Help help chem question
Answer:
D. 4.20%
Explanation:
Given the following data:
Accepted value = 524 degrees
Experimental value = 546 degrees
To find the percentage error;
Percent error can be defined as a measure of the extent to which an experimental value differs from the theoretical value.
Mathematically, it is given by this expression;
[tex] Percent \; error = \frac {accepted \;value - experimental \; value}{ accepted \;value} *100[/tex]
Substituting into the equation, we have;
[tex] Percent \; error = \frac {524 - 546}{ 524} *100[/tex]
[tex] Percent \; error = \frac {22}{524} *100[/tex]
Note: the negative sign is ignored when calculating percentage error.
[tex] Percent \; error = 0.04199 *100[/tex]
Percent error = 4.199 ≈ 4.2%
Where is carbon dioxide and oxygen exchanged at capillaries?
Answer:
Gas exchange takes place in the millions of alveoli in the lungs.
Explanation:
Gas exchange takes place in the millions of alveoli in the lungs and the capillaries that envelop them. As shown below, inhaled oxygen moves from the alveoli to the blood in the capillaries, and carbon dioxide moves from the blood in the capillaries to the air in the alveoli.
Ground water, the largest source of fresh water, is stored in bodies of rock and or sediment
a. porosity
b. sediment
c. particles
d. aquifers
i dont even know what this means
Answer:
particles
Explanation:
oof oof oof oof oof oof oof
how many moles are in 32.3g of calcium phosphate
Answer: the formula mass of calcium phosphate [Ca3(PO4)2] is 310.177 amu, so its molar mass is 310.177 g/mol. This is the mass of calcium phosphate that contains 6.022 × 1023 formula units.
Answer: 310.177
Im dum.b help
When a grasshopper egg hatches, a baby grasshopper called a pupa comes out of the egg and begins to grow. Although the nymph grasshopper already looks like a grasshopper, it still needs to molt its exoskeleton many times before becoming a full-grown adult."
Which statement corrects the error in the passage?
Question 3 options:
A baby grasshopper is a larva.
A baby grasshopper is a nymph.
The grasshopper nymph hatches.
The nymph has no exoskeleton.
Answer:
2.A baby grasshoper is a nymph.
Explanation:
Answer:
yourinagenjitsulol
Expert
75 answers
3.6K people helped
Answer:
2.A baby grasshopper is a nymph.
Explanation:
i agree
How would the reactivity of an element with one valence electron vary from an element with 8 valence electrons
Answer:
An element with 1only one valence electron is extremely reactive while an element with 8 valence electrons is very stable and does not react most of the times
Explanation:
Valency is the number of electrons in the outermost shell of the atom. It shows the ease with which elements react and combine with each other.
An element can take a maximum of 8 electrons in most of its outermost shells. As a matter of fact, the goal for its stability is to attain a structure with all 8 slots for electrons in its outer shell filled up. The element can either do this by adding or removing electrons.
The ease with which it adds or removes the electrons shows its reactivity. If it has only one electron to lose, (the valence electron) the element will be very reactive because this is relatively easier to do when compared with 2 electrons, three electrons, and so on. An element with 8 electrons in its outer shell is very stable and does not need to react anymore. an example of this is Neon and Argon.
4.91 M NaOH solution (density=1.04g/ mL)
6. Which of the following best describe the graph of linear inequalities in two
variables?
A. Straight line
C. Half-plane
B. Parabola
D. Half of a parabola
7. Which of the following inequalities is represented by the given
graph?
A. 2x + 2y > 2
C. 3x + 2y > 2
B. 3x + 2y = 2
D. 3x - 2y < 2
1
8. An inequality using a < or > has a line.
A. horizontal
C. solid
B. broken
D. vertical(h).
9. Which is the correct inequality for the shaded region?
A. y = - x - 1
C. y > -x - 1
B. y <- x + 1
D.y > x - 1
10.What type of line and what way would you shade with the sign "<"?
A. broken, shaded up
C. broken, shaded down
B. solid, shaded up
D. solid, shaded down
11. Given the graph of y? 2x - 5 below, which of the following
ordered pair satisfies the inequality?
A. (2,-5)
C. (-2,-7)
B. (5,2)
D. (5,-7)
I gave brainlest ...
Answer:
I hope I can help youExplanation:
I hope I can help youAs per the following graph that best describes the linear inequality in two variables is included in a straight line.
The linear inequality divided the coordinates plane into two halves. Here one half represents the solution and the other the inequality. Hence the option A is correct. The inequality that is represented by the graph is 3x + 2y = 2, Hence option B is correct. The correct inequality for the shaded region is y <- x + 1, hence the option C is correct. The line and shade with the sign "<" means that they are broken and shaded up. Hence the option A is correct. The given graph consists of equation 2x - 5 where to find Y in order of the pairs that satisfy the inequality are (5,2) hence the option B is correct.Learn more about which of the following is best described.
brainly.ph/question/8809815.
What is 360mL of fluids measured in cc's?
Answer:
360mL is 360 cc
Explanation:
1 ml to cc = 1 cc
need helped for this
Home can use ____to distribute warm air from a sunroom
Answer:
Solarpannels? I honestly don't know I'm just trying to be helpful.
(25 POINTS AND BRAINLIEST)What is the volume of 2 mol of chlorine gas at STP?
2.0 L
11.2 L
22.4 L
44.8 L
Answer:
44.8
Explanation:
According to standard temperature and pressure and ideal gas equation , the volume of 2 mole of chlorine gas at STP is 44.8 liters.
What are standard temperature and pressure conditions?Standard temperature and pressure are defined as a standard set of conditions required for experimental measurements which are established to allow comparison between different sets of data.
Standards which are commonly used are those International Union of pure and applied chemistry and national institute of standards and technology.These are not universally accepted standards but are the ones which are commonly used.
Standard conditions of pressure and temperature are necessary to define standard reference conditions used to express volumes of liquids and gases.
These values are important to physicists, chemists ,engineers ,pilots and navigators.On substituting values in ideal gas equation, volume= 2×8.314×273/1=44.8 liters.
Thus, the volume of 2 mole of chlorine gas at STP is 44.8 liters.
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The atomic mass of Cu is 63.5. Find its electrochemical equivalent
Answer:
The electrochemical equivalent of copper, Cu, is 3.29015544 × 10⁻⁷ g/C
Explanation:
The given parameters are;
The element for which the electrochemical equivalent is sought = Copper
The atomic mass of copper = 63.5
The electrochemical equivalent, 'Z', of an element or a substance is the mass, 'm', of the element or substance deposited by one coulomb of electricity, which is equivalent to a 1 ampere current flowing for a period of 1 second
Mathematically, we have;
m = Z·I·t = Z·Q
We have;
Cu²⁺ (aq) + 2·e⁻ → Cu
Therefore, one mole of Cu, is deposited by 2 moles of electrons
The charge carried one mole of electrons = 1 Faraday = 96500 C
∴ The charge carried two moles of electrons, Q = 2 × 96500 C = 193,000 C
Given that the mass of an atom of Cu = 63.5 a.m.u., the mass of one mole of Cu, m = 63.5 g
[tex]Z = \dfrac{m}{Q} = \dfrac{63.5 \ g}{193,000 \ C} = 3.29015544 \times 10^{-4} \, g \cdot C^{-1}[/tex]
∴ Z = 3.29015544 × 10⁻⁴ g/C = 3.29015544 × 10⁻⁷ g/C
The electrochemical equivalent of copper, Cu, is Z = 3.29015544 × 10⁻⁷ g/C
You do an experiment in which you need 0.25 mole of tyrosine (C,H11 NO3).
How many grams must you weigh out?
A). 45.3 g
B). 90.5 g
C). 181 g
D). 272 g
Answer:
B.90.5 g
Explanation:
not 100%sure hehe
Answer:
45.3
Explanation:
I got it wrong on my test and this was the only correct option for me.
what is the formula mass of MgO (how much does one mole of it weigh)
Answer:
40.3044 g/mol
Explanation:
hope this helps
HELP ME! IM SO DESPERATE I WILL GIVE YOU BRANLIEST!!!!!!!!!!!!!!!!
Write the complimentary DNA strand for the given strand of DNA
CGTAAGCGCTAATTA
Answer:
The answer is GCATTCGCGATTAAT
Explanation:
"Chargaff's rule, also known as the complementary base pairing rule, states that DNA base pairs are always adenine with thymine (A-T) and cytosine with guanine (C-G). A purine always pairs with a pyrimidine and vice versa. However, A doesn't pair with C, despite that being a purine and a pyrimidine."
If this is not the answer, try the translation with the 5-3 Strategy and if not still then try using U instead of T.
During spontaneous fission, a nucleus of 25498Cf can produce 11846Pd, four neutrons, and what other nuclide?
Answer: 52Te - Tellurium
Explanation: Radioactivity occurs when an unstable nucleus of an element decompose into a stable element by emitting particles or forms of eletromagnetic energy. There are types of radioactivity and Spontaneous Fission is one of them.
In Spontaneous Fission, the unstable, also called parent, nucleus splits into two smaller nuclei and emitts one or more neutrons.
The reaction spontaneous fission of Cf is represented below.
25498Cf ⇒ 11846Pd + 4n + X
The characteristics of each element of the equation are:
1) The element Cf has atomic mass 254 and atomic number 98.
2) Element Pd has atomic mass 118 and atomic number 46.
3) Neutron is represented as n, has no atomic number and atomic mass 1.
Given these properties, to determine the other nuclide, we have to find out the nuclide's atomic number, as each element in the periodic table has its own atomic number.
At the left side of the equation, atomic number is 98. At the right side, element X's atomic number is
98 - 46 + 0 = 52
In the periodic table, the element with atomic number 52 is Tellurium, whose symbol is Te.
The other nuclide for the spontaneous fission is Tellurium (Te).
what element has the same number of valence electrons as argon
Answer: There are two elements actually and those elements are Carbon and Silicon
Explanation:Plz mark brainliest if im right
how many grams are in 7.4 moles of HgS?
Answer: 1721.6 grams
Explanation:
Gas
% of Volume
7.
N
78
Oz
21
Ar
.9
CO2
.04
Ne
1.0018
He
.00052
CHA
.00017
Kr
.00011
H2
.00006
Using the chart above, which gases make up the majority of the Earth's atmosphere?
HELP ASAP
Answer:
this would be the .04 it is very simple
Explanation:
9.32 x 1024 atoms of NaOH
Explanation:
65463.68 atoms of NaOh I believe.. I really dont know sorry
Which plant structures are common to all angiosperms?
spores
flowers
cones
endoskeleton
Answer:
B
Explanation:
Phosphates are formed when phosphorus reacts with
A. carbon.
B. oxygen.
C. nitrogen.
Option B is correct. Phosphates are formed when phosphorus reacts with Oxygen
A phosphate group is formed from the bonding of four oxygen atoms to a phosphorous atom. The chemical reaction is as shown:
P + O₄ -> PO₄
P is the symbol of phosphorus
O is the symbol of oxygen
When both elements combine, they form phosphates.
Hence we can conclude that Phosphates are formed when phosphorus reacts with Oxygen
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Use the periodic table to determine which of the
following could be an isotope of bromine (Br).
Check all that apply.
Z = 79, A = 196
Z = 35, A = 79
A = 79, N =44
D Z = 44, N = 44
Answer:
A=79,N=44
Z=35,A=79
Answer:
Explanation:
Answer:
A=79,N=44
Z=35,A=79
How does environmental changes affect animals?
Environmental changes affect animals depending on their ability to adapt to new conditions.
What is adaptation?An adaptation is any type of phenotypic feature associated with a higher fitness in a particular environment.
Adaptations are features that allow organisms to adapt to challenging environmental conditions.
In conclusion, environmental changes affect animals depending on their ability to adapt to new conditions.
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what is the atomic number of an atom?
Answer:
The atomic number of an atom is the number of protons in the nucleus or the number of electrons in a neutral atom
Explanation:
How many significant figures are in this measurement: 1,250,500
HELP !!!!!!!!!!!!! PLEEEAAAAASSSSSSEEEE
Which of the situations below describes an ethical dilemma related to food
engineering?
Answer:
Pesticides protect our crops
Explanation:
How does energy play a role in different rock types forming? I had this question another time in my test and it's asking the same thing again.
Answer:
Yes
Explanation:
Yes, there are many energy forces that directly affect the formation of rocks and other substances. The Sun itself provides both energies in the form of heat/radiation and magnetic energy. Heat can get so intense when combined with pressure from being so far underground that it causes rocks to melt and become magma, which combines with other minerals and forms new types of rocks when they cool in the future. Magnetic energy helps push and pull the waves and wind on Earth which ultimately break down rocks into sand over the years.