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What determines the temperature of an object at the molecular level?

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What is the difference between two atoms of carbon having the same number of neutrons? A. nothing B. the number of protons C. the number of electrons D. there may be differences in how they react with oxygen

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Which is a property of acids in aqueous solutions?

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What forms as a result of the erosional processes of weathering? Select all that apply. Soil Lava Sediment Sand

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Different microscopic organisms cause different diseases. When a dangerous microscopic organism is transferred from one person to many people, the disease it carries will spread. Why is this considered a theory instead of a hypothesis or a law? a. It is a statement of fact about how nature works instead of an explanation. b. It provides an explanation for many observations and accepted hypotheses. c. It describes how to test a possible explanation of one specific relationship. d. It has not changed over time even though new technology has been developed. — Which statement is a scientific law? a. Scientists use genes to explain why evolution happens. b. Genes are long patterns that are similar to computer codes. c. A person’s traits are controlled by different forms of a gene. d. The discovery of genes changed how scientists think about life. — Different microscopic organisms cause different diseases. When a dangerous microscopic organism is transferred from one person to many people, the disease it carries will spread. Why is this considered a theory instead of a hypothesis or a law? a. It is a statement of fact about how nature works instead of an explanation. b. It provides an explanation for many observations and accepted hypotheses. c. It describes how to test a possible explanation of one specific relationship. d. It has not changed over time even though new technology has been developed. — Which is the order of microscopes, from greatest magnification to the least? a. scanning tunneling → transmission electron → compound light b. scanning tunneling → compound light → transmission electron c. transmission electron → scanning tunneling → compound light d. compound light → transmission electron → scanning tunneling

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What is the molecular geometry, or shape, of chloroform (CHClÀ)? A.tetrahedral B.trigonal pyramidal C.linear D.trigonal planar

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Help!Which elements can form basic compounds? Check all that apply. sulfur rubidium arsenic selenium silicon xenon antimony

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Stomach acid has a pH of about 2. What conclusion can you reach about the pH of an antacid solution that is used to neutralize excess stomach acid?

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What is the only element in group 1 of the periodic table that forms covalent bondhydrogen lithiumpotassium sodium

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How does a multicellular organism develop? The cells shrink. One cell grows bigger. The cells replicate to form exact copies. The cells differentiate.

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Which type of reaction is Mg + S -> MgSa. polymerization b. synthesisc. replacement d. decomposition

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Which element can form acidic compounds? Check all that apply. Sulfur rubidium arsenic selenium silicon zenon antimony Its not just silicon and arsenic

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Which is formed when a standard hydrogen half-cell is connected with a salt bridge to a standard zinc half-cell?

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How many atoms of phosphorus are represented by one formula unit of calcium phosphate? A. 3 B. 6 C. 9 D. 12 E. 18

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Which occurs when a warm fluid cools down? Energy is released to the environment. Energy is absorbed from the environment. The density of the fluid decreases. The mass of the fluid decreases.

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Conduction stops when all substances have equal masses different masses equal temperatures different temperatures

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Balanced equation for the equation between zinc and acetic acid

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Which of the following is not an empirical formula? A.C3H8O B.Sb2S3 C.C2N2H8 D.BeCr2O7

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6co2 (g) +h2O (/) C6H12o6 +6O2(g) what is the statement and why is an endothermic reaction?

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When sulfur reacts with magnesium it forms magnesium sulfide. what is the chager on the sulfur atom in magnesium sulfide?

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If the heat involved in a chemical reaction has a negative sign, A. heat is lost to the surroundings. B. heat is gained from the surroundings. C. no heat is exchanged in the process.

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An object heats up more quickly when it has ____ mass. A. more B. less C. no

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Hydrogen has only one electron in its only (and outer) electron shell. If a hydrogen atom were to absorb a tremendous amount of energy where would Bohr say the electron would go? A. fly off the atom B. nowhere, it would just speed up. C. spiral inwards towards the nucleus D. move up to another shell that would form

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Which material erupted from volcanoes is important in acid rain

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Which statement best describes balancing equations and the law of conservation of mass? A) There are more atoms in the reactants than in the products, and the total mass is the same in the reactants and in the products. B)The number of atoms is the same in the reactants and in the products, and the total mass is the same in the reactants and in the products. C) There are fewer atoms in the reactants than in the products, and the total mass is less in the reactants than in the products. D) There are more atoms in the reactants than in the products, and the total mass is higher in the reactants than in the products.

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What is the mass of a sample of water that increases the temperature of the water from 10 ºc to 15 ºc and absorbs 1200 j of heat?

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A solution with a ph of 7 must be _____. an acid a base neutral water

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The elements with the highest ionization energy and thus the most unreactive are:

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Why do elements in a group on the periodic table have similar chemical properties? a. similar atomic masses b. similar atomic numbers c. same number of outermost electrons d. same number of protons

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Which increases the rate of a chemical reaction? a. a catalyst b. a higher volume c. a lower pressure d. a lower temperature user: how does a catalyst appear in a chemical equation? a. it does not usually appear in an equation. b. it only appears on the product side of an equation. c. it only appears on the reactant side of an equation. d. it appears on both the reactant and product sides of an equation.

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