Why do scientists use microscopes to observe cells? A. A microscope holds a moving cell very still .
B. A microscope prevents a cell from dividing too quickly.
C. A microscope makes tiny cells appear much larger.
D. A microscope makes a large cell appear smaller.​

When 13.3 g koh is dissolved in 102.7 g of water in a coffee-cup calorimeter, the temperature rises from 21.4 °c to 31.53 °c. what is the enthalpy change per gram of koh (j/g) dissolved in the water? * take the density of water as 1.00 g/ml. * assume that the solution has a specific heat capacity of 4.18 j/g*k. enter to 1 decimal place. do not forget the appropriate sign /(+). canvas may auto-delete the (+) sign

Which of the following is described by the equation h2o(s)+ heat=h2o(i) a freezing melting condensing evaporating

1) a light bulb takes in 30 of energy per second. it transfers 3j as use energy. calculate the efficiency. second. it transfers 3j as useful light energy and 27j as heat energy. calculate the efficiency