I’ve been stumped on this, can someone please help? Thanks!

In mathematics, an ellipse is a plane curve surrounding two focal points, such that for all points on the curve, the sum of the two distances to the focal points is a constant. As such, it generalizes a circle, which is the special type of ellipse in which the two focal points are the same.

Maybe they might use that math thing for Science.

Answer: a)  The concentration after 8.8min is 0.17 M

b) Time taken for the concentration of cyclopropane to decrease from 0.25M to 0.15M is 687 seconds.

Explanation:

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

\(t=\frac{2.303}{k}\log\frac{a}{a-x}\)

where,

k = rate constant

t = age of sample

a = let initial amount of the reactant

a - x = amount left after decay process  

a) concentration after 8.8 min:

\(8.8\times 60s=\frac{2.303}{6.7\times 10^{-4}s^{-1}}\log\frac{0.25}{a-x}\)

\(\log\frac{0.25}{a-x}=0.15\)

\(\frac{0.25}{a-x}=1.41\)

\((a-x)=0.17M\)

b) for concentration to decrease from 0.25M to 0.15M

\(t=\frac{2.303}{6.7\times 10^{-4}s^{-1}}\log\frac{0.25}{0.15}\\\\t=\frac{2.303}{6.7\times 10^{-4}s^{-1}}\times 0.20\)

\(t=687s\)

Answer: I'm not really sure but I think its dew to the different heights and tempura going up and down and the flow of wind.

Explanation:

Answer:

Mountains make it possible for snow to be found at the equator. Why does the temperature become colder the higher up a Mountain? Generally the climate on mountains get progressively colder with increased altitude (the higher up you go).

Explanation:

Answer:

Kudzu kills trees and other plants by smothering and choking them with its fast-growing vines, and as the heavy vines engulf trees or shrubs their weight can actually break or uproot trees. A kudzu vine can grow as much as a foot per day and sixty feet during a growing season.

Explanation:

Answer:

Some small volcanoes only erupt once in their lives,

while other volcanoes erupt multiple times. Kilaeua volcano in Hawaii, which has been erupting continuously since 1983, is the world's most active volcano. While some volcanoes erupt at regular intervals, there are always exceptions to the rule

Answer:

small volcano's only 1 time while big volcano's mutiple times

Explanation:

Answer:

There could be several possible reasons for a small gap between rails on a railway track, such as:

1. Expansion joints: Railways are designed to allow the tracks to expand and contract with changes in temperature. To accommodate this expansion, small gaps are left between the rail ends and filled with expansion joints or plates.

2. Wear and tear: Over time, the rails may experience wear and tear due to heavy loads, weather conditions, and other factors. As a result, small gaps can appear between the rails.

3. Maintenance: During maintenance activities, rail tracks may be adjusted or replaced, which could lead to small gaps between the rails.

4. Environmental factors: Environmental factors such as soil shifts, earthquakes or other natural disasters can also affect the alignment of the rails, leading to small gaps.

These are some of the possible reasons for a small gap between the rails on a railway track.

Answer:

The small gap left between the rails in a railway track is intentional and serves a specific purpose. This gap is known as the rail joint, and it allows for the expansion and contraction of the rails due to changes in temperature. When the temperature changes, the metal rails will expand or contract, and if they were joined together tightly, they could buckle or become deformed, which could be dangerous for trains passing over them. The rail joint allows the rails to move slightly and prevent damage to the track.

Additionally, the rail joint also allows for maintenance and repairs of the track. If there were no gap between the rails, it would be challenging to replace a damaged rail or perform routine maintenance, such as tightening bolts or lubricating joints. With the rail joint, maintenance personnel can easily access and work on the track.

Overall, the small gap left between the rails in a railway track is intentional and serves a crucial function in ensuring the safety and reliability of the track.

Answer:

+6.

Explanation:

So, a chromium atom here has an oxidation number of +6.

In the given graph, the Evolved Population is showing disruptive selection. Hence, the correct option is A. Disruptive selection.

Stabilizing selection is a form of natural selection where individuals with average phenotypes are more likely to survive and reproduce their number. In this selection, the population tends to maintain a stable phenotype. As shown in the graph, the population is maximum for the population having a moderate length of neck.

Disruptive selection is a type of natural selection where extreme phenotypes are preferred over average phenotypes, leading to an increase in genetic variation and the population becoming more diverse. In this type of selection, the population diverges into two or more distinct phenotypic groups. As shown in the graph, two ranges of the population are favored for having traits for extreme lengths of the neck.

To learn more about Disruptive selection:

https://brainly.com/question/32192613

Answer:

. a reference point is required to determine whether or not an object moves

Explanation:

Answer:I would say gravity, The way the object is shaped..? You'll also need a reference point to figure out if the object is moving or not. I hope I helped! <3

Explanation:

I think it's A

Explanation:

I don't really got an explanation i just have the feeling

Answer:

i looked it up and found this for u

Explanation:

A chemical equation shows the starting compound(s)—the reactants—on the left and the final compound(s)—the products—on the right, separated by an arrow. In a balanced chemical equation, the numbers of atoms of each element and the total charge are the same on both sides of the equation

Answer: its 5ft tall and 12 inches

Explanation:

Answer:

potassium, sodium, lithium, magnesium, copper, silver, gold

Explanation:

thanks me later ')

Let us go option by option :

1) Genes are located in chromosomes. TRUE

Chromosomes are in cell nucleus. A chromosome contains hundreds and thousands of genes. A normal have 23 pairs of chromosomes, and a total of 46.

2) Chromosomes are the in nucleus.

TRUE

Chromosome is structure found in nucleus of the cell. It is made up of protein and DNA.

3) A single Chromosome can contain hundreds of genes.

TRUE

single Chromosome can contain hundreds of tgenes.

4) All of the above

TRUE

As all the statements above are true. The correct option is 4.

Answer:

all of them are true

Explanation:

this is because chromosomes contain genetic materials and it is present in the nucleus.
Therefore, the correct option is 4) all of these are true

no problem

Answer:

D

Explanation:

Meteorologists use this symbol to show that the front is a stationary front.

Answer:spectrum

Explanation:

Let's start with the basics. The electromagnetic spectrum is a range of different types of electromagnetic waves. These waves have different wavelengths and frequencies, and they include things like radio waves, microwaves, infrared radiation, visible light, ultraviolet radiation, X-rays, and gamma rays. But here's the thing: not all of these waves are visible to the human eye.

So, which ones are visible? You guessed it – it's the visible light that we're interested in. Visible light is the part of the electromagnetic spectrum that we can see. It's made up of different colors, including red, orange, yellow, green, blue, indigo, and violet. When all of these colors are combined, they make white light.

But what about the other types of electromagnetic waves? Well, they are not visible to the human eye. For example, radio waves are used to transmit radio and television signals, but we can't see them. Microwaves are used for cooking food, but we can't see them either. Infrared radiation is what we feel as heat, but it's also not visible to us. Ultraviolet radiation can cause sunburn, but we can't see it either. X-rays and gamma rays are used in medical imaging and radiation therapy, but we can't see them with our eyes.

So, in summary, visible light is the only part of the electromagnetic spectrum that we can see with our eyes. All of the other types of electromagnetic waves, including radio waves, microwaves, infrared radiation, ultraviolet radiation, X-rays, and gamma rays, are not visible to the human eye. Isn't that amazing?

Answer:

b. Solid to the gas

Explanation:

Sublimation is the process of transformation directly from the solid phase to the gaseous phase, without passing through an intermediate liquid phase.

Hope this helped!!!

Answer:

Sublimation is the transformation from the solid to the gas phase.

Explanation:

Sublimation is something like for example snow changing to water vapor without melting.

Snow is a solid and water vapor is a gas.

Answer:

An object seen in the water will usually appear to be at a different depth than it actually is, due to the refraction of light rays as they travel from the water into the air. This tutorial explores how fish, observed from the bank of a pond or lake, appears to be closer to the surface than they really are

In the given question, the amount of matter in a given space or volume is called density.

Matter is defined as any substance or anything that has mass, and which occupies space.

Density is a physical property of matter and can be defined as the mass of an object divided by its volume. Density has unit typically in grams per cubic centimeter (g/cm³) or kilograms per cubic meter (kg/m³).

It is an important property of matter because it helps to identify and distinguish different materials based on their mass and volume.

Therefore, density is the amount of matter in a particular region or volume.

Learn more about Matter here:

https://brainly.com/question/9402776

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Answer:

Kinetic energy

Explanation:

when you sled down a hill, there is a resistive force that works against you making you slow down and causes you to stop and the bottom of the hill.

Answer:

Leaf: Hey Roots, this is Leaf. I'm running low on supplies here. Can you send some over?

Roots: Hey Leaf, of course. What kind of supplies do you need?

Leaf: I need more water and nutrients. Can you send some my way?

Roots: Sure thing, we'll get on it right away. How much do you need?

Leaf: Just enough to keep me going for a few more days. Can you also send some sunlight my way?

Roots: Sorry, we can't help with that one. But we'll make sure to send enough water and nutrients to help you out.

Leaf: Thanks, Roots. You're the best. Let me know when the delivery is on its way.

Roots: Will do, Leaf. Hang in there. Delivery should be there soon.

Answer: ITS A

Explanation: HOPE THIS HELPS

Answer:

1. Reuse things like cups, towels, cloths, etc.

2. Plant a tree. (Trees and other organic energy sources are traditional sources of renewable energy.)

3. When using natural resources, only use the necessary amount so you're not wasting any.

Hope this helps!!

Answer:

I think B, but I'm not really sure, sorry!

Explanation:

A.is the answer I.e because it send

of of electrical signal

Answer:

The valency of B will be 5

Baking soda contains one sodium atom, one hydrogen atom, one carbon atom, and three oxygen atoms

Explanation:

Hope it will help you:)

Answer:The valency of B will be 5

Baking soda contains one sodium atom, one hydrogen atom, one carbon atom, and three oxygen atoms

Explanation:

Answer: B

Explanation:

Brainliest please! (if im right)

Hello there!

How is density different from weight and mass you say? It's simple!

1. Unlike weight, density is composed of mass and volume.

2. By dividing the mass over the volume, you can determine an object's density, while weight is the product of mass and gravity.

Hope this helps :) if so, can I get Brainliest?

Answer:

When hydrogen fuel burns, its atoms combine with oxygen atoms in the air, which creates a chemical reaction that releases energy in the form of heat and light. The hydrogen atoms lose their outermost electrons, becoming positively charged ions (protons). These ions combine with the oxygen atoms to form water molecules (H2O), which evaporate into the air as steam. Therefore, the atoms that make up hydrogen fuel ultimately become part of water molecules during the process of combustion.

Explanation:

Answer:

Its C. Convection

Explanation:

i did the quiz

Answer:Trade winds blowing in a curved manner

Explanation:Because i like the answer