Answer:
A ( I think? )
Explanation:
your welcome
how many molecules are in 45.0 g of water
Question 2 (5 points)
What is the rock cycle? Select the best two answers from the choices below.
a
b
A concept in geology that describes transitions and relationships among the three main rock types
A way to show how Earth's different spheres interact with one another
The primary indicator of climate change
A series of processes that create and transform the types of rocks in Earth's crust
Uc
Jd
Answer:
A. A concept in geology that describes transitions and relationships among the tree main rock types.
D. A series of processes that create and transform the types of rocks in the Earth’s crust.
Explanation:
A and D are the best two answers from the choices below because they both correctly describe the rock cycle.
The rock cycle which according to Wikipedia is a basic concept in geology that describes transitions through geologic time among the three main types of rock;
1. Sedimentary,
2. Metamorphic and
3. Igneous rocks
A rock cycle can take very long time. It could be thousands or millions of years
1. identify a metal that matches each of the following descriptions. There may be more than one possible metal.
a Reacts slowly with cold water to form a hydroxide.
b Does not react with oxygen when heated.
c Reacts slowly with dilute acid.
d Reacts very vigorously in cold water to form hydroxide.
Answer:
I don't think there is any metal matches with this condition
Natasha is learning about density in science class. She has been given three different geometric shapes made from different substances and asked to determine which has the greatest density. She measures the masses of the objects and records her results in the table below
What should Natasha do next to determine the relative densities of the objec
A. She should measure the temperature of each object.
B. She should measure the volume of each object.
C. She should measure the surface area of each object.
D. She should measure the circumference of each object.
What does a hygrometer measure?
Answer:
humidityExplanation:
Hygrometer, instrument used in meteorological science to measure the humidity, or amount of water vapour in the air. Several major types of hygrometers are used to measure humidity.
what's the advantage and disadvantage of using a stopwatch, clamp, thermometer, butanol, methanol, ethanol, propanol and other equipment from the lab
please help me
What is the definition of Monohybrid cross
Answer:
A monohybrid cross is a cross between two organisms with different variations at one genetic locus of interest. The character being studied in a monohybrid cross are governed by two or multiple variations for a single locus.
Explanation:
A monohybrid cross is a cross between two organisms with different variations at one genetic locus of interest. The character being studied in a monohybrid cross are governed by two or multiple variations for a single locus.
Answer:
a monohybrid crosses a cross between two organisms with different variations at one genetic locus of interest
what property of
water is determined
by dissolved Ca2+,
Mg2+ ions?
Answer:
Explanation:
Common cations found in hard water include Ca2+ and Mg2+. These ions enter a water supply by leaching from minerals within an aquifer.
Where do animals obtain their chemical energy? I WILL MARK BRAINLEST HELP ASAP!!!
from plants only
from plants and animals
from animals only
directly from solar energy
Answer:
from plants and animals.
In a healthy pond, the temperature is 16°C (61°F). What is the most likely pH of this pond?
A. 6.3
B. 5.3
C. 5.0
D. 4.0
Answer:
A . 6.3 In a healthy pond, the temperature is 16°C (61°F). What is the most likely pH of this pond
In a healthy pond, the temperature is 16°C (61°F). 6.3 is the most likely pH of this pond.
What do you mean by pH ?A measure of the acidity or basicity of a substance or solution. The pH scale ranges from 0 to 14. A pH value of 7 is neutral on this scale, indicating that it is neither acidic nor basic.
A pH value less than 7 indicates that it is more acidic, while a pH value greater than 7 indicates that it is more basic.
"Potential of Hydrogen" is the full form of pH. The negative logarithm of H+ ion concentration is known as pH. As a result, the meaning of the name pH is explained as hydrogen strength or power.
Thus, In a healthy pond, the temperature is 16°C (61°F). 6.3 is the most likely pH of this pond, so the pond is more acidic in nature.
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PLEASE HELP I WILL MARK YOU BRAINLIEST !!If you react 4.25 moles of FeCl2, how many moles of Cl2 did you also react?
PLEASE IM BEGGING FOR HELPPPPP
Answer:
2 FeCl2 + Cl2 -> 2 FeCl3
According to numbers in reaction
Amount of Cl2 is half of FeCl2
Explanation:
Multiple choice
In a given chemical reaction, 1 mol of sulfur reacts with 4 moles of chlorine.
4S + 2Cl2
S + 4 Cl2
S + 2Cl2
S + Cl2
Answer:
S + 4 Cl2
Explanation:
Sulphur - S
1 mol of Sulphur = S
Chlorine = Cl2
4 moles of Chlorine = 4Cl2
4S + 2Cl2
Incorrect option
S + 4 Cl2
Correct option
S + 2Cl2
Incorrect option
S + Cl2
Incorrect option
Can you please help me it’s not a hard question
Which type of solute would have the greatest impact on a colligative property?
A. C6H12O6
B. NaCl
2KBr + Cl2 → 2KCl + Brz How many moles of KCl are produced if 8.4 moles of Cl, gas completely react? O 4.2 8.4 16.8 33.6
Answer:
As KBr
is producing lesser moles of product so, KBr
is limiting reactant and produced potassium chloride=
187.74g
Help quickly pleaaas
Answer:
chymotrypsin, cleaves peptide bonds selectively on the carboxylterminal side of the large hydrophobic amino acids such as tryptophan, tyrosine, phenylalanine, and methionine
Under certain conditions butane reacts with oxygen to form butanone which can be easily hydrogenated to butanol. Butene is easily made from butanol by elimination of water.
Explanation:
These are for the first too
What is an adaptation?
A.characteristic that has been passed down
B.characteristic that has been recently learned
C.characteristic that has been passed down or recently learned to help survive its environment
D. characteristics that help attract pollinators
Answer:
C
Hope that helps!
Explanation:
Answer:
C. characteristics that has been passed down or recently learned to help survive its environment
Which statement about Bohr’s model of the atom is false?
A. Electrons cannot be between energy levels.
B. Electrons orbit the nucleus.
C. An electron’s path is not known exactly.
D. Electrons exist in energy levels.
The statement which is false about Bohr's model is option C, "an electron's path is not known exactly". Electron's path can be determined using the knowledge of different energy levels.
What are energy levels?Energy levels in an atom is circular paths having fixed energy through which the electrons are revolving around the nucleus. This model of atom was proposed by Niels Bohr.
According to Bohr's atomic model, electrons are revolving through fixed energy levels around the nucleus, where the velocity and momentum of electron and the radius of the atom can be determined using the model.
Bohr's model of atom contributed well to the atomic structure and helped to determine the energy of electronic transitions.
Hence, the statement an electron's path is not known is false.
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Suppose Rutherford's lab was 10 meters (m) long and the speed of an alpha particle is 3.0x10^8 meters per second (m/s). How much time would he plan on the alpha particles taking to move from the alpha particle source to the gold foil target? Write it in a mathematical equation
Answer:
t = d/v , 33.3 ns
Explanation:
Since distance, d = vt where v = speed and t = time taken to cover the distance.
Since the distance, d covered by the alpha particle is the length of Rutherford's lab which is 10 m long and the speed of the alpha particle is v = 3 × 10⁸ m/s, the time, t it takes the alpha particle to move from the alpha particle source to the gold foil target is thus
t = d/v
= 10 m/3 × 10⁸ m/s
= 10/3 × 10⁻⁸ s
= 3.33 × 10⁻⁸ s
= 33.3 × 10⁻⁹ s
= 33.3 ns
For the balanced equation shown below, how many moles of N2 reacted, if 155 moles of NH3 are produced?
3H2 + N2 => 2NH3
Answer: 1 mole nitrogen produces 2 moles ammonia
How many moles you need for 155 mol ammonia?
155/2 moles
Explanation:
Radioactive decay occurs when the ____ decays
Answer:
nucleus i think
Explanation:
Determine the expected mass of the copper after 24 hours
The expected mass of copper element after 24 hours as per graph is 288 grams.
What is an element?It is defined as a substance which cannot be broken down further into any other substance. Each element is made up of its own type of atom. Due to this reason all elements are different from one another.
Elements can be classified as metals and non-metals. Metals are shiny and conduct electricity and are all solids at room temperature except mercury. Non-metals do not conduct electricity and are mostly gases at room temperature except carbon and sulfur.
The number of protons in the nucleus is the defining property of an element and is related to the atomic number.All atoms with same atomic number are atoms of same element.In every 10 minutes 2 mg of copper is produced thus after 24 hours that is 1440 minutes copper amount will be 1440×2/10=288 mg.
Thus, the expected mass of copper element after 24 hours as per graph is 288 grams.
Learn more about element,here:
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Mazlan menjelaskan lidah sebagai kulit yang mempunyai rasa.Adakah anda setuju dengan penjelasan lidah sebagai kulit?Jelaskan jawapan anda
Answer:
tidak
Explanation:
kerana lidah bukan kulit,lidah ialah organ badan untuk merasa sesuatu,kulit kita hanya untuk mengeluarkan peluh bukan untuk merasa
Please answer thank you so much!
Help!!! Would give brainliest
Answer: Acids have a pH of less than 7 and generally form [tex]H^+[/tex] when dissolved in solution. [tex]H_2SO_4[/tex] is an example of acid.
Bases have a pH of more than 7 and generally form [tex]OH^-[/tex] when dissolved in solution. [tex]Ca(OH)_2[/tex] is an example of base.
Water is neutral and has a pH of exactly 7. Therefore in chemical equations it can act as acid or a base.
Explanation:
pH or pOH is the measure of acidity or alkalinity of a solution. pH is calculated by taking negative logarithm of hydrogen ion concentration.
[tex]pH=-\log [H^+][/tex]
pH values range from 1 to 14. Acids have a pH range from 1 to 6.9, water is neutral with pH of 7 and bases have pH ranging from 7.1 to 14.
Acids form hydrogen ions when dissolved in water and bases form hydroxide ions when dissolved in water. Water [tex]H_2O)[/tex] is amphoteric and thus can behave as an acid or a base.
[tex]H_2SO_4\rightarrow 2H^++SO_4^{2-}[/tex]
[tex]Ca(OH)_2\rightarrow Ca^{2+}+2OH^[/tex]
Which of the following statements is TRUE about salts
Answer:
salt is salty in taste.......
what is a metal that forms two types of oxides and rusts in moisture
Answer:
An example of a metal that rusts is Iron
Answer:
Iron
Explanation:
The metal that forms 2 types in moisture is iron.
I need help with this question
heeeeeeeeeeeeeeelpheeeeeeeeeeeeeeelp
Answer:
the mirror forms a virtual inlarged image
Explanation:
What is radioactive dating?
A. A comparison of the energy emitted from nuclei based on age
B. The determination of how old a radioactive isotope is
C. The use of radioisotopes to determine the age of something
D. A process to determine the half-life of a radioactive isotope
Answer:
c. the use of radioisotopes to determine the age of something