Weegy: The model of the universe that suggests that the Sun is the center of the universe was first developed by: Copernicus. (More)

Weegy: If a sound is refracted away from the surface of the earth, [ this indicates that the air is cooler than the ground. ] User: Sound waves cannot travel through a/an Weegy: Sound waves cannot travel through a: vacuum. User: A wave with a period of 0.008 has a frequency of Weegy: A wave with a period of 0.008 second has a frequency of 125 Hz. User: What characteristic best explains when a loud noise echoes in a large room (More)

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Weegy: The purpose of an indicator is to test and determine the pH values of unknown solutions. User: A substance that turns litmus paper blue and contains hydroxide ions is most likely Weegy: If you find that a substance turns litmus paper to blue and contains hydroxide ions, it is most likely a base. User: The smallest unit of an element that has all of the properties of the element is a/an Weegy: The smallest unit of an element that has all of the properties of the element is an Atom. User: The valence of an element or radical us Weegy: The valence of an element or radical is equal to the number of positive or negative charges on the ion. User: Does cobalt produce a magnetic field? (More)

Weegy: All the following elements produce magnetic field except for copper. User: In the chemical equation Zn+2HCI the reactant is Weegy: In the chemical equation Zn + 2HCI > ZnCI + H, the reactants are Zinc and hydrochloric acid. User: The source of the sun's heat is nuclear Weegy: The source of the sun's heat is nuclear fusion. User: Regarding the formula AI2O3 which of the following is accurate Weegy: The subscript 2 indicates that two atoms of aluminum are present in the substance - is accurate regarding the formula Al2O3. User: A chemical reaction in which two or more substances undergo a chemical union to form a more complex substance is a _ reaction Weegy: A chemical reaction in which two or more substances undergo a chemical union to form a more complex substance is a "Combination reaction". User: Which of the following would increase the rate of a chemical reaction between hydrochloric acid and solid zinc metal? Weegy: Pulverizing the zinc metal into a fine powder would increase the rate of a chemical reaction between hydrochloric acid (HCl) and solid zinc metal (Zn). User: In nuclear reaction, energy is released by the combination of the two elements into a new element. This process is an example of Weegy: In a nuclear reaction, energy is released by the combination of two elements into a new element. This process is an example of nuclear fusion. User: Which of the following notations is the appropriate and final way to display the formula for magnesium chloride? Weegy: MgCl2 would be the appropriate and final way to display the formula for magnesium chloride. User: When two atoms of different elements come in contact, heat is given off and light is produced. Which of the following does this support? (More)