Answer:
72.14878 grams
Explanation:
Geologists obtain indirect evidence about Earth’s interior by
a.
measuring pressure differences at Earth’s surface.
b.
estimating temperature inside earth.
c.
directly looking under the many layers.
d.
recording and studying seismic waves.
Answer:
I'm sure it's D.
Explanation:
They obtain evidences by recording and studying seismic waves.
Define compound in your own words
Answer:
I think the compound is a chemical bound the compound o cant say I trying
Explanation:
oh the compound is a chemical substance like atoms like H2O and other atoms they have many compounds I think this should be ans
if its ans is too long you want then tell me in comment
The energy levels of an atom are occupied by
A.electrons
B.protons
C.neutrons
D.ions
Answer:
A: electrons
Explanation:
The movement of an object toward earth Soley because of gravity is called
Answer:constant acceleration. A steady change in velocity.
Explanation:
A sample of a compound contains 3.21 g of sulfur and 11.4 g of fluorine. What is the empirical formula of the compound?
Answer:
[tex] SF_{6}[/tex]
Explanation:
Let the compound be x.
Given the following data;
Sulfur, S = 3.21g
Fluorine, F = 11.4g
Atomic mass of sulfur = 32.07g
Atomic mass of fluorine = 19g
Amount of moles for sulfur;
3.21*(1/32.07) = 0.10mol
Amount of moles for fluorine;
11.4*(1/19) = 0.60mol
We then divide by the smallest to find the ratio;
(0.10/0.10) = 1 Mol of sulfur.
(0.60/0.10) = 6 Mol of fluorine.
Therefore, the ratio of sulfur to fluorine is 1:6.
Compound x = [tex] SF_{6}[/tex]
Hence, the empirical (simplest) formula of the compound is [tex] SF_{6}[/tex]
The total bonding energy for the products of a reaction is 2535 kJ/mol and the bonding energy of the reactants is 1375 kJ/mol. Calculate the change in enthalpy, and classify the reaction as endothermic or exothermic.
-1160 kJ/mol, endothermic
1160 kJ/mol, exothermic
-1160 kJ/mol, exothermic
1160 kJ/mol, endothermic
Answer:
-1160kj/mol
Explanation:
the reaction is exothermic because heat is released to the environment
Use your periodic table of elements. Take any element from the second column, except for beryllium and calcium, and answer the following
questions: (5 points)
What is the element's name and symbol?
Is it a meial, nonmetal, or metalloid?
Which family does it belong to?
How many protons, neutrons, and electrons does its neutral atom have?
Answer:
Radium (Ra)
Metal
Alkaline Earth Metal
Protons & Electrons: 88
Neutrons: 138
Explanation:
Answer:
magnesium, Mg, metal, alkaline earth metals, its neutral atom has 12 protons and 12 neutrons and 12 electrons
I WILL MARK BRAINLIEST ANSWER!
Which statement describes heterogeneous mixtures?
1. They are made up of two or more Pure substances that are not chemically bonded together and appear non-uniform
2. The substances they are composed of can only be separated chemically
3. The substances they are composed of have fixed ratio between their components
4. They are made up of two or more pure substances that are chemically bonded together appear uniform
Answer:
1. They are made up of two or more Pure substances that are not chemically bonded together and appear non-uniform
Explanation:
edge2020 :)
Heterogenous mixtures are made up of two or more substances that are not chemically bounded together and which appear non-uniform.
What are heterogenous mixtures?Heterogenous mixtures is defined as a type of mixture where in the composition is not uniform throughout the mixture.It consists as two or more phases. The phases are chemically distinct from each other.
As there are two or more phases present in heterogenous mixtures they can be separated by solvent extraction where in one phase is miscible with the solvent and the other phase is immiscible.
Components of a heterogenous mixtures are distinctly visible . There are two types of heterogenous mixtures, the colloids and the suspensions.These two vary with each other with respect to particle size.
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Which of the following is an element?
A
MgBr
B
HCl
C
O
D
Cu(SO4)3
Oxygen is a chemical element with symbol O and atomic number 8. Classified as a nonmetal, Oxygen is a gas at room temperature.
How could sinking a ship to create an artificial reef address the problem?
A.
More divers would come to the area to explore both reefs.
B.
Many divers would go to the artificial reef instead of the natural reef.
C.
There would be more places for new species to enter the ecosystem.
D.
There would be fewer places for marine organisms to live.
Answer:
C. There would be more places for new species to enter the ecosystem.
Explanation:
The Shipwrecks established artificial reefs that address the problem of a natural reef.
The artificial reefs provide a stable growing area for corals, and habitat for fishes and new organisms along with food sources that is found in natural reefs. This helps to increase the growth of marine life.
Hence, the correct answer is "C. There would be more places for new species to enter the ecosystem."
I NEED HELP !!! PLEASE I AM TIMED !! :(( Will mark brainliest i need the right answer these finals killing me... especially chem
Answer:
its d
Explanation:
Answer: it is D
step by step
Is it a model answer key
Answer:
is what a model answer key
I am going to go with yes. Imao
why is an atom electrically neutral
NEED THIS NEED TO GET OFF ITS MY BRO BDAY NEED IT FOR A BIG GRADE NEed it SO BAD
Answer:
he is right, top right
Explanation:
Question 3
When an electron absorbs energy and jumps it is:
a negative ion
in the ground state
a positive ion
in the excited state
Help please
Answer:
in the excited state
Explanation:
Because in excited state an atom has more energy
How many atoms of Hydrogen are in the 3 molecules of glucose?
3C6H12O6?
Answer:
36 hydrogen atoms in 3 molecules of glucose
Explanation:
The formula for one molecule of glucose is C₆H₁₂O₆
There are 12 hydrogen atoms in one molecule so in three molecules there would be 36
True or false: Some parasites have complex life cycles where they live in different species of hosts at different stages
Answer:
true
Explanation:
Answer:
True there are a few.
Explanation:
Two electrons in the 1s orbital must have different spin quantum numbers to satisfy
Hund's Rule
The Magnetic Rule
The Pauli Exclusion Principle
The Aufbau Principle
Answer: The Pauli Exclusion Principle
Explanation:
The electrons are filled in orbitals of equal energy with one electron entering each orbital until all the orbitals contain one electron with the same spin. The pairing of electrons take place thereafter.
The first electron in an orbital could have +1/2 spin or -1/2 spin. All of the electrons in singly occupied orbitals have the same spin so as to maximize total spin. which is given by Hunds rule.
Two electrons must have opposite spin and thus different spin quantum numbers is given by Pauli's exclusion principle.
What is a reduction reaction? O A. A reaction in which negatively charged particles are in the products B. A reaction in which charged particles form an ionic compound C. A reaction in which an atom has gained 1 or more electrons D. A reaction in which an atom forms a new isotope by gaining neutrons
Answer:
C
Explanation:
Reduction is a chemical reaction that involves the gaining of electrons by one of the atoms involved in the reaction between two chemicals. The term refers to the element that accepts electrons, as the oxidation state of the element that gains electrons is lowered.
Which of the following best describes a galaxy?
A. a particle of debris in the solar system that does not act as a satellite of any planet.
B.a visible body of liquid or frozen crystal droplets suspended above a planetary surface
C. a massive system of stars, gas, dust, and dark matter bound together by gravity
D.The visible path of a meteoroid as it enters Earth's atmosphere
Need help ASAP
Answer: the anser is a
Explanation:
The galaxy is a massive system of stars, gas, dust, and dark matter bound together by gravity. Option C is correct.
What is gravity?The galaxy is a force of attraction that attracts the particles or abject towards themselves and it gets double the mass of the object and has the capacity to bound the objects.
In a galaxy all are revolving around the orbits and satellites due to gravity and all these stars dust etc are also part of the universe which is bounded by The galaxy is a massive system of stars, gas, dust, and dark matter bound together by gravity
Therefore, Option C is correct.The galaxy is a massive system of stars, gas, dust, and dark matter bound together by gravity
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Why is no chemical reaction necessary to extract gold?
Explanation:
Because gold is a very unreactive metal and exists as a pure substance (instead of oxides).
If an atom has a mass number of 52 and has 28 neutrons, what is the atomic number?
Answer:
24
Explanation:
52-28=24
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you guys are amazing
I just wanted you to know that
that's it
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why are you still reading?
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JK AGAIN!
you are all...
wonderful
smart
beautiful (inside and out)
loved
and cared for
so don't go
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because you are a queen/king
Answer:
Thank you I needed this
you are...
wonderful
smart
beautiful (inside and out)
loved
and cared for
so don't go
you gotta be here
you gotta be here to spread your amazingness
because you are a queen/king
YES YOU ARE and SO IS EVERYONE ELSE, I HOPE YALL ALL STAY SAFE AND HAVE A GREAT DAY >-<
Mole Conversion: How many atoms are in 0.830 moles of gold?
Answer:
4.99 × 10²³ atomsExplanation:
The number of atoms of gold 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 = 0.83 × 6.02 × 10²³
We have the final answer as
4.99 × 10²³ atomsHope this helps you
A student measures the time it takes for two reactions to be completed.
Reaction A is completed in 12 seconds, and reaction B is completed in 21
seconds. What can you conclude about the rates of these reactions?
A. The rates of reactions A and B are equal.
B. The rate of reaction A is lower.
C. The rate of reaction B is lower.
Answer:
c
Explanation:
because the left side of reactant is take more time to make a product than the first
The rate of these reactions should be considered as the option b. The rate of reaction A is lower.
Conclusion of the rate of reactions:Since Reaction A is completed in 12 seconds, and reaction B is completed in 21 seconds.
So based on this, we can say that the rate of reaction A should be lower as it contain 12 seconds as compared to reaction b.
hence, the option b is correct.
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145.8g of Mg contains how many moles?
In which interaction is the prey harmed?
Commensalism
Competition
Mutualism
Predation
Answer:
predation.
Explanation:
predation. means the preying of one animal on others
Answer:
Predation
Explanation:
Because one organism eats another. The PREDATOR benefits, the PREY is harmed.
Hope it helps!
What is the main purpose of the second paragraph?
Name the components of an atom which determines each of the following
quantities
A. Mass of an atom
B. Charge of an atom
Answer:
answer is Proton.
Explanation:
because electron is too heavy and other one has no charge
Acceleration due to gravity on the moon is greater / less than acceleration due to gravity on Earth. The mass of an object on the moon is less than / greater than / the same as it is on Earth. Using the equation F = ma to calculate weight, the mass of an object is multiplied / divided by acceleration due to gravity. So, the weight of an object on the moon is greater / less than the weight of the same object on Earth.