Which of the changes are physical changes

You carefully weigh out 11.00 g of caco3 powder and add it to 44.55 g of hcl solution. you notice bubbles as a reaction takes place. you then weigh the resulting solution and find that it has a mass of 51.04 g.

Which of the following is a synthesis reaction? 2Na + 2H 2O 2NaOH + H 2 2S + 3O 2 2SO 3 2H 2O 2 2H 2O + O 2 CaCl 2 + F 2 CaF 2 + Cl 2

How does a catalyst increase the rate of a reaction? Group of answer choices it allows reacting molecules to more easily form the transition state it causes a localized increase in the concentration of reactants it increases the temperature of the

In a particular breed of cattle a black coat is dominant over red coat if a cow with a red coat is crossed with a black bull that is heterozygous for coat color what percentage of offspring would you expect to be black

When a solid is converted directly to a gas, the change of state is called?

a 1kg rock is at a height of 100 meters. What is the rocks gravitational potential energy at 100 meters high

Why doesn't the stomach acid just digest right through the wall of the stomach? Select one: a. Neutralizers are imbedded in the stomach lining. b. The lining of the stomach is protected by mucus. c.

If a substance cannot be seperated physically or chemically, it is?

Match each type of sedimentary rock with its composition. 1. mineral crystals clastic sedimentary rock 2. remains of dead creatures organic sedimentary rock 3. weathered rock particles chemical sedimentary rock

A scientist observes the boundary between two tectonic plates for a decade and finds that no new volcanoes have formed over the course of her investigation. Does this result support the theory of plate tectonics? Why or why not?