The wrong Juan did in this investigation is he multiplied by 4 and did not count it for 60 seconds to calculate the heart rate per minute.
What to do to know the pulse rate or heart beat and what did Juan did wrong?See to know the heart beat or pulse rate we simply do it for 60 seconds because we generally obtain the data for a minute .Here Juan is investigating the heart rate for 15 seconds .Plus the the cardinal mistake he did was he multiplied the beats by 4 of both the classmate knowing a student just rushed into the classroom and is exercised.So obviously the student who just arrived the classroom would have high heart rates comparatively.Calculating both heart rates and multiplying with 4 is the main mistake Juan is commiting.To know more about heart rate visit:
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How many moles of co2 are found in a 168.2 gram sample
Answer:
Number of moles = 3.82 mol
Explanation:
Given data:
Number of moles of CO₂ = ?
Mass of CO₂ = 168.2 g
Solution:
Number of moles = mass/molar mass
Molar mass of CO₂ = 44 g/mol
By putting values,
Number of moles = 168.2 g/ 44 g/mol
Number of moles = 3.82 mol
What is pentene?
A.) An Alkane
B.) An Alkene
C.) An Alkyne
D.) A Polymer
Answer:
B. an alkene
Explanation:
pentene has 5 carbons and 10 hydrogen atoms and one double bond
the melting point of scandium fluoride is 1552°c, explain why scandium fluoride has a high melting point.
Answer:
Scandium(III) fluoride, ScF3, is an ionic compound. It is slightly soluble in water but dissolves in the presence of excess fluoride to form the ScF63− anion.
hope it will help you......
A high melting point is caused by a high fusion heat, a low fusion entropy, or a blend of the two. The crystal phase of highly symmetrical molecules is densely packed with many efficient intermolecular interactions, resulting in a higher enthalpy change on melting.
What is intermolecular force?An intermolecular force is a force that mediates the interaction of molecules, including electromagnetic forces of attraction or repulsion that act between atoms and other types of neighboring particles, such as atoms or ions.
The intermolecular forces can be in order of strength, ion-dipole, hydrogen bonding, dipole-dipole, and Van der Waals forces.
Because it is the power of attraction or repulsion between atoms or molecules rather than the ability to share or give/take electrons.
ScF3, or Scandium(III) fluoride, is an ionic compound. It is only slightly soluble in water, but in excess fluoride it dissolves to form the ScF63 anion.
Thus, due to the strong intermolecular forces, it have high melting point.
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As a reaction proceeds, does the instantaneous reaction rate increase or decrease?.
The correct answer for this question is Decreases.
How quickly or slowly a reaction proceeds is known as the rate of reaction or speed of reaction for a reactant or product. As the reaction progresses, the rate of reaction slows because the initial concentration of the reactants is high, but as time goes on, this concentration falls, making the reaction slower. As a result, the rate of reaction is dependent on concentration and diminishes over time.
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rank the following element in increasing order for the atomic radius ne , na , p , al
Answer:
oxygen, carbon, aluminum, potassium
Which has the longest bond length for the Cl-O bond?
1. ClO4-
2. ClO3-
3. ClO2-
4. ClO-
Answer:
4 ClO-
Explanation:
Bond length ∝ 1/ Bond order
Bond order of ClO − =1,
Bond order of ClO 2− =1.5,
Bond order of ClO 3− =1.66 ,
Bond order of ClO 4− =1.75.
Thus the order of bond length is
ClO 4− <ClO3− <ClO2−
<ClO −
______________- the layers of soil. More mature (older) soils have more of these layers
fill in the blank please
I am not sure why your teacher isn't asking for the layers, but here is the list of layers;
A -(topsoil) Mostly minerals from parent material with organic matter incorporated. A good material for plants and other organisms to live.
E - (eluviated) - Leached of clay, minerals, and organic matter, leaving a concentration of sand and silt particles of quartz or other resistant materials – missing in some soils but often found in older soils and forest soils.
B - (subsoil) Rich in minerals that leached (moved down) from the A or E horizons and accumulated here.
C - (parent material) The deposit at Earth’s surface from which the soil developed.
R - (bedrock) A mass of rock such as granite, basalt, quartzite, limestone or sandstone that forms the parent material for some soils – if the bedrock is close enough to the surface to weather. This is not soil and is located under the C horizon.
animal cells do not have a cell wall. why is this advantage for these eukaryotes ?
chemistry 10th grade PLEASE really need these answers :(
A.In a chemical reactions, substances after the arrow are called ________.
C2H4 + O2 → CO2 + H2O
1 products
2 reactants
3 no answer text provided
4 chemicals
B.In this reaction: sodium + water -> sodium hydroxide + hydrogen gas
which substances are the reactants?
1 hydrogen gas
2 sodium hydroxide + hydrogen gas
3 sodium + water
4 sodium hydroxide
C. This is an example of what type of reaction?
Mg + Fe2O3 → Fe + 3 MgO
1 decomposition
2 double replacement
3 single replacement
4 synthesis
5 combustion
D. This is an example of what type of reaction?
Ca(OH)2 + Al2(SO4)3 → CaSO4 + Al(OH)3
1 synthesis
2 decomposition
3 double replacement
4 combustion
5 single replacement
E. This is an example of what type of reaction? PbSO4->PbSO3 + O2
1 single replacement
2 combustion
3 double replacement
4 synthesis
5 decomposition
F. This is an example of what type of reaction?
C2H4 + O2 → CO2 + H2O
1 single replacement
2 double replacement
3 synthesis
4 decomposition
5 combustion
Answer:
I hope this helped you.
Explanation:
A: 1
B: 3
C: 3
D: 3
E: 5
F: 5
Which statement best explains why protons are used
to identify an element?
Answer:
Every atom of an element will have the same number of protons
Explanation:
Protons are used to identify an element because every atom of an element will have the same number of protons.
Protons are the positively charged particles found in an atom. They are called the atomic numberEvery atom of an element has the same number of protons. An element can have different atom in form of isotopes. These isotopes are only identifiable by the number of protons they have.[I'd really appreciate if I could get some help with this. ]
Complete the table below by indicating what kind of interaction (attract or repel) will be evident when particles of different or like-charges interact?
Like charges repel while the unlike charges attract.
What is electrostatics?Electrostatics has to do with the interaction that does occur between charges. We know that a charge is a specie that has an imbalance in the number of electrons that it contains. The substance is positively charged if it contains less electrons and more protons. The substance is negatively charged if it contains more electrons and less of protons.
In either case, the interaction that exist between particles could be an attractive one or a repulsive one. It is regarded as the first law of electrostatics that like charges repel while the unlike charges attract.
Hence when we look at the table, a negative charge would repel another negative charge, a positive charge would repel another positive charge but a positive or a negative charge would attract a charge of opposite sign. The interaction that is possible between the charges is given by Coulombs law.
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Help please. Will give brailiest
Answer:
i dont have a answer im just answering so you can give the person who answered brailiest :)
Explanation:
How does altitude affect the freezing, melting, and boiling points of water?
Answer:
At higher altitudes, air pressure is lower. When atmospheric pressure is lower, such as at a higher altitude, it takes less energy to bring water to the boiling point. Less energy means less heat, which means water will boil at a lower temperature at a higher altitude.
In an ordinary container (exposed to atmospheric pressure). The freezing point will increase with altitude (and corresponding decrease in atmospheric pressure), but the difference is very slight.
Explanation:
When at a higher altitude , the atmospheric pressure is usually low and it
requires lesser amount of energy for the water to reach its boiling point. This
means that at higher altitudes , water boils at a lower temperature.
The freezing point of water increases with a higher altitude. This means that
water freezes at a higher temperature although the difference is very small.
The low pressure present in higher altitudes increases the melting point of
water(ice)
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You find a ring with a mass of 89.2g. You fill a graduated cylinder up with 10mL of water
and put the ring into the cylinder. The water mark rises up to the 20mL mark. What is
the ring made of
Solids
Table of Densities
Density g/cm
Solids
2.56
Copper
264
Gold
Density g/cm
8.92
Marble
19.32
Diamond
3.52
Platinum
21.4
O Marble
O Quartz
Copper
Gold
Answer:
Ring is made up off copper.
Explanation:
Given data:
Mass of ring = 89.2 g
Volume of water = 10 mL
Volume of water + ring = 20 mL
Ring is made up of = ?
Solution:
Volume of ring = (Volume of water + ring) - Volume of water
Volume of ring = 20 mL - 10 mL
Volume of ring = 10 mL
Density:
Density = mass/volume ( 1 mL = 1 cm³)
d = 89.2 g/ 10cm³
d = 8.92 g/cm³
Thus, ring is made up off copper.
Define covalent bond.
Which substance is a pure substance? Cereal Silver Jelly bean Shampoo
Answer: Silver
Explanation:
Answer:
SILVERRRRRRRRRRR
Explanation:
is energy transfered from reactants to products or products and reactants.
Answer: Energy is transferred from reactants to products .
Explanation: Energy is used to break bonds in reactants, and energy is released when new bonds form in products. Reactants are your starting point, and products are your result.
A sample of silver metal contains 1.91 X 1021 atoms. How many moles of silver is
this?
Answer:
1.91×1021/6.023×10^23
Explanation:
need thanks and make me brainiest if it helps you
Which force helps food move through the large intestine during digestion?
A Muscle contractions exert a pushing force on the food.
B Oxygen molecules exert a pulling force on the food.
C Gravity exerts an upward pushing force on the food.
D Water exerts an upward pushing force on the food.
Answer:
The answer is A
Explanation:
Pls put me as brainliest
The force helps food move through the large intestine during digestion is muscle contractions exert a pushing force on the food. Thus option A is correct.
What is force?Force is defined as a push or pull upon any object resulting from the object's interaction with another object. It is a vector quantity.
Force can also be defined as an external cause that, when applied, changes or tends to change the state of the body, if the body is in motion.
Force is expressed as
Force = mass x acceleration
There are five types of force
Gravitational forceElectric forceMagnetic forceNuclear forceFrictional forceDigestion is define as the breakdown of food into smaller component that can be absorbed into blood streams.
Thus, the force helps food move through the large intestine during digestion is muscle contractions exert a pushing force on the food. Thus option A is correct.
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How many moles are in 98.3 grams of NaF?
Answer:
1 mole is equal to 6.022x10²³
Answer:
2.979 mol
Explanation:
mass of NaF=14+19
=33g
33g of NaF is the mass of 1 mol
98.3g of NaF is the mass of (98.3/33)*1=2.979 mol
What type of representative particle does KClO3 have?
atoms
formula units
molecules
Answer:
formula units
Explanation:
[tex]$KClO_3$[/tex] is potassium chlorate. It is an ionic compound containing potassium, chlorine and oxygen. The ion in potassium chlorate are held together by the ionic bonds in the lattice structure.
A representative particle may be defined as the smallest unit for which the substance exists in its natural form. For most of the elements, atom is the representative particle. Molecule is the representative particle for diatoms and molecular compounds. But for ionic compounds such as [tex]$KClO_3$[/tex] , NaCl, etc. . the representative particle is its formula units.
using your balanced equation from q20, determine how many ml of 0.25 m koh is needed to neutralize 10 ml of 0.5 m h3po4
60 mL volume of 0.25M KOH was needed to neutralize 10 mL of 0.50 M H3PO4.
The balanced reaction for the reaction of KOH and H3PO4 is shown below.
3KOH + H3PO4 → K3PO4 + 3H2O
mol of H3PO4 = (0.50 M) * (10 mL) * (1 L/1000 mL) = 5x10-3 mol
The number of moles of KOH needed to neutralize H3PO4 will depend on their stoichiometric ratio.
moles KOH = mol H3PO4 * (3 mol KOH / 1 mol H3PO4)
moles KOH = 5x10-3 mol * (3 mol KOH / 1 mol H3PO4)
moles KOH = 1.5X10-2 mol
mol of KOH = (concentration KOH)(volume KOH)
volume KOH = mol KOH / concentration KOH
volume KOH = 1.5 x 10 -2 mol / 0.25 M
volume KOH = 0.06 L or 60 mL
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*
How many molecules are in 12.5 g of NaCl?
Answer: 0.7 moles
Explanation:
an empty beaker weighs 34.49 g. when completely filled with water, the beaker and its contents have a total mass of 299.25 g. what volume does the beaker hold? use ????
An empty beaker weighs 34.49 g. when completely filled with water, the beaker and its contents have a total mass of 299.25 g. Volume does the beaker hold 264.76 mL.
Equation :mass of water = total mass - mass of beaker
mass of water = 299.25 g - 34.49 g
mass of water = 264.76 g
density of water = mass / volume
volume = mass / density
V = 264.76 g / 1.00g/mL
V = 264.76 mL
What is mass ?A physical body's overall composition is measured by its mass. This term also measures inertia, or the body's resistance to acceleration when a net force is applied. The strength of an object's gravitational pull to other bodies is also influenced by its mass. The kilogram serves as the SI's fundamental mass unit.
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Explain with 3 points why the element Ra is bigger than the element Be.
Answer:
1. it has more valence shells
2. its position in the periodic table is lower than Be
3. its bigger in atomic mass
Explanation:
=)
If you were going 50 mph how fast are you traveling in meters per second?
Answer: Um pretty sure it is 22.35 m/s
1). Take your current speed in either kmph or mph.
2). Divide it by 60 to get kilometers per minute or miles per minute.
3). Divide by 60 again, getting kilometers per second or miles per second.
And der you go.
F the distance separating the objects is the same for each pair, which pair of objects will have the greatest gravitational force between them? a 50-kg object and an 80-kg object a 65-kg object and a 65-kg object a 65-kg object and a 75-kg object a 60-kg object and a 70-kg object
Answer:
A 65-kg object and an 75-kg object.
Explanation:
The gravitational force is given by :
[tex]F=G\dfrac{m_1m_2}{r^2}[/tex]
F is directly proportional to the product of masses and inversely to the distance between them.
In this problem, the distance separating the objects is same for each pair. We need to find the greatest gravitational force between them.
(1) a 50-kg object and an 80-kg object
[tex]F_1=G\dfrac{4000}{r^2}\ N[/tex]
(2) a 65-kg object and an 65-kg object
[tex]F_2=G\dfrac{4225}{r^2}\ N[/tex]
(3) a 65-kg object and an 75-kg object
[tex]F_3=G\dfrac{4875}{r^2}\ N[/tex]
(4) a 60-kg object and an 70-kg object
[tex]F_4=G\dfrac{4200}{r^2}\ N[/tex]
From the above calculations we find that if the product of masses is maximum, it lead to maximum gravitational force between objects. Hence, a 65-kg object and an 75-kg object will have maximum gravitational force between them.
what is the name of the covalent compound N5Cl8
Answer:
Did you put that in right because i've never heard of a compound called that nor is there a compound called that on the internet
Explanation:
You must of put that in wrong
WILL MARK BRAINLIEST!!
Use complete sentences to differentiate between acids and bases on the basis of their behavior when dissolved in water. Give an example of each type.
Please be simple and original....DONT PLAGIARIZE PLEASE!! 50 points!
Answer:
acids and bases cancel each other out. acids increase H+ ions while bases release H+ ions
Explanation:
31. (03.03 MC)
Which of the following best represents and explains the formula for a compound made from fluorine and hydrogen? (5 points)
O HF, because both fluorine and hydrogen are capable of forming only one lonic bond.
O HF, because both fluorine and hydrogen are capable of forming only one covalent bond.
O H,F, because fluorine is short of two electrons, and hydrogen is short of one electron.
OH,F, because fluorine is capable of forming one, and hydrogen is capable of forming two covalent bonds.
Answer:c
Explanation: