What are 3 signs that a chemical reaction is happening, what tells you that this is definitely a chemical reaction?

Answers

Answer 1

Answer:

Answer:

A chemical reaction is usually accompanied by easily observed physical effects, such as the emission of heat and light, the formation of a precipitate, the evolution of gas, or a color change

Related Questions

Find the pH of the following solution. 1.2 L of a solution containing 5.0x10^-4 grams of hydrobromic acid.
What is a main reason why the scientific model of atoms is considered a theory rather than a law? It has been proven as a fact. It has been changed over time. It predicts but does not explain. It has stayed the same for a long time.
A carbon-12 atom has 6 protons, 6 neutrons, and 6 electrons. How many protons does a carbon-14 atom have?
Write an equation that shows the formation of a selenide ion from a neutral selenium atom
Which statements about the formation of the solar system are true and in a correct order? A. A black hole collapsed to form the sun; small planetary objects formed; small planetary objects collided with each other to form larger objects. B. Most of the dust and gas contracted into a central mass—the Sun; half the mass of the cloud condensed to form Jupiter; asteroids and comets crashed into the sun to form the smaller planets. C. A spinning cloud of dust began to compress to form the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets. D. Gravitational force held the newly formed planets around the sun; small planetary objects formed; hydrogen and helium became concentrated in the outer solar system to form the outer planets.

How to know if two elements will form a covalent bond

Answers

Answer:

If they are both non-metals

Explanation:

covalent = non-metal + non-metal

ionic = metal +non-metal

metallic = metal +metal

Which interaction is responsible for the force of attraction between the particles in a salt crystal? A. proton-proton
B. proton-electron
C. neutron-electron
D. electron-electron

Answers

The answer is proton-electron attraction. All chemical bonds whatever the type will end up in one single idea that protons attracts electrons. The protons in the nuclei of an atom attracts all electrons near, those that came with the atom itself and electrons of atoms nearby. The two atoms get closer and a chemical bond is formed.

Answer:

Explanation:

What mass of sodium carbonate is required to prepare 2.00 l of 0.250 M Ma2CO3 solution

Answers

Molar mass Na₂CO₃ = 106.0 g/mol

M(Na₂CO₃) = molarity x volume x molar mass

M(Na₂CO₃) = 0.250 x 2.00 x 106.0

M (Na₂CO₃) = 53 g

hope this helps!

What is represented by the dots in a Lewis electron-dot diagram ofan atom of an element in Period 2 of the Periodic Table?(1) the number of neutrons in the atom(2) the number of protons in the atom(3) the number of valence electrons in the atom(4) the total number of electrons in the atom

Answers

The number of Valence electrons are shown so that one can clearly see the electron transfer or sharing that may take place between the atoms.

Salt crystals are shaped like cubes. Salt is part of the _____.

Answers

Answer:

The correct answer is: cubic or isometric crystal system

Explanation:

The cubic crystal system, also known as the isometric crystal system, is one of the seven crystal systems, that has a cubic unit cell.

It can be classified into three types: simple cubic system, body-centered cubic system (bcc) and face-centered cubic system (fcc).

The salt, sodium chloride, forms isometric crystals and thus is part of the cubic or isometric crystal system.

salt is isometric as they're blocks or cubes.

A geographical area where plants, animals, the landscape and the climate all interact together is called a(n)environment.
ecosystem.
biome.
food web.

Answers

It's ecosystem :)
noun: eco-systemsa biological community of interacting organisms and their physical environment.

Other Questions

Which hydrocarbons are present in styrene?a) alkene b) alkyne c) none of the above?

How many oxygen atoms are contained in the following chemical formula? 2agno3 a. 2 b. 3 c. 5 d. 6

What volume of a 0.40 M Mg(NO3)2 solution contains 89g of Mg(NO3)2?

A chemist has dissolved a certain substance in water the chemist knows that more of the substance could be dissolved into the water before it stops dissolving there for the current solution is a.) unsaturated b.) saturated c.) supersaturated