Answer:
72.6% Error
Explanation:
% error = [tex]\frac{Real-Measured}{Real} * 100[/tex]
[tex]\frac{58.44-16}{58.44} *100= 72.6[/tex]
58.44 is the weight of NaCl
how many elements are present No and NO
Which describes a speed?
O A. Moving 8 meters in 2 seconds
O B. Falling down at 100 miles/hr
O C. Moving north at 40 km/hr
O D. Speed changing from 2 km/hr to 5 km/hr
Models can have the same
general appearance as real-ufe
objects.
True or false
Answer:
true
Explanation:
Answer:
True
Explanation:
Because its true
True or False
1. Magma with a high silica content will be less viscous, therefore be more fluid.
2. An increase of one on the Richter scale corresponds to a tenfold increase in the amplitude of body wave
3. Magma is found on the surface, lava is beneath the surface.
Answer:
Explanation:
1.false
2.true
2.true
Magma that contains high silica content will have higher viscosity. This is because they exhibit greater rate of polymerization unlike magma with less silica content
Therefore the number 1 statement is false.
A Richter scale is a device that is used to calculate an earthquakes size from the amplitude of the largest wave recorded by a seismograph.
One unit on the scale represents a 10-fold increase in the magnitude of an earthquake.
Therefore the number 2 statement is true.
Magma is a liquid rock found under the earth which can find its way to the surface of the earth through cracks and holes.
When magma finds its way to the surface of the earth it is called lava.
Therefore statement 3 is false.
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the illustration shows how sonar can be used to study the deep ocean which type of waves does sonar use
Answer:
d
Explanation:
b. Elements in the same period have what in common? (Look at the table)
Answer:
Elements in the same period have the same number of valence electrons as each other.
What happens to the stability of atoms when they form covalent bonds?
Answer
The two types of chemical bonds that atoms can form to achieve stability are called ionic bonds and covalent bonds. In ionic bonds, atoms donate or receive electrons to achieve stability. In covalent bonds, atoms share electrons to achieve stability.
Based on the Lewis/electron dot representation
of the two atoms, predict the ratio of metal
cationic (+) atom to nonmetal anionic (-) atom in
the compound.
.Ca.
.P.
A. 1:1
B. 3:2
C. 2:1
D. 3:1
Which of these is a compound
A) O
B)CO2
C)O2
D)Co
Answer:B. CO2
Explanation: It is B because it has both letters capitalized if it is a compound and it only has 1 letter capitalized if it is an element.
________________naturally helps cold-blooded animals warm up so that they can function.
Question 5 options:
Radiation
Convection
Warm Water
Heating pad
Answer:
Warm Water
Explanation:
In warm temperatures, cold-blooded animals are more active and can travel more quickly. This occurs because heat activated reactions provide energy to move muscles. In the absence of heat the animal becomes slow and sluggish. So they are usually inactive and rest when it is cold. As they do not need to feed much, they spend less time looking for food, so this life strategy works for them.
Brainliest?
Answer warm water Explanation:i have the same question
Is mass conserved when 40 g of sodium hydroxide undergoes a chemical change during an interaction with 37g of hydrogen chloride? Use complete sentences to support your answer by explaining how this can be demonstrated. (10 points)
Answer:
Mass is conserverd
Explanation:
Any chemical reaction must follow the law of conservation of mass. Meaning that mass cannot be created nor destroyed. Since all chemical reactions must follow this law, no matter what reaction happens, mass is conserved.
5. How many moles of aluminum sulfate would contain 3.54 x 1025 sulfur atoms?
Answer:
19.6 moles of aluminum sulfate
Explanation:
Given parameters:
Number of sulfur atoms = 3.54 x 10²⁵ atoms
Unknown:
Number of moles of aluminum sulfate = ?
Solution:
Aluminum sulfate is expressed as;
Al₂(SO₄)₃
1 mole of Aluminum sulfate contains 3 moles of sulfur.
6.02 x 10²³ atoms are found in 1 mole of any substance;
3.54 x 10²⁵ sulfur atoms will be found in [tex]\frac{3.54 x 10^{25} }{6.02 x 10^{23} }[/tex] = 58.8moles of sulfur
1 mole of Aluminum sulfate contains 3 moles of sulfur.
or ;
3 moles of sulfur is contained in 1 mole of aluminum sulfate
58.8moles of sulfur will contain [tex]\frac{58.8}{3}[/tex] moles of aluminum sulfate
= 19.6 moles of aluminum sulfate
All of the following are true about Vertical Migration, EXCEPT:
o Organisms descend back down to the Mesopelagic Zone at dawn to avoid predators.
o Organisms prevent the removal of atmospheric carbon
o Organisms vertically migrate 200-700 meters on average.
O Organisms vertically migrate under the cover of dusk to avoid predators.
Answer:
B
Explanation:
All are moving vertically but b is speaking about how they remove atmospheric carbon
15
4
(3.2)
52
2
1 2 3 4 5
(4) OX
Z
(2.-25
3
5
Based on the graph, the coordinates for Do. 1 of X are:
O (4,0)
O (5, 1)
O (3.-1)
Which property of a sound wave increases as the pitch of the sound
increases?
A. Amplitude
B. Wavelength
C. Rest position
ОО
D. Frequency
Answer:
the answer is d. frequency
2. Suppose 13.7 g of C2H2 reacts with 18.5 g O2 according to the reaction below. C2H2(g) + O2(g) → CO2(g) + H2O(ℓ) a. What is the mass of CO2 produced? b. What is the limiting reagent?
Answer:
Mass of CO₂ produced = 20.328 g
Oxygen is limiting reagent.
Explanation:
Given data:
Mass of C₂H₂ = 13.7 g
Mass of O₂ = 18.5 g
Mass of CO₂ produced = ?
What is limiting reagent = ?
Solution:
Chemical equation:
2C₂H₂ + 5O₂ → 4CO₂ + 2H₂O
Number of moles of C₂H₂:
Number of moles = mass /molar mass
Number of moles = 13.7 g/ 26.04 g/mol
Number of moles = 0.526 mol
Number of moles of O₂:
Number of moles = mass /molar mass
Number of moles = 18.5 g/ 32 g/mol
Number of moles = 0.578 mol
Now we will compare the moles of CO₂ with C₂H₂ and O₂
C₂H₂ : CO₂
2 : 4
0.526 : 4/2×0.526 = 1.052
O₂ : CO₂
5 : 4
0.578 : 4/5×0.578 = 0.462
The number of moles of CO₂ produced by O₂ are less thus oxygen will be limiting reactant.
Mass of CO₂ produced:
Mass = number of moles × molar mass
Mass = 0.462 mol × 44 g/mol
Mass = 20.328 g
How many electrons are in the outermost shell of the K+ ion in its ground state?
Answer:
If we look at the electron configuration of potassium (K), we see that it has one electron: [Ar]4s1. Obviously, removing that electron gives us [Ar] (same configuration as K1+), which is a noble gas and has 8 electrons. Valence electrons are generally regarded as being 'the outermost electrons' for a given atom
This chemical equation represents a chemical reaction.
HCl + NaOH - NaCl + H20
Which two chemicals are products in the chemical reaction?
A. NaOH
B. H20
C. NaCl
D. HCI
Explanation:
products are Nacl + H20
What happens to a Lithium atom for it to become an Li+1 ion?
Answer:
If an atom gains or loses an electron, it bacomes an ion. An atom that gains a negative electron, it becomes a negative ion. If it loses an electron it becomes a positive ion
Explanation:
A lithium atom has 3 protons and 3 electrons. It can lose one of its electrons, making it an ion. It now has more positive protons than electrons so it has an overall positive charge. Therefore it is a positive ion.
A fluorine atom will tend to gain, rather than lose, an electron. By gaining a negative electron, it has an overall negative charge. It has become a negative ion.
A sample of gas is placed into an enclosed cylinder and fitted with a movable piston. Calculate the work (in joules) done by the gas if it expands from 4.22 L to 15.61 L against a pressure of 5.63 atm.
Answer:
The work is -6,497.54 J
Explanation:
Work is the amount of energy transferred from one system to another by a force when a displacement occurs.
The work exchanged for a gas depends on the transformation it performs to go from the initial state to the final state.
The pressure - volume work done by a system that compresses or expands at constant pressure is given by the expression:
W= -P*ΔV
where
W is the work exchanged by the system with the environment. Its unit of measure in the International System is the joule (J), which is equivalent to Pa*m³P: Pressure. Its unit of measurement in the International System is the pascal (Pa). ∆V: Volume variation (∆V = Vfinal - Vinitial). Its unit of measurement in the International System is cubic meter (m³)In this case:
Wsystem=?P= 5.63 atm=570,459.8 Pa (being 1 atm=101325 Pa)ΔV=Vfinal - Vinitial= 15.61 L - 4.22 L= 11.39 L= 0.01139 m³ (being 1 L=0.001 m³)Replacing:
W= -570,459.8 Pa*0.01139 m³
Solving:
W=-6,497.54 J
The work is -6,497.54 J
Which of the following statements about ions is NOT CORRECT?
A. Anions are negative ions.
B. Anions are formed when an atom loses electrons.
C. Neutral atoms always have the same number of protons as electrons.
D. Cations are positive ions.
Answer:
B. Anions are formed when an atom loses electrons.
The statement about ions that is not correct would be B. Anions are formed when an atom loses electrons.
Why is this false ?Anions are formed when an atom gains electrons. This means that they have more electrons than protons, giving them a negative charge. Cations are formed when an atom loses electrons. This means that they have fewer electrons than protons, giving them a positive charge.
The other statements are correct. Neutral atoms always have the same number of protons as electrons. This means that they are electrically neutral. Cations are positive ions, and anions are negative ions.
In conclusion, option B is correct.
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Element X consist of two isotopes with masses of 62.9 and 64.9. The relative atomic mass of the element is 63.6. What is th
e percentage abundance of the lighter isotope? Show your working out.
Answer:
it is 50%
Explanation:
62.9x50=3145
64.9x50=3245
3245+3145=6390
6390/100=63.9
what do y'all girls find attractive on a guy?
Answer:
alot of things
Explanation:
The density of a substance is 1.63 grams per milliliter. What is the volume, in ml, of a sample of the substance with a mass of 5.40Kg? 1000 g = 1 kg
Answer:
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Explanation:
BRAINILY ANSWER NOW OLEASE I NEED HELP
explain why the Sun appears to move across the sky throughout the day.
Answer:
From Earth, the Sun looks like it moves across the sky in the daytime and appears to disappear at night. This is because the Earth is spinning towards the east. The Earth spins about its axis, an imaginary line that runs through the middle of the Earth between the North and South poles.
Explanation:
Answer:
The Earth rotates on its axis always, so it looks like the sun is moving but it is the Earth that's moving.
Explanation:
Hope this helps!
Dominant alleles uses
A.
Lower case alleles
B.
upper case alleles
C.
Upper and lower case alleles
D.
It doesn’t matter
Answer: Upper Case Alleles
Explanation: Lower case alleles are recessive
Calculate the number of C atoms in 0.716 mole of C?
Answer:
The answer is 4.31 × 10²³ C atoms
Explanation:
The number of C atoms can be found by using the formula
N = n × Lwhere n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
From the question we have
N = 0.716 × 6.02 × 10²³
We have the final answer as
4.31 × 10²³ C atomsHope this helps you
Why are there more fossils of marine organism than of land organisms o dc
Answer:
Three primary reasons. First, there is simply more water-covered places than dry ground places for the animals and plants to have lived. Second, the seas are much more crowded with the kinds of life that leave fossils than the land is. Third, the process that form fossils work very well under water.
Explanation:
Naming inconic compounds and lots of iconic naming
if you just look up the answer it comes up btw!!
have a great day
Select the best answer for the question.
16. Stoichiometry is the study of chemical reactions that BLANK
the particles.
Answer:
the answer is seperate
Explanation:
Stoichiometry is the study of chemical reactions that to calculate the number of mole that are used in the reactant and product of the particles.
What is Stoichiometry?Stoichiometry is the system of chemistry which is responsible to keep the data or information about the amount of reactant and the products which are taking part in a chemical reaction.
Balancing of any chemical equation is the main part of it by comparing the atom used as reactant and the number of atom used as a product. basically it signifies the relationship between the reactant and product.
It is only the quantitative analysis of the reaction not the qualitative one.
Therefore, stoichiometry is the study of chemical reactions that to calculate the number of mole that are used in the reactant and product of the particles.
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