The graph below represents the relationship between the distance traveled and time elapsed for an object in motion.
During which interval is the speed of the object changing?
Group of answer choices

BC

DE

Answer: Newtons Second Law states that acceleration is produced when a force acts on a mass. The greater the mass (of the object being accelerated), the greater the amount of force needed to accelerate the object (bullet in our case). Everyone inherently knows that heavier objects require more force to move the same distance as lighter objects.

Explanation:

Answer:

[tex]C_2H_6[/tex]

Explanation:

Hello.

In this case, we can see that the mass of carbon of the unknown compound comes from the yielded mass of carbon dioxide, thus, we compute the moles of carbon as follows:

[tex]m_C=10.2gCO_2*\frac{1molCO_2}{44gCO_2}*\frac{1mol C}{1molCO_2}=0.232 molC[/tex]

Moreover, the mass of hydrogen comes from the yielded water, therefore we can also compute the moles of water:

[tex]m_H=6.3gH_2O*\frac{1molH_2O}{18gH_2O}*\frac{2molH_2}{1molH_2O} =0.7molH[/tex]

Then, to find the subscripts in the empirical formula, we divide by the moles of carbon as the smallest:

[tex]C:\frac{0.232}{0.232}=1\\ \\H:\frac{0.7}{0.232}=3[/tex]

Whose molar mass is:

[tex]M_{CH_3}=12+1*3=15g/mol[/tex]

Thus, the ratio of the molecular formula to the empirical formula is:

[tex]\frac{30}{15}=2[/tex]

Therefore, the molecular formula is twice the empirical formula:

[tex]C_2H_6[/tex]

Which is actually ethane.

Regards.

Answer:

True, abiotic factors are the primary resources.

Answer: The abiotic factor sunlight is the primary source of energy for living organisms.

Explanation: edmentum/plato

Answer: Here is why,

Explanation: Burning of wood is a example of both physical and chemical change. ... Another example is digestion of food ,first the food is chewed into small pieces this is a chemical change while in the actual digestion process it is chemically broken with the help of digestive enzymes and saliva

Answer:true

Explanation:

The neutrons and the protons are what stay there

Answer:

chemically resistant

durable

non-reactive

easy to manufacture

Explanation:

Plastics are polymer materials which can be moulded or shaped into any desired shape when hot. There are two types of plastics; thermoplastics and thermo sets.

Most plastics are easily manufactured. They are light weight materials , chemically stable, durable and do not undergo chemical reactions upon prolonged exposure to the atmosphere.

The study of chemicals is called chemistry.

The correct answer is options B, C, and E

The plastic is made by the carbon by joining with itself by a covalent bond and this property of carbon is known as catenation.

In today's time plastic is used all over the world and it is because of the following reasons.

Hence, the correct answer is B, C, and E.

For more information, refer to the link:-

https://brainly.com/question/25305623

Answer:

69%for the isotope that weighs 62.93 u and

31

%

for the isotope that weighs 64.93 u.

You can approach this problem by using a single equation; let's say the first isotope contributes to the relative atomic mass by a fraction

x

(

x

<

1

). SInce there are only 2 isotopes to consider, the fraction the other isotope contributes with will automatically be

1

−

x

.

Let's set up the equation

x

⋅

62.93

u

+

(

1

−

x

)

⋅

64.93

u

=

63.55

u

Solving this for

x

will produce

64.93

u

−

63.55

u

=

2

x

→

x

=

1.38

2

=

0.69

Multiplying these fractions (0.69 and 1 - 0.69 = 0.31) by 100% percent to get the results as a percentage will give

69

%

for the isotpe that weighs 62.93u and

31

%

for the one that weighs 64.93u.

Answer link

Answer:

Graham's law of effusion was formulated by Scottish physical chemist Thomas Graham in 1848. Graham found experimentally that the rate of effusion of a gas is inversely proportional to the square root of the mass of its particles. This formula can be written as: , where: Rate₁ is the rate of effusion for the first gas.

Explanation:

r1 = rate of effusion for gas 1

r2 = rate of effusion for gas 2

M1 = molar mass of gas 1

M2 = molar mass of gas 2

Answer:

The solution is acidic.

Explanation:

Answer:

At equal concentration of HBCG and BCG^-, the colour is green. This colour first appears at pH = 3.8

Explanation:

HBCG is an indicator that is prepared by dissolving the solid in ethanol.

Since

Ka=[BCG−][H3O+][HBCG]When [BCG-] = [HBCG], then Ka = [H3O+].

If pH = 3.8

Ka= [H3O+] = -antilog pH = -antilog (3.8)

Ka= 1.58 ×10^-4

Answer:

The molar mass of NaOH is 40.00 g/mol.

The number of moles of NaOH is equal to the ratio of its mass to molar mass.

The number of moles of NaOH =

40 g/mol

40 g

​

=1,000 mol

The molarity of NaOH solution is the ratio of number of moles of NaOH to total volume of solution in L.

M=

1 L

1 mol

​

=1 M

Explanation ;)

Answer:

from solar radiation entering the atmosphere

Explanation:

The energy within the greenhouse effect is originated from solar radiation entering the atmosphere, hence option C is correct.

Solar radiation is a broad word for the electromagnetic radiation that the sun emits. It is also sometimes referred to as the solar resource or just sunshine.

A variety of devices can be used to collect solar radiation and transform it into useful forms of energy, such as heat and electricity.

Heat is reflected into the atmosphere from solar energy that has been absorbed in the earth's surface.

Greenhouse gases absorb a large portion of the heat as it travels through the atmosphere and is radiated back into space.

Therefore, the greenhouse effect is powered by solar radiation that reaches the atmosphere.

Learn more about solar radiation, here:

https://brainly.com/question/23338147

#SPJ5

If it loses 2 electrons, the net charge on the atom will be 2. You should first see if the question is already answered next time.

Answer:

D e

Explanation:

Answer:

true

Explanation:

Answer:

I would say the answer is FALSE because the ozone layer is the common term for the high concentration of ozone that is found in the stratosphere between 15 and 30km above the earth's surface. It covers the entire planet and protects life on earth by absorbing harmful ultraviolet-B (UV-B) radiation from the sun. So if the ozone layer is located at the stratosphere then the answer to your question is FALSE. Most atmospheric ozone is concentrated in a layer in the stratosphere, about 9 to 18 miles (15 to 30 km) above the Earth's surface (see the figure below). Ozone is a molecule that contains three oxygen atoms. At any given time, ozone molecules are constantly formed and destroyed in the stratosphere.

Hope this helps, stay safe and have a great day! :)))))

Answer:

The amount of salt solution.

Explanation:

so first you have to think about it as a y = mx + b function, where m and x are constants. So basically the independent variable is represented by the amount of salt solution because the health of the patient is affected by the amount of salt solution. this is how you would write it out as an equation so you can understand it better.

The Health of the patient   = The amount of salt solution + b

Since y depends on the values of m, x, and b, The amount of salt solution would be the independent variable.

Explanation:

hope it helps :)

Answer:

B. technetium

Explanation:

Answer:

Although it is possible to have more than one state, it is also possible to have only one state.

Explanation:

The mistake Dominic made was stating that "although it is possible to have more than one state, it is also possible to have only one state."

Mixtures are impure substances with the following properties:

They have an indefinite composition

Their constituents retains their identities.

Constituents react differently to changed conditions.

They can easily be separated into constituents by physical methods.

There are two types of mixtures based on the number of phases coexisting:

Homogeneous mixtures have their constituents existing in just one phase.

Heterogeneous mixtures exists in at least two different phases.

Explanation:

Answer:

Correct option is ₂⁴He

Explanation:

Uranium-238 undergo alpha decay and produce Th-234 and alpha particle.

₉₂U²³⁸   →   ₉₀Th²³⁴  + ₂He⁴  + energy

Alpha radiations are emitted as a result of radioactive decay. The atom emit the alpha particles consist of two proton and two neutrons. It is also called helium nuclei. When atom undergoes the alpha emission the parent atom converted into the atom having mass number less than 4  and atomic number less than 2 as compared to parent atom.

Properties of alpha radiation:

Alpha radiations can travel in a short distance.

These radiations can not penetrate into the skin or clothes.

These radiations can be harmful for the human if these are inhaled.

These radiations can be stopped by a piece of paper.

Answer:

conduction

Explanation:

The type of heat transfer is Oliver experiencing is Conduction.

Heat transfer takes place in three modes,

1. Conduction

2. Convection

3. Radiation

1. Conduction :

Heat energy is transferred through the mechanism of conduction when nearby atoms or molecules collide. In solids and liquids, where particles are more closely spaced, conduction happens more easily than in gases, where particles are more widely spaced.

2. Convection :

Heat is transferred through convection, which is the large-scale movement of molecules inside gases and liquids, fluid motion is responsible for the bulk of the heat transfer.

3. Radiation :

The energy that emanates from a source and moves through space at the speed of light is referred to as radiation.

When Oliver arrives at the beach to meet his friend Farah, the sand feels hot and burns his bare feet as the heat is trapped in the sand and the heat is transferred to Oliver's feet by Conduction.

To know more about types of heat transfer

https://brainly.com/question/4854124

#SPJ6

Answer:

Describe electrons.

Location: electron cloud

Charge: negative

Mass: one-two thousands amu

Explanation:

Answer:

The answer is 380.

Explanation:

Significant figures:

All non-zero digits are consider significant figures like 1, 2, 3, 4, 5, 6, 7, 8, 9.

Leading zeros are not consider as a significant figures. e.g. 0.06 in this number only one significant figure present which is 6.

Zero between the non zero digits is consider significant like 108 consist of three significant figures.

The zeros at the right side e.g 6300 are also significant. There are four significant figures are present.

How to round the value to three significant figures.

First of all we will place the vertical line after 3rd digit.

379/5

Now we will look at the 4th digit. If it is five or more than five then one is added to 3rd digit. If it is less than five the 3rd digit remain same. In given value 4th digit is 5 thus one is added into 9 and the value become 380.

The answer is 380.

Answer:

[tex]\mathbf{FeCl_3}[/tex] is the lewis acid

[tex]\mathbf{CH_3COCl}[/tex] is the lewis base

Explanation:

The Lewis acid is a compound capable of accepting a doublet of electrons and which has an electronic gap on its valence layer.

The lewis base is a compound capable of donating a doublet of electrons.

A Lewis acid associates with a Lewis base through a covalent bond (sharing of two electrons between two atoms). The reaction between an acid and a Lewis base produces a compound called the Lewis adduct.

We can see the illustration of the diagrammatic expression in the image attached below.

Answer:

Calcium

Explanation:

Periodic table

Answer:

They are called subshells

electron configuration

Answer:

hello your question lacks the required reaction pairs below are the missing pairs

Reaction system 1 :

A + B ⇒ D  [tex]-r_{1A} = 10exp[-8000K/T]C_{A}C_{B}[/tex]

A + B ⇒ U [tex]-r_{2a} = 100exp(-1000K/T)C_{A} ^\frac{1}{2}C_{B} ^\frac{3}{2}[/tex]

Reaction system 2

A + B ⇒ D  [tex]-r_{1A} = 10exp( -1000K/T)C_{A}C_{B}[/tex]

B + D ⇒ U  [tex]-r_{2B} = 10^9exp(-10000 K/T) C_{B}C_{D}[/tex]

Answer : reaction 1 : description of the reactor system : The desired reaction which is the first reaction possess a higher activation energy and higher temperature is required to kickstart reaction 1

condition to maximize selectivity : To maximize selectivity the concentration of reaction 1 should be higher than that of reaction 2

reaction 2 :

description of reactor system : The desired reaction i.e. reaction 1 has a lower activation energy and lower temperatures is required to kickstart reaction 1

condition to maximize selectivity:

to increase selectivity the concentration of D should be minimal

Explanation:

Reaction system 1 :

A + B ⇒ D  [tex]-r_{1A} = 10exp[-8000K/T]C_{A}C_{B}[/tex]

A + B ⇒ U [tex]-r_{2a} = 100exp(-1000K/T)C_{A} ^\frac{1}{2}C_{B} ^\frac{3}{2}[/tex]

the selectivity of D is represented  using the relationship below

[tex]S_{DU} = \frac{-r1A}{-r2A}[/tex]

hence SDu = 1/10 * [tex]\frac{exp(-800K/T)}{exp(-1000K/T)} * C_{A} ^{0.5} C_{B} ^{-0.5}[/tex]

description of the reactor system : The desired reaction which is the first reaction possess a higher activation energy and higher temperature is required to kickstart reaction 1

condition to maximize selectivity : To maximize selectivity the concentration of reaction 1 should be higher than that of reaction 2

Reaction system 2

A + B ⇒ D  [tex]-r_{1A} = 10exp( -1000K/T)C_{A}C_{B}[/tex]

B + D ⇒ U  [tex]-r_{2B} = 10^9exp(-10000 K/T) C_{B}C_{D}[/tex]

selectivity of D

[tex]S_{DU} = \frac{-r1A}{-r2A}[/tex]

hence Sdu = [tex]1/10^7 * \frac{exp(-1000K/T)}{exp(-10000K/T)} *\frac{C_{A} }{C_{D} }[/tex]

description of reactor system : The desired reaction i.e. reaction 1 has a lower activation energy and lower temperatures is required to kickstart reaction 1

condition to maximize selectivity:

to increase selectivity the concentration of D should be minimal

Answer:

C.Thermal energy will move from the ice to the air.

Explanation: