Lakes dry up. Shortage of water. Decrease in humidity.
Select the correct answer.
In this reaction, what effect does a change in the concentration of substances have on the reverse reaction rate?
CaCO3(s) ⇌ CaO(g) + CO2(g)
A.
The rate of the reverse reaction increases with an increase in the concentration of CaCO3(s).
B.
The rate of the reverse reaction increases with an increase in the concentration of CaO(g) and CO2(g).
C.
The rate of the reverse reaction decreases with a decrease in the concentration of CaCO3(s).
D.
The rate of the reverse reaction decreases with an increase in the concentration of CaO(g) and CO2(g).
E.
The rate of the reverse reaction increases with a decrease in the concentration of CaO(g) and CO2(g).
Answer:
A. The rate of the reverse reaction increases with an increase in the concentration of CaCO3(s)
Explanation:
If the concentration of a reactant has increased, The substance will shift in the direction of the reaction that uses the reactants, So that the Reactants substance Increases.
Leila made herself a cup of hot chololate weighing 150 grams. If she started with 125 grams of milk, how many grams of hot chocolate mix did she add?
Answer:
150g-125g
=25 of hot chocolate mix
A solute that has been dissolved in a solvent ________.
Select one:
a. cannot be recovered by any means
b. can be recovered by a process involving its chemical properties
c. can be recovered by a process involving its physical properties
d. is chemically changed
b or c
i think c im not sure
i hope it's right!!
A solute that has been dissolved in a solvent b) can be recovered by a process involving its chemical properties.
What is a solute?A substance that is dissolved in a solution is referred to as a solute. In fluid solutions, the quantity of solvent present is extra than the quantity of solute. One best example of solute in our each day hobby is salt and water. Salt dissolves in water and therefore, salt is the solute.
What's a solvent?A usually liquid substance is able to dissolve or disperse one or more other substances. some thing that provides a solution. some thing that gets rid of or attenuates something especially undesirable.Learn more about the solution here: https://brainly.com/question/723406
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Picture a neutral P atom. This neutral atom will have
valence electrons. To reach a more stable configuration, this atom will
(gain, lose) electrons. The charge of the ion that forms will be
ASAP PLEASE
Answer:
It will have 5 valence electrons as its in group 5.
The atom will gain as its closer to the full configuration 8.
The charge will be 3- as it will gain 3 electrons.
Why does my hand get cold when I pick up a snowball?
Answer:
Cause snow is cold.
Explanation:
THANK YOU
Plants can provide the materials that animals use in cellular respiration, and animals can provide some of the materials that plants use for photosynthesis. The image below shows the relationship between photosynthesis and cellular respiration. According to the diagram, how does cellular respiration aid the process of photosynthesis?
It produces ATP.
It produces glucose.
It produces mitochondria.
It produces carbon dioxide
Answer:
it produce atp
Explanation:
.............
Cellular respiration is a metabolic process that occurs in the cells of an organism. Carbon dioxide from cellular respiration aids the process of photosynthesis.
What are cellular respiration and photosynthesis?Cellular respiration is a process that takes place in the organism's cell where the cellular oxygen or chemical energy gets utilized and converted to ATP and waste like carbon dioxide.
The carbon dioxide released by the organism in the atmosphere is used by plants in the process of photosynthesis. Photosynthesis is a process that utilizes carbon and water to form glucose and oxygen.
Therefore, cellular respiration supports the process of photosynthesis by option D. producing carbon dioxide.
Learn more about cellular respiration and photosynthesis here:
https://brainly.com/question/18812151
What is the practical application of melting point in the study of matter?
Answer:
Melting points are often used to characterize organic and inorganic crystalline compounds and to ascertain their purity. Pure substances melt at a sharp, highly-defined temperature (very small temperature range of 0.5 – 1 °C) whereas impure, contaminated substances generally exhibit a large melting interval.
Explanation:
I hoped this helps a bit! ^^
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What is the volume occupied by 40 grams of argon gas (Ar) at standard conditions?
Answer:volume occupied by 40 grams of argon gas (Ar) at standard conditions = 22.443L
Explanation:
Using the ideal gas law that
PV =nRT
Where p =pressure,
V = volume,
n = number of moles
R = gas constant, and
T= temperature in Kelvin.
Since Argon is at STP( Standard conditions), This means that temperature is 273.15 K and pressure is 1 atm
Also the gas constant= 0.08206 L atm/K mol . we are using this value because its units match the units of our values to aid easy calculation
So,
Number of moles = Mass/ Molar mass
=40g/39.948 g/mol
Number of moles of Argon=1.0013moles.
Now Bringing
pV= nRT
V= nRT/p
=(1.0013mol x 0.08206 L atm/K mol x 273.15 K ) /1atm
Volume =22.443L
If a cell were compared to a school, which part of the school would represent the cell's nucleus?
ОА the classroom walls because they give the structure to the school
B
the cafeteria cooks because they make food for the entire school
С
the principal because he or she controls all the activity in the school
D
the fence because it controls what enters and exits the school
Answer:
C-The principal because he or she controls all the activity in the school
a train is traveling on a straight track. it travels 200 kilometers in 4 hours, what measure can you find with these values?
Answer:
200 km is a measure of distance 4 hours is a measure of time Hence you can measure rate of change, instaneous rate of change, linear change and distribution of timeUpdated: SpeedHydrogen gas reacts with oxygen gas to produce water. How many moles of
hydrogen do you need to get 120 grams
of water?
Answer:Two
Explanation:
While the Bohr model fails to show the true shape of the electron orbitals with in an atom, it is still used because it ?
Answer:
Is used to predict the spectra of hydrogen and hydrogen like species
Explanation:
The Bohr's model of the atom was propounded by Neis Bohr. In his theory, an atom is composed of quantized energy levels in which electrons may be found.
The transition of an electron between energy levels leads to the absorption or emission of energy in the form of a photon of visible light. The energy absorbed or emitted depends on the energy difference between the two energy levels.
The model is successful at predicting the electronic spectra of one electron species but totally fails when the specie has more than one electron. Also, the model fails to show the true shape of the electron orbitals within an atom.
Please help me with this homework
Answer:
dude
Explanation:
dude use a calculator, \ USE A CALCULATOR
what special requirements would a helicopter rotor need to have in order to make a helicopter flight possible on the red planet.
Answer:
Explanation:
may u explain what u mean then i will be able to help u because i like knows this but what u mean will be better so i can tell u the right answer thanks have a good day
Example #1: 0.450 mole of Fe contains how many atoms?
Answer:
Number of Fe atoms = 2.709 × 10^23 atoms.
Explanation:
Given the following data;
Number of Fe moles = 0.450 mole
We know that Avogadro constant is equal to 6.02 * 10^23 mol¯¹
Number of Fe atoms = number of Fe moles * Avogadro constant
Substituting into the equation, we have;
Number of Fe atoms = 0.450 × 6.02 * 10^23
Number of Fe atoms = 2.71 × 10^23 atoms.
Note: Fe is the symbol for the chemical element Iron.
An ice cube, a glass of cold water, and a swimming pool are each exposed to the same amount of sunlight on a hot day. After five minutes, the ice cube is
melted and the cold drink is two degrees warmer, but the temperature of the swimming pool remains unchanged. What is the best explanation for these
observations?
A. The ice cube has a higher heat capacity than the glass of water and the pool.
B. The ice cube has a lower heat capacity than the glass of water and the pool.
C. The ice cube and the glass of water have higher heat capacities than the swimming pool.
D. The ice cube and the glass of water have lower heat capacities than the swimming pool.
Answer:
D
Explanation:
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Answer:
C. the ice cube and the glass of water have higher heat capacity than the swimming pool
there's 4.1*10^25 particles of calcium phosphate, how many grams of calcium phosphate is that
Mass of Calcium phosphate : = 21127.7 g
Further explanationGiven
4.1 x 10²⁵ particles of Calcium phosphate
Required
mass
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
mol Calcium phosphate :
n = N : No
n = 4.1 x 10²⁵ : 6.02 x 10²³
n = 68.11
mass Calcium phosphate Ca3(PO4)2 :
= mol x MW
= 68.11 x 310.2 g/mol
= 21127.7 g
= 21.13 kg
4.) The temperature of solid silver increases from 30C to 40C by the addition of 117.5
joules of heat. What is the mass of the silver?
Answer:
The mass of silver is 49 g (0.049 kg).
Explanation:
Initial temperature = [tex]30^{o}[/tex]C
Final temperature = [tex]40^{o}[/tex]C
Quantity of heat required = 117.5 J
Specific heat capacity of silver = 0.240 J/g[tex]^{o} C[/tex]
mass of the silver can be determined by;
Q = mcΔθ
Where: Q is the quantity of heat required, m is the mass of substance, c is the specific heat capacity of the substance and Δθ is the change in temperature.
So that,
117.5 = m x 0.240 x (40 - 30)
117.5 = m x 0.24 x 10
= 2.4m
m = [tex]\frac{117.5}{2.4}[/tex]
= 48.9583
m ≅
m = 49 g
The mass of silver is 49 g (0.049 kg).
PLEASE HELP TEST
does anyone know the answer???? density question
Answer:
The answer is honey.
Explanation:
Answer: alcohol
Explanation:
The following chemical reaction takes place in aqueous solution:
Mg(NO3)2(aq)+2 NaOH(aq) --Mg (OH)2(3)+2 NaNO3(aq)
Write the net ionic equation for this reaction.
Answer:
[tex]Mg^{2+}+2OH^{-}=>Mg(OH)2[/tex]
Explanation:
The diagram below illustrates changes over time in a population of foxes in the wild,
X
What process is illustrated in the diagram?
extinction
overproduction
O natural selection
O artificial selection
Answer:
natural selection
Explanation:
Please help. I’m stuck
A chemical process used to produce ethanol as a fuel additive was expected to produce 5,000 kilograms of ethanol based on the amounts of starting materials used, but only 4,760 kilograms were produced. What was the percent yield for ethanol in this process? A)1.09 percent B)4.80 percent C)95.2 percent D)105 percent
Answer:
The percent yield for ethanol in this process is 95.2%
Explanation:
Yield is the ratio between the amount of product actually obtained in the reaction and the maximum amount of product that could have been obtained if the reagents had been completely consumed.
The theoretical yield is the yield is the maximum you can get in a reaction.
On the other hand, the actual performance shows what you really get in experimentation. It is generally less than the theoretical yield.
So, the percentage return is the actual return times the theoretical return multiplied by 100.
So, in this case the percentage yield will be calculated as:
[tex]percent yield=\frac{4,760 kg}{5,000 kg} *100[/tex]
percent yield= 95.2%
The percent yield for ethanol in this process is 95.2%
How many moles of NaF are produced in the resction between sodium bromide and calcium fluoride when 550 grams of sodium bromide are used
Answer: 5 moles of NaF would be produced when 550 grams of Sodium bromide are used.
Explanation:
From the question, the balanced chemical formula is illustrated below:
2NaBr + CaF2 → 2NaF + CaBr2
From the equation above;
Molecular mass of NaBr = 23 + 80 = 103g/ mol
Molecular mass of CaF2= 40+ (19×2)= 78g/ mol
Molecular mass of NaF = 23+19 = 42g/ mol
From the balanced chemical equation;
2 moles of NaBr reacted with 1mole of CaF to give 2 moles of NaF.
That is, 2 moles of NaBr= 2× 103 = 206g
2moles of NaF = 2×42= 84g
If 206g of NaBr yielded 84g of NaF
Therefore 550g of NaBr will yield Xg of NaF
X= 550×84/206
X= 224.27g of NaF
But 42g = 1 mole of NaF
Therefore 224.27g = X mole of NaF
X= 224.27 ×1/42
X is approximately 5moles.
Explain what you know about acid rain and why it is bad.
Answer:
Explanation:
Acid rain that seeps into the ground can dissolve nutrients, such as magnesium and calcium, that trees need to be healthy. Acid rain also causes aluminum to be released into the soil, which makes it difficult for trees to take up water. ... The acidic clouds and fog strip important nutrients from their leaves and needles.
C-14 has a half life of 5730 years, an artifact gives 4 counts per minute on a detector, living matter gives a count of 32. What is the estimated age of the artifact?
Answer:
17188 years
Explanation:
Given that;
0.693/t1/2 = 2.303/t log (Ao/A)
Where;
t1/2 = half life of carbon -14
t = time taken
Ao = activity of a living sample
A activity of the artifact
0.693/5730 = 2.303/t log (32/4)
1.21 * 10^-4 = 2.303/t * 0.9031
1.21 * 10^-4 = 2.0798/t
t = 2.0798/1.21 * 10^-4
t = 17188 years
A basketball has a mass of 0.625 kg. Most basketball hoops are at a height of 3 m above the ground. What is the gravitational potential energy of a basketball just before it goes through the hoop?
The gravitational potential energy of a basketball : PE = 18.375 J
Further explanationGiven
height = h = 3 m
mass = 0.625 kg
Required
The potential energy
Solution
The energy produced from its position is called potential energy (PE)
which can be formulated as:
PE = m. g. h (g = 9.8 m/s²)
Input the value :
PE = 0.625 x 9.8 x 3
PE = 18.375 J
Wich of these BEST shows a change from potential to kinetic energy?
Choices
A: A sandwich at lunch helps a students run a race.
B: Electricity making a bulb light up.
C: Transfer of heat trough electromagnetic waves.
D: A ball sitting at the top of the hill.
Which of the following statements about the domestication of animals during the agricultural revolution is FALSE?
A. The domesticated the animals so that they could use them as draft animals to help them on the farm.
B. The domesticated the animals so that they could use them for food (e.g., meat, milk, eggs, etc.)
C. They domesticated the animals so that they wouldn't have to worry about being attacked by wild animals.
D. They domesticated the animals so that they could use their fur for making clothes.
Answer:
b is the answer my brudaa
Explanation:
Help asap please!!!!
will give brainliest
Answer:
24.5°C
Explanation:
im so sorry if i got it wrong but u dont gotta mark me as brainliest cuz im dum:(