Answer:
c
Explanation:
When a radioactive atom emits an alpha particle, the mass number of the radioactive atom
A. Increases because the alpha particle contains 2 electrons
B. Decreases because the alpha particle contains 2 electrons
C. Increases because the alpha particle contains 2 protons
D. Decreases because the alpha particle contains 2 protons
Answer:
d or c
Explanation:
Answer:
c
Explanation:
did it
Will someone actually help me and not just something random
Answer:
D
Explanation:
What is the molariity of a 50.0 mL aqueous solution containing 10.0 grams of table salt, NaCl?
Answer:
3 mol/L
Explanation:
You should know or have the equation to solve for Molarity which is;
M = n/v (M: Molarity) (n: moles of solute) (v: Liters of solute)
You can start off differently but I would start by converting the mL to L. This is your "v" value.
50.0 mL/ 1000 mL = 0.05 L
Now, you have to convert grams to moles in order to solve for molarity (M).
1.) On the periodic table find the molecular weights of Na and Cl.
Na= 22.99 g/mol Cl= 35.45g/mol
2.) Add them together to have their combined molecular weights.
22.99 + 35.45= 58.44 g/mol
3.) Now, you're going to use the "picket fence method" or whichever your teacher taught you to convert from grams to moles. This will be your "n" value. (I cannot show it on here without it looking weird, so my sincere apologies.)
10.0 g/ 58.44 g = 0.17111 mol
4.)You are now going to plug in your answers into the equation for Molarity.
M= 0.17111 mol / 0.05 L = 3.4222
5.) I am sure your professor might be a stickler so for sig figs sake when you multiply or divide use the smallest amount of sig figs you see which is 1. Round 3.4222 to 3 mol/L
Sorry this explanation is long let me know if you need a better more written out sample.
What happens to Cr3+ ion when it
is converted to Cro42-
Its oxidation number decreases and undergoes reduction
When water changes into water vapor, this is called_______.
A) condensation
B) transpiration
C) precipitation
D) evaporation
Answer:
Evaporation
Explanation:
Evaporation turns liquid water into a gas called water vapor. If heat is taken away from water vapor, it condenses. Condensation turns water vapor into a liquid. If heat is taken away from liquid water, it freezes to become ice.
Answer:
D
Explanation:
List three methods that scientists can
use to develop organisms with desirable traits.
Answer:
Um I don't know if this is what you're looking for but selective breeding, genetic modification, The manipulation of plasmids ,- Grafting branches
Explanation:
Use the drop-down menus to identify each substance as an organic or inorganic compound
ozone (O3):
methane (CH4):
aluminum hydroxide (Al(OH)3):
butane (C4H10):
carbon monoxide (CO):
Answer:
ozone (O3): inorganic
methane (CH4): organic
aluminum hydroxide (Al(OH)3): inorganic
butane (C4H10): organic
carbon monoxide (CO): inorganic
Explanation:
An inorganic compound is typically a chemical compound that lacks carbon–hydrogen bonds, that is, a compound that is not an organic compound. Some simple compounds that contain carbon are often considered inorganic. Examples of inorganic compounds include carbon monoxide , carbon dioxide , carbonates, carbides , cyanides, cyanates, and thiocyanates. Most of these compounds are normal parts of mostly organic systems, including living organisms. When a chemical substance is classified as inorganic, it does not necessarily mean that it does not occur within
living things.
Organic compounds typically contain the carbon-hydrogen bonds. The carbon atoms often catenate and most organic substances occur in living systems and are products of biochemical reactions in living organisms. However, organic substances can also be synthetic and can be prepared in the laboratory.
Answer:
inorganic
organic
inorganic
organic
inorganic
Explanation: trust me
Fiona is examining a material. She notices that the material has a dull appearance and feels very brittle.
Fiona is most likely examining a _______
(I'll give brainliest)
"Typical nonmetals have a dull, coloured or colourless appearance; are brittle when solid; are poor conductors of heat and electricity; and have acidic oxides." - Wikipedia
Which equilibrium describes a reversible reaction a short time after starting the reaction with reactants only?
Answer:
Should be A
Explanation:
Name some uses of Chlorine and bromine compounds
Answer:
kii
Explanation:
How much would this compound weight
Answer:98g/mol
Explanation:
As the temperature of a fixed volume of a gas increases, the pressure will _____. A. vary inversely B. increase C. decrease D. not change
Answer:
increases
Explanation:
As the temperature of a fixed volume of a gas increases, the pressure will increase.
What is Gay Lussac's law?
According to this law at constant volume of gas, pressure is directly proportional to the temperature of the gas and it is represented as:
P ∝ T.
It means that if pressure increases then temperature is also increases or if pressure decreases then temperature will also decreases.
So, pressure of the gas increases.
To know more about Gay Lussac's law, visit the below link:
https://brainly.com/question/24002551
What happens when an object with elastic energy is released?
It uses kinetic energy to return to its original shape
It bounces like a ball
It uses potential energy to return to its original shape
It uses elastic energy to return to its original shape
Answer:
It uses kinetic energy to return to its original shape
what happens to the density of a box full of leaves if you crush up all the leaves and place them in another box
A the density increases
B the density stays the same
C the density decreases
D the density first decreases, then increases
Answer:
B the density stays the same
HELP WORTH 20 points if Awnser is correct
.3999 moles
The ideal gas law: PV = nRT
155 degrees Celsius = 428 Kelvins
n = PV/RT
n = 2.80 atm x 5.00 L/0.0821 (gas constant) x 428 K
= 0.398 moles
which of the following is the most accurate description of all known spaces
Answer:
where are the following??
like anything? any animal?
Explanation:
Answer:
vevaeeav
Explanation:cx fsbtenet
50 points guys please help me!!!!!!
Answer:
A. is internal balance
Explanation:
Answer:
A. is internal balance
Explanation:
The description is in the picture below:
An organelle found in plant cells,fungi and some protist, animal cells, and bacteria is the
Answer:
Vacuole
EXPLAINATION?:
A vacuole is a membrane-bound organelle which is present in all plant and fungal cells and some protist, animal and bacterial cells.
the same :/
Answer:
Vacuole
Explanation:
Is the relationship between volume and pressure direct or indirect? Explain your
answer
Answer:
Boyle's Law is a relationship between pressure and volume. In this relationship, pressure and volume have an inverse relationship when temperature is held constant. If there is a decrease in the volume there is less space for molecules to move and therefore they collide more often, increasing the pressure.
Explanation:
Please help me out! :))
Answer:
Pretty sure its B sorry if im wrong
Explanation:
How many joules are produced when 45 gram of copper is placed into water that releases them temperature from 12c to 71c (c)=0.75j/g*c
Answer:
Heat energy (Q) = 1.9925 KJ = 2 KJ (Approx)
Explanation:
Given:
Mass of copper (M) = 45 gram
Change in temperature (ΔT) = 71°C - 12°C = 59°C
Specific heat (c) =0.75 j /g*c
Find:
Heat energy (Q) = ?
Computation:
Heat energy (Q) = Mass(M) × Change in temperature (ΔT) × Specific heat (c)
Heat energy (Q) = 45 gram × 59°C × 0.75 j /g*c
Heat energy (Q) = 1991.25 J
Heat energy (Q) = 1.9925 KJ = 2 KJ (Approx)
_____________ is the energy stored because of its position or shape.
A. Potential energy
B. Kinetic energy
C. Thermal energy
D. Chemical energy
Answer:
Potential Energy is the energy stored because of its position or shape
Explanation:
A balloon filled with air has a volume of 6.50 L, a pressure of 0.900 atm, and a temperature of 25.0oC. If it is left out overnight, during which the temperature decreases to 15.0oC and the pressure rises to 1.15 atm, what will the volume of the balloon be?
Answer:
4.92 L
Explanation:
Rearrange ideal gas law and solve.
Change C to K.
- Hope that helps! Please let me know if you need further explanation.
NEED HELP ASAP!!!!!!!!!!!!!!!
Where will you encounter the least amount of life in the oceans?
abyssal plains (the ocean's bottom)
the beach
the top 200 meters of the ocean
inter tidal zone
Answer:
The abyssal plains
Explanation:
this is because it is so dark and devoid of resources that it is hard for most forms of life to survive
pls make me brainliest :) I'm trying to become an Ace
Answer:
abyssal
Explanation:
Why is soap mixed with water?
O A. The soap turns the water molecules into a nonpolar solvent.
B. It covalently bonds to the water so it can be washed away.
O C. Its polar end mixes with the water so it can be washed away.
D. The soap becomes chemically active when mixed with water.
Answer:
Explanation:
Soap breaks up the oil into smaller drops, which can mix with the water. It works because soap is made up of molecules with two very different ends. One end of soap molecules love water - they are hydrophilic. The other end of soap molecues hate water - they are hydrophobic.
Answer:
C. Its polar end mixes with the water so it can be washed away.
Explanation:
Just took test
The reaction for the combustion of methane is shown below. If 28.70g of methane
reacts with 51.40g of oxygen, how much water will be produced? Record your
answer with 2 decimal places.
CH
+
20,
oxygen
CO2
carbon dioxide
+ 2H,0
water
methane
Answer:
2.888mm needs for the reaction
If you decrease the amount of gas, what happens to the pressure? Explain WHY.
Answer:
Gas particles exert pressure by colliding with the walls of their container. If you reduce the volume, you are effectively increasing the density of the particles and they will collide with the walls more frequently, leading to an increase in pressure.
Explanation:
enjoy!
Multiply the following: (1.25 x 10^15) x (3.75 x 10^5).
Answer:
[tex]4.6875x10^20[/tex]
Explanation:
The new-moon phase occurs when the Moon is positioned between the Earth and the Sun. However, these positions do not always cause an eclipse of the Sun because the *
a. Moon's orbit is tilted relative to the Earth's orbit
b. New-moon phase is visible only at night
c. Night side of the Moon faces toward the Earth
d. Apparent diameter of the Moon is greatest during the new-moon phase
Answer:
D
Explanation:
The new-moon phase occurs when the Moon is positioned between the Earth and the Sun. However, these positions do not always cause an eclipse blocking of the Sun because the Moon's orbit is tilted relative to the Earth's orbit new-moon phase is visible only at night side of the Moon faces toward the Earth apparent
These positions do not always cause an eclipse of the Sun as:
d. Apparent diameter of the Moon is greatest during the new-moon phase
New-moon phase:At the new Moon phase, the Moon is so close to the Sun in the sky that none of the side facing Earth is illuminated. The new-moon phase occurs when the Moon is positioned between the Earth and the Sun. However, these positions do not always cause an eclipse blocking of the Sun because the Moon's orbit is tilted relative to the Earth's orbit. New-moon phase is visible only at night side of the Moon faces toward the Earth apparent.
Thus, correct option is d.
Find more information about New-moon phase here: https://brainly.com/question/12676209
(7.02 LC) Which statement about this reaction is correct?
Answer: The reaction of one mole of oxygen [tex](O_2)[/tex] releases 445 kJ of energy.
Explanation:
Exothermic reactions are defined as the reactions in which energy of the product is lesser than the energy of the reactants. The total energy is released in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be negative.
Endothermic reactions are defined as the reactions in which energy of the product is greater than the energy of the reactants. The total energy is absorbed in the form of heat and [tex]\Delta H[/tex] for the reaction comes out to be positive.
[tex]CH_4(g)+2O_2(g)\rightarrow CO_2(g)+2H_2O(l)[/tex] [tex]\Delta H=-890kJ[/tex]
on halving the reaction, enthalpy also becomes half
[tex]\frac{1}{2}CH_4(g)+O_2(g)\rightarrow \frac{1}{2}CO_2(g)+H_2O(l)[/tex] [tex]\Delta H=-445kJ[/tex]
Thus The reaction of one mole of oxygen [tex](O_2)[/tex] releases 445 kJ of energy.
