Answer:
672kP
Explanation:
Equate the initial pressure with respect the first temperature. The unknown pressure to the second temperature and you cross multiply
Answer: 142kPa.
Explanation:got it right on edge 2020
A bird has flown 300 metres for 6 hours. What is the bird's speed? Formula for speed = d/t * 2 points
40 m/hr
50 m/s
50 m/h
50 m/min
Answer:
C
Explanation:
d=300
t=6hr
speed=?
speed=300/6
speed=50m/hr the important thing in this question is to get the right units
why doesn't calcium react with water in your body
explain pls
Answer:
Bones aren't made of calcium metal. Bones are a collegun structure filled in with mostly calcium carbonate and some calcium phosphate
Answer:
Bones aren't made of calcium metal. Bones are a collegun structure filled in with mostly calcium carbonate and some calcium phosphate
Explanation:
I hope this helps
Alpha particles cannot penetrate the skin. In which of the following circumstances could they still threaten human health?
A. If they travel into the human eye.
B. If they are inhaled or swallowed.
C. If they enter into the human ear.
D. If they are touched.
Answer:
B. If they are inhaled or swallowed.
Which compound is a hydrocarbon?
C 2 H 6
H 2 O
CO 2
C 6 H 12 O 6
Answer:
C2H6 OR C6H12O6 THE ANSWER
Explanation:
C2H6
!!!!!!!!!!
because it has both hydrogen and carbon as given in the word "Hydro-carbon"
Why is sodium an active metal
Answer:
Sodium is very reactive in nature. When exposed in air, it automatically forms Na2O. When it is put in water it reacts vigorously and starts burning on water. Due to the above reasons Sodium is called an active metal
Explanation: hope this helps pls mark as brainliest ty
Which is a property of all acids?
A. They increase the OH^- concentration in solution.
B. They contain OH^- ions.
C. They contain H3O^+ ions.
D. They increase the H^+ concentration in solution.
Acids increase the [tex]H^+[/tex] concentration in solution. Therefore, the correct option is D.
One of their essential characteristics is the ability of all acids to increase the concentration of H+ ions (protons) in a solution. Acids are chemicals that when dissolved in water add protons to the solution. As a result of this proton donation, the amount of [tex]H^+[/tex]ions in the solution increases, thereby lowering the pH. It is important to remember that not all acids contain[tex]H_3O^+[/tex] ions directly; Instead, [tex]H^+[/tex] ions can react with water molecules to generate [tex]H_3O^+[/tex] ions (hydronium ions).
Therefore, the correct option is D.
Learn more about Acids, here:
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state and explain the trends in the atomic radius and ionization energy for elements Li to Cs.
Explanation:
ionisation energy decrease down the group as the atomic radius increases. Nuclear charge increases. Number of shell increases so the electron will experience more shielding so it would be easier for the atom to loss electron.
how much energy (in joules) is needed to change 45.0 grams of ice at -25.0 C to water at 49 C?
Explanation:
The heat required to convert 25 grams of -10 °C steam is 78360 J or 78.36 kJ.
can someone pls tell me if this is correct? and also if possible, pls explain the difference between fractional and simple distillation, thank you sm <3
Explanation:
everything can be found in the picture
The below table compares the number of electrons in two neutral atoms.
atom:
Ne 10
Na 11
Compare the electron configuration and atomic radius of these two atoms and use that to explain the difference in their reactivity.
Please select the word from the list that best fits the definition
Occurs when an axon releases chemicals that allow a signal to jump across synapses between neurons
Answer:
When a nerve impulse reaches the end of an axon, the axon releases chemicals called neurotransmitters. Neurotransmitters travel across the synapse between the axon and the dendrite of the next neuron. Neurotransmitters bind to the membrane of the dendrite.Explanation:
I hope it's helpful for you ☺️One mole of Beryllium weighs 9.0122 grams. How many atoms of Beryllium are
there?
4
9.0122
6.022 x 10^23
18
Answer:
4
Explanation:
cause 1 mole of beryllium weighs 4gram
when water is added pH of the acidic solution
1 remain same
2 increases
3 decrease s
4 become zero
Answer:
the solution becomes less concentrated... meaning there is a decrease in acidity ...hence the pH slightly increases as lesser ph
means more acidity
The values used in the scale of pH and pOH are derived from a system designed by ______.
Curie
Gordonsen
Dalton
Sorenson
Which of the following acids has a basicity of 2?
1 point
ethanoic acid
hydrochloric acid
nitric acid
sulphuric acid
Answer:
its answer is nitric acid...
this may help you...Obtener la fórmula empírica de un compuesto cuya composición centesimal reporta: Cr: 26,53 % , S: 24,52 % y O: 48,96%. Dato: m.A. [Cr= 52 , S= 32]
Respuesta:
Cr₂S₃O₁₂
Explicación:
Primer paso: Dividir el porcentaje en masa de cada elemento por su masa atómica
Cr: 26,53/52 = 0,510
S: 24,52/32 = 0,766
O: 48,96/16 = 3,06
Segundo paso: Dividir todos los números por el más pequeño (0,510)
Cr: 0,510/0,510 = 1
S: 0,766/0,510 = 1,5
O: 3,06/0,510 = 6
Tercer paso: Multiplicar todos los números por algún número que haga que todos sean enteros (2)
Cr: 1 × 2 = 2
S: 1,5 × 2 = 3
O: 6 × 2 = 12
La fórmula empírica es Cr₂S₃O₁₂.
Answer: The empirical formula of the compound becomes [tex]Cr_2S_3O_{12}[/tex]
Explanation:
The empirical formula is the chemical formula of the simplest ratio of the number of atoms of each element present in a compound.
Let the mass of the compound be 100 g
Given values:
% of Cr = 26.53%
% of S = 24.52%
% of O = 48.96%
Mass of Cr = 26.53 g
Mass of S = 24.52 g
Mass of O = 48.96 g
The number of moles is defined as the ratio of the mass of a substance to its molar mass. The equation used is:
[tex]\text{Number of moles}=\frac{\text{Given mass}}{\text{Molar mass}}[/tex] ......(1)
To formulate the empirical formula, we need to follow some steps:
Step 1: Converting the given masses into moles.Molar mass of Cr = 52 g/mol
Molar mass of S = 32 g/mol
Molar mass of O = 16 g/mol
Putting values in equation 1, we get:
[tex]\text{Moles of Cr}=\frac{26.53g}{52g/mol}=0.510 mol[/tex]
[tex]\text{Moles of S}=\frac{24.52g}{32g/mol}=0.766 mol[/tex]
[tex]\text{Moles of O}=\frac{48.96g}{16g/mol}=3.06 mol[/tex]
Step 2: Calculating the mole ratio of the given elements.Calculating the mole fraction of each element by dividing the calculated moles by the least calculated number of moles that is 0.510 moles
[tex]\text{Mole fraction of Cr}=\frac{0.510}{0.510}=1[/tex]
[tex]\text{Mole fraction of S}=\frac{0.766}{0.510}=1.5[/tex]
[tex]\text{Mole fraction of O}=\frac{3.06}{0.510}=6[/tex]
Multiplying the mole fraction of all the elements by 2, in order to make it as a whole number
[tex]\text{Mole fraction of Cr}=(2\times 1)=2[/tex]
[tex]\text{Mole fraction of S}=(2\times 1.5)=3[/tex]
[tex]\text{Mole fraction of O}=(2\times 6)=12[/tex]
Step 3: Taking the mole ratio as their subscripts.The ratio of Cr : S : O = 2 : 3 : 12
Hence, the empirical formula of the compound becomes [tex]Cr_2S_3O_{12}[/tex]
The nth shell holds a minimum number of 2n2 electrons
True
False
Other:
Answer: The statement the [tex]n^{th}[/tex] shell holds a minimum number of [tex]2n^{2}[/tex] electrons is true.
Explanation:
The alphabet 'n' denotes the principal quantum number whose value can be equal to 1, 2, 3, and so on but can never be zero.
Basically, 'n' is the number of shell of an atom and total number of orbitals present in a shell is [tex]n^{2}[/tex].
Each orbital can hold up to a maximum of wo electrons. Hence, the [tex]n^{th}[/tex] shell can hold a minimum number of [tex]2n^{2}[/tex] electrons.
Thus, we ca conclude that the statement the [tex]n^{th}[/tex] shell holds a minimum number of [tex]2n^{2}[/tex] electrons is true.
please answer this as quickly as possible
Explanation:
I. Because an explosion is a very fast exothermic reaction
ll. it depends on the it's particle size
what is the purpose of environmental regulations on chemicals
Answer: EPA regulates the production and distribution of commercial and industrial chemicals, in order to ensure that chemicals for sale and use in the United States do not harm human health or the environment.
Explanation:
a sample of gas measures 5 liters at 1 atm. to change the volume to a 3.5 liters at constant temperature what pressure must be applied
Answer:
0.7atm
Explanation:
3.5/5 because constant temperature
If 3.02 g of CuNO3 is dissolved in water to make a 0.560 M solution, what is the volume of the solution in milliliters?
Answer: The volume of the solution is 28.75 mL
Explanation:
Molarity is defined as the amount of solute expressed in the number of moles present per liter of solution. The units of molarity are mol/L. The formula used to calculate molarity:
[tex]\text{Molarity of solution}=\frac{\text{Given mass of solute}\times 1000}{\text{Molar mass of solute}\times \text{Volume of solution (mL)}}[/tex] .....(1)
Given values:
Molarity of copper nitrate = 0.560 M
Given mass of copper nitrate = 3.02 g
Molar mass of copper nitrate = 187.56 g/mol
Putting values in equation 1, we get:
[tex]0.560=\frac{3.02\times 1000}{187.56\times \text{Volume of solution}}\\\\\text{Volume of solution}=\frac{3.02\times 1000}{187.56\times 0.560}=28.75mL[/tex]
Hence, the volume of the solution is 28.75 mL
please show step by step and I will mark you as brainliest answer ❤️
Answer: The pH of the solution is 13.
Explanation:
pOH is defined as the negative logarithm of hydroxide ion concentration present in the solution.
[tex]pOH=-\log [OH^-][/tex]
We are given:
Concentration of [tex]Ca(OH)_2=0.05mol/dm^3=0.5mol/L[/tex] (Conversion factor: [tex]1L = 1dm^3[/tex] )
1 mole of calcium hydroxide produces 1 mole of calcium ions and 2 moles of hydroxide ions
Concentration of [tex]OH^-=(2\times 0.05)=0.1mol/L[/tex]
Putting values in above equation, we get:
[tex]pOH=-\log (0.1)\\\\pOH=1[/tex]
We know:
[tex]pH+pOH=14\\\\pH=14-1\\\\pH=13[/tex]
Hence, the pH of the solution is 13.
The absorption spectrum of sodium has a line at 589 nm. What is the energy of this line? (The speed of light in a vacuum is 3.00 x 10^8 m/s, and Planck's constant is 6.626 x 10^-34 Jos.)
A. 8.89 x 10^26 J
B. 5.09 x 10^14 J
C. 3.37 x 10^-19 J
D. 2.96 x 10^18 J
Answer:
C. 3.37 x 10^-19 J
Explanation:
1234567890123345678901234567890
Answer:
1234567890123345678901234567890
Explanation:
trick question....
The most outer solid portion of
the planet Earth
Answer:
The lithosphere is the most outer solid portion of
he most outer solid portion ofthe planet Earth.
crust is the outermost layer of earth.
Nitrogen in plants and soil is changed into nitrogen compounds by _____ ?
Nitrogen Fixation because It's the process by which atmospheric nitrogen is converted either by a natural or an industrial means to form of nitrogen such as ammonia.
PLEASE HELP THIS IS AN EMERGENCY!!!!
A template of a Venn diagram representing common and differentiating characteristics of covalent and ionic bonds is shown.
Which of the following characteristics can be written only in space A? (5 points)
A.)Formed between atoms of similar electronegativities
B.)Formed between two metal atoms mostly found on the left of the periodic table
C.)Formed between two non-metal atoms mostly found on the right of the periodic table
D.)Formed between an atom that tends to lose electrons and an atom that tends to gain electrons
Answer:
D
Explanation:
Ionic bonds form when a metal and a nonmetal exchange electrons.
A) atoms with relatively similar electronegativities share electrons between them and form covalent bonds
B) the force that holds atoms together in a metallic substance is known as a metallic bond. such a solid consists of closely packed atoms....in short, the valence electrons in metals, unlike those of covalent bonds, are nonlocalized and capable of wandering relatively freely throughout the entire molecule
C) bonds formed between two nonmetals are mainly covalent bonds
.The characteristic that can be written in A only is that ionic bonds are "formed between an atom that tends to lose electrons and an atom that tends to gain electrons" option D.
Ionic bondIonic or electrovalent bonds are bonds formed between oppositely charged ions which are formed by a gain or loss of electrons and these ions are held together by strong electrostatic forces of attraction.
Properties of Ionic bondsThey are formed between oppositely charged ions ionsThey occur as a result of electrostatic forces of attraction between oppositely charged ions They are formed between an atom that tends to lose electrons {usually metals} and an atom that tends to gain electrons {usually non-metals}.Therefore, characteristic that can be written in A only is that ionic bonds are "formed between an atom that tends to lose electrons and an atom that tends to gain electrons" option D.
Learn more about ionic bonds at: https://brainly.com/question/13526463
The process of changing a gas to a liquid is known as _____.
sublimation
precipitation
evaporation
condensation
Answer:
Condensation is the process.
Which reaction will most likely take place based on the activity series? Li > K Ba CaNa > Mn > Zn > Cr> Fe> Cd Ni > H > Sb > Cu > Ag > Pd > Hg > Pt a. Ag+FeCl 3 b, Zn + CaO C. Ba+Na 2 CO 3 d . Cr+KNO3
Answer:
Among the given reactions,
a. Ag+FeCl 3
b, Zn + CaO
C. Ba+Na 2 CO 3
d . Cr+KNO3
which reaction is likely to take place based on the reactivity series?
Explanation:
The metal reactivity series is:
Li > K> Ba >Ca>Na > Mn > Zn > Cr> Fe> Cd Ni > H > Sb > Cu > Ag > Pd > Hg > Pt
The highly reactive metal will displace the less reactive metal from its compound during a displacement reaction.
a. Ag+FeCl 3
Ag is less reactive than Fe, so Ag cannot displace Fe from its compound.
This reaction also does not occur.
b, Zn + CaO
Zn is less reactive than Ca, so it cannot displace Ca from its compound.
This reaction does not occur.
C. Ba+Na 2 CO 3
Ba is more reactive than Na, so Ba displaces Na from its compound.
This reaction is possible.
d . Cr+KNO3
Cr is less reactive than K, so it cannot displace K from its compound.
Hence, This reaction is not possible.
Answer:
option c) Ba+Na 2 CO 3 -> BaCO3 +2Na
Answer:
C. Ba+Na 2 CO 3 -> BaCO3 +2NaWhy phenol is more acidic than alcohol?
Answer:
Phenol is more acidic than cyclohexanol and acyclic alcohols because the phenoxide ion is more stable than the alkoxide ion. ... But in a phenoxide ion, the negative charge is delocalized over the benzene ring. Phenoxide ion is therefore resonance stabilized.
Answer:
Phenol is more acidic than cyclohexanol and acyclic alcohols because the phenoxide ion is more stable than the alkoxide ion. ... But in a phenoxide ion, the negative charge is delocalized over the benzene ring. Phenoxide ion is therefore resonance stabilized.
Explanation:
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