Spontaneous reactions __ are always exothermic always take place at a rapid rate always release free energy always result in increased disorder of the system
Why does a higher temperature cause a reaction to go faster? Collisions occur with greater energy only. There are more collisions per second only. There are more collisions per second and the collisions are of greater energy. There are more collisions per second or the collisions are of greater energy.
What is the molar solubility of Ni_(3)PO_(4) in a 1.00L solution of 0.00300M solution of Ni^+ Ni_(3)PO_(4)Ksp=4.5^ast 10^-18 Answer
7. Hemiacetals are? a. produced on the oxidation of a carboxylic acid b. result of the reaction between an aldehyde and a ketone c. are produced when an ether reacts with a ketone
Which of the following functional groups is present in acetic acid? hydroxyl group sulfhydryl group carbonyl group carboxyl group
Which of these drinks contain the most alcohol? A 12 ounce beer A 5 ounce glass of wine They all contain equal amounts of alcohol A 1.5 ounce shot of 80 proof whiskey
Strong bases dissociate only slightly in water. True False
Use the balanced equation, 4Al+3O_(2)arrow 2Al_(2)O_(3) to answer the following question. How many grams of O_(2) are needed to react completely with 14.3 g of Al? Be sure your answer has the correct number of significant figures. square g O_(2)
4.2 Write the symbols for the following elements: a. oxygen b. lithium c. uranium d. titanium e. hydrogen f. chromium g. tin h. gold
Identify the spectator ions for the reaction between calcium nitrate and sodium sulfate The balanced molecular equation is Ca(NO_(3))_(2)(aq)+Na_(2)SO_(4)(aq)arrow CaSO_(4)(s)+2Na NO3 (aq) Ca^2+ and NO_(3)^- Na^+ and NO_(3)^- Na^+ and SO_(4)^2- Ca^2+ and SO_(4)^2-
Explain why the valence electrons are important in determining the chemical properties of an element. They are involved in chemical bonding. They determine the element's color. They determine the atomic mass. They are located in the nucleus.
8. Arrange the following molecules in order of increasing boiling points: $CH_{4},CO_{2},HF,NaCl,Kr,PH_{3}$
4x A chemical reaction for the reaction of Sodium Hydroxide $(NaOH)$ and Hydrochloric Acid (HCl)is shown. The masses of some of the reactants and products are given in grams. $NaOH+HCl\rightarrow NaCl+H_{2}O$ 16g 24912g ? How many grams of water were produced in the reaction? A 189 B 289 C 409 D 529
3. In the lab what was the mass of the steel wool after burning? 1.5149 1.426 g 23479 2.7649 4. Why does steel wool burn, but not an iron rod? The steel wool increased the surface area between reactants, which increased the rate of reaction. The steel wool decreased the surface area between reactants, which decreased the rate of reaction. 5. Why does the steel wool weigh more after the reaction? because oxygen was added during the reaction. it didn't weigh more because energy was created
1. What factors affect reaction rates? Mark all that apply the surface area of reactants the temperature of systems the concentration of reactants presence of a catalyst color of the reactants In the lab , what was the mass of the steel wool before burning? 1.426 g 2.571 g 5.328 a
Marie is learning about the differences between physical and chemical changes in her physical science cuss Which of the following of the house of everyone is occurred? Having a sliced apple turn brown when exposed to air due to oxidation is a physical change Because a new substance has not formed you stall have an appe Heating a piece of metal in a furnace until it glows brightly is a chemical change because the color and appearance of the metal has changed Adding sugar crystals to water to form a clear, colorless liquid is a physical change because the sugar crystats can be separated from the lagued and returned b It's engineer lives. Heating a block of ice to form a liquid is a chemical change because the state of matter has changed from a solid to a bqux1.
Balance cherical reaction equalions Determine mole ratios from a balanced chemical maction equation. Vatue: 4 Seled the comed coeficient to balance the chemical reaction below. $Mg(s)+O2(g)-2MgO(s)$
3. Whattype of resction occure during this experiment? double replacement oxidation reduction (redox) reversible none of the above
Biochemistry A Final Exam Answer the following questions using the drop down menus below: What force makes protons not want to be together? $\square $ Is this force attractive or repulsive? $\square $ Nuclear Force
Aqua Sci Fall MidTerm 2023 A Thinking about how chlorine ne is added to tap water to disinfect the water, what does the quote "The dose makes the polson" mean"? some substances can be toxic/harmful if used in large amounts but may not be toxic/harmful in small amounts 6 $\square $ the poison is about the substance, not the amount $\square $ no one should drink chlorine no matter how small the amount $\square $ waler is water, doesn't matter what dose of substances are in the water POSSIBLE POIN
