one isotope of a metallic element has a mass number of 65 and 35 neutrons in the nucleus. the cation derived the isotope has 28 electrons. write a nuclear symbol for this element

Answers

Answer 1

Answer: the electrons and protons would be the same amount than take the atomic mass-the atomic number get the answer that way

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Why is nonpoint source pollution potentially more harmful than point source pollution?a.Nonpoint source pollution disrupts the water cycle.
b.Nonpoint source pollution is difficult to regulate.
c.Nonpoint source pollution comes from more than one source.
d.Nonpoint source pollution is more damaging to living organisms than point source pollution

Answers

A, nonpoint souce pollution is "a main problem with water quality."

Edgeuity says the correct answer is B

Summarize the main contributions of copernicus, brahe,kepler,galileo,and newton

Answers

Copernicus- developed heliocentric model, discovered the chemical element Copernicum has the symbol Cn and atomic number 112, started the scientific revolution.

Brahe- known for his precise and comprehensive astronomical and planetary observations, which heavily influenced future discoveries; built the maps of Hven that helps in accurate determinations of latitude and longitude.

Kepler - solved the mystery of the planets; believed the Solar System's planets orbited the sun in circular path that determined by an arrangement of the five platonic solids.

Galileo - Father of Modern Science; discovered the first moons ever known to orbit a planet other than Earth; first person to study the sky with a telescope; discovered the rings of Saturn; our moon has mountains; Milky Way is made up of stars; established that everything falls to the ground at the same rate regardless of weight; identified the parabola; proposed theory of relativity; discovered pendulums; tried to measure the speed of light; showed the set of perfect squares.

Newton- generalized the binomial theorem; showed sunlight is made up of all the colors of the rainbow; discovered the law of gravitation; Laws of motion and calculus.

What does Hess’s law state?

Answers

Hess's law states that the energy change in an overall chemical reaction is equal to the sum of the energy changes in the individual reactions comprising it. In other words, the enthalpy change of a chemical reaction (the heat of reaction at constant pressure) does not depend on the pathway between the initial and final states. The law is a variation of the first law of thermodynamics and conservation of energy.

Answer:

C. The enthalpy of a reaction is the sum of the enthalpies of intermediate reactions.

Explanation:

The heat of any reaction ΔH∘f for a specific reaction is equal to the sum of the heats of reaction for any set of reactions which in sum are equivalent to the overall reaction.

True or False: Changes in states of matter indicate a chemical change.

Answers

False, changes in matter indicate a physical change.

Answer:

False

Explanation:

Changes in state of matter indicates a physical change. Always remember these learning tools:

For Physical Changes:

S - Size, Shape, State

For Chemical Changes:

Odor Color Bubbles/Gas Light Temperature Precipitate

Ol' Country Boys/Girls Like Their Pickups

Hope this helps!!!❤️

How many atoms of carbon are present in a molecule of :
Fructose and galactose

Answers

In Fructose, there are 4 carbon atoms. Fructose is a 5 atom molecule, and one of these is oxygen, therefore, the other 4 are carbon.
In Galactose, there are 6 carbon atoms.
Hope this helps :)

Answer:

the answer is starch

Explanation: i chose fructose but got it wrong and showed that starch is correct

Why is it important to know your variables when conducting an investigatory problem ?

Answers

You can harm ur self if you dont know variables . Bcs the values of variables should limit.

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When does phenolphthalein turn pink?a) in the presence of a baseb) in the presence of an acidc) when it is in a neutral solutiond) when it is reacting with a metal