How can the rate of a reaction be increased? a. having more surface area b. Lowering the temperature c. diluting a solution d. decreasing the amount of reactants

When scientific work can be duplicated it is proves a hypothesis correct is reliable Does not require evaluation

If there is 8g substance before a physical change, how much will be afterwards? 0g 4g 8g 16g

Which statement describe velocity and acceleration

Finish this sentence; ... Is the amount of matter that makes up something

Is a fan a complex machine

Which of these is not a source of the shock waves that lead to protostars?

Which kind of information is known about a person if that person's DNA is in a database? A. how old the person is B. where the person was probably born C. some diseases the person might have D. whether the person is likely to commit a crime

A science teacher ran a marathon. After the race she showed her students the silver blanket she was given to keep her warm. A group of students investigated how the colour of the blanket affected how much infrared radiation is absorbed

Students asked to measure the temperature of a reaction beaker recorded the following temperatures. 103.7°C, 108.4°C, 105.8°C, 104.6°C The actual temperature is 105.1°C. Which measurement is the most precise

Two atoms that are isotopes of one another must have a different number of what? electrons neutrons protons all particles