Master Chemistry with Fun Quizzes & Brain Teasers!

Fill in the blanksMatter is made up of tiny ___or pieces called ___.When lots of atoms are grouped____ together, we __________ matter.When atoms are ____ out, we ____ always see matter, because the particles are so ____.
1 Answer
Calculate the energy of a photon of radiation with a frequency of 8.5 x 104 HzUse this calculator to submit your answer in a decimal form.
1 Answer
Which of the following is not a characteristic of a compound?can be decomposed into simpler substances by chemical changescan be separated by physical meansalways in a definite ratiocan obtain new properties by chemical means
1 Answer
DUE TOMORROWIn each case below, the molecular formula for a compound is given. Determine the empirical formula for each compound.The problem: When a 0.3546 g sample of vanadium metal is heated in air, it reacts with oxygen to achieve a final mass of 0.6330 g. Calculate the empirical formula of vanadium oxide.
1 Answer
What is the contour interval of this map?
1 Answer
2H + O2 2HOIf you have 3.31 moles of hydrogen how many grams of oxygen are needed?
1 Answer
2Na3N + 3Ca(OH)2 Ca3N2 + 6NaOHIf you have 448.2 g of calcium hydroxide how many grams of sodium hydroxide can beformed?
1 Answer
The chemical formula for barium oxide is BaO.A chemist determined by measurements that 0.085 moles of barium oxide participate in a chemical reaction. Calculate themass of barium oxide that participates.Round your answer to 2 significant digits.
1 Answer
How many grams of calcium chloride will be produced when 27.0 g of calcium carbonate is combined with 11.0 g of hydrochloric acid?
1 Answer
Balance the chemical equation below using the smallest possible whole number stoichiometric coefficients.N(g) + H(g) NH3(g)
1 Answer
approximately 95 million barrels of oil are used daily worldwide. what would happen if this changed to 50 million barrels per day? what if it changed to 190 million barrels per day?
1 Answer
The decomposition of a single compound at 349 K has a rate constant of 4.10 x 10-3 M s1. If the initialconcentration of the reactant is 1.304 M, what is the concentration of the reactant after 90.45 seconds?(the answer should be entered with 3 significant figures; do not enter units; give answer in normalnotation-examples include 1.23 and 12.3 and 120. and -123)Selected Answer:Correct Answer:0.9330.933 1%
1 Answer
need part 3!! the following answers have been wrong: -42.12, -179.3, 30.514, -42.46, 60.8, -66.40, 777.614
1 Answer
Victor put a match on a balance and found that its mass was 6.0 grams. Then he lit the match and put it out after a few seconds.He put the partially burned match on the balance again. This time, its mass was 4.5 grams.Which of the following best explains what happened as the match burned? A. Some of the matter changed from solid to gas and went into the air. B. The matter moved to a different part of the match. C. Some of the mass was destroyed by the fire. D. The mass of the match combined with the mass of the fire.
1 Answer
Why were goods planned to become obsolete?A. So that the company would become known for quality goodsB. So that people would keep buying new thingsC. So that companies could protect their brandD. So that people could save as much money as possible
1 Answer
If a little bit of lead nitrate gets in contact with a persons eye will it cause serious issues?
2 Answers
A chemical reaction with a single reactant has a rate constant of 0.1161 s-1. Howlong (in seconds) does it take for the reaction to be 72.6% complete? How do you solve this problem?Ans: 11.2%
2 Answers
what colour would the methyl orange indicator be in the hydrochloric acid?
1 Answer
what is the equation for reaction
1 Answer
ABWhich of these twofrequencies of microwave has ahigher energy value?680 MHz450 MHz
1 Answer
What is the use of the following reagents in the various organic reactions? a. Carbon tetra chloride in the preparation of alkynes b. Hydrogen bromide in the preparation of alkynes
1 Answer
Use the next data listed below to calculate the enthalpy of formation (H0298) for MgCO3 (s.) at 298 K
1 Answer
a housewife used the aluminum can to keep vinegar. After sometime, it is found that the vinegar is spoiled. Give a reason.
1 Answer
Write the symbol for each isotope in the form Ax.(a) cobalt-60(b) neon-22(c) iodine-131(d) plutonium-244
1 Answer