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## GEOMETRY HELP PLEASE!! HOW ARE TRIANGLE PROOFS USED TO PROVE OTHER PROPERTIES OF GEOMETRIC FIGURES? EXPLAIN

GEOMETRY HELP PLEASE!! HOW ARE TRIANGLE PROOFS USED TO PROVE OTHER PROPERTIES OF GEOMETRIC FIGURES? EXPLAIN

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## Which of the following properties is unique to echinoderms within

Which of the following properties is unique to echinoderms within

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## The cell membrane around a cell forms a barrier that protects and regulates the cell. Certain chemicals can pass through the plasma membrane because they have similar chemical properties as the membrane. Which best describes those that can pass through? They are concentrated. They are soluble. They are diluted. They are heated.

The cell membrane around a cell forms a barrier that protects and regulates the cell. Certain chemicals can pass through the plasma membrane because they have similar chemical properties as the membrane. Which best describes those that can pass through? They are concentrated. They are soluble. They are diluted. They are heated.

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## Visit this website and locate the element mercury, whose chemical symbol is Hg. Click on the square to read about the history, properties, and uses of mercury. Name three uses for mercury.

Visit this website and locate the element mercury, whose chemical symbol is Hg. Click on the square to read about the history, properties, and uses of mercury. Name three uses for mercury.

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## 25. From left to right across a period in the periodic table, elements become less ___________ and more ______________ in their properties. 26. Francium has 36 isotopes, but only francium-223 occurs in nature. Francium-223 spontaneously emits particles and energy, so francium-223 is a(an) _____________ of francium. 27. At sea level, water ______________ at 100°C. 28. Cooking requires continuous addition of energy to the chemical reactions that are taking place. The chemical reactions involved in cooking can be described as __________________. 29. The ________________ theory of matter states that all particles of matter are in constant motion. 30. In Rutherford’s experiments, some of the _______________ aimed at gold atoms bounced back, suggesting that a solid mass was at the center of the atom. 31. You are given the melting points of three unknown substances and are asked to predict which one is an ionic compound. You would select the compound with the ________________ melting point. 32. A flight simulator that helps astronauts prepare for a shuttle launch is an example of a(an) __________________. 33. In the symbol ■([email protected]) He, the superscript 4 is the _________________ for helium, and the subscript 2 is the ___________________ for helium.

25) Answer is: less metallic and more nonmetallic.

Electronegativity increases from left to right across a period, atoms have tendency to attract electrons.

Electronegativity (χ) is a property that describes the tendency of an atom to attract a shared pair of electrons.

Radioisotope has an unstable atomic nucleus and emit energy and particles when it changes to a more stable form.

Francium (Fr) is element with atomic number 87 (87 protons and 87 electrons).

Boiling is the temperature at which the vapour pressure of the liquid is equal to the pressure exerted on the liquid by the surrounding atmosphere.

The Celsius scale was based on 0°C for the freezing point of water and 100°C for the boiling point of water at 1 atm pressure.

There are two types of reaction:

1) endothermic reaction (chemical reaction that absorbs more energy than it releases, ΔH>0).

2) exothermic reaction (chemical reaction that releases more energy than it absorbs).

For example, the breakdown of ozone is an endothermic process. Ozone has lower energy than molecular oxygen (O₂) and oxygen atom, so ozone need energy to break bond between oxygen atoms.

The average kinetic energy of molecules depends on the temperature.

As temperature increases, molecules gain more energy from surrounding and move faster.

Kinetic energy (standard unit is the joule J) depends on speed of the molecule.

Solid gains kinetic energy to become a liquid and then becomes a gas.

This was famous Rutherford’s Gold Foil Experiment: he bombarded thin foil of gold with positive alpha particles.

Rutherford observed the deflection of alpha particles on the photographic film.

Alpha particles are helium atom particles, consist of two protons and two neutrons.

According to Rutherford model of the atom: atoms have their charge concentrated in a very small nucleus.

For example, calcium oxide.

Calcium oxide (CaO) has ionic bonds between calcium cations (Ca²⁺) and oxygen anions (O²⁻).

Because it has strong ionic bonds, it has high melting point (around 2600°C).

Ionic bond is the electrostatic attraction between oppositely charged ions (cations and anions).

32) Answer is: a scientific model.

A scientific model is a representation of an idea, an object, a process or a system that is used to describe and explain phenomena that cannot be experienced directly.

33) Answer is: the superscript is mass number and the subscript is atomic number.

Atomic number(Z) is the number of protons, which is characteristic of a chemical element..

Mass number (A) is the total number of protons and neutrons in a nucleus.

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## Bio 1 01.04 properties of water

1.04
Properties of Water

Question: What
effect will adding soap to water have on surface tension?

Hypothesis: If,
soap is added to the water slowly dropped on a penny then, the penny will hold
more water.

Independent/Dependent/Control
Variables: Independent: the amount of soap/oil; Dependent: the penny;
Control: amount of oil/water given

Materials: 3 cups,
water, canola or olive oil, dish soap, a pipette and or needle/syringe, pennies

Procedure:

·
Gather three identical cups

·
Add water to the first one (1/3 cup of water in each), add water and soap in the second one,
and olive or canola oil in the third.

·
Lay out three pennies.

·
Take pipette and slowly bring water in from cup #1,
drop onto penny until water falls over, record results of how many drops it
took.

·
Repeat with cup numbers 2-3 and record
information/data.

Data/Observations: With the
regular water on a penny, I noticed that only 13 regular drops could fit on
without falling over.

With the water+soap, it got up to 24 drops before falling
over. Then on the 25th drop, the mixture fell off.

With the oil, it was the highest at 29 drops before falling
over slowly. Therefore, oil holds the most surface tension in this experiment.

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## Which of the following options is used to view a computer's memory properties? a) Accessories b) Device Manger c) Sytem and Hardward d) Control Panel

Which of the following options is used to view a computer’s memory properties? a) Accessories b) Device Manger c) Sytem and Hardward d) Control Panel

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## Name three properties of solids that are different from those of liquids. Explain the differences for each.

1) Solids have a fixed shape
The particles of solids are held into their positions and are only able to vibrate about fixed points. The strength of the bonding means that the particles have their own shape, which they retain, and do not take the form of the container they are in.

2) Solids may not flow
The molecules of liquids are able to slide past one another due to weaker bonds between particles. This allows the liquid to flow; whereas, this movement is not possible in solids so they cannot flow.

3) Solids may fracture
The fact that solids possess a rigid structure means that they have the ability to fracture. Although some are able to withstand more stress than others, all solids may break. This breakage occurs when the intermolecular bonds are mechanically broken. This is not possible in the case of liquids because such rigid intermolecular bonds do not exist.

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## The table describes a gas stored in four different containers. properties of stored gas container properties 1 · low number of collisions with container walls · medium average kinetic energy · large number of particles 2 · large number of collisions with container walls · medium average kinetic energy · small number of particles with little spaces between them 3 · large number of collisions with container walls · high average kinetic energy · large number of particles with large spaces between them 4 · few collisions with container walls · low average kinetic energy · small number of particles which container has gas stored at the highest temperature?

The equation for how temperature changes the resistance R is:

R=R₀(1+α(T-T₀)), where R₀ is the resistance at T₀=20°C, T is the temperature for which we want to calculate the resistance and α is the temperature coefficient for resistance.

The resistance of the copper wire increases by 18% or by 0.18, so the new value for the resistance is R=1.18*R₀.

T₀=20°C
=0.0068
R=1.18*R₀

Now we need to input that into the equation for resistance change and solve for temperature T.

1.18R₀=R₀(1+α(T-20)), R₀ cancels out,

1.18=1+α(T-20),

1.18-1=α(T-20), we divide by α,

0.18/α=T-20, we put 20 on the left side,

26.47+20=T

T=46.47°C

So the temperature on which the resistance of copper wire will increase by 18% is T=46.47°C.

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## Areas near oceans or large lakes tend to have more moderate climates than do areas far from large bodies of water. Which of these statements best explains this observation? Hydrogen and oxygen atoms share electrons in a water molecule. Lakes and oceans contain dissolved solids. Water has a very high specific heat. Water produces buoyant forces. Question 2(Multiple Choice Worth 2 points) A scientist discovers a new substance. The molecules of the substance form hydrogen bonds with each other. When the molecules lose a lot of energy, the hydrogen bonds hold them relatively far apart. Based on this information, what can the scientist infer about the substance? It expands when it freezes. It is highly colored. It exists only as a gas. It does not dissolve ionic compounds. Question 3(Multiple Choice Worth 2 points) Which of the following properties of water is due primarily to the uneven distribution of charge between the hydrogen and oxygen atoms? its color its taste its ability to dissolve ionic substances its ability to produce buoyant forces Question 4(Multiple Choice Worth 2 points) A drop of water placed on a smooth, dry surface will form a dome-shaped droplet instead of flowing outward in different directions. Which of these best explains this observation? The bonds between hydrogen and oxygen atoms are very strong. The electrons in the atoms attract the electrons in the other atoms. Water molecules at the surface experience fewer hydrogen bonds than water molecules within the liquid. Water molecules near the surface produce more buoyant force than water molecules within the liquid.

The gravitational force Fg between two objects is given by the equation:

Fg=(G*m₁*m₂)/r₂, where G=6.67*10^-11 m³ kg⁻¹ s⁻² is the gravitational constant, m₁ and m₂ are the masses of the two bodies and r is the distance between those bodies.

Due to the gravitational attraction the pencil and the eraser will attract if we there is no friction on the surface.

m₁=10 g=0.01 kg is the mass of the pencil
m₂=20 g=0.02 kg is the mass of the eraser
r=2.5 cm = 0.025 m

First we calculate the Fg:

Fg={(6.67*10^-11)*0.01*0.02}/(0.025²)=2.1344*10^-11 N

To get the velocity v of the pencil:

v²=2as, where a is the acceleration of the pencil and s is the path. In our case s=r so we can write:

v²=2ar

a=Fg/m₁= 2.133*10^-9 m/s²

v²=2*(2.133*10^-9)*0.025=1.0665*10^-10

v=√(1.0665*10^-10)=1.0327*10^-5 m/s

We have the velocity and the acceleration, so we can calculate the time t with the equation:

t=v/a=(1.0327*10^-5)/(2.133*10^-9)=4841.6 s

1 hour has 3600 s so when we divide time t in seconds by 3600 we get time T in hours:

T=t/3600=4841.6/3600=1.3449 h.

So the time for the pencil and eraser to touch is T=1.3449 hours.

Also time T can be expressed like T= 1h and 20 mins and 41.64 s

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## Describe essential properties used to define life. which prokaryotic cell structures are involved in carrying out these life processes? explain your answer.

Climate change
Greenhouse effect

Some heat energy from the Earth’s surface escapes into space. If too much heat energy escaped, the planet would be very cold. However some gases in the atmosphere can trap escaping heat energy, causing some of it to pass back to the surface.

These are called greenhouse gases, and they keep our planet warm, which is a good thing. Carbon dioxide is an important greenhouse gas.

Increasing carbon dioxide levels

Humans burn fossil fuels such as oil, coal and natural gas. The energy released is used to power cars and other machines, to generate electricity, and to keep buildings warm. The burning fuel releases waste gases, including carbon dioxide. As the human population increases, more fuel is used, and more carbon dioxide is released.

Global warming

The extra carbon dioxide increases the greenhouse effect. More heat is trapped by the atmosphere, causing the planet to become warmer than it would be naturally. The increase in global temperature this causes is called global warming.

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## In baillargeon’s view, infants have a pre-adapted, innate bias called the principle of _____ that explains their assumption that objects do not change their properties unless some external factor obviously intervenes.

‘D’ and ‘E’ are definitely not good answers. You can’t measure ‘bias’, so ‘A’ and ‘B’ are out of the question. Best answer is C. Because Biased people can change the outcome but gerrymandering is manipulating boundaries.

Do not hold me against this answer, this is just my opinion, hope this helps or affects your insight in a positive way.

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## Because atoms of elements in the same group of the periodic table have the same number of neutrons, they have similar properties is this true or false

a metal

an element

Explanation:

Copper is a metal (it is the chemical element known as Cu, atomic number 29) and is among the first metals discovered by humans, used since ancient times for the production of coins and ornaments. Its color is a reddish orange that arouses interest in several pieces. It participates in the manufacturing process of bronze, metal that is made of copper with tin, and has several properties that help in the production and use of this metal in everyday life.

To better understand what this metal is and its importance in everyday life, as well as its main use, it is interesting to know its properties:

1 – Great conductor: This metal easily conducts heat and electricity, being used in various operations that require this property.

2 – Not corrosive: Like some other metals, aluminum, for example, copper resists corrosion.

3 – Easily molded: This property facilitates the production of various copper objects and products. Remember that, although easily moldable, it is very resistant metal.

4 – Anti-Bactericide: It does not absorb many bacteria as it slows the growth of germs that are bad for your health.

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## Which of these properties is preserved exclusively under dilation? A. Symmetry B. Similarity 3. Congruence

Which of these properties is preserved exclusively under dilation? A. Symmetry B. Similarity 3. Congruence

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## Which of the following best describes the difference between a mixture and a pure substance? A. A mixture is made up of only one type of atom; a pure substance is made up of more than one type of atom. B. A mixture has different properties throughout; a pure substance has the same properties throughout. C. A mixture has the same properties throughout; a pure substance has the different properties throughout. D. A mixture is made up of more than one type of atom; a pure substance is made up of only one type of atom.

The type of plants that you can expect to see growing first after the flood are small annual plants.

Explanation:

There are two types of ecological succession, primary and secondary ecological succession. These two successions are created by different factors. A success that is produced by the flood is a secondary succession. A secondary succession refers to a type of succession in which an earlier built ecosystem is demoted to a smaller population of species. For this type of succession, the soil is already present and the seeds, roots and vegetative parts of some of the damaged plants may survive. Thus, secondary succession is normally quicker than primary succession, which average start out on bare lands or rocks. The pioneer species for small succession are annual plants, followed by shrubs and then pine and oaks. The pioneer specie for the primary sequence is lichen, which has the strength to grow where there is no soil.

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## Which element's properties form the basis for all life? hydrogen silicon carbon

Which element’s properties form the basis for all life? hydrogen silicon carbon

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## 3. Compare properties of squares and rhombi to properties of other quadrilaterals by answering each question. Write a brief explanation for each answer. (a) Describe a property of squares that is also a property of rectangles.

The largest earnings gap between men and women is

Step-by-step explanation:

Earnings gap between men and women:

A. some high school (no diploma)

Earnings of men= \$479

Earnings of women= \$375

Earnings gap= \$ (479-375)

= \$ 104

Earnings of men= \$701

Earnings of women= \$518

Earnings gap= \$ (701-518)

= \$ 183

C. some college

Earnings of men= \$819

Earnings of women= \$624

Earnings gap= \$ (819-624)

= \$ 195

Earnings of men= \$1274

Earnings of women= \$950

Earnings gap= \$ (1274-950)

= \$ 324

The largest earnings gap between men and women is

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## Compare properties of squares and rhombi to properties of other quadrilaterals by answering each question. Write a brief explanation for each answer. (a) Describe a property of squares that is also a property of rectangles. (b) Describe a property of squares that is not a property of rectangles. (c) Describe a property of rhombi that is also a property of parallelograms. (d) Describe a property of rhombi that is not a property of parallelograms

(a) They are both quadrilaterals with two sets of congruent sides.
(b)  A square has 1 set of congruent sides and that includes all 4 sides. A rectangle has 2 sets of congruent sides, 1 for the length sides, and 1 for the width sides.
(c). They both have two sets of parallel sides.
(d). A rhombi has 4 equal sides, while a parallelogram has 2 equal lengths and 2 equal widths.

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