Answer:
European Union was on grand committee
Answer:
European Union
Explanation:
hehe
All waves on the electromagnetic spectrum travel...
A
at different speed depending on their energy
B
at the speed of light (3x108 m/s)
C at different speeds depending on their wavelength & frequency
at their own pace, because they can't be bothered
Answer:B
at the speed of light (3x108 m/s)
Explanation: because it use quizlet
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
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! ~
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
Mass = 25g, Volume = 5mL. What is the density? *
Answer:
5ml
Explanation:
m/v
25/5=5
means 25÷5=5
Which of the following is a form of mechanical energy?
Group of answer choices
Thermal energy
Kinetic energy
Chemical energy
Nuclear energy
Answer:
thermal energy
Explanation:
due to the heat
Answer:
Answer:kinetic energy
Explanation:
Mechanical energy can be either kinetic energy (energy of motion) or potential energy (stored energy of position).
A 5 kg ball is traveling at the same speed as a 10 kg ball. Compared to with 5 kg ball, the 10 kg ball has (2 points)
Answer: twice the momentum
Explanation:
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
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.
((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.
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.
10. Some animals only have cell.
Answer:
no animals have cells
Explanation:
cells are a theory made up by old scientists
Determine whether or not each combination of substances can be used to create a buffer. 0.1 M HCl, 0.1 M KCl Choose... 0.1 M HNO2, 0.05 M NaOH Choose... 0.05 M HNO2, 0.05 M NaNO2 Choose... 1 M Na2HPO4, 1 M NaH2PO4 Choose... 0.4 M KOH, 0.2 M NaOH Choose...
Answer:
Explanation:
A buffer solution is a mixture of two substances consisting of a weak acid and it's conjugate base. A buffer solution resists a change in pH.
From the description above, we can denote that a buffer must consist of a weak acid and it's conjugate base/salt.
The first option has a strong acid (HCl) and hence the solution cannot form a buffer.
The second option has a strong base (NaOH) which is not a conjugate base of HNO₂. Thus the solution cannot form a buffer.
The third option has HNO₂ which is a weak acid and NaNO₂ which is it's salt, hence it can form a buffer.
The fourth option has NaH₂PO₄ which will act as an acid while Na₂HPO₄ will act as it's salt to produce a phosphate buffer.
The fifth option has two strong bases hence cannot form a buffer
The combination which serves as a buffer solution is 0.05 M HNO2, 0.05 M NaNO2.
A buffer solution is a solution that is made up of a weak acid and its conjugate base. It is also a solution of a weak base and its conjugate acid. We need to look at the options listed and find out the option that is composed of a weak acid and its conjugate base or a weak base and its conjugate acid.
The combination which serves as a buffer solution is 0.05 M HNO2, 0.05 M NaNO2. HNO2 is a weak acid and NO2- is its conjugate base hence they compose a buffer solution.
Learn more: https://brainly.com/question/13439771
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:
This is how manganese appears in the periodic table.
What is the arrow is pointing to?
period symbol of manganese
isotope symbol of manganese
group symbol of manganese
atomic symbol of manganese
Answer: The atomic symbol of manganese or Aka D
Explanation: I did the test
Answer:
The atomic symbol of manganese or Aka D
Explanation:
Shelly wants to find the speed that her dog can run. What should Shelly do?
A. measure the distance the dog runs
B. measure the time the dog runs
C. measure the size of the dog and the distance it runs
D. measure the time it takes for the dog to run a certain distance
Answer:A
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.
Water brought to the surface from deeper water is warm and nutrient-poor. *
Answer:
You made a statement not a question
Explanation:
A. Calculations for the Determination of Ammonium Chloride The data from the data entry portion of the report has been copied into this section of the report for your convenience. Use the data to make the necessary calculations.
(1) Mass of evaporating dish on #1: 38.646
(2) Mass of evaporating dish and original sample (a): 39 591
(3) Mass of evaporating dish after subliming Nha (g) 39.4750
B. Calculations for the Determination of Sodium Chloride 14 Mass of evaporating dish #2: IS Mass of watch glass (a):
(1) Mass of evaporating dish #2 38700 g
(2) Mass of watch glass. 28 299 g
(3) Mass of evaporating dish #2, watch glass and NaCl(a): 67,355
C. Calculations for the Determination of Sand
Mass of evaporating dish #1: 38.645
Mass of evaporating dish and SiO2 (g) 39.405
D. Summary
Mass of original sample (0)
Experimental mass recovered (NH4Cl + NaCl + S107)
Differences in these weights (g) (use the absolute value of the difference)
recovery of matter
Select a reasonable explanation to account for the differences. There may be more than one possible reason that makes sense, just select one of them.
A. It is possible not all of the water was evaporated from the sand, causing the recovered mass to be higher.
B. It is possible not all of the water was evaporated from the sand, causing the recovered mass to be lower.
C. While drying the NaCl, the liquid bolled and some splattered out of the evaporating dish, causing the recovered mass to be lower.
D. While drying the Naci, the liquid boiled and some splattered out of the evaporating dish, causing the recovered mass to be higher.
E. There was no difference in recovered and original mass, so there is no difference to account for.
Answer:
A
Explanation:
Considering question A
Mass of original sample is [tex]m_o = 0.945 \ g [/tex]
Mass of NH4Cl is [tex]m_n = 0.116 \ g [/tex]
Percent of NH4Cl is [tex]k = 12.275 \% [/tex]
B
Mass of NaCl [tex]m_k = 0.359 \ g [/tex]
C
Mass of SiO2 [tex]m_e = 0.46[/tex]
D
Mass of original sample [tex]m_o = 0.945 \ g [/tex]
Differences in these weights (g) (use the absolute value of the difference)
recovery of matter [tex]G = 0.01 \ g [/tex]
The correct option is C
From the question we are told that
The mass of evaporating dish on #1 is [tex]m_1 = 38.646 \ g[/tex]
The mass of evaporating dish and original sample [tex]m_2 = 39 591 \ g[/tex]
The mass of evaporating dish after subliming [tex]NH_4Cl [/tex] is [tex]m_3 = 39.4750 \ g[/tex]
Generally the mass of the original sample is mathematically represented as
[tex]m_o = m_2 - m_1[/tex]
=> [tex]m_o = 39 591 - 38.646 [/tex]
=> [tex]m_o = 0.945 \ g [/tex]
Generally the mass of [tex]NH_4Cl[/tex] is mathematically represented as
[tex]m_n = m_2 - m_3[/tex]
=> [tex]m_n = 39 591 - 39.4750[/tex]
=> [tex]m_n = 0.116 \ g [/tex]
The Percent [tex]NaH_4 Cl (g)[/tex]
[tex]k = \frac{ m_n}{m_o} *100[/tex]
=> [tex]k = \frac{0.116 }{0.945} *100[/tex]
=> [tex]k = 12.275 \% [/tex]
Considering question B
The mass of evaporating dish #2 is [tex]m_g = 38700\ g[/tex]
The mass of watch glass is [tex]m_a = 28 299 \ g[/tex]
The mass of evaporating dish #2, watch glass and NaCl [tex]m_b = 67,355 \ g[/tex]
Generally the mass of NaCl is
[tex]m_k = m_b -[m_g + m_a][/tex]
=> [tex]m_k = 67,355 -[38700 + 28 299][/tex]
=> [tex]m_k = 0.359 \ g [/tex]
Considering question C
The mass of evaporating dish is [tex] m_p= 38.645[/tex]
The mass of evaporating dish and SiO2 [tex]m_s = 39.105 \ g[/tex]
Generally the mass of SiO2 is mathematically represented as
[tex]m_e = 39.105 - 38.645[/tex]
=> [tex]m_e = 0.46[/tex]
Considering D
The mass of the original sample is [tex]m_o = 0.945 \ g[/tex]
Generally the experimental mass recovered (NH_4Cl,NaCl, SiO2 ) is mathematically evaluated as
[tex]M =0.116 + 0.46 + 0.359[/tex]
[tex]M = 0.935 \ g [/tex]
Generally the differences in these weights (g) of recovery of matter is mathematically represented as.
[tex]G =0.945- 0.935 [/tex]
=> [tex]G = 0.01 \ g [/tex]
While drying the NaCl, the liquid boiled and some splattered out of the evaporating dish, causing the recovered mass to be lower.
WILL GIVE BRAINLYEST The following element has how many protons?
silicon
14
SI 28.086
Question 9 options:
14
56
7
28
Answer:
14.
Explanation:
Answer:
14 hope this helps
Explanation:
Atomic Mass-Atomic Number my guy
Question 2
1.5 moles of copper (Cu) consists of how many atoms of copper?
Which explains one reason evaporation can be used to separate a mixture? The desired component has a higher boiling point than the other components. The desired component has a different density from the other components. The mixture is a solution that contains a substance that will crystallize out. The desired component has the smallest particles in the mixture.
Answer: The component has a higher boiling point
Explanation:
Answer:
A. The desired component has a higher boiling point than the other components.
Explanation:
This is on the unit test
The length is 3 inches, the width It’s 4 inches, the height is 5 inches. What is the volume
Answer:
answer is 60 inches ^3.
multiply!
A mixture of 80.0 g of Cr2O3 and 8.00 g of C is used to produce elemental Cr by the reaction below:
Cr2O3 + 3 C ----> 2 Cr + 3 CO
a) What is the theoretical yield of Cr that can be obtained from the reaction mixture?
b) The actual yield is 21.7 g Cr. What is the percent yield for the reaction?
Answer:
A is 90g. B is 34.7g
Explanation:
Why can some atoms , such as helium , neon , and argon consist of a collection of individual atoms that move about independently of one another and all other atoms consists of two or more atoms joined by strong forces called chemical bonds ?
Answer:
Noble gases already have a completed Octet structure hence they are stable.
Explanation:
One basic reason for chemical reaction is that individual atoms seek to attain the stable Octet, that means, to have eight electrons on their outermost shell.
The noble gases are stable since they have already achieved this stable octet structure.
Having already filled electron shells, noble gases hardly participate in chemical bonding but often exist in the gas phase as isolated atoms.
The noble gases have been present as an individual atom due to the complete outer valence shell.
In an atom, the presence of valence electrons has been the representation of the reactivity of the atom.
The atoms tend to complete the outermost octet and become stable. In order to be stabilized, the elements form chemical bonds with the same element and have been present in the diatomic form.
However, with noble gases such as Neon, Helium the outer valence shell has been complete, they have been present as individual atoms with less reactivity.
For more information about the chemical bonds, refer to the link:
https://brainly.com/question/6071754
Give two examples in which the host is harmed.
Answer:
lice, mosquito
Explanation:
both are examples of parasitism
edit: wait nvm i thought this was bio
The following question was posed on an exam:
An unknown non-metal element (Q) forms two gaseous fluorides of unknown molecular formula. A 3.2g sample of Q reacts with fluorine to form 10.8 g of the unknown fluoride A. A 6.4 g sample of Q reacts with fluorine to form 29.2 g of unknown fluoride B. Using these data only, demonstrate by calculation and explanation that these unknown compounds obey the Low of Multiple Proportions.
A student responded with the following answer: The Law of Multiple Proportions states that when two elements form two or more compounds, the ratios of the masses of the elements between the two compounds are in o simple whole number ratio. So, looking of the data above, we see that the ratio of the moss of element Q in compound A to the mass of element Q in compound B is, which is a simple whole number ratio. This demonstrates that these compounds obey the low of Multiple Proportions. Assess the accuracy of the students answer. In your assessment, you must determine what information is correct or Incorrect, provide the correct information where needed, explain whether the reasoning is logical or not, and provide logical reasoning where needed.
Answer:
The answer given by the student is not totally correct.
Explanation:
Law of multiple proportions states that an element Q will react with different volume of Fluorine to produce two non-similar compounds. Hence, the ratio of the masses(Fluorine only) needs to be an absolute reduced value.
Given that:
3.2 g of a sample of Q reacts with Fluorine to form 10.8 g of the unknown fluoride A.
This means the mass of Fluorine present in the compound = 10.8 g - 3.2 g = 7.6 g
Thus, 3.2 g of a sample of Q reacts with 7.6 g of Fluorine.
Also, 6.4 g sample of Q reacts with Fluorine to form 29.2 g of unknown fluoride B.
If we divide the samples by (2), we have 3.2 g sample of Q reacting with Fluorine to form 14.6 g of unknown fluoride B.
This means the mass of Fluorine present in the compound = 14.6 g - 3.2 g = 11.4 g
Thus, 3.2 g Q reacted here with 11.4 g fluorine.
Hence, 11.4/7.6 = 1.5 = 3/2
This above therefore satisfies the law of multiple proportions.
This is not aligned with what the student did, what the student did was to relate the amount of Q used to make A and B. Suppose, we start with twice amount of Q, the ratio would have been smaller(i.e. the ratio of Q).
So, this doesn't relate to the law of multiple proportions.
The law of multiple proportions is specifically concerned with the mass of the element rather than Q that can react with Q. Therefore, there is more reason to relate the two samples of equal masses of Q that react with different masses of Fluorine. The ratios of Fluorine will then be small whole numbers.
You have 0.14 moles of sodium chloride (NaCl). How many grams do you have? ( 1 mole of NaCl = 58 grams NaCl) *
0.14 grams NaCl
3.2 grams NaCl
5.9 grams NaCl
8.12 grams NaCl
Answer:
Option D is correct = 8.12 grams of NaCl
Explanation:
Given data:
Moles of sodium chloride = 0.14 mol
Mass of sodium chloride = ?
Solution:
Formula:
Number of moles = mass of NaCl / Molar mass of NaCl
Molar mass of NaCl = 58 g/mol
Now we will put the values in formula.
0.14 mol = Mass of NaCl / 58 g/mol
Mass of NaCl = 0.14 mol × 58 g/mol
Mass of NaCl = 8.12 g of NaCl
Thus, 0.14 moles of NaCl contain 8.12 g of NaCl.
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
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.