A copper penny has a mass of 6.2 grams and a volume of 0.70ml. What is the density of the penny

Answers

Answer 1

Answer: Given:
A copper penny has a mass of 6.2 grams and a volume of 0.70ml

Required:
density of the penny

Solution:
D = M/V where D is teh density, M is the mass and V is the volume

D = 6.2 grams/0.70 mL
D = 8.9 grams per milliliters

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Which kind of reaction is shown below?

2H2O2 → 2H2O + O2

Answers

The type of reaction is a redox reaction.

This is a redox reaction/equation.

Which element has chemical properties that are most similar to the chemical properties of sodium?(1) beryllium (3) lithium
(2) calcium (4) magnesium

Answers

Check out your periodic table. Elements in the same column (families) usually share similar properties because they have the same number of valence electrons. In this case, the only element listed that is part of Sodium's family is Lithium, so Lithium is most similar to Sodium.

Final answer:

Lithium is an element that has chemical properties most similar to sodium.

Explanation:

Out of the given options, lithium is the element that has chemical properties most similar to sodium.

Sodium and lithium are both in Group 1 of the periodic table, also known as the alkali metals. Alkali metals have similar properties because they all have one valence electron, which makes them highly reactive.

For example, like sodium, lithium reacts vigorously with water to produce hydrogen gas and a hydroxide:

2Li(s) + 2H2O(l) → 2LiOH(aq) + H2(g)

Learn more about Chemical properties here:

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Fluorine (F) and bromine (Br) are in the same group on the periodic table. How do atoms of these elements compare when they form bonds?

Answers

Answer:

they both gain one electron

Explanation:

they are both halogens and they each have one unpaired electron so that unpaired electron join together to make them form a bond

Answer:

Explanation:

Which substance represents a compound?(1) C(s) (3) CO(g)(2) Co(s) (4) O2(g)

Answers

The substance that represents a compound among the given options is CO. The correct answer is (3) CO(g)

From the question,

We are to determine which of the given substances is a compound.

First, we will define a compound

A compound is a chemical species that is formed when two or more atoms join together chemically, with covalent or ionic bonds.

A compound is a substance that contains atoms of two or more different elements, and these atoms are chemically joined together

NOTE: A molecule consisting of atoms of only one element is NOT a compound.

Among the given options, only CO satisfies the definition of a compound, because it contains two different elements, Carbon (C) and Oxygen (O).

Hence, the substance that represents a compound among the given options is CO. The correct answer is (3) CO(g)

Learn more here: brainly.com/question/12862037

C = Carbon
CO = Carbon Monoxide
Co = Cobalt
O2 = Oxygen

So the answer is (3) CO

What is the difference between gram positive and gram negative?

Answers

one is possitive and one is negatve

What does catalase do? Use the terms substrate and product in your response.

Answers

Catalase is an enzyme found in almost all living organisms exposed to oxygen. This catalyzes the decomposition of hydrogen peroxide. The substrate would be the hydrogen peroxide and the products are water and oxygen.

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