In order for a reaction to occur, reactant molecules must collide with each other. true or false

Marine organisms that are well adapted to drastic changes in salinity would most likely be found in which environment? a. Hydrothermal vent b. Estuary c. Open ocean d. Deep ocean

How are mass and weight different? is it c Weight is the amount of matter and mass is the effect of gravity on weight. Weight is the space an object takes up and mass is the effect of gravity on mass.

Extend your thinking: Why do you think the temperature does not change much during a phase change? If possible, discuss your answer with your classmates and teacher.

Cladistics is a way to separate animals into new species. t or f

A sample of 2.0 moles of a metal reacts completely with excess oxygen to form 62.0 g of M2O. What element is represented by the symbol M?

What is the mass number of an ion with 107 electrons, 157 neutrons, and a 1 charge?

Which of the following is true about compounds

According to the chart, which substance has the lowest OH' concentration? A) urine lemon juice tomato juice D) black coffee

23 Which term identifies the half-reaction that occurs at the anode of an operating electrochemical cell? (1) oxidation (3) neutralization (2) reduction (4) transmutation

Which of the following is true? A) Gas atoms subjected to electricity emit bright lines of light. B) Gas atoms absorb white and emit a continuous spectrum of light. C) Gas atoms under high pressure emit dark lines against a continuous spectrum.