Answer:
You may experience the sudden onset of one or more symptoms, such as: Numbness, tingling, weakness, or inability to move a part or all of one side of the body (paralysis). Dimness, blurring, double vision, or loss of vision in one or both eyes. Loss of speech, trouble talking, or trouble understanding speech.
Answer:
Stress, infection and changes in your blood's fluid and electrolyte balance can also influence hormone levels.
Explanation:
Which model shows a way that large molecules can enter a cell without using the cell's energy? Outside the cell O A Cell membrane Vacuole 1 2 Inside the cell В.
Answer:
its B
Explanation:
I took the test and its that passage way thing. (tell me if this works for you! it will but just wanna make sure!)
This tool is used to measure
Answer:
C. volume
Explanation:
Will give brainliest please help!!
Answer:
D. The energy level of the electron.
Explanation:
There are four quantum numbers which are used to describe the movement and paths or positon of each electron within an atom. Quantum numbers can be used to determine the electronic configuration of atoms and the most likely location of the atom's electrons. Quantum numbers are also used in determining other characteristics of atoms, such as ionization energy and the atomic radius.
The four quantum numbers are namely, principal, azimuthal, magnetic and spin quantum numbers.
Principal quantum numbers are denoted by the symbol ‘n’. They describe the principal electron shell or energy level the atom.The value of the principal quantum number are positive integer values that is equal to or greater than one. The value n = 1 represents the innermost electron shell of an atom, which corresponds to the lowest energy state of an electron. The larger the values of 'n' the greater the energy level and the farther the electron is from the nucleus.
Can y’all help with question 17
Answer:
7. Option 2. Atom 1 and Atom 4
8. The same number of valence electron
Explanation:
7. Determination of which symbol represent an isotope.
Isotopes are atoms having the same atomic number but different mass number due to the difference in the neutron number.
From the question given above, the following were obtained:
Z => atomic number
A => mass number
Atom >>> Isotope >>>>> Z >>>> A
1 >>>>>>> ¹⁷₇E >>>>>>>> 7 >>>> 17
2 >>>>>>> ¹⁷₈E >>>>>>> 8 >>>> 17
3 >>>>>>> ¹⁸₆E >>>>>>> 6 >>>> 18
4 >>>>>>> ¹⁸₇E >>>>>>> 7 >>>> 18
From the table above, only atom 1 and 4 has the same atomic number. Hence, atom 1 and atom 4 are isotopes.
8. To know the correct answer to the question, we shall write the electronic configuration of magnesium and calcium. This can be obtained as follow:
Mg (12) => 1s² 2s²2p⁶ 3s²
Valence electron => 2
Ca (20) => 1s² 2s²2p⁶ 3s²3p⁶ 4s²
Valence electron => 2
We can see that magnesium and calcium both have the same valence electron. Hence, they will have similar chemical properties.
3. How do we get mass from moles?
A. multiply by Avogadro's number
B. multiply by molar mass
C. divide by Avogadro's number
D. divide by molar mass
What is the molecular formula for this molecule? a
Answer:
In a molecular formula, it states the total number of atoms of each element in a molecule.
Explanation:
Which of the following effect increases the solubility of Ca(OH)2?
O Adding an acidic solution
O Adding KOH
O Adding solid CaCl,
O Adding solid NaOH
O Adding CaCO3
Answer:
adding an acidic solution
Explanation:
Strong acids dissociate completely in water and the H⁺ ions react with the OH⁻ ions to make H₂O. If we add an acid to our solution of Ca(OH)₂, the acid protons would react with some of the OH⁻ ions and drive the equilibrium to the right. More of the solid Ca(OH)₂ should dissolve.
What is reproduction?
How much 2 M HBr is needed to neutralize 380 mL of 0.1 M NH4OH?
Answer:
19ml
Explanation:
trust me
May someone assist, please...? I don't know how to do chemistry work...
1) How many mL of 5.00M CaSO4 solution must be
diluted with water to prepare 500.0 mL of 0.900M CaSO4?
2) 20.0 mL of a stock solution of NaOH is diluted with water to prepare 150.0mL of 1.50 M NaOH solution.
Calculate the Molarity of the stock NaOH solution?
3) 12.00 mL of 3.50 M NaOH solution is diluted with 88.0 mL of water.
What is the concentration of sodium hydroxide in the diluted solution?
4) 9.0 mL of 8.0 M HCl solution is diluted with water to prepare 0.50 M HCl solution. What is the final volume of this solution?
Answer:
1) 90.0 mL
2) 11.25 M
3) 0.477 M
4) 144 mL
Explanation:
The main formula that will be used for all these calculations is:
C₁V₁ = C₂V₂
C stands for concentration and V stands for volume and the subscripts 1 and 2 indicate an initial concentration or volume and a final concentration or volume.
For each problem, it's best to start by figuring out what you have and what you need to find. Figure out if you're looking for an initial value or a final value.
1) We need to find the initial volume. So, take what values you have and plug them in and then solve for whatever variable:
5.00 M · V₁ = 500.0mL · 0.900 M - divide by 5.00
C₁ = 90.0 mL
2) This time we're finding the initial concentration:
20.0mL · C₁ = 150.0mL · 1.50 M - divide by 20.0mL
C₂ = 11.25 M
3) Now we're finding the final concentration:
12.00mL · 3.50 M = 88.0mL · C₂ - divide by 88.0mL
C₂ = 0.477 M
4) Finally, we're looking for the final volume:
9.0mL · 8.0 M = 0.50 M · V₂ - divide by 0.50 M
V₂ = 144mL
A solution has a pH of 8.30. Determine the OH- concentration
Answer:
Explanation:
We know that
pH +pOH = 14
Given pH = 8.30
⇒ p0H = 14-8.30 = 5.70
Since, we know that
[tex]10^{-pH} = [H^{+}][/tex]
Given the equation:
Zn + 2HCl → ZnCl2 + H2
How many moles of HCl would be required to
produce a total of 2 moles of H2?
Answer:
4 moles of HCl will be required to produce 2 moles of H2.
Explanation:
A balanced chemical equation gives the stoichiometric ration of moles of reactants required to produce a certain number of moles of products. The ratio of moles of reactants to moles of products is known as the mole ratio and is constant for a given chemical reaction.
In the given balanced equation of reaction shown below:
Zn + 2HCl → ZnCl2 + H2
The mole ratio of HCl and H2 is 2:1. This means that in this reaction between Zinc metal and hydrochoric acid to produc zinc chloride and hydrogen gas, every two moles of hydrochloric acid used in the reaction will result in the production of one mole of hydrogen gas.
Therefore for two moles of H2 to be obtained from the reaction, twice the number of moles of HCl is required.
Moles of HCl required = 2 × 2 moles = 4 moles of HCl.
How many moles of carbon is 1.88 x 1025 carbon atoms?
Answer:
31.23 molesExplanation:
To find the number of moles in a substance given it's number of entities we use the formula
[tex]n = \frac{N}{L} \\[/tex]
where n is the number of moles
N is the number of entities
L is the Avogadro's constant which is
6.02 × 10²³ entities
we have
[tex]n = \frac{1.88 \times {10}^{25} }{6.02 \times {10}^{23} } \\ = 31.229235...[/tex]
We have the final answer as
31.23 molesHope this helps you
who discovered electron
Answer: Electricity
Answer:
J.J Thomas in 1897
_____H2 + _____O2 _____H2O
How many grams of water will you make from 7 moles of H2?
Answer:
126 g of H₂O
Explanation:
Firstly, we complete the equation:
2H₂ + O₂ → 2H₂O
If we have 7 moles of hydrogen, we assume, the oxygen is in excess.
Ratio is 2:2.
2 moles of hydrogen can produce 2 moles of water
Then, 7 moles of H₂ must produce 7 moles of water.
We convert moles to mass → 7 mol . 18 g/mol = 126 g
1. Which is true for any element?
A. Atomic number = number of protons + number of electrons
B. Atomic number = nun number of protons
C. Atomic number = number of protons + number of neutrons
D. Atomic number = nun number of protons, electrons, and neutrons
As a result of additional carbon dioxide in the atmosphere diffusing into the oceans, the water has become acidified. This is an example of:
Answer:
Ocean acidification
Explanation:
Ocean acidification is the progressive decrease in the pH of the oceans on Earth as the increasing amount of carbon dioxide CO₂ in the atmosphere which is due mainly to fossil fuel combustion, is dissolved into the oceans
Carbonic acid is formed when carbon dioxide, CO₂, in the atmosphere is dissolved in the ocean water to form carbonic acid as follows;
CO₂ + H₂O → H₂CO₃
H⁺(aq) ⇄ HCO₃⁻ (aq)
According to L e C h a t e l i e r ' s an increase in the amount of carbon dioxide in the atmosphere will result in more CO₂ dissolving into the oceans and forming more carbonic acid, HCO₃⁻ (aq), thereby increasing the acidity of the oceans which is equivalent to a reduction in the pH of the ocean waters.
Competition is rivalry between individuals for a particular resource.
Question 1 options:
True
False
Answer:
True
Explanation:
Competition is the act of competing with one another for a particular resource. An example is two animals quarrelling over a food or two people quarreling over who lost their money. Competing is a type of rivalry in which two people compete for one resource. The answer for this question is True.
The answer is TRUE. Competition is rivalry between individuals for a particular resource
Competition amongst individuals?
Competition can be described as an interaction between two individuals in which they both fight for the available resources in the environment.
For example, when there is limited source of food and water in an environment, the individuals or organisms present will struggle to take the available food in order to survive while those individuals that were unable to get this resource might end up dead as the available food is limited.
This also occurs in plants and they also compete for sunlight, food, water.
For more information on competition please see the link below:
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11 The cross section compares the densities of different Earth layers. Which Earth layer is most dense?
Answer:
b
Explanation:
i took the quiz
How many grams of strontium nitrate (Sr(NO3)2) contain 40 grams of oxygen atoms?
Answer:
88g of Sr(NO3)2 are present
Explanation:
To solve this question we must, as first, find the moles of oxygen. Based on the chemical formula of strontium nitrate, there are 6 atoms of oxygen per mole of strontium nitrate. Thus, we can find the moles of strontium nitrate and its mass as follows:
Moles Oxygen:
40g * (1mol / 16g) = 2.5 moles Oxygen
Moles Strontium nitrate:
2.5 moles Oxygen * (1mol Sr(NO3)2 / 6mol O) = 0.4167 moles Sr(NO3)2
Mass (Molar mass Sr(NO3)2: 211.63g/mol)
0.4167 moles Sr(NO3)2 * (211.63g / mol) =
88g of Sr(NO3)2 are presentOP
An increase in concentration (or pressure) increases rate of reaction
because...
B: the collision frequency is increased
A the arvaton energy is increased
D. All of these
there are more unsuccessful
collisions
Use the drop-down menus to identify the class of compounds to which each structure belongs.
The functional groups which are found in the molecules are responsible for their chemical reactions. Here the first organic compound is an acid, second one is an ether, third one is an alkyl halide and the fourth is an primary amine.
The functional groups in the field of organic chemistry can be defined as the substituent atoms or groups of atoms which are attached to the specific molecules. They have distinct features and properties and they are independent of the molecules they are attached to.
The compound with the functional group R-COOH is acid, R-O-R¹ is ether, R-X and R-NH₂ is a primary amine.
To know more about functional groups, visit;
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An echo is an example of a sound wave
answers:
A: refracting.
B: reflecting.
C: diffracting.
D: absorbing.
Answer:
B: reflecting
Explanation:
Sound waves can bounce off smooth
If an endothermic reaction begins at 26 degrees celsius and decreases by 2 degrees Celsius per minute, how long would it take to get to 0 degrees celsius?
Answer:
It would take 13 minutes.
Explanation:
The temperature decreases at a linear rate, meaning that we can describe the process by using the following formula:
T₂ = T₀ - 2*tWhere T₂ is the final temperature, T₀ is the initial temperature; and t is the elapsed time in minutes.
We input the data given by the problem:
0 °C = 26 °C - 2°C/min * tAnd solve for t:
t = 13 minWhat is the percentage by mass of copper in copper oxide (CuO)?
Answer:
79.89%
Explanation:
Copper has a molar mass of 63.55
Oxygen has a molar mass of 16.00
If you add these you get 79.55
To get the mass percent of copper divide copper by the whole. 63.55/79.55*100= 79.89%
What is the source of solar energy? electricity . solar panels the sun None of the above
Answer:
The Sun
Explanation:
Solar power is energy from the sun that is converted into thermal or electrical energy.
Answer:
The sun
Explanation:
The sun is the main source of solar energy.
2 C5H5 + Fe = Fe(C5H5)2
I need help with this question!!
Answer:
Fossil fuels..........
Mary is standing on a train moving east at 10 km per hour. Alicia is sitting on a train that passes in the opposite direction at 30 km per hour. From Mary's point of view, how fast is Alicia moving?
Help
Which describes the titration graph when a strong acid is titrated by a weak base?
It begins at a low pH and has an equivalence point of 7.
It begins at a low pH and has an equivalence point less than 7.
It begins at a high pH and has an equivalence point of 7.
It begins at a high pH and has an equivalence point greater than 7.
Answer:
the answer is b edg 2021
Explanation:
it just is