The correct expression of 25800000 in scientific notation is__________________
A. 25.8x10^6
B. 2.58 x 10^7
C.0.258 x 10^8
D. 258 x 10 ^6
Observe the following numbers a. 0.0000340 b. 234.010 c. 234 b. 2.00 c. 345988 d. 0.01030 The numbers with three significant figures is________________
a. A, B, C
b. C, D, F
c. A, C, D
d. C, E, F
Solve the following operation and choose the option with correct answer according to the significant figures rules
25.621 cm + 148.2 cm + 894.1 cm =
The option with the correct answer is________________
A. 1067.921
B. 1068
C. 1067.92
D. 1067.9
789.2 x 35 =
The option with the correct answer is ________________________
A. 2.7622 X 10 ^4
B. 2.8 X 10 ^4
C. 2.76 X 10 ^4
D. 3.0 X 10 ^4
The correct expression of 9.23 x 10^-5 in scientific notation is _____________
A. 923000
B.0.0000923
C.0.000923
D.92300000
Color State of matter Shape Lenght Mass Magnetism Volume Texture Density Are:
A. physical properties
B. Chemical properties
D. Physical and chemical properties
E. none of the above
The average kinetic energy of a system is known as:
A. mass
B. matter
C. heat
D. temperature
Read the following question abstract A student is working in the lab with 30ml of HYDROCHLORIC ACID and 2 grams of COPPER SULFATE. He must wear the safety google to prevent any injuries. The data in the text above refer to the following (respectively)
A. mass and volume
B. volume and weigh
C. weigh and volume
D. volume and mass
The properties that do not depend on the amount of matter, such as melting point are known as______
A. extensive
B. intensive
C. physical
D. chemical
Which of the following is a physical change?
A. wood burning in a fireplace
B. water freezing
C. iron rusting
.D. digesting food
The physical state of copper at 25 C (room temperature) is_________________
A. solid
B. Liquid
C. gas
D.plasma
The most abundant state of matter in the universe is known as_____________
B. liquid
C. Plasma
D. Bose Einstein
Which of the following properties defines a liquid?
A. it has its own shape
B. its particles are close together and move randomly
C. its particles move very rapidly
D. it fills the entire volume of the container
Read the following information I. Sublimation II. melting III condensation IV freezing V evaporation
Two examples of chemical changes that are endothermic are_______________________
A. I and II
B. III and IV
C. I and III
D. V and IV
Read the following information i. Sublimation II. melting III. condensation IV. freezing V. evaporation
Two examples of chemical that are endothermic are______________
A chemical equation resembles the behavior of reactants and products, in which the atoms involved are the same type and amount in both sides. This fact is an example of the _____________
A. Law of mass conservation
B. Law of multiple proportions
C. Law of definite proportions
D. Law of force conservation
Which of the following is an example of a homogeneous mixture?
A. sand dissolved in water
B. table sugar
C. gasoline with water
D. ball bearings in a box
An example of a heterogeneous mixture is
A. sand mixed with oil
B. salt dissolved in water
C. air
D. coffee
Mayonnaise, ketchup and peanut butter are examples of ________________
A. colloids
B. suspensions
C. elements
D. solutions
The difference between a solution and a suspension is that _________________
A. the solution is uniform and the suspension has different phase
B. the suspension is uniform and the solution has different phases
C. the solution has a solute and solvent, but the suspension only the solute
D. the suspension has a solute and solvent, but the solution only a solute
Compounds are pure substances that by definition consist of ___________________
A. a single element
B. oxygen and hydrogen
C. two or more elements in combination
D. solids
The state of matter achieved at an absolute zero based on the Kelvin temperature scale is known as
B. plasma
C. Bose Einstein
D. gas
Which scientist's experiment was crucial for the work that Thomson performed to state that atoms where composed of parts and that one of them was electron?
A. W. Crookes
B. H. Becquerel
C. Rutherford
D. Democritus
The scientist that proposed the Atomic Theory, which explains different aspects about the atom and its properties is known as ______________
A. John Dalton
D. Democrithus
Was a New Zealand chemist who has become known as the father of nuclear physics. In 1911 he was the first to discover that atoms have a small charged nucleus surrounded by largely empty space and are circled by tiny electrons. He is also credited with the discovery of the proton in 1919 and hypothesized the existence of the neutron. He was awarded the Nobel Prized in Chemistry in 1908 for his investigation into the disintegration of the elements and the chemistry of radioactive substances.
The previous information refers to:
A. W. Crockes
Write the chemical name of the following chemical symbols a. Si b. Na C. Mn D. Cr E. Hh
Write the chemical symbol of the following chemical names a) Aluminum b) Radium c) Silver d) Copper
Classify elements into metals, nonmetal and metalloids a) Polonium b) Tin c) Tellurium d) Cobalt e) Fluorine
Which is the valance electrons of the following elements a) Strontium b) Iodine c) Lead d) Rubidium c) Xenon
What are the names in English of the following families a) #2 b) #8 c) #7 d) #6 e) #1
What is the chemical name of the elements located in. a) Group 12, period 4 b) Family 6, period 8 c) Halogens, period 5 d) Period 3, group 11 e) Actinides, 5th element f) Alkali metals, period 3 g) Boron family, period 3 h) Period 5, group 11 I) Lanthanides, element 2 j) Period 2, noble gases
Write the oxidation number of the following elements a) Barium b) Bismuth c) Aluminum d) Chlorine e) Beryllium
