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Luda [366]
3 years ago
15

What makes up nearly all of the atom's mass?

Chemistry
2 answers:
VMariaS [17]3 years ago
7 0
Sum of the number of protons and neutrons, which is the nucleus
Ber [7]3 years ago
5 0

Answer:

The Nucleus

Explanation:

The nucleus of an atom contains both the protons (positively charged particles) and the neutrons (particles with no charge) - these two set of particles present in the nucleus of an atom determines the mass of an atom. Hence, atomic mass is the sum of the number of protons and number of neutrons present in the nucleus of an atom.

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What type of matter is gravel
GREYUIT [131]

Gravel is a solid, opaque, heterogenous mixture.

5 0
3 years ago
What is exchanged between the system and the surroundings ​
BartSMP [9]

Answer:

see note under explanation

Explanation:

When describing system and surroundings the system is typically defined as the 'object of interest' being studied and surroundings 'everything else'. In thermodynamics heat flow is typically defined as endothermic or exothermic. However, one should realize that the terms endothermic and exothermic are in reference to the 'system' or object of interest being studied. For example if heat is transferred from a warm object to a cooler object it is imperative that the system be defined 1st. So, with that, assume the system is a warm metal cylinder being added into cooler water. When describing heat flow then the process is exothermic with respect to the metal cylinder (the system) but endothermic to the water and surroundings (everything else).

8 0
3 years ago
A 232 mL cup of whole milk contains about 27 mg of cholesterol. Express the cholesterol concentration of the milk in kilograms p
son4ous [18]

Explanation:

Cholesterol concentration = 27 mg/ 232 mL

Change unit mg/ml to kg/m³

1 kg = 1000 g

1 g = 1000 mg

1 kg = 1000000 mg

1 kg = 10⁶ mg

10⁶ mg = 1 kg

1 mg = 10^-6 kg

m³ = 1000 L

1 L = 1000 mL

m³ = 1000000 mL

m³ = 10⁶ mL

10⁶ mL = m³

1 mL = 10^-6 m³

Cholesterol concentration = 27 mg/ 232 mL

27 × 10^-6 kg/ 232 × 10^-6 m³

= 27/232 kg/m³

6 0
3 years ago
Examples of conduction
Sonja [21]

Answer:

Conduction: Touching a stove and being burned. Ice cooling down your hand. Boiling water by thrusting a red-hot piece of iron into it.

Explanation:

3 0
3 years ago
Physical properties of Ammonium <br> Sulphate
Sliva [168]

the physical properties of ammonium  sulphate are colorless gas, less dense than air, pungent shell, very soluble in water, alkaline gas

6 0
3 years ago
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