What does criteria mean in science?
Answer:
a standard by which something may be judged.
Explanation:
Most americans overconsume? calcium. fiber. added sugars. potassium.
Most americans overconsume calcium. fiber. added sugars. potassium because in calcium, fiber added sugars, potassium has an healthy and nutrition food and it does't cause diseases.
Adequate intake of calcium is necessary for bone health as well as for basic biological functions such as nerve transmission, vasoconstriction, vasodilation, and muscle contraction. adequate potassium intakes are associated with optimal blood pressure and may reduce the risk of developing kidney stones and bone loss. fiber may protect against cardiovascular disease, obesity, and type 2 diabetes, and it is essential for digestive health. that's why most american's overtake this calcium, fiber added sugars, potassium
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10. Stephen is worried he has a fever. His dad is a scientist though, and only has a thermometer
that measures in Kelvin, and it measures Stephen's temperature to be 312 Kelvin. If Stephen's
temperature is above 100°F, he isn't allowed to go to school. Can Stephen go to school today?
What is the mass percent of an ammonium carbonate solution prepared by dissolving of solid into of water?
the mass percent is 45.67%
The mass percentage of a solution is calculated as the solute concentration in grams per 100 g of the solution.
Given that 39.5 g of water dissolves 33.2 g of ammonium carbonate.
∴
Mass of the solution is (33.2+39.5) g = 72.7 g
So, the solution of 72.7 g includes 33.2 g of ammonium carbonate.
So 100 g solution contains
33.2/72.7×100≈45.67 g ammonium carbonate
Thus the mass percentage of the solution is 45.67%
One approach to show the concentration of an element in a compound or component in a combination is as a mass percentage. The mass percentage is computed by dividing the total mass of the combination by the mass of each component and multiplying the result by 100%.
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Give an example of a pair of isotopes of the same element. Explain how they are similar and how they are different.
Please help, no bots!
An example of a pair of isotopes of the same element is Hydrogen and Deuterium. They are similar because they have same atomic number and they are different because they have different mass number.
What is Hydrogen ?Hydrogen is a chemical element with the atomic number 1. It is represented with symbol H. Mass number of hydrogen is 1. Hydrogen belong to group 1. It belongs to period 1. Hydrogen is s-block element.
What is Deuterium ?Deuterium is isotope of hydrogen. The atomic of deuterium is 1. The mass number of deuterium is 2. It is also known as heavy hydrogen. It is represented as D or 2H.
Thus from the above conclusion we can say that a pair of isotopes of the same element is Hydrogen and Deuterium.
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What is the percent yield of a reaction in which 61.7 g of tungsten(vi) oxide (wo3) reacts with excess hydrogen gas to produce metallic tungsten and 9.45 ml of water (d = 1.00 g/ml)?
The percent yield is 65.76 % .
The reaction mentioned in question is
[tex]WO_3 + 3H_2[/tex] → [tex]W + 3H_2O[/tex]
Molecular mass of 231.8 g
Percent yield is determined by calculating the mass of water that is formed by given mass of tungsten(VI) oxide
61.7g [tex]WO_3[/tex][tex]* 1mol WO_3/231.8g[/tex]
[tex]* 3mol of H_2O/ 1mol of WO_3 *18g/ 1mol of H_2O * 1ml/ 1g[/tex]
= 14.37 ml
Percent yield can be calculated by taking ratio of actual and theoretical yield of water formed = [tex]\frac{9.45}{14.37}[/tex] *100
Percent yield = 65.76 %
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What is the solution that is added to the cartridge of local anesthetic that can trigger bronchospasms?
Vasoconstrictor Preservative is the solution that is added to the cartridge of local anesthetic that can trigger bronchospasms.
Contraction of the muscles that line the airways (bronchi) in your lungs is referred to as bronchospasms. This causes difficulty in breathing. Chest tightness, Wheezing, Shortness of breath, Difficulty breathing are some of the symptoms of bronchospasms.
Vasoconstrictor Preservative is an additive which is used in local anesthetic. It enhance the duration and quality of the local anesthetic and also decreases surgical blood loss. Local anesthetics without a vasoconstrictor should be used in patients with sulfite allergy. Epinephrine, Levonordefrin, and Norepinephrine are some of the vasoconstrictors used with local anesthetic.
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Which elements on the periodic table are not reactive? Why?
Answer:
Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. They have eight valence electrons, which fill their outer energy level.
Explanation:
Answer:
Noble gases are nonreactive, nonmetallic elements in group 18 of the periodic table. Noble gases are the least reactive of all elements. That's because they have eight valence electrons, which fill their outer energy level.
Students in a class all make measurements and then calculate the density of the same metal block. During analysis, they find that their data are neither accurate nor precise. explain how several factors may have contributed to these problems.
The factors might include:
faulty measuring tool or instrumentrandom error by the studentsnot accounting for temperature changesWhat is Error in measurement?
Error in Measurement can be defined as difference in value between the actual value and the measured value.
There are some factors that might have contribute to the inaccuracy in the measurement of the metal block and they include :
faulty measuring tool or instrumentThe students may have have used a faulty instrument or an inaccurate instrument. The accuracy of the measurement will depend on the kind of scale they used. A kitchen scale, for example, is probably less accurate than a calibrated scale in a chemistry lab.
random error by the studentsRandom errors occurs when there might have been an error due to inability to read the accurate value of the instrument.
not accounting for temperature changesDensity varies with temperature and their might have been slight changes in temperature leading to inaccuracy in the readings.
In conclusion, errors can be mitigated by taking into account when we make a measurement by reporting an uncertainty value.
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An x-ray has a wavelength
of 2.2 x 10-11 m. What is
the frequency of the x-ray? Help asap please
Answer:
C
Explanation:
For electromagnetic waves frequency X wavelength = speed of light
f * 2.2 x 10^-11 = 3 x 10^8 m/s
f = 3 x 10^8 / 2.2 x 10^-11
= 1.36 x 10 ^19
= 1.4 x 10^19 with two significant digits
Answer: it's not C, it is A.
The melting point and the normal boiling point of water can be used to
calibrate thermometers. what are these respective temperatures in
kelvins?
1.) 32 and 212
2.) 0 and 373
3.) 0 and 100
4.) 100 and 273
5.) 273 and 373
The melting point and the normal boiling point of water in respective temperatures in kelvins are 273 and 373. The correct option is 5.
What is the boiling point?The boiling point is the point of water when the water vapor of the water is equal to the water vapor of the atmosphere.
The melting point is the point when a solid-state converts into liquid, and changes its physical state.
In Celsius, the boiling point is 100⁰C
In Kelvin, 273 + 100 = 373 K
The melting point is ice is 0⁰C
273 + 0 = 273 K
Thus, the correct option is 5. 273 and 373.
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As the elevator (lift) moves to the top of the ramp, the skier's potential energy _________ .
As the elevator (lift) moves to the top of the ramp, the skier's potential energy increasing .
What is potential energy?Potential energy is a form of stored energy that is dependent on the relationship between different system components. A spring has more potential energy when it is crushed or stretched.
A steel ball has far more potential energy raised above the ground than has after falling to Earth. In the raised position it is capable of doing more work.
Potential energy is a characteristic of systems rather than of particular bodies or particles; for instance, the system made up of Earth and the raised ball has more potential energy as they become further apart.
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The atomic number of oxygen is 8. What is the mass number of a oxygen atom with 7 neutrons?.
Answer: Mass number is 15
Explanation:
Mass number of an atom is the sum or total number of protons and neutrons present in the atom. It is represnted by the letter A
The Atomic number (Z) of an atom is defined as the number of protons in an atom and it is equal to the number of electrons present in the atom.
A= n + p
where n is the number of neutrons and p is the number of protons present in the atom
Z = p = e
Where p is the number of protons and e is the number of electrons present in the atom
Z for oxygen atom is 8
So, Z = p = 8 for oxygen atom
If n = 7
then A for oxygen atom with 7 neutrons is given by
A= n + p = 8+7 = 15.
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What does density measure? on flocabulary
A
how much liquid is in an object.
B
the amount of space an object takes up.
C
how tightly packed an object’s particles are.
D
the amount of matter contained in an object.
Hello!
Density measures... (c) how tightly packed an object's particles are.
Hope this helps!
A solution of cough syrup contains 5.00 ctive ingredient by volume. if the total volume of the bottle is 38.0 ml , how many milliliters of active ingredient are in the bottle?
In the bottle active ingredient are 1.9mL
The concentration in percent by volume can be expressed in the volume of the solute in mL per 100 mL of the solution. as such for a cough syrup with a concentration of 5.00 percent by volume, for every 100 mL of the solution, there are 5.00 mL of the active ingredient. from this the volume of the active ingredient in 38.0 mL of the cough syrup will be calculated as:
Volume of active ingredient = 38.0 mL × 5.00mL / 100mL = 1.9ml
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A block pf wood is 5 long, 4cm wide and 10cm high it weighs 100 grams calculate the density
Volume = 5x3x10 = 150 cm cubed
Mass = 150x100 = 15000 grams
Density = 15000/150 = 100g/cm cubed
ASAPPP MAKE SURE ITS NOT COPY N PASTE PLS
Ions are any molecules that have a charge. (positive or negative.) Group 1 atoms have 1 valence electron, so their ions are formed by giving away one electron. Group 7 atoms have 7 valence electrons, so their ions are formed by gaining one electron. This process gives the atom a full shell of 8, which makes it stabilized.
Is mercury, hg, an element, a compound, a homogeneous mixture, or a heterogeneous mixture?
Hg is a heterogeneous mixture, not a homogeneous mixture.
In chemistry, a mixture is a substance consisting of two or more different chemical substances that are not chemically combined. A mixture is two or more substances physically combined in which they retain their identity and are mixed in the form of solutions, suspensions, and colloids.
A mixture is formed when two or more different substances are physically combined and can be separated into their original substances. A chemical reaction occurs when two or more substances combine to form a new substance that cannot be converted back into the original substance.
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which of the following correctly describes an Arrhenius acid?
Answer:
D.
Explanation:
An Arrhenius acid is a compound that increases the H+ ion concentration in a water solution.
An object that is stationary is the result of what kind of force(s)?
no forces
unbalanced forces
net forces
balanced forces
It is a result of "balanced forces".
Hope this helps! Also, if you need help with the other questions regarding this assignment, feel free to check out the study set I made on Quizlet. Thanks and good luck!
Quizlet - "Unit 6: Lesson 2 Newton's First Law QC"
h t t p s : / / q u i z l e t. c o m / 7 3 7 7 5 9 5 5 5 / u n i t - 6 - l e s s o n - 2 - n e w t o n s - f i r s t - l a w - f l a s h - c a r d s / ? n e w
According to gravitational momentum, shown under that have balanced forces acting on them prefer to remain that way. According to Newton's first law balanced forces are affect an object that is stationary.
What is newtons first law ?Unless influenced by an imbalanced force, an item at rest stays at rest, and an object in motion keeps moving in a straight path at a constant pace.
An item that is stationary is one that is not shifting or considered the beginning. It is dormant. In such posture, all the forces exerting pressure on it are balanced out or their combined magnitudes are zero.
Based to their inertia, stationary objects which have already balanced forces acting on them prefer to stay that way. When an unbalanced force is operating on a stationary item will it move.
Thus, option D is correct.
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A 21.0 -cm -long cylindrical glass tube sealed at one end is filled with ethanol the mass of ethanol needed to fill the tube is found to be 44.23 g the density of ethanol is 0.789 g/ml calculate the inner diameter of the tube in centimeters
1.843 cm is the inner diameter of a 21.0 cm long cylindrical glass tube.
What is inner diameter of a cylinder?
Two times the wall thickness of the pipe is subtracted from the total exterior diameter to determine the inner diameter of the pipe. By removing the pipe's walls from the computation, just the internal diameter remains.
Lets volume of tube be V
V = 44.23/0.789
calculate by using conversion factor= 56.058 cm^3
Volume of cylinder = πr^2h
⇒ r^2= [tex]\frac{V}{\pi h}[/tex] ,
⇒ r = [tex]\sqrt{\frac{V}{\pi h}}[/tex]
⇒ r = [tex]\sqrt{\frac{56.058 }{\pi 21}}[/tex]
⇒ r = 0.9215 cm
And as we have radius, we can calculate diameter
d = 2r = 2 × 0.9215 cm = 1.843 cm
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An isotope of sodium (na) has a mass number of 22. how many neutrons does it have?
An isotope of sodium (Na) has a mass number of 22 it have 11 neutrons
Isotopes are members of a family of an element that all have the same number of protons but different numbers of neutrons. protons are the positively charged particles which are present in the nucleus of an atom. a neutron is a subatomic particle found in the nucleus of every atom except that of simple hydrogen. here sodium (Na) has a mass number of 22 so, in that sodium 11 proton are present and 11 neutron are present.
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if anyone sees this can they help out?
Examine the table for the densities of various substances above. If a student has an unknown substance with a mass of 51.3 g and a volume of 4.5 ml. A milliliter is equivalent to a cubic centimeter. Which statements can be supported by the information given here? Select ALL that apply.
A The substance is likely nickel.
B The substance is likely gold.
C The substance will float in water.
D The substance will sink in water.
E The substance is likely lead.
Answer:
The answers are is that they are likely lead and the substance will sink in water.
Explanation:
First of you have the formula Density=Mass/volume
I substituted 51.4 for mass and 4.5 for volume and divided it to get 11.4. According to the table Lead has 11.4 density. Then once you got that you redo the formula and the substance will most likely sink because it has more than 1 g/cm^3.
Hope this helps!
Also I did it on USA Test Prep c:
An ideal gas contained in 5.0 liter chamber at a temperature of 37°C. If
the gas exerts a pressure of 2.0 atm on the walls of the chamber, which of
the following expressions is equal to the number of moles of the gas?
a.
(2.0)(5.0)
(2.0) (310)
b. (2.0)(0.0821)
(5.0) (37)
c.
(2.0) (0.0821)
(5.0) (310)
d.
(0.0821) (37)
(0.0821)(5.0)
e.
(2.0)(5.0)
(0.0821) (310)
Answer:
earning
Explanation:
yeah its ok
HURRY
Give three examples of unbalanced forces in your everyday life.
Answer:
Tug of War
An object sinking in water
Kicking a ball
Answer:
turning a cartwheel.
riding a skateboard.
a football sailing toward the goalpost after it is kicked
The approximate diameter of the spherical nucleus of hydrogen-1 atom is 1 x 10-13 cm. estimate the density (g/cm3) of matter in a proton of mass of proton is 1.673 x10-24 g.
The density is 3.193 × 10^15 g/cm3.
Given;
Diameter = 1 x 10-13 cm
Mass = 1.673 x10-24 g
Volume = 4/3πr^3
Volume = 4/3 × 22/7 × (1 × 10^-13 / 2)^3
Volume = 11 × 10^-39 / 21
Density = Mass / Volume
= 1.673 x10-24 / 11 × 10^-39 / 21
Density = 3.193 × 10^15 g/cm3
What is density?
The amount of objects, including people, animals, plants, and other living things, that are present in a region is known as the density. The number of objects is divided by the area to determine density. The number of inhabitants in a nation divided by its size, measured in square kilometers or miles, is the population density of that nation.
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3. In a neutral atom, this element has an atomic mass of 23 AMU and has 11 protons.
What element is it
The element in question is Sodium
An atomic mass unit is defined as 1/12 th of the mass of carbon-12 atom.
The mass of an atom is mainly due to its protons and neutrons in the nucleus.
Weight of a proton is 1.6 x 10^-27 kg
Weight of a neutron is 1.6 x 10^-27kg
However weight of an electron is 9 x 10^-31kg and hence is negligible in calculation of amu
It is given that weight is 23 AMU and number of protons is 11
The protons in a nucleus also act as atomic number of the periodic table
Proton number 11 is the atomic number of Sodium
Hence the element is Sodium
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If two atoms have the same number of protons in their nucleus, you can conclude for sure that they ______. multiple choice question.
If two atoms have the same number of protons in their nucleus, and different no. of neutrons, then they're called isotopes.
What are isotopes?
The term "isotope" refers to an element's atoms that have the same number of protons but differing numbers of neutrons. Because they have the same number of proton, they remain the same element.
The amount of neutrons varies among different isotopes of a given element, resulting in variations in atomic mass. They also differ in the abundance of the surrounding environment.
Therefore, two atoms of the same element with the same number of protons and different number of neutrons are called isotopes.
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if 45.98 g of sodium combines with an excess of chloride gas to form 116.89 g of sodium chloride, what mass of chlorine gas is used in the reaction
The ionic compound sodium chloride, also referred to as salt, has the chemical formula NaCl, which denotes a 1:1 ratio of the ions sodium and chloride. The molar weights of 39.34 g Na and 60.66 g Cl in 100 g of NaCl are 22.99 and 35.45 g/mol, respectively.
If 45.98 g of sodium combines with an excess of chloride gas to form 116.89 g of sodium chloride, what mass of chlorine gas is used in the reaction?
116.89 g – 45.98 = 70.91 g of chlorine must have been used.
The characteristics of sodium and chlorine are as follows:
Water and sodium react violently.The gas chlorine is toxic.Soft and silvery-white sodium metal.Metals are corrosive to chlorine gas.The characteristics of the chemical sodium chloride are as follows:
in water dissolves.Non-poisonous.both crystalline and whiteIn light of this, it may be said that sodium chloride possesses wholly unique properties from those of sodium and chlorine.
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A lone pair must reside in which orbital type(s) to participate in resonance/conjugation/delocalization?
If a lone pair is participating in resonance, this capability the atom is both Sp2 or Sp hybridized. Looking at the Sp2 case, that ability there are 3 Sp2 orbitals and one P orbital. Assuming there is no formal cost on the atom, the three hybrid orbitals are used for bonding and the lone P-orbital holds the lone pair. Sp3 orbitals are no longer involved with resonance so the lone pair worried in resonance should never be in an Sp3 orbital.
A mathematically described area round a nucleus in an atom or molecule that may also include zero, one, or two electrons Electrons organize themselves in cloudlike areas round the nucleus referred to as orbitals.
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