Answer:
Convection currents are flowing fluid that is moving because there is a temperature or density difference within the material.
Because particles within a solid are fixed in place, convection currents are seen only in gases and liquids. A temperature difference leads to an energy transfer from an area of higher energy to one of lower energy.
True or false: Parasites help their host by providing nutrients to them
Answer:
true
Explanation:
Answer:
False..
Explanation: parasites do not provide you with anything good. The parasite obtains nutrition directly from the body of the host
Someone answer the limited regent...
Answer:
20 g Ag
General Formulas and Concepts:
Chemistry - Stoichiometry
Using Dimensional AnalysisChemistry - Atomic Structure
Reading a Periodic TableExplanation:
Step 1: Define
[RxN] Cu (s) + AgNO₃ (aq) → CuNO₃ (aq) + Ag (s)
[Given] 10 g Cu
Step 2: Identify Conversions
[RxN] 1 mol Cu = 1 mol Ag
Molar Mass of Cu - 63.55 g/mol
Molar Mass of Ag - 197.87 g/mol
Step 3: Stoichiometry
[tex]10 \ g \ Cu(\frac{1 \ mol \ Cu}{63.55 \ g \ Cu})(\frac{1 \ mol \ Ag}{1 \ mol \ Cu} )(\frac{197.87 \ g \ Ag}{1 \ mol \ Ag} )[/tex] = 16.974 g Ag
Step 4: Check
We are given 1 sig fig. Follow sig fig rules and round.
16.974 g Ag ≈ 20 g Ag
What does water's polarity cause?
after searching for artificial sweeteners, do you think it is appropriate to have diet pop available in your school?
A group of organs work together to perform a certain function is called?
Answer:
it's called an organ system
Answer:
organ system
Explanation:
I Honestly dont know if its correct but worth a shot
What causes some atoms of the same element to have different atomic masses?
Answer:
Isotopes are atoms of the same element that have different numbers of neutrons but the same number of protons and electrons. The difference in the number of neutrons between the various isotopes of an element means that the various isotopes have different masses.
Hope it helped
an electrical current only moves through a ____ circuit.
1.broken
2.new
3.closed
4.open
Answer:
Closed
Explanation:
ANSWER THESE 5 MULTPLE CHOICE QUESTIONS!!!
I'LL GIVE 30 POINTS AND A BRAINIEST:)
Answer:
Q 1 oxygen 2 6
Q2 D
Q3 B
4 Mg
5 B
Explanation:
Margie used arrows to represent the gases that enter and leave a plant during the process of photosynthesis, as shown below.
Answer:
the last one
Explanation:
Answer:
D
Explanation:
Carbon dioxide is returned to the atmosphere primarily by the
A)
eruption of volcanoes.
B)
respiration of consumers.
9.
fallout from solar flares.
D)
process of photosynthesis.
Answer:c or d
Explanation:
Answer:
yall its b
Explanation: cus i took the tested
what is represented on the periodic table by number 4
Answer:
there is nothing there?
Explanation:
An example of matter made up of only one type of element is
Answer:
Carbon, in all its states of matter.
Explanation:
What is the classification of igneous rock which forms from lava on the earths surface?(Why is there no option for Geology for the subject thing btw)
Answer:
Extrusive and intrusive are the two major types of igneous rocks. On the Earth's surface, extrusive rocks are created from lava, which is magma that has erupted from the underground. Intrusive rocks are formed from magma within the planet's crust that cools and solidifies.
Explanation:
Yeet
Alligators are the large predators that eat many smaller animals in a swamp how might removing the alligators from a swamp habitat create a decrease vegetation
In some types of decay, elements undergo transmutation. Which two
statements correctly describe this process?
A. The number of nucleons is the same before and after.
B. The parent element is different from the daughter element.
C. The number of atoms is conserved, but the number of nucleons
is not.
D. The atomic masses of the parent and daughter elements are the
same.
The statements which describes elements undergoing transmutation are the number of nucleons is the same before and after and the parent element is different from the daughter element.
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.
Learn more about element,here:
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Which is a difference between animal populations in primary succession and secondary succession?
A.
Animals can be present during the start of secondary succession, but they are never present during the start of primary succession.
B.
There is more animal biodiversity after the process of secondary succession has been completed.
C.
There is more animal biodiversity after the process of primary succession has been completed.
D.
Animals can be present during the start of primary succession, but they are never present during the start of secondary
Answer:
this may help
Explanation:
in primary succession, newly exposed or newly formed rock is colonized by living things for the first time. In secondary succession, an area that was previously occupied by living things is disturbed, then re-colonized following the disturbance.
Animals can be present during the start of secondary succession, but they are never present during the start of primary succession is a difference between animal populations in primary succession and secondary succession. Therefore, option A is correct.
What is primary succession ?When a new piece of land is produced or is first exposed, primary succession occurs. This may occur, for ex., when lava solidifies and forms new rocks or when a glacier recedes and reveals bare rocks. In the initial succession.
Primary succession takes place in a habitat that has never supported life. In a region that was formerly populated but had a disturbance, such a wildfire, secondary succession happens. In this case, dirt would still exist.
In primary succession, living organisms first occupy newly exposed or newly created rock. In secondary succession, a previously inhabited region is disrupted, then recolonized as a result of the disturbance.
Thus, option A is correct.
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Help would be much appreciated! i'll mark brainliest
Answer:
group 2
Explanation:
what is the most visible product of plate tectonic?
A.Mt.Apo
B.The Himalayas
C.Mt.Everest
Answer:
The Himalayas
Explanation:
Harry dissolved 9.36 g sample of LiOH into water in a calorimeter. The temperature of the calorimeter rose from 36.9 degrees Celsius to 52.8 degrees Celsius. The heat capacity of the calorimeter and its contents is 639 J/ degC. What is the enthalpy for the solution process if Harry repeats the lab again and 2.85 mol of the LiOH was dissolved? Given: the molar mass of LiOH is 23.95 g/mol.
Which sphere is dependent on all the other spheres in order to exist?
hydrosphere
lithosphere
atmosphere
biosphere
Answer:
biosphere
Explanation:
Living things need water (hydrosphere), chemicals from the atmosphere, and nutrients gained by eating things in the biosphere.
Explain how the rock cycle works.
Be sure to include the name of each type of rock in your description.
(Igneous rock, metamorphic rock, and sedimentary rocks)
If lithium and iodide form an ionic bond, which will be the anion
Answer:
lithium iodide is formed by sharing of electrons where is Potassium iodide is formed by opposite charges and electrostatic force between them.
Explanation:
2. Vitamin C is known to contain 1.20X1024 hydrogen atoms. Calculate the number of moles of hydrogen
The number of moles of Hydrogen : 1.993
Further explanationGiven
1.20 x 10²⁴ hydrogen atoms
Required
The number of moles
Solution
The mole is the number of particles(molecules, atoms, ions) contained in a substance
1 mol = 6.02.10²³ particles
Can be formulated :
N=n x No
N = number of particles
n = mol
No = Avogadro's = 6.02.10²³
moles of Hydrogen :
[tex]\tt n=\dfrac{N}{No}\\\\n=\dfrac{1.2\times 10^{24}}{6.02\times 10^{23}}\\\\n=1.993~moles[/tex]
A rigid cylinder with a movable piston contains a sample of hydrogen gas. At 350.
K, this sample has a pressure of 210. kPa and a volume of 9.50 L. What is the
volume of this sample at STP? (Round your answer to correct number of sig figs)
Answer: The volume of this sample at STP is 15.4 L
Explanation:
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 210 kPa
[tex]P_2[/tex] = final pressure of gas = 101.3 kPa ( at STP)
[tex]V_1[/tex] = initial volume of gas = 9.50 L
[tex]V_2[/tex] = final volume of gas = ? ( at STP)
[tex]T_1[/tex] = initial temperature of gas = 350 K
[tex]T_2[/tex] = final temperature of gas = 273 K ( at STP)
Now put all the given values in the above equation, we get:
[tex]\frac{210\times 9.50}{350}=\frac{101.3\times V_2}{273}[/tex]
[tex]V_2=15.4[/tex]
The volume of this sample at STP is 15.4 L
Select the correct answer from each drop-down menu.
A _ Is scientific knowledge established through direct observation and remalns constant. Sclentific knowledge can change
when scientists _
Answer:
A (Hypothesis) is scientific knowledge published through direct observation and remains constant scientific knowledge can change when scientists (generate hypothesis)
The half life for uranium-235 is 7.0x10 8years. a. How many half-lives did the sample go through at the end of 2.8x10 9years? b. How much of a 0.74mg sample of uranium-235 will remain after 2.8x10 9years?
Answer:
A 4 half-life
B. 0.05 mg
Explanation:
A. Determination of the number of half-lives after 2.8×10⁹ years.
From the question given above,
7×10⁸ years = 1 half life
Therefore
2.8×10⁹ years = 2.8×10⁹ years × 1 half life / 7×10⁸ years
2.8×10⁹ years = 4 half life
Thus, the sample went through 4 half-lives at the end of 2.8×10⁹ years.
B. Determination of the amount of the sample remaining after 2.8×10⁹ years.
Original amount (N₀) = 0.74 mg
half life (t½) = 7×10⁸ years
Time (t) = 2.8×10⁹ years
Amount remaining (N) =?
Next, we shall determine the rate of disintegration. This can be obtained as follow:
half life (t½) = 7×10⁸ years
Decay constant (K) =?
K = 0.693 / t½
K = 0.693 / 7×10⁸
K = 9.9×10¯¹⁰ /year
Finally, we shall determine the amount remaining as follow:
Original amount (N₀) = 0.74 mg
Time (t) = 2.8×10⁹ years
Decay constant (K) = 9.9×10¯¹⁰ /year
Amount remaining (N) =?
Log (N₀/N) = kt / 2.303
Log (0.74/N) = 9.9×10¯¹⁰×2.8×10⁹ /2.303
Log (0.74/N) = 2.772 / 2.303
Log (0.74/N) = 1.2036
Take the antilog of 1.2036
0.74/N = antilog (1.2036)
0.74 / N = 15.98
Cross multiply
0.74 = N × 15.98
Divide both side by 15.98
N = 0.74 / 15.98
N = 0.05 mg
Thus, 0.05 mg of the sample will remain after 2.8×10⁹ years
The amount of uranium sample remained after 4 cycles in [tex]\rm 2.8\;\times\;10^9[/tex] years has been 0.04625 mg.
The half-life can be described as the time required by the element to reduce to its half concentration from the initial concentration.
A. The number of half-life cycles can be calculated as:
[tex]\rm 7.0\;\times\;10^8[/tex] = 1 cycle
[tex]\rm 2.8\;\times\;10^9[/tex] = [tex]\rm \dfrac{1}{\rm 7.0\;\times\;10^8}\;\times\;2.8\;\times\;10^9[/tex]
= 4 cycles.
The number of half-life cycles after [tex]\rm 2.8\;\times\;10^9[/tex] years are 4 cycles.
B. The amount of sample remained can be calculated as:
Sample remained = Initial sample [tex]\rm \times\;\dfrac{1}{2}^\frac{time}{Half-life}[/tex]
Sample remained = 0.74 mg [tex]\rm \times\;\dfrac{1}{2}^\frac{2.8\;\times\;10^9}{7.0\;\times\;10^8}[/tex]
Smaple remianed = 0.74 [tex]\rm \times\;\dfrac{1}{2}^4[/tex]
Sample remained = 0.74 [tex]\times[/tex] 0.0625 mg
Sample remained = 0.04625 mg.
The amount of uranium sample remained after 4 cycles in [tex]\rm 2.8\;\times\;10^9[/tex] years has been 0.04625 mg.
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which eletric configuration represents an atom of lithium in an excited state?
Answer:
2-0-1, 1-1-1, 0-1-2, but they must all equal 3 electrons in total
Explanation:
Write the electron configuration for Gold
Answer:
[Xe] 4f145d106s1
Explanation:
Help ASAP
Avocados have a pH of 6.27. Avocados are categorized as...
O Base
O An Acid
O Neutral
Answer:
Base
Explanation:
Pls answer as quick as possible pls.
Assertion: Elements and compounds are pure substances.
Reason: Properties of compounds are different from those of its constituent elements.i) Both A and R are true and R is the correct explanation of the assertion.
ii) Both A and R are true but R is not the correct explanation of the assertion.
iii)A is true but R is false.
iv)A is false but R is true.
Answer:
The answer is number 3
Explanation:
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