Answer:
carbon 12 6 6
Explanation:
Help me pls I will mark you as brain
Answer: Is it sewage checks
Write the law of conservation of matter…
(Please Answer fast)
Answer:
The Law of Conservation of Matter states that matter cannot be created or destroyed. In a physical change, substances can change form, but the total mass remains the same. In a chemical change, the total mass of the reactants always equals the total mass of the products. Materials.
What happens when water reaches its boiling point?
Answer:
khi sôi nhiệt độ của nước đạt 100oC, đến lúc này một phần nước sôi sẽ biến thành hơi nước, hơi nước sẽ đùn lên phá vỡ mặt nước và bốc hơi vào không khí, hình thành lên hiện tượng sôi của nước. Nước sôi đánh dấu mốc chuyển đổi trạng thái từ nước (thể lỏng) sang hơi nước (thể khí).
Explanation:
1. A sample of nitrogen occupies a volume of 250 mL
at 298 K. What volume will it occupy at 268 K?
Answer:
0.225 L = 225 mL
Explanation:
Charles' Law states that for a fixed pressure, the volume is directly proportional to the temperature, which means things expand at the same rate as the rate of it being heated up
Mathematically, we can write that as:
V1/T1 = V2/T2, where 1 and 2 are the two situations
So, when we substitute the values in, we get:
0.25 L/298 K = V2/268 K
Rearranging this, we get:
(0.25/298) x 268 = 0.225 L = 225 mL.
This also makes sense, as the volume reduced a little when the temperature reduced (cooled down)
Let me know if this makes sense, and hope I helped! :)
Answer this question will give brainliest
Answer:
heat energy
Explanation:
heat give energy so heat carriers energy
PLEASE HELPP!!!!
What kind of metal is Cu?
Alkaline Earth Metal
Alkali Metal
Transition Metal
Answer:
transition metal
Explanation:
Answer:
Copper is a Transition metal.
Explanation:
Use the periodic table website! It tells you what kind of metals the elements are and if they are metals or nonmetals.
Website: ptable.com
PLEASE HELP!!
Which element in Fe(NO3) is a metal?
O
N
Fe
Answer:
Explanation:
Most periodic tables have a staircase thick line on their right side. This line separates the metals from the non metals.
O (oxygen) and N (nitrogen) are on the right side of the staircase.
Fe is on the left.
Those elements on the right side of the staircase are non metals.
Those elements on the left of the staircase are metals, so Fe is a metal.
Describe the journey that a carbon atom inside a fossil fuel will take to become a carbon atom inside a plant
When fossil fuels are burnt, CO2 is released into the air and is taken up by plants during photosynthesis to form glucose and subsequently starch.
Fossil fuels contain a large proportion of carbon atoms. When fossil fuels are burnt, these carbon atoms are released as carbon dioxide and escape to the atmosphere as atmospheric CO2 in air.
Recall that plants take up the CO2 in air during the process of photosynthesis. This CO2 becomes combined with water in the presence of sunlight to form glucose.
This glucose is converted to starch and stored in plant tissues. This is how the carbon atom inside a fossil fuel becomes a carbon atom inside a plant.
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what is the process that causes the seafloor to rise during a subduction zone earthquake?
Answer:Seafloor spreading is a geologic process in which tectonic plates—large slabs of Earth's lithosphere—split apart from each other. Seafloor spreading and other tectonic activity processes are the result of mantle convection. ... The less-dense material rises, often forming a mountain or elevated area of the seafloor.
Explanation:
Brainliest pls
a regular solid box has a length of 5cm a width of 2cm and a height of 3cm what is the volume of the box
Volume of the regular solid = l × w × h
= (5 cm × 2 cm × 3 cm)
= 30 cm³
using the standard enthalpies of formation, what is the standard enthalpy of reaction?
Answer:
This equation essentially states that the standard enthalpy change of formation is equal to the sum of the standard enthalpies of formation of the products minus the sum of the standard enthalpies of formation of the reactants. and the standard enthalpy of formation values: ΔH fo[A] = 433 KJ/mol.
Explanation:
Hope this helps.
Which term names a property of a mineral? (I'm sorry if this says Chem. I couldn't find Sci. on the list)
Answer:
Naturally occurring
Explanation:
please mark me brainliest
Answer:
Streak
Explanation:
Streak is the microscopic remains of minerals in powder form after being rubbed with porcelain plates. The streaks do not have orderly arranged lattice structure or unit cells.
They are randomly arranged and microscopic size powders. The streak of minerals cannot be distinguished easily as it mostly appears similar for all minerals.
Thus, among the given options streak is one in the property of minerals. We can rely upon streaks as it cannot be easily affected by impurities.
Letter C shows that some of the heat rising from the earth's surface is trapped by gases in the atmosphere and reflected back to earth. This is known as what?
options:
Coriolis Effect
Solar Flares
Green House Effect
Windshield Effect
How many total atoms are in this formula?
2MgSO4
You are given an unknown solution, which contains both aqueous barium ion, Ba2+ (aq), and aqueous lead(II) ion,
Pb²+ (aq). Which of your six solutions would allow separation of the ions?
Select all that apply.
A. Ammonium chloride, NH4Cl(aq)
B. Iron(II) nitrate, Fe(NO₂)(aq)
C. Nickel(1) chloride, NiCl(aq)
D. Silver nitrate, AgNO₂(aq)
E. Sodium hydroxide, NaOH(aq)
F. Sulfuric acid, H₂SO,(aq)
Given the six solutions, the solution that will separate aqueous barium ion and aqueous lead(II) ion is ammonium chloride.
In qualitative analysis, it is common to separate substances in solution by introducing a solution that preferentially precipitates one of the ions in solutions while leaving the other one in solution.
In this case, we know that all chlorides are soluble except those of lead, mercury and silver according to the solubility rules. Hence, if ammonium chloride is added to a solution of aqueous barium ion and aqueous lead(II) ion, lead II chloride is preferentially precipitated hence the ions are separated.
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1. You were tasked to check if the liquid sample you have is a substance or a mixture.
Which among these tasks is the BEST way to do so?
1. Color comparison
Il. Taste comparison
III. Boiling Test
iv.
Melting Test
Answer:
boiling test or melting test
Explanation:
the energy of an electron in a multielectron atom is determined by
Answer:
by principal quantum number (n) and azimuthal quantum number (l)
Explanation:
I used the web to answer so I'm not sure if this is right
how many neutrons are in the stable isotope of rhenium
Properties of Rhenium-185 Isotope:
Properties of Rhenium-185 Isotope: RHENIUM-185
Neutron Number (N) 110
Atomic Number (Z) 75
Mass Number (A) 185
Nucleon Number (A) 185
25 more rows
What is empirical evidence
A retest of experimental results to make them reliable
Knowledge gained by observation or measurement
A prediction of test results before an experiment
A conclusion derived from evidence and logical reasoning
Which is a chemical property of hydrogen?
A.
It is a light gas.
B.
It is a combustible gas.
C.
It is a colorless gas.
D.
It has a boiling point of -252.87°C.
E.
It is a good conductor of electricity.
Answer:
CExplanation:
It is a colorlessI hope you help by my answee
Calculate the medullary index of a hair whose diameter is 110
microns wide and whose medulla measures 58 microns. Is this
a human or animal hair?
The medullary index of hair is the ratio of medullary diameter to the diameter of hair. Thus the medullary of hair with 110 microns and medulla diameter of 58 microns is 0.533. This is an animal hair.
What is hair medullary index?Medullary index of hair is the ratio of diameter of the medullary part and the diameter of the hair strand. From this value, we can identify whether the sample hair is of humans or animals.
Hair is made proteins called keratin. The protein structure of hair vary from human to human even one hair strand to the other and similar way it is different in animal hair too.
The hair strand of humans are thin than the hair strands of animals. Thus the medullary index of humans is 0.333 or less. If the index is 0.50 or greater it is of animals.
Here the diameter of hair is 110 microns and that of medulla is 58 microns thus medullary index is 58/110 = 0.55 microns. Which means that it is an animal hair.
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A dog has a mass of 12 kg. What is its weight? Round your answer to tr
The dog weighs
NA dog has a mass of 12 kg. What is its weight? Round your answer to the nearest whole number.
The dog weighs
N.
Answer:
118
Explanation:
describe in your own words the structure of solid sodium chloride and explain why it is formula is NACL
Answer:
Sodium chloride is formed when sodium atoms interact with chlorine atoms. When this occurs, sodium will donate an electron (which is a negatively-charged particle) to chlorine. This makes sodium slightly positive and chlorine slightly negative.
Opposite charges attract, right? So then, sodium ions will attract chloride ions and form an ionic bond. By the way, chloride is the term used to designate the anion form of chlorine. The result is a crystallized salt that has properties that are different from the two parent elements (sodium and chlorine). The chemical formula for sodium chloride is NaCl, which means that for every sodium atom present, there is exactly one chloride atom.
is the formation of the grand canyon a physical or chemical change
Answer:
Its a physical change I believe
Explanation:
Please help!!!
When magnesium hydroxide, Mg(OH)2, is added to water it...
Select one:
a. falls to the bottom of the beaker undissolved.
b. reacts with the water to form Mg(OH)4
c. produces an acidic solution.
d. dissociates into Mg+2 and (OH)4
Answer:
B
Explanation:
i think it is b Intermediate Mg(OH) reacts with H2O to form the reaction products H2 and Mg(OH)2. There are two kinds of reaction channels.
2. What are core elections? How are they represented in the shorthand electron configurations?
Answer:
In shorthand electron configuration, the electron configuration starts with the symbol of the noble gas in the previous period, followed by the additional configuration of the electrons for the given element. For example, aluminum has the atomic number 13, which is the number of protons in the nuclei of its atoms.
Explanation:
Hope this helps.
A gas under constant pressure has a volume of 30.57 m and a
temperature of 59.0 K. A change in temperature caused the
volume to change to 21.14 m². Based on the relationship
between volume and temperature, what must have happened to
the temperature?
Considering the relationship between volume and temperature, a gas under constant pressure can only have its volume reduced as a result of a decrease in its temperature.
According to Charles law, at constant pressure, the volume of a gas is directly proportional to its absolute temperature. Thus:
V1/T1 = V2/T2 where V1 = intial volume, V2 = final volume, T1 = initial temperature, and T2 = final temperature.
In this case, T1 = 59.0, V1 = 30.57, and V2 = 21.14
T2 = 21.14 x 59/30.57
= 20.05 K
It can be seen that the temperature of the gas has reduced from 59.0 K to 20.05K.
More on gas laws can be found here: https://brainly.com/question/1190311
I need the anwer plz helppp this question is worth 25 point
Explanation:
Enzyme X works on sugar C substrate.
microfilaments are composed of ____________ in ____________ arrangement.
Explanation:
microfilaments are composed of repeating actin subunits in a thin double-helix arrangement.
when a solution is diluted, what happens to the number of moles of solute in the diluted solution.
Answer: The amount does not change.
Explanation: