When was the last time that humans have left Earths orbit?

A 1969

B 1972

C 1992

D 2003

The earliest and simplest definition of acids and bases was suggested by

Physical properties of tooth paste

Which of the following is most likely to produce data that are not precise

Which of the following would have the greatest force of gravitational attraction.

Nitroglycerin (c3h5n3o9) is a powerful explosive. its decomposition may be represented by 4c3h5n3o9 → 6n2 12co2 10h2o o2 this reaction generates a large amount of heat and gaseous products.

What is the relationship between the location of volcanoes and earthquakes? A. Volcanoes form in areas of high earthquake activity. B. Volcanoes form on the opposite coasts from where earthquakes happen. C.

If two atoms have the same atomic numbers but different mass numbers, then they can be considered atoms of the same element. True or False

All of the following are true of bases except Arrhenius bases are any substances that decrease the concentration of hydroxide ions. Brønsted-Lowry bases are any substances that accept a hydrogen ion.

What does CaCO3 represent?

How much heat is required to warm 1.70 l of water from 30.0 ∘c to 100.0 ∘c? (assume a density of 1.0g/ml for the water.) ?