Answer:energy
Explanation:needed points sorry
What is the most abundant element on Earth?
A oxygen
B Cobalt
C Carbon
D Iron
5
Any substance represented by a chemical formula
A Homogenous mixture
B Heterogenous Mixture
C elements
D pure substance
Answer:
oxygen is the most abundant element on the earth.
A 32.65 g metal is placed in a flask. Liquid toluene is added to the flask so that the total volume of the metal and liquid toluene together is 50.00 mL. The metal and toluene together weigh 58.58 g. The density of toluene at the temperature of the experiment is 0.8640 g/mL. What is the density of the metal?
PLS HELP ME FOR BOTH QUESTIONS
Answer:
IF the match is stuck on the side it could chach burning hot.
2) the burn peices looks like its burned and it becomes black since of it.
Explanation:
Which of the following is the best definition of a chemical change?
A. A change in a substance where no new substance forms
B. A change in a substance where energy is conserved
C. A change in a substance where a phase change occurs
D. A change in a substance where one or more new substances form
Answer:it's D
Explanation:
A chemical change, unlike a physical change, is the formation of new products or one or more new substances formed from the reactants. Thus, option D is correct.
What is a chemical change?A chemical change is a type of change where the reactants break or combine to form a new product that is different from the reactants. Unlike physical change, they are not reversible and can be seen in combustion, neutralization, decomposition, redox reactions, etc.
It is a change in a matter where the reactant undergoes breaking or forming of the bonds to yield a new product. It is accompanied by changes in temperature, color, precipitation, and odor.
Therefore, a chemical change results in the formation of a new substance.
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A strong electrolyte is one that ________ completely in solution. a) reacts.b) decomposes.c) disappears.d) ionizes.
Answer:
A.
Explanation:
elctrolytes decomposes
Answer:
D. ionizes
Explanation:
Which statement is not true for a magnetic field?
O A. A magnetic field occurs near a wire that has no current.
OB. A magnetic field is produced by a magnet with two poles.
O c. A magnetic field loops from the north pole to the south pole.
O D. A magnetic field occurs near a current-carrying wire.
Answer:
The answer is letter A.
A. A magnetic field occurs near a wire that has no current.
Because magnetic field occur near a current carrying wire.
Most of the mass in an atom is found in the...?
An atom of an element contains 20 protons, 20 neutrons, and 20 electrons. This element is in Group *
Answer:
it is calcium. it is in group(llA).
Answer:
calcium it lies in group(IIA)hope it is helpful to you
In a vacuum, if a 0.045 kg golf ball is accelerated upward at 2.5 m/s2 by a hair dryer, how much force is required to accelerate the ball?
Answer:
F = 0.553 N
Explanation:
Given that,
Mass of a golf ball, m = 0.045 kg
Acceleration in upward direction, a = 2.5 m/s²
We need to find the force is required to accelerate the ball. Let the force be F. Using the second law of motion as follows :
F = m(a+g)
So,
F = 0.045 (2.5+9.8)
F = 0.553 N
So, the force required to accelerate the ball is 0.553 N.
For the reaction of nitric oxide and oxygen to form nitrogen dioxide, the reaction begins with 12.0 g of nitric oxide and 12.0 g of oxygen at 25oC in a 10.0 L container. At equilibrium, the pressure in the container is 1148 mmHg, what is Kp?
Answer:
Explanation:
Hello!
In this case, since the undergoing chemical reaction is:
[tex]2NO+O_2\rightleftharpoons 2NO_2[/tex]
The equilibrium expression in terms of pressures is:
[tex]Kp=\frac{p_{NO_2}^2}{p_{NO}^2p_{O_2}}[/tex]
Thus, for the initial conditions, we compute the initial pressures of both nitric oxide and oxygen:
[tex]p_{NO}^{0}=\frac{12.0g*0.082\frac{atm*L}{mol*K}*298.15K}{30g/mol*10.0L}=0.978atm\\\\ p_{O_2}^{0}=\frac{12.0g*0.082\frac{atm*L}{mol*K}*298.15K}{32g/mol*10.0L}=0.917atm[/tex]
Next, since the equilibrium pressure is 1148 mmHg or 1.51 atm, we can write:
[tex]p_T=p_{NO_2}+p_{NO}+p_{O_2}\\\\1.51=2x+0.978-2x+0.917-x\\\\1.51=1.90-x\\\\x=0.39atm[/tex]
Thus, the Kp turns out:
[tex]Kp=\frac{(2*0.39)^2}{(0.978-2*0.39)^2(0.917-x)} \\\\Kp=29.4[/tex]
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plz answer plzplzpzlpl
Which letter indicates the asthenosphere
Answer:
q
Explanation:
Choose the most correct statement from the options below. Be sure to consult the
periodic table.
Magnesium (Mg) and chlorine (Cl) are in the same GROUP and, so, share
SIMILAR physical and chemical properties.
Magnesium (Mg) and chlorine (CI) are in the same PERIOD and, so, share
SIMILAR physical and chemical properties.
Magnesium (Mg) and chlorine (CI) are in the same PERIOD and, so, will have
very DIFFERENT physical and chemical properties.
Magnesium (Mg) and chlorine (CI) are in the same GROUP and, so, share
DIFFERENT physical and chemical properties.
Answer: B
Explanation:
Mg and Cl are in the same row aka period. Elements in the same period have similar properties like electron shells so the second option is the best answer
A gram of gasoline produces 45 kJ of energy when burned. Gasoline has a density of 0.77 g/mL. How would you calculate the amount of energy produced by burning 48 L of gasoline?
The energy produced in the burning of gasoline = 45 kJ/g. So, amount of energy produced by burning 48 L gasoline = 45 kJ/g×36960 g = 1663200 kJ.
1. The state of Georgia has seen their water table become lower. What does this mean?
The amount of groundwater is increasing.
Their groundwater is being recharged by rain.
The amount of groundwater is decreasing.
Their groundwater is flowing to confined aquifers.
Answer:
The amount of groundwater is decreasing.
Explanation:
In an ecosystem like the state of Georgia where the water table has become lower it means that the amount of groundwater in the ecosystem is decreasing.
What is an ecosystem?Ecosystem is defined as a system which consists of all living organisms and the physical components with which the living beings interact. The abiotic and biotic components are linked to each other through nutrient cycles and flow of energy.
Energy enters the system through the process of photosynthesis .Animals play an important role in transfer of energy as they feed on each other.As a result of this transfer of matter and energy takes place through the system .Living organisms also influence the quantity of biomass present.By decomposition of dead plants and animals by microbes nutrients are released back in to the soil.
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Las Vegas, Nevada is in a desert. How does its rapid population growth affect the
water supply? Name at least two specific ways that human activities affect the quality
of groundwater
Answer:
Many areas of the United States experience explosive population growth. The more people that reside someplace, the more demand there is for water there. Often these urban-growth expansions are unplanned and place extraordinary stress on the water supply system, mainly on the groundwater. The stress often depletes groundwater supply, thereby causing wells to dry up. Then water must be brought from somewhere else to support the local population.
Such situations have occurred all over the United States. For example, increased population growth in the southwestern United States has significantly lowered the water table 50 to 200 feet (depending on the area) since the 1940s. Managing urban growth, efforts to reduce water demand, conservation of the resource, and attempts to increase the water supply all address the problem of exceeding water resource limits.
Human activities affect groundwater quality.
Here are some sources and possible solutions to groundwater pollution:
Agriculture—Reduce usage of pesticides and fertilizers.
Landfills—Monitor for leakage and repair linings.
Underground storage tanks—Remove damaged and unused tanks.
Household wastes—Properly dispose of household hazardous waste.
Septic tank leaks—Properly maintain and repair tanks.
Explanation:
This came from the K12 learning course read this and the answer will be there. I underlined the important parts for the answer.
What is the energy of a wave if the frequency is 300. Hz
Answer:
[tex]E=1.98\times 10^{-31}\ J[/tex]
Explanation:
Given that,
The frequency of a wave, f = 300 Hz
We need to find the energy of a wave. The formula for the energy of a wave is given by :
E = hf,
Where h is Planck's constant
[tex]E=6.63\times 10^{-34}\times 300\\\\=1.98\times 10^{-31}\ J[/tex]
So, the energy of the wave is [tex]1.98\times 10^{-31}\ J[/tex].
A student is using colored beads to model 1 molecule of LaTeX: Ca_3\left(PO_4\right)_2C a 3 ( P O 4 ) 2. The student uses blue beads to model Calcium, red beads to model Phosporus, and green beads to model Oxygen. How many of each color will the student need to make their model?
Answer:
3 blue beads
1 red beads
4 green beads
Explanation:
The compound given:
Ca₃PO₄
Elements in the compound are:
Ca
P
O
Number of atoms are :
Ca - 3
P - 1
O - 4
blue beads to model Calcium
red beads to model Phosphorus
green beads to model Oxygen
3 blue beads
1 red beads
4 green beads
1. What is the molar mass of Al?
Answer:
26.981539 u
Explanation:
The energy of a pendulum is recorded at different positions in the table below. Use the data in the table to determine the amount of kinetic energy the pendulum had at Position 2. Record your answer below.
Please help me I just want to get this test over with
Answer:
so i got 34.5
Explanation:
Molarity to percent by mass. Convert 1.672 mol/L MgCl2(aq) solution to percent by mass of MgCl2 in the solution. The solution density at this concentration is 1.137 g/mL. Answer to 4 significant figures with appropriate units.
Answer:
[tex]\%m/m=14\%[/tex]
Explanation:
Hello!
In this case, since the molarity of magnesium chloride (molar mass = 95.211 g/mol) is 1.672 mol/L and we know the density of the solution, we can first compute the concentration in g/L as shown below:
[tex][MgCl_2]=1.672\frac{molMgCl_2}{L}*\frac{95.211gMgCl_2}{1molMgCl_2}=159.2\frac{gMgCl_2}{L}[/tex]
Next, since the density of the solution is 1.137 g/mL, we can compute the concentration in g/g as shown below:
[tex][MgCl_2]=159.2\frac{gMgCl_2}{L}*\frac{1L}{1000mL}*\frac{1mL}{1.137g}=0.14[/tex]
Which is also the by-mass fraction and in percent it turns out:
[tex]\%m/m=0.14*100\%\\\\\%m/m=14\%[/tex]
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what step of the scientific method do we decide whether our hypothesis was correct or not
Maybe someone knows how to name compounds by IUPAC ?
Explanation:
The IUPAC system of nomenclature aims to ensure
that every organic compound has a unique, unambiguous name.that the IUPAC name of any compound conveys the structure of that compound to a person familiar with the system.
One way of checking whether the name you have given to an alkane is reasonable is to count the number of carbon atoms implied by the chosen name. For example, if you named a compound 3‑ethyl-4‑methylheptane, you have indicated that the compound contains a total of 10 carbon atoms—seven carbon atoms in the main chain, two carbon atoms in an ethyl group, and one carbon atom in a methyl group. If you were to check the given structure and find 11 carbon atoms, you would know that you had made a mistake. Perhaps the name you should have written was 3‑ethyl-4,4‑dimethylheptane!
How many moles are in a balloon that is 50.2L, 755 mmHg and -22.0C?
Answer:
n ≈ 2.42 moles
General Formulas and Concepts:
Chem
Ideal Gas Law: PV = nRT
P is pressure in mmHgV is volume in litersn is number of molesR is a constant (62.4 L · mmHg/mol · k)T is temperature in KelvinsK = °C + 273
Explanation:
Step 1: Define
V = 50.2 L
P = 755 mmHg
T = -22.0°C = 251 K
Step 2: Find moles n
(755 mmHg)(50.2 L) = n(62.4 L · mmHg/mol · k)(251 K)
37901 mmHg · L = n(15662.4 L · mmHg/mol)
n = 2.41987 moles
Step 3: Check
We are given 3 sig figs. Follow sig fig rules.
2.41987 moles ≈ 2.42 moles
A ball was massed in a dish. The total mass was 15.6 grams. Treball was placed in a
cylinder containing 26.7 ml of water. The new water level was 38.9 ml. If the mass of the dish is 1.03 grams, what is the mass of the ball?
Answer:
14.57g
Explanation:
Given parameters:
Mass of dish + ball = 15.6g
Initial volume of water in the cylinder = 26.7mL
Final volume of water in the cylinder = 38.9mL
Mass of dish = ?
Unknown
Mass of the ball = ?
Solution;
Since the mass of ball and dish is 15.6g,
Mass of the ball =Mass of ball + dish - mass of the dish
Insert the parameters and solve;
Mass of the ball = 15.6g - 1.03g = 14.57g
Which two types of energy are formed by the transformation shown in the
photo?
A. Chemical energy
thermal energy
B. Thermal energy -
electrical energy
C. Thermal energy -
chemical energy
D. Chemical energy
-
electromagnetic energy
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Explanation:
i cant even see any thing
Answer: A and D
Explanation:
How does one determine a percent composition from an empirical
formula?
A. Divide the atomic mass of the element by its subscript and
multiply by 100%
O B. Divide the mass of the compound by the atomic mass of
the element and multiply by 100%
O C. Divide the subscript of the element by the mass of the
element and multiply by 100%
O D. Divide the total mass of each element by the mass of the
compound and multiply by 100%
The way one determines a percent composition from an empirical formula is to divide the total mass of each element by the mass of the compound and multiply by 100%.
What is empirical formula?Empirical formula is a notation that indicates the ratios of the various elements present in a compound, without regard to the actual numbers.
The empirical formula of a compound is the simplest ratio that can exist between the constituent elements of a compound.
However, the percent composition of a compound can be determined by dividing the total mass of each element by the mass of the compound and multiply by 100%.
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Describe the process of photosynthesis (including what components get released). ASAP
Answer: It is convenient to divide the photosynthetic process in plants into four stages, each occurring in a defined area of the chloroplast: (1) absorption of light, (2) electron transport leading to the reduction of NADP+ to NADPH, (3) generation of ATP, and (4) conversion of CO2 into carbohydrates (carbon fixation). All four stages of photosynthesis are tightly coupled and controlled so as to produce the amount of carbohydrate required by the plant. All the reactions in stages 1 – 3 are catalyzed by proteins in the thylakoid membrane. The enzymes that incorporate CO2 into chemical intermediates and then convert it to starch are soluble constituents of the chloroplast stroma (see Figure 16-34). The enzymes that form sucrose from three-carbon intermediates are in the cytosol.
Answer:
Glucose gets made using Carbon dioxide, water, and sunlight. Glucose serves as food for the plant. This was the answer to your question
Explanation:
what is molecular weight of ash?
Answer:
AsH(2.) CHEBI:33104
Explanation:
Molecular Weight is : 75.9296 g/mol
what is the mass of silver that has a volume of 238mL? the density of silver is 10.5 g/cm^2
Explanation:
What volume of silver metal will weigh exactly 2500.0 g. The density of silver is 10.5 g/cm3. cm3 = 2500.0 g / 10.5 g/cm3 = 238 cm3
What is the density of a piece of wood that has a mass of 25.0 grams and a volume of 29.4 cm3? d = .85 g/cm3