Chemistry Questions
Explore questions in the Chemistry category that you can ask Spark.E!
What organisms are the most likely pathogens to grow in food that is solute-loaded or has low water activity?
Cholera can be transmitted by food or water (true or false)
Flour and sugar are classified as ________ foods.
At approximately what temperature are most household freezers kept? (celcius)
The rate of contaminant microbial growth during the exponential phase in food depends on
When solute is added to food products, the water activity (aw)
Pickling is a type of food preservation utilizing
Clostridium botulinum is a gram-________ rod that produces an ________.
Which organisms are NOT involved in food fermentations?
Coliforms in a water sample indicate ________ contamination.
BOTH physical and chemical methods are used to treat and purify water. (true or false)
Which of the following is NOT characteristic of a coliform? gram-negativefacultatively aerobicrod shapedresistant to chlorination
What is the conjugate base of H2SO4a. HSO4-b. SO42-c. SO4d.HSO4
Which is the formula of an amphoteric substance?a. So32-b. HCO3-c. NH4+d. HCI
In the reaction:H3AsO4(aq)+3Na OH(aq)-->NaAsO4(aq)+3H2O(l) ,how many H= ions dose the bronsted acid losea.2b.1c.4d.3
Which of the following is/are true about HCO-3?a. HCO-3+H+---->H2CO(aq)b. HCO-3(aq)-->H=(aq)+ CO3/2-(aq)c. HCO-3 species are said be amphoteric since they posses both acids and basic properties d.All of the above
Finish the acid bases reaction below by writing the formulas of the two products.H2CO3(aq)+F-(aq)<=>a. HCO3-+HFb.HCO3+HF-c.CO3+HF-d.CO3/2-+H2F+
A substance which can act as both an acid and in different reactions is said to be__________.a. diprotic b. Bipolar c. amphotericd. catalytic
The ammonium ion serves as an acid in chemical reactions because it donates a BLANK.
2H2O<=>H3O+ +OH-Chose the conjugate acid-base pair from the above equation2 answersa. A-IH3O+b. H2OIH3O+c. H2OIHAd. OH-IH2O