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Chemistry
Chemistry
High School
What increases acidity more, nitrile group or chloride group?
Chemistry
College
A ratio that compares the length and width of a garden is what type of model?A. PhysicalB. ConceptualC. ComputerD. Mathematical
Chemistry
Middle School
Which two models would be most useful in predicting weather?A. A mathematical model based on data B. A plastic model of a cloudC. A map that shows wind patterns D. A peach used to represent Earth
Chemistry
College
What is an example of a physical change?A. having less ash than the paper that was burned to form itB. ice forming and then melting back into waterC. rust having a different identity than the iron it forms onD. the irreversible reaction of vinegar and baking sodaWhat one would you guys choose?
Chemistry
High School
Pluto's average distance from the Sun is about 3,666,000,000 miles. What is this in inches?
Chemistry
High School
Which is one precaution to take when working with heat and fire?O Do not use during experimentsO Keep flammables away.O Avoid touching face and eyes.O Do not mix chemicals unless told to do so.
Chemistry
College
i am timed please help
Chemistry
High School
Why is chemistry known as the "central" science?A.because chemistry involves the study of the central parts of matterB.because chemistry is fundamental to understanding the other sciencesC.because chemistry is always studied after biology and before physicsD.because chemistry deals with processes that affect living and nonliving things
Chemistry
High School
Which of the following metals is most reactive?a. Mgb. Rbc. Csd. Li
Chemistry
Middle School
Now, demonstrate a net force of 300 N to the right. How many ways can you do it?
Chemistry
College
An object is a regular, rectangular, solid with dimensions of 2 cm by 3cm by 2cm. It has amass of 24 g. Find its density.
Chemistry
High School
For the following situations, describe the contact and non contact forces that are involved.A. A book sitting on a shelfB. A soccer player kicking a ball; the ball soaring through the air and landing on the groundC. A hiker in the woods reading her compass to determine which direction to goD. A child on a sled; first, the child is sitting at the top of the hill, waiting his turn; then, the child pushes off and slides down the hill, eventually coming to a ston
Chemistry
College
Where did I go wrong? I know the 2.58 is the right answer but where did I go wrong in my work? Please help!!
Chemistry
High School
11. Calculate the number of atoms of sodium in a 4.5-gram sample.A 1.2 x 1023 atoms NaB 2.5 x 1023 atoms NaC 1.7 x 10-22 atoms NaD 3.1 x 1024 atoms Na
Chemistry
High School
If you were in Canada and purchased a 1 kg apple at the grocery,how many grams were in the apple?
Chemistry
High School
Matt's cube, after 5 trial, had an average destiny of 7.40. g/cm what is it made of ?
Chemistry
High School
difference between halogens and group 0 elements
Chemistry
College
6.300x10-5 7.200x10-3
Chemistry
College
An element has a mass number of 9 and 5 neutrons. What element is it?
Chemistry
College
Is matter smooth and continuous?
Chemistry
High School
The charge is affected by (more than 1 may be correct)a. protonsb.massc.electronsd.neutrons
Chemistry
High School
ANSWER ASAPPWhat is a compound?
Chemistry
High School
What is the volume of a 200 gram sample of gold if its density is known to be 20.5 g/mL?
Chemistry
High School
Which of the following is a reaction between an acid and a base?HCI + NaOH + H2O + NaClCaCl2 + K25 + CaS + 2KCINaCl + AgNO3 NaNO3 + AgClC3H8 + 502 + 3CO2 + 4H2O
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