A polar covalent bond is formed when electrons are:

Matter is anything that has:

Qasim is studying the chemical reactions in the human body. He learns about enzymes. Which branch of chemistry studies enzymes?

Which of the following is an isotope of hydrogen?

Science, technology and engineering together help in:

Fatima is studying the Heisenberg uncertainty principle. She learns that it states that we cannot know both the position and momentum of an electron with complete certainty. This principle applies to which model of the atom?

Engineering uses chemistry to:

Rusting of iron is an example of:

Which element is a non-metal?

George is learning about double and triple covalent bonds. He knows that multiple bonds involve sharing more than one pair of electrons. Which molecule contains a triple covalent bond?

Which is NOT a state of matter?

Tina is learning about the octet and duplet rules. She knows that hydrogen follows the duplet rule to achieve stability. How many electrons does hydrogen need to achieve a duplet?

Quinn is studying molecular and structural formulas. He knows that the molecular formula shows the actual number of atoms, while the structural formula shows how atoms are arranged. Which formula shows the arrangement of atoms?

Tina is calculating the mass of 0.25 moles of NaCl. The molar mass of NaCl is 58.5 g/mol. What is the mass?

Which cell is responsible for corrosion?

What is meant by energy in chemistry?

Xia is studying the properties of alkali metals. She notes that they are soft and can be cut with a knife. As we move down Group 1, the softness of alkali metals generally:

Which of the following is a true solution?

Electrochemistry mainly deals with:

The number of atoms in one mole of aluminum is:

Oxidation is the process of:

Waseem is studying the boiling points of metals and non-metals. He knows that metals generally have high boiling points. Which of the following is a metal with a very low boiling point?

George is a chemical engineer. He designs processes to convert raw materials into useful products. Which branch of chemistry is fundamental to his work?

Sam is studying a gas that is found in neon signs. The gas glows when electricity passes through it. This state of matter is called:

If empirical formula is CH2 and molecular mass is 28, molecular formula is:

Uma is calculating the gram atomic mass of sodium. She knows that the atomic mass of Na is 23 amu. What is the gram atomic mass of sodium?

Waseem is studying the properties of matter. He observes that a solid has a fixed shape and volume. What is the arrangement of particles in a solid?

Homogeneous mixture has:

Waseem is studying the empirical formula of a compound. He analyzes a compound and finds its mass composition: 32% sulfur and 48% oxygen. What is the empirical formula? (S=32, O=16)

An atom with mass number 23 and atomic number 11 has how many neutrons?