Answer:
3.25 M
Explanation:
Number of moles = mass/ molar mass
mass of NaOH = 65 g
Molar mass of NaOH = 40 g/mol
Number of moles of NaOH = 65g/40 g/mol = 1.625 moles
Let us recall that;
n = CV
n = number of moles of solute
C = concentration of solution
V = volume of solution
C = n/V
n = 1.625 moles
V = 500/1000 L = 0.5 L
C = 1.625 moles/0.5
C = 3.25 M
what are the factors that affect the rate of chemical reaction?
Answer:
surface area of a solid reactant.
concentration or pressure of a reactant.
temperature.
nature of the reactants.
presence/absence of a catalyst.
In the word, thermohaline, thermo means _________ and haline means_____________
Answer:
Thermo means heat/related to heat and haline means salty/of salt
If the volume of a gas is 1020 ml at 120°C and 1160 torr, what will the volume be at 20°C and 700 torr?
Answer:
1260 mL
Explanation:
Use formula (P1V1)/T1 = (P2V2)/T2
convert C to K
120 +273 = 393 K
20 + 273 = 293 K
plug numbers in
((1160)(1020))/ 393 = ((V2)(700))/ 293
solve for V2
V2 = 1260.187 mL
Explain why NH3 has a higher solubility in water than SbHz.
Answer: NH3 has a higher solubility rate than SbH3 because it has much stronger bonds. ... HoCH2CH2OH because it can form two bonds with water compared to the other molecule which can only form one.
HOPE THIS HELPS
Why are large crystals of sodium chloride used instead of small
crystals when making ice cream
Answer:
Sodium chloride is added to the ice to lower the freezing point of the ice. Large crystals dissolve more slowly than small crystals. This allows time for the ice cream to freeze more evenly.
Explanation:
Which three of the following are the laws that Mendel discovered?
Law of Heredity
The Law of Segregation
The Law of Dominance
Law of Gravity
The Law of Independent Assortment
Answer:
genetics i.e the law of heredity
Answer:Mendel proposed three laws: Law of Dominance. The Law of Segregation. Law of independent assortment.
Explanation:Gregor Johann Mendel was a scientist who is recognized as the Father and Founder of genetics. Mendel conducted many experiments on the pea plant (Pisum sativum) between 1856 and 1863. He studied the results of the experiments and deducted many observations. Thus, laws of inheritance or Mendel’s laws of inheritance came into existence. Before learning about Mendel’s laws of inheritance, it is important to understand what the experiments performed by Mendel were.
which reacts faster, rock salt or grains of salt? Why?
Answer:
salt
Explanation:
because it has a much larger volume ratio
Two hydrogen atoms covalently bond to form a hydrogen molecule.
What is true about the hydrogen molecule?
A-The hydrogen molecule can have more or less energy than the hydrogen atoms.
B-The hydrogen molecule has less energy than the two atoms.
C-The hydrogen molecule has the same energy as the two atoms.
Answer:
B
Explanation:
the energy of two separate hydrogen atoms decreases as they approach each other, and the single electrons on each atom are shared to form a covalent bond.
If you have a cup of water at 35 degrees Celsius, and a bath tub of water at 35 degrees Celsius which will melt the most ice and why?
I NEED THIS ASAP
A truck was carrying a substance in a tank. The molecules of that substance were moving away from each other. The truck parked overnight in a place where energy transferred out of the substance. In the morning, the substance was a gas. How were the molecules moving in the morning? Explain why the molecules were moving that way after energy was transferred out of them.
Answer:
1. In the morning the molecules were moving away from each other with a smaller speed than when the truck was carrying the substance.
2. The reason is that the molecules contain less average kinetic energy, thus their average speed is lower.
Explanation:
Our model of the state (phases) of the substances describes the molecules of solids as not moving away from each other, they are relatively fixed with respect to each other, just vibrating; the molecules of liquids as free to slide pass each other, which permits they to flow, but not moving away from each other; and the the molecules of the gases as moving away from each other, which is the cause of them occupying the whole space of the container that holds them.
According to that, the substance that the truck was carryng was a gas, because the molecules were moving away from each other.
After parking overnight, where energy transferred out of the substance, in the morning, the substance was a gas. Hence, the molecules were moving away from each other too. This answer the first question.
Since energy was transferred out of the substance, in the morning the temperature of the substance decreased (but no enough to make it a liquid). The average kinetic energy of the gases depends only on the temperature. So, the average kinetic energy of the molecules in the morning was smaller than when the truck was carrying the substance. Since the kinetic energy is proportional to the square of the speed of the molecules, the smaller average kinetic energy means that the average speed of the molecules was smaller too. Hence, in the morning the molecules were moving away from each other with a lower speed than when the truck was carrying the substance.
Average kinetic energy is the average sum of all kinetic energy of all the molecules of gases. Therefore, molecules will move at a lesser speed as average kinetic energy will become small.
What is kinetic energy?It is a energy which is possess by a moving object. It is very difficult to find the correct value of kinetic energy so we find average kinetic energy. Which is very easy to calculate as compared to calculating kinetic energy. It is not dependent on the type of gases or mass of gases.
Mathematically, the formula for kinetic energy can be given as
K.E=1/2mv²
Where,
m= mass of object
v= velocity of object
Molecules will move at a lesser speed as average kinetic energy will become small.
Therefore, molecules will move at a lesser speed as average kinetic energy will become small.
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pls help me answer this!
Answer:
neutrons is metal.......
A gas occupies 10.2 L at 0.986 atm. What is the pressure if the volume increases to 16.0 L?
Answer:
0.629 atm
Explanation:
P1V1 = P2V2
P1 = 0.986 atm
V1 = 10.2 L
P2 = ?
V2 = 16.0 L
Solve for P2 --> P2 = P1V1/V2
P2 = (0.986 atm)(10.2 L) / (16.0 L) = 0.629 atm
You place air in a sealed can at standard temperature and pressure (STP). You double its absolute temperature (K) while leaving the
volume constant.
What happens to the pressure?
It doubles.
It decreases by one-half.
It increases to four times the original pressure.
It stays the same.
Answer:
Pressure will double
Explanation:
Gay - Lussac Law => P ∝ T with volume and mass held constant.
=> P₁/T₁ = P₂/T₂ => P₂ = P₁T₂/T₁
T₂ = 2T₁
P₂ = P₁(2T₁)/T₁ = 2P₁
Double absolute temperature => double pressure
This gland of the endocrine and digestive systems produces insulin to help control the body's sugar levels and enzymes which aid in digestion.
Answer:
Pancreas.
Explanation:
Living systems are self-organized life forms and are known to be very much interactive with their surroundings or environment. Also, living systems are dependent on the flow of information, matter and energy at various levels.
Some examples of living systems in organisms are respiratory system, nervous system, digestive system, and circulatory system.
Additionally, living systems comprises of the following components; cells, organs, muscle, tissues, blood, etc.
An endocrine system refers to a series of ductless glands and organs responsible for the production and secretion of hormones that are used by the body for the performance of various functions such as metabolism, controlling growth, reproduction, mood, sleep, etc. These hormones are secreted directly into the circulatory system (blood) and then transported to the organs and tissues in the body.
Pancreas is one of the glands of the endocrine and digestive systems that produces insulin to help control the body's sugar levels and enzymes which aid in digestion.
46 POINTS!!! help me with chemistry, please!
Water Sugar Lemon Juice Lemonade Percent Yield Leftover Ingredients
946.36g 196.86g 193.37g 719.84g 95% Water and Sugar
4. Try to reduce the amount of leftover ingredients by changing the amount of one, two, or all three starting ingredients. Show your stoichiometric calculations below.
5. During factory inspection, Just Lemons, Inc. discovered that a water valve to the lemonade mixing station was not functioning. Once they repair it, more water will enter the mixing station. From what you know about the limiting and excess ingredients for current lemonade production, what advice would you give engineers about the upcoming increase in water?
Answer:
are you sure it is 95%?????
Explanation:
How is a molecule and compound similar? How are they different from each other?
Answer:
A molecule is a group of two or more atoms held together by chemical bonds. A compound is a substance which is formed by two or more different types of elements which are united chemically in a fixed proportion. All molecules are not compounds. All compounds are molecules.
Explanation:
Please help me ........
how do particles of salt and dust affect cloud formation?
Answer:
Cloud formation: Insoluble dust particles can form cloud droplets that affect global and regional climate. Scientists have long recognized the importance of soluble particles, such as sea salt and sulfates, in creating the droplets that form clouds and lead to precipitation.
Rubidium Rb
when was the element discovered and by whom ??? ASAP MAKE IT AT LEAST A PARAGRAPH!!!
Answer:
Rubidium Rb was discovered in 1861It was discovered by the German chemist Robert Wilhelm Bunsen and the German physicist Gustav-Robert KirchoffExplanation:
Rubidium was discovered by the German chemists Robert Bunsen and Gustav Kirchhoff in 1861 while analyzing samples of the mineral lepidolite with a device called a spectroscope. The sample produced a set of deep red spectral lines they had never seen before. Bunsen was eventually able to isolate samples of rubidium metal. Today, most rubidium is obtained as a byproduct of refining lithium.
What determines crystal size in minerals formed by lava or magma?
Answer:
When magma cools, crystals form because the solution is super-saturated with respect to some minerals. If the magma cools quickly, the crystals do not have much time to form, so they are very small. If the magma cools slowly, then the crystals have enough time to grow and become large.
Explanation:
How many grams of 02 will be consumed?
23.36 g 02
11.68 g 02
1.Si dos átomos tienen el mismo "Z" pero diferente "A" se trata de : a) Nucleones b) Isótopos c) Mesones
Answer:
Si dos átomos tienen el mismo "Z" pero diferente "A" se trata de Isótopos.
Explanation:
Cada elemento químico se caracteriza por el número de protones de su núcleo, que se denomina número atómico Z. Pero en el núcleo de cada elemento también es posible encontrar neutrones, cuyo número puede variar. La masa atómica (A) se obtiene sumando el número de protones y de neutrones de un núcleo determinado.
Un mismo elemento químico puede estar constituido por átomos diferentes, es decir, sus números atómicos son iguales, pero el número másico es distinto. Estos átomos se denominan isótopos del elemento. Si a un átomo se le añade un neutrón, se convierte en un isótopo de ese elemento químico. En otras palabras, se denomina isótopos a los átomos de un mismo elemento, cuyos núcleos tienen una cantidad diferente de neutrones.
Los isótopos de un elemento tienen las mismas propiedades químicas, pero difieren algo en sus propiedades físicas.
Entonces, si dos átomos tienen el mismo "Z" pero diferente "A" se trata de Isótopos.
Drag and drop the labels provided into the boxes below to explain how the Earth-Sun-Moon system results in these seasons on Earth.
How many oxygen molecules are in a flask that contains 1.43 grams of oxygen?
Answer:
0.08937835168818843
Explanation:
1 grams Oxygen is equal to 0.062502343837894 mole.
counting atoms worksheet answer key i need help!!
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By combining the stoichiometry through the subscript provided for each element, the atoms may be counted.
What is atom?Atom, the smallest unit of matter that may be separated without releasing electrically charged particles. It is also the lowest unit of matter with the characteristics of a chemical substance. As a result, the atom is indeed the fundamental building component of chemistry.
The majority of the atom comprises empty space. The rest of the structure is made up of a positive-charged nucleus of neutrons and proton surrounding by such a cloud of negative-charged electrons.
H[tex]_2[/tex]O 2 Hydrogen atom 1 oxygen atom
O[tex]_2[/tex] 2 oxygen atom
NaCl 1 sodium atom 1 chlorine atom
Therefore, by combining the stoichiometry through the subscript provided for each element, the atoms may be counted.
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Which part of an atom has most of its mass?
А. electrons
B.neutrons
c.nucleus
D.protons
Answer:
B
Explanation:
Exothermic reactions have _____ net bond energy.
A) positive
B) negative
C) neutral
GIVING BRAINLIEST
What do the arrows at point 3 indicate?
O Cool air is above water.
O Warm air is above land.
O Warm air is cooling quickly.
O Cool air is warming quickly.
Answer:
D) Cool air is warming quickly.
Explanation:
d is the answer.
The arrows at point 3 indicates that Warm air is cooling quickly and the correct option is option C.
What is Sea Breeze?Sea breeze is a blowing breeze from sea towards land during the day is called sea breeze.
During the day, the land surface heats up faster than the water surface.
Therefore, the air above the land is warmer than the air above the ocean.
As a result, warm air rises. Therefore, the warmer air over the land surface is rising.
As the warm air over the land is rising, the cooler air over the ocean is flowing over the land surface to replace the rising warm air
Therefore, The arrows at point 3 indicates that Warm air is cooling quickly and the correct option is option C.
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!!!PLEASE HELP!!!!
What is the molarity of a solution with 0.5 moles of potassium fluoride dissolved to make 50 mL of solution?
A.0.1 mol/L
B.10 mol/L
C.1.72 mol/L
D.1450 mol/L
Answer: B
Explanation: molarity = concentration c= n/V = 0.5 mol/ 0.05 l = 10 mol/l
The molarity of a solution is the number of moles of its solute divided by volume in liters. The molarity of the 50 ml solution containing 0.5 moles of potassium fluoride is 10 M or 10 molar.
What is molarity ?Molarity is a common term used to express the concentration of a solution. It is the ratio of number of moles of solute particles to the volume of solution in liters. Hence, its unit is mol/L or molar.
The molarity of a solution is a colligative quantity as well as temperature dependent.
Given,
no.of moles of potassium fluoride salt in water = 0.5 moles.
volume of solution = 50 ml
1 L = 1000 ml
then 50 ml = 0.05 L.
Molarity = no.of moles of solute/ volume of solution in L
M = 0.5 moles/ 0.05 L
= 10 M.
Therefore, the molarity of the given solution is 10 molar.
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For the reaction represented by the equation:
Cl2 + 2KBr → Br2 + 2KCl
how many grams of KCl can be produced from 356 grams KBr?
Answer:
223 g KCl
General Formulas and Concepts:
Atomic Structure
Reading a Periodic TableMolesStoichiometry
Using Dimensional AnalysisAnalyzing reactions RxNExplanation:
Step 1: Define
[RxN - Balanced] Cl₂ + 2KBr → Br₂ + 2KCl
[Given] 356 gg KBr
[Solve] g KCl
Step 2: Identify Conversions
[RxN] 2 mol KBr → 2 mol KCl
[PT] Molar Mass of K - 39.10 g/mol
[PT] Molar Mass of Br - 79.90 g/mol
[PT] Molar Mass of Cl - 35.45 g/mol
Molar Mass of KBr - 39.10 + 79.90 = 119 g/mol
Molar Mass of KCl - 39.10 + 35.45 = 74.55 g/mol
Step 3: Stoichiometry
[DA] Set up conversion: [tex]\displaystyle 356 \ g \ KBr(\frac{1 \ mol \ KBr}{119 \ g \ KBr})(\frac{2 \ mol \ KCl}{2 \ mol \ KBr})(\frac{74.55 \ g \ KCl}{1 \ mol \ KCl})[/tex][DA] Divide/Multiply [Cancel out units]: [tex]\displaystyle 223.024 \ g \ KCl[/tex]Step 4: Check
Follow sig fig rules and round. We are given 3 sig figs.
223.024 g KCl ≈ 223 g KCl