The microscopes used today are just like the ones used by Leeuwenhoek and Hooke. True or false
Answer:
False
Explanation:
While we do know that A. Leeuwenhoek used a simple microscope that consisted of only 1 lens, Hooke used a compound microscope. Although, after trying a compound microscope, Hooke found out that it strained his eyes and continued to use a simple microscope for his Micrographia.
Thus, we can say that the (compound) microscopes used today are different than the (simple) microscope used by Hooke and Leeuwenhoek.
explain how stalacitites and stalagmites are formed
As the redeposited minerals build up after countless water drops, a stalactite is formed. If the water that drops to the floor of the cave still has some dissolved calcite in it, it can deposit more dissolved calcite there, forming a stalagmite. Speleothems form at varying rates as calcite crystals build up. They are formed from condensation inside a cave, dripping off the ceiling.
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Check all reasons why a book was used.
it increased pressure on the gas.
it supported additional weights.
it balanced the syringe.
We can confirm that for the experiments regarding Boyle's law, the book was used to increase pressure on the gas and add additional weight.
Why is the book used in these experiments?The book is used for the reasons described in options 1 and 2 of the question. The book supports additional weights on the container, meaning that through these added weights we can increase the pressure being applied to the gas and see how said pressure affects the volume of a gas.
Therefore, we can confirm that the book was used to increase pressure on the gas and add additional weight.
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Answer: A, B
Explanation: edge2023
how do you find the oxidation numbers for H3PO4
Which of the following ionic compounds has a transition metal in it?
a. KOH
b. Cs2S
c. CuSO4
d. MgCl2
Considering that copper occupies Group 11, the ionic compound with a transition metal in it is c. CuSO₄.
What is a transition metal?A transition metal is any of the set of metallic elements occupying a central block (Groups 3–12) in the periodic table. The differential electron occupies a d subshell.
Which of the following ionic compounds has a transition metal in it?
a. KOH. No, K occupies Group 1.b. Cs₂S. No, Cs occupies Group 1.c. CuSO₄. Yes, Cu occupies Group 11.d. MgCl₂. No, Mg occupies Group 2.The ionic compound with a transition metal in it is c. CuSO₄.
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Which type of bond forms when two or more atoms share electrons?.
Answer:
Covalent
Explanation:
Covalent is the sharing of electrons and Ionic is transferring of electrons.
Answer:
Covalent bonds
Explanation:
the interatomic linkage that results from the sharing of an electron pair between two atoms
Vascular plants have an internal transport system to move water and nutrients throughout the plant. Which of these is used to transport water from the roots to the leaves?
Oxygen gas occupies a volume of 95 ml at 305 k. what volume will it occupy at 550 k?
The new volume of the oxgen gas as the temperature is increased is 171.3ml.
Given the data in the question;
Initial olume of oxygen gas; [tex]V_1 = 95ml = 0.095L[/tex]Intial temperature; [tex]T_1 = 305K[/tex]Final temperature; [tex]T_2 = 550K[/tex]Final volume of oxygen gas; [tex]V_2 = \ ?[/tex]Charles's lawCharles's law states that "the volume occupied by a definite quantity of gas is directly proportional to its absolute temperature.
It is expressed as;
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}[/tex]
To determine the new volume of the oxgen gas as the temperature is increased, we substitute our given values into the expression above.
[tex]\frac{V_1}{T_1} = \frac{V_2}{T_2}\\ \\ \frac{0.095L}{305K} = \frac{V_2}{550K}\\\\V_2 * 305K = 0.095L * 550K\\\\V_2 * 305K = 52.25LK\\\\V_2 = \frac{52.25LK}{305K} \\\\V_2 = 0.1713L\\\\V_2 = 171.3ml[/tex]
Therefore, the new volume of the oxgen gas as the temperature is increased is 171.3ml.
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04. a migrating bird can travel at a speed of 10m/s. how far it will travel in 20min at this speed?
Give your answer in meters (m) and in kilometers (km).
Answer:
12000m & 12km
Explanation:
covert 20mins into seconds.
20 x 60= 1200seconds
distance = speed x time
distance = 10 x 1200
distance = 12000m
1km=1000m
12000/1000= 12km
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what is the Acid name for HArO3
HELP PLS DUE TODAY
Biotechnology Activity
Now that you are more familiar with the benefits, risks, and impacts of biotechnology, it is time for you to take a stand! Your task is to choose one of the following types of biotechnology: genetic engineering, cloning, or artificial selection.
You will then write a one- to two-paragraph summary describing your chosen type of biotechnology. You will then need to argue for either the benefits or the risks of your chosen type. Your arguments should present your position, and then give the evidence that led you to this position. Be sure to include the following in your argument:
a description of your chosen type of biotechnology (genetic engineering, cloning, or artificial section)
one benefit or one risk for the individual (based on whether you are for or against it)
one benefit or one risk for society (based on whether you are for or against it)
one benefit or one risk for the environment (based on whether you are for or against it)
A picture (you may hand draw, take photos in nature, or use stock images)
Answer: Ok
Explanation: Explanation:Using recombinant DNA technology to modify an organism's DNA to achieve desirable traits is called genetic engineering. Addition of foreign DNA in the form of recombinant DNA vectors that are generated by molecular cloning is the most common method of genetic engineering.
In a redox reaction, which ion would you expect to be more easily reduced?.
The chemical formula for water is what does the formula show about each element in the compound?.
This states that
1 molecule of water contains
2 hydrogens(H)1 Oxygen(O)And if we write the chemical reaction
2H_2+O_2—›2H_2OIf Thomson’s atomic theory was accurate, what would the results of Rutherford’s gold foil experiment have been?
Answer:
If Thomson's atomic theory was accurate, the positively charged particles would have gone through the foil.
what is the advantege of relase energy in a chemica reaction
Answer:
A chemical reaction can release chemical energy stored in batteries, natural gas, and even coal. The main advantage of chemical energy is that it is abundant in nature. Chemical energy can be produced by many organic materials.
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sorry i know this:
4. 2 methyl 2 heptene
which word help the reader understand the meaning of stratum in paragraoh 3.
Answer:
It should be D
Explanation:
Stratum is a layer of rock in the ground
what challenges arise when nuclear material is removed from a power plant?
Answer:
it destroy the surrounding area
At what minimal temperature is the following reaction, the reduction of magnetite by graphite to elemental iron, spontaneous?
Fe3O4(s)+2C(s,graphite)→2CO2(g)+3Fe(s)
The values of enthalpy change, entropy change and temperature all determine the spontenity of a reaction.
What is a sponteanous reaction?A sponteanous reaction is one which has the change in free energy as negative. We know that ΔG = ΔH - TΔS. The spontenity of a reaction depends on;
i. enthalpy change
ii. entropy change
iii. temperature
Since the values in the qestion are not given, the question is incomplete and we can not obtain a numerical value in order to decide the sponteanity of the reaction.
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Work out the specific heat capacity of each metal from the data given:
Gold- the temperature of 2.00g of gold is raised by 11.7°C when 3.00J of energy is supplied
Answer:
C) Solar Energy, i,e, Energy that comes from the sun
chemistry question
label them
reactants, products,activation energy etc
In the illustration A would be the reactants and E would be the products. B would be the activation energy (Ea), C would be the potential energy of reactants, F would be the potential energy of products, and D would be the potential energy change.
Energy DiagramThe energy diagram shows the energy states of the components of reactions.
From the diagram, A being the reactant becomes E, the product. The minimum energy that A needs to overcome to arrive at the product (activation energy) is B.
The energy state of the reactant A before becoming the product is C while that of the product E is F. The difference in the energy state of A and E is D.
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Select all that apply.
Which items are properties of acids?
soapy
sour
sweet
sharp
possible burns
for 10 points
Answer:
Sour and Possible Burns
Explanation:
Bases are soapy, not acids.
All acids are sour to taste.
Neither bases nor acids are sweet.
Sharp is a physical trait for things such as knives, not acidic liquids.
Acids can cause burns if handled incorrectly.
If you are given a 0. 32 g piece of sodium metal to react with water, how many moles of hcl would it take to neutralize the sodium hydroxide produced?.
Answer:
.0139
Explanation:
The number of moles of HCl would take to neutralize the sodium hydroxide produced is equal to 0.0139 moles.
What is a neutralization reaction?A neutralization reaction can be defined as a chemical reaction in which an acid and base react with each other to prepare salt and water.
When HCl reacts with NaOH and the resulting salt is sodium chloride and water.
HCl + NaOH [tex]\longrightarrow[/tex] NaCl + H₂O
The chemical reaction, chemical reaction of sodium metal and water gives hydrogen gas and sodium hydroxide:
[tex]2Na+ 2H_2O \longrightarrow 2NaOH + H_2[/tex]
Given the amount of sodium metal = 0.32 g
The moles of sodium metal = 0.32/23 = 0.0139 moles
If the 2 moles of sodium produce sodium hydroxide = 2 mol
The 0.0139 moles of sodium will produce NaOH = 0.0139
Therefore, 0.0139 moles of HCl is required to neutralize 0.0139 moles of NaOH.
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4. How does the sun release its heat?
Answer:
radiation i think
Explanation:
thts why the solar panels can maķe electricity
A pure sample of a monoprotic acid is dissolved in water. the sample is titrated with sodium hydroxide solution. at the point where 20.0 ml of the naoh solution has been added, the ph is 4.15. the phenolphthalein endpoint of the titration is observed when 50.0 ml of naoh have been added. what is the pka of the acid
Answer:
21 22 23 24 25 26 27 28 29 30
Explanation:
Based on the Law of Conservation of Mass, what's the minimum amount of Magnesium that will react with 32g of Oxygen to produce 80.6g of Magnesium Oxide?
mass before reaction = mass after reaction
Mg + O = MgO
Mg + 32 = 80.6
Mg = 80.6 - 32 = 48.6 (a)
Many human epithelial cells produce sticky mucus. Which of the following statements best describes how this mucus functions in nonspecific adaptive immunity?
provides an impenetrable outer covering that cannot be penetrated by most pathogens
assists in the physical removal of pathogens from the body
produces antibodies that will cause pathogen lysis
promotes growth of the body's normal microbiota
Answer:
The answer is provides an impenetrable outer covering that cannot be penetrated by most pathogens :)
Explanation:
The cells line the skin so then it makes it really difficult for germs to get through. :)
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PLEASE HELP!!!! WILL MARK BRAINLIEST! A balloon is filled with 257.88 L of gas at STP. When the balloon is cooled to -20.5°C, and the pressure decreased to .40 atm, what will the volume of the balloon be?
Answer:
3.97 psi
Explanation:
The new pressure can be found by using the formula for Boyle's law which is
P1 V1 = P2 V2
The second-order rate constant for the decomposition of NO2 (to NO and O2) at 573 K is 0.54 M-1 s-1. Calculate the time for an initial NO2 concentration of 0.20 mol/L to decrease to a) one-half; b) one-sixteenth; c) one-ninth of its initial concentration.
The rate of second order reaction depends on the change in the concentration of the reactants.
Second order reaction:A second order reaction is one in which the rate of reaction depends on the concentration of reactants.
For a second order reaction;
1/[A] = kt + 1/[A]o
When concentration deceresases to one-half;
1/0.1 = 0.54t + 1/0.20
1/0.1 - 1/0.20 = 0.54t
10 - 5/0.54 = t
t = 9.3 s
When concentration deceresases to one-sixteenth;
1/0.0125 = 0.54t + 1/0.20
1/0.0125 - 1/0.20 = 0.54t
80 - 5 = 0.54t
t = 80 - 5/0.54
t = 149 s
When concentration deceresases to one-ninth;
1/0.022 = 0.54t + 1/0.20
1/0.022 - 1/0.20 = 0.54t
45 - 5 = 0.54t
t = 45 - 5/0.54
t = 74 s
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Explain why the available amount of water per person differs between countries
Answer:
because in the different countries it is distributed unevenly.
Explanation:
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