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What is the density of an object that weighs 14.5g and has a volume of 0.99cm^3
Answer:
The answer is
14.65 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
mass of object = 14.5 g
volume = 0.99 cm³
The density of the object is
[tex]density = \frac{14.5}{0.99} \\ = 14.64646464...[/tex]
We have the final answer as
14.65 g/cm³Hope this helps you
Answer:
14.65 g/cm³
happy to help ya
Explanation:
Which of the following choices is a goal of science?
Answer
science aims to explain and understand
Explanation:
What do all the organelles endoplasmic reticulum and nucleus so far have in
Common
Answer:
These have the ability to digest intracellular macromolecules such as proteins, lipids and sugars. The functioning of the Golgi apparatus and ER are both so closely linked to the lysosomes that together, these entities compose the endomembrane system.
Explanation:
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How are pure substances and mixtures different
13
Which one is heavier? 1 mole of Pbd,, 1 mole
of H, and 1 mole of Pb(NO3)2
A. Pbd
В. Н,
C. С None of them
D. Pb(NO3)2
Answer:
1 mole of Pbd - 239.3 g
1 mole of H - 1.008 g
1 mole of Pb(NO3)2 - 331.2 g
So D
Explanation:
1 mole of lead nitrate is heavier as it is a compound and is composed of three different kinds of atoms.
What is a compound?
Compound is defined as a chemical substance made up of identical molecules containing atoms from more than one type of chemical element.
Molecule consisting atoms of only one element is not called compound.It is transformed into new substances during chemical reactions. There are four major types of compounds depending on chemical bonding present in them.They are:
1)Molecular compounds where in atoms are joined by covalent bonds.
2) ionic compounds where atoms are joined by ionic bond.
3)Inter-metallic compounds where atoms are held by metallic bonds
4) co-ordination complexes where atoms are held by co-ordinate bonds.
They have a unique chemical structure held together by chemical bonds Compounds have different properties as those of elements because when a compound is formed the properties of the substance are totally altered.
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What is the volume of 50.0 g of aluminum? The density of aluminum is 2.70 g/cm3
V ≈ 18.5 cm³
Explanation:Hi there !
density formula
d = m/V => V = m/d
V = 50g/2.7g/cm³
V = 18.(518) cm³
V ≈ 18.5 cm³
Good luck !
The volume of a rock sample is 8 cm3 and its density is 2 g/cm3 . What is the mass of the rock sample?
Answer:
The answer is 16 gExplanation:
The mass of a substance when given the density and volume can be found by using the formula
mass = Density × volumeFrom the question
volume of rock = 8 cm³
density = 2 g/cm³
The mass of the rock is
mass = 2 × 8
We have the final answer as
16 gHope this helps you
Answer:
16g
Explanation:
The formula is [ m = dv ] where d = density and v = volume.
m = 8 * 2
m = 16
Best of Luck!
Why are do some substances have larger or smaller densities than others?
Answer:
What is the particle model of matter?
How small are atoms and molecules?
How does the particle model of matter describe solids, liquids and gases?
How does the particle model of matter help us understand the process of diffusion?
How can materials be made to change their state?
How does the particle model of matter help us to understand changes of state in materials, such as melting, evaporation, condensation and freezing?
How are density, mass and volume related to each other?
How do the densities of solids, liquids and gases compare?
Which aspects of the particles in a given material influence the density of that material?
Why does oil float on water? Is this related to density?
How can the particle model of matter help us to understand expansion and contraction?
How does a gas exert pressure?
Is the pressure a gas exerts related to the number of gas particles? If so, how?
What happens to pressure when we change its volume and temperature?
Can you remember learning that matter can exist in three different states? What are the three states called?
Can you remember the properties of the different states of matter? Discuss this in your class. Look at the following diagram of the states of matter to help you. Remember to take some notes as you discuss in class.
Each state of matter behaves differently and the particles in each state behave differently. This diagram compares the particles in a gas, a liquid and a solid.
In this chapter we are going to review what we know about solids, liquids and gases. We are going to learn about a scientific model that can be used to describe how the particles in all three states behave. This model is called the particle model of matter and it will help us understand much more about the properties of solids, liquids and gases. Let's get started!
What is the particle model of matter?
scientific theory
phenomenon
disordered
uniform
random
reverse
controlled experiment
In the previous chapter we learnt that scientists use models when they want to describe things that are difficult to understand. We discussed a model of the atom that helped us to imagine what atoms look like.
This model of the atom shows us where the different sub-atomic particles can be found. The sub-atomic particles shown here are the proton, neutron and electron.
Theories are similar to models. They explain scientific phenomena (things and events that can be described and explained in scientific terms) using pictures and words.
What does the particle model of matter teach us?
The particle model describes matter in a very specific way. It describes four important aspects of matter:
All matter is made up of particles that are incredibly small - much too small to see with the naked eye. The particles can be atoms or combinations of atoms that are bonded.
There are forces between the particles.
The particles in matter are always moving. The more energy they have, the faster they move.
The spaces between the particles in matter are empty. You might assume that the spaces between particles are filled with air, but this is not the case. They contain nothing at all.
If you need to, turn back to chapter 1 to revise the terms atom, element, compound and molecule and how they relate.
Why is the particle model of matter so useful?
The particle model of matter is one of the most useful scientific models because it describes matter in all three states. Understanding how the particles of matter behave is vital if we hope to understand science!
The model also helps us to understand what happens to the particles when matter changes from one state to another.
The following diagram shows different changes of state, as well as which processes are the reverse of each other. Melting and freezing are the reverse processes of each other and so are evaporation (boiling) and condensation.
Under special circumstances, a solid can change directly into a gas without melting first. This process is known assublimation and its reverse (when a gas changes directly into a solid without condensing first) is called deposition.
Nylon is an important component in many products. One step in the production of nylon is the reaction of cyclohexane with oxygen to give cyclohexanone and water, shown below in the balanced
reaction in line formula notation. Determine the energy change for this process using bond energies.
Answer:
Follows are the answer to this question:
Explanation:
pleas find the attachment file.
Formula for ΔE:
[tex]\Delta E = \sum \text{Bond energy of recatants}- \sum \text{Bond energy of Products}[/tex]
[tex]= 6 ( B.E_{C-C}) +12 (B.E_{C-H}) +(B.E_{o \ = \ o}) - 6(B.E_{C-C})-10(B.E_{C-H}) -( B.E_{C=0}) -2(B.E_{0-H})\\\\ = \bold{2 (B.E_{C-H}) +(B.E_{o \ = \ o}) -( B.E_{C=0}) -2(B.E_{0-H})}\\\\[/tex]
to calculate the value for ΔE put the value in above formula:
What is different about the particles in the three state of matter?
Answer:
liquids, gases, solids
Explanation:
Solids atoms are tightly packed which causes them to have no room and little vibration. Gases have a lot of room which causes them to bounce. And liquids have H2.o which means there atoms are spread very far apart. HOPE THIS HELPED!!
Which of the following electron configurations are written incorrectly?
1s22s32p6
1s22s22p63s23p64s23d5
1s22s22p63s23p3
4s23d104p7
3s1
2s22p4
Answer:
The electronic configuration that are incorrectly written is 1s²2s³2p⁶, 4s²3d¹⁰4p⁷, 3s¹ and 2s²2p⁴.
Explanation:
The electronic configuration of the elements corresponds to how all the electrons of an element are arranged in energy levels and sub-levels.
There are 7 energy levels —from 1 to 7— whose sublevels are described as s, p, d and f.
All electronic configurations begin with the term "1s" —corresponding to the sublevel s of level 1— so 4s²3d¹⁰4p⁷, 3s¹ and 2s²2p⁴ are incorrectly written. In addition, 4s²3d¹⁰4p⁷ is written incorrectly because is impossible to jump from the sublevel "s" to the sublevel "d" —which is found from level 3 and up— without passing through the sublevel "p".
In the case of 1s²2s³2p⁶, the wrong thing is that the sublevel "s" can only hold two electrons, not three.
The other options are correctly written.
Ap sublevel has 3 electrons. How should they be arranged
A.)Two electrons in the first p orbital and one in the second p orbital
B.)All electrons are in the first orbital
C.)One electron in each p orbital
D.)One electron in the first shorbital and 2 in the second
Hey
Answer:
C.)One electron in each p orbital
Explanation:
In a P-sublevel with 3 electrons, they should be arranged with one electron going into each p-orbitals.
This is in accordance with the Hund's rule of maximum multiplicity.
The rule states that "electrons go into degenerate orbitals or sub-levels(p,d and f) singly before paring up".
Since the p-orbital is 3-fold degenerate with a capacity to accommodate a maximum number of 6 electrons, given 3 electrons, they will follow the Hund's rule in order to fill the orbitals.
So one electron will go in each p - orbitals easily.
Calculate the volume of a substance if the mass is 30 g and the density is 3.0 g/ml
S H O W A L L C A L C U L A T I O N S
How does temperature affect mass?
Answer:
Increasing temperature increases vapor pressure, which speeds up outgassing and evaporation, both of which reduce the mass of the object of interest
Changes in ______move matter from one state to another.
temperature
pressure
density
location
Answer:
temperature
Explanation:
Rewrite the following chemical formula in dissociated ion form.
KI (aq)
A. K+ + I-
B. K2+ + I2-
C. K+ (aq) + I- (aq)
D. K2+ (aq) + I2- (aq)
plz hurry
Answer:
Explanation:
KI (aq)+ H2O(l) ----- K +1 (aq) + I - 1 (aq)
11.select the correct description for the atoms below
Answer:
maybe a
Explanation:
An atom has the following three isotopes: 24 amu (percent abundance = 78.99%)25 amu (percent abundance =10.00\%) , and 26 amu (percent bundance=11.01\%) . Calculate the average atomic mass. What is the identity of this atom based on your calculation?
1. The average atomic mass of the element is 24.32 amu
2. The identity of the atom is Magnesium (Mg)
Let the 1st isotope be A
Let the 2nd isotope be B
Let the 3rd isotope be C
From the question given above, the following data were obtained:
For Isotope AMass of A = 24 amu
Abundance of A (A%) = 78.99%
For Isotope BMass of B = 25 amu
Abundance of B (B%) = 10%
For Isotope CMass of C = 26 amu
Abundance of C (C%) = 11.01%
Average atomic mass =?The average atomic mass of the atom can be obtained as follow:
Atomic mass = [(Mass of A × A%)/100] + [(Mass of B × B%)/100] + [(Mass of C × C%)/100]
= [(24 × 78.99)/100] + [(25 × 10)/100] + [(26 × 11.01)/100]
= 18.9576 + 2.5 + 2.8626
= 24.32 amu
Therefore, the atomic mass of the atom is 24.32 amu.
From the periodic table, the element having atomic mass of 24.32 amu is Magnesium (Mg).
Therefore, the identity of the atom is Magnesium (Mg)
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Need help can somebody help me please
Answer:
A. filtration
B. distillation
C.magnet
D. evaporation
Explanation:
Identify Give two examples of chemical properties.
1. Ethanoic acid is a weak acid and hydrochloric acid is a strong acid.
Answer: true
Explanation: The hydrochloric acid is the strong acid used in a labratorical experiments
But in other wise ethanoic acid
Is a weak acid used in day to day activities.
The pressure of a 250 mL sample of gas is 105 kPa. What would be the pressure if the volume were increased to 375 ml?
Answer:
The answer is 70 kPaExplanation:
In order to find the pressure if the volume were increased to 375 ml we use Boyle's law
That's
[tex]P_1V_1 = P_2V_2[/tex]
where
P1 is the initial pressure
P2 is the final pressure
V1 is the initial volume
V2 is the final volume
Since we are finding the final pressure
[tex] P_2 = \frac{P_1V_1}{V_2} \\ [/tex]
From the question
P1 = 105 kPa = 105 , 000 Pa
V1 = 250 mL
V2 = 375 mL
So we have
[tex]P_2 = \frac{105000 \times 250}{375} = \frac{26250000}{375} \\ = 70000[/tex]
We have the final answer as
70 kPaHope this helps you
Which physical property is used to be Indentify the ability to dissolve
Answer:
solubility
Explanation:
solubility is a measure of how much a substance will dissolve in a solvent.
!PLEASE HELP! !URGENT! 25 POINTS
What process in stars played a role in the formation of the universe?
a) evoluton
b) nuclear reactions
c) photosynthesis
d) radiation
Answer:
b
Explanation:
It would be b because of the bang that happened
The movement of electrons is what type of energy? A. Charge energy B. Kinetic energy C. Magnetic energy D. Electrical energy
Answer:
The movement of electrons is kinetic energy, capable of producing electrical energy (option B).
Explanation:
An electron is a mobile subatomic particle, located outside the atom and forming elliptical orbits, unlike protons and neutrons. In addition, each electron has a negative charge.
The energy on which the movement of the electrons depends is kinetic energy, which promotes this movement. The interaction between the negative charges of the electrons and the positive charge of the protons produces electrical energy.
The other options are not correct because the charge energy, electric energy and magnetic energy are consequences of the activity of the subatomic particles of the atom.
Answer:
D) Electrical energy
Explanation:
Hello! This is the correct answer! (I took the K12 test) If you are having any further trouble, please review the lesson. Hope this helps! Have a blessed day! :)
Please help I need help fast please
Answer:
1 is h
2 is a
3 is
4 is e
5 is d
6 is
7 is g
8 is
9 is b
10 is f
Mark as brainliest if you answer it right.
Samantha noticed her hands get colder in winter than other exposed parts of her body such as her face and neck.
A 4.24 kg marble slab has the volume of 1564 cm3 What is the density in g/cm3
Answer:
The answer is
2.71 g/cm³Explanation:
The density of a substance can be found by using the formula
[tex]density = \frac{mass}{volume} \\[/tex]
From the question
volume of marble = 1564 cm³
1 kg = 1000 g
4.24 kg = 4240 g
mass = 4240 g
The density is
[tex]density = \frac{4240}{1564} \\ = 2.710997442...[/tex]
We have the final answer as
2.71 g/cm³Hope this helps you
When the mass of the boron atom is calculated, the mass of the electrons is ignored. Why is the mass of the electrons ignored?
Answer:
Because electron mass is so insignificant compared to proton and neutron mass that it can be ignored.
Explanation:
It takes more force to move an object with less mass.
True or false
Answer:
False
Explanation:
Answer:
False
Explanation:
