Answer:
All of your body systems have to work together to keep you healthy. Your bones and muscles work together to support and move your body. Your respiratory system takes in oxygen from the air
Explanation:
Calculate the mass of 1.35 moles of sodium chloride
Answer:
78.894g of NaCl
Explanation:
This requires some dimensional analysis:
Using the molar mass of NaCl we get the answer we are looking for.
1.35 Moles of NaOH * [tex]\frac{58.44g NaCl}{ 1 mole NaCl}[/tex] = 78.894 g of NaCl
Write the symbol of each neutral element based on its written electron configuration:
Answer:
Nd.
Explanation:
Counting the electrons we get 60.
So it is the element with atomic number 60.
Neodymium Nd.
Quantitative was to measure light intensity
Calculate the volume (in cm³) of 38.5 grams of platinum if the density of platinum is 21.5 g/cm³. Give your answer to 2 decimal places
Answer:
[tex]\boxed {\boxed {\sf v\approx 1.79 \ cm^3}}[/tex]
Explanation:
The formula of density is:
[tex]d=\frac{m}{v}[/tex]
If the formula is rearranged for volume, it becomes:
[tex]v=\frac{m}{d}[/tex]
The mass of the platinum is 38.5 grams.
The density is 21.5 grams per cubic centimeter.
[tex]m=38.5 \ g \\d= 21.5 \ g/cm^3[/tex]
Substitute the values into the formula.
[tex]v=\frac{38.5 \ g}{ 21.5 \ g/cm^3}[/tex]
Divide. Note that the grams (g) will cancel each other out.
[tex]v=1.79069767 \ cm^3[/tex]
Round to 2 decimal places (hundredth place). The 0 in the thousandth place tells us to leave the 9 in the hundredth place.
[tex]v\approx 1.79 \ cm^3[/tex]
The volume is about 1.79 cubic centimeters.
Answer:
D = 1.79 cm^3
Explanation:
Use the formula Volume = Mass / Density with what you've been given.
V = 38.5 g / 21.5 g/cm^3
V = 1.790697674 = 1.79 cm^3
What is the coefficient for iron when the equation below is balanced?
Fe + Cl2 = FeCl3
A) 1
B) 4
C) 3
D) 2
The coefficient for iron (Fe) in the balanced chemical equation is 3.
How does the balance chemicals equation look like?Lets first analyse the chemical equation presented to us which is Fe + Cl2 = FeCl3
The number of iron atoms on each sides is 1. However, the number of Cl atoms on the left and right sides is 2 and 3, respectively.
To balance the equation, we need to make sure tht the same number of atoms of each element is present on both sides of the equation.
To balance the number of Cl atoms, we need to add a coefficient of 2 to FeCl3 which becomes Fe + Cl2 → 2FeCl3
For us to o balance the number of Fe atoms, we need to add a coefficient of 3 to Fe. It becomes 3Fe + Cl2 → 2FeCl3
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Chemsitry help pleasee
Answer:
The halogens
Explanation:
In the s and p-blocks, the halogens have the highest value of electronegativity.
This is because they only need one electron to complete their configuration.
Electronegativity is the tendency of an atom to draw electrons to itself in a covalent bond. Halogens requires just one electron to complete their octet. In a bond, they have more electronegativity than other elements. The most electronegative atom is located in the halogen group.In each case, state whether the forces are balanced or unbalanced. If unbalanced, calculate the net force and describe the direction of the resultant force.
Answer:
Check explanation section.
Explanation:
In order to understand balanced force and unbalanced forces the first law of Newton should be considered as a basic knowledge.
For Balanced forces, there is equal equality in the direction of the forces. In balanced forces, there is no acceleration.
For unbalanced forces, there is acceleration that is go say there is going to be movement. Therefore, net force is equal to unbalanced forces.
(i) Suitcase dropped from a height.
Answer: since there is movement that is acceleration, then the force here is unbalanced force. The resultant force is downwards.towards the greater force direction.
(ii) A bicycle moving with constant velocity on a straight road.
Answer: As the bicycle moves at constant velocity on the straight road the force here is Balanced. Frictional forces balances the forces from the cyclist.
(iii) The rope does not move in a tug of war on applying force at both ends.
Answer: Balanced force.
how many moles are present in 100 grams of potassium?
Answer:
39.0983.
Explanation:
we (get) up at 4:30 yesterday morning
Answer:
oop oof
Explanation:
The autonomic nervous system consists of what parts?
A. Sympathetic
B. Autonomic
C. Parasympathetic
D. Somatic
HELP PLEASE
Answer:
A. Sympathetic
and
C. Parasympathetic
Explanation:
Ap3x
A gas occupies 11.2 liters at 0.860 atm. What is the pressure if the volume becomes 15.0 L? (Boyle)
Answer:
0.642 atmExplanation:
The new pressure can be found by using the formula for Boyle's law which is
[tex]P_1V_1 = P_2V_2[/tex]
Since we are finding the new pressure
[tex]P_2 = \frac{P_1V_1}{V_2} \\[/tex]
From the question we have
[tex]P_2 = \frac{11.2 \times 0.86}{15} = \frac{9.632}{15} \\ = 0.64213333...[/tex]
We have the final answer as
0.642 atmHope this helps you
Given:
Initial Volume [tex] \sf (V_1) [/tex] = 11.2 L
Initial Pressure [tex] \sf (P_1) [/tex] = 0.860 atm
Final Volume [tex] \sf (V_2) [/tex] = 15.0 L
To Find:
Final Pressure [tex] \sf (P_2) [/tex]
Concept/Theory:
[tex] \bf{ \underline{Boyle's \: Law} \: (Pressure - Volume \: Relationship)}[/tex]
"At constant temperature, the pressure of a fixed amount of gas varies inversely with the volume of the gas."
[tex] \bf{P \propto \dfrac{1}{V} \: (at \: constant \: T \: and \: n)}[/tex]
It can be also stated as "At constant temperature, the product of pressure and volume of fixed amount of a gas remains constant."
[tex] \bf{PV = Constant}[/tex]
If the initial pressure and volume of a fixed amount of gas at constant temperature are [tex] \sf (P_1) [/tex] & [tex] \sf (V_1) [/tex] and final pressure of the gas is [tex] \sf (P_2) [/tex] and volume occupied is [tex] \sf (V_2) [/tex], then according to Boyle's law;
[tex] \bf{P_1V_1 = P_2V_2 = Constant}[/tex]
OR
[tex] \bf{\dfrac{P_1}{P_2} = \dfrac{V_2}{V_1}}[/tex]
Answer:
By using Boyle's Law, we get:
[tex] \rm \longrightarrow \dfrac{0.860}{P_2} = \dfrac{15.0}{11.2} \\ \\ \rm \longrightarrow P_2 = \dfrac{11.2}{15.0} \times 0.860 \\ \\ \rm \longrightarrow P_2 = \dfrac{9.632}{15.0} \\ \\ \rm \longrightarrow P_2 = 0.642 \: atm[/tex]
[tex] \therefore [/tex] Final Pressure [tex] \sf (P_2) [/tex] = 0.642 atm
57.1% carbon, 6.16% hydrogen, 9.52% nitrogen, and 27.18% oxygen
Calculate the speed of a dog running through a field if he is covering 23.7 meters in 54 seconds.
Explanation:
speed = distance/time
= 23.7/54 m/s
= 0.44 m/s
speed of a dog running through a field = 0.44 m/s
According to the Octet Rule, an element is most stable with ______________ valence electrons
Group of answer choices
eight
ten
five
three
1.
Which chemical equation represents a double replacement reaction?
Answer:
AX+BY=AY+BX
Explanation:
Double-replacement reactions are represented by the general equation AX+BY=AY+BX a reaction in which a substance combines with oxygen, releasing a large amount of energy in the form of light and head
identify the law that explains the following observation nitrogen dioxide can be formed by reacting 14 G of nitrogen with 32 grams of oxygen
Answer:
The law of definite proportions. I had the same question for chemistry and this is what they said was right so I got 100%.
Explanation:
Can You Tell?
Pepsinogen is released in the stomach. Why can't it digest stomach walls?
Answer:
Specific cells within the gastric lining, known as chief cells, release pepsin in an inactive form, or zymogen form, called pepsinogen. By doing so, the stomach prevents the auto-digestion of protective proteins in the lining of the digestive tract.
Explanation:
Make sure to edit so you don't get copy-writed
An element contains only one kind of
A. particle. B. property. C. protein. D. raw material.
Answer:
A
Explanation:
an element contains only one kind of particle
Please do the worksheet
Predict: What is likely to happen to electrons in the atom pictured above?
-the atom will gain 3 electrons
-the atom will lose 5 electrons
-the atom is unreactive and electrons will not move
-the atom will gain 8 electrons
The atom will gain 3 electrons
Further explanationValence electrons are electrons that are used to bond which are located in the outer shell of the atom
The electron configuration of N :
[He] 2s² 2p³
This configuration shows that there are 5 valence electrons in the outer shell of the N atom
So based on the octet rule, the N atom will bind 3 more electrons to make it stable
An example is the formation of covalent (triple) bonds in the formation of N2 molecules
which type of bond joins nonmetals atoms to nonmetal atoms
Answer:
Ionic bonds form when a nonmetal and a metal exchange electrons, while covalent bonds form when electrons are shared between two nonmetals. An ionic bond is a type of chemical bond formed through an electrostatic attraction between two oppositely charged ions.
Explanation:
That's what google said.
A hypothesis .........
Answer:
all of the above
Explanation:
a hypothesis is indeed the second step. it also can be tested since you made it beforehand. it also is supposed to be educated. so all of the above.
Answer:
All of the above
Explanation:
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Rahul was given iron filings and sulphur powder. He prepared a compound of iron sulphide by heating the components in a china dish. What would be his observation if he adds a few drops of dilute sulphuric acid into the compound?
Answer:
A gas with a rotten egg smell is evolved
Explanation:
When iron fillings and sulphur were heated in the vessel, the following chemical reaction took place;
Fe(s) + S(s) -----> FeS(s)
This is a direct combination reaction.
Subsequently, when dilute H2SO4 is added, the following reaction takes place;
FeS(s) + H2SO4(aq) ------> FeSO4(aq) + H2S(g)
He immediately observes the evolution of a gas with a rotten egg smell.
if a neutral atom has an atomic number of 23, how many electrons does it have?
In the quantum mechanical model, what two words do they use to describe
particles?
Answer:
This question is incomplete
Explanation:
This question is incomplete but one can assume the answer from the definition of quantum mechanics. Quantum mechanics is the science that describes particles in nature at the atomic and subatomic particle (electron, proton and neutron) level. Thus it can be assumed that atoms and subatomic particles are used to broadly describe particles.
State the types of change that take place in each of the following
a)Burning a piece of charcoal .........
b) Heating copper (ii) carbonate strongly....
c) Heating Zinc oxide strongly
In a experiment to determine the percentage o
40cm3 of 0.51
Answer:
Chemical changes
Explanation:
a)Burning a piece of charcoal - chemical change
b) Heating copper (ii) carbonate strongly - chemical change
c) Heating Zinc oxide strongly - chemical change
The given types of reaction indicates chemical changes. A chemical change is one in which a new kind of matter is formed. It is always accompanied by energy changes. The process is not easily reversible and hence, it is a permanent procedure.
Burning of charcoal produces a new kind of produces in the combustion process.
Both heating of copper(ii)carbonate strongly and zinc oxide will lead to a decomposition reaction in which new compounds are formed.
Consider the following reaction: 4HCl(g)+O2(g)→2H2O(g)+2Cl2(g) Each of the following molecular diagrams represents an initial mixture of the reactants.(Figure 1)
How many molecules of Cl2 would be formed from the reaction mixture that produces the greatest amount of products?
Answer:
A
Explanation:
The number of molecules of Cl₂ that would be formed from the reaction mixture that produces the greatest amount of products is 4.
What are molecular diagrams?Molecular diagrams are the representations of the chemical reaction, with the help of molecular orbital theory. They show the chemical bonding and linear combination of the elements.
Now, here the reaction is
4HCl(g)+O₂(g)→2H₂O(g)+2Cl₂(g)
Diagram b has 8 molecules of HCl (limit reagent) and 3 molecules of O₂. This is the reaction that will produce the greatest amount of product.
Hence, b is taken for the number of chlorine.8 molecules of HCl need to combine with 2 molecules of oxygen to produce 4 molecules of Cl₂. The reaction's stoichiometry shows this to be the case.
Thus, there will be four, 4 molecules of chlorine that would be formed from the reaction.
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what would happen to a gummy bear after soaking for 2 days in distilled water
Answer:
it would expand
Explanation:
the gummy bear would absorb alot of water
Answer:If a gummy bear is soaked in distilled (pure) water for 24 hours, then the gummy bear will increase in size
Explanation:
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it is only multiple choice q
Answer:
Q1. B
Q2. D
Q3. C
Hope it helps............
Plz mark as brainliest
