 mole of molecules.
0.15 mol × 6.02 × 10²³ molecules/1 mol = 9.0 × 10²² molecules
Which of the following is one principle of the cell theory?
(1 Point)
A. Animals are the only living things made of cells.
B. Plants are the only living things made of cells.
C. All living things are made up of one or more cells.
Answer:
One principle of the cell theory is that living things are made up of one or more cells.
Explanation:
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Answer:
a
Explanation:
If the temperature of a gas is 27.0°C when the volume is 1.25 L, what will the new volume be if the temperature is raised to 150°C?
Answer:
0.17166666666
Explanation:
Answer:
New volume V2 = 1.7625 L
Explanation:
Given:
Old temperature T1 = 27°C = 27 + 273 = 300 K
Old volume V1 = 1.25 L
New temperature T2 = 150°C = 150 + 273 = 423 K
Find:
New volume V2
Computation:
V1 / T1 = V2 / T2
1.25 / 300 = V2 / 423
New volume V2 = 1.7625 L
What are three facts about facilitated diffusion?
Answer:
you need my help come over
Explanation:
All generators need some source of energy to rotate the coil or magnets.
True or False
.energy mechanical needs it Answer:
Yes.
Explanation:
CO2
What is the type of bond
Carbon’s valence?Thanks for answer
Answer:
as in valence electrons? 5.
Answer:
Carbon has 4 Valence electrons
Which of the following DOES NOT belong to the group?
A.eyes
B.mouth
C.large intestine
D.stomach
Answer:
eyes
Explanation:
It is because the mouth, large intestine and stomach comes in the digestive system abd eyes doesn't.
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Until the 1500s, doctors thought
diseases were caused spontaneously. Scientists
began proposing that diseases were caused by
seed-like entities that could be passed among
people. After the invention of the microscope,
doctors came to know that many diseases were
actually caused by microscopic living organisms
like bacteria. What does this suggest about the
nature of scientific knowledge?-
Answer:
D
Explanation:
Select all the correct answers.
Why do the atoms in a piece of copper metal have no net charge?
1.The charges of the positive and negative copper ions cancel each other out.
2.The number of electrons surrounding each copper nucleus doesn’t change.
3.Copper atoms can’t lose electrons without a substance present to gain electrons.
4.When a copper atom loses electrons, it also loses a corresponding number of protons.
5.The copper atoms exchange neutrons instead of electrons.
Answer:
The correct answer is the charges of the positive and negative copper ions cancel each other out.
Explanation:
A copper metal having no net charge means that it is a neutral atom. A neutral atom means that total number of protons is equal to the total number of electrons.
When having an equal number of protons and electrons, what does that do to the overall charge of the element? Why do you think that?
basic forces.
Gravity is one of
Answer:
Fundamental force, also called fundamental interaction, in physics, any of the four basic forces—gravitational, electromagnetic, strong, and weak—that govern how objects or particles interact and how certain particles decay.
6. Which change to a population would cause
increased competition among
its members?
SC.7.L.17.3
ES
an increase in population size
B a decrease in population size
© an increase in predation on the
population
D an increase of disease in the population
Answer:
B
Explanation:
Because I said so
How do animal behaviors, such as hibernation or migration, enhance their survival?
Answer:
the reason a lot of animal ether hibernate is because they are escaping the cold or looking for food and the only reason we Humans don't hibernate is for two reasons. Firstly, our evolutionary ancestors were tropical animals with no history of hibernating: humans have only migrated into temperate and subarctic latitudes in the last hundred thousand years or so.
Explanation:
A molecule is
A a group of atoms bonded by ionic bonds.
B a group of atoms bonded by covalent bonds.
C a group of ions bonded by covalent bonds.
D a group of atoms bonded by metallic bonds.
Answer:
B.
Explanation:
Atoms make up molecules and ionic bonds cannot make up a molecule because they do not share electrons like in a covalent bond.
Calvin shines a thin beam of light onto a material, and the light refracts. Which diagram best shows what happens to the light?
og in
Answer:
In goes in fractures (looks like broken angle)
Explanation:
Answer:
Has a broken angle and there are three arrows
Explanation:
I GOT IT RIGHT
type the correct answer in each box balance the equation
Answer:
5SiO2 + 2CaC2 ➡ 5Si + 2CaO + 4CO2
Explanation:
This question involves balancing the above equation. An equation is said to be BALANCED when all the atoms of each element in the reactant side equates that in the product side.
According to this question, a chemical reaction is given as follows: SiO2 + CaC2 = Si + CaO + CO2. Based on observation, the atoms of elements are Silicon, oxygen, calcium and carbon are not the same on the reactants and products side. Based on this, the balanced equation is:
5SiO2 + 2CaC2 ➡ 5Si + 2CaO + 4CO2
Which of the following statements BEST describes a mixture?
А
Carbon dioxide is an example of a heterogeneous mixture.
B
A compound and a mixture are the same type of substance.
Two elements that are in the area but not chemically combined can be a mixture.
D
A mixture is unable to be separated because the molecules have been chemically combined.
Answer: C) Two elements that are in the area but not chemically combined can be a mixture
==============================================================
Explanation:
An example of a mixture would be salt and water. The salt particles dissolve into the water but no chemical change has happened. I mean that no new chemical compound is made and also heat/energy is not given off. Furthermore, we can separate the two items (for instance through evaporation) and those two items retain their original properties. This helps show that the salt and water particles don't form a bond and we can separate those particles apart so to speak.
Another example of a mixture is iron and plastic. We can pull out the iron through using a strong magnet. Whether or not the iron is with the plastic, the iron retains its properties. The same can be said of the plastic. The two materials just happen to occupy the same space or volume or area.
If you have two chemicals react in some way to form a new chemical, then this is not a mixture. For instance if we combine vinegar and baking soda, it produces carbon dioxide and water. There isn't a process to undo this to get the vinegar and baking soda back (like there was a process to get the iron separated).
A light-year is a way to measure ______ in space.
O time
Odistance
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Answer:
Distance
Explanation:
The light-year is a measure of distance, not time. It is the total distance that a beam of light, moving in a straight line, travels in one year.
Answer:
distance pooh <3
Explanation:
Which elements are;
a)solids,
b)liquids
c)gases
at 25°C
If an atom of Oxygen (8 protons, 8 neutrons, and 8 electrons) gains two electrons, what is the charge of the ion formed?
Answer:
It becomes negative
Explanation:
protons carry a positive charge
neutrons carry a neutral charge
electrons carry a negative charge
if we add 2 more electrons, the charge of the ion becomes negative
thank you.
the particle that move around the nucleus is are
Answer:
electrons
The nucleus contains two types of subatomic particles, protons and neutrons. The protons have a positive electrical charge and the neutrons have no electrical charge. A third type of subatomic particle, electrons, move around the nucleus. The electrons have a negative electrical charge
Explanation:
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Which of the following best describes the distribution of the world’s food supply? Select all that apply.
Still unevenly distributed leaving millions starving to death.
Quickly changing to be evenly distribute based on humanitarian efforts.
Slowly changing to be slightly more evenly distributed based on humanitarian efforts.
Evenly distributed throughout the population of the world now.
Answer:
Slowly changing to be slightly more evenly distributed based on humanitarian efforts. Still unevenly distributed leaving millions starving to death.
Explanation:
Which descriptions offer examples of Correction Services workers? Select all that apply.
Jadee guards a company’s office building to prevent crime.
Doug supervises Jailers and makes sure their work meets standards.
Cortez maintains order in courts of law.
Midori investigates crimes and arrests crime suspects.
Rudy monitors people who are on probation and parole.
Nancy guards inmates in a prison.
Answer:
its B, E, F
Explanation:
on edge 2021
Answer:
2. Doug supervises Jailers and makes sure their work meets standards.
5. Rudy monitors people who are on probation and parole.
6. Nancy guards inmates in a prison.