I NEED HELP ASAPPP !!!!!!
Two amounts of the same element, no matter their mass, will have the same density.
True or false?
Answer:
True
Explanation:
If it is the same element no matter the volume the density will be the same. Since both are the same substance, as long as both were in the same temperature and phase their density will be identical.
A single atom of an element has 11 protons, 11 electrons, and 12 neutrons. Which element is it?
V
Na
Mg
Se
Answer:
Na is you answer! : ) - Good Day! ~
The negatively charged subatomic particles that are located in the electron cloud are called
(10 Points)
protons
electrons
neutrons
nucleus
The amount of matter in an object
A Mass
B weight
C non contact force
D friction
E net force
Answer:
A)Mass
Explanation:
Mass measure the amount of matter
burning yourself by touching boiling water conduction, convection, radiation
Answer:
Burning yourself by touching boiling water would be conduction.
Explanation:
Why? I believe it would be because conduction means "transfer of" and the water is boiling and if you touch it, it burns you because it transfered heat to your skin causing you to feel a burning sensation.
what element has 3 electron shells and 4 valence electrons
Answer:
I believe it is boron.
Explanation:
Clouds are formed by the which process Option A - Evaporation Option B - Condensation Option C - Transpiration
Answer:
B
Explanation:
why is bc i passesd thia in school so i think this is it
I will give Brainliest and 30 points to whoever answers first!
3,5, and 1 i think maybe i uhm yeah
((Reuploaded...again...)) Do all structural formulas for each amino acid have an amino group? Please use your own words and don't copy and paste your answer from the web.
0.90 g of hydrogen chloride (HCl) is dissolved in water to make 2.0 L of solution. What is the pH of the resulting hydrochloric acid solution
Answer:
The pH of the resulting hydrochloric acid solution is 1.896
Explanation:
pH, short for Hydrogen Potential, is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.
The pH scale goes from 0 to 14. Values less than 7 indicate the range of acidity and those greater than 7 indicate alkalinity or basicity. The value 7 is considered neutral.
pH is defined as the opposite of the base 10 logarithm or the negative logarithm of the activity of hydrogen ions or hydronium ions (H₃O)., whose equation is
pH = -log [H⁺] = -log[H₃O⁺]
Then you must know the concentration of [H⁺] or [H₃O⁺]
A strong acid is one that dissociates completely, therefore, a quantity of H + ions are transferred to the solution. Since HCl is a strong acid, then [HCl] = [H⁺]
Being molarity the number of moles of solute that are dissolved in a certain volume, it is defined as:
[tex]molarity=\frac{moles of solute}{volume}[/tex]
So you must know the number of moles of HCl. Being its molar mass equal to 36.45 [tex]\frac{g}{mole}[/tex], then the following rule of three can be applied: if there are 35.45 grams of HCl in 1 mole, 0.9 grams of HCl in how many moles will they be?
[tex]moles of HCl=\frac{0.9 grams*1 mole}{35.45 grams}[/tex]
moles of HCl= 0.0254
Then, being the number of moles of solute 0.0254 and the volume 2 L, the molarity is:
[tex]molarity=\frac{0.0254 moles}{2 L}[/tex]
[tex]molarity=0.0127\frac{moles}{L}[/tex]
Then, the concentration of [HCl] is 0.0127 [tex]\frac{moles}{L}[/tex]. So [HCl] = [H⁺] = 0.0127 [tex]\frac{moles}{L}[/tex].
So the pH is calculated as:
pH = -log [H⁺]= -log 0.0127
pH= 1.896
The pH of the resulting hydrochloric acid solution is 1.896
Copper has a density of 8,96 g/cm2 The amount of 75,0 g of copper is added to 0,0500 litres of water in a graduated cylinder. The volume reading to which the water level in 118
cylinder will rise in mililitres is (a).
Answer:
Volume reading rise to 58.37 mL
Explanation:
Given data:
Density of copper = 8.96 g/cm³
Amount of copper = 75.0 g
Volume of water in cylinder = 0.0500 L
Volume rise = ?
Solution:
First of all we will calculate the volume of copper. The volume rise up is equal to the volume of copper.
Formula:
d = m/v
8.96 g/cm³ = 75.0 g/ v
v = 75.0 g / 8.96 g/cm³
v = 8.37 cm³
cm³ = mL
Volume of water = 0.0500 L × 1000 mL / 1L
Volume of water = 50 mL
Volume reading rise to = 50 mL + 8.37 mL
Volume reading rise to 58.37 mL.
If 1.48 g of Cl2 reacts with excess P, what is the total change in enthalpy in kilojoules? 2P+5Cl2⟶2PCl5ΔH=−886kJ
Answer:
-3.72 (or -3.70 depending on what values you used)
Explanation:
First, use the molar mass of Cl2 convert the mass of Cl2 to moles.
1.48 g Cl2(1 mol70.906 g)=0.02087 mol Cl2
Note that we are given ΔH=−886kJ. This refers to the enthalpy change associated with the reaction of 5mol of Cl2 by the balanced equation shown below.
2P+5Cl2⟶2PCl5ΔH=−886kJ
Therefore, to determine the enthalpy change associated with the reaction of 1.48gCl2, divide ΔH by 5molCl2 to determine the enthalpy change per mole of Cl2, then multiply by 0.02087 mol Cl2. (note: if you round up here to .021 mol of Cl2 you will get the final answer of -3.72 later)
0.02087 mol Cl2(−886 kJ5 mol Cl2)=−3.698 kJ
Rounding the answer should to three significant figures, we find that the enthalpy change associated with the reaction of 1.48gCl2 is −3.70 kJ.
Notice that coefficients in stoichiometric equations (indicating numbers of moles) are exact, so they do not constrain the number of significant figures.
The enthalpy change for the reaction when 1.48 g of Cl₂ reacts with excess P is –3.69 KJ.
We'll begin by calculating the number of mole of in 1.48 g of Cl₂. This can be obtained as follow:
Molar mass of Cl₂ = 2 × 35.5 = 71 g/mol
Mass of Cl₂ = 1.48 g
Mole of Cl₂ =?Mole = mass / molar mass
Mole of Cl₂ = 1.48 / 71
Mole of Cl₂ = 0.0208 moleFinally, we shall determine the enthalpy change for the reaction. This can be obtained as follow:
2P + 5Cl₂ —> 2PCl₂ ΔH = −886 KJ
From the balanced equation above,
5 moles of Cl₂ reacted to produce an enthalpy change of −886 KJ.
Therefore,
0.0208 mole of Cl₂ will react to produce an enthalpy change of = [tex]\frac{0.0208 * - 886}{5}\\\\[/tex] = –3.69 KJ.
Thus, the enthalpy change for the reaction when 1.48 g of Cl₂ reacts with excess P is –3.69 KJ.
Learn more: https://brainly.com/question/11945461
Can someone help me pls
Answer:
50 years
12.5 g
2.5 g
Explanation:
The half-life is the time it takes for the sample to become half of the original. At 0 years, none of the sample has decayed. At 50 years, half of the sample has decayed. This means that the half-life is 50 years.
If you look at the diagram, at 150 years, you will have 1/8 of the original amount. If you start with 100 g, you will have 12.5 g after 150 years.
100/8 = 12.5
Looking at the diagram, you can see that at 100 years, you will have 1/4 of the original amount. If you start with 10 g, you will have 2.5 g after 100 years.
10/4 = 2.5
If 850. mL of linseed oil has a mass of 620. g, calculate the density of linseed oil.
Density =
g/ml
Answer:
The answer is 0.73 g/mLExplanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass = 620 g
volume = 850 mL
We have
[tex]density = \frac{620}{850} \\ = 0.7294117647...[/tex]
We have the final answer as
0.73 g/mLHope this helps you
Rank these elements in order from lowest to highest ionization energies: Cr, K, Ba, F
Answer: F, K, Ba, Cr
What is different about beaker 4 compared to beaker 1
Answer:
Graduated cylinder vs Beaker
Both graduated cylinders and beakers are pieces of laboratory glassware that have a specific function. Graduated cylinders typically are more accurate at reading the volumes of the liquid inside. Beakers are better for stirring and mixing liquids
Explanation:
the gravitational energy of a golf ball at differnt heights is shown in the table below which graph best represent the relationship between the ball's gravitational energy and its height above the ground. I need helplease
Answer:
A because it's uniform
Answer:
a
Explanation:
Which choice best describes the movement of air at Earth's surface during a high-pressure system?
A convergence, sinking air
B divergence, sinking air
C divergence, rising air
D convergence, rising air
The answer your looking for is most certainly B cause as a result Divergence sinking air high pressure and mixed with sinking air it produces high pressure for example when hot and cold air mix it makes a Tornado so B is your most selected option! UwU lol
The choice that best describes the movement of air at Earth's surface during a high-pressure system is divergence, sinking air. The correct option is B.
What is divergence and sinking air?Divergence is one of the processes of movements of plates of the earth. There are three processes by which the plates move. Divergence is the one where the two plates move toward each other.
Sinking air increase the pressure at the surface. They create high-pressure belts in the latitudes. When the air moves away from the poles, the pressure starts to decrease.
So, the remaining are convergence and rising air, they both create low-pressure belts. As we move upwards, the pressure decrease due to gravitational force.
Thus, the correct option is B. divergence, sinking air.
To learn more about divergence and sinking air, refer to the link:
https://brainly.com/question/2935804
#SPJ6
10. Some animals only have cell.
Answer:
no animals have cells
Explanation:
cells are a theory made up by old scientists
please help me need help.
Why are electrons able to move around the atom but protons are not?
Electrons are able to "move" around the atom in set energy states in different orbitals, because the electrons "move" so fast around the nucleus where they are is just represented with an area of probability since their location and velocity cannot be measured with certainty. Protons and Neutrons are packed tightly in the nucleus held together by the strong nuclear force so they are not able to freely move.
Is wind non-living? And the reason why if it's living or non-living?
Answer:
yes wind is nonliving because it has no form of life to it
URGENT i need this fast
Which statement about the electron-cloud model is true?
O It is the currently accepted atomic model.
It can easily be replaced by existing models.
O It specifies the location and momentum of an electron.
O It does not explain the formation of emission lines.
Answer:
The answer you are looking for would be A
Explanation:
I took the test
Answer:
A.) It is the currently accepted atomic model.
Explanation:
edge 2021
what is the volume in milliliter (mL) of 250 cm3 beaker
Answer:
250mL
Explanation:
Select the true statements about protein secondary structure.
A. In an α‑helix, the side chains are located on the outside of the helix.
B. The secondary level of protein structure refers to the spatial arrangement of short segments of the protein.
C. In a β‑pleated sheet, the side chains are located between adjacent segments.
D. Disulfide bonds stabilize secondary structure.
E. The α‑helix is held together by hydrogen bonds between the amide N−H and C=O groups.
Answer:
The α‑helix is held together by hydrogen bonds between the amide N−H and C=O groups.
Disulfide bonds stabilize secondary structure.
Explanation:
Proteins have primary, secondary, tertiary and quartinary structures.
The secondary structure of a protein is the regular, recurring sequence of amino acid in a polypeptide chain. Secondary structure of proteins give rise to the folding observed in the structure of a protein.
The major secondary structures of a protein are α-helices and β-structures.
What are the missing
coefficients?
_Fe + _Cl2 → _FeCl3
Which phase has the greatest structure
Which statement accurately describes the habitabillity of the planets?
Answer:
Are there suppose to be answer choices?
Explanation:
Why doesn't the outer electron on the potassium atom experience the full charge of the protons in the nucleus (+19)?
Answer:
There are 18 electrons shielding it from the nucleus
Explanation:
The shielding effect is the reduction in the effective nuclear charge on an electron, due to repulsion by the inner electrons in the atom.
Potassium has 19 electrons, 18 of which are in the inner shells of the atom. These 18 electrons "shield" the outermost electron from feeling the effect of the nuclear charge. The magnitude of effective nuclear charge felt by an electron as a result of screening by other inner electrons is given by Slater's rules.
Which of the following is true about the third shell?
It has 3 orbitals.
It has 3 subshells.
It has 9 subshells.
It has 9 orbitals.
It has the capacity for 9 electrons.
It has the capacity for 18 electrons.
Answer:
It has 3 subshells, it has 9 orbitals, and it has the capacity for 18 electrons
Explanation: