Answer:
nucleus
Explanation:
Answer:
Found in the nucleus
Explanation:
I hope this answer is correct and helpful!
At a high concentration do you have more or less particles per unit volume
Answer:
More particles per unit volume
Explanation:
Concentration means the amount of solute in a solution. Now, the amount of solute also means the number of particles of solute present in a solution.
Hence, when we use the term "high concentration", we imply that the amount of solute present or the number of particles present in a solution is high.
Thus, at high concentration, there are more solute particles than solvent particles in a solution.
WILL GIVE BRAINLIEST!!
What adaptation helps the pelican to swim?
Big wings
Long beak
Strong legs
Webbed feet
How many joules of heat are needed to raise the temperature of 30.0 g of aluminum from 22°C to 80°C, if the specific heat of aluminum is 0.90 J/g°C?
Answer: There are 1566 joules of heat needed to raise the temperature of 30.0 g of aluminum from 22°C to 80°C, if the specific heat of aluminum is 0.90 J/g°C.
Explanation:
Given: Mass = 30.0 g
Specific heat = [tex]0.90 J/g^{o}C[/tex]
[tex]T_{1} = 22^{o}C[/tex]
[tex]T_{2} = 80^{o}C[/tex]
Formula used to calculate the heat energy requires is as follows.
[tex]q = m \times C \times (T_{2} - T_{1})[/tex]
where,
q = heat energy
m = mass of substance
C = specific heat capacity of substance
[tex]T_{1}[/tex] = initial temperature
[tex]T_{2}[/tex] = final temperature
Substitute the values into above formula as follows.
[tex]q = m \times C \times (T_{2} - T_{1})\\= 30.0 g \times 0.90 J/g^{o}C \times (80 - 22)^{o}C\\= 1566 J[/tex]
Thus, we can conclude that there are 1566 joules of heat needed to raise the temperature of 30.0 g of aluminum from 22°C to 80°C, if the specific heat of aluminum is 0.90 J/g°C.
A rarefraction is generated when particles move
A:together
B.closer
C.under
D.apart
What is not matter in chemistry??
Explanation:
Examples of things that are not matter include thoughts, feelings, light, and energy. Light, heat, kinetic and potential energy, and sound are non-matter because they are massless.
Consider the statement:
“The following report presents the results of our laboratory tests, which support the conclusion that our new treatment for acne is safe and effective with minimal possible side effects.”
What questions should a person ask themselves to determine if this scientific study is reliable?
What does the acne medicine look like?
What does the acne medicine smell like?
Were laboratory tests conducted by the same company that produces the acne medicine?
Were laboratory tests conducted in a laboratory with more than 100 employees?
The question the person should ask him/herself to probably check for authenticity of the drugs is "Were laboratory tests conducted by the same company that produces the ac[tex]\cap[/tex]e medicine?". Option C. This is further explained below.
What is a scientific study?Generally, scientific study is simply defined as a method that includes making conjectures and deriving answers as logical implications from the hypotheses.
In conclusion, Were laboratory tests conducted by the same company that produces the ac[tex]\cap[/tex]e medicine should be questioned as medical companies should look to other labs for authenticity confirmation.
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A certain element has a half-life of three years.
If you currently have a 10g sample of that element and you know that it has undergone five half-life decays, how many grams of the element were in the sample originally?
A
150g
B
160g
C
320g
D
50g
(C) 320 g
Explanation:
A = A02^(-t/hl)
where hl = half-life
A0 = original amount
A = present amount
t = elapsed time = 5 half-lives
10g = A02^(-5) = A0/32
A0 = 32×(10 g) = 320 g
Use the dichotomous key to identify these plant leaves.
Leaves from which plant are shown?
pine
catalpa
dogwood
maple
Answer:
catalpa
Explanation:
i took the test
A small ferret comes to help Roxie with the rock that is blocking her den. They push with a total force of 90 N moving the boulder a distance of 5m. How much work do they do?
Answer:
Work = 450 J
Explanation:
Force = 90N
Distance = 5m
Work = ?
The relationship between these quantities is given by the equation:
Work = Force * Distance
Work = 90 * 5
Work = 450 J
A solution is any mixture of two or more substances.
TRUE or
FALSE
Answer:
true
Explanation:
In 2Fe+3Cl2=2FeCl3, how much iron (Fe) is needed to produce 4 moles of FeCl3?
In 2Fe+3Cl2=2FeCl3, how much FeCl3 is produced when 5 moles of Fe react in excess chlorine?
Answer:
4 mol Fe
5 mol FeCl₃
Explanation:
Step 1: Write the balanced equation
2 Fe + 3 Cl₂ ⇒ 2 FeCl₃
Step 2: Calculate how much iron (Fe) is needed to produce 4 moles of FeCl₃
According to the balanced equation, the molar ratio of Fe to FeCl₃ is 2:2.
4 mol FeCl₃ × 2 mol Fe/2 mol FeCl₃ = 4 mol Fe
Step 3: Calculate how much FeCl₃ is produced when 5 moles of Fe react in excess chlorine
According to the balanced equation, the molar ratio of Fe to FeCl₃ is 2:2.
5 mol Fe × 2 mol FeCl₃/2 mol Fe = 5 mol FeCl₃
What is the pH of a 0.21 M solution of LiOH?
Answer:
13.32
Explanation:
pOH=-log(0.21)=0.68
pH=14-pOH=14-0.68=13.32
What is described by the frequency of a wave?
A. The speed the wave is traveling through space
B. The number of waves that pass a point in 1 second
C. The height of the wave from trough to peak
D. The distance from one peak to the next peak
Taking into account the definition of frecuency, the statement "The number of waves that pass a point in 1 second" describes the frequency of a wave.
Definition of frequencyFrequency is the number of vibrations that occur in a unit of time. Its unit is s⁻¹ or hertz (Hz).
In other words, the frequency in wave phenomena, such as sound, electromagnetic waves (such as radio or light), electrical signals or other waves, expresses the number of times the phenomenon is repeated per unit of time. For example, if a wave repeats ten times per second, it means that it has a frequency of ten cycles per second.
SummaryFinally, the statement "The number of waves that pass a point in 1 second" describes the frequency of a wave.
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Convert 444 cal to joules
Answer: 1
Decimal Answer: 1.858
In the buffer solution CH3COsH(aq) -> H3O+(aq) + CH3CO2-(aq)
A. H3O+ is an acid, and CH3CO2H is its conjugate base.
B. CH3CO2H is an acid, and CH3CO2- is its conjugate base.
C. H3O+ is an acid, and CH3CO2- is its conjugate base.
D. CH3CO2H is a base, and H3O+ is its conjugate acid
In the buffer solution CH₃COOH (aq) ---> H₃O⁺(aq) + CH₃CO₂⁻(aq):
CH₃CO₂H is a base, and H₃O⁺ is its conjugate acid.
Option D is correct.
What is an acid?An acid is described as a molecule or ion capable of either donating a proton, known as a Brønsted–Lowry acid, or forming a covalent bond with an electron pair, known as a Lewis acid.
From the buffer solution above, H₃O⁺ is the conjugate acid because it donates a proton (H⁺) to a base CH₃CO₂H.
In conclusion, A conjugate acid, within the Brønsted–Lowry acid–base theory, is described as a chemical compound formed when an acid donates a proton (H⁺) to a base.
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Help for brainliest
Answer:
those things that looks like cristals
How many molecules are in 5.00 grams of NH3?
a 0.294
b 0.333
C 1.77 x 1023
d 6.68 x 1022
e 2.00 x 1023
Answer:
C. 1.77x 1023
Explanation:
Not sure please correct me if im wrong
If you have 2.9 x 10^21 atoms of nitrogen, how many moles do you have?
Answer: Approximately [tex]0.48 \times 10^{-2} \ \text{ mole}[/tex]
============================================================
Explanation:
There are roughly 6.02 * 10^23 atoms in one mole of any element. So we have 6.02 * 10^23 atoms in one mole of nitrogen.
We can then do the following conversion:
[tex]\left(2.9 \times 10^{21} \ \text{ atoms of nitrogen} \right)\times \left(\frac{1 \ \text{ mole}}{6.02 \times 10^{23} \ \text{ atoms}}\right)\\\\\frac{2.9 \times 10^{21}}{6.02 \times 10^{23}} \ \text{ mole}\\\\\frac{2.9}{6.02} \times 10^{21-23} \ \text{ mole}\\\\0.48172757 \times 10^{-2} \ \text{ mole}\\\\0.48 \times 10^{-2} \ \text{ mole}\\\\[/tex]
NEED HELP ASAP 20 POINTS !!!!!What does a subscript in a chemical formula tell you? For example the 3 in Rb3PO4 the number of atoms of the element symbol it follows the number of atoms of the element symbol it is in front of the number of molecules
Answer:
The answer should be A
Explanation:
because the definition of a subscript is that they indicate the number of atoms of an element present in am molecule or formula unit.
Answer:
The first choice. The rule is go left. Those subscript numbers always talk about the element to the left of them.
Explanation:
The straight forward answer is the first one.
You should always answer that when reading the chemical make up of molecules. Let's look at some examples.
C8 H18
Consider the 8. It must be describing how many carbons there are. If it was meant for the hydrogen, then what does the 18 mean? You wouldn't know.
Now look at something a lot more complicated.
Mg3(PO4)2
Use the going left rule. That satisfies Mg doesn't it? There are 3 of them and 3 is correct.
The two at the end is also straightforward if you think about it. It must be telling you how many molecules are in the brackets. If that were not so, then you wouldn't be able to tell what it did. So there are 2 PO4
But you still have the 4 to deal with. Use the going left rule again. 4 must be telling you how many oxygens you have inside the brackets. There are 4 of them.
Which best describes nuclear fusion? O A nucleus spontaneously splits and absorbs energy O Two nuclei spontaneously combine and absorb energy. O A nucleus collides with a neutron and splits, releasing energy. O Nuclei combine to form a heavier nucleus, releasing energy.
Answer: Nuclei combine to form a heavier nucleus, releasing energy.
Explanation: e.g two deuterium nucleus (Hydrogen-2 isotopes) forms an He nucleus and energy is released.
Nuclear fusion is when nuclei combine to form heavier nuclei, releasing energy.
What is Nuclear Fusion?Nuclear fusion is a reaction in which two or more atomic nuclei are combined to form one or more different atomic nuclei and subatomic particles (neutrons or protons). The difference in mass between the reactants and products is manifested as either the release or absorption of energy.
The release of energy with the fusion of light elements is due to the interplay of two opposing forces: the nuclear force, a manifestation of the strong interaction, which holds protons and neutrons tightly together in the atomic nucleus; and the Coulomb force, which causes positively charged protons in the nucleus to repel each other.
Nuclear fusion is also observed in stars.
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a concentrated solution of sulfuric acid, H2SO4, has a concentration of 18.0 M. How many mL of the concentrated acid would be required to make 250. mL of a 1.00 MH2SO4 solution?
Answer: A 13.88 mL of the concentrated acid would be required to make 250. mL of a 1.00 M [tex]H_{2}SO_{4}[/tex] solution.
Explanation:
Given: [tex]M_{1}[/tex] = 18.0 M, [tex]V_{1}[/tex] = ?
[tex]M_{2}[/tex] = 1.00 M, [tex]V_{2}[/tex] = 250 mL
Formula used to calculate the volume of concentrated acid is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\18.0 M \times V_{1} = 1.00 M \times 250 mL\\V_{1} = \frac{1.00 M \times 250 mL}{18.0 M}\\= 13.88 mL[/tex]
Thus, we can conclude that 13.88 mL of the concentrated acid would be required to make 250. mL of a 1.00 M [tex]H_{2}SO_{4}[/tex] solution.
The speed you read from your speedometer is your ____________________. *
average speed
direction
instantaneous speed
distance
Answer:
it is your instantaneous speed
Explanation:
PLEASE HELP.
What does the atomic number of an element tell us?
A) the number of neutrons in an atom of an element
B) the number of protons in an atom of an element
C) the number of protons, electrons, and neutrons in an element
why do different people have differently shaped proteins?
The sequence of amino acids in the chain determines how the chain will fold up to make the protein, so different proteins have different three-dimensional shapes. ... This is because proteins form attachments and interact with many other molecules and structures inside organisms.
Pretend your friend was absent from class today...
Write what you would say if you had to explain how and why elements to
your friend.
Answer:
how and why elements what?? why they exist?? im gonna assume that's what you meant, so elements exist because we're all on earth and without elements, we don't have resources to live. the earth is made of elements and if there were none, we wouldn't even have a planet
Explanation:
^
How many grams of H2 are needed to completely react within 50g of N2?
Answer: 10.7 grams
Therefore, 10.7 grams of Hydrogen are necessary to fully react with 50.0 grams of Nitrogen.
36 g of KOH was dissolved in 800 mL of water. What is the
molality of the solution? (Molar mass of KOH = 56 g/mol,
density of water = 1.00 g/mL) ___ m.
Answer: 0.8 m
Explanation:
H2O2 (yield) H2O + O2
If 650 grams of hydrogen peroxide is allowed to decompose, how much water and
oxygen will be created? If 255 grams of oxygen are collected, what is the percent
yield?
13) Which "conversion tool" below would you use to complete this
conversion?
A rocket launches because of __________.
A. an opposite reaction
B. it's large mass
C. its gravity
D. air resistance
Answer:
an opposite reaction
Earth's gravity is still pulling down on the rocket. When a rocket burns propellants and pushes out exhaust, that creates an upward force called thrust. To launch, the rocket needs enough propellants so that the thrust pushing the rocket up is greater than the force of gravity pulling the rocket down.