There are 12 inches (in). in 1 foot (ft). which expression can be used to find the number of inches in 2.5 feet?
Answers
12 inches in 1 foot
number of inches in 2.5 feet
2.5 feet * 12 inches/1foot = 2.5 * 12 inches = 30 inches
1 foot + 1 foot + 0.5 foot = 2.5 feet
12 inches + 12 inches + 6 inches = 30 inches
12 inches : 1 foot = x : 2.5 feet
12 inches * 2.5 feet = x*1foot
30 inches * feet = x * foot
30 inches = x
Answer:
A:
Explanation:
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During a scientific investigation, which step will a scientist perform first?
Answers
->
Hence, option B is correct.
What is a balanced equation?
A balanced equation is an equation for a chemical reaction in which the number of atoms for each element in the reaction and the total oxidation numbers is the same for both the reactants and the products.
->
represents a balanced chemical equation.
Learn more about the balanced equation here:
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Answers
Answers
Answer:- A. is not the correct formula.
Explanations:- Charge for Ba is +2 and charge for O is -2, Here the charges are in equal and opposite so their ratio is 1:1 and hence the formula must be BaO and not .
Rest of the formulas are correct as charge for Ca is +2 and charge for N is -3 . On criss cross we get the formula .
Charge for K is +1 and charge for Cl is -1 and so KCl is correct.
Charge for Li is +1 and that for S is -2. On criss cross we get the formula .
Answers
Answer: Given statement is true.
Explanation:
When two or more substances mixed together then it results in the formation of mixture.
For example, a mixture of sand and water.
Mixtures are not chemically combined species because they can be separated by physical methods like filtration, distillation etc.
Hence, we can conclude that the given statement, mixtures can be separated by physical changes is true.
Answers
The nucleus of an atom is positively charged and the electrons are negatively charged therefore, the nucleus of an atom attracts the electrons around it and this nature is called nuclear charge.
What is the nuclear charge?
Each electron in an atom experiences two kinds of force one is an attraction to the nucleus and another is repulsion from other electrons. The presence of many electrons makes more repulsive force and this decreases the nuclear attraction.
The amount of nuclear charge is the positive charge experienced by an electron that is present in a multi-electron atom. The attractive interaction between the nucleus of an atom and electrons of the same atom increases with the increase of positive charge (+Ze) on the nucleus.
This attraction for the valence electrons will be lower because of the Shielding of inner shell electrons. Due to the shielding of inner-shell electrons, the valence electrons will not experience the positive charge of the nucleus entirely while electrons close to the nucleus feel maximum attraction and have the lowest energy.
Learn more about nuclear charge, here:
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Answer:
a) Let's balance the chemical equation for the reaction between HCl and HNO3 to form NOCl, Cl2, and H2O:
First, write the unbalanced equation:
HCl + HNO3 → NOCl + Cl2 + H2O
Now, balance it step by step:
1. Balance the atoms other than hydrogen and oxygen:
HCl + HNO3 → NOCl + Cl2 + H2O
1 1 1
2. Balance the oxygen atoms by adding water (H2O):
HCl + HNO3 → NOCl + Cl2 + H2O
1 1 1 +1
3. Balance the hydrogen atoms by adding HCl on the left side:
HCl + HNO3 → NOCl + Cl2 + H2O
1 1 +1 1 +1
4. Balance the chlorine atoms by adding Cl2 on the left side:
HCl + HNO3 → NOCl + Cl2 + H2O
1 1 +1 1 +1
Now, the equation is balanced.
b) Let's balance the chemical equation for the reaction between CO and I2O5 to form CO2 and I2:
First, write the unbalanced equation:
CO + I2O5 → CO2 + I2
Now, balance it step by step:
1. Balance the atoms other than carbon and oxygen:
CO + I2O5 → CO2 + I2
1 1
2. Balance the oxygen atoms by adding CO2 on the left side:
CO + I2O5 → CO2 + I2
1 1 +2
3. Balance the carbon atoms by adding CO on the left side:
CO + I2O5 → CO2 + I2
1 +1 +2
4. Balance the iodine atoms by adding I2 on the left side:
CO + I2O5 → CO2 + I2
1 +1 +2 +5
Now, the equation is balanced.