Answer:
A. They insulate the bears and allow them to blend in with their environment
Please help I do not understand
A model of materials will show dense materials having tightly packed particles while less dense materials will have greater spaces between their particles.
What is density?Density is a measure of the compactness of a material.
Density is defined as the ratio of mass to the volume of a substance.
Density = mass/volumeDense materials have tightly packed particles while less dense materials have greater spaces between their particles.
Avogadro's hypothesis applies to substances in gaseous form since they do not have a constant volume.
Therefore, a model of materials will show dense materials having tightly packed particles while less dense materials will have greater spaces between their particles.
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Does the amount of water affect the growth of a plant?
Answer:
Yes
Explanation:
It does because of the fact that plants need water to live and the grow. Water helps the plant grow, and certain plants would need less or more water based on their roots, leaves, and tempurature tolerancy.
Answer: Yes,
Roots need both water and oxygen, and when surrounded by water, they cannot take up oxygen. Plants may slow in growth after a flush of new growth or a heavy flowering. During these periods and while it is dormant, a plant will need less water.
Which of the following elements is often used as a reactant in a nuclear fission reactor?
A. Hydrogen
B. Uranium
C. Carbon
D. Boron
Answer:
B
Explanation:
Uranium is windly use to reactant.
what is the law of Conservation of mass ?
Select the correct answer. which element can bond with titanium (ti) to form a polar covalent bond? a. beryllium (be) b. fluorine (f) c. manganese (mn) d. nitrogen (n) e. oxygen (o)
The element that can bond with titanium (Ti) to form a polar covalent bond is Nitrogen (N).
What is a Covalent Bond?In this type of bond, the atoms of the element share only one electron. As an example, we can mention the chlorine gas Cl2, in which the two chlorine atoms share an electron to achieve chemical stability.
Hence, we can see that to bond with Titanium, there needs to be an element that would form a polar covalent bond and this is Nitrogen and this is because of their electronegativity difference.
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On Eagle Mountain (the highest point in Minnesota), you weigh ____ when you travel the 15 miles to get to Lake Superior's shore.
Question 2 options:
less than
the same as
more than
all of the above
If you are up on Eagle Mountain you weigh more than when you travel the 15 miles to get to Lake Superior's shore.
What is weight?The weight of an object is the product of the mass and the acceleration due to gravity. The acceleration due to gravity of an object is the impact owing to the fact that the object lies within the earth's gravitational field.
If you are up on Eagle Mountain you weigh more than when you travel the 15 miles to get to Lake Superior's shore.
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What is the name of this alkane? two central carbons are bonded to c h 3 at each end, h below, and c h3 above the left carbon and h above the right carbon. 1-methylbutane 2-methylbutane 1,2-triethylethane 1-dimethylpropane
The name of this alkane is with central carbons are bonded to c h 3 is 2-methylbutane.
What is alkane?
Alkanes belong to the family of saturated hydrocarbons with carbon carbon single bond.
For the given alkane;
CH₃ H
CH₃ - C - C - CH₃
H H
Thus, the name of this alkane is with central carbons are bonded to c h 3 is 2-methylbutane.
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Answer:
2-methylbutane
Explanation:
How many moles of oxygen are required to make 4 moles of water?
Answer:
2 moles of oxygen
Explanation:
Basic Equation (given) :
2H₂ (g) + O₂ ⇒ 2H₂O (g)
From this, we understand for every 2 moles of water, 1 mole of oxygen is neededTaking the number of moles of oxygen and water in proportion :
1 : 21 × 2 : 2 × 22 : 4Therefore, 2 moles of oxygen are required to make 4 moles of water.
[tex] \textsf{\qquad\qquad\huge\underline{{\sf Answer}}} [/tex]
As per the given equation, we can infer that :
For getting 2 moles mole of water, 1 mole of oxygen gas was required. so to get 4 moles of water we need :
We just have to multiply the whole reaction by 2 on both sides, in order to get 4 moles of H2O on product side.
[tex] \qquad \qquad \rm4 \: H_2 + 2 \: O_2 \rightarrow4 \: H_2O[/tex]
therefore, we need
[tex]\qquad \sf \dashrightarrow \: 2 \times 1 = 2 \: moles \: \: oxygen \: gas[/tex]
A 500.0 ml. Glass filled with air is placed into water up-side-down while at 7.0°C. The water is heated to 77°C. How much air bubbles out from under the glass?
The answer is 125 ml air bubbles come out from under the glass
What is Charle's Law ?Charles's Law describes the directly proportional relationship between the volume and temperature (in Kelvin) of a fixed amount of gas, when the pressure is held constant.
V∝T
or express from two volume/temperature points:
[tex]\rm\dfrac{V_{1}}{T_{1}} =\dfrac{V_{2}}{T_{2}}[/tex]
This equation can be used to solve for initial or final value of volume or temperature
under the given condition that pressure and the number of mole of the gas stay the same.
It is given that
V₁ = 500 ml
T₁= 7 + 273 = 280 K
T₂ = 77+273 = 350 K
V₂= ?
Substituting the values in the above in the above equation
[tex]\rm\dfrac{500}{280}} =\dfrac{V_{2}}{350}[/tex]
V₂ = 625 ML
The volume of the glass is still 500 ml,
so, the volume of bubbles is 125 ml.
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Atoms of arsenic (As) are often added to silicon (Si) in a process called doping to change the conductivity of the silicon. How does the addition of arsenic change the conductivity of silicon?
An atom of arsenic has one fewer valence electron and more electron shells than an atom of silicon, so the conductivity decreases because the arsenic atom gains an electron.
An atom of arsenic has one more valence electron and more electron shells than an atom of silicon, so the conductivity decreases because the arsenic atom loses the electron.
An atom of arsenic has one fewer valence electron and fewer electron shells than an atom of silicon, so the conductivity increases because the arsenic atom gains an electron.
An atom of arsenic has one more valence electron and more electron shells than an atom of silicon, so the conductivity increases because the arsenic atom loses the electron.
Answer:
B.) An atom of arsenic has one more valence electron and more electron shells than an atom of silicon, so the conductivity decreases because the arsenic atom loses the electron.
Explanation:
Silicon is located in the 3rd row and 14th column in the periodic table. Arsenic is located in the 4th row and 15th column in the periodic table. This means that arsenic has one more valence electron than silicon. Since arsenic is located one row down from silicon, its valence electrons occupy higher energy orbitals.
Silicon maintains a crystal-like lattice structure. Each silicon atom is covalently connected to assume this shape. When silicon gains one extra electron from arsenic, it experiences n-type doping. This new electron is not tightly bound in the lattice structure. This allows it to move more freely and conduct more electricity. This can also be explained using band gaps. Silicon, which previously had an empty conduction band, now has one electron in this band. This lowers the band gap between the conduction and valence bands and increases conductivity.
Answer:
its d
Explanation:
The ph of a solution is 7. When acid is added to the solution, the hydronium ion concentration becomes 100 times greater. What is the ph of the new solution?.
After acid was added to the solution and the hydronium ion concentration becomes 100 times greater, the pH of the new solution is 5.
What is pH of solution?The pH of a solution is defined as the logarithm of the reciprocal of the hydrogen ion concentration [H+] of the given solution.
It is expressed as;
pH = -log[ H⁺]
Given that;
pH of the solution = 7Hydronium ion concentration H⁺ = ?pH = -log[ H⁺]
H⁺ = 10^( -pH )
H⁺ = 10^( -7 )
H⁺ = 10⁻⁷
When acid is added to the solution, the hydronium ion concentration becomes 100 times greater.
H⁺ = 10⁻⁷ × 100
H⁺ = 10⁻⁵
pH of the new solution will be;
pH = -log[ H⁺ ]
pH = -log[ 10⁻⁵ ]
pH = 5
Therefore, after acid was added to the solution and the hydronium ion concentration becomes 100 times greater, the pH of the new solution is 5.
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The densities of copper, silver, iron, and magnesium are in that order. You are given grams of each metal. Which one has the largest volume
Density is the ratio of mass to volume. The substance with the lowest density has the largest volume. The volume of magnesium will be the largest.
What is density?Density is the mass per volume of the substance. It is denoted by the Latin letter rho (ρ) or D. It is the division of the mass in kilograms to the volume in cubic meters.
The relation of the density is inversely proportional to the volume and when the order is given in increasing order of density then magnesium will have the largest volume as it has the least density.
Therefore, magnesium has the largest volume.
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Two objects are filled with air, and have the exact same mass. There air in the first object is heated and it now has a higher temperature than the second object. The air in which object has more thermal energy?
Balance the following chemical equations:
Don’t delete comment or I’ll report
Answer:
The molar mass of O is 16 g/mol and since we have 2 oxygen molecules we multiply 16 g/mol to get 32 g/mol. Therefore our best option would be option C, 32 g/mol.
A copper foil is made from copper, absolutely free of impurities. Which term or terms could be used to describe this sample of copper
Answer:
Explanation:
pure chemical substances and element.
All elements are pure. If this sample of copper had been impure, we would call it a mixture, not an element.
Body systems often interact with each other. The image below shows parts of body systems that interact to fulfill a function for the body.
Which statement describes how the body systems in the image work together to perform a common function
According to the research, the body systems work together to perform a common function through the coordination of endocrine substances and nerve impulses.
What are the body systems?They are the different sets of organs that make up the body, collaborating in each case with the fulfillment of some specific type of functions.
This simultaneous and juxtaposed set of systems involves various organs, ducts, tissues and various glands, all coordinated by endocrine substances and nerve impulses, so as to operate more or less autonomously as the case may be.
Therefore, we can conclude that according to the research, the body systems work together to perform a common function through the coordination of endocrine substances and nerve impulses.
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Which would most likely from a homogeneous mixture
Answer:
Sand would most likely be a homogeneous mixture
nuclear reactions take place where?
a) ring of electrons, b) the entire atom, c) nucleus, d) none of these
One atom has 11 protons and 13 neutrons. Another has 11 protons and 12 neutrons. Are they the same or different elements?
Answer:
deferent elements
Explanation:
because 11n 12 is not the same as well as13
Answer: They are the same elements
Explanation:
They're same elements because the number of electrons are same (number of protons=electrons).
The number neutrons don't matter.
If any two atoms have the same number of Electrons and protons and has different number of neutron's they still are the same element.
which device requires electrical energy to produce a chemical change
Electrolytic cell is the device which requires electrical energy to produce a chemical change.
What is an Electrolytic cell?This is referred to as electrochemical cell that requires an external source of electricity to effect a chemical change.
Without the source of the electricity, the chemical change won't have been produced at all.
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What do makeup experts use in order to create different skin effects?
Answer:
on-skin silicone, liquid latex, and gelatine
Explanation:
hope this helps:)
Which word equation shows lithium oxide being formed from the reaction between oxygen and lithium? oxygen lithium oxide right arrow. lithium lithium oxygen right arrow. lithium oxide oxygen lithium right arrow. lithium oxide lithium oxide right arrow. lithium oxygen
The equation of the reaction for the formation lithium oxide from lithium and oxygen is given as:
[tex]2Li + O_2 \rightarrow Li_2O[/tex]
What is the equation for the formation of Lithium oxide?Lithium oxide is a compound formed from the reaction between lithium and oxygen.
The equation for the chemical reaction is given below:
[tex]2Li + O_2 \rightarrow Li_2O[/tex]
Therefore, the reaction between lithium and oxygen yields lithium oxide.
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what information we get Chemical equation ?
Answer:
We get the following information from a chemical equation :--1. We get the symbol and formulas of the reactants and products.
2. The physical state of the reactants and products.
3. From this reaction, we can know the molecular formula of ammonia, water and nitrogen.
4. Here all the species are in a gaseous state.
5. The reaction takes place at a high temperature and pressure.
6. Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This equation is written as:
Zinc metal reacts with dilute sulphuric acid to form zinc sulphate and hydrogen gas. This equation is written as: Zn+H2SO 4→ZnSO 4 +H2.
what is your question in climate change?
Answer:
Why has my town experienced record-breaking cold and snowfall if the climate is warming? Is there scientific consensus that people are causing today's climate change? Do natural variations in climate contribute to today's climate change?
Explanation:
Yan po ang answer tama po yan
Which is true about distillation? (1 point)
It uses semipermeable membranes to filter out particles.
It removes mainly large particulate contaminants which settle to the bottom.
It is one of the easiest and cheapest filtration solutions to implement.
It may leave some chemicals such as herbicides and pesticides in the water.
Answer:
It may leave some chemicals such as herbicides and pesticides in the water
Explanation:
i just took the test
Distillation may leave some chemicals such as herbicides and pesticides in the water. Therefore, option D is correct.
What is distillation ?By using selective boiling and condensation, distillation, also known as traditional distillation, is the process of removing the constituents or compounds from a liquid mixture. The process of heating solid materials to create gaseous products is known as dry distillation.
A chemical is purified through distillation by being separated from a non-volatile or less-volatile substance. Because various compounds frequently have different boiling points, when a mixture is distilled, the components frequently separate from the mixture.
Among the many industrial uses of distillation are the production of alcoholic drinks, water purification, and oil refining. Distillation is a physical procedure that removes desired pure compounds from an initial source using heat and other techniques.
Thus, option D is correct.
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What is the approximate tangential speed of an object orbiting earth with a radius of 1.8 × 108 m and a period of 2.2 × 104 s? 7.7 × 10–4 m/s 5.1 × 104 m/s 7.7 × 104 m/s 5.1 × 105 m/s
This question involves the concepts of time period and tangential speed.
The tangential speed of the object is "5.1 x 10⁴ m/s".
What is the time period?The following formula gives the time period of the object:
[tex]T=\frac{2\pi}{\omega}\\\\[/tex]
[tex]\omega = \frac{2\pi}{T}[/tex]
where,
[tex]\omega[/tex] = angular speed = ?T = time period = 2.2 x 10⁴ sTherefore,
[tex]\omega=\frac{2\pi}{2.2\ x\ 10^4\ s}\\\\\omega=2.86\ x\ 10^{-4}\ rad/s[/tex]
Now, the tangential speed can be given by the following formula:
[tex]v=r\omega[/tex]
where,
r = radius = 1.8 x 10⁸ mv = tangential speed = ?Therefore,
[tex]v=(1.8\ x\ 10^8\ m)(2.86\ x\ 10^{-4}\ rad/s)[/tex]
v = 5.1 x 10⁴ m/s
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Answer: 5.1 x 10⁴ m/s
Explanation:
edge 2023
ii. If the pressure after landing was 1.0 atm, what was the volume of the passenger's collapsed water bottle? (Assume the bottle collapsed easily and temperature didn't change.) (6 points)
Using the ideal gas equation and Gay Lussac's law, the volume of the passenger's collapsed bottle after landing is 0.0075 L.
What is ideal gas equation?The ideal gas equation shows the relationship between temperature, pressure, volume and number of moles.
The volume of the passenger's collapsed bottle after landing is 0.0075 L.
Given that;
PV = nRT
P = gas pressureV = volume of gasn = number of moles of gasR = molar gas constantT = temperaturen = PV/RT
Hence:
P = 0.75 atm;
V = 0.5 L;
T = 295 K;
R = 0.082 atmL/K.mol
n = 0.75 * 0.5 / 0.082 * 295
n = 0.015 moles
If the pressure after landing was 1.0 atm;
V1n1 = V2n2
V2= V1n1/n2
V2 = 0.5 L * 0.015 moles/ 1 mole
V2 = 0.0075 L
The volume of the passenger's collapsed bottle after landing is 0.0075 L.
Missing parts;
A passenger on an airplane finished a 0.5 L bottle of water during the flight
and replaced the lid. The cabin pressure and temperature were maintained at
0.75 atm and 295 K during the flight. After landing, he noticed his empty water
bottle had collapsed. (12 points)
i. How many moles of gas were in the water bottle?
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What is the molarity of the resulting solution when 45.0 mL of a 1.90 M H2SO4 solution is added to 95.0 mL of 0.600 M H2SO4
When 45.0 mL of a 1.90 M H₂SO₄ solution is added to 95.0 mL of 0.600 M H₂SO₄the molarity of the resulting solution is 0.95 M.
To answer the question, we need to know what molarity is.
What is molarity of a solution?Molarity is the number of moles per unit volume with volume in liters.
To find the molarity of the resulting solution, we need to find the number of moles in each solution.
Number of moles, n = MV where
M = molarity of solution and V = volumeNumber of moles in first solution
Given that we have 45.0 mL of a 1.90 M H₂SO₄ solution.
M' = 1.90 M and V' = 45.0 mL = 0.045 L
So, n' = M'V'
= 1.90 M × 0.045 L
= 0.0855 mol
Number of moles in second solution
Given that we have 95.0 mL of 0.600 M H₂SO₄ solution.
M" = 0.600 M and V" = 95.0 mL = 0.095 L
So, n" = M"V"
= 0.600 M × 0.095 L
= 0.057 mol
Number of moles in resulting solution
The number of moles in the resulting solution is n'" = n' + n"
= 0.0855 mol + 0.057 mol
= 0.1425 mol
Volume of the resulting solution
The volume of the resulting solution is V"' = V' + V"
= 45.0 mL + 95.0 mL
= 150.0 mL
= 0.15 L
The molarity of the resulting solution
The molarity of the resulting solution is M'" = n"'/V"'
= 0.1425 mol/0.15 L
= 0.95 mol/L
= 0.95 M
So, the molarity of the resulting solution is 0.95 M.
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Compounds I and II can be distinguished by comparing the number of signals in their 1H NMR spectra. How many signals are expected in the 1H NMR spectrum of each compound
The spectrum of the first compound will have only one signal, but the spectrum of the second compound will have two signals.
What is a compound?A compound is a substance formed by combining two or more different chemical elements in such a way that the atoms of the individual elements are linked together by chemical bonds that are difficult to break in chemistry.
Hence it is right to state that the spectrum of the first compound will have only one signal, but the spectrum of the second compound will have two signals.
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