i need help with this

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

Answer:

b

Explanation:

Answer:

by increasing pressure

Explanation:

volume is inversely proportional to pressure at constant temperature

Answer:

d. Increasing the pressure.

Explanation:

Boyle's law state that P*  V is constant at a given temperature.

So to reduce the volume you would increase the pressure.

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.

Answer:

What do you need help with

Explanation:

Plasma forms when atoms break down to form free protons and electrons (option 4)

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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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:

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The rate of reaction with those concentrations is 0.4 M/time.

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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Answer:

alpha

Explanation:

Answer:A linear pattern is a continuous decrease or increase in numbers over time. On a graph, this data appears as a straight line angled diagonally up or down (the angle may be steep or shallow). So the trend either can be upward or downward.

Explanation:

Graphs are the diagrammatic representation of the data. The constructed graph gives the upward or downward trends in the data over the respective trends.

The graphs can be distinguished based on the type of data representation technique used.

The graphs can be line, pie, bar, etc. The data plotted in the graph shows the trends with the angle of the line and the slope. The increasing slope tends to interpret the increasing trend, and vice versa.

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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.

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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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.

Answer:

See explaination

Explanation:

Please kindly check attachment for the step by step solution of the given problem.

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.

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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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.

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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Answer:

the answer is Fe + 02 - Fe203

Explanation:

Answer:

B

Explanation:

Correct on edge

Answer:

D. Incinerating or incineration

Explanation:

Burning trash to reduce the amount of waste on land is called incineration.

Answer:

C) Hide from predators

Explanation:

The smoke would allow the peppered moths to be more visible

Therefore, they evolved into dark-peppered moths to be able to hide from those predators.

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.

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 .

Answer: The original mass of the sample of Uranium-235 is 0.7308 mg

Explanation:

Expression for rate law for first order kinetics is given by:

[tex]t=\frac{2.303}{k}\log\frac{a}{a-x}[/tex]

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process  

a) for calculating rate constant

[tex]t_{\frac{1}{2}}=\frac{0.693}{k}[/tex]

[tex]k=\frac{0.693}{7.0\times 10^8years}=0.099\times 10^{-8}years^{-1}[/tex]

b) for time of [tex]2.8\times 10^9[/tex] years

[tex]2.8\times 10^9=\frac{2.303}{0.099\times 10^{-8}}\log\frac{a}{0.04625}[/tex]

[tex]\log\frac{a}{0.04625}=1.2[/tex]

[tex]\frac{a}{0.04625}=15.8[/tex]

[tex]a=0.7308mg[/tex]

The original mass of the sample of Uranium-235 is 0.7308 mg

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.

Answer:

Othere was steam coming off the water in the beaker.

Answer:

1.Electrical energy

2. Toaster

3. Music heard from a radio

Answer:

Yes

Explanation:

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.

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

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.

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.

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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