Answer:
B. Spring balance - a device used for measuring the weight or force of gravity acting on an object.
Explanation:
A Force is any interaction that changes the motion or position of an obkpjectbthatbit is interacting with. Whenever there is an interaction between two objects, there is a force exerted by each of the objects on one themselves.
Forces are generally divided into contact forces and non-contact over field forces.
In contact forces, the two objects physically in contact with each other. Examples of contact forces are push or pull forces, frictional forces, tensional forces, spring forces, etc.
Non-contact forces are forces in which the two objects interacting do no need to be physically in contact with one another. Examples include, gravitational forces, magnetic forces, electrical forces, etc.
Instruments used in measuring forces are known as force gauges.
From the instruments listed above:
A. A ruler is an instrument used in measuring length
B. Spring balance is a device used for measuring the weight or force of gravity acting on an object.
C. A thermometer is an instrument used in measuring temperature
D. A windbvane is an instrument used in measuring wind direction.
One would be phosporous whose configuration is 1s2 2s2 2p6 3s2 3p3
as a heterogeneous mixture
Explanation:
because I just know that it is
The total number of elements that one particular element can bond to can be determined by simply drawing the Lewis structure of the element.
Place the chemical symbol
Then look at the group number = valence electrons
Distribute the valence electrons around the atom.
C = 4 bonds
N = 3 bonds
O = 2 bonds
Answer:
1) The mass of water lost = 7.7892 grams
2) Z = 3: Cu(NO3)2*3H2O
Explanation:
<u>Step 1: </u>Data given
Mass of copper (II) nitrate hydrate, Cu(NO3)2•zH2O = 34.8243 grams
Mass of substance after heating = 27.0351 grams
Molar mass of Cu(NO3)2 = 187.56 g/mol
Molar mass of H2O = 18.02 g/mol
<u>Step 2:</u> Calculate mass of water
The mass of water is the mass lost after heating.
Mass water = 34.8243 - 27.0351 = 7.7892 grams of water
<u>Step 3:</u> Calculate moles of Cu(NO3)2
Moles Cu(NO3)2 = Mass Cu(NO3)2 / Molar mass Cu(NO3)2
Moles Cu(NO3)2 = 27.0351 grams / 187.56 g/mol
Moles Cu(NO3)2 = 0.144 moles
<u>Step 4:</u> Calculate moles of H2O
Moles H2O = 7.7892 grams / 18.02 g/mol
Moles H2O = 0.432 moles
<u>Step 5:</u> Calculate Z
z = moles H2O / moles Cu(NO3)2
Z = 0.432/0.144
Z = 3
This means we have 3 water molecules in the formula. This makes the formula ofthe hydrate: Cu(NO3)2*3H2O
