Answer:
600 kj
Explanation:
thats just the answerr
If extinction is a normal part of ecosystems, and mass extinctions have happened before, why should humans be concerned about the rising extinction rate? What do current extinctions tell us about our impact on modern environments?
Answer:
we're terrible at keeping the earth clean and we know that lol
Explanation:
idrk
Humans should be concerned about the rising extinction rate as this accelerated rate prevents ecosystems from recovering or other species from filling voids in the food chain.
What is extinction?Extinction is the final phase of a sort of creature or a taxon—typically a species. Although the ability to reproduce and bounce back may have been lost earlier, the death of the last member of the species is typically considered to have been the moment of extinction.
Determining this point is challenging because a species' dynamic value may be quite wide, and is typically done after the fact. Due to this problem, there are phenomena like Lazarus taxa, in which a species that was thought to be extinct suddenly "reappears" after a duration of apparent absence. If extinction is a normal part of ecosystems, and mass extinctions have happened before, humans should be concerned about the rising extinction rate as this accelerated rate prevents ecosystems from recovering or other species from filling voids in the food chain.
Therefore, humans should be concerned about the rising extinction rate as this accelerated rate prevents ecosystems from recovering or other species from filling voids in the food chain.
To know more about extinction, here:
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Calculate the energy of light with a frequency of 5.21 x 104 Hz
Answer:
3.45*10^-29
Explanation:
E=hv
h is Planck's constant and v is the frequency (which was given to us)
E=6.626*10^-34 * 5.21*10^4
E=3.452146*10^-29
In a modern periodic table the element are arranged in order of increasing
Answer:
what are you asking?
Explanation:
If ice is added to a large fish tank and a small fish bowl, both at the same termperature, the large fish tank's water will cool faster because there is more water.
TRUE OR FALSE
Answer: False
Explanation:
When a object is touching a surface, it mostly likely will change the temperature it's on, depending on how it is. Since they both have different temperatures and cooling down at the same particularity rates, it is highly false that this would happen. What WOULD would the bowl cool faster THAN the water, then the ice will transform into water.
Hope this helps and make sure to thank me!
Shape, color, texture, size, are examples of
A. Physical properties
B. Elements
C. Chemical properties
D. Matter
Given 5 Moles of H20. how many moles of O, are produced. Use the following Equation
2H2+O2->2H2O
Moles O2 required : 2.5
Further explanationGiven
Reaction
2H2+O2->2H2O
Required
Moles of O2
Solution
The reaction coefficient in a chemical equation shows the mole ratio of the reacting compounds (reactants or products)
From the equation, mol ratio of H2O : O2 = 2 : 1, so moles O2 :
= 1/2 x mol H2O
= 1/2 x 5 moles
= 2.5 moles
An object of mass 800g hangs on a spring.Calculate the force exerted by the object if acceleration due to gravity is 10meters per second square
The force exerted : 8 N
Further explanationGiven
mass = 800 g
Acceleration = 10 m/s²
Required
The force exerted
Solution
Newton's 2nd law explains that the acceleration produced by the resultant force on an object is proportional and in line with the resultant force and inversely proportional to the mass of the object
∑F = m. a
[tex]\large {\boxed {\bold {a = \frac {\sum F} {m}}}[/tex]
F = force, N
m = mass = kg
a = acceleration due to gravity, m / s²
Input the value :
F = 0.8 kg x 10 m/s²
F = 8 N
Two plastic containers are washed in a dishwasher. One keeps its shape and the other becomes deformed.
Identify and compare the property of the plastic containers demonstrated in this example.
Describe the structure of the polymers that affect this property.
Enter your answer in the space below
PLEASE HELP ASAP!!!
Answer:
Polymers are used in everything from nylon stockings to commercial aircraft to artificial heart valves, and they have a key role in addressing international competitiveness and other national issues.
Polymer Science and Engineering explores the universe of polymers, describing their properties and wide-ranging potential, and presents the state of the science, with a hard look at downward trends in research support. Leading experts offer findings, recommendations, and research directions. Lively vignettes provide snapshots of polymers in everyday applications.
The volume includes an overview of the use of polymers in such fields as medicine and biotechnology, information and communication, housing and construction, energy and transportation, national defense, and environmental protection. The committee looks at the various classes of polymers—plastics, fibers, composites, and other materials, as well as polymers used as membranes and coatings—and how their composition and specific methods of processing result in unparalleled usefulness.
what is one of the most common elements in living things.
Which of the following is an example of the reflection of waves?
A)getting a sunburn
B)Your image in a mirror
C)light through the sunroof of a car
D)The movement of a sailboat
Answer:
C
Explanation:
The law of reflection says that for specular reflection the angle at which the wave is incident on the surface equals the angle at which it is reflected.
How many moles of Fe2O3 were used to produce with 11.5 moles of CO2 ?
Moles of Fe2O3 used : 3.83
Further explanationGiven
11.5 moles of CO2
Required
moles of Fe2O3
Solution
Reaction
Fe2O3 + 3CO ⇒2Fe + 3CO2
The reaction coefficient shows the mole ratio of the reacting compound (reactants or products)
From the equation, mol ratio of Fe2O3 : CO2 = 1 : 3, so mol Fe2O3 :
= 1/3 x moles CO2
= 1/3 x 11.5
= 3.83 moles
What are groups on the periodic table? How many are there?
Explanation:
Groups are numbered 1–18 from left to right. The elements in group 1 are known as the alkali metals; those in group 2 are the alkaline earth metals; those in 15 are the pnictogens; those in 16 are the chalcogens; those in 17 are the halogens; and those in 18 are the noble gases.
Answer:
The s-, p-, and d-block elements of the periodic table are arranged into 18 numbered columns, or groups.
SrBr2 lewis structure
Answer:
Okay?.......................
Which of the following shows the proper configuration of a straight chain isomer of nonane?
A.)A
B.)B
C.)C
Answer:
I need help with this as well if you get the answer please let me know
Explanation:
For the balanced equation shown below, if the reaction theoretically
should produce 7.99g CaO but experimentally produces 6.81 grams of
CaO, what is the percent yield?
CaCO3---->CaO+CO2
85.23%
0 14.77%
54.41%
O 117.33%
Answer:
Percent yield = 85.23%
Explanation:
Given data:
Theoretical yield = 7.99 g
Actual yield = 6.81 g
Percent yield of CaO = ?
Solution:
Formula:
Percent yield = ( actual yield / theoretical yield ) × 100
by putting values,
Percent yield = (6.81 g/ 7.99 g) × 100
Percent yield = 0.8523× 100
Percent yield = 85.23%
Which of these elements has the highest first ionization energy
A) oxygen
B) beryllium
C) fluorine
D) carbon
E) boron
i’ll give Brainliest please answer also i know this isn’t chemistry but brainly doesn’t have science
the answer would be iron. divide mass by volume to get density.
Answer:
B. Iron
Explanation:
Correct
1. What does the Law of conservation of mass state?
a. According to the Law of Conservation, what is true about the masses of the reactants and the products in a chemical reaction?
b. Find the missing mass in the reactions below:
MgO + H2O → Mg(OH)2
12.4 g ? 21.8
Answer:
According to the law of conservation of mass, the mass of the products in a chemical reaction must equal the mass of the reactants. The law of conservation of mass is useful for a number of calculations and can be used to solve for unknown masses, such the amount of gas consumed or produced during a reaction.
A barometer is a tool that scientists use to measure dew point , rainfall amounts, temperature, air pressure helppppp
Answer:
All of that is correct i am confused on what u are asking us to answer
Explanation:
Answer:
A barometer measures atmospheric/ air pressure ( D)
Explanation: I researched this topic prior to answering the following question.
What happens to the energy when you heat the iron? Why is this happening?
Answer:
When iron is heated in air it reacts with oxygen to form the compound iron oxide. Iron is a solid and oxygen is a gas. 5 Draw diagrams to show how the atoms are arranged in iron, oxygen and iron oxide in the circles below their names. Use different colours for the iron atoms and the oxygen atoms.
Explanation:
How many grams of water are produced from 0.198 grams of nitric acid?
2HNO3+Mg(OH2) = Mg(NO3)2+2H2O
Answer:
2+2H2O.We already learn it
Which of the following is not a trend that varies systematically in the periodic table
A ) electronegative
B) Symbol of elements
C) ionization energy
D) atomic radius
E) Ionic radius
Answer: B: Symbols of Elements
Explanation:
The periodic table is a table of chemical elements that shows us the trends and characteristics of the elements. The periodic trends are a specific pattern of the major and minor elements.
The trends are shown by the electronegativity, ionization energy, electronic affinity, ionic radius, atomic radius, and chemical reactivity. This trend arises from the changes in the atomic structure of the chemical elements.This pattern is based on the periodic laws and states that the chemical elements are put in order of increasing atomic number. However, they don't follow the symbols of elements.Hence the option B is correct.
Learn more about the is not a trend that varies systematically in the periodic table.
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How does the theory of plate tectonics explain the movement of the continents and changes to Earth’s surface such as volcanic eruption, earthquakes and mountain building?
For a reaction, AH = 198 kJ. For which value of TA Sis the reaction spontaneous?
Answer:
ah+j
Explanation:
How many atoms are in a 158.69 g sample of nickel?
1.6283 × 10²⁴ atoms Ni
General Formulas and Concepts:Math
Pre-Algebra
Order of Operations: BPEMDAS
Brackets Parenthesis Exponents Multiplication Division Addition Subtraction Left to RightChemistry
Atomic Structure
Reading a Periodic TableAvogadro's Number - 6.022 × 10²³ atoms, molecules, formula units, etc.Stoichiometry
Use Dimensional AnalysisExplanation:Step 1: Define
158.69 g Ni
Step 2: Identify Conversions
Avogadro's Number
Molar Mass of Ni - 58.69 g/mol
Step 3: Convert
Set up: [tex]\displaystyle 158.69 \ g \ Ni(\frac{1 \ mol \ Ni}{58.69 \ g \ Ni})(\frac{6.022 \cdot 10^{23} \ atoms \ Ni}{1 \ mol \ Ni})[/tex]Multiply/Divide: [tex]\displaystyle 1.62827 \cdot 10^{24} \ atoms \ Ni[/tex]Step 4: Check
Follow sig fig rules and round. We are given 5 sig figs.
1.62827 × 10²⁴ atoms Ni ≈ 1.6283 × 10²⁴ atoms Ni
A 2.8-kg pile of aluminum (rho = 2.70 g/cm3) cans is melted, then cooled into a solid cube. What is the volume of the cube?
Answer:
Explanation:
mass of aluminum 2.8 kg = 2.8 x 1000 = 2800 g
ρ = density of aluminum given = 2.7 g / cm³
density = mass / volume
volume = mass / density
= 2800 / 2.7
= 1037 cm³
So volume of cube required = 1037 cm³.
How many moles is 0.025 g of NaCO3? (Show Your Work)
mol of Na2CO3 = 2.36 x 10⁻⁴
Further explanationGiven
Mass : 0.025 g of Na2CO3
Required
moles
Solution
The mole is the number of particles contained in a substance
1 mol = 6.02.10²³
Moles can also be determined from the amount of substance mass and its molar mass :
mol = mass : molar mass
mass = mol x molar mass
Input the value :
mol = mass : MW Na2CO3
mol = 0.025 g : 106 g/mol
mol = 2.36 x 10⁻⁴
Which graph above shows an object’s acceleration? 1pt
a or b
and why did you choose the graph
Answer:
A. because the graph is moving uo
An element whose particles are atoms
Answer:
a chemical element
Explanation:
A chemical element is a substance that contains only one type of atom
BRAINLIST!!!
Water moving along the water cycle also moves through the Earth's environment in the form of rain, ice, snow, and surface water. This water has helped to shape the Earth's surface by which of the following processes?'
radioactive decay
chemical weathering
dissolving
physical weathering
oxidation
Answer:
I believe it is chemical weathering, physical weathering, oxidation, and dissolving...
Explanation: