whats between -999 and 1000
how many electrons are present if a bromine ion has a charge of -1
In a beaker, sugar is dissolved in water, and then the water is heated and evaporates. The sugar is recovered, and heat is again applied. Vapor is released, and the material in the beaker changes from white to black. What must you know to determine if a chemical change occurred?
A) the boiling point of water
B) the boiling point of sugar
C) the identity of the black substance
D) temperature at which sugar evaporates
The boiling point of sugar is a must to determine if a chemical change has occurred or not. Thus, the correct option is B.
What is Chemical change?A chemical change is the change which occurs when one substance combines with the other substance in solution. For examples while heating the sugar, it reacts with the oxygen gas present in the environment.
If we dissolve sugar in a glass of water, we can evaporate the water to get back to the solid sugar in the vessel. This is a physical change called a phase transition. A phase change involves a change in the state or form of the new substance formed.
Sugar does not boil, but instead will get re-crystallized in the beaker at a much higher temperature of about 320°F. As the temperature keeps on increasing, the water in the beaker will reach its boiling point, and turn into steam in the process of evaporation. Meanwhile, the sugar in the solution will begin to re-crystallize in the bottom of the vessel.
Therefore, the correct option is B.
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which two elements in the periodic table have the same number of electrons in their outer orbitals?
Which conclusion is best supported by Julie’s observations?
A. The liquid is a pure substance because it is colorless.
B. The liquid is a mixture because its temperature rises.
C. The liquid is a pure substance because it remains liquid when cold.
D. The liquid is a mixture because it has a gas dissolved in a liquid.
A student weighs out 0.477 g of KHP (molar mass = 204.22 g/mol) and titrates to the equivalence point with 36.78 mL of a stock NaOH solution. What is the concentration of the stock NaOH solution? KHP is an acid with one acidic proton.
The molarity of NaOH solution is [tex]\boxed{{\text{0}}{\text{.0635 M}}}[/tex]
Further Explanation:
The concentration is the proportion of substance in the mixture. The most commonly used concentration terms are as follows:
1. Molarity (M)
2. Molality (m)
3. Mole fraction (X)
4. Parts per million (ppm)
5. Mass percent ((w/w) %)
6. Volume percent ((v/v) %)
Molarity is a concentration term that is defined as the number of moles of solute dissolved in one litre of the solution. It is denoted by M, and its unit is mol/L.
The formula to calculate the molarity of NaOH solution is as follows:
[tex]{\text{Molarity of NaOH solution}}=\frac{{{\text{amount}}\;\left({{\text{mol}}} \right)\;{\text{of}}\;{\text{NaOH}}}}{{\;{\text{volume }}\left({\text{L}}\right)\;{\text{of}}\;{\text{NaOH solution}}}}[/tex] ...... (1)
Firstly the volume is to be converted into L. The conversion factor for this is,
[tex]{\text{1 mL} ={\text{1}}{{\text{0}}^{{\text{-3}}}}{\text{ L}}[/tex]
So the volume of NaOH solution can be calculated as follows:
[tex]\begin{aligned}{\text{Volume of NaOH solution}}&=\left({{\text{36}}{\text{.78 mL}}}\right)\left({\frac{{{\text{1}}{{\text{0}}^{-3}}{\text{ L}}}}{{{\text{1 mL}}}}}\right)\\&=0.03678\;{\text{L}}\\\end{aligned}[/tex]
The number of moles of KHP can be calculated as follows:
[tex]{\text{Moles of KHP}} = \frac{{{\text{Given mass of KHP}}}}{{{\text{Molar mass of KHP}}}}[/tex] …… (2)
The given mass of KHP is 0.477 g.
The molar mass of KHP is 204.22 g/mol.
Substitute these values in equation (2).
[tex]\begin{aligned}{\text{Moles of KHP}}&=\left({{\text{0}}{\text{.477 g}}}\right)\left({\frac{{{\text{1 mol}}}}{{{\text{204}}{\text{.22 g}}}}}\right)\\&={\text{0}}{\text{.0023357 mol}}\\\end{aligned}[/tex]
Since KHP is a monoprotic acid and NaOH is also monobasic. Therefore equal moles of KHP and that of NaOH will react and thus become equal. The moles of NaOH is 0.0023357 mol.
The moles of NaOH are 0.0023357 mol.
The volume of NaOH solution is 0.03678 L.
Substitute these values in equation (1).
[tex]\begin{aligned}{\text{Molarity of NaOH solution}}&=\frac{{{\text{0}}{\text{.0023357 mol}}}}{{{\text{0}}{\text{.03678 L}}}}\\&={\text{0}}{\text{.063504 M}}\\&\approx {\text{0}}{\text{.0635 M}}\\\end{aligned}[/tex]
So the molarity of NaOH solution is 0.0635 M.
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Answer details:
Grade: Senior School
Subject: Chemistry
Chapter: Concentration terms
Keywords: molarity, NaOH, KHP, monoprotic, amount of NaOH, molarity of NaOH solution, 0.003678 L, 36.78 mL, 0.0635 M, molarity of NaOH solution, 0.477 g and 204.22 g/mol.
The concentration of the stock NaOH solution is 0.0635 mol/L.
Given:
Molar mass of KHP = 204.22 g/mol
Mass of KHP used = 0.477 g
Number of moles of KHP = mass / molar mass
= 0.477 g / 204.22 g/mol
= 0.002336 mol
Since KHP is an acid with one acidic proton, it reacts with one mole of NaOH in a 1:1 ratio.
Therefore, the number of moles of NaOH used in the titration is also 0.002336 mol.
The volume of NaOH solution used = 36.78 mL
= 0.03678 L
The concentration of NaOH solution = number of moles/volume in liters
= 0.002336 mol / 0.03678 L
= 0.0635 mol/L
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What are the similarities and differences between heat and thermal energy? Need to know for quiz tomorrow:( PLEASE HELP!!!
Final answer:
Heat is the transfer of thermal energy between objects, while thermal energy is the total kinetic energy of all particles in an object. Heat causes a change in temperature, while thermal energy affects the overall temperature of an object.
Explanation:
Differences between Heat and Thermal Energy:
1. Definition: Heat is the transfer of thermal energy from an object at a higher temperature to an object at a lower temperature. Thermal energy is the total kinetic energy of all the particles in an object.
2. Transfer: Heat can be transferred between objects, while thermal energy remains within an object.
3. Temperature Change: Heat transfer causes a change in temperature, while thermal energy affects the overall temperature of an object.
Similarities between Heat and Thermal Energy:
1. Units: Both heat and thermal energy are measured in Joules.
2. Related: Heat is a form of thermal energy and both are related to the movement of particles.
3. Conservation: Both heat and thermal energy obey the law of conservation of energy.
Give 20 points and brainliest, please answer quickly!!!
The idea that sedimentary rocks are deposited in horizontal layers unless disturbed by forces within the Earth can best be explained by which of Steno's principles?
A. principle of superposition
B. principle of horizontality
C. principle of original lateral continuity
D. principle of faunal succession
(It didn't have science so I chose chemistry as the subject :/)
The idea that sedimentary rocks are deposited in horizontal layers unless disturbed by forces within the Earth can best be explained by the principle of horizontality. Thus, the correct option for this question is B.
What do you mean by Steno's principle of horizontality?Steno's principle of horizontality may be defined as the process through which the succeeding layers of sediment and sedimentary rocks are significantly accumulated in an identical fashion in order to help geologists to understand different layers.
According to the context of this question, Steno's principles of horizontality determine the actual existence of sedimentary rocks with respect to time. Apart from this, it is also known as the law of original horizontality. It also describes the complete process of patterns in which rock layers are deposited.
Therefore, the principle of horizontality is explained by the idea that sedimentary rocks are deposited in horizontal layers unless disturbed by forces within the Earth.
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magnesium chloride is an example of an ionic compound, which is a compound composed of what?
According to the United Nations, how many people lack access to safe drinking water?
A mole is equal to 6.02 x 10²³, just like a dozen is equal to 12. So if you have a mole of carbon atoms, you have 6.02 x 10²³ carbon atoms. Likewise, if you have a dozen carbon atoms, you have 12 carbon atoms. The atomic mass on the periodic table is also known as the MOLAR MASS. The molar mass is the mass of 1 mole of the element. Therefore, 1 mole of carbon has a mass 12.01g/mole. How many atoms are in 5.2 grams of carbon? Please show your work. (This is a unit conversion problem.)
You want to investigate how the color of light affects the growth of plants. The best resource for reliable scientific information to help you with your hypothesis would be a(n)
A. book on the species of plants grown in your area
B.magazine article on gardening
C.article documenting experiments with their results
D.website containing information about light sources
Answer: C.article documenting experiments with their results
Explanation:
An independent variable is the variable that can be changed or manipulated so as to determine the result of such change on the dependent or the experimental variable.
In the given study, the color of light is the independent variable the effect of which is to be determined over the plant growth which is the dependent variable.
The information related to this experiment can be observed on the article documenting the experiments similar experiment. This will have valid and reliable information.
Which of the following elements is very reactive and needs to lose one electron to have a full outermost shell?
Scandium
Cesium
Iodine
Xenon
Answer:
Cesium
It is the most reactive element on the periodic table.
Which of the following is an example of velocity? Question 15 options: A plane travelling south towards the Bahamas. A man running 7 miles per hour west. A car sitting at a stop sign? A dog running at 5 miles per hour.
Answer is: A man running 7 miles per hour west.
Velocity is equivalent to a specification of its speed and direction of motion, for example 100 km/h to the east.
Velocity is a physical vector quantity (measured in metres per second) and need magnitude and direction to define it, for example 100 metres per second east.
Answer: A man running 7 miles per hour west.
Explanation: Vector quantity is a quantity which has both magnitude and direction.
Scalar quantity is a quantity which has only magnitude.
Velocity is a vector quantity which expresses the speed of the body along with the direction in which it is moving.
[tex]v=\frac{distance}{time}=\frac{miles}{hour}[/tex]
Thus the correct option is A man running 7 miles per hour west.
Baking soda is mixed with water, and no bubbles are produced. When baking soda is mixed with vinegar, it bubbles and foams rapidly.
What chemical property of baking soda is shown in the scenario?
flammability
reactivity
boiling point
color change
Answer:
reactivity
Explanation:
Which mineral property can be determined simply by observation
Answer is: luster.
Luster is example of qualitative observations.
Qualitative observations are information about the quality of substances.
In qualitative observation, informations are collected using senses (sight, hearing, taste, smell and touch).
Qualitative observations are not measurable and cannot be recorded in terms of numbers.
Luster is the way light interacts with the surface of a mineral.
Other example is cleavage, the tendency of mineral to split along definite crystallographic structural planes.
Light that bounces off a surface is said to be
A. reflected
B. refracted
C. absorbed
D. radiated
explain the process that forms a normal fault ad leads to an earthquake along the fault. Describe the fault, the type of stress that produces it, and events during the earthquake
Answer:
the plates move which causes an earthquake.
Explanation:
i learned about this.
Answer:
i have no clue
Explanation:
In an experiment using a calorimeter, the following data were obtained: what is the total number of joules absorbed by the water?
A.) 1,000
B.) 1,500
C.) 6,300
D.) 4,500
the term Reuther Ford gave to the positively charged particles in the nucleus of an antom was
Which factor impacts the possible number of ways in which different atoms can be put together?
true or false: the part of photosynthesis that does not require light is the Calvin cycle
3. Give three examples of how microorganisms might demonstrate the characteristics of life
PLease help me i will give brianlist i am siooo desperte please
Answer:
they grow, reproduce and die.
Explanation:
Microorganisms are a way of life that cannot be visualized without the aid of a microscope. These tiny beings can be found in the air, on the ground, and even in man. These tiny beings are not all the same, they can be very different in size and way of life. However, they all have in common a very simple structure and the impossibility of being seen without the use of a microscope. In addition, microorganisms can represent some characteristics of life, since as well as living beings in gereal they grow, reproduce and die.
What provides clues about how igneous rocks were formed? A color B Texture C Luster D Streaks
What are chicken nuggets made of
Gretchen wants to run a test to discover whether glass, copper, wood, or plastic conduct electricity. She sets up a circuit connecting a battery to a light bulb, with a small gap she will use to test the conductivity of the different substances. One at a time, she connects the circuit with the chosen test material, and records whether or not the light bulb comes on. The variables in this experiment are
The plastic, wood, copper, and glass are the variables. The variables in an experiment are the things we can change and then test.
what is the name of the compound that has the formula Li2SO3?
a. lithium sulfite
b. lithium sulfate
c. bilithium trisulfate
d. bilithium trisulfide
The name of the compound that has the formula Li₂SO₃ is lithium sulfite, it is an ionic compound, hence option A is correct.
Although lithium sulfate doesn't often increase in solubility with temperature like other salts do, it is soluble in water. Instead, because its dissolution is an exothermic process, its solubility in water declines as temperature rises.
It is simple to hydrolyze and absorb water vapor from the air, which releases gaseous hydrogen sulphide, which is extremely hazardous.
Lithium sulfite easily to dissolve in water, ethanol, acid, and base; difficult to dissolve in alkali.
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Which of these are examples of complex patterns of inheritance? Options:
1. light exposure affecting wing color in birds
2. a trait, such as height, being determined by at least four genes
3. a single gene mutation affecting a person’s speech, body strength, and weight
4. three alleles that can determined wing color
5. all of the above
Complex patterns of inheritance include traits affected by environmental factors, polygenic inheritance where traits are controlled by multiple genes, single gene mutations impacting multiple traits, and the presence of multiple alleles for a single trait.
Explanation:The examples of complex patterns of inheritance include:
Light exposure affecting wing color in birds.Polygenic inheritance, such as height being determined by at least four genes.A single gene mutation affecting a person’s speech, body strength, and weight.Three alleles that can determine wing color.All of the above.Polygenic inheritance refers to a trait that is controlled by more than one gene. In humans, traits like skin color, height, and weight are examples of polygenic characteristics. This type of inheritance can result in many possible phenotypes. Additionally, the phenomenon of multiple alleles exists when more than two alleles are present in a population, such as the ABO blood type alleles (IA, IB, and i).
Overall, complex inheritance patterns involve the interaction of multiple genes, the presence of multiple alleles within a population, and can also be influenced by environmental aspects.
In your own words, what is homeostasis?
Answer:
homeostasis is the stabilizing of an organism's internal condition
The carbohydrates seen here contains 3 common elements.They are....
A) carbon,hydrogen,and oxygen
B) oxygen,nitrogen,and sulfur
C) hydrogen,oxygen,and nitrogen
D)carbon dioxide, hydrogen,and phosphorus