which method is used to separate salt form salt solution
Explanation:
As we know, salt and water have different boiling points. Hence, we can use the "evaporation" technique to separate salt from salt solution. For this, one has to simply heat the salt solution till all the water boils and evaporates, and salt is left behind.
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Select the correct answer.
Which is true with respect to the kinetic energy of a molecule?
ОА.
it is the lowest at low temperatures
OB.
it increases at low temperatures
Oc it is the same at all temperatures
OD. it is the lowest at high temperatures
how to scientists know where to put electrons in the atom
a. probability
b. ratio and proportions
c. algebra
d. geometry
Answer:
a).
Explanation:
precise electron locations cannot be calculated, only predicted based on previous calculations. they cannot know whether or not an electron will be or will not be somewhere specific
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a change in the composition of matter _____________ occurs during a chemical reaction.
Answer: During a chemical change, the composition of matter always changes
Explanation:
Que relación tiene el metabolismo celular con el mantenimiento de los seres vivos
pls help i will give brainliest :)))) love youuuu
Answer:
i think the answer is C
Explanation:
if wrong im sorry
When does an electrically charged object attract another object?
A. When one object is far away from the other
B. When each object is negatively charged
C. When the objects are oppositely charged
D. When each object is positively charged
Answer:
C. When the objects are oppositely charged
Explanation:
Electrostatic interactions are commonly observed whenever one or more objects are electrically charged. Two oppositely-charged objects will attract each other. A charged and a neutral object will also attract each other. And two like-charged objects will repel one another.
From Bing, this is not my work
Answer:C
Explanation:
CCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCCC! lol i think its c
what happens when chocolate get heated?
hope it helps
?C6H6+O2 coefficient
Answer:
2C6H6
Explanation:
C6H6 + O2 = CO2 + H2
2C6H6 + 15O2 → 12CO2 + 6H2O
Using the formula velocity = distance/time, how fast does sound travel in air at 20 degrees C given a distance of 500 m and 3.92 seconds.
A- 3.92
B- 127 m/s
C- 2,941 m/s
D- 746 m/s
Answer:
B : 127m/s
Explanation:
= 500 ÷ 3.92
= 127.5
The photo shows a seismograph. It is a machine that detects earthquakes
and makes graphs of the waves made by them.
What is the medium of the wave being detected by this seismograph?
A. Paper
B. Ink
C. Air
D. Rock
Answer:
D is the correct option.
Explanation:
A seismograph detects seismic waves which travel through the Earth, that is mainly rock(taking from the options given)
Answer:
It is just rock!
Explanation:
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29. Which type of orbital is shown?
Z
Y
Х
Answer:
b
Explanation:
How many moles of Oz would be required to generate 13.0 mol of NO2
in the reaction below assuming the reaction has only 74.1% yield?
2 NO (g) + O2 (g) → 2 NO2 (g)
Answer:32
Explanation:
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Which term describes the total internal energy of a material due to the motion
of its particles?
A. Nuclear energy
B. Thermal energy
Ο Ο Ο
C. Electrical energy
D. Chemical energy
Answer:
Thermal Energy
Explanation:
Thermal energy is the total internal kinetic energy of an object due to the random motion of its atoms and molecules They consist of the sum of the internal kinetic energy (thermal energy) and the potential energy of an object.
Answer:
B. thermal energy.
Thermal energy or heat is due to the movement or vibrations of tiny particles such as atoms and molecules.
Explination:
Einstein proved the existense of atoms through his observation of Brownian Motion (the random movement of a dust particle, caused by it bumping into atoms).
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Which pair of elements has reactivity that is similar to Fluorine, F?
Answer:
halogens group 7A on the periodic
table
write a general equation for the reaction of an alkali metal with water.
Answer:
Alkali metals are highly reactive metals. These metals are that much reactive that they can even explode in the air as well. When alkali metals and water react with each other, there is a formation of metal hydroxide and the evolution of hydrogen gas.
The general representation of metal is A. so, the general equation for the reaction of an alkali metal with water is given below.
2A(solid)+2H2O(liquid) -------> 2AOH(aqeous)+H2(gas)
Kim loại đòng sắt đc tạo từ nguyên tố nào
Answer:
sup brö how is it back home?
Explanation:
just curious you know
.
Which of the following describes Pluto?
1. asteroid
2. moon
3. planet
4. dwarf planet
Answer:
4. dwarf planet
Explanation:
only_________are involved in forming chemical bonds betwen two atoms
a. s orbital electrons
b. p orbital electrons
c. valence electrons
d. innermost electrons
Answer:
c. valence electrons
Explanation:
Someone pls help me I will make you brain
Answer:
A
Explanation:
What type of reaction is represented by the chemical equation shown
below?
2PbO2 → 2PbO + O2
decomposition
single replacement
synthesis
deouble replacement
Answer:
Decomposition reaction
Explanation:
2PbO2 → 2PbO + O2
2PbO2 is reactant.
2PbO + O2 is the product.
Definition : -
Decomposition reaction is a chemical reaction in which a single reactant breaks down to simpler products.
What Group is this Element in?
O Group 3
O Group 4
O Group 7
Group 1
Answer: group 7
Explanation:
What makes a charged object attract an uncharged object?
The charge in both objects move around.
The charged object is positively charged.
The charges move in the uncharged object.
The uncharged object becomes negatively charged.
Answer:
its c I think C)
The reason for this is due to the phenomenon called "Charging by Induction". What that means is that when something with a charge, for example a negative charge, is brought near an uncharged one, it induces the opposite charge onto it (positive in this case) and therefore since opposites attract, it attracts it.
The reason for this is that since, just like a positive magnet rejects and pushed away like charges, the electrons hold a negative charge, they push away any electrons that may be in the neutrally charged item causing only protons to be left, thus creating an oppositely charged object. Or vice versa.
So whatever charge the object has, it induces the opposite charge into the uncharged object, causing the charges to move only in the uncharged one.
Explanation:
what is the main precaution to take if a gas cylinder sign is present in the lab?
Answer:
This symbol indicates that hazardous products with this pictogram are gases that are contained in a receptacle under pressure, or which are liquefied or liquefied and refrigerated. The hazards presented by these products are related to the high pressure or cold temperatures.
Hazardous products with this pictogram can be safely worked with if proper storage and handling practices are followed.
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The main precaution to take if a gas cylinder sign is present in the lab is Check sure the gas cylinder remains constrained visually, but remain a good distance from it.
What is gas cylinder?A gas cylinder is indeed a pressure vessel used to store and confine gases at pressures higher than atmospheric pressure. Bottles are another name for high-pressure gas cylinders.
Based on the physical properties of the contents, the held contents may be compressed gas, vapour over liquid, working fluid, as well as dissolved in a substratum inside the cylinder. The main precaution to take if a gas cylinder sign is present in the lab is Check sure the gas cylinder remains constrained visually, but remain a good distance from it.
Therefore, the precaution is to Check sure the gas cylinder remains constrained visually, but remain a good distance from it.
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Why do you think the term ionic is used to describe compounds formed from a metal element and a nonmetal element?
Answer:
All compounds form when atoms of different elements share or transfer electrons. Compounds in which electrons are transferred from one atom to another are called ionic compounds.
Explanation:
Because the positive and negative charges cancel out, an ionic compound is neutral in charge.
A gas has a volume of 275 mL and a pressure of 3 atm. What is the new volume if the pressure decreases to 1.8 atm?
Answer:
Use Boyles law.
Given:
P1=3atm
V1=275mL
P2=1.8atm
V2=?
P1V1=P2V2
3x275=1.8xV2
V2=3x275/1.8
V2=458.3mL
how would the rate of diffusion change if the po2 in the capillaries was 40 mmhg and the po2 in the muscle cell changed from 40 to 20 mmhg?
The rate of diffusion change would increase if the PO₂ in the capillaries was 40 mmHg and the PO₂ in the muscle cell changed from 40 to 20 mmHg.
Simple diffusion is the movement of molecular substances from a region of higher concentration to lower concentration. The mechanism with which the movement of O₂ travels from the blood to the body tissues takes place with the use of simple diffusion.
Now, if PO₂ changes from 40 → 20 mmHg in the muscle cells, and the PO₂ in the blood = 40mmHg. It implies that the pressure gradient(P) has increased. As such, there is an increase in the rate of diffusion of oxygen from the blood to muscle cells.
Learn more about diffusion here:
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If you weigh 60 pounds on Earth, your weight is _______on the moon (the moon has 1/6 the gravity of Earth).
Answer:
10 pounds
Explanation:
If the moon has 1/6 the gravity of earth, divide your weight on earth by 6 to find your weight on the moon
60 / 6 = 10 pounds
Which substance can not be broken down by a chemical change?
Answer:
Among the given substances, the one that cannot be broken down by a chemical change is arsenic.
Explanation:
Rawr
Answer:
the substances that cannot be broken down by a chemical change is arsenic.