Answer:
Empirical formula is Cr₂O₃.
Explanation:
Given data:
Percentage of Cr = 68.4%
Percentage of O = 31.6%
Empirical formula = ?
Solution:
Number of gram atoms of Cr = 68.4 / 52 = 1.3 2
Number of gram atoms of O = 31.6 / 16 = 1.98
Atomic ratio:
Cr : O
1.32/1.32 : 1.98/1.32
1 : 1.5
Cr : O = 1 : 1.5
Cr : O = 2(1 : 1.5)
Empirical formula is Cr₂O₃.
which common substance is an acid?
Answer:
sulfuric acid, phosphoric acid, and nitric acid, citric acid
Explanation:
Fran finds a dark-colored rock that she identifies as basalt. Which property gives the rock its dark color?
O its shape
O its banding
its grain size
O its mineral content
Answer:
Mineral Content.
Explanation:
shape has nothing to do with the color displayed.
Nor does the grain size.
I don't know what banding is. Whatever it is, it is not the answer.
D: mineral content.
Most of the dissolved substance in sea water is: hydrogen chloride nitrogen sodium ANSWER NOW! I NEED HELP ASAP! WILL GIVE BRAINLIEST!
Answer: Sodium chloride
Explanation:
Ocean water contains a number of substances. When a substance which has ionic bonds is dissolved in water it takes the form of ions.
The most common ions in ocean water are sodium and chloride. These are the ions formed when common salt, sodium chloride (NaCl) is dissolved in water.
Sodium chloride accounts for about 3% of ocean water by mass.
Answer:
By far, the most abundant elements are hydrogen and water.
Explanation:
The analysis of the 77 sea water samples taken during the Challenger's 3-year voyage did much to lay the foundations for determining the chemical content of sea water. By far, the most abundant elements are hydrogen and water (combined to make water). Together, these elements make up 96% of sea water. Sodium chloride and magnesium make up just under 4% of sea water. Trace amounts of 97 other elements are found in the remaining 0.08%. Of the trace elements, calcium, potassium, sulfur, and bromine are the most abundant.
This is directly from the text.
Does the shape of molecule matter?
Choose all the answers that apply. Which of the following energy forms are involved in a nuclear power plant?
1)heat
2)mechanical
3)electrical
4)nuclear
Answer:Three mutual conversions of energy forms occur at nuclear power plants: nuclear energy is converted into thermal energy, thermal energy is converted into mechanical energy, and mechanical energy is converted into electric energy.
Explanation:
5. What could you do to convert from meters to centimeters? *
A. There is no standard way to convert these units.
B. Leave the decimal in the same position.
C. Move the decimal to the right.
D. Move the decimal to the left.
C.
centi- is essentially 10^2 of one meter.
If you had 100m, multiplying 100 by 10^2 (or 100) would give you 10000 cm.
Which compound forms a powerful acid and contains a halogen
Answer:
B I already know this
Explanation:
Convert 840 mL to liters ( be sure to keep the appropriate number of significant figures - also, only enter a number DO NOT INCLUDE UNITS)
A scientist is studying two types of worms. Worm X has DNA identical to its parent. Worm Y has a combination of DNA from two parents. The scientist determines that one of the worms has a survival advantage over the other worm. Which statement correctly summarizes this conclusion? Worm X reproduces asexually, which gives it genetic variation. Worm Y reproduces sexually, which gives it genetic variation. Worm Y reproduces asexually, which gives it more DNA. Worm X reproduces sexually, which gives it more DNA.
Answer:
2. Worm Y reproduces sexually, which gives it genetic variation.
Answer:
B Worm Y reproduces sexually, which gives it genetic variation.
Explanation:
hope you all have a good day
What term describes the ability of something to float on water
A) density
B) buoyancy
C) magnetism
D) solubility
Answer: (B) Buoyancy
Explanation: Buoyant force is an upward force that fluids exert on any object that is placed in them. The ability of fluids to exert this force is called buoyancy
Answer:
[tex]\boxed {\tt B. \ Buoyancy}[/tex]
Explanation:
Let's define each answer choice.
A. Density
The amount of mass in a certain spaceB. Buoyancy
The tendency of an object to float on a fluid/waterC. Magnetism
The ability of objects to product attracting or repulsing fieldsD. Solubility
The ability to dissolveThe definition that matches "the ability for something to float on water" is buoyancy. Therefore, the correct answer is B. Buoyancy
which is the part of an experiment that serves as the point of comparison for the results
Answer:
the observation point.
Explanation:
after the experiment, you observe the data and comparing and write out formulas for the given data.
Translate each number into standard notation
4.52 x 10 power3
Answer:
4.52×1000=4520
Explanation:
4.52*1000=4520
N2(g) + 2H(g) -> N2 H4(g) What are the volumes of N2 gas and H2 gas required to form 28.5 grams of N2 H4 at 30'C and 1.50 atm?
Answer:
Volume of N₂ = 14.76 L
Volume of H₂ = 29.52 L
Explanation:
Given data:
Mass of N₂H₄ formed = 28.5 g
Pressure = 1.50 atm
Temperature = 30°C (30+273 = 303 k)
Volume of N₂ and H₂ needed = ?
Solution:
Chemical equation:
N₂ + 2H₂ → N₂H₄
Number of moles of N₂H₄ formed = mass/ molar mass
Number of moles of N₂H₄ formed = 28.5 g/ 32 g/mol
Number of moles of N₂H₄ formed = 0.89 mol
Now we will compare the moles of N₂H₄ with N₂ and H₂ form balance chemical equation.
N₂H₄ : N₂
1 : 1
0.89 : 0.89
N₂H₄ : H₂
1 : 2
0.89 : 2×0.89 = 1.78 mol
Volume of H₂:
PV = nRT
1.50 atm × V = 1.78 mol × 0.0821 atm.L/mol.K × 303 K
V = 44.28atm.L /1.50 atm
V = 29.52 L
Volume of N₂:
PV = nRT
1.50 atm × V = 0.89 mol × 0.0821 atm.L/mol.K × 303 K
V = 22.14 atm.L /1.50 atm
V = 14.76 L
What is the volume mL of 2 degree celsius?
Answer:
Question not very specific, but here is an answer you might be looking for. Density of object at 2 degrees C, 0.99997 g/mL. Hope it IS the answer you are looking for!
Explanation:
The skeletal structure in line-angle (line-bond) mode of 2,3,3,5-tetramethylhexane is shown. Identify the number of hydrogen atoms bound to each carbon atom in the structure.
Answer:
There are 22 hydrogen in 2,3,3,5-tetramethylhexane (C10H22)
From the left to the right of the skeletal structure:
1st Main Carbon = 3 hydrogen
2nd Main Carbon = 1 hydrogen
1st Branch Carbon = 3 hydrogen
3rd Main Carbon = 2 hydrogen
2nd Branch Carbon = 3 hydrogen
3rd Branch Carbon = 3 hydrogen
4th Main Carbon = 0 hydrogen
4th Branch Carbon = 3 hydrogen
5th Main Carbon = 1 hydrogen
6th Main Carbon = 3 hydrogen
Total = 22 hydrogen
Explanation:
This is the skeletal formula for 2,3,3,5-tetramethylhexane - the 2D chemical structure. It is an organic compound. The carbon atoms in the structure are known as the carbon backbone. The hydrogen atoms are linked to the carbon backbone. This provides each carbon atom with four bonds.
Determine the volume of 200 g of hydrogen gas.
Why is Cobalt (Co) placed before Nickel (Ni) on the Periodic Table of the Elements even though it has a higher average atomic mass than nickel?
Nickel has fewer electrons.
Cobalt has a lower density.
Cobalt was discovered first.
Nickel has one more proton.
Answer: Nickel has one more proton.
Explanation:
The Periodic table orders elements based on their atomic number not by their atomic mass even though this order usually coincides with the atomic masses of the elements. Occasionally however, this is not the case as is proven by Cobalt and Nickel.
The atomic number of an element refers to the number of protons that the element has in its nucleus. Cobalt has 27 protons whilst Nickel has one more proton at 28 which is why it comes after Cobalt.
Answer:
lower density
Explanation:
Compounds have the same properties as the elements they are made up of. Is it true or false
Answer:
compounds have the same properties the elementary are false.
Atoms contain positively charged protons and negatively charged electrons. Why does an ordinary atom have no charge?
Atoms contain positively charged protons and negatively charged electrons. The atoms contain the same number of protons and electrons so the positively charged protons balance out the negatively charged electrons. Therefore, an atom is electrically neutral because it has no charge.
How many steps are there in the formation of a Solar System?
O Eight
O Four
O Ten
O Six
If ur a space nerd pls help
Answer:
6 steps
Explanation:
Answer:
6
Explanation:
I looked it up on Google. Hope this is right
write the molecular formula for the following compound.
Answer : The molecular formula of the compound is, [tex]C_8H_9O_3N[/tex]
Explanation :
Molecular formula : It is the representation of substance by the symbols and it denotes the number of atoms of each element present in the compound.
Now count the number of carbon, hydrogen, nitrogen and oxygen atoms present in the given compound.
As we see that in the given compound, there are 8 atoms of carbon element, 3 atoms of oxygen element, 1 atom of nitrogen element, 9 atoms of hydrogen element.
Thus, the molecular formula of the compound will be [tex]C_8H_9O_3N[/tex]
CALCULATE SCIENTIFIC NOTATION (Add and Subtract)
1) 9 × 103 + 2.3 × 104
2) 15 × 102 + 5.2 × 105
3) 10 × 104 + 2.8 × 106
4) 7.0 × 103 + 8.6 × 104
5) 3.0 × 104 + 14.5 × 105
6) 8 x 104 – 2.7 x 102
7) 5.0 x 103 – 8.9 x 104
8) 7.0 x 103 – 8.20 x 102
Answer:
1. 1166.2
2. 2076
3. 1336. 8
4. 733.04
5. 1834.5
6. 556.6
7. - 410.6
8. 836.4
Explanation:
1.9 x 103 =928
For a reaction Y → X with a very high equilibrium constant, K, which of the following is true? You can refer to the following two equations in formulating your answer.$$$$Choose one:A. The standard free-energy change is large and positive.B. The amount of product and substrate are equal at equilibrium.C. The forward reaction rate greatly exceeds the reverse reaction rate at equilibrium.D. The amount of product will be higher than the amount of substrate at equilibrium.
Answer:The amount of product will be higher than the amount of substrate at equilibrium
Explanation:
Recall that the equilibrium constant K depends on the amounts of reactants and products present in the system at equilibrium.
Considering the equation; K = [X]/[Y], as the concentration of X increases above that of Y, the equilibrium constant K becomes very high, hence the answer above.
What happens when the compound NaCI is formed
Answer:
A. Sodium transfers an electron to chlorine. Sodium forms an ion with −1 charge and chlorine forms an ion with +1 charge
Explanation:
How many moles of sodium sulfate are present in .100 g of the compound?
2.126 x 10^-3 mol
174.3 mol
7.040 x 10^-4 mol
Answer:
7.040 x 10^-4 mol
Explanation:
Where can you find most of Earth's liquid freshwater?
Answer:
Where can you find most of Earth's liquid freshwater?
Explanation:
Over 68 percent of the fresh water on Earth is found in icecaps and glaciers, and just over 30 percent is found in ground water. Only about 0.3 percent of our fresh water is found in the surface water of lakes, rivers, and swamps.
Hope that helped, i also have snap if you need me.
Over 68 per cent of the fresh water on Earth is found in icecaps and glaciers, and just over 30 per cent is found in groundwater. Only about 0.3 per cent of our freshwater is found in the surface water of lakes, and rivers.
What is the per cent of the water on this earth?The Earth is a watery place. About 71 per cent of the Earth's surface is water-covered, and the oceans hold about 96.5 per cent of all Earth's water.
The majority of Earth’s fresh water is stored in underground aquifers.
Aquifers are layers of sedimentary formations such as sandstone and fractured hard rocks where water after infiltration from soil reaches and fill the interstitial spaces.
Aquifers are huge in size in basins and contain a huge amount of underground water of fresh quality.
So, over 68 per cent of the freshwater is present on Earth.
Learn more about the freshwater here:
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PLZ HELP I'LL AWARD BRAINLIEST
What is the name of the molecular geometry (shape) for this Lewis structure? Immersive Reader.
(A) bent
(B) Trigonal planar
(C) Trigonal pyramidal
(D) Tetrahedral
Answer:
B. Trigonal planar
Explanation:
hope this helps. brainliest please?
which of the following is NOT a characteristic of minerals
A. Occur in gaseous and liquid state
B. Formed by inorganic processes
C. naturally occurring
D. definite chemical composition
Answer:
A. Occur in gaseous and liquid state
Explanation:
The choice that is not a characteristic of minerals is that minerals occur in gaseous and liquid state.
All minerals are solid inorganic compounds.
A mineral is an inorganic compound that is formed naturally. They have a definite and specific chemical composition. Minerals are the building blocks of rocks. When minerals aggregates together, they form different rock types. There is no known mineral that is in fluid state. All minerals are solids. Examples are quartz, kaolinite, gypsum e.t.chow can i separate water salt starch
Answer:
By Boiling Them soo water can evaporate and separates from salt.
Which unit of measurement should you use when measuring the length of an earthworm?
Answer:
kilometers.........
