Answer:
No, not all are harmful.
Explanation:
There are bacterias that are harmful, yes, but millions, maybe even billions are helpful. Probiotics, healthy bacteria, as some like Lactobacilli and Bifidobacterium. There are a lot more, but just these two examples are helpful. Lactobacili is helpful with your digestive system. Bifidobacterium is geared towards your mouth and the vaginal area of women in mammals, like humans.
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-No one
Consider the substances below. • 1 mol of beryllium • 1 mol of salt • 1 mol of water • 1 mol of hydrogen which statement is true about these substances? they have exactly the same mass. they have different numbers of particles. they have the same number of atoms. they have different masses.
True statement for 1 mole of salt, water and hydrogen is that they have the same number of atoms and different masses.
What is Avogadro's Number?Avogadro's Number is that number which tells about the number of entities present in one mole of any substance and it is equal to 6.022×10²³.
Means in one mole of any substance 6.022×10²³ number of atoms of that substance will present.
Relation between moles and mass will be represented as:
n = W/M, where
W = given mass
M = molar mass
So for any given moles, mass of substance will be different as molar mass of all substances are different.
According to given two concepts in 1 mole of salt, water and hydrogen same number of atoms are present but they all will have different masses.
Hence, they have the same number of atoms and different masses.
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Answer:
D. They have different masses
Explanation:
Which of these properties of an iron nail is a physical property?
a) does not burn when a flame is applied
b) reacts with hydrochloric acid to release hydrogen gas
c) solid at room temperature
d)rusts
The answer choice which represents a physical property of Iron is; Choice C; solid at room temperature.
Physical Properties of IronPhysical properties of elements are properties observed and measured without changing the makeup, or composition, of a substance. They include characteristics such as color, density, and temperature of phase changes such as melting point or boiling point.
On this note, the fact that iron is solid at room temperature is a physical property.
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Which two wire properties would provide the greatest resistance to the flow of a current? short, thin long, thin hot, thick cool, thick
The two properties which provide the greatest resistance to the flow of a current are the long and thin wires.
What is resistance?Resistance is the quantity which define the flow of current from any wire and it is represented as:
R ∝ l/A, where
l = length of wire
A = cross section of wire
From the relation it is clear that resistance is high in long wire and thin wire.
So, required properties are long and thin.
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Answer:
B.
Explanation:
the answer is the second option.
What gas is a byproduct of agricultural production?.
Answer:
Explanation:
Animal waste is broken down, producing methane gas
What is the hydroxide ion concentration of a solution with a hydrogen ion concentration of 7.58 × 10-10 M?
If equal volumes of 1.0 M HCl and 1.0 M AgNO3 are combined in a beaker, will a solid precipitate form?
If 5 mol of oxygen gas effuses through an opening in 10 seconds, how long will it take for the same amount of hydrogen gas to effuse under the same conditions?
( a ) 1.6 s
( b ) 2.5 s
( c ) 40 s
( d ) 160 s
Answer:
B
Explanation:
Recall the law of effusion:
[tex]\displaystyle \frac{r_1}{r_2} = \sqrt{ \frac{\mathcal{M}_2}{\mathcal{M}_1} }[/tex]
Because 5 mol of oxygen was effused in 10 seconds, the rate is 0.5 mol/s.
Let the rate of oxygen be r₁ and the rate of hydrogen be r₂.
The molecular weight of oxygen gas is 32.00 g/mol and the molecular weight of hydrogen gas is 2.02 g/mol.
Substitute and solve for r₂:
[tex]\displaystyle \begin{aligned} \frac{(0.5\text{ mol/s})}{r_2} & = \sqrt{\frac{(2.02\text{ g/mol})}{(32.00\text{ g/mol})}} \\ \\ r_2 & = \frac{0.5\text{ mol/s}}{\sqrt{\dfrac{(2.02\text{ g/mol})}{(32.00\text{ g/mol})}}} \\ \\ & = 2.0\text{ mol/s}\end{aligned}[/tex]
Because there are 5 moles of hydrogen gas:
[tex]\displaystyle 5.0\text{ mol} \cdot \frac{1\text{ s}}{2.0\text{ mol}} = 2.5\text{ s}[/tex]
In conclusion, it will take about 2.5 seconds for the hydrogen gas to effuse.
Check: Because hydrogen gas is lighter than oxygen gas, we expect that hydrogen gas will effuse quicker than oxygen gas.
Elisa was walking through her neighborhood one afternoon and came upon a cat that was stuck under a fallen tree branch. The branch was large and heavy, but Elisa was able to lift it and free the cat.
Which gland helped Elisa to lift the branch?
thymus
pancreas
ovary
adrenal
Based on this information, the gland that helped Elisa to lift the branch is the adrenal gland.
What is the adrenal gland?They are two small organs responsible for secreting hormones such as cortisol, adrenaline or noradrenaline into the bloodstream.
These hormones have to do with how the body responds to stress to help the body get a boost of energy to better handle an emergency situation, and some are vital for survival.
Therefore, we can conclude that based on this information, the gland that helped Elisa to lift the branch is the adrenal gland.
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Answer:
D- Adrenal
Explanation:
How many different principal quantum numbers can be found in the ground-state electron configuration of nickel
4
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Questions
1. The introduction to this chapter says that “we live immersed in
a gaseous solution.” What does that mean?
2. How are the three states of matter similar, and how do they
differ?
3. Figure 13.1 shows an experiment that can be used effectively
to demonstrate the pressure exerted by the atmosphere. Write
an explanation of this experiment to a friend who has not yet
taken any science courses to help him understand the concept
of atmospheric pressure.
We live immersed in a gaseous solution means that we are living in an environment where different types of gases are present.
What this phrase means?When we talk about living in this gaseous solution, we means atmosphere. We know that atmosphere is the mixture of different gases.
So we can conclude that we live immersed in a gaseous solution means that we are living in an environment where different types of gases are present.
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At what temperature would 2. 10 moles of N2 gas have a pressure of 2. 25 ATM and in 25. 0 L tank?
Answer:
About 326 K.
Explanation:
Recall the ideal gas law:
[tex]\displaystyle PV = nRT[/tex]
Where P is the pressure, V is the volume, n is the number of moles, R is the universal gas constant, and T is the temperature.
Because we want to solve for temperature T:
[tex]\displaystyle T = \frac{PV}{nR}[/tex]
Substitute and evaluate. R has a value of 0.08206 L-atm/mol-K:
[tex]\displaystyle \begin{aligned} T & = \frac{(2.25\text{ atm})(25.0\text{ L})}{(2.10\text{ mol})\left(\dfrac{0.08206\text{ L - atm}}{\text{mol - K}}\right)} \\ \\ & = 326\text{ K}\end{aligned}[/tex]
In conclusion, the temperature of the gas will be about 326 K.
A 687.6 g sample of aluminum was heated by applying 8,284.4 J of energy. If the initial temperature of the aluminum was 23.1 oC, what was the final temperature of the sample, in degrees Celsius
The final temperature of the sample, in degrees Celsius is 36.6 °C
Heat capacity of a substanceFrom the question, we are to determine the final temperature of the sample
From the formula for heat capacity, we have that
Q = mcΔT
Where Q is the heat energy
m is the mass
c is the specific heat capacity of the subtance
ΔT is the change in temperature ([tex]\Delta T= T_{f} -T_{i}[/tex])
From the given information
m = 687.6 g
Q = 8284.4 J
[tex]T_{i}[/tex] = 23.1 °C
Putting the parameters into the equation, we get
[tex]8284.4 = 687.6 \times 0.89 \times (T_{f} -23.1)[/tex]
NOTE: Specific heat capacity of aluminum = 0.89 J/ g °C
Then,
[tex]8284.4 = 611.964 \times (T_{f} -23.1)[/tex]
[tex](T_{f} -23.1)= \frac{8284.4}{611.964}[/tex]
[tex](T_{f} -23.1)= 13.5[/tex]
[tex]T_{f} = 13.5 + 23.1[/tex]
[tex]T_{f} = 36.6 \ ^\circ C[/tex]
Hence, the final temperature of the sample, in degrees Celsius is 36.6 °C
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Which property of water contributes most to the ability of fish in lakes to survive very cold winters?.
Answer:
And that means fish must be able to survive down here. This is due to a special property of water: the elasticity of H2O. We know that when the temperature sinks below freezing, water first contracts and then expands as it begins to turn to ice. Ice, being lighter than water, floats.
Explanation:
The property of water that allows fish to survive in a lake that is frozen over is the fact that ice is less dense than liquid water.
Propose a solution to reduce the risk of flammable methane from concentrating in landfills.
Given what we know, we can confirm that one possible solution to the problem of flammable methane from concentrating in landfills is to use biosolids.
What are biosolids?Biosolids are organic matter that are created by recycling waste. These biosolids can act as a cover over landfills. The bacteria present in these solids then use this methane gas to create carbon dioxide gas. Though not ideal, this product is much less harmful to the environment than methane.
Therefore, we can confirm that one possible solution to the problem of flammable methane from concentrating in landfills is to use biosolids.
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A sample of thulium-171 has a mass of 0.4055 g and is radioactive. How much of this sample if left after 6 half-lives
Answer:
6.336 mg
Explanation:
.4055 x (1/2)^6 = .006336 gm
1. A hydrocarbon with this formula C4H6 is what?
a. indeterminate
b. s unstable
c. is somewhat reactive
d. is chemically inert
2. Why does carbon form covalent bonds?
a. It has the ability to release 4 electrons to another atom.
b. It has the ability to pull 4 electrons from another atom.
c. It has a strong electronegativity.
d. It will usually bond to multiple atoms which can provide a total of 4 additional electrons.
₹1
C_4H_6The general rule is C_n H_2n-2
(4,2(4)-2=8-2=6)It's Butyne and contains tripple bond
Is unstableHighly reactive inorder to break pi bond .Chemically activeOption A
#2
It has strong electronegativity
Carbon can both donate and accept 4 electrons but in practical it can't do because it requires so huge amount of energyCarbon has highest catenation property in world.1. The skeletal system is responsible for all of the following except:
a. Producing red and white blood cells
b. Providing oxygen to cells and removing carbon dioxide waste
Movement of the body
C. Movement of the body
D. Protecting vital organs
Answer:
B
Explanation:
the Answer is B .
The skeletal system produce blood cells , protect organs and helps the movement of the body .
What is the name of the acid with the formula h3po3.
Answer:
phosphorous acid
Explanation:
PO4 (phsophate) is a polyatomic, so when the subscript changes, so does the name and it becomes phosphite (one less oxygen atom)
if the name of the polyatomic ends in ite, the ending of the acid name becomes ous making it phosphorous acid.
You don't need to worry about the hydrogen in the naming process because it is an oxyacid, where you only really worry about the polyatomic (acid tells you there is hydrogen)
What is a molecule?
A. A particle with two or more atoms bonded covalently
B. A substance combining two or more elements
C. The smallest unit of an element
D. An atom with a positive or negative charge
Answer:
I believe your answer would be, "A" A particle with two or more atoms bonded covalently.
Explanation:
The definition of a molecule;
A group of atoms bonded together, representing the smallest fundamental unit of a chemical compound that can take part in a chemical reaction.
Difference between simple and fractional distillation.
Answer:
Simple distillation is the method used to separate substances in mixtures with significantly different boiling points, while fractional distillation is used for mixtures containing chemicals with boiling points close to each other.
How many valence electrons does a neutral atom of boron have?.
Answer:
3
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How to take off acrylic nails at home with acetone?.
How are proton , neutron and electron arranged in an atom
Fossil fuels are an important natural resource used by society. which of the following best describes fossil fuels? a. they are any liquid fuel derived from once-living matter. b. they are organic fuels derived from ancient plants and animals. c. they are fuels in which dinosaur fossils are commonly found. d. they are naturally occurring inorganic fuels like coal and petroleum.
Fossil fuels are an important natural resource used by society and they are organic fuels derived from ancient plants and animals.
What are fossil fuels?Fossil fuels are the natural resources means they are derived from the ancient resdue of plants and animale due to theor decomposition under high temperature and pressure.
Fossil fuel may be present in solid, liquid as well as in gaseous form so the given option (a) is incorrect.This is the wrong assumption that in the fossil fuel we get the fossils of dinosaur, so option (c) is incorrect.They are not inorganic fuels infact they are organic fuels.So, fossil fuels are organic fuels derived from ancient plants and animals.
Answer:
B cuh
Explanation:
trust me cus im just smart like dat
Which balances the equation mg o2 → mgo? mg 2o2 → 4mgo 2mg 2o2 → 2mgo 2mg o2 → 2mgo 2mg 2o2 → 4mgo
The equation which balances the given chemical reaction between magnesium and oxygen is 2Mg + O₂ → 2MgO.
What is balanced equation?Balanced equations are those in which all of the entities on both the reactant and product sides are equal.
Given chemical reaction:
Mg + O₂ → MgO
Above reaction is not balanced as number of oxygens are not equal on both sides.
Mg + 2O₂ → 4MgOBecause the amount of magnesium atoms is not equal, this is not a balanced equation.
2Mg + 2O₂ → 2MgOBecause the amount of oxygen atoms is not equal, this is not a balanced equation.
2Mg + O₂ → 2MgOThis is a balanced equation as number of each atoms are equal on both sides.
2Mg + 2O₂ → 4MgOBecause the amount of magnesium atoms is not equal, this is not a balanced equation.
Hence balanced equation is 2Mg + O₂ → 2MgO.
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Would a hurricane more likely remain a hurricane if it reached point A or point B? Explain your answer.
Answer:
Hurricane will stay hurricane.
Explanation:
(B) Water provides energy
(A) it will die if it's on land
How many liters of 2M HCl is needed to make 1 L of 0.05M HCI?
Answer:
0.025L of 2M HCl
Explanation:
This is a dilution problem involving the equation
[tex]M_1V_1 = M_2V_2[/tex]
Where M is molarity in grams/liter and V is volume in liters, and 1 and 2 represent initial and final states, respectively.
We know that:
[tex]M_1[/tex] = 2, as 2M HCl is the starting substance
[tex]M_2[/tex] = 0.05, as 0.05M HCl is the desired final substance
[tex]V_2[/tex] = 1, as 1 L is the desired volume of the final substance
Now you can solve for [tex]V_1[/tex].
[tex]2V_1 = 0.05(1)\\V_1 = \frac{0.05}{2} \\V_1 = 0.025[/tex]
Therefore, 0.025L of 2M HCl is needed to make 1 L of 0.05M HCl
In order to change the liquid milk into a solid, what had to happen
What does homeostasis refer to
Answer:
Homeostasis, as currently defined, is a self-regulating process by which biological systems maintain stability while adjusting to changing external conditions.
Explanation:
What is the total number of atoms in 0. 26mol of glucose, (C6H12O6)
Answer:
the answer is 6 atoms