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:
Consider the nuclear equation below. Superscript 235 subscript 92 upper U right arrow superscript 4 subscript 2 upper H e. What is the nuclide symbol of X? Superscript 231 subscript 94 upper P u. Superscript 235 subscript 90 upper T h. Superscript 239 subscript 94 upper P u. Superscript 231 subscript 90 upper T h.
Answer:
[tex]\rm_{90}^{231}\text{Th}[/tex]
Explanation:
The unbalanced nuclear equation is
[tex]\rm _{92}^{235}\text{U} \longrightarrow \, _{2}^{4}\text{He} + X[/tex]
Let's write X as a nuclear symbol.
[tex]\rm _{92}^{235}\text{U} \longrightarrow \, _{2}^{4}\text{He} + _{Z}^{A}\text{X}[/tex]
The main point to remember in balancing nuclear equations is that the sums of the superscripts and of the subscripts must be the same on each side of the reaction arrow.
Then
235 = 4 + A , so A = 235 - 4 = 231, and
92 = 2 + Z , so Z = 92 - 2 = 90
And your nuclear equation becomes
[tex]\rm _{92}^{235}\text{U} \longrightarrow \, _{2}^{4}\text{He} +\, _{90}^{231}\text{X}[/tex]
Element 90 is thorium, so
[tex]\rm X = _{90}^{231}\text{Th}[/tex]
Answer:
its d
Explanation:
edg
13. Which activity causes the amount of carbon dioxide to increase in the
atmosphere?
fishing
picking up trash
machine use in factories
using hydroelectric power
Answer:
C.
Explanation:
Using machines in factories increases the amount of carbon dioxide in environment.
A scientist has 0.12 miles of a gas at a pressure of 4.06 kPa and a volume of 14 liters in an enclosed container. What is the temperature of the gas in the container?
Answer:
56972.17K
Explanation:
P = 4.06kPa = 4.06×10³Pa
V = 14L
n = 0.12 moles
R = 8.314J/Mol.K
T = ?
We need ideal gas equation to solve this question
From ideal gas equation,
PV = nRT
P = pressure of the ideal gas
V = volume the gas occupies
n = number of moles
R = ideal gas constant
T = temperature of the gas
PV = nRT
T = PV / nR
T = (4.06×10³ × 14) / (0.12 × 8.314)
T = 56840 / 0.99768
T = 56972.17K
Note : we have a large number for temperature because we converted the value of pressure from kPa to Pa
Someone can help me whit this? I have the whole document too.
Answer:
1a. Metalloids have properties that are between metals and non-metals, they are alo known as semi-metals.
b.) The yellow border consisting of silicon, boron, Ge As, etc., are metalloid elements
2a.) Non-metals are on the right side of the periodic table.
B.) Non-metals have poor conductivity, are not malleable or ductile, are not sonorous. They are basically the opposite of metals.
Write the symbol for the ion with 68 electrons, 72 protons, and 106 neutrons.
Answer:
I think it should be Hafnium which is Hf.
Which is a characteristic of the polar water molecule?
.
a tetrahedral electron domain geometry with covalently bonded atoms
a tetrahedral electron domain geometry with ionically bonded atoms
a linear shape with polar covalent bonds
a linear shape with polar ionic bonds
Answer:
A tetrahedral electron domain geometry with covalent bonded atoms.
Which hydrocarbon is saturated?
1. C2H2
2)C3H4
3)C4H6
4)C4H10
Answer: 4, c4h10
Explanation: source:
C4H10 is a saturated hydrocarbon.
What is a hydrocarbon?A hydrocarbon is an organic compound which consists of carbon (C) and hydrogen (H). For example, C4H10, C2H2 etc. There are four types of hydrocarbons namely alkanes, alkenes, alkynes and aromatic hydrocarbons.
What is a saturated hydrocarbon?A saturated hydrocarbon is that hydrocarbon in which the carbon atoms are linked only by single bonds. For eg: CH4, C2H6 etc. All alkanes are saturated hydrocarbons.
An unsaturated hydrocarbon is that hydrocarbon in which the carbon atoms are linked through double or triple bonds. For eg: C2H2, C3H4 etc. Alkenes and alkynes are unsaturated hydrocarbons.
C2H2, C3H4 and C4H10 are all unsaturated hydrocarbons. C4H10 is a saturated hydrocarbon as all the carbons are linked through single bonds.
Hence, D is the correct option.
To learn more about hydrocarbons here
https://brainly.com/question/17578846
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How many neutrons does the isotope N-14 have? 6 7 8 9
Answer:
7
Explanation:
An isotope is an atom that has a different number of neutrons than the standard for that atom.
1)Nitogen -14 has 7 protons in the nucleus for its an isotope of nitrogen which has an atomic number of 7.
2)Now we need to find the number of neutrons. This is implied in the name of the isotope whereby the protons and neutrons add up to its atomic number. So
(14-7 protons= 7 neutrons.)
So it has 7 neutrons.
7
I just did it on edgen :)
Describe How do you make a metal object such as a nail into a magnet? What happens to make it magnetic?
Answer:
Stroking a magnet across it or high voltage
Explanation:
Stroking a magnet across it causes the alignment of the domain, making it magnetic temporarily. Also, high voltages from batteries can make it magnetic too, doing the same thing.
Suppose you need to heat food. What wave type from the electromagnetic spectrum could you use?
Answer:
Microwave radiation
Explanation:
This radiation is the one used in microwaves.
Answer:
Infrared
Explanation:
Infrared light is used by electrical heaters, cookers for cooking food, and by infrared cameras which detect people in the dark. Infrared light has frequencies which are absorbed by some chemical bonds. The internal energy of the bonds increases when they absorb infrared light, which causes heating.
What is solubility?
- A solution in which no more solute will dissolve.
- The amount of solute it takes to make a supersaturated solution.
- The amount of solute that will dissolve in a given amount of solvent.
- The amount of solvent it takes to dissolve 100 g of solute.
Answer:
the correct answer is c
Explanation:
Which describes the pH of an antacid that is used to neutralize stomach acid?
Answer:
calcium carbonate, is 9.91
Explanation:
Answer:
B or The antacid is basic and will neutralize the acid entering the esophagus.
Explanation:
8 points
11. Humans have negatively impacted the environment for
years. Which
events represent ways humans have harmed the environment. (Choose all
that apply.)
burning fossil fuels
minning
planting trees
using solar power
using fertilizers
recycling
(There’s more than one answer btw)
Answer:
Burning Fossil Fuels
Mining
Using Fertilizers
Imagine that hotter magma is lying beneath an area of cooler magma deep in the mantle. What do you predict will happen?
Answer:
it will explod because off all of the prussere but on to it.
Explanation:
Which of these metals is least likely to be involved in chemical reactions?
A. iron
B. tin
C. gold
D. copper
Answer:
C gold
Explanation:
How many moles of nitrogen gas (N2) are found?
Answer:
28.0134 moles
Explanation:
There are 28.0134 moles are found in nitrogen gas(N2).
Hope this helps!!! PLZ MARK BRAINLIEST!!!
11. What is the mass number
of an element if its atom
contains 10 protons, 10
electron, and 12 neutrons?
A 12
C20
D. 32
Answer:The mass numbr is 22
Explanation:
Mass number=number of protons+ number of neutrons....which is 10+12=22
what tool do you have to use to find exactly 15.7 milliliters of vinegar? A beaker B balance C meter stick D thermometer E stopwatch F graduated cylinder
Answer:
A Graduated Cylinder would be you answer because they have markings for smaller measurnments like milliliters
Explanation:
A dipole consists of a positive charge and a negative charge. To
determine the electric potential at a position between the two charges
in an electric field created by a dipole, calculate the electric potential
generated by.
Answer:
k
Explanation:
2. Which ecoregions are most likely to experience a drought or heatwave?
a. West Texas Ecoregions
b. Central Texas & Panhandle Ecoregions
c East Texas Ecoregions
d. Coastal Ecoregions
Answer: A--- West Texas Ecoregions.
Explanation:
The West Texas Eco regions are high plains characterized with dry flat land which receives lowest amount of rainfall thereby having very short grass vegetation. this flat land has a leveled plateau which ranges from about 3000 to 4500 ft and receives the highest winds due to its nature.
Because It is a dry region, it is prone to heatwaves and drought.
Titanium will react with magnesium oxide but sodium reacts with titanium oxide.
The position of titanium will be
a. above sodium
b. .below magnesium but above iron
c. below sodium but above magnesium
d.. below silver
Answer:
below sodium but above magnesium
Explanation:
It is necessary to note that only a metal that is above another metal in the activity series can displace it from its compound.
The first statement said that titanium reacts with magnesium oxide. The implication of this is that titanium can displace magnesium from its oxide. This is only possible if titanium is above magnesium in the activity series.
The second statement says that sodium reacts with titanium oxide. This implies that sodium metal can displace titanium from its oxide. For this to occur, then sodium must be above titanium in the activity series of metals. Hence the answer above.
HELP ME!!ILL GIVE U BRAINLIESTT!!!!!
Calculate the concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L. Please show work!
Answer: The concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L is 0.036 M
Explanation:
Molarity of a solution is defined as the number of moles of solute dissolved per liter of the solution.
[tex]Molarity=\frac{n}{V_s}[/tex]
where,
n = moles of solute
[tex]V_s[/tex] = volume of solution in L
moles of [tex]Ca(OH)_2[/tex] = [tex]\frac{\text {given mass}}{\text {Molar mass}}=\frac{13.0g}{74g/mol}=0.18mol[/tex]
Now put all the given values in the formula of molality, we get
[tex]Molarity=\frac{0.18}{5.0L}=0.036M[/tex]
Therefore, the concentration, in moles per litre, of a solution formed when 13.0 g of calcium hydroxide is dissolved in 5.0 L is 0.036 M
What does hydropower rely on to create energy? A. heat from Earth's interior B. energy from the sun C. biomass D. flowing water
Answer:
D. flowing water
Explanation:
Due to flowing water, that helps create energy. It was used by farmers as far back as ancient Greece for mechanical tasks like grinding grain. Hydropower is also a renewable energy source and produces no air pollution or toxic byproducts
Where are most insect eggs laid on a corpse? *
A)On the head only.
B)Under the corpse.
C)Only on exposed skin
D)Body openings/wounds
Answer: usually D (but it could also be C)
Explanation:
Grains of sugar dissolve more quickly in tea than do sugar cubes. Which answer correctly describes why this occurs?
The sugar grains form a saturated solution.
The sugar cube is already at equilibrium.
The sugar grains have a greater surface area.
The sugar cube is at great pressure.
Answer:
sugar cube is at great pressure
Explanation:
this is because great pressure means its more solid
What kind of bonds are hydrogen bonds?
Answer:
electromagnetic attraction between polar molecules in which hydrogen is bound to a larger atom, such as oxygen or nitrogen. I hope that was the answer u was looking for
Answer:
A hydrogen bond is the electromagnetic attraction between polar molecules in which hydrogen is bound to a larger atom, such as oxygen or nitrogen.
Explanation:
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How many formula units are in a sample of salt, NaCl, with a mass of 87.75 grams?
Answer:
Number of Nacl units in mass of [tex]87.75[/tex] grams [tex]= 1.50[/tex]
Explanation:
Mass of one unit of NaCl or one atom of NaCl is [tex]58.44[/tex] g/mol
The total mass of the NaCl is [tex]87.75[/tex] grams.
The number of unit in [tex]87.75[/tex] grams of NaCl is equal to [tex]87.75[/tex] grams divided by mass of one unit of NaCl i.e [tex]58.44[/tex] g/mol
This can be mathematically be presented as
[tex]\frac{87.75}{58.44} \\[/tex] Units
[tex]1.50[/tex] Units
Number of Nacl units in mass of [tex]87.75[/tex] grams [tex]= 1.50[/tex]
When water vapor is cooled, it re-forms into water droplets. Why does this represent a conservation in mass?
50 POINTS!!!
Answer:
People, especially kids, tend to think that when water evaporates it just disappears, or turns into the air. But we know based on the law of conservation of mass that any time water changes state it keeps the same mass!
Similarly, when water vapor turns to water droplets, when it goes from its gas to its liquid state, it still has the same mass. It's just in a different phase. This is a perfect example of conservation in mass!
How does a catalyst increase the rate of a reaction?
A) It decreases the enthalpy change of the reaction.
B) It lowers the potential energy of the reactants.
C) It provides a lower activation energy for the reaction.
D) It raises the potential energy of the products.
Answer:
C) It provides a lower activation energy for the reaction is the correct answer.
Explanation:
A catalyst increases the rate of the chemical reaction by lowering the activation energy for a reaction.Catalyst is used to increase the reaction rate, it remains unchanged in the chemical reaction and it does not change the equilibrium constant.Activation energy is a minimum amount of energy required to initiate the reaction.