Samado

Which statement best describes the law of conservation of mass? A. Matter cannot be created or destroyed in a chemical reaction B. Reactants in a chemical reaction rearrange to form a new substance or substances C. Reactants and products cannot escape fro...

Hydrogen (H2) and oxygen (O2) combine to make water (H2O) in the following equation. 6H2 + 3O2 -> ?H2O How many water molecules would be produced? A. Six B. Four C. Three D. Five

Alpha Particles Emission Quick Check A process in which a large nucleus splits into two or more parts is called _. A. Radioactive decay B. Nuclear fusion C. Nuclear fission D. Beta decay

Why are gases like nitrogen and oxygen not greenhouse gases, despite being gases that exist in the atmosphere? A. They occur naturally, so they cannot contribute to global warming B. They exist in such large quantities that Earth is already used to them a...

Use the periodic table and example bond table to answer the question. Example Bond Energies of Ionic Compounds: Li-F = 1036 kJ/mol Li-Br = 807 kJ/mol Na-F = 923 kJ/mol Na-Br = 747 kJ/mol Given the general trend with bond energies, which compounds would ha...

Which statement is the best description of the energy found in molecules of water? A. Colder molecules have more kinetic energy. B. Hotter molecules have more kinetic energy C. A molecule’s temperature is not connected to its energy D. Colder molecules ha...

Endothermic reactions absorb a lot of energy. Exothermic reactions give off a lot of energy. Which type of reaction has a higher activation energy? Which one takes more energy to break up the bonds of the reactants?

Use the reaction to answer the question Fe₂O₃ + 3H₂SO₄ How many atoms of oxygen will be found in the product(s) of the reaction? (1 point) A. 3 B. 12 C. 4 D. 15

Use the table of molar masses to answer the question Element: | Molar mass (g/mol): Silicon 28.09 Oxygen 16.00 How many molecules of silicon dioxide (SiO₂) are there in a 15-gram sample? A. 6.022 x 10^23 B. 1.503 x 10^23 C. 2.049 x 10^23 D. 1.251 x 10^23

1. Matter cannot be created or destroyed in a chemical reaction 2. Numbers of reactant and product atoms 3. 20 g 4. A sealed jar of salad dressing 5. Two Thought I’d give back a lil since I couldn’t find these answers online <3

1. Six 2. 12 oxygen atoms 3. Reactant bonds break and atoms rearrange to form new product combinations 4. Two 5. No, it does not because the number and mass of atoms are conserved even though the number of molecules is not

1. The number of freely moving neutrons increases over time 2. A neutron should be expressed as 10n, not 01n 3. The table tennis balls represent neutrons that are released when the nucleus splits and cause other nuclei to split 4. The total mass number of...

1. Nuclear fission 2. two protons and two neutrons 3. The model shows alpha decay, which is a type of nuclear fission 4. No, it is not because the mass number does not change 5. Gamma emission is a type of radioactive decay, but is not a fission reaction

1. They are tightly bound, so they cannot vibrate and release radiation. 2. The molecule vibrates and releases infrared energy 3. No, this is incorrect because water vapor is a greenhouse gas and will increase the greenhouse effect. 4. The burning of foss...

Would it be #2? Wouldn’t heating the blue solution cause it to go towards pink and make it purple?

Wait it would be 1, the purple would turn pink when cooled down

Thank you! I hope I get the other ones correct too