Answers
Answer:
3
Explanation:
3 ampers (it says in the problem)
Related Questions
Which changes involve forming or breaking chemical bonds?
A.burning and digesting
B.boiling and melting
C.burning and melting
D.rusting and cutting
Answers
Answer:
d
Explanation:
i took the test
please anyone help me with this
Answers
Answer:
matter is anything that takes up space while elements are subtanxes that can be broken down
The unknown element (Johnsonium, Jo) contains three naturally occurring isotopes. The relative abundances and atomic mass are:
Moorium-36: abundance = 1.32%, mass = 35.978amu
Moorium-38: abundance = 3.25%, mass = 37.963amu
Moorium-40: abundance = 95.43%, mass = 39.962amu
What is the average atomic mass of "Moorium?"
Answers
Answer:
Average atomic mass of moorium is 39.844 amu.
Explanation:
Given data:
Atomic mass of moorium-36 = 35.978 amu
Relative abundance of moorium-36 = 1.32%
Atomic mass of moorium-38 = 37.963 amu
Relative abundance of moorium-38 = 3.25%
Atomic mass of moorium-40 = 39.962 amu
Relative abundance of moorium-38 = 95.43%
Solution:
Average atomic mass moorium = (abundance of 1st isotope × its atomic mass) +(abundance of 2nd isotope × its atomic mass)+ (abundance of 3rd isotope × its atomic mass) / 100
Average atomic mass of moorium = (1.32×35.978)+(3.25×37.963)+(95.43×39.962) /100
Average atomic mass of moorium = 47.491 + 123.380 +3813.574 / 100
Average atomic mass of moorium = 3984.445 / 100
Average atomic mass of moorium = 39.844 amu
Which option is an element?
a. oxygen
b. sodium chloride
c. air
d. water
Answers
Answer:
Explanation:
water
Answer:
oxygen
Explanation:
Which energy transformations occur when a candle burns?
Thermal energy transforms into mechanical energy and radiant energy.
Chemical energy transforms into thermal energy and electrical energy.
Thermal energy transforms into radiant energy and chemical energy
Chemical energy transforms into thermal energy and radiant energy.
Answers
Answer:
D - Chemical energy transforms into thermal energy and radiant energy
Explanation:
Correct on edge 2020
Answer:
(D)
Explanation:
Chemical energy transforms into thermal energy and radiant energy.
what's the difference between series and parallel circuit in table form?
Answers
In a parallel circuit, a different amount of current flows through each parallel branch of the circuit.
In the series circuit, different voltage exists across each component in the circuit.
Whereas in the parallel circuit, the same voltage exists across the multiple components in the circuit.
Hope this helps :)
Which contribution is a modification to Thomson's plum pudding model?
Atoms are indivisible.
Electrons are scattered in an atom.
A positively charged nucleus sits at the center of an atom.
Atoms of the same element have the same properties.
Answers
Answer:
Option C: A positively charged nucleus sits at the center of an atom.
Explanation:
Thompson’s plum pudding model was a model proposed by Thompson to show that an atom consisted of more than one fundamental unit.
In Thompson's model, he suggested that the atom consisted of a cloud of positive charges which were surrounded by electrons which are negative charges distributed throughout.
Now, Thompson's experiment was later rejected by Ernest Rutherford when he carried out the gold foil experiment and came to the conclusion where he proposed a model that the atom consisted of mainly empty space and that all its positive charge are concentrated at its center and further surrounded by a cloud of electrons.
From the given options, the correct one is Option C.
Answer: Option C: A positively charged nucleus sits at the center of an atom.
Explanation:
If an unknown sample contains 39.04% sulfuric acid by mass, then a 0.9368 g of that sample would require _____ mL of 0.2389 M NaOH for neutralization.
A) 31.22
B) 39.98
C) 7.80
D) 79.96
E) 15.61
Please give an answer and an explanation, thanks!
Answers
Answer:
A) 31.22
Explanation:
The reaction of sulfuric acid with NaOH is:
H₂SO₄ + 2 NaOH → Na₂SO₄ + 2H₂O
To solve this problem we need to determine the moles of acid that will react, and, using the chemical equation we can determine the moles of NaOH and the volume that a 0.2389M NaOH solution would require to neutralize it.
Moles H₂SO₄ (Molar mass: 98.08g/mol):
0.9368g * 39.04% = 0.3657g H₂SO₄ * (1mol / 98.08g) =
3.7289x10⁻³moles H₂SO₄
And moles of NaOH that you require to neutralize the acid are:
3.7289x10⁻³moles H₂SO₄ * (2 moles NaOH / 1 mole H₂SO₄) =
7.4578x10⁻³ moles NaOH
Using a 0.2389M NaOH solution:
7.4578x10⁻³ moles NaOH * (1L / 0.2389mol) = 0.03122L = 31.22mL
Right answer is:
A) 31.22The relative formula mass (M) of a Group 2 metal carbonate is 197
Relative atomic masses (Ar): C = 12
O = 16
Calculate the relative atomic mass (Ar) of the Group 2 metal in the metal carbonate
Name the Group 2 metal.
Answers
The relative atomic mass (Ar) : 137 and the element : Ba
Further explanationThe naming of chemical compounds is giving a special name to a compound that aims to facilitate the classification of compounds and facilitate the identification of a compound. The rules for naming chemical compounds have been determined by the IUPAC (International Union of Pure and Applied Chemistry)
This nomenclature includes the naming of ion compounds, covalent compounds, and polyatomic
The molar mass of a compound is given by the sum of the relative atomic mass of Ar
M AxBy = (x.Ar A + y. Ar B)
Group 2 metals have a +2 charge : M²⁺
So the compound of metal carbonate : MCO₃
Ar C = 12, O = 16
M MCO₃ = (1.Ar M + 1. Ar C+ 3. Ar O)
[tex]\tt 197=1. Ar~M+1.12+3.16\\\\197=Ar~M+12+48\\\\Ar~M=137[/tex]
The element with relative atomic masses 137 is Ba
So the compound : BaCO₃
5. What is a hypothesis and how is it used?
Answers
Answer: a supposition or proposed explanation made on the basis of limited evidence as a starting point for further investigation.
A hypothesis is used in an experiment to define the relationship between two variables. The purpose of a hypothesis is to find the answer to a question. A formalized hypothesis will force us to think about what results we should look for in an experiment. The first variable is called the independent variable
i hopes this helps :)
Which action would cause the chair to move to the left?
A. Applying 100 N of force to the chair from the left
B. Applying 100 N of force to the chair from the right
C. Applying 200 N of force to the chair from the right
D. Applying 200 N of force to the chair from the left
SUBMIT
PREVIOUS
Answers
i’m not for sure but i hope this helps!
C) applying 200 N of force to the chair from the right
Which one of the following is the symbol used in a chemical equation for a
gas?
A. (g)
B. (aq)
C. (gas)
D. (a)
Answers
Answer:
A. (g)
Explanation:
Since it asks for a gas, it is A.
Answer:
A (g)
Explanation:
Can anyone explain to me how I solve 3x10^8 / 3.82x10^-7
I know the answer due to referring to the key but I'm not sure how they got it. Answer was 7.85x10^14
Answers
Answer:
You have to do this on a calculator. So when you put it in the calculator you will get 7.85x10^14.
3x10^8 is the speed of light. 3.82x10^-7 is the number in the question.
You can solve it like this
3x10^8
------------------
3.82x10^7
But you would do this on a calculator.
The most important ELEMENT found in all living things is
A. Oxygen
B. hydrogen
C. Nitrogen
D. Carbon
Answers
Answer:
A. Carbon hope this helps
Answer:
D. Carbon. I guess that's the answer
2. Which atom is larger, Na or Al? Explain why.
Answers
Answer:
Na
Explanation:
Because it has the highest protons and electrons(Atomic mass)
hello~i will really appreciate it if you answer all this♡
☆
1.How many valence electrons do noble gases like Ne,Ar and Kr have?
a.1.
b.2
c.6
d.7
2.The following describe ionic bonding,EXCEPT____.
a.It involves the transfer of electrons.
b.It involves sharing of electrons.
c.atoms either gain or lose electrons.
d.It is a bond between a metal and a non-metal.
3.Which of the following pairs of atoms is most likely to form a covalent compound?
a.C,O
b.Na,O
c.Mg,Br
d.Ba,CI
4.Which of the following is a metal?
a.O
b.S
c.K
d.C
5.Which is not a type of a chemical bonding?
a. Polar bonding
b.Metallic bonding
c.ionic bonding
d.covalent
||. A. Use Lewis structures to show . the transfer of electrons in the given combinations.
1.K +Br
2.Ba + I
3.Be + O
4.Na + S
5.AI + F
B.What ionic charge will the following elements have?PLEASE JUSTIFY YOUR ANSWER.
1. Group 2A
2. Group 5A
3.Group 6A
C.Predict whether the bonding in the oxides of the following elements is covalent or ionic.EXPLAIN YOUR ANSWER.
1.Aluminum
2.Magnesium
3.Phosphorus
4.silicon
5.sodium
|||. Write the electron configuration of the following elements.
1. Ti
2. V
3. Se
4. Ag
5. Zr
thank you!
to your hardwork★
Answers
Explanation:
1)Noble gases have stable valence electron of 2 and 8.
2)B- ionic compounds do not require sharing of electron.
3)B- sodium and oxygen will likely form a covalent compound.
4) C- potassium
5) A- polar bonding
6)
BE FIRST TO ANSWER FOR SUM GOOD!!!!!:D
Answers
can anybody help me? ill mark brainliest!!! please ITS TIMED
Answers
Density = Mass/Volume but it can also be rearranged to:
Mass = Volume x Density
Given in the question:
Volume - 44.9 cc
Density - 19.3 g/cc
Calculation
Mass = Volume x Density
= 44.9 x 19.3
= 866.57 g
How has cooperation played a role in life's major evolutionary transitions?
Answers
Answer:
The cooperation of a species is shown throughout history. Including in our history. Where it be physical evolution or technological. We have helped each other with building, advice, locations, Reproduction, etc.
Formula for all possible isomers of hexane
Answers
Answer:
1) n-Hexane. 2) 2-Methyl pentane(IUPAC name) or Isohexane(common name). 3) 2,2-Dimethylbutane(IUPAC name) or Neohexane(common name). 4) 3-Methylpentane
Explanation:
Which option is a mixture? a.carbon dioxide b. air c. oxygen d. carbon
Answers
Answer:
Air
Explanation:
Did test 100
Please help I’ll give brainiest!
Answers
Answer:
Im sorry if u get it worng but is it the 3rd one?
Explanation:
please help!! my grades dying
15 points
Answers
Answers-in-bold:
There are two common temperature scales. On the Fahrenheit scale, water freezes at 32 degrees. The Celsius scale divides the interval between the freezing and boiling points of water into 100 degrees.
what are Atoms?
what do they do?
Answers
Answer:
atoms are small particles that make up everything even living things and non living things
Explanation:
Find the mass of an object that has a density of 1.5g/cm^3 and has a volume of 8cm^3 power
Answers
Answer:
The answer is 12 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume = 8 cm³
density = 1.5 g/cm³
We have
mass = 8 × 1.5
We have the final answer as
12 gHope this helps you
.) If a solution had a pH level of 13.2, it would be considered a:
O A. strong base
O B. weak base
O C. strong acid
O D. weak acid
Answers
A is the correct answer.
Remember, the high pH numbers are bases and the low ones are acidic.
After a particularly fierce blow, he crawled to his feet, too dazed to rush. . . . All the pain he had endured was as nothing compared with the exquisite agony of this. With a roar that was almost lionlike in its ferocity, he again hurled himself at the man. But the man, shifting the club from right to left, coolly caught him by the under jaw, at the same time wrenching downward and backward. Buck described a complete circle in the air, and half of another, then crashed to the ground on his head and chest.
What is the man’s role in this excerpt?
The man is the protagonist because he is the main character.
The man is the protagonist because he proves his superior strength.
The man is the antagonist because he reveals his cruel nature.
The man is the antagonist because he is opposing Buck.
Answers
Answer:
D. The man is the antagonist because he is opposing Buck.
Explanation:
I just took the quiz.
An unknown metal has a density of 10.51 g/ml and a mass of 287.8 g. What is the
unknown metal's volume?
Answers
Answer:
27.3834443387 so B
Explanation:
M/D=V
287.8/10.51=V
V=27.3834443387
Answer:
27.38
Explanation:
287.8 Divided by 10.51 = 27.38
Please mark brainliest if helped
Helium gas (He) is an element and not a compound. Why is this true?
Answers
Calculate the entropy change when 4.31 g of H2 reacts with O2 according to the reaction
2 H2(g) + O2(g) → 2 H2O(l)
at 298 K and 1 atm pressure. The standard molar enthalpy of formation of H2O(l) at 298 K is −285.8 kJ/mol. The corresponding free energy of formation is −237.2 kJ/mol.
Answer in units of J/K.
Answers
Answer:
Explanation:
ΔG = Δ H - T ΔS
Given , ΔG = -237.2 kJ / mol
Δ H = - 285.8 kJ / mol
T = 298
Putting the values in the equation
-237.2 = - 285.8 - 298 x ΔS
ΔS = .163 kJ / mole K
moles of water formed = 4.31 / 2 = 2.155
entropy change required = 2.155 x .163 kJ / K
= 351.26 J / K .