Exam (elaborations)
JLABS EXAM QUESTIONS WITH 100% VERIFIED ANSWERS
- Course
- Institution
JLABS EXAM QUESTIONS WITH 100% VERIFIED ANSWERS...
[Show more]
Content preview
JLABS EXAM QUESTIONS WITH 100% VERIFIED ANSWERSWhen 1 g of sodium chloride (NaCl) is placed in 100 g of water, a solution results.
Once the solution is prepared, water is now considered what part of the solution? -
ANSWER Solvent
How many electrons does the iron ion have when it forms the ionic compound
FeCl3? - ANSWER 23
What is the volume of the water in this graduated cylinder? - ANSWER 4.39 mL
The product in a balanced reaction is 4Al2O3. Which of the following shows the
number of aluminium and oxygen atoms in 4Al2O3? - ANSWER 8 atoms of
aluminum and 12 atoms of oxygen
For an equal mass of each substance, which one will require the least amount of
heat to raise its temperature from 20°C to 30°C? - ANSWER Glass
For an equal mass of each substance, which one will require the least amount of
heat to raise its temperature from 20°C to 30°C? - ANSWER 67.2 L
Which substance will release the greatest amount of heat when 1.00 mol is frozen?
- ANSWER Benzene
A student hypothesizes that bromine (Br) has different chemical properties from
krypton (Kr). The periodic table supports this hypothesis by indicating that - -
ANSWER bromine and krypton have different numbers of valence electrons
A mixture of gases with a pressure of 800 mmHg contains 10% oxygen and 90%
nitrogen by volume. What is the partial pressure of the oxygen gas in the mixture? -
ANSWER 80 mmHg
Zn(s) + 2HCl(aq) → ZnCl2 + H2(g)
What type of reaction is shown? - ANSWER Single Replacement
Hydrogen chloride is a covalent compound. Which is the correct Lewis dot
structure for HCl? - ANSWER ..
H:Cl:
, .. All dots surrounding Cl none around H
Which is the best use for a fume hood? - ANSWER Removing toxic vapors
Which of the following equations is balanced? - ANSWER 2Na + Cl2 → 2NaCl
The picture shows a small section of elements from the periodic table. Which
element has one more proton than element X? - ANSWER 4
An example of a chemical property is - ANSWER tendency to undergo oxidation
What is the name for the compound CaSO4? - ANSWER Calcium sulfate
Which of these best describes the basis on which new scientific ideas are accepted
or rejected? - ANSWER Compelling evidence
The number of molecules in 48.0 grams of oxygen gas (O2) is - ANSWER 9.03 ×
1023
Al(s) + 3AgNO3(aq) → Al(NO3)3(aq) + 3Ag(s)
This equation represents which type of chemical reaction? - ANSWER
Single-replacement
In the formula for barium chloride, (BaCl2), barium (Ba) is written first because it
is - ANSWER the positive ion
Which of these laboratory techniques is best to separate a solid from a liquid to
recover the liquid? - ANSWER Filtering
Which of these is NOT required to ensure that stock solutions are free of
contamination? - ANSWER Store all solutions in brown bottles
The benefits of buying summaries with Stuvia:
Guaranteed quality through customer reviews
Stuvia customers have reviewed more than 700,000 summaries. This how you know that you are buying the best documents.
Quick and easy check-out
You can quickly pay through credit card or Stuvia-credit for the summaries. There is no membership needed.
Focus on what matters
Your fellow students write the study notes themselves, which is why the documents are always reliable and up-to-date. This ensures you quickly get to the core!
Frequently asked questions
What do I get when I buy this document?
You get a PDF, available immediately after your purchase. The purchased document is accessible anytime, anywhere and indefinitely through your profile.
Satisfaction guarantee: how does it work?
Our satisfaction guarantee ensures that you always find a study document that suits you well. You fill out a form, and our customer service team takes care of the rest.
Who am I buying these notes from?
Stuvia is a marketplace, so you are not buying this document from us, but from seller luzlinkuz. Stuvia facilitates payment to the seller.
Will I be stuck with a subscription?
No, you only buy these notes for $12.49. You're not tied to anything after your purchase.
Can Stuvia be trusted?
4.6 stars on Google & Trustpilot (+1000 reviews)
80461 documents were sold in the last 30 days
Founded in 2010, the go-to place to buy study notes for 14 years now