Answers
Answer:
1. a b c
2. a
3. c
4. west to east
Related Questions
If the birthrate is higher than the death rate, the population increases in size. True or false
Answers
Answer:
true
Explanation:
Answer:
This is true
Explanation:
if birthrate is higher than death rate then more babies= higher population
There are three isotopes of X element (X):
X-17 isotope: atomic mass17.2 amu, abundance:78.99%
X-18isotope: atomic mass 18.1 amu, abundance 10.00%
X-19isotope: atomic mass:19.1 amu, abundance: 11.01%
Calculate the average atomic mass of X.
Answers
Answer:
Average atomic mass = 17.5 amu.
Explanation:
Given data:
X-17 isotope = atomic mass17.2 amu, abundance:78.99%
X-18isotope = atomic mass 18.1 amu, abundance 10.00%
X-19isotope = atomic mass:19.1 amu, abundance: 11.01%
Average atomic mass of X = ?
Solution:
Average atomic mass = (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 = (78.99×17.2)+(10.00×18.1) +(11.01+ 19.1) /100
Average atomic mass = 1358.628 + 181 +210.291 / 100
Average atomic mass = 1749.919 / 100
Average atomic mass = 17.5 amu.
pleaseeee help me asap
Answers
Answer : i think the answer is A
Explaination : its not D , C i feel like it would be bigger so there would be more transpiration an B less would not have bigger so i hope this helps have a good day ☆
In the Haber reaction, patented by German chemist Fritz Haber in 1908, dinitrogen gas combines with dihydrogen gas to produce gaseous ammonia. This reaction is now the first step taken to make most of the world's fertilizer. Suppose a chemical engineer studying a new catalyst for the Haber reaction finds that 112. liters per second of dinitroge are consumed when the reaction is run at 17.2°C and 0.88atm.
Required:
Calculate the rate at which ammonia is being produced. Give your answer in kilograms per second. Be sure your answer has the correct number of significant digits.
Answers
Answer: Rate = 0.14 kg/s
Explanation: The Haber reaction is demonstrated below in the balanced equation
[tex]N_{2}+3H_{2}[/tex] → [tex]2NH_{3}[/tex]
To determine the rate of ammonia production, we need to determine the amount of nitrogen gas is being consumed.
As it is a gas, we can find moles by using Ideal Gas Law, whose formula is
PV = nRT
P is pressure
V is volume
n is moles
R is universal gas constant
T is temperature in Kelvin (K)
For the nitrogen gas, temperature will be
T = 273 + 17.2
T = 290.2 K
Solving for moles:
[tex]n=\frac{PV}{RT}[/tex]
[tex]n=\frac{0.88(112)}{0.082(290.2)}[/tex]
n = 4.14 moles
In the Haber reaction, it is consumed 4.14 moles per second of nitrogen gas.
From the balanced equation, we know 1 mol of nitrogen gas produces 2 moles of ammonia, so
[tex]n_{NH_{3}}[/tex] = 2(4.14)
[tex]n_{NH_{3}}[/tex] = 8.48 moles
Number of moles (n) is mass in grams divided by molar mass of the compound:
[tex]n=\frac{m}{M}[/tex]
Molar mass of ammonia is M = 17.031 u, so mass produced is
m = n.M
m = 8.48(17.031)
m = 144.42 g
In kilograms, m = 0.14 kg
When consuming N₂ at a rate of 4.14 moles/s, it will be produced ammonia at a rate of 0.14 kg/s
Julie took a road trip to Canada. She traveled a total of 1,750 miles in 25 hours. Calculate Julie's average speed.
Answers
Answer:I think it’s 70 her speed
Explanation: What I did was divid 1,750/25 and it got me 70
Help me pls I’m so lost pls ASAP thank you
Answers
Answer:
The 2nd answer.
Explanation:
DNA makes people who are related look similar to eachother.
Which statement best describes what happens during a chemical change?
Both the identity and the properties of a substance change.
Some properties of a substance change, but its identity remains the same.
The chemical properties of a substance change, but its physical properties rema
The physical properties of a substance change, but its chemical properties rema
Answers
Answer:
Both the identity and the properties of a substance change.
Explanation:
During most chemical reactions, both the identity and the properties of substances changes. The chemical and physical properties of a substance often changes during this kind reaction.
A chemical change has the following properties:
A new kind of substance forms. It is always accompanied by energy changesInvolves a change in mass of the substanceConsiderable amount of energy is involved in this reaction. The process is irreversibleAnswer:
Both the identity and the properties of a substance change.
Explanation:
In a chemical change, the matter gets transformed or changed into a new substance. In doing this, the identity of the substance, and its properties change as well.
- I got the question right on the quiz and got 100%
Hope this helps!
Acetylene gas, C2H2, reacts with oxygen according to the following equation. If 52.0 g of acetylene react completely with sufficient oxygen, how many grams of carbon dioxide are produced
Answers
Answer:
176 g of CO₂.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is illustrated below:
2C₂H₂ + 5O₂ —> 4CO₂ + 2H₂O
Next, we shall determine the mass of C₂H₂ that reacted and the mass of CO₂ produced from the balanced equation.
This is illustrated below:
Molar mass of C₂H₂ = (2×12) + (2×1)
= 24 + 2 = 26 g/mol
Mass of C₂H₂ from the balanced equation = 2 × 26 = 52 g
Molar mass of CO₂ = 12 + (2×16)
= 12 + 32 = 44 g/mol
Mass of CO₂ from the balanced equation = 4 × 44 = 176 g
From the calculations made above,
52 g of C₂H₂ reacted to produce 176 g of CO₂.
1s2 2s2 2p6 3s2 3p6 4s2 3d 10 4p6 5s2 4d7 element electron configuration?
Answers
Answer:
antimony
Explanation:
The representation of the electrons in the shell is called electronic configuration.
The correct answer is antimony
The shell is as follows:-
SPDFThese are the shells in which electrons are filled.
The total number of electrons is 2+2+6+2+6+2+10+6+2+7= 45
After calculating the electrons, the total number of electrons is 45 which is the atomic number of antimony.
Hence, antimony is the correct option.
For more information, refer to the link:-
https://brainly.com/question/15804584
? January 5/6. What can you do differently for
the last half of the year in science? Whether it is
improving study skills, turning work in on time,
etc
Answers
Answer:
Explanation:
I'd say art
answer choices
a. 13
b. 15
c. 28
d. 30
:))
Answers
The answer is b. 15
Answer:
15 neutrons
Explanation:
Number of neutrons = atomic mass - number of protons.
So Neutrons = 28 - 13 protons
(Since atom is neutral, number of electrons = number of protons, which is how I get the 13 protons)
Neutrons = 15
Based on the equation below, how many moles of aluminum sulfate (Al2(SO4)3) will be produced from the reaction of 5.8 moles of aluminum hydroxide (Al(OH)3) and excess sulfuric acid (H2SO4)?
Answers
2.9
Explanation:
1- we can see that for every 2 moles of aluminum hydroxide 1 mole of aluminum sulfate is made so we can make a relation
What is the reaction??
Answers
WILL GIVE BRAINLEST PLZZZZ
Question 1 (2 points)
The highest point of a wave is called the
Question 1 options:
Wavelength
Crest
Trough
Top
Question 2 (2 points)
Which statement BEST explains why the Moon is visible from the Earth?
Question 2 options:
The Moon reflects light from the Earth.
The Moon reflects light from the Sun.
The Moon produces its own light through radiation.
The Moon is always lit up by the Sun for us to see.
Question 3 (2 points)
Which of these is NOT a factor that is considered when describing the climate of a region?
Question 3 options:
The population of the region
The number of mountains nearby
The amount of precipitation
Distance from the ocean
Question 4 (2 points)
Which planets are small, dense, and have a rocky outer surface?
Question 4 options:
All Planets
Inner Planets
Gas Giants
Outer Planets
Question 5 (2 points)
Which of the following is an example of a climate region?
Question 5 options:
Tropical
Snowy
Rainy
Sunny
Question 6 (2 points)
Which of the following is the LEAST LIKELY to directly affect a location's weather?
Question 6 options:
Air Pressure
Pollution
Air Temperature
Cloud Cover
Question 7 (2 points)
When people on the Earth cannot see the Moon, which phase is it in?
Question 7 options:
Full Moon
Waning Crescent
New Moon
Waxing Gibbous
Question 8 (2 points)
If you were testing how effective different dish soaps were at cleaning grease off of dishes, the dependent variable would be the:
Question 8 options:
types of grease
cleanliness of washed dishes
different dish soaps
temperature of the wash water
Question 9 (2 points)
Which of the following is NOT true about comparisons between analog and digital signals?
Question 9 options:
Digital signals are more prone to distortion.
Analog signals are used to convert sound waves into electronic signals.
Digital signals are pulses of voltage that switch currents on an off in devices like computers.
Analog signals are more prone to distortion.
Question 10 (2 points)
Which of the following statements best describes what will happen when white light hits a red object?
Question 10 options:
All wavelengths of the light are reflected.
Red wavelengths are reflected while all others are absorbed.
All wavelengths of the light are absorbed.
Red wavelengths are absorbed while all others are reflected.
Question 11 (2 points)
Long hair in the laboratory must be
Question 11 options:
cut short
held away from the experiment with one hand
always neatly groomed
tied back
Question 12 (2 points)
When the Moon is positioned so that the entire lit half is facing AWAY from the Earth it is in which phase?
Question 12 options:
Full Moon
New Moon
Waxing Gibbous
Waning Crescent
Question 13 (2 points)
The lowest part of a wave is called the
Question 13 options:
Wavelength
Lowpoint
Crest
Trough
Question 14 (2 points)
Which statement best describes how the Sun and the planets are related?
Question 14 options:
The planets revolve around the Sun.
The Sun rotates on its axis.
The Sun revolves around the planets.
Planets rotate on their axes.
Question 15 (2 points)
The number of light waves that occur in one second is known as the wave's
Question 15 options:
energy
movement
frequency
amplitude
Answers
Answer:
Explanation:
This is what I would answer and I might be wrong***
1. Crest
2. The Moon reflects light from the Sun
3. Population of the region
4. Inner Planets
5. Tropical
6. Pollution (I am not 100% but it would make sense because pollution is long term consequences)
7. New Moon
8. Cleanliness of washed dishes
9. Analog signals are more prone to distortion.
10. Red wavelength are reflected while all others are absorbed
11. Tied back (I would assume)
12. New Moon (I think)
13. Trough
14. The planets revolve around the Sun
15. Frequency
16. Decreases
17. furthest; least
18. ? sry I don't get what the question is trying to ask.
19. wavelength
20. independent; dependent
21. Sun; Earth
Answer:
1) Crest
2)D
3) distance from ocean
4) outer planets
5)tropical
6)air pressure
7)new moon
8)Temp of water
9)C i think
10)B
(still finding answers)
Explanation:
Which part of this chemical process requires energy?
NaOH + HCl → NaCl + H20
A. Breaking bonds in NaOH and HCI
B. Forming bonds in NaCl and H20
C. Forming bonds in NaOH and HCI
D. Breaking bonds in NaCl and H20
Answers
in the equation of reaction given, breaking bonds in NaCl and H20 requires energy as they are both endothermic reactions.
What is a chemical reaction?A chemical reaction is a change which results in the permanent rearrangements of atoms of a substance and the formation of a new substance.
In a chemical reaction, bond breaking in endothermic reactions requires energy.
Therefore, in the equation of reaction given, breaking bonds in NaCl and H20 requires energy.
Learn more about bond breaking energy at: https://brainly.com/question/26369483
#SPJ2
Answer:
Breaking bonds in NaOH and HCl
Explanation:
its the correct answer
When an animal eats corn or peanuts, will it also eat the seeds?
Answers
Answer:yes
Explanation:it doesnt know
The reaction of hydrogen sulfide(g) with oxygen(g) to form water(l) and sulfur dioxide(g) proceeds as follows: 2H2S(g) 3O2(g)2H2O(l) 2SO2(g) When 9.82 g H2S(g) reacts with sufficient O2(g), 161 kJ is evolved. Calculate the value of rH for the chemical equation given. kJ/mol
Answers
Answer: The value of [tex]\Delta H[/tex] is 1118 .
Explanation:
To calculate the number of moles, we use the equation:
[tex]\text{Moles of solute}=\frac{\text{given mass}}{\text{molar mass}}[/tex]
[tex]\text{Moles of} H_2S}=\frac{9.82g}{34.1g/mol}=0.288mol[/tex]
The balanced chemical reaction is:
[tex]2H_2S(g)+3O_2(g)\rightarrow 2H_2O(l)+2SO_2(g)[/tex]
Given :
Energy released when 0.288 mole of [tex]H_2S[/tex] is reacted = 161 kJ
Thus Energy released when 2 moles of [tex]H_2S[/tex] is reacted = [tex]\frac{161}{0.288}\times 2=1118kJ[/tex]
Thus the value of [tex]\Delta H[/tex] is 1118.
What technology allowed scientists to collect new data on layers of the earth
Answers
Basically the answer is Seismic-Wave Data :)
A chemist must dilute 97.1 ml of aqueous magnesium fluoride solution until the concentration falls to 389 microMolarity . He'll do this by adding distilled water to the solution until it reaches a certain final volume. Calculate this final volume, in liters. Round your answer to significant digits.
Answers
Answer:
0.302L
Explanation:
...97.1mL of 1.21m M aqueous magnesium fluoride solution
In this problem the chemist is disolving a solution from 1.21mM = 1.21x10⁻³M, to 389μM = 389x10⁻⁶M. That means the solution must be diluted:
1.21x10⁻³M / 389x10⁻⁶M = 3.11 times
As the initial volume of the original concentration is 97.1mL, the final volume must be:
97.1mL * 3.11 = 302.0mL =
0.302L
17. AgNO3 + KCI
AgCl + KNO3
Answers
Explanation:
double replacement is type of reaction of this.it is already balanced.
Which atom has multiple oxidation states and
forms an ion that is colored when in solution?
A) F
B) Zn
C) C1
D) Cu
Answers
Answer:
Copper
Explanation:
Can we predict geological events based on the type of tectonic plates interaction?
PLZ HELP GIVING BRANLIEST
Answers
Answer:
1. Volcanoes and minor earthquakes
2. Volcanoes, earthquakes and fold mountains.
3. Earthquakes and fold mountains.
4. Magma from volcanoes is filled with nutrients that makes land fertile.
Explanation:
Question 4 (1 point)
60.5 mL of 0.223 M HI is mixed with 86.0 mL of a buffer system composed of 0.385 M sodium acetate and 0.410 M acetic acid. Find the pH of
the final solution
Ko of acetic acid = 1.8 E-5
4561
o a
Ob
Ос
Od
4.673
4.450
4.349
Answers
Answer:
pH = 4.349
Explanation:
When HI is added to sodium acetate, CH3COONa, acetic acid is produced as follows:
CH3COONa + HI → CH3COOH + NaI
That means the moles of HI added are the moles of acetic acid produced and the moles of sodium acetate consumed.
Moles of HI:
0.0605L * (0.223mol/L) = 0.01349mol
To find pH of the buffer (Mixture of weak acid, acetic acid, and conjugate base, sodium acetate) we need to solve H-H euation:
pH = pKa + log [CH3COONa] / [CH3COOH]
Where pKa is -log of Ka of the acid: -log1.8x10⁻⁵ = 4.745
And [] could be taken as moles of each specie
Moles CH3COONa:
Inital moles: 0.086L * (0.385mol/L) = 0.03311
Final moles: 0.03311mol - 0.01349mol = 0.01962mol CH3COONa
Moles CH3COOH:
Inital moles: 0.086L * (0.410mol/L) = 0.03256
Final moles: 0.03256mol + 0.01349mol = 0.04875mol CH3COOH
pH = 4.745+ log [0.01962mol CH3COONa] / [0.04875mol CH3COOH]
pH = 4.3497
Rigth answer is:
4.349
So its not A so its B C or D plz help
Answers
Answer:
the answer is B
hope this helped!
The rate law for the decomposition of phosphine () is It takes 135. s for 1.00 M to decrease to 0.250 M. How much time is required for 3.00 M to decrease to a concentration of 0.450 M
Answers
Answer:
189.71 secs
Explanation:
We know that decomposition is a first order reaction;
So;
ln[A] = ln[A]o - kt
But;
[A]o = 1.00 M
[A] = 0.250 M
t =135 s
Hence;
ln[A] - ln[A]o = kt
k = ln[A] - ln[A]o/t
k = ln(1) - ln(0.250)/135
k =0 - (-1.386)/135
k = 1.386/135
k= 0.01
So time taken now will be;
ln[A] - ln[A]o = kt
t = ln[A] - ln[A]o/k
t = ln (3) - ln(0.450)/0.01
t = 1.0986 - (-0.7985)/0.01
t = 1.0986 + 0.7985/0.01
t = 189.71 secs
A compound has a molar mass of 123.22 g/mol. what is the molecular formula of a substance that has this molar mass?
A. CoH4
B. PSF3
C. SrS
D. ZrO2
Answers
The answer is (3). The number of Sr is the same so if the compound has the smallest gram formula mass, it has the highest percent composition by mass of strontium. So the answer is (3).
The study of chemical is called chemistry.
The correct answer to the question is option C that is C SrS.
What is molecular mass?The molecular mass is the mass of a given molecule: it is measured in daltons. Different molecules of the same compound may have different molecular masses because they contain different isotopes of an element.The molecular mass of Sr is 87.62 and sulfur is 32 after joining these we will get 123.22.
Hence, the correct answer is option C.
For more information about the mass, refer to the link:-
https://brainly.com/question/787658
The table compares the final cost of
groceries after a coupon is used.
Cost Before
Coupon (a)
$20
$21
$22
$23
Cost After
Coupon (b)
$17.50
$18.50
$19.50
$20.50
Which equation models the relationship?
Answers
Answer:
y = -2.5 + x
Explanation:
Given the data:
__X____Y
$20 __$17.50
$21 __ $18.50
$22__ $19.50
$23__ $20.50
Using a linear regression calculator :
The linear regression model obtained is :
y = -2.5 + x
Where ; - 2.5 = intercept ; gradient / slope = 1
Write as a single exponent in simplest form: y⁸×y⁵
Answers
Answer:
y¹³
Explanation:
because it's a multiplication question we add exponents
8 + 5 = 13
so it's y¹³
Calculate the moles of benzoic acid (C6H5COOH) in a 55.66 g sample of benzoic acid
Answers
−1
Morality of Ba(OH)
2=0.120mol/L2E6H5COOH+Ba(OH) 2→2H2+Ba(C6H5COO) 2
From the given Molar mass, we find the number of moles of Benzoic acid and Barium
hydrocide.
Moles of Benzoic acid = MolarMass
GivenMass= 122.10.2=0.00163 Moles
Moles of Ba(OH) 2= 20.00163=0.000815
Now, Morality of Ba(OH)
2= LitreofSolutionmolesofsolute=0.120M is required 1 Litre,
So 0.000815M is required in
0.1201 ×0.000815 =0.00679=6.
What cation ion is formed from magnesium iodate
Answers
Answer:
Explanation:
Each magnesium atom loses two electrons and each iodine atom gains one electron. So there should be a 1-to-2 ratio of magnesium ions to iodide ions.
