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What will make an atom without an electrical charge? (1 point)
Responses
An equal number of protons and electrons, because electrons are positively charged and protons are negatively charged.
An equal number of neutrons and electrons, because neutrons are positively charged and electrons are negatively charged.
An equal number of protons and electrons, because electrons are negatively charged and protons are positively charged.
More electrons than protons, because electrons are negatively charged and protons are positively charged, and electrons are much smaller than protons
An equal number of protons and electrons, because electrons are negatively charged and protons are positively charged.
If a substance is made of a single element, it is(1 point)
Responses
made of one atom.
made of one type of atom.
made of multiple types of atoms that have chemically bonded together.
made through chemical reactions.
made of one type of atom.
Question
The image shows a model of sulfuric acid. In the middle is one yellow ball. Four red balls are attached to the yellow ball with sticks. Two of the red balls have a blue ball attached with sticks. In total, there is 1 yellow, 4 red, and 2 blue balls.
The image is a model of sulfuric acid that has a chemical formula of H2SO4. In 1-2 sentences, explain why creating models, like the one shown in the image above, is important in understanding substances.
(2 points)
Creating models like this one is important in understanding substances because they allow us to visualize the arrangement of atoms and better understand the structure and properties of the substance.
Use the chemical equation to complete the activity.
2Cu+S→Cu2S
Copper (Cu) reacts with sulfur (S) to form copper sulfide as shown in the equation. A scientist adds 12.7 grams of Cu to 3.2 grams of S to start the reaction. In this reaction, all of the copper and all of the sulfur react. Before running the experiment, the scientist expected the products of the reaction will be a total of 15.9 grams of copper sulfide (Cu2S). In 1–2 sentences, explain the law that the scientist used to predict that the product of the reaction would be 15.9 grams of copper sulfide.
(2 points)