Answer: D. 6.2 Na
Explanation: Just took the test
Proteins are polyamides of
amines
alpha-amino acids
carboxylic acids
beta-amino acids
What is the process when oceans and lakes collect water that has fallen (water cycle)
The water cycle is the endless process that connects all of that water. It joins the Earth's oceans, land, and atmosphere. The Earth's water cycle began about 3.8 billion years ago when rain fell on a cooling Earth, forming the oceans. ... Precipitation that falls onto land flows into rivers, streams, and lakes.
The water moves from one reservoir to another, such as from river to ocean, or from the ocean to the atmosphere, by the physical processes of evaporation, condensation, precipitation, infiltration, surface runoff, and subsurface flow. In doing so, the water goes through different forms: liquid, solid (ice) and vapor.
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A sample of magnesium weighs 64.65 grams. How
many moles are in this sample? (Show work)
Answer:
2.65939942411 ( Round if needed)
Explanation:
The reason it is this is because, one mole of magnesium weighs 24.31 grams. So if you know that, then you would do 64.65 grams divided by 24.31 grams to get you a final amount of 2.65939942411 moles.
A doorbell uses an electromagnet for its operation.
Question 7 options:
True
False
Explanation:
The heart of the doorbell is an electromagnetic so yeah it does.
The compound made of chlorine and oxygen that has been used to kill anthrax spores in contaminated buildings is 52.6% Cl. What is its empirical formula
This problem is describing the percent composition of a compound formed by chlorine and oxygen, whereas the former has a percent composition of 52.6 % and asks for the empirical formula.
In this case, according to the given information, it turns out firstly possible to realize, that the percent composition of oxygen will be 47.4 % as both must sum 100 %.
Next, for the determination of the empirical formula, we can assume this percents as masses, to calculate the moles of each atom in the formula:
[tex]n_{Cl}=52.6gCl*\frac{1molCl}{35.45gCl}=1.484molCl\\\\n_{O} =47.4gO*\frac{1molO}{16.0gO} =2.963molO[/tex]
After that, we divide the moles of both Cl and O by 1.484 (moles of Cl), in order to calculate the mole ratios which also provide the subscripts in the empirical formula:
[tex]Cl:\frac{1.484}{1.484}=1\\\\O:\frac{2.963}{1.484}=2[/tex]
Hence, the formula is:
[tex]ClO_2[/tex]
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https://brainly.com/question/20053584https://brainly.com/question/2070746When magnesium hydroxide reacts with nitric acid, it produces magnesium nitrate and water.
Mg(OH)2 + 2HNO3 → Mg(NO3)2 + 2H2O
In one to two sentences, explain how this reaction demonstrates that matter is neither created nor destroyed in a chemical reaction.
Answer:
The law of conservation of mass states that mass is neither created nor destroyed but the mass of the system must remain constant over time. The total number of atoms in the reactants is equal to the total number of atoms in the product. Therefore, this chemical equation shows that energy is conserved and demonstrates the law of conservation of mass.
The given chemical equation, the total number of the magnesium, hydrogen, oxygen and nitrogen in the reactant is same in the product too.
Law of conservation of mass:
Mass is neither created nor destroyed but the mass of the system is always remain constant in the reaction.
The total number of atoms in the reactants must be equal to the total number of atoms in the product of a reaction.
For example-
[tex]\bold {Mg(OH)_2 + 2HNO_3 \rightarrow Mg(NO_3)_2 + 2H_2O}[/tex]
The total number of the magnesium, hydrogen, oxygen, and nitrogen in the reactant is same in the product too.
Therefore, the given chemical equation, the total number of the magnesium, hydrogen, oxygen and nitrogen in the reactant is same in the product too.
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Which statement about diluted solutions is false? When a solution is diluted
A. the concentration of the solution decreases.
B. the molarity of the solution decreases.
C. the number of moles of solute remains unchanged.
D. the number of moles of solvent remains unchanged.
When a solution is diluted, the concentration of solution increases, as first statement is false, the correct option is A.
What is a solution?A liquid mixture in which the minor component i.e., the solute is uniformly distributed within the major component i.e., the solvent is referred to as a solution.
A dilute solution is one where a small portion of solute is dissolved in the solution. A concentrated solution contains a significant amount of solute.
Thus, the correct option is A.
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What is a benefit of the
development of the cell
theory?
A. Cells have made microscopes get
better.
B. There are less biologists today
C. There is more disease on Earth now.
D. Scientists now know much more
about cells and bacteria which is a
benefit to all humans
Answer:
D
Explanation:
D because scientists study cells to know how to help people when they are sick
hope this helps (it might be wrong)
define the term alotropy
Answer:
The term allotrope refers to one or more physical forms of a chemical element that occurs in the same physical state. Allotropes may show differences in chemical and physical properties. Swedish chemist Jons Jakob Berzelius proposed the concept of allotropy in 1841.
explanation
i searched it ;)
The nucleus of a atom is
I got it wrong plsss someone help me
The volume of the balloon when the temperature is increased to 100 °C is 11.5 L
From the question given above, the following data were obtained:
Initial volume (V₁) = 9 L
Initial temperature (T₁) = 20 °C = 20 + 273 = 293 K
Final temperature (T₂) = 100 °C = 100 + 273 = 373 K
Pressure = constant
Final volume (V₂) =?The final volume of the balloon can be obtained by using the Charles' law equation as illustrated below:
V₁ / T₁ = V₂ / T₂
9 / 293 = V₂ / 373
Cross multiply
293 × V₂ = 9 × 373
293 × V₂ = 3357
Divide both side by 293
V₂ = 3357 / 293
V₂ = 11.5 LThus, the final volume of the balloon is 11.5 L
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At 1.05 atm and 11.15 °C, a 2.68 g sample of gas occupies a volume of 1830 mL. Calculate the molar mass of the gas.
Answer:
2.12g/mol
Explanation: quick maths
What is the pH of a solution with [OH-] = 1 x 10-4 M?
because we are given the concentration of the hydroxide ion(OH⁻), we will first find the the concentration of [H⁺] ions and find the pH from there.
Finding the concentration of H⁺ ions:
we know the relation:
[OH⁻]*[H⁺] = 10⁻¹⁴ [square brackets denote the concentration]
(10⁻⁴)[H⁺] = 10⁻¹⁴
[H⁺] = 10⁻¹⁰ [multiplying both sides by 10⁴]
Finding the pH:
pH = -log[H⁺]
pH = -log(10⁻¹⁰)
pH = 10
Answer:
given:
abcissa(x-coordinate) of given point: -6
let's say the ordinate(y-coordinate) of the given point is y
distance of the given point from (1,3) = √74
we can rewrite the given information as:
the distance between the points (-6,y) and (1,3) is √74
finding y:
we know that in order to find the distance between any two points, we use the distance formula, which goes as
Which are examples of a phase change? (Select all that apply.)
evaporating water
cutting wood
frying eggs
melting butter
Answer:
melting butter and frying eggs
Explanation:
Hope this helps please mark me brainliest
What happens as a liquid freezes?
O A. The average kinetic energy decreases.
OB. The average kinetic energy increases.
O C. Heat energy is absorbed.
O D. Heat energy is released.
Answer:
The average kinetic energy decreases.
the atomic number of f plus the atomic number of Na equals the atomic number of this element
Answer:
Atomic no. of Fluorine =9
Atomic no. of Na=11
Therefore,
Atomic no. of x element=9+11=20
Therefore
,Element=Calcium
Please please help please help me please please help me
Answer: the left group is the alkali metals while in the right side its the halogens... up to you to pick. either A or D
Explanation:
A student added 0.90 mL of 0.50 M NaOH, 0.70 mL of 1.0 M HA, and 0.40 mL water to their trial 1. How many moles of NaOH did they add
There are 0.00045 moles of sodium hydroxide that were added in the solution.
From the question, we have the following information;
Volume of sodium hydroxide = 0.90 mL or 0.00009 L
Concentration of sodium hydroxide = 0.50 M
We know that;
Number of moles = volume of solution × concentration of solution
Substituting values;
The number of moles of sodium hydroxide added = 0.9/1000 L × 0.50
= 0.00045 moles
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What prediction can the student make about the new substances properties? A. The resulting substance will not have any chemical or physical properties in common with the elements that make it up. B. The resulting substance may have different chemical and physical properties than the elements that make it up. C. The substance should be colorless and a gas at room temperature, like hydrogen and oxygen. D. The resulting substance should be black and a solid at room temperature, like carbon.
Answer:
B
Explanation:
The resulting substance may have different chemical and physical properties than the elements that make it up.
The prediction can the student make about the new substances properties is the resulting substance may have different chemical and physical properties than the elements that make it up. Thus, option B is correct.
Physical and chemical changes are two different types of changes that can occur to matter. A physical change is a change in the form or appearance of a substance, but the chemical composition of the substance does not change. A chemical change is a change in the chemical composition of a substance, resulting in the formation of a new substance.
When wood burns, it reacts with oxygen in the air to form carbon dioxide and water vapor. The chemical composition of the wood changes, and a new substance is formed.
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HELP 100 POINTS GIVING BRAINLIEST
Answer:
it is the answer
Explanation:
Six hundred men, six hundred men under my command
With only one goal in mind
Make it back alive to our homeland
Six hundred men, six hundred miles of open sea
But the problem's not the distance
It's what lies in between
And Ithaca's waiting Ithaca's waiting
My kingdom is waiting The kingdom is waiting
Penelope's waiting for me
So full speed ahead, full speed ahead
I want to see how smart y'all are fwee points
What is a physical and chemical change?
Answer:
Physical change is basically a change in where an object can easily return to its original state somehow as long as it’s possible but a chemical change is a change in which there is now simple way to change a substance back to original form. Basically (in simple words) chemical changes literally make something entirely new.
Explanation:
Physical changes come for example when you rip paper. You can easily fix it right up with some tape.
Chemical Changes is like rust on a bike or paper being burned. If that paper bein burned in flames you can’t put tape on the ashes and start writing on it like nuthin happend lol
PLEASEEE HELPPP MEEEEEEEEEEEE
Can you please help me on these
Answer:
Surface weathering, I believe
Explanation:
Suppose that 0.473 g of an unknown gas that occupies 200. mL at 1.81 atm and 25 8C was analyzed and found to contain 0.414 g of nitrogen and 0.0591 g of hydrogen. (a) What is the molecular for- mula of the compound
The molecular formula of the compound is N₂H₄
we'll begin by calculating the number of mole of the unknown gas. This can be obtained as follow:
Volume (V) = 200 mL = 200 / 1000 = 0.2 L
Pressure (P) = 1.81 atm
Temperature (T) = 25 °C = 25 + 273 = 298 K
Gas constant (R) = 0.0821 atm.L/Kmol
Number of mole (n) =?PV = nRT
1.81 × 0.2 = n × 0.0821 × 298
0.362 = n × 24.4658
Divide both side by 24.4658
[tex]n \: = \frac{0.362}{24.4658} [/tex]
n = 0.0148 moleNext, we shall determine the molar mass of the compound.mole of compound = 0.0148 mole
mass of compound = 0.473 g
molar mass of compound =?[tex]molar \: mass \: = \frac{mass}{mole} \\ \\ molar \: mass \: = \frac{0.473}{0.0148} \\ \\ [/tex]
Molar mass of compound = 31.96 g/molNext, we shall determine the empirical formula of the compound.Nitrogen (N) = 0.414 g
Hydrogen (H) = 0.0591 g
Empirical formula =?Divide by their molar mass
N = 0.414 / 14 = 0.0296
H = 0.0591 / 1 = 0.0591
Divide by the smallest
N = 0.0296 / 0.0296 = 1
H = 0.0591 / 0.0296 = 2
Therefore, the empirical formula of the compound is NH₂
Finally, we shall determine the molecular formula of the compound. This can be obtained as follow:Molar mass of compound = 31.96 g/mol
Empirical formula = NH₂
Molecular formula = ?Molecular formula = Empirical formula × n = Molar mass
[NH₂]n = 31.96
[14 + (2×1)]n = 31.96
16n = 31.96
Divide both side by 16
n = 31.96 / 16
n = 2
Molecular formula = [NH₂]n
Molecular formula = [NH₂]₂
Molecular formula = N₂H₄Thus, the molecular formula of the compound is N₂H₄
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The boiling point of benzene is 80ºC. Which pair of samples will have the same average kinetic energy as benzene molecules?
· a sample of liquid benzene at 80ºC and a sample of gaseous benzene at 80ºC
· two samples of gaseous benzene, one at 80ºC and the other at 90ºC
· a sample of liquid benzene at 70ºC and a sample of gaseous benzene at 90ºC
· two samples of liquid benzene, one at 70ºC and the other at 80ºC
Answer: A. a sample of liquid benzene at 80ºC and a sample of gaseous benzene at 80ºC
Explanation:
An empty container with a volume of 140.0 cm3 is weighed and found to have a mass of 73.3 g. The container is filled with a liquid and reweighed. The mass of the container and the liquid is 192.1 g. What is the density of the liquid to the appropriate number of significant figures
Answer:
0.420 g/ml
Explanation:
Question
An empty container with a volume of 140.0 cm3 is weighed and found to have a mass of 73.3 g. The container is filled with a liquid and reweighed. The mass of the container and the liquid is 192.1 g. What is the density of the liquid to the appropriate number of figures
density = mass/volume
d = (192.1 -73.3)/140.0 = 58.8/140.0 =0.420 g/ml
An empty container with a volume of 140.0 cm3 is weighed and found to have a mass of 73.3 g. The container is filled with a liquid and reweighed. The mass of the container and the liquid is 192.1 g.0.420 g/ml is the density of the liquid.
What is density ?The term density is defined as the mass of a substance per unit volume. density expressed in grams per cubic centimeter. The formula of density is as follows:
Density = mass/ volume
The density of something is a measure of how heavy it is in relation to its size. When an object is denser than water, it sinks; when an object is less dense than water, it floats. Density is a property of a substance that is independent of the amount of substance.
Given:
Volume = 140.0 cm³
Density = ?
mass = 73.3 g, 192.1 g.
density = mass/volume
density = (192.1 -73.3) / 140.0
= 58.8/140.0
=0.420 g/ml
Thus, The mass of the container and the liquid is 192.1 g.0.420 g/ml is the density of the liquid.
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An alkene with the molecular formula C10H18 is treated with ozone and then with zinc and acetic acid. The only product isolated from these reactions is:
The only product obtained from the ozonolysis of C10H18 with ozone and then with zinc and acetic acid is shown in the image attached.
The ozonolysis of alkenes is a reaction between an alkene and ozone which cleaves the alkene bond. The reaction proceeds through a molozonide and an ozonide intermediate which is highly unstable.
After the reaction of the alkene and ozone, zinc metal and acetic acid are used to reduce the ozonide to yield the product(s). The single product obtained by the ozonolysis of C10H18 is shown in the image attached.
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pls help me i really need the answer see it and do it
Answer:
Diffusion
Explanation:
How many grams of nickel(II) chloride do you need to precipitate 503 mg of silver chloride in the reaction between nickel(II) chloride and silver nitrate
From the information provided in the question, the mass of NiCl2 required is 0.23 g.
NiCl2(aq) + 2AgNO3(aq) -------> 2AgCl(s) + Ni(NO3)2(aq)
Number of moles of AgCl= Mass/molar mass
Molar mass of AgCl= 143 g/mol
Substituting values;
Number of moles = 503 × 10^-3g/143 g/mol= 0.00352 moles
Since 1 mole NiCl2 precipitates 2 moles of AgCl
x moles of NiCl2 precipitates 0.00352 moles of AgCl
x = 1 mole × 0.00352 moles/2 moles
x = 0.00176 moles of NiCl2
Mass of NiCl2= 0.00176 moles × 130 g/mol = 0.23 g
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at room temp, water is a liquid, but carbon dioxide is a gas. both compounds are molecules made of three atoms. what difference at the molecular level helps explain why water is a liquid and carbon dioxide is a gas at the same temp?
Explanation:
Water has relatively strong hydrogen bonds holding the molecules together but CO² has only dispersion forces acting as intermolecular forces. The weaker intermolecular forces explains why CO² is a gas whereas H²O is a liquid at room temperature.
Answer: Water has relatively strong hydrogen bonds holding the molecules together but CO2 has only dispersion forces acting as intermolecular forces. The weaker intermolecular forces explains why CO2 is a gas whereas H2O is a liquid at room temperature.
Explanation: I hope it helps you!
