Which statement is supported by the law of conservation of mass?

• The mass of the products of a chemical reaction are always less than the mass of the reactants.

• products of a chemical reaction are always greater than the mass of the reactants.

• The mass of the products of a chemical reaction have no relationship to the mass of the reactants.

• The mass of the products of a chemical reaction are always equal to the mass of the reactants.

Tags

NGSS.HS-PS1-7

A chemical reaction is shown. SnO₂+H₂>>>>>>Sn+H₂O. What is true about this chemical reaction?

• It is balanced because the mass of the reactants is equal to the mass of the products.

• It is unbalanced because the mass of the reactants is greater than the mass of the products

• It is unbalanced because the mass of the reactants is less than the mass of the products

• It is balanced because the numer of reactants is equal to the number of products

Tags

NGSS.HS-PS1-7

Sophia performs an experiment in which she adds 10 grams of zinc mental to 25 grams of bromine. She claims that mass will be conserved during the reaction. Which is the following BEST supports her claim?

• The mass of the final product will be equal to the mass of the zinc metal, 10 grams.

• The mass of the final product will be equal to the difference between the two masses, 15 grams

• The mass of the final product will be equal to the mass of the bromine, 25 grams.

• The mass of the final product will be equal to the total mass of both reactants, 35 grams

Tags

NGSS.HS-PS1-7

Group 1 mixed baking soda and vinegar in a flasked closed by a balloon. Group 2 mixed the same but in an open flask without a balloon. How would the final mass of Group 2 compare to Group 1?

• The mass of the final product will be equal to the mass of the zinc metal, 10 grams.

• The mass of the final product will be equal to the difference between the two masses, 15 grams

• The mass of the final product will be equal to the mass of the bromine, 25 grams.

• The mass of the final product will be equal to the total mass of both reactants, 35 grams

Tags

NGSS.HS-PS1-7

What must all chemical reactions have to adhere to the law of conservation of matter?

• a balanced number of each atom type in the products and in the reactants

• a larger number of each atom type in the products than in the reactants

• more energy in the products than in the reactants

• less energy in the products than in the reactants

Tags

NGSS.HS-PS1-7

The equation shows the reaction bewtween ammonia (NH₃) and oxygen (O₂). NH₃+O₂>>>_NO+H₂O From left to right, which set of coefficients balances the equation to follow the law of condervation of mass?

• 4,5,4,6

• 5,4,5,4

• 5,4,4,5

• 4,6,4,5

Tags

NGSS.HS-PS1-7

Look at the following equation. NaCl+CaF₂>>>NaF+_CaCl₂ In order to follow the law of conservation of mass, this equation must have which set of coefficients, in order from left to right?

• 2,1,3,1

• 2,2,2,2

• 2,1,2,1

• 1,3,1,3

Tags

NGSS.HS-PS1-7

Which chemical reaction supports the law of conservation of matter?

• K+MgBr>>>KBr+Mg

• 2K+2MgBr>>>KBr+2Mg

• K+2MgBr>>>KBr+2Mg

• 2K+MgBr>>2KBr+Mg

Tags

NGSS.HS-PS1-7

Which of the following BEST describes what occurs in a fusion reaction?

• Two low mass nuclei are joined to form one nucleus and give off energy

• A single nucleus divides into two or more nuclei and gives off energy.

• Electrons are shared between the nuclei.

• A chemical reaction occurs between the nuclei.

Tags

NGSS.HS-PS1-8

Where does the energy released in a nuclear decay reaction come from?

• electrons

• chemical bonds

• protons

• the binding energy of the nucleus

Tags

NGSS.HS-PS1-8