During Mr. Nye's science class, students were expected to identify various substances using physical properties they could easily measure. Mr. Nye gave each of the five groups a green, metal cube. The students had to identify what metal the cube was made of. The length of each side was 3.0 cm and the mass was 270 grams.

Answers

Answer 1

Answer: Given the length of each side of a cube and its mass, the density can be obtained which can then help identify the type of material it's made of. This is because density is a unique and intrinsic property of materials. For this problem, the density is determined to be 10g/cm^3. Looking at a table of densities, the metal is most likely actinium, which has an exact density of 10 g/cm^3.

Answer 2

Answer:

Answer:Density

Explanation: The students should compute the density of the cube. Density is a physical property that can be used to identify most pure substances. The students know the length of a side so they can compute the volume. They also know the mass. Using the density formula, density =

mass

volume

, they can compute the density and identify the metal.

Related Questions

How many grams of acetylene react if 1.10 mil of CO2 are produced
Write the correct representation of an element x which consists of 15 electron and 16 neutron?
What is the role of an enzyme? a. speeds up biochemical reactions b. causes biochemical reactions c. is a product in biochemical reactions d. provides extra heat for biochemical reactions
What would happen if the secondary fuse in the aerial firework was too short?
How many moles are in 98.3 grams of aluminum hydroxide, Al(OH)3?

What is the total number of electrons shared in a double covalent bond?(1) 1 (3) 3
(2) 2 (4) 4

Answers

The correct answer is option 4. In a double covalent bond, two pairs of electrons are bonded or there is a total of four electrons being shared in a bond. For example, we have oxygen. Two atoms of oxygen share two pairs of electrons to have a stable structure.

Which of the following is an acid-base neutralization reaction? (1 point) Sn + 2HBr yields SnBr2 + H2 HCl + KOH yields KCl + H2O 2AlCl3 + 3Ca(OH)2 yields 2Al(OH)3 + 3CaCl2 2C2H6 +7O2 yields 4CO2 + 6H2O

Answers

Answer:

Explanation:

Sn + 2HBr = SnBr₂ + H₂

Here HBr is an acid but Sn is not a base . It is a metal . So it is not an acid - base reaction .

HCl + KOH = KCl + H₂O

HCl is an acid and KOH is a base so it is an acid base reaction.

2AlCl₃ + 3Ca(OH)₂ = 2Al(OH)₃ + 3CaCl₂

It is an acid base reaction . It is so because aluminium hydroxide is a lewis acid and calcium hydroxide is a base . So it is an acid base reaction .

2C₂H₆ +7O₂ = 4CO₂ + 6H₂O

It is not an acid base reaction . It is actually an example of oxidation reaction in which ethane burns in oxygen to give carbon dioxide and water.

Which substance is an electrolyte
1) CCl4
2)SiO2
3)C6H12O6
4) H2SO4

Answers

The substance that has been acting as an electrolyte from the given molecules is sulfuric acid. Thus, option 4 is correct.

Electrolytes have been defined as the chemical substances that has been dissociated into constituent ions when dissolved in the aqueous solution.

Identifying electrolytes

The ionic compounds are bounded by weak intermolecular forces and are dissociated into ions in the solution. Thus, the compounds are given as electrolytes.

The covalent bonded molecular atoms are not dissociated into ions and are not considered as electrolytes.

The substance that has been acting as an electrolyte from the given molecules is sulfuric acid. Thus, option 4 is correct.

Learn more about electrolytes, here:
brainly.com/question/14566383

Electrolyte is any species which when dissolved in solvent particularly water dissociates into cations and anions. Electrolytes are conductors of electricity. In given options;

CCl₄ (Tetrachloromethane) is a covalent compound. And it doesn't dissociate to any cation or anion. So it is not electrolyte.

SiO₂ (Silicon Dioxide) is also covalent in nature and exist in giant framework. It is not electrolyte.

Glucose (C₆H₁₂O₆) is also covalent compound. And doesn't produced any ion in water, hence it is not electrolyte.

H₂SO₄ (Sulfuric acid) is Electrolyte. When it is dissolved in water it produces H⁺ and SO₄²⁻ ions as follow,

H₂SO₄ → 2 H⁺ ₍aq₎ + SO₄²⁻ ₍aq₎

Result:
H₂SO₄ is electrolyte.

A person pushes horizontally with a force of 220. N on a 56.0 kg crate to move it across a level floor. The coefficient of kinetic friction is 0.21. (a) What is the magnitude of the frictional force? (b) What is the magnitude of the crate's acceleration?

Answers

Explanation:

(a) As it is given that there is no vertical displacement. Hence, the forces on y-axis are equal and opposite.

Also, it is known that F = mg

So, F = $56 kg * 9.8 m/s^(2)$

= 548.8 N

Also, $F_(f) = \mu N$

where, $\mu$ = coefficient of kinetic friction

N = force calculated

Putting the values into the formula as follows.

$F_(f) = \mu N$

= $0.21 * 548.8$

= 115.25 N

Hence, the magnitude of the frictional force is 115.25 N.

(b) Now, let us assume that the acceleration is towards the positive x-direction.

$F - F_(f) = ma$

$548.8 N - 115.25 = 56 * a$

a = 7.74 $m/s^(2)$

Therefore, the magnitude of the crate's acceleration is 7.74 $m/s^(2)$ .

Earth's first semi-permanent atmosphere consisted of abundant water vapor, carbon dioxide, nitrogen, ammonia, and traces of methane. these gases came from

Answers

organic compounds from the Cambrian era

Calculate the number of molecules in 210 grams of H2O

Answers

The number of molecules in 210 grams of H₂O is 72.48 x 10²⁴.

What are moles?

The mole is a SI unit of measurement that is used to calculate the quantity of any substance. The number of models of any substance can be calculated by dividing the mass by the molar mass of the substance or compound.

Mole = mass / molar mass

Given the mass of wateris 210 grams

The molar mass of water is 18.01g/mole

The mass and the molar mass will be divided.

210 / 18.01g = 11.653 mole

Now, here 1 mole is 6.22 x 10²³ molecules, so the 6.22 x 10²³ will be multiplied by the 11.653 to get the molecules of 210-gram water.

1 mole has 6.22 x 10²³ molecules

11.653 mole x 6.22 x 10²³ = 72.48 x 10²⁴

Thus, the number of molecules of H₂O is 72.48 x 10²⁴.

To learn more about moles, refer to the link:

brainly.com/question/21323029

#SPJ2

H2O=18.01g/mole. 210g divided by 18.01g/mole=11.653mole. 1 mole has 6.22x10^23 molecules. So there is 11.653x(6.22x10^23) molecules. Just multiply 11.653 by 6.22. Then put it as answerx10^23 molecules

Other Questions

Disccuss what happens to copper in photochromic lenses from a redox perspective.

Which net change occurs in a nuclear fusionreaction? (1) Ionic bonds are broken. (2) Ionic bonds are formed. (3) Energy is converted to mass. (4) Mass is converted to energy.

Unknown element X combines with oxygen to form the compound XO2. If 44.0 grams of element X combines with 8.00 grams of oxygen, what is the atomic mass of element X?A. 16 amu B. 44 amu C. 88 amu D. 176 amu E. 352 amu

What is the volume 0.0023 moles of CO2