CHEMISTRY HIGH SCHOOL

The euglena's red eyespot is used for _____.photosynthesis
binary fission
detection of light
detection of danger

Answers

Answer 1
Answer:

The euglena's red eyespot is used for detection of light.

Answer 2
Answer:

Answer:

binary fission

Explanation:

Related Questions

2. 7.5 g of potassium react with water to produce potassium hydroxide and hydrogen gas. Calculate the mass of potassium hydroxide produced. (8 points)
Which of the following substance is not an acid? 1. Substance A is tested and found to have a pH of 3. 2. Substance B, a common food, tastes sour. 3. Substance C causes metals to corrode. 4. Substance D feels slippery in solution.
How is the size of the mineral grains affected by the rate at which molten rock material cools?
Which nuclear emission has no charge and no mass?(1) alpha particle (3) gamma ray(2) beta particle (4) positron
A radioactive isotope has a half-life of 10 minutes.At the start of an experiment, the activity of a sample of this isotope was 800 countsper second after allowing for background radiation.Calculate how long it would be before the activity fell from 800 counts per second to200 counts per second.

All silicate minerals must contain atoms of which of these elements? select all that apply.a. carbon
b. silicon
c. oxygen
d. hydrogen

Answers

All silicate minerals must contain atoms of b.silicon and c. oxygen. These are largely rock minerals that comprise approximately 90 percent of the crust of the Earth. The minerals vary in the composition and structure or ratio of silicon and oxygen. 

Answer:

Silicon and oxygen

Explanation:

All silicate minerals must contain silicon and oxygen even though the name might mislead one into thinking it is only just silicon. Actually the suffix -ate in chemistry is used when an element is combined with oxygen. Which is why the carbonate ion has carbon and oxygen, the nitrate ion has nitrogen and oxygenThis repeats itself in the sulphate ion, phosphate ion, chromate ion, manganate ion etc.

What happens to the average kinetic energy of the water molecules in your body when you have a fever?

Answers

When you have a fever, the average kinetic energy of the water molecules in your body increases because the molecule's speed increases.

What is kinetic energy?

  • In physics, kinetic energy is the energy that an object has as a result of motion. It is defined as the amount of effort required to move a mass-determined body from rest to the specified velocity.
  • Unless the body's speedchanges, the kinetic energy gained during acceleration is retained.
  • Kinetic energy is the energy that an object has as a result of motion. To accelerate an object, a force must be applied to it.
  • We must exert effort in order to use force. When the work is completed, energy is transferred to the item, which moves at a new, constant speed.

To learn more kinetic energy, refer to:

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the speed of the molecule increses

With the help of a reaction show that zinc is more reactive than iron.

Answers

3Zn+2Fe^(3+)\rightarrow 3Zn^(2+)+2Fe

Suppose a 1.30 g nugget of pure gold has zero net charge. What would be its net charge after it has 1.68% of its electrons removed?

Answers

Answer:

The net charge of 1.3 g nugget of pure gold after 1.68% of its electrons are removed is 559 C

Explanation:

When an atom gains electrons it becomes negatively charged. Conversely, when it looses electrons the atoms becomes positively charged thus

To solve this question, we rely on the relationship between the nmber of particles present in a given mass of an atom, Avogadro's number and number of moles, n

The given variables are

mass of pure gold nugget = 1.30 g

Quantity of electrons removed = 1.68% of electrons present in the gold sample

Molar mass of gold = 197 g/mol

Avogadro's number = 6.02 × 10²³ atoms/mole  

qc = one electron charge = -1.06 × 10⁻¹⁹ C/electron

Electrical charge of gold nugget = 0 C

Number of electrons in one gold atom = 79 electrons

Solving for the number of prticles or gold atoms in 1.3 grams of gold we get

n mass/(molar mass) = 1.3/197 moles of gold =  0.0066 moles

number of particles in 0.0066 moles of gold N = n×N_(A) = 0.0066 × 6.02 × 10²³  = 3.97 × 10²¹ atoms

since 79 electrons are present per particle we have

3.97 × 10²¹ × 79 = 3.14 × 10²³ electrons

quantity of elecrtrons removed = 1.68% of  3.14 × 10²³ electrons =1.68/100 × 3.14 × 10²³ electrons = 0.0168 × 3.14 × 10²³ electrons = 5.3 × 10²¹ electrons

The net charge of 5.3 × 10²¹ electrons = 5.3 × 10²¹ electrons × -1.06 × 10⁻¹⁹ C/electron =

5.59 × 10² C = 559 C

Which of these 1 M solutions will have the highest pH?(1) NaOH (3) HCl(2) CH3OH (4) NaCl

Answers

Answer:

(1) NaOH

Explanation:

NaOH, sodium hydroxide is a base. HCl, hydrochloric acid is an acid. CH3OH, methanol is an alcohol. NaCl, sodium chloride is salt.  

pH below 7.0 is acidic, pH above 7.0 is basic, and pH at 7.0 is neutral.  

Since NaOH is the only base in among the given compounds, its pH will above 7.0. Therefore, NaOH will have the highest pH.  

Final answer:

NaOH solution will have the highest pH.

Explanation:

The solution with the highest pH would be the one that is basic, as basic solutions have higher pH values. Among the given options, NaOH is a strong base and dissociates completely in water to produce OH- ions, which makes the solution highly basic.

Learn more about pH of solutions here:

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A stream of negatively charged particles is called:

Answers

Cathode rays are a stream of negatively charged particles or electrons in vacuum tubes. They were first seen by Johann Hittorf in 1869. They are named since they are emitted by electrode or cathode. In order to release the electrons, the electrons should first be detached from the atoms of the cathode.
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The blue color of the sky results from the scattering of sunlight by molecules in the air. The blue light has a frequency of about 7.03 × 1014 Hz. Calculate the wavelength (in nm) associated with this radiation, and calculate the energy (in joules) of a single photon associated with this frequency. Enter your answers in scientific notation.
In which of the following is the number of neutrons correctly represented