Why are scientists worried that climate change will cause these toxic algae blooms to become more frequent?

Answer:

ionic bond, also called electrovalent bond, type of linkage formed from the electrostatic attraction between oppositely charged ions in a chemical compound. Such a bond forms when the valence (outermost) electrons of one atom are transferred permanently to another atom.

Explanation:

Answer:

B) ethanol

Explanation:

that is the answer I got it in my test

Answer:

s-2 p-6 d-10 f-14

Explanation:

s orbital max can fit 2 electrons

p orbital max can fit 6 electrons

d orbital max can fit 10 electrons

f orbital max can fit 14 electrons

Answer:

Electrons and protons are not positively charged

Explanation:

Neutrons are the only ones positively charged in the structure of an atom.... Also like charges repel which means a -ive and a - ive will repel when together

Answer:

Fear weakens our immune system and can cause cardiovascular damage. Fear can cause damage to some parts of our brains. Fear can interrupt processes in our brains that allow us to regulate emotions.

Explanation:

Hope this helps:)........if not then sorry for wasting your time and may God bless you:)

Answer: C

Explanation:

For the elementary reaction NO3 + CO ❝ NO2 + CO2 the molecularity of the reaction and the rate law is 2 and k[NO3][CO] respectively. Therefore, the correct option is A) 2, k[NO3][CO]

The quantity of responding molecules that collide simultaneously to produce a chemical reaction is known as the molecularity of a reaction. A chemical reaction's rate and the concentrations of the reactants involved are correlated by an expression known as the rate law, commonly referred to as the rate equation.

The molecularity of the reaction is 2 because there are two reactant molecules involved in the elementary reaction.

The rate law is rate = k[NO3][CO] because the rate of the reaction depends on the concentration of both reactants. Therefore, the correct answer is A) 2, k[NO3][CO].

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Answer:

S = d/t s = 400m/ 20 sec = 20m/s

Explanation:

To begin with, sucrose is C12H22O11. Additionally, we must determine how many moles of sucrose there are in a pound of sucrose:

The moles of sucrose are 454g, 342.30g, mol1, and 1.33mol.

Is sucrose a good sugar to use?

Brief Summary According to a University of California, Davis study that was published in the Journal of Clinical Endocrinology and Metabolism, sucrose, the more "natural form of sugar," may be just as harmful to your health as HFCS.

Is sugar a healthy food?

Your body only receives sugar when you consume sucrose like soda or candy, and typically too much of it. The threat is present here. You run the risk of major health problems if you consume too much added sugar (fructose or sucrose) in your diet.

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The Na+/K+ pump helps a muscle cell maintain a state of "resting membrane potential." The resting membrane potential is the difference in voltage across the cell membrane when the muscle cell is not actively contracting.

The Na+/K+ pump plays a crucial role in this process by actively transporting three sodium ions (Na+) out of the cell and two potassium ions (K+) into the cell.

This exchange creates an electrochemical gradient, resulting in a net negative charge inside the cell and a net positive charge outside the cell.

This gradient is essential for the proper functioning of muscle cells, as it allows them to respond to stimuli and initiate muscle contractions.

In summary, the Na+/K+ pump is essential for maintaining the resting membrane potential in muscle cells, ensuring their proper function and responsiveness.

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The flowchart for identifying alkaline earth cations involves four tests: hydrochloric acid, flame test, ammonium oxalate, and sodium sulfate. These tests should be carried out systematically to ensure accurate identification of the cation.

To begin, the first test involves the addition of hydrochloric acid to the unknown solution. If a white precipitate forms, the cation is either a group 1 or 2 metal ion. Next, to differentiate between the two, the second test involves the addition of a flame test. If a red flame is produced, the cation is a group 1 metal ion. If a yellow or orange flame is produced, the cation is an alkaline earth metal ion.

Following the flame test, the third test is used to identify the specific alkaline earth cation. This test involves adding ammonium oxalate to the unknown solution. If a white precipitate forms, the cation is either calcium or strontium. The fourth test involves the addition of sodium sulfate to the unknown solution. If a white precipitate forms, the cation is calcium. If no precipitate is formed, the cation is strontium.

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Answer:

The characteristic of silicon that is most closely related to its chemical reactivity is that;

It is found in nature in mainly as oxides and silicates

Explanation:

Silicon, which is a member of group 14 of the periodic table has the electron configuration of [Ne]3s²3p² and has a high affinity for oxygen such that the the oxides are known as silicates and it is almost impossible to find pure silicon in nature and it is found in the universe as silica and silicates

Silicate minerals make up over 90% of the Earth's crust such that, by mass silicon is only surpassed by oxygen as the most abundant element found in the Earth's crust.

Answer:

Explanation:

Example for Endothermic include melting ice cubes, cooking eggs, or baking breads.

Example for Exothermic include Burning candles, lighting match, or hot packs

Answer:

Explanation:

Here, we want to spell out the names of the elements present in the compound

There are three elements in the given compound

We have Mg, O and H

The names can be obtained from the periodic table of element

We have;

Mg - Magnesium

O - Oxygen

H- Hydrogen

Answer: I believe it is the number of protons.

The energy produced when two gaseous ions with opposing charges combine to form an ionic solid is referred to as lattice energy. An exothermic reaction occurs when the two ions attract one another, releasing energy. Coulomb's law is widely used to lattice energy, which can be fairly complex.

Lattice energy, according to the alternative definition, is the energy released during the opposing process of gaseous ions joining together to create an ionic solid. This process will always be exothermic, as suggested by the definition, and as a result, the lattice energy value will be negative. With more ion charge and shorter distances, lattice energy rises. More specifically, it rises through periods from left to right and from bottom to top for groups.

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Answer:

The initial volume of the balloon is 3.41 L.

Explanation:

The gas laws are a set of chemical and physical laws that allow determining the behavior of gases in a closed system. The parameters evaluated in these laws are pressure, volume, temperature, and moles.

As the volume increases, the gas particles (atoms or molecules) take longer to reach the walls of the container and therefore collide with them fewer times per unit of time. This means that the pressure will be lower because it represents the frequency of collisions of the gas against the walls. In this way pressure and volume are related, determining Boyle's law which says:

"The volume occupied by a certain gaseous mass at constant temperature is inversely proportional to pressure"

Boyle's law is expressed mathematically as:

Pressure * Volume = constant

or P * V = k

Now it is possible to assume that you have a certain volume of gas V1 that is at a pressure P1 at the beginning of the experiment. If you vary the volume of gas to a new value V2, then the pressure will change to P2, and it will be fulfilled:

P1 * V1 = P2 * V2

In this case:

Replacing:

0.53 atm* V1= 0.42 atm* 4.3 L

Solving:

\(V1=\frac{0.42 atm* 4.3 L}{0.53 atm}\)

V1= 3.41 L

The initial volume of the balloon is 3.41 L.

Answer:

blurred an pic mo paki ayos

One of the flaws of this solution is that because it is programmed at night data loss is possible if a failure occurs at this time.

This is used to save important information or date from a device such as a computer periodically.

Tape cardridge backup is the best option if a lot of data has to be saved because they are efficient and low cost.

The only problem is that because the back up is automatically programmed at night, a failure such as a problem in electricity implies valuable data might be lost.

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Therefore, 0.00723 moles of Na3C6H5O7 can be produced if one tablet containing 0.0217 mol of NaHCO3 is dissolved.

The balanced chemical equation shows that 3 moles of NaHCO3 react with 1 mole of H2C6H6O7 to produce 1 mole of Na3C6H5O7. Therefore, the number of moles of Na3C6H5O7 produced is directly proportional to the number of moles of NaHCO3.

If one tablet containing 0.0217 mol of NaHCO3 is dissolved, then according to the balanced chemical equation, the number of moles of Na3C6H5O7 produced is:

(0.0217 mol NaHCO3) x (1 mol Na3C6H5O7 / 3 mol NaHCO3) = 0.00723 mol Na3C6H5O7

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The boiling point of salt water is greater than that of fresh water hence the electrostatic forces between molecules in salt water is greater than that between the molecules in salt water.

Fresh water contains does not contain dissolved solutes like salt water. Salt water contains a lot of dissolved mineral salts making the salt water to be rich in ions.

Generally, the boiling points of substances can serve as a measure of the strength of electrostatic forces between molecules in either kind of water. We will easily find the that the boiling point of salt water is far higher than that of fresh water indicating greater electrostatic forces between molecules in salt water than between molecules in fresh water.

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The pH values of the solution after the addition of various amounts of acids are as follows:

(a) When 0.0 mL HCl is added; pH = 11.62

(b) After adding 10.0 mL of 0.100 M HCl; pH = 12.38

(c) After adding 30.0 mL of 0.100 M HCl; pH = 14

(d) After adding 40.0 mL of 0.100 M HCl; pH = 2.70

The equation of the reaction between NH₃ and HCl is:

NH₃ + HCl → NH₄Cl

Before the addition of HCl:

The concentration of NH₃ solution = 0.300 M

The initial concentration of OH- can be calculated from the Kb of NH₃ :

Kb = [NH₄⁺][OH⁻] / [NH₃]

1.8 x 10⁻⁵ = x² / 0.300

x = 0.0024 M

The initial concentration of OH⁻ is 0.0024 M, and the initial pH of the solution ill be:

pH = 14 - pOH

pH = 14 - (-log[OH-])

pH = 11.62

(a) When 0.0 mL HCl is added;

pH = 11.62

(b) After adding 10.0 mL of 0.100 M HCl;

moles of HCl added = (0.100 mol/L) x (0.0100 L)

moles of HCl added = 0.00100 mol

The moles of NH₃ initially present = (0.300 mol/L) x (0.0100 L)

moles of NH₃ initially present = 0.00300 mol

the mole ratio of HCl and NH₃ = 1:1

The remaining moles of NH₃ = 0.00300 mol - 0.00100 mol

remaining moles of NH₃ = 0.00200 mol

The volume of the solution is now 10.0 mL + 10.0 mL = 20.0 mL or 0.0200 L.

The new concentration of NH₃ = 0.00200 mol / 0.0200 L

concentration of NH₃ = 0.100 M

The concentration of OH- can be calculated from the Kb of NH₃ using the new concentration of NH4+:

Kb = [NH4+][OH-] / [NH3]

1.8 x 10⁵ = x² / 0.100

x = 0.0042 M

The new concentration of OH- is 0.0042 M, and the new pH will be:

pH = 14 - (-log[OH-])

pH = 12.38

(c) After adding 30.0 mL of 0.100 M HCl;

the volume of the solution is 40.0 mL or 0.0400 L

The moles of HCl added = (0.100 mol/L) x (0.0300 L)

moles of HCl added = 0.00300 mol

moles NH3 reacted = 0.00300 mol - 0.00300 mol

moles NH3 reacted = 0.00000 mol

[NH₄⁺] remaining [OH⁻] = 0

The concentration of OH- is 0 M, so the pH = 14 - (-log[OH-])

pH = 14

(d) After adding 40.0 mL of 0.100 M HCl;

moles HCl = (0.100 mol/L) x (0.0400 L)

moles HCl = 0.00400 mol

The volume of solution = 0.050 L

All NH₃ has reacted and the remaining moles of HCl = (0.00400 mol - 0.00300 mol) / 0.0500 L

the remaining moles of HCl = 0.00200 M

The concentration of H₃O⁺ can be calculated from the concentration of HCl:

0.00200 M HCl produces 0.00200 M H₃O⁺

pH = -log[H₃O⁺]

pH = -log(0.00200)

pH = 2.70

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Answer:

-8 m/s^2

Explanation:

The formula for acceleration is:

a= v^2 - v^1/t

a= acceleration

v^2- final velocity which in this case would be 0 since the jet comes to a stop.

v^1= original velocity which is 80 m/s.

t=time or 10s

Substitute the letters for the numbers and you get this:

a= 0 - 80/10

0 - 80= -80

-80 divided by 10 is -8.

Hope this helps! :)

Answer:

Similar properties

Explanation:

Potassium (K) has atomic number 19 which means its electron configuration (pattern of electrons in it's energy levels (electron shells)) is 2·8·8·1 while Copper (Cu) has atomic number 29 which means its electron configuration is 2·8·8·8·3 hence Potassium has 4 electron shells while Copper has 5

Potassium has 19 protons (from its atomic number) while Copper has 29 protons

The number of protons and electrons is usually the same (in an atom) (that's why atoms don't naturally have charges i.e they're usually neutral) so Potassium has about 19 electrons while Copper has about 29 electrons.

So similar properties automatically becomes your answer cuz the rest are wrong.

Answer:

Noble Gases B

Explanation:

The noble gases are the chemical elements in group 18 of the periodic table. They are the most stable due to having the maximum number of valence electrons their outer shell can hold. Therefore, they rarely react with other elements since they are already stable.

Answer:

Added

Explanation:

Force is a vector quantity. It follows vector law of addition.

If two forces act in the same direction, the angle between the two force vectors become zero and thus the resultant force turns out to be the algebraic addition of the applied individual forces.

Feq = √(F1²+F2²+2F1.F2.cos0) = √(F1+F2)² = F1+F2.

\(\\ \tt\leadsto pH=-log[H^+][/texM

\(\\ \tt\leadsto pH=-log[3.4\times 10^{-11}]\)

\(\\ \tt\leadsto pH=-log3.4-log10^{-11}\)

\(\\ \tt\leadsto pH=-0.53+11\)

\(\\ \tt\leadsto pH=10.47\)

Basic

Considering the definition of pH, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.

pH is the Hydrogen Potential. It is a measure of acidity or alkalinity that indicates the amount of hydrogen ions present in a solution or substance.

Mathematically, pH is calculated as the negative base 10 logarithm of the activity of hydrogen ions:

pH= - log [H⁺]= - log [H₃O⁺]

The numerical scale that measures the pH of substances includes the numbers from 0 to 14. The pH value 7 corresponds to neutral substances. Acidic substances are those with a pH lower than 7, while basic substances have a pH higher than 7.

In this case, you know [H₃O⁺]= 3.4×10⁻¹¹ M.

Replacing in the definition of pH:

pH= -log (3.4×10⁻¹¹ M)

Solving:

pH=  10.47

Finally, the pH of the solution is 10.47 and since it is higher than 7, it is a basic substance.

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Skeletal muscle was the Effector in the reaction time test and motor response reflects the muscular component of reaction time.

The Effector in the reaction time test was the skeletal muscle in the finger which is used to press the button. muscle and glands produces a specific response to a stimuli's and the motor response was reaction time test is the time between electromyographic activity and movement and the motor response is the response which reflects the skeletal muscle component of reaction time.

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