In SI units, land area is measured in hectares (1ha =1hm2) The commonly used unit for land area in the United States is the acre.   How many acres correspond to 4 ha? (1mi2 = 640 acres,1mi = 5280ft, 1ft = 12in).

Q: A sample is found to contain 8.47×10-6 g of salt. Express this quantity in nanograms.

A: Given that Mass of sample (salt) = 8.47 × 10-6 g Mass of sample  = ? ng

Q: The concentration of mercury in a polluted lake is 0.33 micrograms per liter of water. What is the…

A: Given,Volume of the lake = 1.5 x 1012cm30.33 micrograms per liter of water

Q: O. In chemistry, the particles of matter that we encounter are quite small. The size of atoms were…

A: radius of Chlorine atom = 0.99

Q: A formula 1 race car averages about 1.25 km/L. Show how to determine and then calculate this mileage…

A: Coverting km to miles:

Q: Chlorine is used to disinfect swimming pools. The accepted concentration for this purpose is 1 ppm…

A: Given : Mass of water in swimming pool = 8.45 X 104 gallons  Mass percent of chlorine = 6.00 %  And…

Q: The average person's step covers 2.5 feet. Some health experts recommend getting 10,000 steps a day.…

A: First we need to calculate the distance covered in feet in 10,000 steps using the average step…

Q: A 330 mg piece of gold (density = 19.3 gcm3) is hammered into a sheet of gold leaf that has a length…

A: Please see the attached image for the solution.  If there are queries or if the image is not…

Q: Use unit analysis to show how to calculate the volume occupied by 16.6 grams of lead. (The density…

A:

Q: In 1999, scientists discovered a new class of black holes with masses 100 to 10,000 times the mass…

A:

Q: A homogeneous mixture was prepared by mixing 0.90 g A, 105.7 g B and 48.17 g C. The volume is found…

A: Given, Volume of mixture = 56.6 cm3 Mass of A = 0.90 g Mass of B = 105 .7 g Mass of C = 48.17 g

Q: What are 2 cups of chocolate chips converted into nanograms? 1 cup of chocolate chips = 170 g 1…

A:

Q: Express the following in SI base units using scientific notation (e.g., 1.45 mm = 1.45 × 10-3 m):…

A: Given : 432 kg

Q: A protein is 600 micromole per liter. The molecular mass is 68,500 g/mol. What is the…

A:

Q: Express each answer with the correct significant digits, and the proper units AND write it in…

A: The expression given is .

Q: tration of the insulin stock solution is 400. units/500. mL. How many units of insulin per hour is…

A: A unit of insulin is the most basic measure of insulin, U-100 is the most common concentration of…

Q: An atom of a particular element has a volume of 7.8 x 10-31 m3. What is this volume in cubic…

A: An atom is always neutral because of the equal number of electrons and protons. Electrons are…

Q: 3. The method of volume displacement can be used to find the volume of a solid. In this measurement,…

A: Given : Mass of silver = 194.3 g Initial volume of water = 242.0 mL Final volume of water (after…

Q: The mass of Earth is 5.98 ×10^24kg. What is the mass expressed in tera-grams?

A: Given: The mass of the earth = 5.98×1024 kg We have to find the mass in teragrams.

Q: If the radius of the sun is 7.001×105  km, what is the average density of the sun in units of grams…

A: Density can be calculated as: Density=MassVolume

Q: 3 1 1 1 1 Part 1: Convert units of volume. In chemistry, volume is usually reported in units of…

A: Since you have asked multiparts, we will solve the first three subparts for you. If you want any…

Q: The volume of water in large scale reservoirs is often measured in units of an acre-foot, which is…

A: 1 acre-foot = 43,560 ft³ 1 US liquid gallon = 231 cubic inches 1 US liquid gallon = 3.785 liters 1…

Q: The density of silver is 10.5 g/mL and that of gold is 19.3 g/ml. What volume of gold (in mL) has…

A: Since you have asked multiple question, we will solve the first question for you. If you want any…

Q: the density of mercury, the only metal to exist as a liquid at room temperature, is 13.6 g/cm^3.…

A: The density of mercury is given as 13.6 g/cm3 and it is required to convert this in pounds per cubic…

Q: What is the circumference in kilometers (km)? in meters (m) (1 mi = 1.6093 km)

A:

Q: A hectacre (1.0000 x 104 m2) is a metric unit of area analogous to an acre. How many square feet are…

A: 1 feet consists of 0.3048 m and 1 square feet consists of 0.093 m2. 1 hectare consists of 10000 m2 5…

Q: mass of the necklace

A: This is simply a question of density. As we know that by using concept of density, we can calculate…

Q: The metric system uses prefixes to represent larger or smaller amounts based on the number ten. What…

A:

Q: If an object as a density of 4.00 g/cm^3, what is its density in units of kg/m^3?

A: Given : density = 4.00 g/cm3

Q: Chlorine is used to disinfect swimming pools. The accepted concentration for this purpose is 1 ppm…

A: The values are given as follows:

Q: A student sets up the following equation to convert a measurement. (The ? stands for a number the…

A:

Q: Suppose you have 150. mL of a substance with a density of 36.0 g/dm³ and want to determine the mass…

A: In this question we need to use dimensional analysis for converting the units .  For this we use…

Q: If the price of gold is $1,318.61 per troy ounce (1 troy ounce is exactly 31.1035 grams), what is…

A: Given   The price of gold is $1,318.61 per troy ounce. The second given price is $1,000,000. The…

Q: Convert 7.2 qt to μL. Be sure your answer has the correct number of significant figures. Note:…

A: Quart (qt): It is a unit of volume commonly used in the United States for measuring liquids. It is…

Q: The mass of one atom or molecule of a substance is given in atomic mass units, also called Daltons…

A: Mass of one atom / molecule of a substance is given in atomic mass unit which is also called Dalton.

Q: A student sets up the following equation to convert a measurement. (The ? stands for a number the…

A: Convert mol/kg into mol/gram.

Q: The concentration of carbon monoxide (CO), a common air pollutant, is found in a room to be 5.7 x…

A: The volume of the room is calculated as following,

Q: A student wants 25.0 g of acetone for a chemical reaction. If the density of acetone is 0.791 g/mL,…

A: Density(D), Volume(V), and Mass(M) are related as below      D=MV ⇒V = MD = 25.0 g0.791 g/mL = 31.6…

Matter and Measurement

In the universe, there is matter, energy, and void space. The universe contains energy and void space. The definition of matter can be considered as something which possesses mass and consumes space. Chemistry is that branch of science which deals with the study of matter. Under chemistry, nature, composition, and the changes occurring to matter are discussed.