Answer:
True
Explanation:
Given parameters:
Number of neutrons = 21
Mass number = 40
Unknown:
Number of electrons = 19
Number of neutrons = 21
Solution:
To find verify whether it is true or false, we must understand the relationship between the given species.
Protons are the positively charged particles
Neutrons do not carry any charge
electrons are the negatively charged particles
Mass number = number of protons + neutrons
Number of protons = 40 - 21 = 19
In an atom, the number of protons and electrons are the same for charge stability.
Number of electrons = 19
How many kilograms do you have with 100g of tortillas
answer:
1 kilogram!
explanation:
hope this helped <3 also if wouldn't mind could you pls give me brainliest? (im trying to level up) thanks! :)
What color would Sodium fluoride make in a flame test
SOMEONE ANSWER IN 2 MINS
Answer:
Sublimation
Condensation
Boiling, or vaporization
Which set of elements has similar bonding properties?
Answer:
The vertical side of the periodic table.
Explanation: They have the same number of valence electrons and chemical properties. (I'm not saying it's right just trying to help:) )
At standard pressure, the total amount of heat required to completely vaporize a 100. gram sample of water at its boiling point is
Answer:
The heat of vaporization relates the amount of heat required to transform a certain phase of a certain amount of substance from liquid to gas. The heat of vaporization of substances can be expressed in terms of joules per gram or joules per mole.
ExplanaDetermine the total amount of heat, q, that is required to evaporate the given amount of water at its boiling point. For this problem, we simply apply the equation,q
=
m
Δ
H
v
a
p
where m is the mass and
Δ
H
v
a
p
is the enthalpy of vaporization of water. We use the following values:
m
=
100
g
Δ
H
v
a
p
=
2.26
k
J
/
g
We proceed with the solution.
q
=
m
Δ
H
v
a
p
=
(
100
g
)
(
2.26
k
J
/
g
)
=
226 k
j tion:
Forces and Motion:Question 10
Which is the best statement about an object in motion?
Select one:
The object will eventually always stop.
0
The object will keep accelerating.
The object will remain in motion until it experiences an unbalanced force.
o
The object will always slow down
Answer: The object will remain in motion until it experiences an unbalanced force.
Explanation: If you know about Newton's law of physics or whatever it is called, you will find that and object will always keep moving, until it is stopped by an outside force.
What atoms are present in the water molecule?
Answer:
hydrogen and oxygen
Explanation:
h20=1hydroden 2 oxygen
Answer: To calculate the number of molecules and atoms in a water drop, you need to know the chemical formula of water. There are two atoms of hydrogen and one atom of oxygen in each water molecule, making the formula H 2 O. So, each molecule of water contains 3 atoms. Molar Mass of Water
Explanation:
PLEASEEE HELPPPP
Consider the equation:
4A1+302 - 2Al2O3
Is this equation balanced? Why or why not?
The chemical equation is balanced
Further explanationThe chemical equation is said to be balanced if the number of atoms in the reactants and the number of atoms in the product is the same.
Balancing the equation can be done by adjusting the reaction coefficients in the products and reactants and not changing the chemical formula
This method can be done by balancing each atom first by giving a coefficient of 1 on the most complex compound
Reaction
[tex]\tt 4Al+3O_2\Rightarrow 2Al_2O_3[/tex]
To check if this equation is balanced, take a look at the number of each of the atoms in the products and reactants
Al : left=4, right=4O : left=6, right=6Because the number of atoms is the same, it can be said that the chemical equation above is balanced
How many grams of boron are in 8.11 moles?
Answer:
87.67720999999963
Explanation:
Answer:
87.67720999999963
Explanation:
I have added 12.0 L of air.To a balloon at sea level(760 torr). If I take the ballon with me to Colorado, where the air pressure is 0.650 atm, what will the new volume of the balloon be?
Answer:
18.46 L
Explanation:
From the question given above, the following data were obtained:
Initial volume (V1) = 12.0 L
Initial pressure (P1) = 760 torr
Final pressure (P2) = 0.650 atm
Final volume (V2) =..?
Next, we shall express the pressure in the same unit of measurement.
Thus, 760 torr is equivalent to 1 atm.
Finally, we shall the new volume of the balloon as follow:
Initial volume (V1) = 12.0 L
Initial pressure (P1) = 1 atm
Final pressure (P2) = 0.650 atm
Final volume (V2) =..?
P1V1 = P2V2
1 × 12 = 0.650 × V2
12 = 0.650 × V2
Divide both side by 0.65
V2 = 12/0.65
V2 = 18.46 L
Therefore, the new volume of the balloon is 18.46 L.
Example of genetic biodiversity
Answer:
Different breeds of dogs.
Different varieties of rose flower.
Explanation:
A 10.0 g piece of hot metal at 300. °C was dropped into a 150.0 g sample of cooler room temperature water that was initially 25.0 °C. If 6.25 kJ of heat was transferred, what was the final temperature of the water?What was the specific heat of the metal?
Answer:
The final temperature of water is 34.92 ⁰C
The specific heat of the metal is 2357.78 J/kg⁰C
Explanation:
Given;
mass of the hot metal, m = 10.0 g = 0.01 kg
temperature of the hot metal, [tex]t_m[/tex] = 300 °C
mass of water, [tex]m_w[/tex] = 150 g = 0.15 kg
initial temperature of the water, [tex]t_w_i[/tex] = 25.0 °C
heat lost by the hot metal = heat gained by water
Q = 6.25 kJ = 6250 J
let the final temperature of water = T
[tex]Q = m_w C_p_w (T-t_w_i)\\\\T-t_w_i = \frac{Q}{m_wC_p_w}\\\\ T= \frac{Q}{m_wC_p_w} + t_w_i\\\\T = \frac{6250}{(0.15)(4200)} + 25\\\\T = 34.92 ^0 C[/tex]
The final temperature of water is also the equilibrium temperature.
The specific heat of the metal is given by
[tex]Q = mC_p_m (300 - T)\\\\C_p_m = \frac{Q}{m(300 - T)}\\\\ C_p_m = \frac{6250}{0.01(300 - 34.92)}\\\\ C_p_m = 2357.78 \ J/kg ^0C[/tex]
ice is melting at 0 degrees Celsius. Explain how the temperature of the melting ice stays the same while the thermal energy increases.
Because the heat applied to the ice is used to create the state transition rather than raising the temperature of the ice, the temperature stays constant while the ice is melting.
What is temperature ?The physical concept of temperature indicates in numerical form how hot or cold something is. A thermometer is used to determine temperature. Thermometers are calibrated using several temperature scales, which traditionally drew on different reference locations.
When ice melts, it absorbs the energy necessary to raise an equivalent mass of water by 80 degrees Celsius. As the material melts, the temperature stays steady at 0 C.
In contrast to water, which will not change phase at 0°C, ice will experience a phase transition at this temperature, requiring greater energy.
Thus, the temperature stays constant while the ice is melting.
To learn more about temperature, follow the link;
https://brainly.com/question/11464844
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How the kidneys filter wastes from the blood?
Each of your kidneys is made up of about a million filtering units called nephrons. Each nephron includes a filter, called the glomerulus, and a tubule. The nephrons work through a two-step process: the glomerulus filters your blood, and the tubule returns needed substances to your blood and removes wastes.
Each of your kidneys is made up of about a million filtering units called nephrons.
Each nephron includes a filter,
called the glomerulus, and a tubule. The nephrons work through a two-step process:
the glomerulus filters your blood,
and the tubule returns needed substances to your blood and removes wastes
help u can get brainliest if u answer :)
Answer:
I think its D unless i understand it wrong
In order to draw a Lewis structure, it is important to ______. *
a. determine the atomic number of each atom in the molecule
b. add unshared pairs of electrons only around nonmetal atoms
c. determine the total number of valence electrons in each atom
d. determine the electronegativity of each atom
Answer: C. Determine the total number of valence electrons in each atom
Explanation: That’s the main thing that a Lewis structure/ e-dot diagram shows!
Which answer choice describes the noble gases?
Answer:
have a full outer electron shell
Explanation:
Which of the below statements are true? A. There can be a change in heat (kJ) without the temperature changing by. Heat remains constant through a change of state c. Temperature changes through a change of state d. Heat and temperature are the same
Answer:
A. There can be a change in heat (kJ) without the temperature changing by.
Explanation:
A. There can be a change in heat (kJ) without the temperature changing by.
This is correct. It is what happens whenever there is a change in state.
B. Heat remains constant through a change of state
This is incorrect. During change of state like boiling, the amount of heat changes.
c. Temperature changes through a change of state
This is incorrect. During boiling, the temperature is fixed at 100 celcius
d. Heat and temperature are the same
This is incorrect. Heat refers to the total energy of the molecule. Temperature on the other hand is a measure of how hot or cold something is. Plus they have different units.
Protons and electrons are found in the nucleus of an atom.
True
False
Answer:
False ,
Explanation:
Protons are found in the nucleus , but electrons are found on the outside ( electron cloud )
What side of the equation are the products found?
(Balancing Chemical Equations Using Models Worksheet)
Answer:
The right
Explanation:
Cell has a cell membrane and mitochondria but no cell wall.
Animal cells have cell membranes and mitochondria, but only plant cells have cell walls.
You have journeyed to mars and have just encountered a Martian. You want to explain a s'more to the creature. You need to be able to describe a marshmallow. How will you describe it? (Use all your senses to start and then think of its physical properties!)
Answer: The marshmallow is a spongy sweet candy.
Explanation:
The following are the physical characteristics of marshmallow:
1. It is white, pink, or may be in any color.
2. It can be round, square, or rectangular in shape.
3. It can be spongy and elastic.
4. It is dusted with rice flour or sugar powder before it is packed in the packets.
5. It is gummy and takes time in chewing.
What is the frequency of a radar photon with energy 6.80 x 10^-25J? (h = 6.63 x 10^-34 J•s)
Answer:
E=hv where E=energy h=planks constant v=frequency
So, v=E/h
=6.8x10^-25/6.63x10^-34
=1025641026Hz
=1.03x10^9Hz
=1.03GHz
Explanation:
The frequency of radar photon is "1.03 GHz".
According to the question,
Energy,
E = [tex]6.80\times 10^{-25} \ J[/tex]Planks constant,
h = [tex]6.63\times 10^{-34} \ J.s[/tex]The frequency will be:
→ [tex]v = \frac{E}{h}[/tex]
[tex]= \frac{6.80\times 10^{-25} \ J}{6.63\times 10^{-34} \ J.s}[/tex]
[tex]= 1.03\times 10^{9\ Hz}[/tex]
[tex]= 1.03 \ GHz[/tex]
Thus the above response is right.
Learn more about Radar photon here:
https://brainly.com/question/8000078
draw the structure of a graphite
You mix 10g of sugar into 100ml of water and 5g of salt into the same volume. Which is more soluble? Would it matter what temperature it was? Use the words solute, and solvent in your answer.
Answer:
Answers are in the explanation.
Explanation:
A solution is the mixture of 2 or more substances in which the substance in less amount is the solute and the substance must abundant is the solvent.
The more soluble solute is the one that can be dissolved in the biggest amount. As there are dissolved 10g of sugar and 5g of salt, the more soluble is sugar
Normally, the solutes are more solubles when the temperature increases. If you can't dissolve a solute, you can try heat it and probably it would be dissolved.
Distinguish between abiotic and biotic factors. Give examples of each.
Answer:
abiotic factors are nonliving aspects of an environment, such as wind, water, and sunlight, while biotic factors are living things, such as animals and plants in the ecosystem.
Answer:
abiotic- nonliving objects
biotic- living objects
Explanation:
ex for abiotic- rocks, air, water, etc
ex for biotic- dogs, cats, fish, people, plants, etc
Which of the following is/are TRUE about heat transfer?
w. heat energy can never be transferred.
x. heat flows from cooler to hotter object.
y. heat travels from hotter to cooler object.
z. heat can transfer through convection, conduction, and radiation
Group of answer choices
x and y
y and z
w and z
w and x
What occurs when a sample of CO2(s) changes to CO2(g)?
Answer:
Sublimation.
Explanation:
Sublimation occurs when a solid changed directly to gas.
I hope this helps.
Sublimation occurs when a sample of CO₂(s) changes to CO₂(g).
What is sublimation?
When temperature is given to a state of matter it changes it's physical state. When temperature is given to solid state and it changes to gas, then it's called as Sublimation.
Examples of sublimation-
Solid carbon dioxide (dry ice) sublimes everywhere
Naphthalene sublimes easily
Solid iodine sublimes easily
Therefore, sublimation occurs when a sample of CO₂(s) changes to CO₂(g).
Learn more about sublimation, here:
https://brainly.com/question/29304516
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Obtaining energy from the breaking of chemical bonds in nutrients.
A. Molecule
B. Energy
C. Organism
D. Chemical reaction
E. Matter
F. Cellular respiration
Answer:
D. Chemical Reaction
Explanation:
Meaning: A process that involves rearrangement of the molecular or ionic structure of a substance, as opposed to a change in physical form or a reaction.
Every elements atoms are the same.
True
False
Answer:
Two atoms of the same chemical element are typically not identical. ... Two atoms of the same element can be different if their electrons are in different states. If one copper atom has an electron in an excited state and another copper atom has all of its electrons in the ground state, then the two atoms are different.
Explanation:
