Answer:
NaOH
Explanation:
Precipitation reaction can be used in wastewater treatment. When a contaminant forms an insoluble solid, then we can use this reaction to precipitate out the contaminated ions. In wastewater, a frequent presence of heavy metals can be found such as compounds of sulphide and hydroxide. So, we can add a source of hydroxide that is soluble (NaOH Or Na2S) that will result in a precipitation reaction.
A pharmaceutical company states in advertisements that their new ScarX Cream is guaranteed to erase scars in one month.
The company based their claims on a study done by the company's dermatologists.
The study showed that 84 percent of users said the sizes of their scars were reduced after using the product for 50 days. Do the study results support the company's claims?
Answer:d
Explanation:
the results indicated
Answer:
No, the results indicated that the scars were reduced, not erased.
Explanation:
beacuse i got it correct
the density of sulfuric acid is 1.84 g/mL. the mass of the sample is 25.0 what is the volume of L?
Answer:
Volume=46mL
Explanation:
density=1.84g/mL
mass=25.0g
volume=1.84×25
volume=46mL
Lithium and sodium show similar
chemical properties. Which of the
following statements is not true about
(a)They have equal number of electrons in their outermost shells
(b) Both exist in the +1 oxidation state in their compound
(c)They belong to the same group in the periodic table
(d) They are in the same period in the periodic table
Answer:
D
Explanation:
Iithium and sodium are not in the same period
1. CuCO^3------>CuO+CO^2 (g)
Word equation
State the characteristics or indications occurring in the above reaction
Answer:
A ----> A+B
Explanation:
CuCO3 is undergoing a decomposition reaction into the products copper(II) oxide and carbon dioxide gas.
Based on what you have read, what would be another example of kinetic energy?
A hammer hanging from a peg
Ahammer resting on a table
A hammer falling off a table
A hammer lying on a board
Answer:
its a hammer falling off a table
Explanation:
i think its cause the gravitational energy gets converted to kinetic energy when its falling down
The correct answer is a hammer falling off a table.
What is the meaning of kinetic energy?Kinetic energy is the energy that an item or particle has as a result of its movement. When work is done on an object by exerting a net force, the object accelerates and gains kinetic energy as a result.Is the kinetic energy of a hammer falling off a table?When the hammer falls off a table, the potential energy contained in the hammer is transferred to kinetic energy.
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Will the fire started by burning magnesium and methane let out by a fire extinguisher?! THIS IS EMERGENCY HERE!
Answer:
uh yes?
Explanation:
Answer:
i think so just try it
Explanation:
good luck
Elements in a group (column) on the periodic table can be expected to have similar
atomic masses.
atomic numbers.
numbers of neutrons.
properties.
Answer:
The answer is properties
Explanation:
Atomic masses,numbers and numbers of neutrons varies from each element on the periodic table but once they are in the same group they are expected to have similar properties.
Elements in a group (column) on the periodic table have similar properties.
Element in the periodic table are arranged according to there atomic number.
The atomic number of an element is the proton number of an element.
Elements in the same group have similar properties. The properties maybe chemical or physical properties.
For example group 1 elements are very reactive. This group 1 elements have charges of +1. There cations are represented as A⁺¹.
Generally, elements in the same groups have similar properties.
These properties maybe there metallic nature, reactivity, Valence electrons, valency, atomic size, ionization energy, electron-positivity and electron-negativity
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Convert 4.36 x 1025 molecules of CH,OH to moles.
Answer:
The answer is 72.43 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
From the question
N = 4.36 × 10^25 molecules
We have
[tex]n = \frac{4.36 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 72.425249...[/tex]
We have the final answer as
72.43 molesHope this helps you
pls helppp
Calculate the frequency for a wavelength of 485 nm.
Answer:
299792458/(485x10^-9)=6.181x10^14Hz = 618.1THz
Frequency x Wavelength = Speed of Light
therefore
Speed of light / Wavelength = Frequency
Question 2
Which of the following is a physical property?
Answer:
where are the choices?
Explanation:
What is an atomic theory?
A. An idea about what atoms are like
B. A prediction about nuclear reactions
C. A theory about how atoms first came to be
D. A theory about gravity
Answer:
a
Explanation:
What codes for the characteristics of an organism?
A None of the above
B) DNA in cells
The brain
D) The skin of an organism.
Coastal regions are often affected by abrasion what process would cause increased abrasion along a coastal region ?explain
Answer:
Coastal regions are often affected by abrasion. What process would cause increased abrasion along a costalregion? Abrasion is physical weathering caused by water, wind and gravity. The coastal regions areaffected by abrasion due to large volumes of water and increasedwinds.
Answer:
Hydraulic action of waves
Explanation: Coastal abrasion occurs as breaking ocean waves containing a sand and larger fragments erode the shoreline or headland. The hydraulic action of waves contributes heavily.
Which substance gets broken down in a homogeneous mixture? O colloid solution solute Osolvent
Answer:
Solute
Explanation:
i just did the quiz
Answer:
Solute
Explanation:
what does a fusion reaction always create?
Answer:
In fusion reactions, two light atomic nuclei fuse together to form a heavier nucleus and release a large amount of energy.
Alt. Answer:
Fusion is the process that powers the sun and the stars. It is the reaction in which two atoms of hydrogen combine together, or fuse, to form an atom of helium. In the process some of the mass of the hydrogen is converted into energy.
Explanation:
lol the internet
Answer:
A fusion reaction creates two light atomic nuclei that fuse together to form heavier nucleaus and realease a large amount of energy.
Explanation:
Which subatomic particle has the least mass?
electron
proton
neutron
positron
The atoms of an element are made of subatomic particles that include electrons, protons, neutrons, positrons, etc. The electron has the least amount of relative mass. Thus, option A is correct.
What are subatomic particles?Subatomic particles are the smallest unit that makes a whole atom. The positively charged particle, a proton has a relative mass of 1.672 × 10⁻²⁷ kg and is the same as the neutron particle.
Though the neutrons lack any charge and are present in the nucleus with protons. The other particle called electrons is negative in charge with a relative mass of 9.1 × 10⁻³¹ Kg.
The electron is outside the nucleus in the shells. The positrons have the same mass as an electron but carry an opposite charge and act as antimatter.
Therefore, option A. the electrons have the least amount of mass in an atom.
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#11
11. Kaitlyn wants to leave a 15% tip for a
restaurant bill of $42.76. How much should she
leave as a tip?
How could Armando use this model to test the idea that very steep hills lead to narrow, deep rivers?
Armando used this model to test the idea that you can modify the table legs using a certain sand size and record the results to test the hypothesis that extremely steep hills lead to narrow, deep rivers.
What is a model?A model is an artificial representation of an object or a process. Models are used to show the process or things that are very big and can not be understood by the actual thing.
Sand, granite, mud, and other objects from the earth are carried away by the energy of the rushing water, along with water-soluble substances like limestone.
Thus, depending on how quickly a river flows, it has more or less. The ability to remove more material, as the river runs more quickly when it is narrow than large, leads to the development of a deep and narrow river.
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The question is incomplete. Your most probably complete question is given below:
Using Models to Answer Questions About Systems
Armando’s class was looking at images of rivers formed by flowing water. Most of the rivers were wide and shallow, but one river was narrow and deep.
Armando’s class thinks that this river is narrow and deep because:
the hill that the water flowed down was very steep, or
the sand grains that the water flowed through were very small.
How does the Nervous System control the
Circulatory System?
This diagram shows a marble with a mass of 3.8 grams (g) that was placed into 10 milliliters (mL) of water. Using the formula D = MV, what is the density of the marble? 0.29 g/cm 3 0.38 g/cm 3 1.27 g/cm 3 2.63 g/cm 3
Answer:
1.27 g/cm^3
Explanation:
Density of a body is defined as mass/volume. We can easily read off the mass of the marble from the image.
Mass of the body = 3.8 grams
Volume of the body = 3 ml
Density of the body; mass/volume
D= 3.8/3
D= 1.27 g/cm^3
The element calcium forms the ion Ca2+. How many protons, Neutrons, and electrons does it have?
Answer:
18 electrons
20 neutrons
20 protons
Explanation:
Li+1 had gained ______ one electron
Which atoms would be bigger fluorine or bromine ?
In the cells of the human body, oxgen molecules are used directly in a process that what?
Answer:
cellular respiration. C6H12O6 + 6O2 → 6CO2 + 6H2O.
Explanation:
the process where cells convert chemical energy and/or nutrients into ATP and then the cells release the waste.
how does the latitude affect the temperature
Answer:
Latitude is one of the main factors affecting temperature. Latitude is the measurement of the distance of a location on the Earth from the equator. ... At the Equator, the Sun's rays strike the Earth at a right angle, which makes the heat more intense and concentrated over a small area.
Explanation:
As latitude increases, the temperature falls, and vice versa. Generally, around the world, it gets warmer towards the equator and cooler towards the poles.
What is the difference in concentration between a pH of 7 and 12?
Answer:
The pH of a solution is simply a measure of the concentration of hydrogen ions,
H
+
, which you'll often see referred to as hydronium cations,
H
3
O
+
.
More specifically, the pH of the solution is calculated using the negative log base
10
of the concentration of the hydronium cations.
∣
∣
∣
∣
¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯¯
a
a
pH
=
−
log
(
[
H
3
O
+
]
)
a
a
∣
∣
−−−−−−−−−−−−−−−−−−−−−−−−
Now, we use the negative log base
10
because the concentration of hydronium cations is usually significantly smaller than
1
.
As you know, every increase in the value of a log function corresponds to one order of magnitude.
Explanation:
Answer:
ph level of 12 is very high almost bleach but ph level of 7 is about normal.
Explanation:
Can sum1 Help me with my CHEMISTRY!!!!
ANYONE PLEASE!!!!
Answer:
Substance 1 = 1.77 g/mL, corn syrup.
Explanation:
For each substance, find the density and compare to the table given to name the substance. The density is mass divided by volume ( g/mL).
1. 23g/13mL = 1.77g/mL
Let me know if you need more help.
I need the answer really fast !!! Help
Answer:
A
Explanation:
the baking soda and vinegar were products of a chemical reaction
How can one kg of iron melt more ice than 1 kg lead at 100 °C
Answer:
Due to the specific heat capacity of iron, 0.444 J/(g·°C), is more than the specific heat capacity for lead, 0.160 J/(g·°C)
Explanation:
The given parameters are;
The metals provided to melt the ice and their temperature includes;
One kg (1000 g) of iron;
Specific heat capacity = 0.444 J/(g·°C)
Temperature = 100°C
1 kg (1000 g) of lead
Specific heat capacity = 0.160 J/(g·°C)
Temperature = 100°C
Therefore, the heat provided to the ice of mass m, and latent heat of 334 J/g at 0°C by the metals are as follows;
For iron, we have;
ΔQ = Mass × Specific heat capacity × Temperature change
ΔQ[tex]_{iron}[/tex] = Heat obtained from the iron by the ice
ΔQ[tex]_{iron}[/tex] = 0.444 m × 1000 × (100 - 0) = 44400 J
Heat absorbed by the ice for melting, H[tex]_l[/tex] = Heat obtained from the iron
∴ Heat absorbed by the ice for melting, H[tex]_l[/tex] = Mass of ice × Latent heat of ice
H[tex]_l[/tex] = Mass of ice × 334 J/g = 44400 J
Mass of ice melted by the iron = 44400 J/334 (J/g) ≈ 132.9 g
Mass of ice melted by the iron ≈ 132.9 g
For lead, we have;
ΔQ = Mass × Specific heat capacity × Temperature change
ΔQ[tex]_{lead}[/tex] = Heat obtained from the iron by the ice
ΔQ[tex]_{lead}[/tex] = 0.160 m × 1000 × (100 - 0) = 16000 J
Heat absorbed by the ice for melting, H[tex]_l[/tex] = Heat obtained from the iron
∴ Heat absorbed by the ice for melting, H[tex]_l[/tex] = Mass of ice × Latent heat of ice
H[tex]_l[/tex] = Mass of ice × 334 J/g = 16000 J
Mass of ice melted by the lead = 16000 J/334 (J/g) ≈ 47.9 g
Mass of ice melted by the lead ≈ 47.9 g
Therefore, mass of ice melted by the iron, approximately 132.9 g, is more than mass of ice melted by the lead, approximately 47.9 g.
How many atoms are in 32.84 g of B?