Answer:
Fe₃PO₄
Explanation:
They have given the total mass of the compound, the mass of iron and the mass of phosphorus. So we can find the mass of oxygen.
Mass of oxygen = 12.17 - (7.77 + 1.44) = 2.96g
So we can now find the empirical formula.
Element - mass - Mr - Mass÷Mr - Ratio - Simplest Ratio
Fe - 7.77g - 55.8 - [7.77÷55.8] - [0.14÷0.05] - 2.8 = 3
P - 1.44g - 31 - [1.44÷31] - [0.05÷0.05] - 1
O - 2.96g - 16 - [2.96÷16] - [0.19÷0.05] - 3.8 = 4
[The simplest ratio was obtained by dividing the answer of mass÷mr with the smallest value. Phosphorus had the smallest value of mass÷mr=0.05, so all other answer were divided by 0.05]
Emperical formula = Fe₃PO₄
Fill in the blank:
A correctly written hypothesis uses an ____ ______ statement
Answer:
a theory of a experiment and the experiment acts like a judge determining if the hypothesis is right or wrong from the final test result
Explanation:
Write the charges for each part of this equation.
Answer:
the Aluminium Al have +3 charges and idion have I) have - 2 charges
11. Bacteria and dead cells are removed from circulatory
fluid in the
A) urinary bladder
C) alveoli
B) gallbladder
D) lymph nodes
To solve this we must be knowing each and every concept related to lymph node. Therefore, the correct option is option D among all the given options.
What is lymph nodes?A lymph node, sometimes known as a lymphatic gland, is indeed a kidney-shaped lymphatic and immune system component. The lymphatic veins connect a massive amount of lymph nodes to one another throughout the body.
Most lymph nodes lie within the trunk adjacent to other major structures in the body - such as the paraaortic lymph nodes and the tracheobronchial lymph nodes. The lymphatic drainage patterns are different from person to person and even asymmetrical on each side of the same body. Bacteria and dead cells are removed from circulatory fluid in the lymph nodes.
Therefore, the correct option is option D.
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please help fast thank yuo
Answer:
what is your question tell may i can help you
Answer:
decrease as we go down a group I know ionisation energy increases from left to right across the periodic table
Which statement does not identify a characteristic of antibodies?
A They are produced by the body in response to the presence
of foreign substances.
B They may be produced in response to an antigen.
© They are nonspecific, acting against any foreign substance in
the body.
D They may be produced by white blood cells.
Answer:
they are produced by the body in response to the presence of foreign substance
PLEASE HELP I DON´T KNOW WHAT THE DIFFERENCE BETTWEEN THE TWO IS!
What is the difference between a product and a reactant.
Answer:
A reactant is a substance that is present at the start of a chemical reaction. A product is a substance that is present at the end of a chemical reaction.
Explanation:
23. An organism develops active immunity as a result of
A) manufacturing its own antigens
B) producing antibodies in response to a
vaccination
C) receiving an injection of antibodies produced
by another organism
D) receiving an injection of a dilute glucose
solution
a
Answer:
B is correct.
Explanation:
A vaccination will trigger the organism to prepare antibodies as a measure of protection against a sickness.
Here is Beck's address:
12 Riverdale Lane, Apartment A
San Jose, California
USA
Imagine each of the five parts of Beck's address represents Earth, the Milky Way, the moon, the solar system, or the universe, based on their sizes. Which of the
following parts of Beck's address would represent the solar system?
O California
O 12 Riverdale Lane
San Jose
O USA
Answer:
The answer is San Jose
what is the molarity of a koh solution if 25.0 ml neutralizes 35.0 ml of a 0.200 m hcl solution?
If 25.0ml neutralizes 35.0 ml of a 0.200M HCl solution, the molarity of KOH solution is 0.28M
The reaction between KOH solution and HCl is written below.
[tex]HCl + KOH \rightarrow KCl + H_2O[/tex]
Volume of KOH, [tex]V_B[/tex] = 25.0 ml
Volume of HCl, [tex]V_A=35.0 ml[/tex]
Molarity of HCl, [tex]C_A=0.200 M[/tex]
Molarity of KOH, [tex]C_B=?[/tex]
Number of moles of HCl, [tex]n_A=1[/tex]
Number of moles of KOH, [tex]n_B=1[/tex]
The mathematical equation for neutralization reaction is:
[tex]\frac{C_AV_A}{C_BV_B} =\frac{n_A}{n_B}[/tex]
Substitute [tex]C_A=0.200 M[/tex], [tex]n_A=1[/tex], [tex]n_B=1[/tex], [tex]V_B[/tex] = 25.0 ml, and [tex]V_A=35.0 ml[/tex] into the equation above in order to solve for [tex]C_B[/tex]
[tex]\frac{0.2 \times 35}{C_B \times 25}=\frac{1}{1} \\\\25C_B=7\\\\C_B=\frac{7}{25} \\\\C_B=0.28M[/tex]
Therefore, the molarity of KOH solution is 0.28M
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a 7.221 g sample of a compound contains 1.990 g carbon, 2.341 g hydrogen, and the rest is oxygen. Determine the
percent composition of the compound
Answer:
17.19%
Explanation:
mass of oxygen = 7.221 - (1.990 + 2.341)
= 2.890g
Empirical formula of the compound
For carbon,
1.990/12 = 0.1658
For hydrogen,
2.341/1 = 2.341
For oxygen,
2.890/16 = 0.1806
0.1658 ÷ 0.1658 = 1
2.341 ÷ 0.1658 = 14.11
0.1806 ÷ 0.1658 = 1.089
Empirical formula of the compound= CH14O
Molar mass= (1×12) + (14×1) + (1×16)
= 12+14+16
= 42g/mol
percentage composition= 7.221/42 × 100
= 17.19%
isotopes of an element contain different numbers of
typhoons are more violent than hurricanes
Answer:
i think it is FALSE.
Explanation:
good luck
Which statement below describes the behavior of a Molecules when a substance changes from a gas to liquid
Answer:
As a substance changes from a solid to a liquid to a gas, its molecules first the molecules are moving fast enough, they are able to "escape." They leave the surface of the liquid as gas molecules. Evaporation is not the only process that can change a substance from a liquid to a gas. The same change can occur through boiling.
Explanation:
hopfully this helps!
Q2. Fill in the blank with correct words.
A: Chemical B: Horizontal C: Shells D: Columns E: Group VII
1) The vertical ___________are called groups and the_____________rows are
called periods.
2) Elements in the same groups have the same number of electrons in their
outer_______________ for example, all the elements in ___________ have 7
electrons on their outer shells.
3) Elements in the same group have similar ___________ and physical properties
Answer:
Explanation:
1) The vertical Columns are called groups and the Horizontal rows are
called periods.
2) Elements in the same groups have the same number of electrons in their
outer Shells for example, all the elements in Group VII have 7
electrons on their outer shells.
3) Elements in the same group have similar Chemical and physical properties
Explanation:
1) Columns
Horizontal
2)Shell
Group VII
3)Chemical
HELP!!!!
Which of the following has the smallest electron affinity?
а К
b Ca
C Li
d Na
e Mg
Answer:
e. Mg.
Explanation:
Answer:
[tex]mg[/tex]
is the answer to your question
Melting gold with other metals makes 10 karat gold. Which term best describes 10 karat gold
The 10 karat of gold formed by melting gold with other metals is described as homogeneous mixture.
A pure substance is a substance that is made up of only one kind of particle. This type of substance consist of only one element.
A heterogeneous substance is a type of substance that is made up two or more substances existing in different phases.
A homogeneous substance is a type of substance that is made up of two or more substances evenly mixed. This type of substance exist only in one phase.
Thus, the 10 karat of gold formed by melting gold with other metals is described as homogeneous mixture.
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Answer:
homogeneous mixture
Explanation:
Describe what a reversible reaction is.
A reversible reaction is a reaction in which the conversion of reactants to products and the conversion of products to reactants occur simultaneously.
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PLEASE PEOPLE I NEED HELP PLEASE IF YOU SEE THIS HELP ME ! :,(
NO LINKS !!!! PLEASE :)
Answer: 5.5 7.5 102
Explanation: using the equation above you can get these %s
HELP PLEASE ASAP ILL GIVE BRAINLEST
Answer:
D
Explanation:
braineist pls???????????
Answer:
C
Explanation:
gram is bigger than atom duh
Mendeleev's arrangement of the periodic table was in order of increasing ____.
A. atomic number
B. atomic mass
C. neutron number
D. valence electron number
Answer:
B. atomic mass
Explanation:
He arranged the elements into rows in order of increasing mass so that elements with similar properties were in the same column.
What are 2 substances that can CAN conduct electricity? Plz explain.
Answer:
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thє ѕuвѕtαncєѕ thαt cσnduct єlєctrícítч αrє cαllєd cσnductσrѕ.
thє єхαmplєѕ σf cσnductσrѕ αrє -
ѕílvєr cσppєr gσldhσpє hєlpful~
~ єхhαuѕtєd zσmвíєAnswer:
There are two categories of materials that are good conductors of electricity: metals and plastics. Metals conduct in the solid state because they contain mobile electrons, or electrons that may move about freely. When a copper wire is utilized in an electrical circuit, electrons pass through it every time the switch is flipped...
Explanation:
what is the ph of a peach with a [ –oh] = 3.2 × 10 –11 m?
Answer:
Amerigo Vespucci, was the first European to reach the Caribbean Islands.
Please select the best answer from the choices provided
T
F
Explanation:
Given the equation
N2(g) +3H2 (g)--> 2NH3 (g)
1 mole of N2 gas is needed to completely react with 3 moles of H2 gas.
How many molecules of H2 gas are needed?
Answer:
1.81 x [tex]10^{24}[/tex] molecules H2
Explanation:
Use Avogadro's number:
3 moles H2 x 6.022 x [tex]10^{23}[/tex] molecules= 1.81 x [tex]10^{24}[/tex] molecules H2
dose any body know 2(-3+6)=
______
3
Answer: The answer is 6
1) Simplify -3+6 to 3.
2×3
And then Simplify.
6
Sorry if im wrong
Determine the highest occupied energy level in the
following elements:
a. He
b. Be
c. Al
d. Ca
e. Sn
which type of bonding is found in all substances made up of molecules?
Answer:
Chemical bonds
Explanation:
Chemical bonds are forces that hold atoms together to make compounds or molecules. Chemical bonds include covalent, polar covalent, and ionic bonds. Atoms with relatively similar electronegativities share electrons between them and are connected by covalent bonds.
Estimate the pressure of 16.25 moles of methane on a 10l container at 300k. Round to the nearest atmosphere
Answer:
The pressure of 16.25 moles of methane = 40 atm
Explanation: there you go
HELP PLSS ASAP PLEASE
Answer:
5.24 x 10^23
Explanation:
Avogadro's constant is 6.02 x 10^23
1 mol = 6.02 x 10^23
0.87 mol = 6.02 x 10^23 x 0.87 = 5.24 x 10^23 (2.d.p)
magnesium nitrate contains chemical bonds that are
Answer:
Magnesium Nitrate is an ionic compound formed by:
Magnesium;Mg+2 (the cation) and Nitrate NO−3 (the poly-atomic anion).
In order for these two ions to bond, the charges must be equal and opposite. Therefore, it will take:
two -1 nitrate ions to balance the one +2 magnesium ion.
100 PIONTSSSS PLZ HELP
Draw the correct structural formula for the following molecules
Answer:
Explanation:
how do u draw on here