Answer:
Elements with short half lives exist because each element has stable isotopes, and the decay os isotopes create more isotopes as well.
If an atom the atomic number 10 and the mass number 12, how many VALENCE electrons does it have?
Below are is a before and after particle diagram that shows the process of
condensation. Choose the statement below that best describes how the
particles changed in their arrangement during this process.
Attempt d
2 Minute
Before: Gas 100 C
After: Liquid 30 C
Answer:
It must first melt to become a liquid and then evaporate to become a gas
Explanation:
What do all living organisms in an area make up?
To make 4.25 L of 3.0 M NaOH solution how much of a 9.0 M NaOH solution would be needed?
Answer:
1.41 L
Explanation:
Initially the concentration of NaOH was 9.0M (say M1) finally the concentration becomes 3.0M (say M2)
intial volume (say V1) is to be calculated when the final volume (say V2) is 4.25L
we have,
M1V1=M2V2
or V1=(M2V2)/M1= 3.0×4.25/9.0= 1.41L
Hence 1.41 L of 9.0M solution is required to prepare 4.25L of 3.0M NaOH solution
Gasoline contains chemical potential energy. When you place gasoline in a car, you use up the gasoline and have to refill your gas
tank. How can a teacher state that energy can neither be created nor destroyed in light of this observation?
A)
The teacher is only talking about chemical reactions.
B)
The teacher is stating a theory and not an actual law.
0)
This is an exception to the law of conservation of energy.
D
The energy must be converted into different forms like motion and heat
Ammonia (NH3) is widely used as a fertilizer and in many household cleaners. How much ammonia is produced when 5.81 mol of hydrogen gas react with an excess of nitrogen gas?
Answer:
65.841 g
Explanation:
The balanced equation for this reaction is;
N2 + 3H2 → 2NH3
From the question, we are interested in ammonia and the hydrogen gas.
From the equation
3 mol of H2 produces 2 mol of NH3
5.81 mol would produce x
Solving of x;
x = 5.81 * 2 / 3
x = 3.873 mol
Converting to mass;
Mass = Number of moles * molar mass
Mass = 3.873 * 17 = 65.841 g
whether carboxylic acids are electrolytes
Answer:
??
Explanation:
HElPpp AsAPp I’ll mark you as brainlister!!
The large number before a molecule in a chemical formula is called a _______________.
O subscript
O coefficient
O equation
Answer:
Subscript
Explanation:
The little number you see to the right of the symbol for an element is called a subscript. That number indicates the number of atoms of that element present in the compound. When balancing an equation, you can change the coefficients but not the subscripts.
hope this helps! if not, it's got to be coefficient or equation
When liquid H2O is chemically separated in a scientific investigation it forms H2 gas and O2 gas. If the number of hydrogen and oxygen molecules does not change through the equation, then the mass will
Select one:
decrease from reactants to products.
stay the same from reactants to products.
increase from products to reactants.
increase from reactants to products.
You need 65.0 g of aluminum for an experiment. How many atoms of aluminum is that?
Answer:
Explanation:
To convert the mass of Aluminum to atoms, we must first convert to moles by using the formula;
mole = mass/molar mass
Answer:N
=
9.69×1022 Al atoms
Explanation:
Just took quiz! xx
how are heat, temperature, and thermal energy related?
Answer:
Heat, temperature, and thermal energy are related because they all work with each other.
Explanation:
First of all, everything start's off with temperature. It starts off low. But when heat is added to it, it rises and the temperature goes up. This causes thermal energy to the objects touching it. The hotter it is the faster the particles move and the more kinetic energy they have.
100 cm3 of the copper sulfate solution contains 1.8 g of copper sulfate.
Calculate the mass of copper sulfate in 25 cm of this copper sulfate solution.
Answer:
The mass of copper sulfate in 25 cm³ of the copper sulfate solution is 0.45 g
Explanation:
The given parameters are;
The volume of the copper sulfate solution = 100 cm³
The mass of the copper sulfate in the solution = 1.8 g
Therefore, the mass of copper sulfate in 25 cm³ of the solution is given as follows;
The mass of copper sulfate in 100 cm³ of the solution = 1.8 g
The mass of copper sulfate in 1 cm³ of the solution = 1.8 g/100 = 0.018 g
Therefore;
The mass of copper sulfate in 25 × 1 = 25 cm³ of the solution, m = 25×0.018 g = 0.45 g
∴ The mass of copper sulfate in 25 cm³ of the solution, m = 0.45 g
2 points
There is a connection between photosynthesis and cellular respiration.
The products from one provide the raw materials for the other. This image
shows the relationship between the two processes. What products of
photosynthesis are starting material for cellular respiration? *
Answer:
glucose and oxygen
Explanation:
Glucose and oxygen are needed for cellular respiration to occur:)
help please
........
I am pretty sure it is Vitamin A... but I could be wrong. Sorry if it is wrong.
You start with a container that is 8L big and the temperature in the room is 326K.
If the you take the container out in the heat at 352K, how big will it get?
Answer:
The new volume is 8.64 L.
Explanation:
Charles's Law consists of the relationship that exists between the volume and the temperature of a certain quantity of ideal gas, which is maintained at a constant pressure. For a given sum of gas at constant pressure, as the temperature increases, the volume of the gas increases and as the temperature decreases, the volume of the gas decreases.
In summary, Charles's law is a law that says that when the amount of gas and pressure are kept constant, the quotient that exists between the volume and the temperature will always have the same value:
[tex]\frac{V}{T} =k[/tex]
Being an initial state 1 that modifies its conditions until a final state 2, it is fulfilled:
[tex]\frac{V1}{T1} =\frac{V2}{T2}[/tex]
In this case:
V1= 8 LT1= 326 KV2= ?T2= 352 KReplacing:
[tex]\frac{8L}{326 K} =\frac{V2}{352 K}[/tex]
Solving:
[tex]V2=352 K*\frac{8L}{326 K}[/tex]
V2= 8.64 L
The new volume is 8.64 L.
what happens to the electrons in an ionic bond and a covalent bond?
Answer:
In ionic bonding, atoms transfer electrons to each other. Ionic bonds require at least one electron donor and one electron acceptor. In contrast, atoms with the same electronegativity share electrons in covalent bonds, because neither atom preferentially attracts or repels the shared electrons.
Answer:
In ionic bonding,
atoms transfer
electrons to each
other. Ionic bonds
require at least one electron
donor and one electron
acceptor. In contrast, atoms
with the same electronegativity
share electrons in covalent
bonds, because neither atom
preferentially attracts or repels
the shared electrons.
21. What is an electron energy level?
can someone list these in correct order? from least brigehst to brightest?
Why aren’t dominant genes ALWAYS more common?
Answer:
selective breeding
Explanation:
Example: pretend that rabbits can only be brown or black and black is dominant. If only the brown rabbits reproduce it will eventually be more common Hope this helps
How many CARBON atoms are present in 2C3H8O3 ?
Answer:
b
Explanation:
Which led to the formation of oceans after water on Earth’s surface evaporated?
Answer:
Explanation:
En tiempos de la formación de la Tierra, el planeta se encontraba a una elevada temperatura, por lo que no le resultaba posible retener ningún tipo de atmósfera. La ausencia de nubes de vapor de agua y océanos en la tierra primigenia era causa directa de su temperatura, ya que el agua se encontraba combinada con los materiales rocosos.
Need help asap
Please help
Answer:
do u see my pfp its pico from newgrounds.com
Explanation:
The question and options are below {the attachment}
I don't have much time, so please help me!
TIME REMAINING
36:00
Answer:
i think its B
Explanation:
which of the following statements is true?
A. Displacement and distance traveled are always the same
B. Displacement and distance traveled are never the same.
C. Distance traveled is the direction of the displacement vector.
D. Displacement and distance traveled are the same if the direction does not change.
Answer:
D. Displacement and distance traveled are the same if the direction does not change.
Answer:
D
Explanation:
if a person in a single direction, then that person may travel certain distance and if the direction is not changed then its displecemengt remains same sa that person travelled distance.
Earths seasons in Northern Hemisphere: Choose ALL that apply.
Question 4 options:
More concentrated sunlight makes for cooler temperatures
The summer solstice occurs when the earth is in a position so that the North Pole is tilted most directly toward the sun.
The atmosphere absorbs some of the sun's rays
The tilt and revolution of the earth as it moves around the sun cause the different seasons of the year.
The summer solstice occurs when the earth is in a position so that the North Pole is tilted most directly toward the sun.
What is the summer solstice?The summer solstice happens when a pole on either the northern hemisphere or southern hemisphere, is found most inclined toward the sun.
The summer solstice then represents two different moments during the year according to the hemisphere. The summer solstice happens on June 21, and this period represents the longest day of the year.In conclusion, the summer solstice occurs when the earth is in a position so that the North Pole is tilted most directly toward the sun.
Learn more in:
https://brainly.com/question/4172420
Answer: B and D also hi
Explanation:
A gas has a volume of 900.0 mL at 35.0°C and 400.0 atm. What would the volume of the gas be at 258 °C and 700.0 atm of pressure?
Answer:
887 ML
Explanation:
yup
A homogenerous mixture is a mixture where you can see the different parts.
True
or
False
Answer:
the nwser is false
Explanation:
Its false becuase Homomogeneous means "One" and if you can see different parts of it then its not homogeneous. hope this helps!
What is the correct formula for Diphosphorus Hexoxide?
Answer:
Hey mate......
Explanation:
This is ur answer....
P₄O₁₀Hope it helps!
mark me brainliest pls.......
Follow me! :)
How do neutral metal atoms form ions?
Answer:
Neutral atoms can be turned into positively charged ions by removing one or more electrons. ... Atoms that gain extra electrons become negatively charged. A neutral chlorine atom, for example, contains 17 protons and 17 electrons. By adding one more electron we get a negatively charged Cl- ion with a net charge of -1.