Match the term with the answer,

1. Atom

2. Phase

3. Element

4. particle

A. The basic unit of an element

B. A substance that cannot be broken down into a simpler substance

C. A tiny piece of matter

D. A unique form of matter in which it can exist

Transition elements A. Group 1 elements B. elements that make up the f block C. elements of the s and p blocks D. Group 17 elements E. entire set of d-block elements

Which one is a true statement about endothermic reactions? Question 2 options: Energy is absorbed making it feel colder. The reaction container always feels hot. The reactants have less heat energy than the products.

Why the output force exerted by a rake must be less than the input force

Which of the following carbon-based molecules stores information

Nonmetals rarely lose electrons in chemical reactions because?

How is the Bohr atomic model different from the plum-pudding model? A. In Bohr's model, the atom's mass is found at its center instead of distributed throughout. B. In Bohr's model, the atom's mass is mostly made up of electrons instead of protons.

What does the cell theory state? A. that cells come from other cells B. that cells come only from animals C. that cells cannot be created or destroyed

For which one of the following molecules is the indicated type of hybridization not appropriate for M the central atom? a. BeCl2 sp2 b. SiH4 sp3 c. BF3 sp2 d. C2H2 sp e. H2O sp3

P4O10 (s) = - 3110 kJ/mol H2O (l) = - 286 kJ/mol H3PO4 (s) = - 1279 kJ/mol Calculate the change in enthalpy for the following process: P4O10 (s) + 6H2O (l) → 4H3PO4 (s)

Aluminum bromide reacts with chlorine gas to produce aluminum chloride and liquid bromide, according to the chemical equation below: 2A1Br3 + 3Cl2 + 2AlCl3 + 3Br2 How many moles of Aluminum chloride are made if 779 g of chlorine gas are consumed?