Answer: There is 125 mL of a 2.0 M CuCl2 solution are needed to make 500 mL of a 0.5 M solution
Explanation:
Given: [tex]M_{1}[/tex] = 2.0 M, [tex]V_{1}[/tex] = ?
[tex]M_{2}[/tex] = 0.5 M, [tex]V_{2}[/tex] = 500 mL
Formula used to calculate the volume is as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}[/tex]
Substitute the values into above formula as follows.
[tex]M_{1}V_{1} = M_{2}V_{2}\\2.0 M \times V_{1} = 0.5 M \times 500 mL\\V_{1} = 125 mL[/tex]
Thus, we can conclude that there is 125 mL of a 2.0 M [tex]CuCl_{2}[/tex] solution are needed to make 500 mL of a 0.5 M solution.
Under Adolf Hitler, Germany violated the Treaty of Versailles by expanding its
military and occupying the Rhineland. How did the League of Nations respond to
these violations?
The League of Nations issued a declaration of war on Germany.
O The League of Nations condemned the violations but took no other action.
O The League of Nations imposed harsh sanctions on Germany.
The League of Nations sent a multinational peacekeeping force to the region.
Answer:
B. The League of Nations condemned the violations but took no other action.
Explanation:
Nazi leader, Adolf Hitler violated the Treaty of Versailles by sending German military forces in Rhineland. He not only violated the Treaty of Versailles but the Locarno Pact also.
The treaty was signed in 1919 to end the war between Germany and the Allied Powers.
Even after Adolf Hitler violated the treaty, the League Nations did not take any actions.
Therefore, option B is correct.
what is the use of connective tissue
Answer:
Explanation:
Major functions of connective tissue include: 1) binding and supporting, 2) protecting, 3) insulating, 4) storing reserve fuel, and 5) transporting substances within the body. Connective tissues can have various levels of vascularity.
Answer:
Connective tissues can have various levels of vascularity.
Explanation:
Which part of the scientific process is a proposed answer to a question?
1. observation
2. experiment
3. hypothesis
4. results
Scientific processes are the steps that are done to research and draw conclusions. The results of the experiments are the proposed answer to a question. Thus, option 4 is correct.
What are the steps of the scientific process?The scientific process initiates when there is a question that needs to answer and presented with observations and facts. It includes defining the question and making observations.
From the observations, the hypothesis is formed and an experiment is designed and conducted. From the research, the conclusion and the results are drawn.
Therefore, option 4. the proposed answer is called the result.
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Answer:
Hypothesis
Explanation:
Hypothesis is an educated guess as to what the answer to the question is.
(*) Sorry for my late answer but I hope this helps others that are looking for this.
I got 100% ;)
I need help for chemistry, I barely know English...
Answer:
6c12
Explanation:
For the combustion of acetaldehyde, CH2CHO, there is 42L at STP and 79g of Oz. How much water is produced?
What is the final volume of gas that initially occupies 2.50 L at 298 K and is subsequently heated to 321 K?
Answer: [tex]2.69\ L[/tex]
Explanation:
Given
The initial volume [tex]V_1=2.5\ L[/tex]
Temperature [tex]T_1=298\ K[/tex]
Final temperature [tex]T_2=321\ K[/tex]
Suppose pressure is constant for this process
[tex]\therefore \dfrac{V_1}{T_1}=\dfrac{V_2}{T_2}[/tex]
Insert the values
[tex]\Rightarrow \dfrac{2.5}{298}=\dfrac{V_2}{321}\\\\\Rightarrow V_2=\dfrac{321}{298}\times 2.5\\\\\Rightarrow V_2=2.69\ L[/tex]
A pacemaker:
A. sends electrical impulses to a prosthesis, causing it to move
through brain signals.
B. measures the distance traveled with a prosthetic leg.
C. tracks the speed traveled with a prosthetic leg and adjusts
movements accordingly.
D. sends electrical impulses to the heart, causing it to beat more
regularly
SUEMIT
how are living organisms in an ecosystem linked
Answer:
An environment is a local area of living creatures existing related to the nonliving segments of their current circumstance, interfacing as a framework. These biotic and abiotic segments are connected together through supplement cycles and energy streams.
Explanation:
Answer:
Living organisms require a proper, stable ecosystem/envirornment to function
Explanation:
2
A chart with the densities of four metals is shown.
Metal
Density (gicm')
Titanium
4.5
Zinc
7.1
Nickel
88
Silver
10.5
Students were given a sample of an unknown metal and told to determine
its density. They measured its mass as 26.4 g and its volume as 3.0 cm?
Use the chart to determine which metal the students were given.
Answer:
mass(m)=26.4g
volume (v)=3.0cm²
we have
density =m/v=26.4/3=8.8g/cm³
since it is equal to density of nickel.
Option C nickel is a required answer.
Answer:
[tex]\huge\boxed{\fcolorbox{green}{yellow}{option \: \: c}}[/tex]
help me pass this test my last day of school is may 26 if you don’t mind I have more questions :)
Answer:
equal
Explanation:
PLS HELP FOR FINAL!!!!!!!!!!!!!!
Answer:
The answer is Ernest Rutherford.
Answer :
Ernest RutherfordHope I helpGood Luck
How many protons, neutrons, and electrons are found in a neutral atom of hydrogen-333?
Answer:
Explanation:
A hydrogen atom has an atomic number of 1.
So it's proton number will always be 1.
A neutral hydrogen atom does not have any charge.
So it has the same amount of electrons as protons, which turns out to be also 1.
A neutral hydrogen atom has an atomic mass of ≈
1.00794 amu ≈ 1 amu.
To find the amount of neutrons, we take the proton number and subtract it from the mass number.
1 − 1 = 0
So a neutral hydrogen atom has no neutrons.
In summary,
A hydrogen atom has
1 proton
1 electron
0 neutrons
I hope that helps!
How would the number of atoms in a 2.02g sample of hydrogen compare to the number of atoms in a 32.00g sample of oxygen
Answer:
Number of atoms is equal.
Explanation:
1 mol of anything contains NA particles.
NA is known as Avogadro's number, 6.02×10²³
We determined the moles of each compound. Both molecules are dyatomic,
H₂ → 2.02 g . 1mol / 2.016 g = 1 mol
O₂ → 32 g . 1mol / 32g = 1 mol
Both have the same amount of moles.
In conclussion, the number of atoms is the same in both samples.
How much of a 10 M solution is needed to make 1 liter of a 1M solution?
a. 1ml
b. 1000ml
c. 10ml
d. 100ml
i dont know I hope someone knows soon take care
According to molar concentration, 100 ml of 10 M solution is needed to make 1 liter of a 1 M solution.
What is molar concentration?Molar concentration is defined as a measure by which concentration of chemical substances present in a solution are determined. It is defined in particular reference to solute concentration in a solution . Most commonly used unit for molar concentration is moles/liter.
The molar concentration depends on change in volume of the solution which is mainly due to thermal expansion. Molar concentration is calculated by the formula, molar concentration=mass/ molar mass ×1/volume of solution in liters.
In terms of moles, it's formula is given as molar concentration= number of moles /volume of solution in liters.In case of two solutions, molar concentration is found out by, M₁V₁=M₂V₂.
On substitution in above formula, V₁=1×1/10=0.1 L=100 ml.
Thus, 100 ml of a 10 M solution is needed to make 1 liter of a 1 M solution.
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what is the balanced equation of these two
(b) Mn2+ + 2 e- → Mn ℰ° = −1.18 V
Fe3+ + 3 e- → Fe ℰ° = −0.036 V
Answer:
(b) Mn2+ + 2 e- →2 Mn ℰ° = −1.18 V
Fe3+ + 3 e- → 3Fe ℰ° = −0.036 V
Un átomo neutro tiene número atómico 1 y número másico 3. Indica cuántos protones, neutrones y electrones tiene.
Answer:
El átomo podes 1 protón, 1 electrón y 2 neutrones.
Explanation:
Cada elemento químico se caracteriza por el número de protones de su núcleo, que se denomina número atómico Z. Es decir, el número atómico de un elemento químico es el número total de protones que tiene cada átomo de ese elemento.
Los protones poseen carga positiva y se encuentran en el núcleo, en torno al cual se mueven otras partículas con carga eléctrica negativa que son los electrones. Así, el átomo es eléctricamente neutro, ya que la carga positiva de los protones está compensada por la carga negativa de los electrones. Entonces, en todo átomo neutro el número de protones del núcleo es igual al de electrones de sus orbitales.
En este caso, un átomo neutro tiene número atómico 1. Entonces la cantidad de protones y electrones presentes en el átomo es 1.
En el núcleo de cada elemento, además de protones, también es posible encontrar neutrones, cuyo número puede variar. La masa atómica (A) se obtiene sumando el número de protones y de neutrones de un núcleo determinado:
Número másico (A) = número de protones + número de neutrones
En este caso, el átomo neutro posee 1 protón y su número másico es 3. Entonces:
3= 1 + número de neutrones
Resolviendo:
3 - 1= número de neutrones
2= número de neutrones
Entonces, el átomo podes 1 protón, 1 electrón y 2 neutrones.
A student dissolves 10 grams of sugar in enough water to make 25 ml of solution. What is the concentration of the solution
Answer: The concentration of given solution is 11.68 M.
Explanation:
Given: Mass of solute = 10 g
Volume of solution = 25 mL
Convert mL into L as follows.
[tex]1 mL = 0.001 L\\25 mL = 25 mL \times \frac{0.001}{1 mL}\\= 0.025 L[/tex]
Number of moles is the mass of substance divided by its molar mass. The moles of sugar (molar mass = 342.3 g/mol) is as follows.
[tex]No. of moles = \frac{mass}{molar mass}\\= \frac{10 g}{342.3 g/mol}\\= 0.0292 mol[/tex]
Molarity is the number of moles of solute present in a liter of solution.
Hence, concentration of given solution is calculated as follows.
[tex]Molarity = \frac{no. of moles}{Volume (in L)}\\= \frac{0.0292 mol}{0.025 L}\\= 11.68 M[/tex]
Thus, we can conclude that the concentration of given solution is 11.68 M.
A 5.0 mole sample of gas has 54 mmHg of pressure at 273K. What is the volume of the gas?
(Round your answer to the correct number of significant figures)
Answer:
here's the answer hope it helps
Rahul sits in a chair reading a book. Which force is equal to the force Rahul exerts on Earth?
Rahul’s weight
Rahul's mass
the sum of the weights of Rahul and the book
the sum of the weights of the chair, Rahul, and the book
Answer:
rahul's weight
Explanation:
internet
The force is equal to the force Rahul exerts on Earth is Rahul's weight.
What is Force?Force is that thing which cause a change in the motion of an object
What is force Rahul?Since Rahul sits on the chair, his weight exerts a downwards force towards the Earth which is the attraction of the Earth on Rahul. Now, Rahul also exerts a force of attraction on the Earth which is also equal to his weight, since according to Newton's third law which states that for every action, there is an equal and opposite reaction.So, Rahul exerts a force on the Earth equal to his weight.
Thus, the force is equal to the force Rahul exerts on Earth is Rahul's weight.
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Please help me I will really appreciate it !!!! And Please no links
Write a clear scientific explanation of how and why the water ended up on the mirror and not in the tub. Be sure to include scientific vocabulary (including any phase changes that occurred and the role of kinetic energy).
The Vocabulary words-
Condensation
Gas
Heat
Kinetic energy
Liquid
Steam
Vaporization
Water vapor
Explanation:
Steaming up or fogging happens when steam condenses on the mirror. Steam emerging from hot water can condense on a colder surface. That’s the reason you can see the result on a mirror instantaneously. Obviously, for a bathroom mirror to steam up, the steam that originates at the shower spray (or the bathtub) has to travel through the cooler air to reach the mirror. Since air tends to heat up easily, the mirror can steam up fast.
which of the following can not be guessed about the prehistoric organism by its fossil ?
Answer:
Evolution in the broadest sense explains that what we see today is different from what existed in the past. Galaxies, stars, the solar system, and earth have changed through time, and so has life on earth.Something that happened in the past is thus not "off limits" for scientific study. Hypotheses can be made about such phenomena, and these hypotheses can be tested and can lead to solid conclusions. Furthermore, many key aspects of evolution occur in relatively short periods that can be observed directly—such as the evolution in bacteria of resistance to antibiotics.Laws, like facts and theories, can change with better data. But theories do not develop into laws with the accumulation of evidence. Rather, theories are the goal of science.
Explanation:
which group/family of elements will most likely form ions with a charge of - or 1-?
Answer:
Re: Most likely charge for ions. Group 1 elements generally have a charge of +1 when they form ions, Group 2 has a charge of +2, Group 13 has a charge of +3. Group 17 has a charge of -1, Group 16 has a charge of -2, Group 15 has a charge of -3. So Rb would be +1, Ga would be +3, and S would be -2.
Explanation:
give me the type of reactions ___ CuCO3 → ___ CuO + ___ CO2
Determine the grams of water produced when 250 grams of barium hydroxide react
with 125 grams of HCI. Refer to the balanced equation below.
Ba(OH)2 (aq) + 2HCl (aq) --> 2H2O (l) + BaCl2 (aq) (balanced)
Answer:
Explanation:
Ba(OH)₂ (aq) + 2HCl (aq) --> 2H₂O (l) + BaCl₂ (aq)
171 g 2 x 36.5 g 2 x 18 g
73 g of HCl reacts with 171 g of Ba(OH)₂
125 g HCl reacts with 171 x 125 / 73 g of Ba(OH)₂
= 292.8 g of of Ba(OH)₂
Ba(OH)₂ available is 250 g , so it is the limiting reagent .
171 g of Ba(OH)₂ forms 36 g of water
250 g of Ba(OH)₂ forms 36 x 250 / 171 g of water
= 52.63 g of water.
If some salt were accidently spilled as it was transferred from the balance to the cup would your calculated enthalpy of solution of the salt be too high or too low
Answer:
It would be to low
Explanation:
If some salt were accidently spilled as it was transferred from balance to cup calculated enthalpy of solution of salt be too low as there will be loss in mass which would lead less solubility of salt and hence less enthalpy.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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1) What experimental condition is required for the heat change in a reaction to be numerically equal to the enthalpy change (ΔH)?
2) When 1 mol of nitrogen gas reacts with 3 mol of hydrogen gas, 2 mol of ammonia gas is produced and 92.6 kJ of heat is released. Write the thermochemical equation.
Answer:
Answers are in the explanation
Explanation:
1) The constant pressure is necessary during a reaction. Thus, the heat released in the reaction will be = ΔH
2) The reaction described in the problem is:
1 N₂(g) + 3H₂(g) → 2NH₃(g)
The thermochemical equation involves the change in heat, as 92.6kJ are released, the heat must be wrote as another reactant, that is:
N₂(g) + 3H₂(g) → 2NH₃(g) + 92.6kJWhat is a jet stream. in your own words but be more detailed about what you say.
(don't send a link)
Give three examples of energy traveling in waves
Answer:
ELECTROMAGNETIC SPECTRUM. Radios, televisions, mobile phones, and radar use signals made up of electromagnetic waves. These are waves that carry energy as electricity and magnetism at the speed of light. Light we can see is also an electromagnetic wave, but other types of electromagnetic wave are invisible.
Explanation:
~Hope this helps
down there (pls hurry!!)
What is the MOST important advantage of using ethanol as a fuel
for vehicles?
A. Ethanol reduces air pollution.
B. Ethanol mixes well with gasoline.
C. Making ethanol uses up plant products.
D. Making ethanol provides income for growers.
Answer:
The correct answer is - A. Ethanol reduces air pollution.
Explanation:
Ethanol is believed to be better fuel for the environment than other petroleum fuels. Ethanol emits lower carbon dioxide as it is clean smokeless fuel, and produces less or the same oxides of nitrogen and hydrocarbons.
It is produced by the process of fermentation of molasses by yeast. Mixing it with the other fuels is found to be CO2 reduces by 30% of emissions to the atmosphere.