Answer:
D
C
Explanation:
2. Which of the following element has no neutron partied particle?
A. Hydrogen B. Helium
C. Lithium
D Sodium
Answer:
A.hydrogen
Explanation:
A normal hydrogen (H) atom does not have any neutrons in its tiny nucleus
1. Lithium, water, edible salt, chalk, Carbon, Lime, Nitrogen, Potassium, Oxygen,
Iodides, Iron, Chlorine, etc are some matters.
(a) Expressing the matters of the stem by symbol and formula separate the elements
and compounds. ---3 marks
Answer:
Explanation:
An atom is the smallest unit of an element that can take part in a chemical reaction. Atoms (and there corresponding symbols) mentioned in the question are
Lithium ⇒ Li
Carbon ⇒ C
Nitrogen ⇒ N
Potassium ⇒ K
Oxygen ⇒ O
Iron ⇒ Fe
Chlorine ⇒ Cl
A compound is substance that contains two or more atoms that are chemically combined and can be represented with a chemical formula. The compounds (and there corresponding formula) mentioned in the question are
Water ⇒ H₂O
Edible salt (sodium chloride) ⇒ NaCl
Chalk (calcium carbonate) ⇒ CaCO₃
Lime (calcium oxide) ⇒ CaO
Iodides (such as sodium iodide and potassium iodide) ⇒ NaI and KI respectively
Describe the movement of the asthenosphere
I am giving 62 points to first person to answer
Answer:
Explanation:
Convection currents generated within the asthenosphere push magma upward through volcanic vents and spreading centres to create new crust.
URGENT!
A series of experiments are conducted with five different cups, each filled with the same amount of water. One cup is kept at room temperature (25 °C), while the other four cups are heated to four different temperatures. Sugar is added to each cup until no more will dissolve. The amount of sugar added to each cup is recorded. Which answer correctly identifies the control group, independent variable, dependent variable, and controlled variable in the experiment?
Control Group: temperature of the water Independent Variable: cup of water at room temperature Dependent Variable: amount of sugar dissolved Controlled Variable: amount of water in each cup
Control Group: temperature of the water Independent Variable: cup of water at room temperature Dependent Variable: amount of water in each cup Controlled Variable: amount of sugar dissolved
Control Group: cup of water at room temperature Independent Variable: temperature of the water Dependent Variable: amount of sugar dissolved Controlled Variable: amount of water in each cup
Control Group: temperature of the water Independent Variable: amount of sugar dissolved Dependent Variable: amount of water in each cup Controlled Variable: cup of water at room temperature
Answer:
Either the first one or the third one.
Explanation:
Using process of elimination: knowing that the controlled variable is something the conductor is able to control and stays the same throughout; the amount of water is the same, but it also states that temperature is not the same throughout. This cancels out B because the amount of sugar dissolved varies and doesn’t stay the same. D fits the same criteria as well.
so now we are left with A and C.
An independent variable is something that can be by itself and doesn’t depend on anything else. Sugar is NOT independent, as it dissolves DEPENDING on the amount of liquid. So we can already rule out that sugar is a dependent variable. Both A and C have those choices though, so now we are with the control group and the independent variable.
Think about it, which is the independent variable? Water amount doesn’t depend on anything, while the temperature depends on the room. So the answer is most likely A.
Hope this helps, don’t stress about homework. Happy Holidays!
what phase change requires a substance to absorb energy?
What is the approximate temperature of 1.4 moles of a gas with a pressure of 3.25 atmospheres in a 4.738-liter container
Answer:
134K
Explanation:
Using the ideal gas law equation;
PV = nRT
Where;
P = pressure (atm)
V = volume (Litres)
n = number of moles (mol)
R = gas constant (0.0821 Latm/Kmol)
T = temperature (K)
Based on the information provided, n = 1.4moles, P = 3.25atm, V = 4.738L, T = ?
3.25 × 4.738 = 1.4 × 0.0821 × T
15.3985 = 0.11494T
T = 15.3985/0.11494
T = 133.969
Approximately;
T = 134K
The net force on a car accelerating
at a rate of 2.5 m/s2 is 2,000
newtons. Calculate the mass of the
car.
Answer:
800 kgExplanation:
The mass of the car can be found by using the formula
[tex]m = \frac{f}{a} \\ [/tex]
f is the force
a is the acceleration
From the question we have
[tex]m = \frac{2000}{2.5} \\ [/tex]
We have the final answer as
800 kgHope this helps you
HELP ME AGAIN FOR BRAINLIEST
Answer:
1: C
2: a
3: B
4: D
hope this helps
Element ______ has 2 valence electrons and is in period 4.
Answer:
Calcium
2.8.8.2
last energy she'll got 2 electrons
as 2 valency
How do intermolecular forces of methane and water explain the different boiling points of the two substances?
Explanation:
In methane the intermolecular forces are the weak London dispersion forces. Water molecules are held together by hydrogen bonding.
London dispersion forces are weak forces of attraction between molecules. It is a predominant in compounds that have very weak polarity.Hydrogen bonding is the electrostatic attraction between the hydrogen of one molecule and the electronegative atom(O or N or F) of a neighboring molecule.Hydrogen bonds holds water molecules together. Since it is a stronger bond, it confers a higher boiling point
Why is a reaction between Sodium and Potassium impossible?
Answer:
it is because a number of factors, including sample surface cleanliness and temperature, can prevent chunks of alkali metals from exploding on contact with water. The team eliminated those variables and others by using a sodium-potassium alloy that remains liquid at room temperature and a droplet delivery system featuring a calibrated syringe.
Answer: Potassium has a chloride mixture which makes it so sodium interacts easily with it to form the bond
Why do you think the size of a white dwarf affects its visual luminosity?
Reward
_________
Brainliest
Thanks
Points
_________
Thank you so much!
Answer:
the bigger the size the more easier to see from a distance and the smaller the harder to see.
Explanation:
Elerium would have 25 protons, 30 neutrons and 24 electrons. What would its mass number be?
Answer:
55
Explanation:
mass number=protons+neutrons
=25+30
=55
What is the variable for the equilibrium constant?
Answer:
The constant can be calculated using the ratio of products to reactants when the equation has reached equilibrium. The equilibrium constant is often represented by the variable Keq, which is defined by the equilibrium constant expression
If 0.213 moles of argon occupies a volume of 652 mL at a particular temp and pressure, what volume would it occupy if 0.162 moles of argon were added at the same conditions?
Answer:
V₂ = 495.89 mL
Explanation:
Given data:
Initial number of moles = 0.213 mol
Initial volume = 652 mL
Final number of moles = 0.162 mol
Final volume = ?
Solution:
V₁/n₁ = V₂/n₂
By putting values,
652 mL/0.213 mol = V₂ /0.162 mol
V₂ = 652 mL 0.162 mol /0.213 mol
V₂ = 105.62 mL.mol /0.213 mol
V₂ = 495.89 mL
Which sentence would be inappropriate in an informational piece of writing with a formal tone?
A: People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play.
B: Thirty-nine plays, a combination of comedies, histories, and tragedies, are attributed to William Shakespeare.
C: William Shakespeare, a poet, and playwright have generally deemed the greatest writer in the history of the English language.
D: Scholars speculate that Hamlet may have been informed by the relationship between Shakespeare and his son Hamnet, who died at eleven years of age.
Answer:
Its a
Explanation:
i took the quiz
The sentence that is inappropriate in an informational piece of writing with a formal tone is "People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play." The correct option is A.
What is a formal tone?In academic or professional settings, a formal writing tone is common. This tone emphasizes thoroughness and directness while remaining respectful.
It emphasizes facts and grammatical correctness and uses full words rather than contractions.
The use of standard English, more complex sentence structures, the infrequent use of personal pronouns, and the absence of colloquial or slang terms characterize formal language.
In informal language, nonstandard English forms, colloquial vocabulary, and typically shorter sentence structures are permitted.
"People find Shakespeare's Pericles, Prince of Tyre boring and annoying because it's possible that he didn't even write the entire play," is an inappropriate sentence in a formal informational piece of writing.
Thus, the correct option is A.
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What would happen to the air pressure on Earth's surface if the density of Earth's atmosphere were to suddenly double?A. The air pressure would decrease by half. B. The air pressure would increase 2X. C. The air pressure would stay the same. D. The air pressure would increase 4X.
Answer:
B. The air pressure would increase 2X
Explanation:
Pressure = density × acceleration due to gravity × height
p = ρ × g × h
Pressure is force per unit area
p = F/a
Density is mass per unit volume
Pressure is directly proportional to density hence, any change in the density of a body directly affects the change in pressure of the body and vice versa.
Old photographic flashbulbs burn magnesium metal in a reaction that causes a flash of brilliant white light. A photographer would need to take care not to suffer burned fingers when trying to replace the hot bulb. What best identifies the energy transformation that occurs in the flashbulb? chemical energy to electromagnetic energy and thermal energy electromagnetic energy to chemical energy and thermal energy chemical energy to electromagnetic energy thermal energy to chemical energy
Answer:
A
Explanation:
Answer:
A
Explanation:
Not D or B
Which answer best describes what is happening in the following reaction?
2C8H18 + 25O2 Right arrow. 16CO2 + 18H2O
This is not a redox reaction. It is an example of combustion.
This is a redox reaction in which octane (C8H18) is oxidized.
This is a redox reaction in which carbon dioxide (CO2) burns due to ignition.
This is not a redox reaction, because a solution of carbon dioxide and water results.
Answer:
b. This is a redox reaction in which octane (C8H18) is the reducing agent.
Explanation:
edge 2021 i just did it
The statement which best describes the reaction is:
This is not a redox reaction. It is an example of combustion.
What is redox reaction?This is a reaction which is accompanied by a change in the oxidation number of the reacting elements
What is combustion reaction?This is a reaction in which a substance burns in air (oxygen) to produce carbon dioxide, CO₂ and water, H₂O
Considering the equation given
2C₈H₁₈ + 25O₂ —> 16CO₂ +18H₂O
we can see that C₈H₁₈ burns in air (oxygen) to produce carbon dioxide, CO₂ and water, H₂O
Thus, we can conclude that the reaction is not redox but an example of combustion reaction
Learn more about combustion reaction:
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What is the volume of a gas balloon filled with 4.0 moles of tha gas, when the barometer reads pressure of 780 Torr and temperature is 30°C.
Answer:
V = 96.61 L
Explanation:
Given data:
Number of moles = 4.0 mol
Pressure = 780 torr (780/760 = 1.03 atm)
Temperature = 30°C
Volume of gas = ?
Solution:
The given problem will be solve by using general gas equation,
PV = nRT
P= Pressure
V = volume
n = number of moles
R = general gas constant = 0.0821 atm.L/ mol.K
T = temperature in kelvin
Now we will convert the temperature.
30+273 = 303 K
1.03 atm × V = 4.0 mol × 0.0821 atm.L/ mol.K × 303 K
V = 99.505 atm.L / 1.03 atm
V = 96.61 L
Which of the following represents a molecule
A Ca
B Co
C CO
D Cu
Answer:
C. CO
Explanation:
A molecule is a substance that is a combination of two or more atoms through a chemical bond while an element is a substance containing only one type of atom. However, some elements are also considered molecules because of having diatoms such as: Hydrogen, Oxygen, Chlorine, Bromine, Fluorine, Nitrogen and Iodine.
Among the choices above, it is only choice C (Carbon monoxide) that is a molecule. All the other options (Calcium, Cobalt and Copper) are elements. Carbon monoxide is a combination of one atom of carbon and another atom of oxygen.
The option that represents a molecule would be CO. That is option C.
What is a molecule?A molecule is defined as the substance that is made up of two or more elements that are chemically combined together.
From the options give above, CO which is carbon monoxide is diatomic. This shows that it contains two elements making it a molecule.
Learn more about molecules here;
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Which of the following of elements would have all four valence electrons
B, Si, As, Te
C, Si, Ge,Sn
O, S, Se, Te
Ga, Ge, As, Se
Answer:
D
they are used for manufacturing Of diodes
Answer:
is the answer D
Explanation:
hsjskajdidbxksbsvzjwvshhz7duw
A student measures the sides of a piece of paper to determine the area of the paper. His measurements are: 5.70 cm length and 10.22 cm width. What is the area of the paper (recorded to the correct number of significant figures)?
Answer:
58.3 cm
Explanation:
took the quiz.
Which symbol represents a salt?
O CaCl2
O C6H12O6
O C2H2
O 02
A) CaCl2
Calcium chloride is an inorganic compound, a salt with the chemical formula CaCl2. It is a colorless crystalline solid at room temperature, highly soluble in water.
relative atomic mass of sulphuric acid
A folded rock formation with the label A at the top of one of the folds. A geologist sees this folded rock when studying in the field. He is drawn to the sample that is labeled A. He determines this formation was caused by compression. What type of landform did he find at label A? anticline syncline plateau fault-block mountain
Answer:
Anticline
Other than that Just A C:
Explanation:
Answer:
A
Explanation:
how many kilograms are in 125 pounds
Answer:
125 pounds = 56.6990463 kilograms
Explanation:
Which of the following situation Is the best example of long-term movement? A- Take a quick trip to the store B- Go to school each day C- Move to a new state D- Visit the library after school?
Answer:
The Answer Is C
what is the number of sigma and pi bond in butanol?
Answer:
Sigma Bonds = 14
Pi bonds = 0
Explanation:
Butanol:
[tex]\sf CH_{3} -CH_{2}-CH_{2}-CH_{2}-OH[/tex]
There is no pi bond in this compound (since there is no double or triply bond)
So,
Pi bond = 0
Now, Coming towards sigma bonds
Sigma bonds = 3 (First carbon with hydrogen) + 2 (Second C with H) + 2 (Third C with H) + 2 (Fourth C with H) + 1 (Bond of O and H) + 4 (Bonds between C and C and C and O)
Sigma Bonds = 14
[tex]\rule[225]{225}{2}[/tex]
Hope this helped!
~AnonymousHelper1807Supongo que quiere preparar una solución al 10% de sulfato de magnesio en peso. El frasco del producto químico que se tiene indica que el sulfato de magnesio heptahidratado Cuántos gramos de hidratado serán necesarios para preparar 120 gramos de esta solución .Cuántos gramos de agua?
Answer:
Se requerirán 14.57 gramos de MgSO₄·7H₂O, que se disolverían en 105.43 gramos de agua.
Explanation:
Si tenemos 120 gramos de una solución al 10% de sulfato de magnesio en peso, habrán en la solución (120*10/100) 12 gramos de sulfato de magnesio (MgSO₄).
Sin embargo, el reactivo que está disponible es heptahidratado (MgSO₄·7H₂O), por lo que hay que calcular cuántos gramos de sulfato de magnesio heptahidratado contendrán 12 gramos de MgSO₄.
Calculamos las moles de 12 gramos de MgSO₄, usando su masa molecular:
12 g MgSO₄ ÷ 120.305 g/mol = 0.0997 mol MgSO₄.Después calculamos la masa de MgSO₄·7H₂O que contendrá 0.0997 mol MgSO₄, usando la masa molecular de MgSO₄·7H₂O:
0.0997 mol * 246.305 g/mol = 14.57 g MgSO₄·7H₂OPara saber la cantidad de agua en la que se disolverá el reactivo, restamos la masa de soluto de la masa total de la solución:
120 g - 14.57 g = 105.43 g