Answer:
47.3 moles of [tex]Ca(OH)_2[/tex] are in 3.5 kilograms of [tex]Ca(OH)_2[/tex].
Explanation:
[tex]n=\frac{m}{M}[/tex]
Where:
n = Moles of the compound
m= Given mass of the compound
M = Molar mass of the compound
Mass of the calcium hydroxide, m = 3.5 kg = 3500 g (1kg = 1000 g)
Molar mass of the calcium hydroxide = M = 74 g/mol
Moles of calcium hydroxide = n
[tex]n=\frac{3500 g}{74 g/mol}=47.297 mol\approx 47.3 mol[/tex]
47.3 moles of [tex]Ca(OH)_2[/tex] are in 3.5 kilograms of [tex]Ca(OH)_2[/tex].
2. What charge does an electron have? a. Positive b. Negative c. Neutral d. No charge
During a phase change the temperature of a substance
Answer:
remains constant
A 1.0 mole sample of HNO3 is added to water. The final volume of the solution is 1.5 L. Calculate the pH of the Solution
The pH of the solution is 1.12.
HNO₃ is a strong acid, which means it completely dissociates in water to form H⁺ and NO₃- ions.
The number of moles of HNO₃ added is 1.0 mole.
The final volume of the solution is 1.5 L, so the concentration of HNO₃ can be calculated as:
[HNO₃] = number of moles / volume (in liters) = 1.0 mole / 1.5 L = 0.67 M
Since HNO₃ is a strong acid, it completely dissociates to form H+ ions. Therefore, the concentration of H⁺ ions is equal to the concentration of HNO₃:
[H⁺] = [HNO₃] = 0.67 M
Now, we can calculate the pH using the following equation:
pH = -log[H⁺] = -log(0.67) = 1.12
Therefore, the pH of the solution is 1.12.
Classify these elements by whether they get oxidized or reduced in the reactions shown here: 2Ca(s)+ O 2 (g) F 2 (g)+2Li(s) → → 2CaO(s) 2LiF(s
Calcium and lithium are oxidized and Florine and oxygen are reduced.
What are oxidizing agent?Oxidizing agent are defined as a substance or component that participates in an oxidation-reduction reaction and receives electrons from a separate species. The oxidizing agent, often referred to as the electron acceptor, is typically in one of its higher oxidation states since it will receive electrons and be reduced.
Reducing agent are defined as a reactant in an oxidation-reduction reaction that decreases another reactant by discharging electrons to that reactant. Reducing one's consumption of energy-dense foods and canceling undesired magazine subscriptions are two examples. Another example of reduction is to turn off the water when brushing your teeth rather than letting it run the full two minutes.
Thus, calcium and lithium are oxidized and Florine and oxygen are reduced.
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Which statement correctly describes the conservation of matter in a chemical reaction?
A. Different types of atoms may form during the change, but the total mass remains constant.
B. The number of molecules is conserved, so the total mass does not change.
C. Different numbers of atoms may form during the change, but the total mass is unchanged.
D. Atoms of each element are conserved, so the total mass does not change
Considering the definition of the Law of Conservation of Matter, the correct answer is option D. Atoms of each element are conserved, so the total mass does not change.
The Law of Conservation of Matter is also called the law of conservation of mass or the Law of Lomonósov-Lavoisier. This law postulates that "the mass is not created or destroyed, only transformed."
This means that the reagents interact with each other and form new products with physical and chemical properties different from those of the reagents because the atoms of the substances are ordered differently. But the amount of matter or mass before and after a transformation (chemical reaction) is always the same, that is, the quantities of the masses involved in a given reaction must be constant at all times, not changing in their proportions when the reaction ends.
In other words, then the mass before the chemical reaction is equal to the mass after the reaction. The exception to the rule is nuclear reactions, in which it is possible to convert mass into energy and vice versa.
Taking into account the above, the correct answer is option D. Atoms of each element are conserved, so the total mass does not change.
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https://brainly.com/question/5248140?referrer=searchResultshttps://brainly.com/question/9434062?referrer=searchResults You notice that heat is released during a chemical reaction. This reaction is a(n) _______ reaction.
Organisms that can survive well in conditions with changing salinity are well adapted to live in _____.
A) An internal zone
B) The abyssal or deep ocean
C) The pelagic zone
D) Zones with high density
Blank is the theory that explains how large pieces of earths outermost layer move and change shape
which of the following is not an example of a music parameter
Answer:
Fragmentation
Explanation:
APEX
1.the water on the surface of the earth
2. a solution that will conduct an electric current
3. process used by plants to make simple sugars and starches
4. process used to produce fresh water from saline
photosynthesis
desalination
hydropshere
electrolyte
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HELP ASAP!!!!!!!!!!!!!!!!!!!!
The force that slows down and eventually stops a ball you roll across the pavement is called A) kinetic force. B) friction force. C) the slow force. D) potential force.
The ball stops moving because of friction force. Friction is the force that opposes all motion. Therefore, the answer is friction force...
Answer:
friction
Explanation:
took test
what kind of tide does the observer experience when he is between tidal bulges?
What was the hiker's average velocity during part B of the hike? In Part A, a hiker travels four kilometers east from nine to nine-forty-five a.m. In Part B, a hiker travels six kilometers south from nine-forty-five to ten-forty-five a.m. In Part C, a hiker travels four kilometers west from ten-forty-five to eleven-fifteen a.m. In Part D, a hiker travels six kilometers north from eleven-fifteen a.m. to twelve p.m.
You have this in Chemistry. It should be in physics, but never mind that.
A
d = 4 km due east. See note for part B.
t = 45 minutes = 3/4 hour
v = ??
d = v * t
4 = v * (3/4)
v = 4/(3/4) = 4 * 4/3 = 16/3 = 5 1/3
So his rate of travel is 5 1/3 km/hr due east. If you do not give the direction when it says velocity, you are wrong. Velocity has direction.
B
10 45 to 11 45 is 1 hour.
d = v * t
d = 6 km due south (this is actually a displacement which also has direction).
t = 1 hour
6 = v * (1)
6/(1) = v
6/(1) = v
v = 1 km/ hr due south
Planetesimal definition
A substance with a hardness of 8 will scratch a substance with a hardness of 7.
Answer:
- Hardness
Hardness is a mineral’s ability to resist being scratched. Minerals that are not easily scratched are hard. You test the hardness of a mineral by scratching its surface with a mineral of a known hardness. Mineralogists use the Mohs Hardness Scale, shown in Table below, as a reference for mineral hardness. The scale lists common minerals in order of their relative hardness. You can use the minerals in the scale to test the hardness of an unknown mineral.
Mohs Hardness Scale
As you can see, diamond is a 10 on the Mohs Hardness Scale. Diamond is the hardest mineral; no other mineral can scratch a diamond. Quartz is a 7. It can be scratched by topaz, corundum, and diamond. Quartz will scratch minerals that have a lower number on the scale. Fluorite is one. Suppose you had a piece of pure gold. You find that calcite scratches the gold. Gypsum does not. Gypsum has a hardness of 2 and calcite is a 3. That means the hardness of gold is between gypsum and calcite. So the hardness of gold is about 2.5 on the scale. A hardness of 2.5 means that gold is a relatively soft mineral. It is only about as hard as your fingernail.
Mohs Scale
Hardness Mineral
1 Talc
2 Gypsum
3 Calcite
4 Fluorite
5 Apatite
6 Orthoclase feldspar
7 Quartz
8 Topaz
9 Corundum
10 Diamond
sorry im so late -_-ll
If a light bulb is missing or Broken in a parallel circuit,will the other bulb light
you see a coin at the bottom of a fountain of water but when you reach for it it is in another place than it appears to be
How many unpaired electrons does niobium have
Final answer:
Niobium has five unpaired electrons, with one electron from the 5s orbital and four electrons from the 4d orbitals, following Hund's rule.
Explanation:
The student asked about the number of unpaired electrons in niobium. Niobium (Nb) has the atomic number 41, which means its electron configuration is [Kr]4d45s1. In the niobium atom, there are five electrons in its outermost d and s orbitals, out of which one can be found in the 5s orbital and four in the 4d orbitals. According to Hund's rule, which states that every orbital in a subshell is singly occupied before any orbital is doubly occupied and all electrons in singly occupied orbitals have the same spin, we can expect at least one unpaired electron in niobium due to its electron configuration.
To determine the exact number of unpaired electrons, we need to look more closely: the single electron in the 5s orbital is unpaired, and within the 4d subshell, which can hold up to 10 electrons, there are four electrons. These will occupy the first four orbitals singly before pairing up, resulting in four unpaired electrons from the 4d subshell. Therefore, niobium has a total of five unpaired electrons, one from the 5s orbital and four from the 4d orbitals.
How many atoms are in 5.03 moles of silicon dioxide
What has cells that are dried out?
The force produced by the pull of the earth's gravity on an object is called what?
yeah weight is the answer
Why is it not a good idea to use a stopper when combining two unknown substances in test?
Why do submarines have to be built with such strong, thick walls, compared to ships? Explain in as much detail as you can using ideas about water pressure.
If 1.98 moles of C are reacted with an excess of Cu2O how many moles of CO would be produced? moles
Using the balanced chemical equation 2C + Cu2O → 2CO + 2Cu, it can be determined that 1.98 moles of carbon will produce 1.98 moles of carbon monoxide (CO) when reacting with an excess of copper(I) oxide.
Explanation:The subject of this question is Chemistry, specifically dealing with stoichiometry which involves the calculation of the amounts of reactants and products in chemical reactions. Given that 1.98 moles of carbon (C) react with an excess of copper(I) oxide (Cu2O), we need to know the balanced chemical equation to find the amount of carbon monoxide (CO) produced.
The chemical equation for the reaction between carbon and copper(I) oxide to produce carbon monoxide and copper would be:
2C + Cu2O → 2CO + 2Cu
From this balanced equation, we can see that 2 moles of carbon react with 1 mole of copper(I) oxide to produce 2 moles of carbon monoxide. Therefore, if we start with 1.98 moles of carbon, we will also produce 1.98 moles of CO, since the ratio of carbon to carbon monoxide is 1:1.
When 1.98 moles of C are reacted with an excess of Cu2O, it would produce 1.98 moles of CO assuming the reaction follows the stoichiometry of 2 moles of C producing 2 moles of CO.
Explanation:If 1.98 moles of C are reacted with an excess of Cu2O, the number of moles of CO produced can be determined by using stoichiometry and the balanced chemical equation for the reaction. Unfortunately, the actual balanced chemical equation is not provided in the question. However, a typical reaction between carbon and copper (I) oxide might look like this:
2C(s) + Cu2O(s) → 2CO(g) + Cu(s)
According to this balanced equation, 2 moles of carbon react with 1 mole of copper(I) oxide to produce 2 moles of carbon monoxide. Therefore, if we have 1.98 moles of carbon, it would produce 1.98 moles of CO, assuming carbon is the limiting reactant and since there's an excess of Cu2O.
What unit of time on Earth is based on the rotation of the Earth? A. month B. day C. year D. hour
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Two hundred grams of a substance requires 0.52 kJ of heat to raise its temperature from 25°C to 45°C. Use the table to identify the substance. q = mC▲T. Mass (m) is in grams. Temperature is in degrees Celsius.
Substance: Specific Heat (C) in joules per gram/degrees centigrade:
Water (ice) 2.05
Iron 0.46
Aluminium 0.90
Gold 0.13
Copper 0.39
Ammonia (liquid) 4.70
Ethanol 2.44
Gasoline 2.22
Water (liquid) 4.18
Water (vapor) 2.08
Air (25 degrees Celsius) 1.01
Oxygen 0.92
Hydrogen 14.30
Question options:
water
gasoline
ammonia
gold
Answer:gold
Explanation:
is the equation 2C2H2+5O2=4CO2+2H20 A BALANCED EQUATION
Which of the following is a true statement about heat transfer through conduction, convection, or radiation? A. Heat ALWAYS flows from warmer objects to cooler objects. B. Heat is NOT related to temperature differences. C. Heat NEVER travels in a similar pattern. D. Heat ALWAYS flows from cooler objects to warmer objects.
Answer: Option (A) is the correct answer.
Explanation:
When we place two objects of different temperature adjacent to each other then there will occur transfer of heat from hotter object to colder object till their temperature becomes equal.
This process is known as conduction.
For example, a metal spoon placed in hot coffee cup then heat will flow from coffee to the cup.
Convection is defined as the process in which a fluid (liquid or gas) when heated then more dense (cooler) substance sinks ate the bottom whereas less dense (hotter) substance will rises at the top.
This intermixing of the substances tends to generate convection currents and this process is known as convection.
Radiation is defined as an electromagnetic energy which travels in space in the form of waves or particles.
This means that heat energy will always travel from a warmer object to a colder object.
Thus, we can conclude that heat ALWAYS flows from warmer objects to cooler objects, is a true statement about heat transfer through conduction, convection, or radiation.
The statement 'heat ALWAYS flows from warmer objects to cooler objects' is TRUE about heat transfer through conduction, convection, or radiation (Option A).
Heat transfer refers to the field that studies how heat is generated, converted, and exchanged between different physical objects.When two different materials that have different temperatures enter in contact, the heat is always transferred from the warmer to the cooler.This principle about heat transfer can also be applied when two objects/materials are mixed.In conclusion, the statement 'heat ALWAYS flows from warmer objects to cooler objects' is TRUE about heat transfer through conduction, convection, or radiation (Option A).
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Which of the following solution is more dilute and explain why?a)1M b)2M c)0.1M or d)0.009M
The correct answer is option D, 0.009M
Concentration is defined as the amount of solute in a solution.
Noting the following points about concentration is helpful;
The more the amount of solute present in a solution, the more concentrated the solution is. The lesser the amount of solute present in the solution, the lower the concentration of the solution.A high numerical value of concentration indicates that there is a higher amount of solute in the solution while a lower value of concentration indicates that there is a lesser amount of solute in the solution.
Hence, a solution with lesser concentration is said to be dilute. If the solution has a concentration of 0.009M, then it is a dilute solution.
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which two factors determine sound intensity
Factors that determine
sound intensity are amplitude and the distance.
Amplitude
Amplitude depends on the starting energy of the sound wave. If the amplitude is high
then the intensity will be high.
Distance
Distance is the measure of how far does the sound wave travel
from its source. If the distance is high then the intensity will be low.