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Chemistry
Chemistry
High School
A solution that has a pH of 5
Chemistry
College
What is the predictable process in which one element type is converted into a new form?Immersive Reader(10 Points)A. Law of SuperpositionB. Igneous formationC. Fossil formationD. Radioactive decay
Chemistry
College
The heat of fusion for naphthalene is 0.148 kJ/g. Calculate the heat energy in joules required to melt 52.95 g of naphthalene.
Chemistry
College
what's the summary of matter
Chemistry
College
Which element is classified as a noble gas?
Chemistry
College
NEED HELP ASAP !Which best describes an element?A. elements are chemicals that are pure substance held together by chemical bondsB. elements are mixtures of protons, neutrons, and electrons in different combinationC. elements are chemicals that are pure substances represented by symbols that have at least one capital letterD. elements that are chemicals that are formed when temperature change happens or a precipitate forms
Chemistry
College
Radiation is transferring thermal energy by=circulating fluidstouching/physical contactelectromagnetic wavesnone of the abovewhich one is correct
Chemistry
High School
How did Thomson's experiment change Dalton's atomic model?A. Thomson discovered that atoms changed properties when put inan electric field.B. Thomson discovered that atoms did not rearrange when formingcompounds.C. Thomson discovered that atoms of one kind of element couldhave different masses.D. Thomson discovered that the atom contained smaller particlescalled electrons.
Chemistry
College
Be sure to answer all parts.Write a balanced equation for each reaction. Do not include states of matter to your equation.H2 + O2 H20
Chemistry
College
A student throws a 0.46kg bowling ball at a velocity of 25m/s what is the kinetic energy of the bowling ball in Joules
Chemistry
High School
Select the measurement with that represents the least amount of pressure.Select one:a. 3 atmb. 3.039 x 1013 Pac. 2.280 x 10^3 mm Hgd. 40 psi
Chemistry
College
What is the correct 1 letter code for the amino acid sequence Glutamic Acid-Histadine-Tyrosine Select one: a. E-H-Y b. G-H-T c. Q-H-T d. E-H-T
Chemistry
High School
Solid substance A has a melting point of 100C. Liquid substance B has a freezing point of 110C. For each substance, identify its state of matter and describe the motion of its particles when the substance is at 115C.
Chemistry
High School
How many grams are in 2.75 moles of Calcium
Chemistry
High School
Help plzzzzz ASAP!!!!!!!
Chemistry
College
A graduated cylinder is filled to an initial volume of 25mL. A solid object is dropped into the graduated cylinder. The final volume of the graduated cylinder is 60mL. The mass of the object is 140g. What is the density of the solid object?
Chemistry
High School
identify the elements given the orbital diagrams listed below.
Chemistry
College
Please help with number 7 thank you! 30 points
Chemistry
High School
What do Lucille's cells need in order for her body to function properly? How might a problem with Lucille's respiratory system lead to low levels of oxygen in her cells? Why does having low levels of oxygen in her cells make it difficult for Lucille to play soccer?
Chemistry
High School
Regina conducted an investigation to determine whether earthworms add nutrients to soil. She used two pots of soil. She added three earthworms to the first pot. She did not add any earthworms to the second pot, which was the control. Regina tested the nutrient levels of the soil in both pots after two weeks. What type of investigation is Regina conducting?
Chemistry
High School
With an average acceleration of 0.50 m/s?, how long will it take a cyclist starting fromrest to reach 13.5 m/s?
Chemistry
College
The initial pressure of a mixture of C6H6 and an excess of H2 in a rigid vessel is 1.21 atm. A catalyst is introduced. After the reaction reaches completion, the temperature is restored to its initial value. The final pressure in the vessel is 0.839 atm. What was the mole fraction of C6H6 in the original mixture
Chemistry
College
Help :( the blue boxes are clickable
Chemistry
College
Choose all the answers that apply.Ionic compounds _____.-do not dissolve in water-have high melting points-have low melting points-dissolve easily in water-conduct electricity when melted
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