What are the solutions to the equation x2 + 4x + 5 = 0?
Answer:
-1, -4
Explanation:
[tex]x^2+4x+5=0[/tex]
Factoring, you get:
[tex](x+4)(x+1)=0[/tex]
To find what x can be, you need to realize what could make this equation true. To set the left side equal to 0, either one of the terms in parentheses must be equal to 0. To do that, x must be the negative of the other term, so that they can cancel each other out. Therefore, x is -4 and -1. Hope this helps!
Answer:
-1,-4
Explanation:
Which bug populations did survive during the air pollution?
Answer:
ants and flys
Explanation:
Balance the half-reaction in acidic or basic solution then state whether the process is oxidation or reduction. b) CLO4^-1 —> Cl2 c) FeO —> Fe2O3 d)NO3^-1 —> N2O4
Answer:
c
Explanation:
took it
If a scientist is testing the effect of fertilizer on plant growth, which of the following factors would NOT be kept constant?
Answer:
soil is fertile this is reason that scientists would not be kept constant
Answer:
Fertilizer
Explanation:
Constants are the parts in a experiment that are kept the same throughout the experiment. Some examples for this experiment could be growing environment, temperature, humidity, amount of water given each day, and the time in the sun.
In this experiment, the scientist is testing the effect of fertilizer on plant growth. Therefore, if the scientist wants to truly test the effect of fertilizer, they would not be able to keep the fertilizer constant. If it was kept constant, there wouldn't be any experiment, because we would use the same amount or type of fertilizer in every trial.
Therefore, the factor that would not be kept constant would be the fertilizer.
How can local environmental changes have global effects?
a. Organisms can move from one environment to another.
b. Air and water move from region to region.
C. Increased carbon dioxide in one location can cause increased temperatures in other locations
d. All of the above are true.
Please select the best answer from the choices provided
OA
B
O O O O
Answer:
D got it right on edge 2020
Explanation:
TIMED PLEASE HELP! Which is shown by the letter X?
trough
amplitude
crest
wavelength
Answer: crest
Explanation:
X is pointing to the peak of the wave. Hence, the answer is the third option: crest.
Answer:
The answer is crest
Explanation:
The highest surface part of a wave is called the crest
how many protons, electrons, and neutrons are in 82 Se 34
What does thermal energy measure?
Hey!!
Here's your answer
Thermal energy is the energy that is generated or measured by heat.
Thermal energy measures the movement of atoms or molecules within a substance.
Hope it helps
If there is enough energy and H2, then how many moles of Sn02 will react with 2 moles of H2 and produce 1 mole of Sn and 2 moles of H2O? How many moles of SnO2 does this balanced equation represent?
Answer:
One mole of SnO2
Explanation:
SnO2(s) + 2H2(g) ------> Sn(s) + 2H2O(l)
In every question that has to do with stoichiometry, the balanced reaction equation is the first step towards obtaining the correct answer because it serves as a guide in solving the question.
From the balanced reaction equation, we have
1 mole of SnO2 reacts with 2 moles of hydrogen gas to yield two moles of water.
The balanced reaction equation represents one mole of SnO2.
Hence the answer.
A gas of 250 ml at 20°C and 720 Torrs. What volume would the gas occupy at STP ?
Answer: The gas would occupy volume of 221 ml at STP
Explanation:
Combined gas law is the combination of Boyle's law, Charles's law and Gay-Lussac's law.
The combined gas equation is,
[tex]\frac{P_1V_1}{T_1}=\frac{P_2V_2}{T_2}[/tex]
where,
[tex]P_1[/tex] = initial pressure of gas = 720 torr
[tex]P_2[/tex] = final pressure of gas = 760 torr (at STP)
[tex]V_1[/tex] = initial volume of gas = 250 ml
[tex]V_2[/tex] = final volume of gas = ?
[tex]T_1[/tex] = initial temperature of gas = [tex]20^oC=273+20=293K[/tex]
[tex]T_2[/tex] = final temperature of gas = [tex]273K[/tex] (at STP)
Now put all the given values in the above equation, we get:
[tex]\frac{720\times 250}{293}=\frac{760\times V_2}{273}[/tex]
[tex]V_2=221ml[/tex]
The gas would occupy volume of 221 ml at STP
Is boiling water a physical change
Answer:
yes ,it is a physical change
Explanation:
because physical change can be reversed which means that boiling water can be reversed back
what is the molarity of a solution that contains 14.92 grams magnesium oxide (MgO) in 365ml of solution?
a. 1.01 molar solution
b. 1.52 molar solution
c. 11.2 molar solution
d. 87.2 molar solution
Answer:
a. 1.01 molar solution
Explanation:
Now we have to recall the formula;
n= CV
Where
n= number of moles of magnesium oxide
C= concentration of magnesium oxide solution = ???
V= volume of magnesium oxide solution= 365 ml
But;
n= m/M
Where;
m= given mass of magnesium oxide= 14.2 g
M= molar mass of magnesium oxide= 40.3044 g/mol
Substituting values;
14.2g/40.3044 g/mol = C×365/1000
0.3523= 0.365 C
C= 0.3523/0.365
C= 0.965
C= 1.00 molar (approx)
Answer:
Option A. 1.01 molar solution
Explanation:
Step 1:
Data obtained from the question. This include the following:
Mass of MgO = 14.92g
Volume of solution = 365mL
Molarity of solution =.?
Step 2:
Determination of the number of mole present in 14.92g of MgO.
This is illustrated below:
Mass of MgO = 14.92g
Molar mass of MgO = 24.3 + 16 = 40.3g/mol
Number of mole MgO =...?
Mole = Mass /Molar Mass
Number of mole of MgO = 14.92/40.3 = 0.370 mole
Step 3:
Determination of the molarity of the solution.
This can be obtained as follow:
Mole of MgO = 0.370 mole
Volume = 365mL = 365/1000 = 0.365L
Molarity =..?
Molarity = mole /Volume
Molarity = 0.370/0.365
Molarity = 1.01M
What do these two changes have in common?
sediment settling to the bottom of a muddy puddle
a puddle freezing into ice on a cold night
Select all that apply.
Both are chemical changes.
Both are changes of state.
Both are caused by heating.
Both are only physical changes.
Answer:
Both are only physical changes
Explanation:
Sediment settling to the bottom of a muddy puddle is a physical change and a puddle freezing into ice on a cold night is also a physical change. Both are only physical changes.
What is Physical change ?Physical changes are those changes in which substance changes physical properties only. Properties like temperature, pressure, shape, color, size, state (solid, liquid and gas). These changes are temporary in nature. In physical change no new substances formed. It is reversible change. Sediment settling to the bottom of a muddy puddle is a physical change and a puddle freezing into ice on a cold night is also a physical change. Both are only physical changes.
What is Chemical change ?Chemical change are those changes in which substance changes chemical composition. These changes are permanent changes. In chemical change new substances formed and in chemical change substances can not get back into its original form. It is irreversible change. Sediment settling to the bottom of a muddy puddle and a puddle freezing into ice on a cold night both are not chemical changes as there is no new substances formed.
Thus, from the above conclusion we can say that Sediment settling to the bottom of a muddy puddle and a puddle freezing into ice on a cold night both are only physical changes.
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Currently, electricity from solar panel systems is cheaper than electricity produced from fossil fuel or nuclear power plants
True
False
What is the answer to this question
2
Explanation:
50/50 chance of getting correct
If someone stops taking a highly addictive drug abruptly and
begins to experience pain and depression, they are likely going
through:
WITHDRAWAL
TOLERANCE
OVERDOSE
DEPENDENCE
Answer:OVERDOSE
Explanation: Because when take a addictive drug you mostliky took too much and u cant stop.
Answer:
OVERDOSE
Explanation:
and this is not for question but on Netflix put the code 7424 in the search bar to get all of the anime on Netflix
A spoonful of salt is stirred into a pot of water.The salt is a
Answer:
the salt is a solute in this instance
A solution having a pH of zero is neutral.
Answer:
This is False.
Explanation:
Acid=0-6
Neutral=7
Base=8-14
Which of the following describes an object in static equilibrium?
A. A gorilla jumps straight into the air.
B.Asquid moves at a velocity of 10 m/s straight down.
C.A car drives in a circle at a constant speed of 8 m/s .
D.An elephant stands in one place without moving .
Answer:
D
Explanation:
An elephant standing in one place without moving is in static equilibrium. Therefore, option D is correct.
What is static equilibrium?Static equilibrium can be described as the sum of the exerting torques and forces on each part of the body that happens to be null.
In the static equilibrium of a body whose parts are in a state of rest. The essential condition for this type of equilibrium is that a body is not showing any form of movement.
In translational equilibrium, a body is not moving from one point to another while in rotational equilibrium is not spinning around a point. Translational equilibrium requires the sum of every outside force to be zero. Torque can be defined as a quantity that exerts the rotational movement of an object.
If two forces are acting on a body that is in the state of static equilibrium, where the total sum of forces is zero. Therefore, for the elephant standing in one place without moving there are only two forces i.e. the weight of the elephant and the normal force to balance it. Therefore, it describes in static equilibrium.
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How do the lengths of day contrast for the summer solstice and winter solstice?
When it is tilted away from the Sun, it is winter in the northern hemisphere. In between we have autumn and spring. The day that the Earth's North Pole is tilted closest to the sun is called the summer solstice. This is the longest day (most daylight hours) of the year for people living in the northern hemisphere.
The impacts of global warming are being felt and will be felt increasingly in your lifetime. What impacts are likely to be seen in the next few decades
Answer:
Hotter climate, more greenhouse gases, and less water
I hope this helps :)
Explanation:
What is the same about the moon’s rotation and revolution around Earth?
Answer:
The moon orbits the Earth once every 27.322 days. It also takes approximately 27 days for the moon to rotate once on its axis. ... When the moon is between the Earth and the sun, during the new moon phase, the back side of the moon is bathed in daylight.
Explanation: endg 2020 ;]
Given the balanced equation representing a reaction:
Fe2O3 + 2Al Al2O3 + 2Fe
During this reaction, the oxidation number of Al changes from
A) +3 to 0 as electrons are transferred
B) +3 to 0 as protons are transferred
C) 0 to +3 as electrons are transferred
D) 0 to +3 as protons are transferred
Answer:
C) 0 to +3 as electrons are transferred
Explanation:
[tex]Fe_{2}O_{3} + 2Al^{0} --> Al^{+3}_{2}O_{3} + 2Fe\\\\Al^{0} -3e^{-}--> Al^{+3}[/tex]
Photosynthesis occurs in the ____________and cellular respiration occurs in the ___________.
Group of answer choices
Explanation:
Photosynthesis occurs in chloroplasts, and cellular respiration occurs in mitochondria
Answer:
Chloroplast, mitochondria
Explanation:
Photosynthesis is a process that plants, algae, and some bacteria use to make their own food. They take light energy, carbon dioxide and water and produce glucose and oxygen. This process takes place in the chloroplasts.
Animals and plants both use a process called cellular respiration. This process takes glucose and oxygen, and creates ATP, carbon dioxide and water. Animals and plants use ATP to move, grow, and carry out cellular functions. This process takes place in the mitochondria.
2. What is the concentration of an acid that has 5.2 moles of HCI in 750 mL of water?
w
O A. 6.9 M
OB. 6.8 M
OC. 7.5 M
OD. 5.2 M
Answer:
A
Explanation:
You will convert 750mL into litters which will be .75 litters. Then you divide the moles by litters Morality / .75 Litters. when you do the math you will get 6.9
HELP I NEED TO EXPLAIN THE ANSWERS!!!
Propane burns in excess oxygen according to the following reaction.
C3H8 + 5O2 → 3CO2 + 4H2O
a.H ow many moles each of CO2 and H2O are formed from 3.85 mol of propane?
ans: 11.6 mol CO2, 15.4 mol H2O
b. If 0.647 mol of oxygen is used in the burning of propane, how many moles each of CO2 and H2O are produced? How many moles of C3H8 are consumed?
ans: 0.388 mol CO2, 0.518 mol H2O, 0.129 mol C3H8
Explanation:
A. Solve the answer using stoichiometry. This means that you have to look at the coefficients of the equation to solve this.
The problem gave the moles of propane used to form product. Your job is to find the moles of product formed. Use the equation to solve this. The coefficients represent moles.
Propane has no coefficient implying that the number in front of propane would be 1. CO₂ has a coefficient of 3, and H₂O has a coefficient of 4. This means that for every mole of propane, 3 moles of CO₂ and 4 moles of H₂O are formed.
Multiply the moles of propane by the coefficients of the products.
3.85 × 3 = 11.55 mol CO₂
3.85 × 4 = 15.4 mol H₂O
You have solved for moles of each product.
B. This problem has about the same concept as the one before. Look at the equation. For every 5 moles of O₂, 3 moles of CO₂ and 4 moles of H₂O are formed. For every 5 moles of O₂, 1 mole of propane is needed.
This time, however, you cannot simply multiply the amount of moles by the coefficient. This is because you need 5 moles, not 1, to get that many moles produced.
This time, multiply the moles by the coefficients over the original coefficient.
0.647 × 3/5 = 0.388 mol CO₂
0.647 × 4/5 = 0.518 mol H₂O
0.647 × 1/5 = 0.129 mol C₃H₈
Moles of CO₂ and H₂O are produced by the 3.85 mol of propane is 11.55 and 15.4 moles respectively.
What is stoichiometry?Stoichiometry of the reaction tells about the amount of species present before and after the completion of reaction.
Given chemical reaction is :
C₃H₈ + 5O₂ → 3CO₂ + 4H₂O
From the stoichiometry of the reaction it is clear that:
1 mole of C₃H₈ = produces 3 moles of CO₂
1 mole of C₃H₈ = produces 4 moles of H₂O
1 mole of C₃H₈ = reacts with 5 moles of O₂
5 moles of O₂ = produces 3 moles of CO₂
5 moles of O₂ = produces 4 moles of H₂O
5 moles of O₂ = reacts with 1 mole of C₃H₈
3.85 moles of C₃H₈ = produces 3×3.85=11.55 moles of CO₂3.85 moles of C₃H₈ = produces 4×3.85=15.4 moles of H₂O0.647 moles of O₂ = reacts with 1/5×0.647=0.129 moles of C₃H₈0.647 moles of O₂ = produces 3/5×0.647=0.388 moles of CO₂0.647 moles of O₂ = produces 4/5×0.647=0.517 moles of H₂OHence required moles are calculated above.
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What do isotopes of an element contain?
Answer:
Explanation:
An isotope is a form of a chemical element whose atomic nucleus contains a specific number of neutron s, in addition to the number of proton s that uniquely defines the element. The nuclei of most atom s contain neutrons as well as protons
3.0 L of a gas has a temperature of 78 C find the volume of the gas at standard temperature
Answer:
= 2.33 L
Explanation:
V1/T1 = V2/T2
V1 = 3.0 L
T1 = 78 + 273
= 351 K
At s.t.p the temperature is 273 K and pressure is 1 atm.
V2 = ?
T2 = 273 K
V2 = V1T2/T1
= (3.0 ×273)/351
= 2.33 L
Explanation:
ik it is confusing but that is what i got
Answer:
Thanks
Explanation:
PLEASE HELP! Sonar is used to inspect pipelines and bridge foundations. In this scenario, sonar takes advantage of the fact that
A. sound waves can reflect.
B. sound waves can diffract.
C. sound waves can spread out.
D. sound waves can refract.
There is no science subject.
Explanation:
B. sound waves can diffract.
....,........
What is the density of a liquid that has a mass of 27g and a volume of 30mL?
-Carrie
A liquid with a mass of 27g and a volume of 30 ml has a density is 0.9 g/ml.
What is the density of a liquid?You follow the same procedure as you would for a solid to determine the density of a liquid. Determine the fluid's volume, mass it, and then divide mass by volume.
Weigh the fluid in the container, pour it out, weigh the empty container, and then subtract the empty container's mass from the mass of the filled container to get the fluid's mass.
Calculate the substance's density in mg/mL, it is 1000 mg/mL for water. You may calculate the quantity in milliliters by dividing the milligram amount by the density.
Therefore, one of the most important ones is that a substance's density will influence whether it will float on another, 0.9 g/ml is the density of a liquid.
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