Convert the mass of na2co3 to moles, given its molar mass (mm) of 105.989 g/mol

A persn uses 750 kcal on a long hike. Calculate the energy used in both units: a. joules b. kilojoules

Which of the statements below is not a characteristic of economically developed nations? 1. access to health care 2. high standard of living 3. industrialization 4. reduced use of resources

What is a homogeneous mixture called when microscopically insoluble particles are suspended throughout another substance? Colloid Compound Emulsion Solution

What is an example of an ionic solute besides salt?

What is the major current use of solar thermal energy? A. to grow crops for biomass B. to provide heat and hot water for houses C. to collect heat from Earth's igneous rocks D. to power wind farms

A child pulls a sled up a snow-covered hill. The child does 405 J of work on the sled. If the child walks 15 m up the hill, how large of a force must the child exert?

A piece of glass with a mass of 32.50 g specific heat of 0.840 J/g*°C and an initial temperature of 115 °C was dropped into a calorimeter containing 57 g of water (specific heat 4.184 J/g*°C).

Which of the following is the most likely description of the product or products of a double-displacement reaction? A) one new compound B) two new compounds C) oxygen and energy D) one new compound and an element

A balloon is filled with 12L of air at a pressure of 2 atm. What is the volume of ballon if the pressure is changed to 3 atm?

What ionic bond occurs between what particles? A. Two Negative Ions B. A positive and negative ion C. Two positive ions D. Two neutral atoms