Answer: white blood cells
Explanation: they protect you from illnesses and diseases
define uniform velocity, instantaneous velocity, uniform acceleration. show how, from the velocity time graph for a body
Answer:
The velocity at that particular instant is the instantaneous velocity. Uniform velocity is when the distance being covered is changing uniformly with time
Explanation:
I need help with this chemistry question.
If the percent by mass of carbon in sucrose is 42.2%, then how many grams of carbon are in a 30.0 g sample of sucrose?
_______________ g
Use the correct sigfigs in your answer or the computer will mark it incorrect
Answer:
12.66g
Explanation:
42.2% of 30.0g
=42.2/100 * 30.0
=0.422*30.0
12.66g
A pycnometer is a glass apparatus used for accurately determining the density of a liquid. When dry and empty, a certain pycnometer had a mass of 27.144 g. When filled with distilled water at 25.0°C, it weighed 36.377 g. When filled with chloroform (a liquid once used as an anesthetic before its toxic properties were known), the apparatus weighed 40.821 g. At 25.0°C, the density of water is 0.99704 g/mL
(a) What is the volume of the pycnometer?
The volume of pycnometer is 20.409 ml.
How is the volume of pycnometer determined?Volume of pycnometer is determined by using the general formula of density which is,
density=mass/volume
Considering the data given, mass of pycnometer =27.144 g
According to the standards , density of pycnometer at 25°C=1.33g/cm³
Substituting the values in the formula,
volume=mass /density=27.144/1.33=20.409 cm³
Pycnometer is an instrument which is used to measure the relative density of liquids and solids.The density of liquids is determined by using relative density and for solids the density is determined by weighing them.
It is based on Boyle's law which helps in determination of pressure-volume relationship. There are 2 types of this instrument ,one that which works on a basis of gas expansion and the other one which works on the basis of variable volume.
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Those 2 Question say...
1. Which substance is the most soluble at 100°C
and at most at 0°C
PLEASE HELP
Answer:
Water,
Explanation:
Water is one of the best liquids. It has an effect that called van der Waals forces lets geckos stick to stuff, and it's essential for life.
A 0.0755 m solution of nano₃ needs to be prepared through dilution. a 0.500 m stock solution will be added to a 1.000 l volumetric flask and then water will be added to the 1.000 l mark. determine the volume (in ml) of this 0.500 m stock solution of nano₃ needed to produce this solution.
The volume of 0.500 m stock solution of NaNO3 needed to produce 1.000 l of 0.0755 m solution of NaNO3 through dilution is 151 ml.
Dilution is defined as the process of decreasing the concentration of solute in a solution by adding more solvent. The relationship between the initial and final concentration and volume of a solution is represented by the equation below.
C1V1 = C2V2
where C1 = concentration of stock solution
V1 = volume of stock solution needed for the dilution
C2 = desired concentration of solution
V2 = desired volume of solution
Given:
C1 = 0.500 m
C2 = 0.0755 m
V2 = 1.000 l = 1000 ml
Use the equation to solve for the volume of stock solution needed for the dilution.
C1V1 = C2V2
(0.500 m) V1 = 0.0755 m(1000 ml)
V1 = 151 ml
volume of stock solution needed for the dilution = 151 ml
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Abbott's dad is experiencing heartburn, so he takes an antacid tablet to relieve his pain. He breaks up the tablet into smaller pieces before he adds it to a glass of water. Why does he do this?
Answer:
The first option is correct
Explanation:
A dietary supplement contains 5.00 x 10^3 iu per capsule. if the bottle recommends 2.00 capsules per day, how many iu per week are recommended?
7.00 x 10^4 IU/wk IU per week are recommended.
5000 IU/capsules x (2.00 capsules/1 day) x (7 days/1 week)
= 7.00 x 10^4 IU/wk.
What does IU in supplements mean?international scales
You may have noticed that the units of measurement on the labels of over-the-counter (OTC) fat-soluble vitamins (A, D, and E) have shifted from international units (IU) to metric units of measurement—micrograms (mcg) or milligrams (mg).The IU is an International Unit that is commonly used to measure fat-soluble vitamins such as Vitamins A, D, and E. Depending on the nutrient, the conversion of IU to mg varies. One milligrams of beta carotene is equivalent to 1667IU of Vitamin A activity. 15mg beta carotene equals 25,000IU vitamin A activity.1,000 IU does not equal 1,000 mg. As of now, no vitamin or mineral has a conversion factor of one. As a result, there is no way for these two values to equal one another.IU stands for International Unit and is a unit of measurement used in pharmacy and vitamin measurement. The precise definition of an IU varies depending on the substance, but in the case of this product, Vitamin E 1 IU is the biological equivalent of approximately 0.667mg.To learn more about IU in supplements refer to
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The titration of 25. 00 ml of 0. 2215 m hcl required 28. 84 ml of naoh for neutralization. What is the molarity of naoh?
The molarity of the NaOH solution is 0.192 M.
The reaction between HCl and NaOH looks like this:
[tex]HCl + NaOH[/tex]→[tex]NaCl + H_{2} O[/tex]
So NaOH and HCl react in a 1:1 ratio, which means that the amount of HCl is equal to the amount of NaOH. We can calculate the amount of HCl using its volume and molarity:
c = n/V, so n = c * V = 0.2215 M * 0.025 L = 0.0055375 mol of HCl and NaOH
So now we can calculate the molarity using the volume of NaOH:
c = n/V = 0.0055375 mol / 0.02884 L = 0.192 M
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4 a Write a word equation for the reaction of lithium with
water.
b The pH of the water changes. Why?
The word equation for the reaction of lithium with water is:
Lithium + Water → Lithium hydroxide + Hydrogen
The pH of water changes due to the solution being basic because of the dissolved hydroxide.
Due to its lower density than water, lithium floats on the surface while fizzing and emitting hydrogen gas. It gradually transforms into a colorless solution of lithium hydroxide and disintegrates.
In this reaction, 2 moles of Li react with 2 moles of water to form 2 moles of LiOH and 1 mole of hydrogen gas.
Therefore, the correct equation is
2Li + 2H₂O→ 2LiOH + H₂
As, before the pH of water is nearly neutral but with the formation of lithium hydroxide which is a strong base the pH changes to basic.
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If you add a chunk of zinc to a beaker of acid and zinc shavings to another beaker of acid, the sample with the zinc shavings will react faster. What property causes the increase in rate?.
Answer: surface area
Explanation:
The smaller the surface area the faster the rate of reaction. The zinc shavings have a smaller surface area of reactants compared to the large piece of zinc. The smaller surfaces area of reactants ensures that it comes into close proximity with the acid solution for reaction to take place.
help asap!! will give brainlist!!! 25 Points!!
The solution can still take an additional 30 grams of KCl before the solution becomes saturated.
What is solubility?The term solubility refers to the fact that a substance is able to dissolve in water. In fact we define the solubility of a substance as the amount of a substance that is able to dissolve in a given amount of a solvent.
Thus the solution is made when the solute is dissolved in a solvent. The solubility curve shows the impact of temperature on the solubility of a substance. For some substances, the solubility may even be increased as temperature increases and for some substances, the solubility is decreased as the temperature increases.
If we study the solubility curves, we can see that the solubility of KCl at 80 degrees Celsius is 50g/100gH2O. This implies that if we dissolve about 20 grams of the solid KCl in 100g of water at 80 degrees, the solution can still take an additional 30 grams of KCl before the solution becomes saturated.
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Describe what the whole number is called that comes before a compound and what its purpose is.
The whole number that comes before a compound is called a coefficient and it is used to balance the compound in a chemical equation.
What is a chemical compound?Chemical compounds is defined as those substances which are made up of two or more elements that are chemically combined together.
The combination of two compounds that reacts are called the reactants while the compounds that are formed are called the products.
The reaction that leads to the formation of products needs to be balanced using whole numbers in front of the chemical compounds.
For example,
[tex]H_{2}[/tex] +[tex]O_{2}[/tex] --->[tex]H_{2} O[/tex]
To balance the above equation, the whole number 2 is inserted infront of hydrogen and the water molecule that is formed. That is,
[tex]2H_{2} +O_{2} --- > 2H_{2} O[/tex]
Therefore, the whole number that comes before a compound is called a coefficient and it is used to balance the compound in a chemical equation.
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When a substance reacts chemically to create a new substance, will that new substance have the same physical and chemical properties as the initial substance? Explain your answer.
When a substance reacts chemically to form a new substance, that new substance will have different physical and chemical properties from the starting substance.
When a chemical change occurs, atoms in substances are recombined to form a new substance. This recombination of atoms creates new substances.
The new substances have a different composition than the composition of the first one.
Since the chemical and physical properties of a substance depend on how atoms are combined in a substance when this combination of atoms changes, the physical and chemical properties of the new substance also vary from those of the starting substance.
Therefore, when a substance reacts chemically to create a new substance, that new substance will have different physical and chemical properties from that of the initial one.
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step 3 of this protocol describes using a minimal amount of boiling solvent to dissolve your impure solid. why is it important to use only a minimal amount of solvent?
Using a minimum amount of solvent is important because it minimizes the amount of material lost by retention.
Why must only a small amount of the required solvent be used for recrystallization?
In order to support the objective of recovering the greatest possible amount of crystals, the amount of solvent used during crystallization is typically kept to a minimum.
Since heat can push some solids over the edge and completely dissolve them, crystallization occurs most frequently in solids with moderate solubility at low temperatures. Accordingly, in practice, a certain amount of the compound will dissolve in the mother liquor at low temperatures. Depending on the solubility profile of the compound, this amount may be significant. Utilizing the least amount of hot solvent possible reduces the amount of compound lost to the mother liquor.
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12. which property of a mixture could be used to tell the difference between a
container of salt water and a container of distilled water?
a. a mixture is not uniform.
b. a mixture contains more than one identifiable particle.
c. a mixture looks different than the pure substances from which it is made.
d. a mixture has different melting and boiling points than the pure substances
from which it is made.
Option (d) a mixture has different melting and boiling points than the pure substances from which it is made.
This property of a mixture can be used to tell the difference between a container of salt water and a container of distilled water as the two given mixtures are homogeneous mixture as they have a uniform composition throughout the substance.
The properties of the mixture i.e. the melting point and boiling point of a mixture vary depending on the particles present in it.The particles of the pure substances in a homogeneous mixture can't get separated due to their small size.The resultant of mixing two pure substances giving a new product without inseparable pure substance is termed as Solution.Therefore the given two mixtures are solution and hence they have different melting and boiling points than the pure substances from which they are made of.
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Study the chemical reaction.
This formula shows a reaction between iron and oxygen.
What should the values of x and y be in order to balance
this reaction?
Answer:
B
Explanation:
left side has 3 Fe and 4 oxygen
Scientists have been concerned about a set of industrial chemicals called cfc's (chlorofluorocarbons) because they:____.
Scientists have been concerned about a set of industrial chemicals called CFCs (chlorofluorocarbons) because they are harmful to the environment by altering the ozone layer that covers the atmosphere.
What is the ozone layer?The ozone layer is a very tiny layer present in the atmosphere that contains O3 molecules, which serve to absorb the radiation of UV rays, and this layer can be damaged by CFCs.
In conclusion, scientists have been concerned about a set of industrial chemicals called CFCs (chlorofluorocarbons) because they are harmful to the environment by altering the ozone layer that covers the atmosphere.
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Need help very fast on this hard question
A sample of baking soda contains 34.48 g of sodium, 1.51 g of hydrogen, 18.02 g of carbon, and 72.00 g of oxygen.
a. What is the total mass of the sample? ______________g
Remember the addition rule for sigfigs
b. What is the percent by mass of each element in baking soda? Remember the sigfig rule for division
Sodium ______________%
Hydrogen ______________%
Carbon ______________%
Oxygen ______________%
Follow sigfig rules for division; answers will be marked incorrect by the computer if you do not use the correct sigfigs in your final answer
Answer:
The total mass is "126.01"
The sodium is "0.2736"
The hydrogen is "1.20"
The carbon is "14.30"
The oxygen is "57.14"
- From my chemistry teacher, we did this in class
Which statement best describes a scatterplot?
A. it shows data as a percentage of a whole
B. it shows data points connected by a single line
C. it shows quantitative data that relate two variables
D. it shows qualitative data grouped by similarities
The statement that best describes a scatterplot is as follows: it shows quantitative data that relate two variables (option C).
What is a scatterplot?A scatter plot is a type of plot or mathematical diagram using Cartesian coordinates to display values for typically two variables for a set of data.
The scatter plot graph is plotted on a cartesian plane made up of two axis namely X-axis and Y-axis.
The X-axis is axis on a graph that is usually drawn left to right and usually shows the range of values of an independent variable.
On the other hand, the y-axis is the axis on a graph that is usually drawn from bottom to top and usually shows the range of values of variable dependent on one other variable.
Therefore, it can be said that the scatter plot shows quantitative data that relate two variables.
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Sodium phosphate reacts with sulfuric acid to form sodium sulfate and phosphoric acid. What is the stoichiometric coefficient for sulfuric acid when the chemical equation is balanced using the lowest whole-number stoichiometric coefficients?.
When sodium phosphate reacts with sulfuric acid, forming sodium sulfate and phosphoric acid, the stoichiometric coefficient for sulfuric acid in the balanced chemical equation is 3.
In every balanced chemical equation, the total number of individual atoms on the reactant side must be equal to the total number of individual atoms on the product side. The stoichiometric coefficient is the number written in front of each reactants and products that tells how many moles of each are needed in the reaction.
The chemical equation for the given reaction is:
[tex]Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]Na_{2} SO_{4}[/tex] + [tex]H_{3} PO_{4}[/tex]
Put the necessary stoichiometric coefficient to balance each element.
Balancing Na:
[tex]2Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]H_{3} PO_{4}[/tex]
Balancing P:
[tex]2Na_{3} PO_{4}[/tex] + [tex]H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
Balancing S:
[tex]2Na_{3} PO_{4}[/tex] + [tex]3H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
Notice that H and O are already balanced.
Hence, the balanced chemical equation for the reaction is:
[tex]2Na_{3} PO_{4}[/tex] + [tex]3H_{2} SO_{4}[/tex] = [tex]3Na_{2} SO_{4}[/tex] + [tex]2H_{3} PO_{4}[/tex]
where 3 is the stoichiometric coefficient of sulfuric acid, [tex]H_{2} SO_{4}[/tex].
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a liquid solvent is added to a flask containing an insoluble solid. the total volume of the solid and liquid together is 80.0 ml. the liquid solvent has a mass of 33.4 g and a density of 0.865 g/ml. determine the mass of the solid given its density is 2.25 g/ml.
A liquid solvent is added to a flask containing an insoluble solid, the total volume of the solid and liquid together is 80.0 ml and the mass of the solid is determined as 79.35g
What is density?Density, in simple terms is defined as the substance's mass per unit of volume. The symbol that is most commonly used in case of density is [tex]\rho[/tex] but is also commonly stated as D.
Its formula is Density = Mass/ Volume
Vol of liquid = mass/Density
= 33.4 g x 1 ml/0.865 g = 44.73 ml of liquid
Vol of solid = 80.0 ml - 44.73ml of liquid
=35.27 ml of liquid
Thus, the mass of solid = vol of solid x 2.25 g/ml
= 35.27 x 2.25
=79.35 g
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Arena is investigating a separation technique using the following apparatus. salt solution and/or sugar solution. a) 2 beakers b) tripod stand and wire gauze c) glass rod i) name the separation technique she may be possibly investigating. ii)do you think she has missed out a very important apparatus? if yes, identify and state the importance of the apparatus.
Arena might be investigating a separation technique known as evaporation, but she is missing a burner to perform it properly.
i) Evaporation is a separation technique that can be used to separate a substance dissolved in a liquid. It is usually applicable when the solvent doesn't have a too high boiling point and the solute is not prone to degradation at increased temperature.
ii) However, as the method requires heating the solution in order to accelerate the evaporation of the solvent, and while the tripod stand and wire gauze are used to mount the beaker with the solvent, they are useless without a burner that is used to introduce heat.
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How many valence electrons does the ground-state electron configuration of nitrogen have?.
Nitrogen has a total of five valence electrons in its ground state.
Nitrogen is a nonmetal and a gas that belongs to the periodic table's p-block elements. It is located in the second period and 15th group of the periodic table.
It has a mass number of 14 and an atomic number of 7. It has the following electrical configuration: 1s²2s²2p³.
Now, according to the following statement: The atomic number of an element is always equal to the number of electrons present in that element's atom. And the electrons in an atom's outermost valence shell are known as valence electrons.
Hence, the electronic configuration of the nitrogen atom reveals that the number of electrons present in the outermost shell, i.e., the second shell, is 5 electrons.
Thus, nitrogen has a total of five valence electrons in its ground state.
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If you were to do a 50% serial dilution, starting with a 10% concentration, how many dilutions would you have to make before getting to 2. 5% as your final concentration?.
Dilution Factor : It indicate what quantity of volume is there in your solution in comparison to the original solution. It is also known by the name of dilution ratio. The answer would be the 2% of the solution needed before having the final concentrations of the solution to the 50% of serial dilution with the initial concentration.
Now,
Here , 50 % serial dilution,
Initial concentration = 10 %
Final concentrations =2.5 %
v1*c1 = v2*c2
v2 = v1*c1/ c2
Starting concentration of solution = 10%
Final concentration of solution = 50 %
If we have to make 50% serial dilution to reach the final concentration of 2.5 % then first serial dilution will give 5% concentration and second dilution will give 2.5% concentration. Thus required times of serial dilution is 2%
In conclusion 2% dilution we have to make before having final concentration.
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A quasi-equilibrium process is a process during which a system never remains in equilibrium at all times.
a. true
b. false
A 10. g cube of copper at a temperature T1 is placed in an insulated cup containing 10. g of water at a temperature T2 . If T1 > T2, which of the following is true of the system when it has attained thermal equilibrium? (The specific heat of copper is 0.385 J/(g·°C) and the specific heat of water is 4.18 J/(g·°C).)
A) The temperature of the copper changed more than the temperature of the water.
B) The temperature of the water changed more than the temperature of the copper.
C) The temperature of the water and the copper changed by the same amount.
D)The relative temperature changes of the copper and the water cannot be determined without knowing T1 and T2 .
The temperature of the copper changed more than the temperature of the water when it attend thermal equilibrium. Thus option A is correct.
What are thermal equilibrium?Thermal equilibrium is defined as the condition under which two substance are in physical contact with each other but there is no exchange of heat energy between both of them.
As we are only considering the isolated system so the heat of the system must be constant this implies that the loss of heat of cube is equal to the gain of heat of water. Thus it started flow from hot body to cold body until it reach thermal equilibrium.
Thus, the temperature of the copper changed more than the temperature of the water when it attend thermal equilibrium. Thus option A is correct.
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maryann and josh left a cup of ocean water in the sun. When they returned a day later only salt was left in the cup. Which best explains what happened to the ocean water and n the cup?
If Maryann and josh left a cup of ocean water in the sun, when they return a day later and observe only salt in the cup, it could mean that the water has evaporated.
What is evaporation?Evaporation is a type of vaporization that occurs on the surface of a liquid as it changes into the gas phase. Evaporation can also be defined as the process in which a liquid or solid is converted into vapour.
Factors affecting evaporation include the following;
The following factors affect the rate of evaporation of a liquid;
TemperatureWind speedSurface areaHumidityWhen a liquid is exposed to large surface area, the rate at which it evaporates will increase.
Thus, if Maryann and josh left a cup of ocean water in the sun, when they return a day later and observe only salt in the cup, it could mean that the water has evaporated.
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Three students are given a 200g object to weigh on a balance and record the following masses: 150g, 151g, 150g. What can be said about the accuracy and precision of the balance?
The accuracy and precision of the balance are 50%, 51%, and 50%.
What is the percent error?Percent error is the calculation of the difference between the actual result and the estimated result.
Given that the following masses are calculated by three students are 150g, 151g, 150g
The weight of an object is 200g
The percent error will be
actual value - estimated value / estimated value x 100
1. 150 - 200 / 200 x 100 = 50
2. 151 - 200 / 200 x 100 = 51
3. 150 - 200 / 200 x 100 = 50
Thus, the accuracy and precision of the balance is 50%, 51%, and 50%.
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highlight all the atoms of the four functional groups by clicking on them. when you click on each atom, it will change color. to deselect an atom, click on it again. do not highlight any bonds.
H-S
PO4
O-H
NH2
A functional group is a group of atoms bonded together in a specific way that can replace a hydrogen atom in a hydrocarbon. The molecule shown here contains four functional groups (−OH−OH, −SH−SH, −NH2−NH2, and −OPO2−3−OPO32−) attached to a carbon chain that is six carbon atoms long.
In chemistry, what are the four functional groups?Alkanes, alkenes, alkynes, and arenes are the four distinct hydrocarbon functional groups.A functional group is a collection of atoms or bonds that define the function of the hydrocarbon to which they are attached. Alcohol, aldehyde, ketone, carboxylic acid, halogens, and double and triple covalent bonds are some examples.A functional group is a group of atoms in a molecule that have distinct chemical properties independent of the molecule's other atoms. Covalent bonds connect the atoms in a functional group to each other and to the rest of the molecule. Phosphate: The addition and release of phosphate groups to and from ADP and ATP is how cells store and expend chemical energy.
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Which are radioactive isotopes of oxygen?
(hint: add protons until the name changes to oxygen. then, add neutrons until the
isotope is radioactive.)
select one:
a.0-17 and 0-18
b. 0-13 and 0-19
c.0-14 and 0-16
d.o -16 and 0-19
O-13 and O-14 are the radioactive isotopes of oxygen among the given options.
Isotopes are the variations of differences in the atoms which are classified as belonging to the same element. An element is determined by the proton numbers in nucleus, therefore all isotopes of same element will have same protons number and different neutrons number.
Radioactive isotopes are also called as radioisotope. These are the forms of elements which are unstable and emits the radiations so that they can be transformed into a form which is more stable.
O-15 or Oxygen-15 is also a radioisotope which is used in the positron emission tomography (PET). Oxygen has several radioactive isotopes, each used for different purpose in different fields. O-14 is radiogenic, it is produced by the decay of the other atoms. O-14 is also a positron emitter
O-13 and O-14 undergoes the electron capture for their nuclear decays and they have short half lives of about 100 seconds.
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