Answer:
First column
Explanation:
In most cases, the independent variable (that which you purposefully change) is in the left column, the dependent variable (that which you measure) with the different trials is in the next columns, and the derived or calculated column (often average) is on the far right.
calculate the pH of the following
A.0.02mol/L HCI
B. 0.1 mol/L NaOH
Answer:
A.
Explanation:
hope it helps
Drag electrons back and forth until the molecule of oxygen (O2) is stable. Click Check to confirm your molecule is stable. How many pairs of shared electrons are there in a stable molecule of oxygen?
Answer:
2 pairs (4 electrons)
Explanation:
In a molecule of oxygen there are 2 oxygen atoms. There are 6 electrons in the outer shells of oxygen atoms. When 2 oxygen atoms form a covalent bond they share their electrons. In a diagram this would be represented by the overlap of the two circles representing the outer shells of both oxygen atoms. If each oxygen atom 'puts forward' 2 electrons into the centre, then 4 will be shared overall for each atom, making both atoms have full outer shells of 8 electrons each. 4 electrons make 2 pairs, hence the answer.
A scientist observed the number of deer that came to drink at a local pond on five different days. The table above shows the data that she collected on those days.
Which of the following is supported by evidence seen in the data?
A.
The most important observations were made on May 1.
B.
More deer came to drink on days that were warmer.
C.
Observations from summer and fall months would have been more useful.
D.
More deer came to drink on days that were cooler.
Answer:
B.
More deer came to drink on days that were warmer.
characteristic of compounds
Answer:
Characteristics of a compound
The properties of a compound are different from the properties of its constituents. Formation of a compound is generally accompanied by evolution of energy in the form of heat or light. A compound has a fixed melting point and boiling point. A compound is always homogeneous in nature.
MARKING BRAINLIEST!
Which factor most directly affects potential energy but not kinetic energy?
Mass
Density
Velocity
Elasticity
Answer:
Velocity is the answer I hope it helps
Explanation:
Answer:
velocity
Explanation:
is mixing acid and base a chemical change or a physical change
Answer : chemical reaction
Mixing an acid with a base is a common chemical reaction.
Answer:
It is a chemical reaction.
Explanation:
Mixing acid and base is a common chemical reaction.
(I had my answer in the comments bc at the time I couldn't submit it as a answer so here ya go)
Hope this helps! :)
An unknown compound has the following chemical formula: NO_x
where x stands for a whole number.
Measurements also show that a certain sample of the unknown compound contains of oxygen and of nitrogen.
Write the complete chemical formula for the unknown compound.
Answer:
NO_x
Explanation:
you said it
The periodic table of elements is composed of many
Answer:
The periodic table is composed of many elements.
Explanation:
1. it's in the name.
2. if you search up what is the periodic table made of (Not that I did) it will say elements.
Brainliest if you liked the answer please.
the HCO3 -1 ion is called
Answer:
Isn't that the bicarbonate Ion?
Scientists believe the Earth's inner core to be solid. This is probably due to extremes in:
pressure
depth
density
temperature
Previous
Hybridization
of Bromine in BrF5
Answer:
the hybridization of bromine in BrF5 is SP³d².
Explanation:
Because its forms five single bond &have one lone pair that consider as sigma. So total sigma bond is 6. Hence hybridisation is SP³d².
Based on the activity series you created in part C, predict whether there would be a chemical
reaction or no reaction when the listed pairs of substances are combined.
BI U X
X Х.
Font Sizes
А -
А
EEE 를 들 들
Substances
Reaction or No
Reaction
I
magnesium and copper(1)
sulfate
iron and magnesium sulfate
copper and iron(III) nitrate
magnesium and hydrochloric
acid
Answer:
first one is no reaction and the rest are reaction
Explanation:
How long does it take for a car driving at 10m/s to move 200m?
A.
0.05 seconds
B.
2 seconds
C.
20 seconds
D.
2000 seconds
The time taken by the car driving at 10m/s to move 200m is 20 seconds. The speed of car is 10m/s. Thus option C is correct.
What is speed?Speed is defined as a measurement of the length of time it takes for an object to travel a certain distance.
The SI unit of speed is m/s, and speed is defined as the ratio of distance to time.
A change in speed is an example of acceleration because it is a change in velocity. Acceleration could be for positive or negative. Deceleration is another name for negative acceleration.
There are four types of speed.
Uniform speedVariable speedAverage speedInstantaneous speedSpeed can be expressed as
Speed = Distance / Time
Given, Distance = 200 m
Time = 10 m/s
Speed = 200m / 10m/s
= 20 seconds
Thus, the time taken by the car driving at 10m/s to move 200m is 20 seconds. The speed of car is 10m/s. Thus option C is correct.
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3. What is the picture displayed? *
1 point
a.atom
b.molecule
c.element
d.compound
molecule (hope this helps :))
Convert 1.2 Mg into milligrams
Answer:
1200 milligrams
An environmental chemist analyzed the effluent (the released waste material) from an industrial process known to produce the compounds carbon tetrachloride (CC14) and benzoic acid (HC7H5O2), a weak acid that has one acidic hydrogen atom per molecule. A sample of this effluent weighing 0.3518 g was shaken with water, and the resulting aqueous solution required 10.59 mL of 0.1546 M NaOH for neutralization. Calculate the mass percent of HC7H5O2 in the original sample.
The mass percent of benzoic acid in the sample is 55.5%.
The equation of the reaction is; HC7H5O2(aq) + NaOH(aq) ----> NaC7H5O2(aq) + H2O(l)
Number of moles of NaOH reacted = concentration × volume
Number of moles of NaOH reacted = 10.59/1000 L × 0.1546 M
Number of moles of NaOH reacted = 0.0016 moles of NaOH
Since the reaction is 1:1, 0.0016 moles of HC7H5O2 reacted also.
Hence, mass of HC7H5O2 = 0.0016 moles × 122 g/mol = 0.1952 g
Mass percent of HC7H5O2 in the original sample = 0.1952 g/ 0.3518 g × 100 = 55.5%
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1. Rank each of the following in order of INCREASING atomic radius
a F, K, Br
b. Mg. Na, Cs
c. Os, Ni, Fe
2. Rank each of the following in order of DECREASING atomic radius
A. CI, Br, Ga
B. Ne, Rn, Pb
C. Ca, Rb, C
Which stament describes a Newton
Answer:
It reflects the amount of force an object exerts. It states that every object attracts another object.
The elements in group 10, period five. Equals what on the periodic table.
Answer:
Palladium
Explanation:
If a raptor's wingspan were 112 centimeters, how long
would its body have to be for it to have a body-to-
wingspan ratio of 0.45?
Answer:
162.4 cm
Explanation:
please give brainliest award
Which is a strong base?
A. HCl
B. NaOH
C. NH3
D. H3CO3
Answer:
c
Explanation:
Answer:
B
Explanation:
You have 150.0 mL of a 0.415 M solution of Ce(NO₃)₄.
a) What mass (in grams) of Ce(NO₃)₄ would be required to make the solution?
B) What is the concentration of the nitrate ions in the solution ?
C) If the original solution was diluted to 350.0 mL, what would be the new concentration of the Ce(NO₃)₄ in the solution?
A. The mass (in grams) of Ce(NO₃)₄ that will be required to make the solution is 24.16 g
B. The concentration of the nitrate ions in the solution is 1.66 M
C. The new concentration of the Ce(NO₃)₄ solution is 0.178 M
We'll begin by calculating the number of mole of Ce(NO₃)₄ in the solution.
Molarity = 0.415 M
Volume = 150 mL = 150 /1000 = 0.15 L
Mole of Ce(NO₃)₄ =?Mole = Molarity × Volume
Mole of Ce(NO₃)₄ = 0.415 × 0.15
Mole of Ce(NO₃)₄ = 0.06225 moleA. Determination of the mass of Ce(NO₃)₄ required to make the solution.
Mole of Ce(NO₃)₄ = 0.06225 mole
Molar of Ce(NO₃)₄ = 140.12 + 4[14 + (16×3)]
= 140.12 + 4[14 + 48]
= 140.12 + 4[62]
= 140.12 + 248
= 388.12 g/mol
Mass of Ce(NO₃)₄ =?Mass = mole × molar mass
Mass of Ce(NO₃)₄ = 0.06225 × 388.12
Mass of Ce(NO₃)₄ = 24.16 gTherefore, 24.16 g of Ce(NO₃)₄ is required to make the solution.
B. Determination of the concentration of the nitrate ion, NO₃¯ in the solution.
In solution, Ce(NO₃)₄ will dissociate as follow:
Ce(NO₃)₄ (aq) —> Ce⁴⁺(aq) + 4NO₃¯(aq)
From the balanced equation above,
1 mole of Ce(NO₃)₄ contains 4 moles of NO₃¯
Therefore,
0.415 M solution of Ce(NO₃)₄ will contain = 0.415 × 4 = 1.66 M NO₃¯
Thus, 1.66 M of the nitrate ion, NO₃¯, is present in the solution.
C. Determination of the new concentration of the Ce(NO₃)₄ solution.
Volume of stock solution (V₁) = 150 mL
Molarity of stock solution (M₁) = 0.415 M
Volume of diluted solution (V₂) = 350 mL
Molarity of diluted solution (M₂) =?
M₁V₁ = M₂V₂0.415 × 150 = M₂ × 350
62.25 = M₂ × 350
Divide both side by 350
M₂ = 62.25 / 350
M₂ = 0.178 MTherefore, the new concentration of the Ce(NO₃)₄ solution is 0.178 M
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Light-DEPENDENT reactions do NOT involve which of the following?
A. sunlight
B. chlorophyll
C. water
D. carbon dioxide
Answer:
The answer to your question is D. carbon dioxide
Explanation:
Light-DEPENDENT → The light-dependent reactions convert light energy into chemical energy.
_________ is when humans choose the traits of an organism.
Your answer should be -selective breeding
[tex]hope that helps[/tex]
Question 1 of 5
A specific nitrogen atom has 7 protons and 6 neutrons. If this is a neutral
atom, how many electrons does the atom have?
A. 7
B. 13
C. 14
D. 6
SUBMI
Answer:
A.7
Explanation:
because proton equals to electron in neutral
help me please :(
D & 1 is also a option
Which statement is an example of a scientific hypothesis?
A.
What type of fertilizer is best for growing beans?
B.
Only half of the bean plants grew over six inches.
C.
How long is the life cycle of a bean plant?
D.
Bean plants will grow best in well-drained soil.
Answer:
D
Explanation:
Let us assume that Cr(OH)3 (s) is completely insoluble, which signifies that the precipitation reaction with NaOH(aq) (presented in the transition) would go to completion Cr3+ (aq) + 3NaOH(aq) + Cu(OH)3 (s) + 3Na+ (aq) If you had a 0.150 L solution containing 0.0280 M of Cr3' (aq), and you wished to add enough 1.31 M NaOH(aq) to precipitate all of the metal, what is the minimum amount of the NaOH(aq) solution you would need to add? Assume that the NaOH(aq) solution is the only source of OH(aq) for the precipitation Express the volume to three significant figures and include the appropriate units.
Answer:
Formation of an insoluble compound will sometimes occur when a solution containing a particular cation (a positively charged ion) is mixed with another solution containing a particular anion (a negatively charged ion). The solid that separates is called a precipitate.
Explanation:
The relationships among which variable quantities are expressed by the ideal gas law equation?
A. pressure, volume, temperature, number of moles
B. volume, temperature, number of moles, gas constant
C. pressure, volume, number of moles, mass
D. pressure, volume, temperature, molar mass
Answer:
A. Pressure, volume, temperature, number of moles
The relationships among pressure, volume, temperature, and the number of moles are expressed by the ideal gas law equation. Therefore, option A is the correct answer.
The ideal gas law equation is PV = nRT, where P represents the pressure of the gas, V represents its volume, n represents the number of moles of gas present, T represents its temperature, and R is the ideal gas constant. This equation describes the behavior of an ideal gas at standard temperature and pressure (STP).
By manipulating the ideal gas law equation, we can calculate various properties of gases, including their density, molar mass, and molecular weight. This equation is widely used in chemical engineering, thermodynamics, and other fields that deal with gases.
Thus, option A is correct.
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What is the mass number for an atom of xenon containing 54 protons and 75 neutrons?
Answer:
Answer should 133
Explanation:
all you have to do is add the protons and neutrons
The mass number for an atom of xenon containing 54 protons and 75 neutrons is 129 amu.
What is an Atomic mass of an atom?The Atomic mass of any atom may be defined as the mass of an atom that is togetherly constituted by protons and neurons in the nucleus of an atom. It is approximately equivalent to the number of protons and neutrons in the atom (the mass number).
The mass number of Xenon is calculated by the following formula:
The Number of neutrons = Mass number - Atomic number.
where, number of neutrons = 75, and number of protons = 54.
75 = Mass number - 54 (number of protons = atomic number).
Mass number = 75 + 54 = 129 amu.
Therefore, the mass number for an atom of xenon containing 54 protons and 75 neutrons is 129 amu.
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