Answer the following questions in the space provided.
1. Classify each of the following as a homogeneous or heterogeneous substance.
a. iron ore
b. quartz
c. granite
d. energy drink
e. oil-and-vinegar salad dressing
f. salt
g. rainwater
h. nitrogen
2. Classify each of the following as a physical or chemical change.
a. ice melting
b. paper burning
c. metal rusting
d. gas pressure increasing
e. liquid evaporating
f. food digesting
3. Compare a physical change with a chemical change.
Answer: iron ore is heter
quartz homo
granite heter
energy drink homo
oil-and vingar salad dressing heter
salt homo
rainwater homo
nitrogen homo
ice melting chemical
burning paper chemical change
Which of the following substances will dissolve in water? Check all that apply.
Magnesium Sulfate
Methane
Butane
Sodium nitrate
Answer:
The answers are A. and D.
According to the concept of solubility and properties of ionic compounds, magnesium sulfate and sodium nitrate dissolve in water.
What is solubility?Solubility is defined as the ability of a substance which is basically solute to form a solution with another substance. There is an extent to which a substance is soluble in a particular solvent. This is generally measured as the concentration of a solute present in a saturated solution.
The solubility mainly depends on the composition of solute and solvent ,its pH and presence of other dissolved substance. It is also dependent on temperature and pressure which is maintained.Concept of solubility is not valid for chemical reactions which are irreversible. The dependency of solubility on various factors is due to interactions between the particles, molecule or ions.
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12. (01.06 LC)
Which of the following is a property of a pure substance? (5 points)
It consists of different types of compounds.
It may have substances in different states of matter,
It is made up of a single element or type of compound,
Its components can be separated by employing physical methods.
Answer:
3rd one
Explanation:
dont have one, i think just think it makes most sense
Answer:It is made up of a single element or type of compound
Explanation: This answer is right because for something to be pure it has to only be made up of 1 thing.
Match each term with its definition.
a. The position of an equilibrium always shifts in such a direction as to relieve a stress applied to the system.
b. A molecule that donates a proton when it encounters a proton acceptor.
c. Occurs when a reaction involving an acid and its conjugate base is combined with a second reaction involving a base and its conjugate acid.
d. It ionizes completely when dissolved in water.
e. The shift in the position of equilibrium caused by the addition of a participating ion.
f. It only partially ionizes when dissolved in water.
g. It is capable of acting as either an acid or a base depending upon the solute.
h. The act of self-ionization of a solvent to produce both a conjugate acid and a conjugate base.
i. A chemical species that bears both positive and negative charges.
1. Week electrolyte
2. Bronsted-Lowry acid
3. Neutralization
4. Amphoteric solvent
5. Zwitterion
6. Auto-protolysis
7. Strong acid
8. Le Chåtelier's principle
9. Common effect
Answer:
The position of an equilibrium always shifts in such a direction as to relieve a stress applied to the system -Le Chåtelier's principle
A molecule that donates a proton when it encounters a proton acceptor.- Bronsted-Lowry acid
Occurs when a reaction involving an acid and its conjugate base is combined with a second reaction involving a base and its conjugate acid.- Neutralization
It ionizes completely when dissolved in water.- Strong acid
The shift in the position of equilibrium caused by the addition of a participating ion.- Common ion effect
It only partially ionizes when dissolved in water.- Weak electrolyte
It is capable of acting as either an acid or a base depending upon the solute- Amphoteric solvent
The act of self-ionization of a solvent to produce both a conjugate acid and a conjugate base.- Auto-protolysis
A chemical species that bears both positive and negative charges.- Zwitterion
Explanation:
In the answer box we have various chemical terminologies and their definitions. In answering the question, you must carefully read through each definition, then check what option best matches that definition from the options provided.
Each definition applies only to one terminology as you can see in the answer above.
In Natural selection, individuals whose unique characteristics are well-suited for an environment tend to survive and produce more offspring. true or false?
Answer: True
Explanation:
Find the number of moles of iron atoms obtain
from 320kg of iron (3) oxide
Answer:
320 kg of iron(III) oxide contain 4007.76 moles of iron atom.
Explanation:
Given data:
Mass of iron(III) oxide = 320 kg (320000 g)
Number of moles of iron atoms = ?
Solution:
First of all we will calculate the number of moles of iron(III) oxide.
Number of moles = mass/molar mass
Number of moles = 320000 g/ 159.69 g/mol
Number of moles = 2003.88 mol
1 mole of Fe₂O₃ contain 2 moles of iron atom.
2003.88 moles of Fe₂O₃ contain,
2003.88 ×2 = 4007.76 moles of iron atom.
the gram formula mass of NH4Br is what (please provide explanation, thank you)
Answer:
97.95 g/mol
Explanation:
Step 1: Define molar masses
Molar Mass of N - 14.01 g/mol
Molar Mass of H - 1.01 g/mol
Molar Mass of Br - 79.90 g/mol
Step 2: Find amounts of molar masses
1 mol N - 14.01 g/mol
4 mol H - 4.04 g/mol
1 mol Br - 79.90 g/mol
Step 3: Find molar mass of compound
Molar Mass N + 4 Molar Mass H + 1 Molar Mass Br
14.01 g/mol + 4.04 g/mol + 79.90 g/mol
97.95 g/mol
Enter your answer in the provided box.
A sample of chlorine gas is confined in a 7.17-L container at 491 torr and 37.0°C.
How many moles of gas are in the sample?
mol Cl2
Which organism on the geologic time scale are now extict
Answer:The Ordovician and Cambrian Periods are referred to as the "age of invertebrates", with trilobites abundant. In this period, brachiopods became more abundant that the trilobites, but all but one species of them are extinct today.
Explanation:
What is the precise volume of the liquid
If you've ever shifted realities, How long did it take you?
Answer:
2 days.
Explanation:
what is the name of CH3CH2CH2C(O)CH2CH3
Answer:
1-methoxypropane
Explanation:
An element is lustrous, brittle, and silver colored. What type of element is it
Metal
Metalloid
Non Metal
Other
Will give brainlist
I need help with these 2 problems ASAP please.
This is not chemistry but i could not find science
(THIS QUESTION IS FOR SCIENCE)
Answer:
1. is sickle-cell anemia and 2. is phenyketonuria
Explanation:
Where is the north pole of the bar magnet, based on the magnetic field lines
shown?
Answer:On the Right End
Explanation: Trust me I just got it wrong on APEX to answer it for y’all On the right end is the correct answer
Answer:
Right end
Explanation:
Just did the quiz
The combination of two or more atoms, from the same or different elements, creates a(n).
a. element
c. molecule
b. atom
d. mixture
Please select the best answer from the choices provided
Pls help!!!! Fast!!!
B
С
D
Answer:
c Molecule
Explanation:
cuz science
What is the volume of 26.1 g of a substance if the density of the substance is 0.28 g/mL?
Answer:
It is 93.2
Explanation:
It's that answer because if you divide volume and density that's what you get
which statement describes how technology has increased our information on Mars?
A. The Curiosity rover found sulfur compound in rocks.
B.The Curiosity rover located methane in soil samples.
C. The Curiosity rover detected carbon in organic molecules.
D. The Curiosity rover discovered helium in underground pockets.
Answer:
Either D or C. I'm so sorry if I got you the wrong answer
Answer:
c
Explanation:
in an experiment it was found that the total charge on an oil
drop was 5.93 X 10^-18 C How many negative charges does
the drop contain? (#51)
Answer:
37 negative charges.
Explanation:
We're being asked to determine how many negative charges a drop contains from an oil drop experiment where the total charge was 5.93x10-18 C. The drop contains 37 negative charges.
It was stated and identified that we are to attempt question #51 alone.
From the given information;
The total charge on an oil drop = 5.93 × 10⁻¹⁸ C
According to Oil drop experiment carried out by Robert Milliken in (1910);
In the oil drop laboratory experiment, It was possible for Him to substitute oil for water (because water quickly evaporate). Robert Milikan adjusted the electrical voltage among the two metal plates while the oil drop continues to drop until it stopped. When the drop was stopped, the gravitational downward force on the oil drop was equivalent to the electrical upward force on the charges thereby enabling Robert Millikan to be able to estimate the electrical charge drop.
Robert Milliken identified that the magnitude of a single negative electron charge is:
= 1.6 × 10⁻¹⁹ C
∴
If in an experiment, the total charge = 5.93 × 10⁻¹⁸ C
Then;
The number of negative charges in the oil drop can be calculated as;
[tex]\mathbf{=\dfrac{5.93 \times 10^{-18}}{1.6 \times 10^{-19}}}[/tex]
= 37.063 negative charges
Therefore, we can conclude that the numbers of negative charges contained in the total drop = 37.063.
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Living things help contribute to the water cycle.
A. true
B.false
1. A camper named Bob ran into aliens on a trail. Bob made friends with the aliens so he could
steal their treasure of 1 zygot.
1 zygot = 3 trigots
3 trigots = 2 bigots
4 bigots = 1 gram gold
How many grams of gold did Bob take from the aliens?
Answer : The number of grams of gold Bob take from the aliens will be 0.5.
Explanation :
As we are given that:
1 zygot = 3 trigots
3 trigots = 2 bigots
4 bigots = 1 gram gold
Now we have to determine the number of grams of gold Bob take from the aliens.
The number of grams of gold Bob take from the aliens will be equal to:
[tex]\frac{1\text{ zygot}}{1}\times \frac{3\text{ trigots }}{1\text{ zygot}}\times \frac{2\text{ bigots }}{3\text{ trigots }}\times \frac{2\text{ gram gold}}{4\text{ bigots }}[/tex]
= [tex]\frac{6}{12}[/tex] gram gold
= [tex]\frac{1}{2}[/tex] gram gold
= 0.5 gram gold
Hence, the number of grams of gold Bob take from the aliens will be 0.5.
is a granite a mineral or a rock
Answer:
Rock
Step-by-step explanation:
It's an igneous rock
I hope this helps!
2. Using the following data, calculate the average atomic mass of magnesium (give your answer to the nearest
.01 ) : Show all work!
Isotope: Mg Percent abundance: 78.70%
24
Isotope: 'Mg Percent abundance: 10.13% 25
Isotope: Mg Percent abundance: 11.17% 26
Answer: 24.309amu
Explanation:
Describe the function of a cilia.
Answer:
hope it helps..
Explanation:
'Motile' (or moving) cilia are found in the lungs, respiratory tract and middle ear. ... These cilia have a rhythmic waving or beating motion. They work, for instance, to keep the airways clear of mucus and dirt, allowing us to breathe easily and without irritation.
Answer: to keep airway clear of mucus and dirt allowing us to breathe easy
Explanation:
A element is having atomic number 82. find the number of its protons and electrons
Answer:
The number of its protons and electrons are 82 each
Explanation:
Atomic no of an element = 82
Atomic no = No of protons
⇒ No of protons = 82
Electrons are negatively charged particle and Protons are positively charged particles.
No of electrons = 82
Hence, the element is Lead with 82 protons and electrons
A sample is left on the desk over several hours. On examination, the crystals appear moist, andliquid is forming around them. The compound is classified as:
a. Stableb.
b. Deliquescent
c. Efflorescentd.
d. Hygroscopic
Answer:
c. Efflorescent
Explanation:
Some hydrated salts, when exposed to the atmosphere, give off part of all of their water of crystallization spontaneously to form a lower dehydrated or anhydrous salt. Such salts are known as efflorescent and the phenomenon is called Efflorescence.
Efflorescence occurs when the hydrate's aqueous vapor pressure is greater than the water vapor's partial pressure in the air. For example, because the vapor pressures of washing soda (Na2CO3·10H2O) and Glauber's salt (Na2SO4·10H2O) normally exceed that of the water vapor in the atmosphere, these salts effloresce (i.e., lose all or part of their water of hydration), and their surfaces assume a powdery appearance.
Please helpppp!!!!!! It's 6th-grade thermal energy science.
Answer:
b?
Explanation:
The answer is C: Radiant energy from the sun travels through the glass, is absorbed by the black pot, and reflected by the aluminum foil.
Pleaseee helpppp this is thermal energy in 6th rade and i need it quick for a formal assesment!!!!!!
Answer:The answer is B my child
Explanation:
I NEED AN ANSWER PLEASE!
A element is having atomic number 82. find the number of its protons and electrons
Answer:
the element is lead
Explanation:
the atomic number of lead is 82.
number of protons 82
number of electrons 82
Identify the placement of items A-E using the drop-down menus.
A)
⇒No
⇒Yes
B)
⇒No
⇒Yes, when liquid or solution
⇒Yes, when solid
C)
⇒No
⇒Yes
D)
⇒No
⇒Yes
E)
⇒No
⇒Yes
Answer:
A=no
B= yes when liquid or solution
C=yes
D=no
E=yes
Explanation:
According to the given table, the placement of items A-E are
A) ⇒ No
B) ⇒Yes, when liquid or solution
C) ⇒Yes
D) ⇒No
E) ⇒Yes
What is conductivity and Malleability?
Malleability - Those metals that can be beaten into thin sheets with a hammer or any heavy object. For example - Cu, Au etc
Conductivity - Conductivity is the measure of the ease at which an electric charge or heat can pass through a material. For example - Metals are good conductors of heat and electrolytic solution is conductors of electricity.
Therefore, according to the given table, the placement of items A-E are
A) ⇒ No
B) ⇒Yes, when liquid or solution
C) ⇒Yes
D) ⇒No
E) ⇒Yes
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