Answer:
the answer is A) aquifers
Answer:
Aquifers
Explanation:
What are the Chemical properties of Ethyne
Answer:
Ethyne is a colourless gas with a characteristic smell. It has a melting point -81oC. It has a boiling point -84oC.
Explanation:
Which equation is balanced?
A) A
B) B
C) C
D) D
Answer:
All of them are equal cause they both have the same sign
Explanation:
Predict what would happen if plants disappear?
Decomposers will die because they will lose their food source.
All secondary consumers will die because they will lose their food source.
Oxygen will only be available during the daytime.
There will be a limited amount of oxygen in the air.
Answer:
All secondary consumers will die because they will lose their food source
mass=35g, density=5g/cm3. what is the volume?
Answer:
7 cm^3
Explanation:
Density = Mass/Volume
5 = 35/x
multiply both sides by x to get
5x = 35
then divide by 5
so x = 7 cm^3
What words did the Pilgrims use to describe the new laws?
new and legal
just and equal
godly and fair
In the underlined section, what do the colonists promise to do?
“… and by virtue hereof to enact, constitute and frame such just and equal Laws, … as shall be thought most meet and convenient for the general good of the Colony, unto which we promise all due submission and obedience.”
—Mayflower Compact
Con que otras materias se relaciona la química
Answer:
Fisica, Astronomia, Biologia
Explanation:
con esta relacion entre ellas se puede explicar y comprender fénomenos de la naturaleza.
Can you help me plss.. Answer the guide questions to write a sentence summary for photosynthesis. 1. How do plants make food?
CLUE: 2 raw materials
a. taken in from the roots and surroundings
b. taken in from the air of water
2. What act as helpers in the process? CLUE: 2 photosynthetic enzymes
a. obtained from the sun
b. the green pigment of the leaves 3. What are the two products of photosynthesis?
CLUE:
a. tastes sweet
b. the gas we breath
One:
plants make their own food through a process known as photosynthesis
Two:
Photosynthesis is a process used by plants and other organisms to convert light energy into chemical energy and stored in the form of starch which can be used later
Three:
Photosynthesis converts carbon dioxide and water into oxygen and glucose. Glucose is used as food by the plant and oxygen is a by-product.
Answer:
1. b
2. a
3. b
Explanation:
Physical change definition.
NO links, please.
Answer:
a usually reversible change in the physical properties of a substance, as size or shape:
Freezing a liquid is a physical change.
Explanation:
Answer:
Hey!
Explanation:
The definition of physical change can be expressed as.. let's say.. the physical difference in an organism. Physical change affects the form of a chemical substance, but not its chemical composition. Hope this helps! :)
Words are on the right please help!
Answer:
1.Frequency
2.Amplitude
3.Wavelength
4.Medium
5.Back and Forth
6.Up and Down
Explanation:
CORRECT ME IF I'm wrong
how is an ionic compound made up of charged particles can be electrically neutral
Answer:
Ionic compounds are electrically neutral because the charges of the cations and anions that make up the compound cancel each other out. In the case of salt for example, sodium has a charge of positive one, and chloride has a charge of negative one. Together, they neutralize the compound.
Explanation:
Choose the answer that best completes the sentence below.
Chopping up a fish is an example of a physical change; _______, grilling a fish is an example of a chemical change.
A. as a result
B. for instance
C. including
D. on the other hand
Answer:
on the other hand
Explanation:
I think its correct
a. Which line represents travel at the fastest speed? Justify your answer.__
b. Describe the line that should be added for an object that is not moving with respect to the chosen reference point.__
Answer the question using 5 complete sentences and the vocabulary terms; velocity, position, and distance
Answer:
Which line represents travel at the fastest speed? Justify your answer.__
b. Describe the line that should be added for an object that is not moving with respect to the chosen reference point.__
Answer the question using 5 complete sentences and the vocabulary terms; velocity, position, and distance
Which line represents travel at the fastest speed? Justify your answer.__
b. Describe the line that should be added for an object that is not moving with respect to the chosen reference point.__
Answer the question using 5 complete sentences and the vocabulary terms; velocity, position, and distance
Explanation:
A container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that
can kill someone in minutes. How many molecules is this?
A container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that can kill someone in minutes molecules are 9.03 × 10 ²³ molecules.
What are moles?Moles are the smallest unit of a molecule that participates in the formation of the molecules to compete in a reaction and the value will be equal to the Avogadro number 2.303 × 10 ²³.
To calculate the total number of molecules the value of one mole is 2.303 × 10 ²³. so, for 1.50 moles of hydrofluoric acid will be,
1.50 moles = 2.303 × 10 ²³.moles
hydrofluoric acid molecules = 1.50 × 2.303 × 10 ²³
hydrofluoric acid molecules = 9.03 × 10 ²³ molecules.
Therefore, 9.03 × 10 ²³ molecules are present in the container has 1.50 moles of hydrofluoric acid molecules, a deadly acid that can kill someone.
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What is the v if = 8 m and f = 20 Hz?
Answer:
Explanation:
it is 980
What will be the new pressure of a gas at 36.0 atm and 108 C if the temperature of the gas is increased to 441 C?
Answer
199 ATM
EXPLANATION
assume that the volume is constant. At higher temp the gas molecules move faster and the pressure goes up.
P=kT
CONVERT C TEMP TO K TEMP FOR GAS PROBLEMS!!!!!!
108C = 108 +273 = 381 K
441C = 441 + 273 = 714K
P=kT
108 =k x 381
K=108/381 = 0.279
AT THE HIGHER TEMP
P =0.279 X 714 =199ATM
how many sodium ions are designated as bound?
Answer:
3
Explanation:
3
HELP MEEE
What is the identity of the atom shown?
A) Fluorine
B) Neon
C) Nitrogen
D) Potassium
15 POINTS
Answer:
A FLUORINE
Explanation:
Explanation:
Option A, Fluorine is the correct answer, because it has 9 electrons in its shells.
hope this helps you.
how to scientists know where to put electrons in the atom
a. probability
b. ratio and proportions
c. algebra
d. geometry
Answer:
a).
Explanation:
precise electron locations cannot be calculated, only predicted based on previous calculations. they cannot know whether or not an electron will be or will not be somewhere specific
have a nice day!
isotopes Mg-24,Mg-25 and Mg-26 has natural abundance of 79.0%,10.0% and 11.0%. Calculate the relative atomic mass for isotopes Mg-24,Mg-25 and Mg-26.
Please help me with with this question....
how do ions form bonds, and describe the structure of the resulting compound.
Answer:
Electrons are transferred between atoms together in the ionic compound. The ions are arranged in a regular repeating pattern in an ionic crystal
Explanation:
Ions electrostatically attracts its counter ions and forms the ionic bond between these ions. The structure of ionic compounds depends on the number of atoms and bonded pair of electrons.
What is ionic bonding ?Ionic bonds are formed between metals and non-metals. Metals are electron rich and easily loss one or more electrons to the electron deficient non metals.
The loss of electrons make the atom forms a positive ion called cations. The gain of electrons make the formation of anions or negative ions. These positive ions and negative ions attracts electrostatically and forms ionic bond between them.
The structure of ionic compounds depends on the number of bonded atoms, size, presence of lone pairs etc. In solution ionic compounds exists as separate ions.
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please help???? i dont know this
Answer:
a and b
Explanation:
Answer:
The after-rain smell is produced by an interaction between rain and the oils released by plants. Due to chemical reaction between the rain water and oils secreted out by the plants
A homemade volcano can be created by combining baking soda and vinegar. When it erupts, carbon dioxide gas is released. When vinegar reacts with baking soda carbon-dioxide gas is released.
The Statue of Liberty has turned green over time due to the reaction of copper with ,oxygen,carbon dioxide and water.
Explanation:
Chemical change is defined as those change in which arrangement of atoms present in the substance changes and leads to formation of new substance.
The after-rain smell is produced by an interaction between rain and the oils released by plants. Due to chemical reaction between the rain water and oils secreted out by the plants
A homemade volcano can be created by combining baking soda and vinegar. When it erupts, carbon dioxide gas is released. When vinegar reacts with baking soda carbon-dioxide gas is released.
[tex]CH_{3} COOH+ NaHCO_3[/tex]→[tex]CO_2+H_2O+CH_3COONa[/tex]
The Statue of Liberty has turned green over time due to the reaction of copper with ,oxygen,carbon dioxide and water.
[tex]Cu+O_2+CO_2+H_2O[/tex]→[tex]Cu_2(OH)_2CO_3[/tex]
Physical change is defined as those changes which leads to change in shape, size or state of the substance changes. No new substance is formed.
is there a pattern in how one can predict how many covalent bonds an atom will form?
Answer:
In molecules, there is a pattern to the number of covalent bonds that different atoms can form. Each block with a number indicates the number of covalent bonds formed by that atom in neutral compound
Explanation:
I don't really know the answer sorry
during which two processes does a substance release energy?
Answer:
Freezing and condensation
Explanation:
Because they are exothermic, they release energy
Oxygen can be produced in the laboratory by the reaction
2KClO3———-> 2KCl+3O2
How much potassium chlorate is needed to produce 2.75 L of oxygen, collected over water at 37°C and 94.9 kPa? The vapor pressure of water at 37°C is 6.28 kPa.
Answer:
5.2g potassium chlorate is needed to do so
Why does a food web have more biodiversity?
Answer:
Biodiversity is important to the stability of food webs because it increases the complexity of interactions between organisms and makes them better :')
acid + base —> salt + water
What type of reaction is this?
[tex]\sf{Acid}+\bf{Base}\longrightarrow \tt{Salt}+\bold{Water }[/tex]
These type of reaction is called as Neutralization Reaction.
1
2. How does a detergent remove a stain?
?
Answer:
By using various chemical compounds to lift the stain while being gentle enough to keep fabric intact.
a sample of double-stranded dna contains 42% cytosine. approximately what percent of the nucleotides in this sample will be thymine?
Answer:
8% thymine
Explanation:
The percent of thymine in the given sample of the DNA will be equal to 8 %.
What is the structure of DNA?DNA, according to Chargaff, is composed of nucleotide subunits. These nucleotides are linked through two or more hydrogen-bonded to one another to form the double-stranded molecule of DNA.
The nucleotides found in the DNA molecule are Adenine, Thymine, Cytosine, and Guanine. Guanine (G) pairs with Cytosine (C) while Adenine (A) pairs with Thymine (T).
According to Chargaff's rule, the amount of Adenine is equal to that of Thymine in a DNA molecule and the same applies to Guanine and Cytosine. We can consider that the total amount of nucleotides equals 1 or 100%.
[tex]A + T + G + C = 100\%[/tex]
If Cytosine is 42 % of the DNA sample, this means that guanine will also be 42%.
G + C = 42 + 42 = 84%
A + T = 100% - 84 % = 16%
This means that Adenine and Thymine amount to 16 %. The amount of each nucleotide will be 16% ÷ 2 = 12% i.e. A = T = 8 %
Therefore, the percent of thymine in the given sample of the DNA will be 8 %.
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Which statement accurately describes the bond that forms between carbon and oxygen to create carbon dioxide
Answer:
the bond that forms between carbon and oxygen to create carbon dioxide
A polar covalent bond
what minimum frequency of light is required to ionize boron?
Answer:
frequency = 8.22 x 10¹⁴ s⁻¹
Explanation:
An electron's positional potential energy while in a given principle quantum energy level is given by Eₙ = - A/n² and A = constant = 2.18 x 10⁻¹⁸j. So to remove an electron from the valence level of Boron (₅B), energy need be added to promote the electron from n = 2 to n = ∞. That is, ΔE(ionization) = E(n=∞) - E(n=2) = (-A/(∞)²) - (-A/(2)²) = [2.18 x 10⁻¹⁸j/4] joules = 5.45 x 10⁻¹⁹ joules.
The frequency (f) of the wave ionization energy can then be determined from the expression ΔE(izn) = h·f; h = Planck's Constant = 6.63 x 10⁻³⁴j·s. That is:
ΔE(izn) = h·f => f = ΔE(izn)/h = 5.45 x 10⁻¹⁹ j/6.63 x 10⁻³⁴ j·s = 8.22 x 10¹⁴ s⁻¹
