Someone can help me please??

Answers

Answer 1

Answer:

c-d

Explanation:

this is a section of the graph sloping down, meaning the state of matter isn't changing but is getting ready too (the actually changing of states happens in the flat sections). A-B is the gas cooling, b-c is the gas changing into liquid, which leads to the liquid cooling in the next section

Related Questions

What happens to the pitch of a sound if the frequency is high?

Answers

The higher the frequency wave the higher the pitch of sound we hear

Which option describes a wavelength of light?

A. a distance between two similar points on a wave of light

B. an object that makes light bend or bounce

C. a type of visible light

D. a heated atom that forms light

Answers

Answer:

Its A

Explanation:

It you look at a wavelength chart, it would show you the rate at which the light travels, from its distance. Which means there has to be two points to calculate it.

A farmer digs a small pond in a pasture. The farmer adds young individuals from two species of
algae-eating fish to the ponds and plants some reeds around the edge of the pond. The farmer wants
the pond to be a sustainable ecosystem.
Which of the following would be most helpful in increasing the pond ecosystem’s sustainability?
a. Decreasing the number of plant species around the edge of the pond
b. Introducing older fish of the same species into the population of algae-eating fish
c. Having a greater diversity of living organisms in the pond
d. Adding gravel between the water and where the reeds are planted

Answers

If the farmer wants the pond to be more sustainable, he has to have a greater diversity of living organisms in the pond.

What is an ecosystem?

The term ecosystem means a self supporting unit in which there is an exchange of materials and energy. The ecosystem is expected to be self sustaining.

When the farmer adds young individuals from two species of algae-eating fish to the ponds and plants some reeds around the edge of the pond, if the farmer wants the pond to be more sustainable , he has to have a greater diversity of living organisms in the pond.

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Answer: Having a greater diversity of living organisms in the pond

Explanation:

STAAR, Plato, proof below

An inhibitor is added to an enzyme-catalyzed reaction at a concentration of 26.7 μM. The Vmax remains constant at 50.0 μM/s, but the KM increases by 150%. Calculate the Ki for this inhibitor.

Answers

Using the Michaelis-Menten equation competitive inhibition, the Inhibition constant, Ki of the inhibitor is 53.4 μM.

What is the Ki for the inhibitor?

The Ki of an inhibitor is known as the inhibition constant.

The inhibition is a competitive inhibition as the Vmax is unchanged but Km changes.

Using the Michaelis-Menten equation for inhibition:

Kma = Km/(1 + [I]/Ki)

Making Ki subject of the formula:

Ki = [I]/{(Kma/Km) - 1}

where:

Kma is the apparent Km due to inhibitor Km is the Km of the enzyme-catalyzed reaction[I] is the concentration of the inhibitor

Solving for Ki:

where

[I] = 26.7 μM

Km = 1.0

Kma = (150% × 1 ) + 1 = 2.5

Ki = 26.7 μM/{(2.5/1) - 1)

Ki = 53.4 μM

Therefore, the Inhibition constant, Ki of the inhibitor is 53.4 μM.

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What is the mechanism of a chemical reaction? How can a study of reaction rates be used to elucidate
the mechanism of a chemical reaction?

Answers

The mechanism of chemical reaction is the series of steps

by which chemical reaction follows to for a new substances.

Mechanism of chemical reaction

For a new substance to evolve from a chemical reaction, there are some steps that needs to be taken. These steps include:

Bonds between atoms in the reactants must be broken,

The atoms or pieces of molecules are reassembled into products by forming new bonds.

Energy is absorbed to break bonds, and

Energy is evolved as bonds are made.

The study of reaction rate, which is the change in concentration of a reactant or product with time, helps to explain further the mechanism of chemical reaction.

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Use the reactivity series to name two metals that are more reactive than magnesium, and three metals that are less reactive.

Answers

Answer:

More reactive - Sodium and potassium

Less reactive - Aluminum, Manganese and Zinc

Answer:

Two more reactive metals= K and Na Three less reactive metals = Al , Zn and Fe

Explanation:

Here we need to state two metals that are more reactive than Magnesium and three metals which are less reactive than Magnesium using the Reactivity series .

The Reactivity series goes like ,

K > Na > Ca > Mg > Al > Zn > Fe > Ni > Sb > Pb > H > Cu > Hg > Ag > Au > Pt

So from this we see that , Pottasium (K) , Sodium (Na) and Calcium (Ca) are more reactive than Magnesium and Aluminium (Al) , Zinc (Zn) and Iron (Fe) are less reactive than Magnesium .

So that ,

→ Two more reactive metals= K and Na

→ Three less reactive metals = Al , Zn and Fe

I hope this helps .

How many atoms are in 1mg of NaCl

Answers

The number of atoms in 1 mg of NaCl = 1 × 10^19 atoms

Calculation of quantity of atoms

Atomic mass of Na = 23

Atomic mass of Cl = 35.5

Therefore the molar mass of NaCl = 23 + 35.5 = 58.5g/mol

But 1 mg = 0.001g and 1 mol = 6.022 × 10^ 23

Therefore, If = 58.5g = 6.022 × 10^ 23 atoms

0.001g =X atoms

X atoms = 6.022 × 10^23 × 0.001/58.5

= 0.1 × 10^23 × 10^-³

= 1 × 10^19 atoms

Therefore, the number of atoms in 1 mg of NaCl =1 × 10^19 atoms.

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use the periodic table to answer this question, state whether the element named in (a)is a metal or nonmetal

Answers

Answer:

METAL

Explanation:

Element Name - Actinium

Symbol - AC

Electronegativity - 1.1

It is a Rare Silvery- white metal that's highly radio active

The vapor pressure of pure acetone (C3H6O) is 216 torr

The vapor pressure of pure chloroform (CHCl3) is 157 torr.

What is the mole fraction of acetone (C3H6O) in the vapor phase resulting from a solution of 0.100 mol acetone and 0.200 mol chloroform (CHCl3) in the liquid phase?

Answers

The mole fraction of acetone (C₃H₆O) is 0.333

Data obtained from the question Mole of C₃H₆O = 0.1 moleMole of CHCl₃ = 0.2 mole Mole fraction of C₃H₆O =?

How to determine the mole fraction

Mole fraction of a substance can be obtained by using the following formula:

Mole fraction = mole / total mole

With the above formula, we can obtain the mole fraction of C₃H₆O as follow:

Mole of C₃H₆O = 0.1 moleMole of CHCl₃ = 0.2 mole Total mole = 0.1 + 0.2 = 0.3 moleMole fraction of C₃H₆O =?

Mole fraction = mole / total mole

Mole fraction of C₃H₆O = 0.1 / 0.3

Mole fraction of C₃H₆O = 0.333

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How to polymers work?

Answers

Answer:

A polymer is any of a class of natural or synthetic substances composed of very large molecules, called macromolecules, which are multiples of simpler chemical units. Polymers make up many of the materials in living organisms and are the basis of many minerals.

Explanation:

The first man-made polymers were actually modified versions of these natural polymers. Celluloid, the stuff from which silent-movie film was made, was a plastic created from chemically modified cellulose. The first completely synthetic polymer (that is, made by people through chemical synthesis), invented in the early years of the twentieth century, was Bakelite: a plastic made by reacting phenol and formaldehyde under pressure at high temperatures.

# be careful #

A chemist measures the amount of bromine liquid produced during an experiment. He finds that 5.9 g of bromine liquid is produced. Calculate the number of moles of bromine liquid produced. Be sure your answer has the correct number of significant digits. 0.03mol

Answers

Answer:

below•

Explanation:

6.1 g total?

I don't really know alot about Chemistry

Which is a derived unit?

Answers

Answer:

derived unit. noun. a unit of measurement obtained by multiplication or division of the base units of a system without the introduction of numerical factors.

Explanation:

June 1
June 8
June 11
5. What phase of the moon most likely will appear 28 days after phase C?
A Waning Gibbous
June 15
B
Waning Crescent
с
Waxing Crescent
D
Waxing Gibbous

Answers

Answer:

Explanation:

it's D because it goes waxing crescent to waxing gibbous

Describe the Principle of Continuity of State

Answers

If any liquid is flowing in a pipe of cross-section area, then rate of flow of liquid across any cross-section remains constant.

Principle of Continuity of State

According to the equation of continuity states that if any liquid is flowing in streamline flow in a pipe of non-uniform cross-section area, then rate of flow of liquid across any cross-section remains constant. In the Principle of Continuity of State, Av = constant.

Where A refers to cross-sectional area and v is the velocity in which the fluid flows. It means

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3. Calculate the mass of
(6) 0.5 mole of magnesium atoms.
(a) 3 moles of chlorine molecules.

Answers

Hope you could understand.

If you have any query, feel free to ask.

Calculate the value of K at 700 K for the
reaction
H2(g) + I2(g) → 2 HI(g)
if Kc = 54 at the same temperature.

Answers

Answer:

It going to be 54

Explanation:

I got it right but I would say it's because the temperature stays the same. So the K value stays the same.

Process by which plants, algae, and many types of bacteria use sunlight, water, and carbon dioxide to make food and oxygen

Answers

Answer: Photosynthesis

Explanation:

The process of photosynthesis is used to help make food for plants. The inputs are sunlight, water (H2O), and carbon dioxide (CO2). Then the outputs are glucose (C6H12O6) which is food, and oxygen (O2) is released.

I hope this helps :)

Fill in the blank to complete each statement
The land that supplies water to a river system is called a
Pollution from a single, identifiable source is called
Pollution that is difficult to link to a particular origin is called
source pollution
source pollution.

Answers

Answer:

1- Watershed

2- Point

3- Nonpoint

Explanation:

Just did it

Answer:

1. watershed

2. point

3. nonpoint

Explanation:

1. Compare masses: a) 0,4mol CO₂ and 0,6mol H₂O ; b) 0,135mol H₂SO₄ and 0,5mol HCI.
2. Where is the highest number of molecules? a) 0,1mol H₂O or 0,3mol CO₂ ; b) 0,25mol HCI, 3,4g H₂S or 5ml acetic acid CH₃COOH. (ρ=1,049g/ml).

Answers

Answer:

you can now deduct which one is greater or smaller and by how much.

Explanation:

no of moles= mass/molar mass

1ai) 0.4 = m/ ( 12 + (16*2)

m= 0.4* 44

m= 17.6g

ii) 0.6= m/( 2*1 + 16)

m= 0.6 *18

m= 10.8g

b) 0.135 = m/ ( 2*1 +32 + (16*4)

m= 0.135* 98

m= 13.23g

ii) 0.5= m/ (1+35.5)

m= 0.5*36.5

m= 18.25g

2. Avogadro's Number = 6.02×10²³

1 mol of any element= 6.02×10²³ particles

a) 0.1 mol of H20= (6.02×10²³) * 0.1

= 6.02×10²² molecules

ii) 0.3 mol of CO2= (6.02×10²³) * 0.3

= 1.806 × 10²³ molecules

Ans: 0.3 mol of CO2

bi) 0.25 mol of HCl= (6.02×10²³) * 0.25

= 1.505 × 10²³ molecules

bii) - find the no of moles first:

no of moles= mass/molar mass

n= 3.4g/ 34g →mr of H2S in g=2+32= 34g

n= 0.l mol

- use the Avogadro Number.

0.1 mol of H20= (6.02×10²³) * 0.1

= 6.02×10²² molecules.

biii) here you're given the density, use it to find the mass of acetic acid.

ρ = 1049 g/ml

ρ = m/v, where v=5 ml

1049 = m/ 5

m= ρ*v

m= 1049*5

m= 5245 g

• convert this into moles.

mr of CH3COOH= 12 + 3+ 12+ 16+ 16+ 1

= 60

mr in g = 60g

n= m/mr

n= 5245/ 60

n= 87. 41666...

n= 87.4 moles

•using Avogadro's Number:

87.4 moles of acetic acid=(6.02×10²³)*87.4

= 2.25148* 10²⁵

= 2.25 * 10²⁵ molecules

thus, the ans for this is 5 ml of acetic acid.

What is the empirical formula for CH2OHCH2OH?

Answers

The empirical formula is the simplest way to express a compound.

Just add up all the number of atoms in that compound

So for this example it would be C2H4(OH)2 I think. Not entirely sure.

What is the concentration of the following:

2.0mol of zinc sulphate in 10 dm^3 of solution

Answers

Answer:

Concentration is measured in moles per cubic decimetre: mol dm–3. To find the concentration of a solution, divide the number of moles by the volume in dm3. If the volume is in cm3, divide the volume by 1000 first to convert it into dm3.

Explanation:

A Snickers bar contains 27.0 g of sugars (carbohydrates), 4.0 g of protein and 12.0 g of fat. How many food calories (Cal) are contained in the bar

Answers

Answer:

There are 232 calories in the bar

Explanation:

Carbohydrates and protein are both 4 calories per gram, while fat is 9 calories per gram.

[tex]27*4=108\\4*4=16\\12*9=108\\108+108+16=232[/tex]

Typically if oxygen has a formal negative charge, it is participating in ____ covalent bond(s). Report your answer as a whole number without any decimal places.

Answers

Oxygen is participating in non-polar covalent bond(s)

Oxygen forms 2 covalent bond.

This is because oxygen atoms have 6 valence electrons. This means that it has 2 lone pairs and 2 unpaired electrons that are shared in order to achieve octet configuration.

In this chemistry, the 2 lone pairs on the oxygen are not shared with any other atoms. Instead; they are assigned to the oxygen atom. The formal charge on the oxygen atom is zero. Oxygen's atomic number is 8 and is equal to the sum of the number of its valence and inner shell electrons.

What is non-polar covalent bonding?

Nonpolar covalent bonding is a kind of covalent bond in which the bonding electrons are shared equally between the two atoms.

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Water (2470 g ) is heated until it just begins to boil. If the water absorbs 5.47x105 J of heat in the process,
what was the initial temperature of the water?
Express your answer with the appropriate units.

Answers

Answer:

47.01 °C

Explanation:

Q = mcΔt

Mass of water = 2470g

c or specific heat capacity of water = 4.18 J °C g

Q = 5.47 x 10⁵ J, which is expanded 547,000 J

No idea what Δt is, but we do know the water began to boil, and we know that water's boiling point is 100°C, so the final temperature had to be 100°C.

547,000 J = (2470) x (4.18) x (Δt)

Rearrange equation for Δt

(547,000) / (2470 x 4.18) = Δt

Δt = 52.98°C

But we're not done. We're trying to find the INITIAL TEMPERATURE of the water, not the TEMPERATURE CHANGE. We already have the final temperature, which is 100°C, and now we have how much the initial temperature rose by to get to 100°C.

All that we have to do now is 100 - 52.98 = 47.02°C

The initial temperature of the water is 47.02°C

HELP ME OUT PLS!!!!

What is the net force, to the nearest newton, that accelerates the ball?

A) 100 N

B) .000025 N

C) 40,000 N

D) 1000 N

Answers