Answer:
D
Explanation:
1. It is lab day in science class! Mr Benson is out in the hall talking with other teachers when the bell
rings. Justin decides to go ahead and get started with the lab. He begins weighing chemicals, touching
ihem with his hands. He gets an itch in his nose and rubs it with his hand.
Question part in the given data is missing, however the missing part is as follows:
What safety rules were violated?
Answer:
The correct answer would be:
-Never work in the lab without teacher or adult present
-Keep chemicals away from hands and face.
-Do not touch lab supplies without permission
Explanation:
According to the lab safety and precaution rules one should follow the lab rules strictly to avoid any risk and mishap. These rules include, the chemical management, lab safety equipment, and many other rules including don not work in absence of teacher or the adult.
One should avoid touching chemical and equipment without permission of teacher and never touch chemicals with bare hand and not to touch chemical and keeps it from face.
How many elements are represented in the formula CaCO3
Answer:
3
Explanation:
calcium (Ca)
carbon(C)
oxygen(O)
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Answer:
3 different elements, 6 total in the Calcium Carbonate molecule
Explanation:
Ca=Calcium
C=Carbon
O=Oxygen (* 3)
What is the most important laboratory procedure to follow before leaving the lab area? A. Record all of your results in your lab notebook. B. Wash your hands thoroughly with soap and water. C. Make sure that rulers and thermometers are put away. D. Ask the teacher for permission to leave.
Answer:
Wash your hands thouroughly with soap and water
Explanation:
Guessing. Hope I get it right for a brainly
Answer:
B C E
Explanation:
are all correct
what type of matter can be physically separated
Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule
Answer:
Matter can be broken down into two categories: pure substances and mixtures. Pure substances are further broken down into elements and compounds. Mixtures are physically combined structures that can be separated into their original components. A chemical substance is composed of one type of atom or molecule.
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tell me answer........... fast
Answer:
45
Explanation:
1+4x1=5
2+5x2=12
3+6x3=21
5+8x5=45
All scientific discoveries are made in a
laboratory.
True
False
pls helppp
Answer:
i would say false.
Explanation:
some discoveries are made as people continue exploring the world...........they are just prooved in the laboratory, while there are other which are still made in the lab and are also examined there.
what do you think ionization means?
How do Atoms become Ions? Answer in 3 to 4sentences
What food is made up of gelatin and why does it have protein in it?
Answer:
gummy´s and it can be lofat gummy´s
Explanation:
If you have 45.6mL of a liquid and its
mass is measured at 46.83g, what is its
density? What liquid is it?
What is a sediment and how it is formed?
Answer:
Sedimentary rocks are formed when sediment is deposited out of air, ice, wind, gravity, or water flows carrying the particles in suspension. This sediment is often formed when weathering and erosion break down a rock into loose material in a source area.
Im not sure if this answers your question but here!
Sedimentary rocks are one of three main types of rocks, along with igneous and metamorphic. They are formed on or near the Earth’s surface from the compression of ocean sediments or other processes.
If 24.1 g of sodium hydroxide react with 22.0 g of hydrochloric acid to form 35.3g
of table salt, how much water was formed? *
Answer:
10.85 g of H2O.
Explanation:
We'll begin by writing the balanced equation for the reaction. This is given below:
NaOH + HCl —> NaCl + H2O
Next, we shall determine the mass of NaOH that reacted and the mass of H2O produced from the balanced equation.
These can be obtained as illustrated below:
Molar mass of NaOH = 23 + 16 + 1 = 40 g/mol
Mass of NaOH from the balanced equation = 1 × 40 = 40 g
Molar mass of H2O = (2×1) + 16 = 2 + 16 = 18 g/mol
Mass of H2O from the balanced equation = 1 × 18 = 18 g
Summary:
From the balanced equation above,
40 g of NaOH reacted to produce 18 g of H2O.
Finally, we shall determine the mass of water, H2O produced from the reaction as follow:
From the balanced equation above,
40 g of NaOH reacted to produce 18 g of H2O.
Therefore, 24.1 g of NaOH will react to produce = (24.1 × 18)/40 = 10.85 g of H2O.
Therefore, 10.85 g of H2O were produced from the reaction.
the particles in water have less mobility than the particles in oxygen. Which statement best explains this observation? Water is always colder than oxygen. Water has a lower density than oxygen. Water particles have a greater kinetic energy. Water particles have strong intermolecular forces.
Answer:
Water particles have strong intermolecular forces.
Explanation:
Water molecules are affected by attraction and repulsion and that causes the water to have strong forces and intermolecular strength to be strong.
Water particles have strong intermolecular forces.
What are intramolecular forces?Intramolecular forces are the forces that keep atoms together inside a molecule. Intermolecular forces are forces that exist among molecules. determine intermolecular appeal between H-Cl molecules and intramolecular attraction within H-Cl molecules.
What are the strongest intramolecular forces?The most powerful intermolecular forces are dipole-dipole interactions. A dipole-dipole pressure is while the high-quality aspect of a polar molecule draws the bad facet of every other polar molecule.
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Which elements are present in ammonia and calculate its mass
Answer:
nitrogen and hydrogen
Its molecular mass is 17g
Explanation:
Ammonia = NH3
nitrogen= 14g
hydrogen= 1g × 3 =3
14+3=17
Convert 0.95 kilograms into centigrams. (1 g = 100 cg; 1 kg = 1000 g)
Answer:
95,000 centigrams
Explanation:
There is 1000 CG in 0.01 kilograms
so you do 1000*95 which equals 95,000 centigrams.
Before Chemical Reaction
Mass of Vinegar (g)
Mass of Antacid Tablet (g)
75.83
1264
After Chemical Reaction
Mass of Chemical Reaction (kg)
0.08547
1. Explain how this chemical reaction represents the law of conservation of matter.
Answer:
This law states that, despite chemical reactions or physical transformations, mass is conserved — that is, it cannot be created or destroyed — within an isolated system. In other words, in a chemical reaction, the mass of the products will always be equal to the mass of the reactants.
What are octet and duplet rules ?
Answer:
DUPLET RULE: The tendency of an atom to acquire an outer most shell of two electrons is called duplet rule. OCTET RULE: The tendency of an atom to acquire an outermost shell of eight electrons is called the octet rule.
This type of cell contains a nucleus and organelles that are surrounded by membranes. A.prokaryotic B.eukaryotic C.unicellular D.bacteria
Answer:
b is the correct answer
A metal cube has a mass of 20 g and a volume of 5 ml. What is the density? Is the cube made of pure aluminum? Explain your answer in the "other" area. * A.2.7 g/mL B.4 g/mL C.100 g/ml D.Yes it is aluminum E.No it is not aluminum Other:__________________________________________________________
Explanation:
Given that,
Mass of metal cube, m = 20 g
Volume of cube, V =5 mL
We need to find the density of the cube. Mass per unit volume equals density.
[tex]d=\dfrac{m}{V}\\\\d=\dfrac{20\ g}{5\ mL}\\\\d=4\ g/mL[/tex]
So, the density of the cube is 4 g/ml.
We know that the density of Aluminium is 4 g/mL.
So, the cube is not Aluminium cube.
The density of Aluminium is 2.7 g/mL. The cube is not the Aluminium cube.So, option B and E is correct
Mass of metal cube, m = 20 g
Volume of cube, V =5 mL
The formula for density is as follows:-
[tex]Density=\frac{Mass}{Volume} \\\\[/tex]......(1)
Substitute 20 g for mass, and 5 ml for volume in the above equation as follows:-
[tex]Density=\frac{20\ g}{5\ mL} \\\\=4\ g/mL[/tex]
So, the density of the cube is 4 g/ml.
We know that the density of Aluminium is 2.7 g/mL. So, the cube is not the Aluminium cube. So option B and E are correct.
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Periodic Table: Which families are highly reactive? Which family is unreactive?
The families that have the highest reactivities are the a lkali metals and earth alkali metals . These are located far left on the periodic table. They are highly reactive because they have an shell with only 1 electron and need to complete the shell to become stable. The family that is unreactive is inert elements or noble gases.
The alkali metals (lithium family) are highly reactive while the noble gases (helium family) are highly unreactive.
What are alkali metals?The alkali metals are the elements of group 1 in the modern periodic table which are lithium (Li), sodium (Na), potassium (K), rubidium (Rb), cesium (Cs), and francium (Fr).
All alkali metal has their outermost electron in the s-orbital with the outer configuration ns¹. The alkali metals easily lose the outermost electrons to form cations with charge + 1. Therefore they are highly reactive and are stored under oil to stop the reaction with air.
The noble gases have completely filled electronic configurations. The noble gases have a general outer configuration ns²np⁶ so they have completely filled valence shell therefore, they do not feel any attraction for other atoms. Therefore, noble gases exist in monoatomic form. Therefore, noble gases are highly unreactive and also known as inert gases.
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Put 4.789 x 10^9 into standard notation.
Answer:
4789000000
Explanation:
When we multiply anything by 10, we follow the base 10 system rules.
All we simply have to do is move the decimal place 9 places to the right.
4.789 x 10⁹ = 4789000000
Answer:
4,789,000,000
Explanation:
4.789 × 10⁹
using 10⁹ = 1
-----
10⁹
4.789. 4.789
---------- = ---------------------
10⁹ 1,000,000,000
4.789 × 10⁹ = 4, 789, 000, 000
A "carat" is a unit of mass defined as exactly ⅕ of a gram. There are exactly 5 carats in a gram. How many carats would a 1.0 mL diamond have?
Answer:
17.55 carats
Explanation:
First, there is a need to know the mass of 1.0 mL of diamonds. The density of diamond is 3.51 g/mL and density is the ratio of mass and that of volume. Hence;
mass of diamond = density of diamond x volume.
Since the volume of the diamond is 1.0 mL and the density is 3.51 g/mL,
mass of 1.0 mL of diamond = 3.51 x 1.0 = 3.51 g.
1 g = 5 carats, therefore 3.51 g would be;
3.51 x 5 = 17.55 carats.
Hence, there would be 17.55 carats of diamond in 1.0 mL of diamond.
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Question 2
1 pts
mixture that is evenly spread throughout; also known as a homogeneous mixture.
O gas
O solid
O solution
O chemical property
Question 3
1 pts
state of matter with definite shape and volume.
Answer:
2. Solution 3.Solid
Explanation:
During freezing, a substance? -loses chemical energy -loses thermal energy -gains thermal energy -gains chemical energy
The process of melting a crystalline solid can be
reversed if the liquid is cooled. The change from the liquid state
to the solid state is called freezing. As the liquid cools, it loses
thermal energy. As a result, its particles slow down and come
closer together. Attractive forces begin to trap particles and the
crystals of a solid begin to form.
"The total kinetic energy of all the particles in a sample of
matter is called thermal energy. Thermal energy, an extensive
property, depends on the number of particles in a substance as
well as the amount of energy each particle has. If either the
number of particles or the amount of energy in each particle
changes, the thermal energy of the sample changes. With identically sized
samples, the warmer substance has a greater thermal energy."
The allowable concentration level of vinyl chloride, C2H3Cl, in the atmosphere in a chemical plant is 2.0 x 10-6 g/L. a. How many moles of vinyl chloride in each liter does this represent?
Answer:
3.2x10⁻⁸ moles of vinyl chloride per liter
Explanation:
The concentration of C₂H₃Cl is 2.0x10⁻⁶g/L. To find moles per liter we need to convert this mass to moles using molar mass of vinyl chloride:
Molar mass C₂H₃Cl:
2C = 2*12g/mol = 24
3H = 3*1g/mol = 3
Cl = 1*35g/mol = 35
Molar mass = 35g/mol + 3g/mol + 24g/mol = 62g/mol
2.0x10⁻⁶g * (1mol / 62g) =
3.2x10⁻⁸ moles of vinyl chloride per literPls answer I am confused PLEASE HELP
Answer:
Glucose is the carbohydrate produced by photosynthesis. Energy-rich glucose is delivered through your blood to each of your cells. ATP is the usable form of energy for your cells.
Explanation:
wafting the air above a chemical is one way to it directly
How much energy is passed to the next trophic level in the food chain?
Answer:
10%
Explanation:
Out of the original layer, only ten percent is transferred to the next
is water a compound?
Answer:
Yes, actually it is a compound.
Explanation:
There are important differences between the properties of a mixture and a compound. In this table, the column Mixture refers to the gasses hydrogen and oxygen, and the column named Compound refers to water.
what are factories tell answer
Answer:
a building or group of buildings where goods are manufactured or assembled chiefly by machine.
Answer:
Factorise is a way of writing an expression as a product of its factors using brackets.
Explanation:
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