Answer:
The charge of an electron is negative.
The charge of a proton is positive.
A neutron does not have a charge.
Answer:
Negative
Explanation:
PROtons have POSITIVE charges, electrons have negative charges
did the microscope revolutionize surgery
Answer:
Yes
Explanation:
Which type of radioactive decay produces
particles with the most mass?
Alpha
Beta
Gamma
Answer:
alpha
Explanation:
State of Matter Chemistry TEST
The temperature of the water started rising only when:
Othere was steam coming off the water in the beaker.
Othere was only water in the beaker.
theres was ice mixed with the water in the beaker.
Answer:
Othere was steam coming off the water in the beaker.
5. The image above represents a cell going
through meiosis. How do you know the
image does not represent mitosis?
A Mitosis only has one cell division set.
B Mitosis only occurs in
reproductive
cells, such as the ones in the picture.
C Mitosis is involved in the production of
haploid sex cells.
D Mitosis divides cells into eight cells, not
four.
Answer:
The correct answer is option A, that is, mitosis only has one cell division set.
Explanation:
The two kinds of nuclear division that takes place at the time of cell differentiation are meiosis and mitosis. In the process of mitosis, the cells of the body get divide, while in meiosis the sex cells are differentiated.
While going through the process of mitosis, the cell divides only one time, on the other hand, during meiosis a cell divides two times. After going through mitosis production of two diploid daughter cells takes place, while after going through meiosis generation of four haploid daughter cells takes place. Thus, it is clear from the diagram that the process of meiosis is taking place, as the formation of four haploid cells is taking place as the cell is dividing two times.
What is the molality of a solution made by dissolving 2 moles of NaOH in 10
kg of water?
A. 0.5 mol/kg
B. 0.2 mol/kg
c. 5 mol/kg
D. 2 mol/kg
Answer:
b
Explanation:
Which of these is an oxidation half-reaction?
0 V3+ + e + V2+
1 Fe + 02 - Fe203
o c4+ + 2e → C2+
Answer:
the answer is Fe + 02 - Fe203
Explanation:
Answer:
B
Explanation:
Correct on edge
Calculate the frequency of green light if it has a wavelength of 5.30 x 10'm.
Plz
Answer:
c = wavelength * frequency
Therefore, to find frequency you must divide c (the speed of light, 3 x 10^8 m/s) by the wavelength.
Explanation:
Among electromagnetic waves, UV rays are most dangerous because exposure to these radiation cause serious problems in living organism. The frequency of light is 0.00056 s⁻¹.
What is electromagnetic wave?Electromagnetic wave is a wave which contain two component one is electric component and other is magnetic component. The electric and magnetic component are perpendicular to each other. There are so many wave that comes under electromagnetic wave like infrared wave , radio wave, light wave.
There is a relation between frequency of wave, and wavelength of wave
Mathematically,
ν =c÷λ
where,
ν =frequency of light =?
c is speed of light that is 3×10⁸m/s
λ is the wavelength of light=5.30x10¹¹m
Substituting all the values
ν =3×10⁸m/s÷5.30x10¹¹m
ν = 0.00056 s⁻¹
Thus the frequency of light is 0.00056 s⁻¹.
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The half-life of Cs-137 is 30.2 years. If the initial mass of the sample is 5.00 kg, how much will remain after 90.6 years?
Answer:
0.625 kg
Explanation:
Since 90.6 is 3 half-lives from 30.2 (90.6/30.2 = 3) , divide the initial mass of the sample by 2, and divide that quotient by 2, and divide THAT quotient by 2 to determine how much remains after 3 half-lives.
The mass will remain at 1.6 kg.
How to find the mass after 90.6 years?Mass after t years:
The mass of the elements after t years is given by the following equation:
M(t) = M(0)(1-r)[tex]^{t}[/tex]
The half-life of Cs-137 is 30.2 years.
This means that:
M (30.2) = 0.5 M (0)
M (t) = M (0)(0.9773)[tex]^{t}[/tex]
If the initial mass of the sample is 5 kg, how much will remain after 90.6 years?This is M(151), with M(0) = 100.
Then,
M(90.6) = 5(0.9773)[tex]^{90.6}[/tex]
= 5*0.24
= 1.2 kg
Cesium-137 emits beta particles as it decays to the barium isotope, Ba-137m.
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10. Burning trash to reduce the amount thrown in landfills is called -
recycling
composting
refuse
incinerating
Answer:
D. Incinerating or incineration
Explanation:
Burning trash to reduce the amount of waste on land is called incineration.
In this experiment, you will measure all masses in
kilograms. Convert the book's mass to kilograms.
Answer:
0.498 kg
Explanation:
Answer:
The first answer is 498
The second answer is 0.498
Explanation:
At the extreme temperatures within the Sun, hydrogen forms plasma. Plasma forms when:
1. atoms join together in chemical reactions
2. protons and electrons fuse together
3. protons fuse together, releasing heat and light
4. atoms break down to form free protons and electrons
If you could please let me know which option would be the answer to the question, it would be great!
Answer:
What do you need help with
Explanation:
Plasma forms when atoms break down to form free protons and electrons (option 4)
What is plasma?Plasma is the fourth state of matter, after solids, liquids, and gases. It is characterized by the presence of a significant portion of charged particles in any combination of ions or electrons.
It is the most abundant form of ordinary matter in the universe, mostly in stars (including the Sun), but also dominating the rarefied intracluster medium and intergalactic medium. Plasma can be artificially generated by heating a neutral gas or subjecting it to a strong electromagnetic field.
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What is the molarity of a sodium hydroxide solution if 24 mL of the solution
is titrated to the end point with 12 mL of 0.50M sulfuric acid? (Remember:
MaVa = MbVb)
•0.10M
•0.25M
•0.50M
•0.75M
Answer:
Option 3. 0.50M
Explanation:
Step 1 :
We'll begin by writing the balanced equation for the reaction. This is given below:
2NaOH + H2SO4 —> Na2SO4 + 2H2O
From the above equation, we obtained the following:
Mole ratio of the acid (nA) = 1
Mole ratio of the base (nB) = 2
Step 2:
Data obtained from the question. This includes the following:
Molarity of base (Mb) =?
Volume of base (Vb) = 24 mL
Volume of acid (Va) = 12 mL
Molarity of acid (Ma) = 0.50M
Step 3:
Determination of the molarity of the base.
The molarity of the base can be obtained by applying the following equation:
MaVa/MbVb = nA/nB
0.5 x 12/Mb x 24 = 1/2
Cross multiply to express in linear form
Mb x 24 = 0.5 x 12 x 2
Divide both side by 24
Mb = (0.5 x 12 x 2) /24
Mb = 0.5 M
Therefore, the molarity of NaOH is 0.5 M
Hydrogen reacts with oxygen to produce water.
2H2(g) + O2(g) → 2H20(1)
The mass of oxygen before and after the reaction
A.
varies with the experimental conditions
B.
is always the same.
C.
is sometimes same and sometimes different.
D.
is always different.
Using your knowledge of wave characteristics and energy conversions, explain how musicians create, record, store, and replay analog sounds.
Answer:
In creating music, sound waves from the singer in the form of vibrational energy strikes and is converted into electrical signals in the microphone.
These electrical signals are converted to a magnetic field and then stored on an analogue recorder in the form of magnetic domains.
When the song is replayed, these magnetic domains create a changing magnetic field which produces electrical signal.
The electrical signal is sent to the voice coil in the speaker, where it is converted to a magnetic field.
The changing magnetic field pulls and push on the diaphragm which sets the air around it into vibration.
This vibration becomes sound wave that strikes our ears when we listen to these sounds.
Which change increases the electric force between objects?
O
Two neutral objects are moved closer together.
Electrons are added to two negatively charged objects.
Two oppositely charged objects are moved farther apart.
The charge on two positively charged objects is reduced.
O
O
Answer:
Electrons are added to two negatively charged objects.
Explanation:
Two negatively charged objects repel each other.
If electrons are added to two already negatively charged objects, they wil become even more negatively charged, which increases the electric force between the objects.
The electric force between objects can be increased when electrons are added to two negatively charged objects. Therefore, option B is correct.
What is electric force?The electric force is the attraction or repulsion between electrically charged objects. The force is created by the presence of charged particles, such as electrons or protons. It is described by Coulomb's law.
Like charges repel each other, while opposite charges attract each other. The strength of the electric force depends on the amount of charge on the objects and the distance between them. The force increases as the amount of charge increases and as the distance between the objects decreases.
Electric force is a fundamental force in nature. It plays an important role in many physical phenomena, such as electricity and magnetism. Therefore, option B is correct.
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Disturbed soil is when top soil and subsoil are mixed.
O
True
U
False
Answer:
true
Explanation:
The A horizon, known as the topsoil, is essential for plant production due to its rich organic content, while the B horizon, or subsoil, is denser and stores inorganic nutrients.
Explanation:Topsoil is considered the A horizon, consisting of partially decayed organic matter that enhances soil moisture retention, while the Subsoil is the B horizon, a dense layer with inorganic nutrients accumulation.
In understanding soil composition and structure, it's crucial to identify the different layers or horizons that make up the soil profile. The topsoil is referred to as the A horizon, which is the layer where the soil possesses a mixture of organic material and inorganic products of weathering. This horizon is typically dark due to the presence of organic matter, making it highly crucial for plant production as it retains water and facilitates oxygen diffusion necessary for root respiration. Below the topsoil lies the subsoil, known as the B horizon. This layer accumulates mostly fine material that has been translocated downwards from the A horizon, making it denser. The subsoil is critical for the storage of inorganic nutrients but is lighter in color and has fewer organic materials compared to the topsoil.
All living organisms are part of their environment which is composed of biotic and abiotic factors that interact with each other. The interaction of living organisms with its environment are vital to the organisms survial. What is this interaction called?
Answer:
Ecology
Explanation:
Final answer:
The term for the interaction between living organisms and their environment, involving biotic and abiotic factors, is ecology. An ecosystem is the result of this interaction, including processes like respiration and photosynthesis that exemplify the interdependence of biotic and abiotic components.
Explanation:
The interaction between living organisms and their environment, which includes both biotic and abiotic factors, is a fundamental aspect of biology and is referred to as ecology. Biotic factors are the living parts of the environment, while abiotic factors include the nonliving components such as temperature, water, soil, and air. The complex system formed by the interplay of these factors is known as an ecosystem. Within an ecosystem, living organisms carry out processes like respiration and photosynthesis that influence the abiotic conditions, while the physical processes in the environment can affect the behavior and the very existence of living organisms.
For example, plants, as biotic factors, require abiotic components like sunlight, water, and carbon dioxide to perform photosynthesis. This process not only enables plants to produce their own food but also contributes oxygen to the environment, benefiting other organisms. Another interaction would be animals breathing in oxygen (an abiotic factor) and exhaling carbon dioxide, which is then used by plants. These exchanges illustrate the interdependence of biotic and abiotic factors and the cyclical nature of ecosystem function.
Select the phrase that completes each statement.
Honey is
Grape juice is
Sand on the beach is
• A mixture of carbon dioxide and nitrogen
gases is
•
Rubbing alcohol is
Answer:
1) A mixture and a solution.
2) A mixture and a solution.
3) A mixture but not a solution.
4) A mixture and a solution.
5) A mixture and a solution.
Explanation:
Honey, grape juice, a mixture of carbon dioxide and nitrogen gases, and rubbing alcohol are homogeneous mixtures, while sand on the beach is a heterogeneous mixture.
To complete the statements accurately, let's classify each substance:
Honey is a homogeneous mixture (solution) - It is a uniform mixture of water, sugars, and other compounds.
Grape juice is a homogeneous mixture (solution) - It contains water, sugars, acids, and other dissolved compounds that appear uniform throughout.
Sand on the beach is a heterogeneous mixture - It consists of different particles such as quartz, shells, and organic matter that are not uniform throughout.
A mixture of carbon dioxide and nitrogen gases is a homogeneous mixture (solution) - It forms a uniform gaseous mixture.
Rubbing alcohol is a homogeneous mixture (solution) - It is typically a mixture of isopropanol and water, appearing uniform throughout.
A 2 cm cube made of acrylic has a mass of 19.7 g . What is the density of the acrylic?
Answer:
9.85g/cm³
Explanation:
Mass = 19.7g
Volume = 2cm³
Density (ρ) = mass (m) of a substance / volume (v) it occupies
ρ = mass / volume
ρ = 19.7 / 2
ρ = 9.85g/cm³
Answer:
9.85g/cm3
Explanation:
The following data were obtained from the question:
Mass = 19.7g
Volume = 2cm3
Density =..?
Density of a substance is simply defined as the mass per unit volume. It is represented mathematically by:
Density = Mass /volume
With the above formula we can find the density of the acrylic as follow:
Density = 19.7g/2cm3
Density = 9.85g/cm3
Explain why floods, hurricanes, and tornadoes are aspects of weather, not climate.
Answer:
Floods, hurricanes, and tornadoes are all aspects of weather and not climate because climate is more related to temperature. The definition of climate is "the weather conditions prevailing in an area in general or over a long period." Floods, hurricanes, and tornadoes are not aspects of climate, they are aspects of weather.
Explanation:
Floods, hurricanes, and tornadoes are considered weather events due to their immediate and short-term nature, while climate refers to the long-term average weather patterns in a region. Weather involves day-to-day atmospheric conditions, leading to various forms of severe weather, whereas climate encompasses the general weather trends and conditions over a prolonged period.
Floods, hurricanes, and tornadoes are categorized as aspects of weather rather than climate due to their short-term occurrence and direct impact on specific regions over a brief period. Weather involves immediate atmospheric conditions, such as precipitation, wind speeds, and temperature, which can lead to the development of these extreme weather events. In contrast, climate describes the average weather conditions in a particular area over a long period, typically years or decades, encompassing patterns and trends rather than individual or short-term events. For instance, the differential heating of the Earth's surface by the Sun, which significantly influences weather patterns, can lead to the formation of severe weather phenomena like tornadoes, characterized by their funnel-shaped clouds and powerful winds, and hurricanes, known for their high winds and heavy rains forming over warm ocean waters.
The distinction between weather and climate is crucial for understanding how external forces like the Sun's heating influence Earth's atmospheric conditions, leading to immediate weather conditions and longer-term climatic trends. While floods, hurricanes, and tornadoes manifest as a result of these conditions, representing the variability and extremity of weather, climate refers to the broader, more consistent patterns that define a region's average atmospheric conditions over time.
What is the molarity of a sodium hydroxide solution made by combining 2.0 L of 0.60 M NaOH with 495 mL of 3.0 M NaOH?
Assume the volumes of the two solutions to be additive.
Answer:
1.1 M
Explanation:
I git it wrong and it gave me the answer
The molarity of the final solution i.e. sodium hydroxide solution at the time of combining should be 1.1.
Calculation of the molarity:Since
Molarity (M1) = 0.60 M
Volume ( V1) = 2.0 L
Molarity ( M2 ) = 3.0 M
Volume ( V2) = 495 ml = 0.495 L
We know that
Moles = Molarity * volume in L
Now
Moles of 1st solution = n1 = M1 * V1
So
n1 = 0.60 * 2.0 = 1.2 mol
Now
Moles of 2nd solution = n2 = M2 * V2
So, n2 = 3 * 0.495 = 1.485 mol
Now
Total moles in final solution = n = n1 + n2
So,
n = 1.2 + 1.485 = 2.685 mol
Now
Total volume is
= V = V1 + V2
= 2.0 +0.495
= 2.495 L
Now
Molarity of final solution = n / V
= 2.685 / 2.495
= 1.0761 M
= 1.1
hence, The molarity of the final solution is 1.1.
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14. How many grams of NaCl are contained in 0.350 kg of a
0.238 m solution of sodium chloride?
83.3 g
0
4.87 g
4.87 g
O
13.9 g
o
1.43 g
Answer:
4.87g
Explanation:
Step 1:
Data obtained from the question. This includes the following:
Mass of solution = 0.35kg
Molality = 0.238 m
Mass of NaCl =..?
Step 2:
Determination of the number of mole of NaCl in the solution.
Molality of a solution is simply defined as the mole of solute per unit kg of the solvent. It is given as:
Molality = mol of solute /mass of solvent (kg)
With the above formula, we calculate the mole of NaCl present in the solution as follow:
Molality = mol of solute /mass of solvent (kg)
0.238 = mol of NaCl /0.35
Cross multiply
mol of NaCl = 0.238 x 0.35
mol of NaCl = 0.0833 mol
Step 3:
Determination of the mass of NaCl in 0.0833 mol of NaCl.
This is illustrated below:
Number of mole NaCl = 0.0833 mol
Molar Mass of NaCl = 23 + 35.5 = 58.5g/mol
Mass of NaCl =..?
Mass = number of mole x molar Mass
Mass of NaCl = 0.0833 x 58.5
Mass of NaCl = 4.87g
Therefore, 4.87g of NaCl is contained in the solution.
What is the rate of a reaction if the values are
k=0.1
a=1 M
b=2 M
rate=k(a)^2(b)^2
Answer:
Explanation:
Hi there,
To get started, let's first observe our rate law:
[tex]R=k[A]^2[B]^2[/tex] we typically use square brackets [x] for chemistry kinetics, because they specifically tell us we are dealing with concentrations.
This rate law is in fourth-order, because the concentrations powers add up to 4. We are not told the unit of time for this prompt (unless you know it), so I just assumed the time unit to be "time."
To calculate the reaction rate, we simply plug in the concentration of A and B into the rate law. k is the rate constant and stays the same for an individual reaction.
[tex]R=(0.1 \ M^{-3}*time^{-1})[1 \ M]^2[2 \ M]^2=0.4 \ M/time[/tex]
Thus, the rate of reaction with those concentrations is 0.4 M/time.
Notice, the rate constant does in fact have units of it own. The unit for k can be calculated by knowing that:
Rate (R) must end up with units of concentration (M) per time. The concentrations raised to a power can be used to help solve for the units of k.If you liked this solution, leave it as Brainliest Answer and give a Rating!
The rate of reaction with those concentrations is 0.4 M/time.
What is the rate of a reaction?The reaction rate is said to be the decrease in the concentration of the reactant or the increase in the concentration of the product per unit of time. Reaction rate measures how fast the reactant is used up or how fast the product is formed.
For a given reaction like
[tex]Mg(s) + O_2(g)[/tex] → [tex]2MgO(aq)[/tex]
The reaction rate is derived by measuring how fast the concentration of Mg and [tex]O_2[/tex] decreases or how fast the concentration of MgO increases. Mathematically reaction rate can be expressed as
Reaction rate = Δconcentration/ ΔTime
Rate=[tex]k(a)^2(b)^2[/tex] We typically use square brackets [x] for chemistry kinetics, because they specifically tell us we are dealing with concentrations.
This rate law is in fourth-order because the concentration powers add up to 4. We are not told the unit of time for this prompt (unless you know it), so I just assumed the time unit to be "time."
To calculate the reaction rate, we simply plug the concentration of A and B into the rate law. k is the rate constant and stays the same for an individual reaction.
Thus, the rate of reaction with those concentrations is 0.4 M/time.
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You have a 5.0 L balloon that you bought in Denver(0.85 atm). If you take
that balloon back to sea level, where the pressure is 1.0 atm, what will the
new volume of the balloon be?
Answer:
New volume of the balloon at sea level (V1) = 4.25 L
Explanation:
Given:
Present volume (V) = 5 L
Present pressure (P) = 0.85 atm
Pressure at sea level (P1) = 1 atm
Find:
New volume of the balloon at sea level (V1) = ?
Computation:
According to Boyles law:
⇒ P × V = P1 × V1
⇒ 0.85 × 5 = 1 × V1
⇒ 4.25 L = V1
New volume of the balloon at sea level (V1) = 4.25 L
What is significant about the temperature -40°C?
O
A. It's the boiling point of mercury.
O
B. It's the temperature at which Kelvin and Celsius thermometers
read the same.
O
C. It's the temperature at which Fahrenheit and Celsius
thermometers read the same.
O
D. It's absolute zero.
Answer: c
Explanation: it is the temperature at which Fahrenheit and Celsius read the same
It's the temperature at which Fahrenheit and Celsius thermometers read the same exists significant about the temperature -40°C.
What is the significance of temperature?One of the most pervasive and significant physical elements in an organism's environment is temperature. It is a gauge for the typical speed of atoms and molecules moving at random; the higher the temperature, the faster the motion.
Because temperature affects the physical state of water, it has the greatest impact on how organisms are distributed. Most organisms cannot survive in environments where the temperature is consistently below 0°C or above 45°C.
Since there are 100 units between the freezing (0°C) and boiling (100°C) points of water, the Celsius scale is a centigrade scale. The majority of the world uses this temperature scale, which is also the recognized unit of measurement in science.
It's the temperature at which Fahrenheit and Celsius thermometers read the same exists significant about the temperature -40°C.
Therefore, the correct answer is option C. It's the temperature at which Fahrenheit and Celsius thermometers read the same.
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1.
What is light energy converted from in the bulb of a lamp?
electric energy
sound energy
heat energy
2.
Which is the best example of an object that converts electric energy to heat energy?
lamp
toaster
radio
3.
Which is evidence of electric energy converted to sound energy?
music heard from a radio
a song played on a piano
applause from an audience
Answer:
1.Electrical energy
2. Toaster
3. Music heard from a radio
to prepare 100 mL of a 0.5 M solution of CuSO4 using water as the solvent. Calculate the amount of solid needed.
Answer:
Explanation:
100 mL of a .5 M solution
= 0.1 L of .5 M solution
This solution will contain .1 x .5 mole of solute
= .05 mole of solute
molecular weight of CuSO₄
= 63.5 + 32 + 64
= 159.5 gm
one mole of CuSO₄ = 159.5 gm
.05 mole = 159.5 x .05 gm
= 7.975 gm
7.975 gm of CuSO₄ will be required .
On top of Mt. Yale in Colorado (elevation 14,202 feet), you step on a scale and weigh 183 pounds, using the same scale in New Orleans (elevation 4 feet) you would weigh ?
A. More than on top of Mt. Yale
B. Less than on top of Mt. Yale
C. The same as on top of Mt. Yale
Please help.. an explanation would really help as well..
On top of Mt. Yale in Colorado (elevation 14,202 feet), you step on a scale and weigh 183 pounds, using the same scale in New Orleans (elevation 4 feet) you would weigh more than on top of Mt. Yale.
Hence, option A is correct.
What are pounds?Pound, unit of avoirdupois weight, equal to 16 ounces, 7,000 grains, or 0.45359237 kg, and of troy and apothecaries' weight, equal to 12 ounces, 5,760 grains, or 0.3732417216 kg. The Roman ancestor of the modern pound, the libra, is the source of the abbreviation lb.
183 is to 14202 as x is to 4
183/14202 = x/4
14202x = 183(4)
x = 183(4)/14202
x = 0.0515 pounds
Hence, option A is correct.
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Two students have two plastic magnets and a cup of paper clips on their table. Student A tries to pick up a paper clip from the table while holding one magnet 10cm above the paper clip. Student B tries to pick up a different paper clip from the table while holding the other magnet 1 cm above the paper clip. What are two questions you would ask to determine which student could pick up the most paper clips?
What factors do you think will determine how many paper clips each student is able to pick up?
Answer: How far did you hold the magnet from the paper clip. How heavy is each paper clip.
Explanation: Close= Stronger Magnetism, just because he has more and is closer doesn't make his stronger than the other students. Weight also changes this.
Hope this helps.
Which of the following factors would negatively impair the water quality in a watershed? I. irresponsible use of industrial chemicals II. increase of the amounts of fertilizers and pesticides used on farmlands III. decrease in sewage discharge into lakes and rivers
II and III only
I, II, and III
I and II only
I only
Answer:
1 and 2 only
Explanation: These will make a bad impact on water.