13) Which molecule of an element contains a multiple covalent bond? A) Br_(2) B) F_(2) C) H_(2) D) O_(2)

Which element has the smallest atomic radius? scandium calcium potassium titanium

8. Which solution is the most concentrated? a kg=200;mL=100 b g=20;mL=100 C. kg=20;mL=1 d g=2000;mL=10

a reaction which involves the transfer of electrons sublimation redox condensation double replacement

12) Most chemical explosions are __ reactions. A) nuclear fission B) neutralization C) condensation D) oxidation-reduction 13) The most abundant element (by mass) in the human body is A) carbon. B) nitrogen. C) water. D) oxygen. 14) Magnesium burns brightly in the presence of oxygen. When magnesium reacts with oxygen, the compound formed is A) MgO_(3) B) Mg_(3)O. C) Mg_(4)O_(4) D) MgO 15) Approximately what percentage of the earth's crust is composed of oxygen? A) approx 5% B) approx 40% C) approx 75% D) approx 50% 16) In the reaction N_(2)+3H_(2)arrow 2NH_(3) nitrogen is A) a product. B) a reducing agent. C) a catalyst. D) an oxidizing agent. 17) Antioxidants are A) oxidizing agents found in foods. B) fat-soluble. C) water soluble. D) reducing agents found in foods.

Given 267 g of H_(2)CO_(3) determine the number of moles of H_(2)CO_(3) 1 mol H_(2)CO_(3)=62.03gH_(2)CO_(3) () mol H_(2)CO_(3)=267gH_(2)CO_(3) Round your answer to two decimal places.

Adding hydroxyl oxide (OH^-) to a solution would make the solution's pH more __ alkalotic acidic

What is the net ionic equation for the following chemical reaction? SrBr_(2(aq))+K_(2)SO_(4(aq))arrow SrSO_(4(s))+2KBr_((aq)) 2Br_((aq))^-+2Kr_((aq))^+arrow 2KBr_((aq)) Sr_((aq))^2++SO_(4(aq))^2-arrow SrSO_(4(s)) 2Kr_((aq))^++SO_(4(aq))^2-arrow SrSO_(4(s)) Sr_((aq))^2++2Br_((aq))^-arrow SrBr_(2(s))

Determine in each of the following situations if the reaction moves left or right. H_(2(g))+I_(2(g))rightarrow 2HI_((g)) Delta H=-40.0kJ/mole HI is removed. square

Anions occur when The outer shell is almost full. The outer shell is full. There is no outer shell. The inner shell is full.

Hot Questions

Before you go, which type of molecule would you choose to be the anode in a lithium battery? a) The metal with the most negative potential b) It does not matter since lithium's potential is so negative c) The metal with the most positive potential d) Another lithium compound

Part I: Unit Conversions.Show all work (known and unknown, and dimensional analysis - including units! Write your answers in the boxes provided. Unit Test: Dimensional Analysis and Mole Convers 1. Find the number of minutes in 25 years, assuming that $1year=365days$ K:25 years 2. The driving distance from Spokane to Seattle is 479,000 meters. Convert this distance to miles given $1m=100cm,1in=2.54cm,12in=1ft,$ and $1mi=5280ft$ $\square $ Part II: Mole Conversions . Show all work (known and unknown, and dimensional analysis - including units! Write your answers in the boxes provided. 3. A sample contains $9.2\times 10^{22}$ atoms of beryllium (Be)How many moles is this? $\square $ 4. The formula for Aluminum Carbonate is $Al_{2}(CO_{3})_{3}$ What is the molar mass of aluminum carbonate? $\square $

The following reaction is an example of a substitution reaction. $2Na+Cl_{2}\rightarrow 2NaCl$ TRUE FALSE

Heterogeneous mixtures are observed to be uniform throughout. True False

What are some examples of foods that need an emulsifier mayonnaise chocolate ice-cream oil water various salad dressings.

27. The contents of a drum have not been identified. You notice crystalline material on top of the drum, you should treat the contents as: A. shock-sensitive waste. B. nearly empty. C. containing chlorinated solvent. D. containing caustic materials.

A weak acid is a dilute acid that is not very powerful. True False

What is a crucial aspect of chemical optimization? Adjusting team member speed Pre-treating the vehicle Using water reclamation tanks Ordering new equipment

Why is chemistry sometimes referred to as the "central science?" Because we need to know it to survive as a species. Because it is interconnected with many other STEM disciplines. Because it incorporates principles from math and physics. Because there are many subdisciplines of science that rely on chemistry.

Malia was able to make a paperclip float on the surface of water. What will most likely happen to the paperclip if a drop o dishwashing detergent is added near it? Soap is a surfactant that increases the intermolecular forces of water allowing the paperclip to continue to float. Soap makes the water less viscous making the paperclip sink. Soap is a surfactant that disrupts the intermolecular forces of water making the paperclip sink. Soap makes the water more viscous allowing the paperclip to continue to float.