A model of an atom shows eight electrons in rings that represent different energy levels. How many electrons are in each energy level? A. two in the first energy level, six in the second energy leve
B. eight in the first energy level, zero in the second energy level
C. zero in the first energy level, eight in the second energy level
D. four in the first energy level, four in the second energy level

Which statement about an atom is correct?(1 point)
A. The neutron has no charge and is found outside of the nucleus.
B. The electron has a negative charge and is found outside of the nucleus.
C. The proton has no charge and is found in the nucleus.
D. The neutron has a negative charge and is found in the nucleus A student wants to draw a model of an atom.

Which statement describes how to find the number of neutrons to include in the model?(1 point)
A. Subtract the atomic number from the mass number.
B. Add the number of electrons to the number of protons.
C. Subtract the number of electrons from the number of protons.
D. Add the atomic number and the mass number.

What is the atomic number of an atom?(1 point)
A. the number of particles outside the nucleus
B. the number of particles in the nucleus
C. the number of neutrons
D. the number of protons
HEP ASA

Chen drew a diagram to compare the ways in which different organisms obtain nitrogen. which label belongs to the area marked z?

What is the solubility-product constant of barium sulfate, baso4, if a saturated solution is 1.03 ´ 10-5 m?

Activity two: just lemons, inc. production here's a one-batch sample of just lemons lemonade production. determine the percent yield and amount of leftover ingredients for lemonade production and place your answers in the data chart. hint: complete stoichiometry calculations for each ingredient to determine the theoretical yield. complete a limiting reactant-to-excess reactant calculation for both excess ingredients. water sugar lemon juice lemonade percent yield leftover ingredients 946.36 g 196.86 g 193.37 g 2050.25 g 89% just lemons lemonade recipe equation: 2 water + sugar + lemon juice = 4 lemonade mole conversion factors: 1 mole of water = 1 cup = 236.59 g 1 mole of sugar = 1 cup = 225 g 1 mole of lemon juice = 1 cup = 257.83 g 1 mole of lemonade = 1 cup = 719.42 g show your calculations below. analysis questions 1. based on taste observations only, which ingredients were in excess in the lemonade samples in activity one? in activity one the excess substances for each sample were the water and sugar. 2. based on the data in activity two, which excess ingredients are affecting the taste of the lemonade in the sample batch? 3. what can just lemons, inc. do during production to reduce the amount of excess ingredients and improve the taste of their lemonade? 4. try to reduce the amount of leftover ingredients by changing the amount of one, two, or all three starting ingredients. show your stoichiometric calculations below. 5. during factory inspection, just lemons, inc. discovered that a water valve to the lemonade mixing station was not functioning. once they repair it, more water will enter the mixing station. from what you know about the limiting and excess ingredients for current lemonade production, what advice would you give engineers about the upcoming increase in water?