States of Matter
The substance that constitutes everything in the universe is known as matter. Matter comprises atoms which in turn are composed of electrons, protons, and neutrons. Different atoms combine together to give rise to molecules that act as a foundation for all kinds of substances. There are five states of matter based on their energies of attraction, namely solid, liquid, gases, plasma, and BEC (Bose-Einstein condensates).
Chemical Reactions and Equations
When a chemical species is transformed into another chemical species it is said to have undergone a chemical reaction. It consists of breaking existing bonds and forming new bonds by changing the position of electrons. These reactions are best explained using a chemical equation.
pleasssssse solve question 2
![Q1. The correct conversion expression between degrees °C to K is?
A. T(K)=t(°C) + 273.15
C. T(K)= [t(°C) -32]/1.8
B. T(K) 273-1(°C)
D. T(K)-1(°C)
Q2. The density of a metal is 13.6 g/cm³. The density of the metal is ------- kg/m³
A.1.36 × 10²
B. 1.36 x 104
C. 1.36 × 108
D. 1.36 x 10-5
Q3. Precision refers to how a measured number is close to
A. Other measured numbers
C. The calculated value
B. The true value
D. zero
Q4. Which of the following has the same number of significant figures as the number 1.0310?
B. 199.79
A. 100.0
C. 8.66
D. 5.119
Q5 A combination of sand, salt, and water is an example of a
A. Homogeneous mixture
C. Compound
A. 20p, 20n, and 18 e
C. 20 p, 22 n, and 18 e
B. Heterogeneous mixture
D. Pure substance
Q6. How many protons, neutrons, and electrons respectively are in
40
20
Ca²
B. 22 p, 20 n, and 20 e
D. 22 p, 18 n, and 18 e.
-Q8. Which combination of formula/name is incorrect
A. FeO/iron (II) oxide
CN₂O/ dinitrogen monoxide
D. 1.0
Q7. How many moles of oxygen atoms are there in 3.0 moles of Ca3(PO4)2?
A. 2.0
C. 4.0
B. 8.0
B. CrO3/chromium (VI) oxide
D. Fe2S3/iron (II) sulfide
Q9. How many oxygen atoms are present in a 5.00 mole sample of Al2(SO4)3?
A.9.03 x 1024
B.3.61 x 1025
C.3.01 x 1024
D. 1.20
mol) when 0.100](/v2/_next/image?url=https%3A%2F%2Fcontent.bartleby.com%2Fqna-images%2Fquestion%2Fad83a677-5c11-42ba-985c-5739bbbf887b%2F8c226eaf-82ab-4766-bd72-e3a51feb9c4c%2Fb9b4d8_processed.jpeg&w=3840&q=75)
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