Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.

The mass of the reactants equals the mass of the products.

The mass of the reactants is less than the mass of the products.

The mass of the products is always greater than the mass of the reactants.

The mass of the reactants is greater than the mass of the products; some mass is lost when atoms recombine.

What evidence is present in the picture to indicate that a chemical change has occurred?

The presence of rust indicates a chemical change has occurred.

The change in state indicates a chemical change has occurred.

The change in shape indicates a chemical change has occurred.

The evidence of burning indicates a chemical change has occurred.

Barnard and Juan conducted several tests to determine the properties of a piece silver metal. They noted that is was white, and conducted both electricity and heat. They computed the density to be 10.49 g/cm 3 . when the boys placed the piece of silver in a beaker of water, nothing happened, but when the silver was dropped into nitric acid, a gas was released and the silver disappeared. Which sentence describes a chemical reaction taking place?

When the silver was dropped into nitric acid, a gas was released.

Silver is a conductor of both electricity and heat.

The density was calculated to be 10.49 g/cm 3

When the boys placed the piece of silver in a beaker of water, nothing happened,

While studying chemical and physical changes, students added salt to a glass of water. They stirred the salt until it dissolved and could no longer be seen. "That's a chemical change," Sarah stated. Do you agree? Explain.

No, it is a physical change. It is salt and water and you can get the salt back by boiling off the water.

Yes, it is a chemical change because something new is formed.

Yes, it is a chemical change because there was a change in the appearance of one of the components, the salt.

No, it is a physical change. A chemical change cannot occur when you mix two compounds together like salt, NaCl, and water, H 2 O, without adding heat.

To dazzle his students, Mr. Turner collected volumes of ammonia gas and carbon dioxide gas. As the two colorless gases were combined in a closed two-liter bottle with a small amount of ammonium hydroxide, the chemistry students watched in amazement at the growth of white crystals inside the bottle. What happened inside the bottle as the gases were mixed?

Ammonium carbonate (white crystals) formed due to the reaction between ammonia gas and carbon dioxide gas.

The crystals dissolved immediately upon formation

The gases turned into a rainbow of colors

The bottle exploded due to the pressure from the gases

Identify which property changes as temperature increases to increase the reaction rate.

Increasing the temperature increases the energy of the molecules.

Increasing the temperature decreases the molecular motion.

Increasing the temperature reduces the collision frequency.

Increasing the temperature divides the solubility of the solute.

Janice notices that the reaction rate increases if she heats the solution. Explain why.

Increasing the temperature increases the molecular motion.

Increasing the temperature decreases the energy.

Increasing the temperature reduces the collision frequency.

Increasing the temperature divides the solubility of the solute.

Tim adds salt as he starts to heat a pot of water to cook pasta. When the water is boiling, he notices the salt has dissolved. Explain why.

Increasing the temperature increases the solubility of salt.

Increasing the temperature divides the solubility of salt.

Increasing the temperature reduces the solubility of salt.

Increasing the temperature decreases the solubility of salt.

Food deteriorates more slowly in a refrigerator because...

there are fewer collisions due to a lower temperature.

the energy of activation is higher.

Physical Science (pt. 2): properties of matter, mixtures..

Authored by Edny Martinez

Science

8th Grade

SC covered

Physical Science (pt. 2): properties of matter, mixtures..

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MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The model of the atom where the central core contains protons and neutrons surrounded by a cloud of electrons is best described as...

The Bohr model of the atom.

The modern model of the atom.

The plum pudding model of the atom.

The solar system model of the atom.

Tags

SC.8.P.8.7

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Modern atomic theory states that the atom is a diffuse cloud surrounding a small, dense nucleus. Identify which particle is in the nucleus.

proton

photon

free radical

electron

Tags

SC.8.P.8.7

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Modern atomic theory states that the atom is a diffuse cloud of ________ surrounding a small, dense nucleus.

protons

neutrons

photons

electrons

Tags

SC.8.P.8.7

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which subatomic particle is involved in a chemical reaction?

Tags

SC.8.P.8.7

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which part of the diagram represents the proton?

Tags

SC.8.P.8.7

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

Which of these is NOT characteristic of acids?

Corrosive to metals

Sour smell

Bitter taste

Red litmus paper turns blue

MULTIPLE CHOICE QUESTION

30 sec • 1 pt

The pH scale runs from 0 to 14, and is an indication of how acidic or basic a solution is. A pH close to zero indicates a(n) _ solution, and a pH near 14 indicates a(n) _ solution.

basic; acidic

neutral; basic

acidic; neutral

acidic, basic

Tags

SC.8.P.8.8

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Physical Science (pt. 2): properties of matter, mixtures..

The model of the atom where the central core contains protons and neutrons surrounded by a cloud of electrons is best described as...

Modern atomic theory states that the atom is a diffuse cloud surrounding a small, dense nucleus. Identify which particle is in the nucleus.

Modern atomic theory states that the atom is a diffuse cloud of ________ surrounding a small, dense nucleus.

Which subatomic particle is involved in a chemical reaction?

Which part of the diagram represents the proton?

Which of these is NOT characteristic of acids?

The pH scale runs from 0 to 14, and is an indication of how acidic or basic a solution is. A pH close to zero indicates a(n) _ solution, and a pH near 14 indicates a(n) _ solution.

Suzy uses an Italian salad dressing on her lunch. This ____________ mixture is a suspension of oil and vinegar.

According to the Law of Conservation of Mass, which box on the right correctly demonstrates the product of this reaction?

Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.

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Physical Science (pt. 2): properties of matter, mixtures..

The model of the atom where the central core contains protons and neutrons surrounded by a cloud of electrons is best described as...

Modern atomic theory states that the atom is a diffuse cloud surrounding a small, dense nucleus. Identify which particle is in the nucleus.

Modern atomic theory states that the atom is a diffuse cloud of ________ surrounding a small, dense nucleus.

Which subatomic particle is involved in a chemical reaction?

Which part of the diagram represents the proton?

Which of these is NOT characteristic of acids?

The pH scale runs from 0 to 14, and is an indication of how acidic or basic a solution is. A pH close to zero indicates a(n) _______ solution, and a pH near 14 indicates a(n) _______ solution.

Suzy uses an Italian salad dressing on her lunch. This ____________ mixture is a suspension of oil and vinegar.

According to the Law of Conservation of Mass, which box on the right correctly demonstrates the product of this reaction?

Based on the Law of Conservation of Matter, describe the relationship between the mass of the reactants and the mass of the products.

Access all questions and much more by creating a free account

Similar Resources on Wayground

Popular Resources on Wayground

Discover more resources for Science

The pH scale runs from 0 to 14, and is an indication of how acidic or basic a solution is. A pH close to zero indicates a(n) _ solution, and a pH near 14 indicates a(n) _ solution.