A spoon. A beaker partially filled with liquid. A stirring rod. A graduated cylinder. Distilled water in a spray bottle. Which of the following tools could have become cross-contaminated during the experiment if you had not cleaned them carefully between successive tests? Spoon Beaker Stirring Rod Graduated Cylinder Distilled water in spray bottle.
Answers
Answer:
A,B,C,D
Explanation:
Answer:
A,B,C,D
Explanation:
Proof
Related Questions
who invented aeroplanes please tellme
Answers
Answer:
The Brazilian Santos Dumont
Explanation:
Santos Dumont created the 14 Bis airplane, the first airplane to perform a flight through 200 meters im Paris, France, in 23 October 1906
Orville and Wilbur Wright were the first two to actually invent the aeroplane. These American brothers also designed and flew their first creation after making it in their bicycle shop in December 17, 1903.
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please help as soon as possible!!!
Answers
Answer:
the kidney control the amount of water, ion, and other substances in the blood by excreting more or less of them in urine, also secretes the hormones that help maintain homeostasis
discussing the importance of the intelligence cycle in order to come up with intelligence
Answers
Answer:
Intelligence Analysis in a Cycle. Analysis resides within the larger intelligence cycle. The intelligence cycle determines the daily activities of the Intelligence Community. It starts with the needs of the intelligence "consumers' such as policymakers, military officials, and other decision makers who need intelligence for their activities.
Explanation:
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Answer:
The Intelligence Community's daily activities are determined by the intelligence cycle. It begins with the requirements of intelligence "consumers," such as policymakers, military officials, and other decision-makers who require intelligence to carry out their tasks.
Explanation:
Hope it helps
Something that potatoes and bacteria have in common is that they both reproduce(1 point)
via vegetative reproduction.
using tubers.
via binary fission.
asexually.
Answers
Potatoes reproduce asexually through the vegetive propagation mechanism. They have microscopic eyeballs which produce scaly leaves, and new potato plants emerge from these leaves. Only a single individual is responsible for the development of a new species.
Bacteria(Prokaryotes) reproduce asexually through binary fission, where the parent organism divides itself into two, producing genetically identical clones of itself.
The things that potatoes and bacteria have in common is that they both reproduce asexually. Thus option 4 is correct.
What is reproduction?Reproduction is defined as the biological process that creates new individual organisms from existing ones, also referred to as "offspring"
It can also be defined as the process by which identically minded organisms make new organisms.
There are two types of reproduction.
Sexual reproduction - It is defined as a method of reproduction whereby male and female gametes combine to create an offspring.Asexual reproduction - It is defined as a method of reproduction that doesn't modify the number of chromosomes or involve the fusing of gametes.Thus. the things that potatoes and bacteria have in common is that they both reproduce asexually. Thus option 4 is correct.
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NO ONE IS ANSWERING PLS HELP!
Which product in the reaction forms a precipitate?
AgCl
AgK
No precipitate formed
Answers
Answer:
AgCl
Explanation:
Got correct on E2020
Answer:
B: AgCl
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Which are characteristics of matter? (Select all that apply)
A. Created from mixtures
B. Takes up space
C. Makes up atoms
D. Has mass
Answers
Answer:
B and D.
Explanation:
Matter takes up space and has mass.
Answer:
B and D
Explanation:
It is because matter is anything that has mass (weight) and can occupy space
NaC2H3O2 HOH --> HC2H3O2 NaOH Since the two products are a weak acid and a strong base, we expect this mixture to be basic. When NaF reacts with water in the same manner, the products would be NaOH and _______.
Answers
The products of the reaction would be NaOH and HF
From the question,
We are to determine the products of the reaction between NaF and water in the same manner as the given reaction.
To determine the other product, we will write the equation for the reaction
The equation for the reaction is
NaF + H₂O → NaOH + HF
Hence, the products of the reaction would be NaOH and HF.
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Why does in the golf stream warm and provide it’s Rhode Island or Bangor Maine
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A student wants to conduct an investigation on vapor pressure Which statement describes how vapor pressure is related to an observable phase change?
A liquid boils when the vapor pressure equals the boiling point.
A liquid freezes when the vapor pressure equals the melting point.
A liquid freezes when the vapor pressure equals the atmospheric pressure.
A liquid boils when the vapor pressure equals the atmospheric pressure.
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The Whole Electrical Bonding Investigation Plan Quick check
1) B. boiling point, surface tension, vapor pressure
2) A. glycerin
3) C. the temperature at which additional heat energy causes the substance to change from a liquid to a gas
4) D. Heat each substance in liquid form to its boiling point. Measure the temperature of each substance
5) A. A liquid boils when the vapor pressure equals the atmospheric pressure.
You want to build a deck off your kitchen and you estimate that you will need 3000 #8 nails all together. Rather than pay extra for them to be put in little boxes, you go to a hardware store where they sell nails in bulk. How does the sales clerk count out 3000 #8 nails for you?
Answers
Answer:
The sales clerk can count your nails in 6 groups of 500 nails, or 30 groups of 100 nails to ease the counting process and garauntee a more accurate result.
Explanation:
Consider the following chemical reaction.
3 Zn(C₂H₃O₂)₂(aq) + 2 Na₃PO₄(aq) → 6 NaC₂H₃O₂(aq) + Zn₃(PO₄)₂(s)
A chemist makes a solution of zinc acetate by dissolving 20.5 g Zn(C₂H₃O₂)₂ in 105 mL H₂O. What is the concentration of this zinc acetate solution?
Answers
The concentration of the zinc acetate, Zn(C₂H₃O₂) solution is 1.067 M
We'll begin by calculating the number of mole in 20.5 g of Zn(C₂H₃O₂)₂Mass of Zn(C₂H₃O₂)₂ = 20.5 g
Molar mass of Zn(C₂H₃O₂)₂ = 65 + 2[(12×2) + (3×1) + (16×2)]
= 65 + 2[59]
= 183 g/mol
Mole of Zn(C₂H₃O₂)₂ =?Mole = mass / molar mass
Mole of Zn(C₂H₃O₂)₂ = 20.5 / 183
Mole of Zn(C₂H₃O₂)₂ = 0.112 mole Finally, we shall determine concentration of Zn(C₂H₃O₂). This can be obtained as follow:Mole of Zn(C₂H₃O₂)₂ = 0.112 mole
Volume = 105 mL = 105 / 1000 = 0.105 L
Concentration of Zn(C₂H₃O₂)₂ =?Concentration = mole / Volume
Concentration of Zn(C₂H₃O₂)₂ = 0.112 / 0.105
Concentration of Zn(C₂H₃O₂)₂ = 1.067 MTherefore, the concentration of the zinc acetate, Zn(C₂H₃O₂) solution is 1.067 M
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Explanation:
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Answer:
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Explanation:
where is your question?
"Which type of reaction is used to measure immune complex formation almost immediately after reagent has been added by the amount of light scattered at a particular angle"
Answers
Answer:
nephelometry
Explanation:
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the enthalpy of combustion of gasoline is about 45 kj/g. the amount of energy needed to heat 1 g of water from 20 °c to 100 °c is 80 °c x 4.18/g•°c. the enthalpy of vaporization of water is 2540 j/g. what mass of water at 20 °c can 1 g of gasoline heat and boil?
Answers
The mass of water that can be boiled by 1 g of gasoline by raising its temperature from 20 °c to 100 °c is 17.6 g.
Now, we know that energy can not be created nor destroyed but it can be converted from one form to another.
The heat produced by the gasoline is equal to the heat gained by water. Mathematically;
1g × 45 × 10^3 = [1 g × 4.18 × (100 - 20) + 2540m]
45 × 10^3 = 334.4 + 2540m
45 × 10^3 - 334.4 = 2540m
m = 45 × 10^3 - 334.4 /2540
m = 17.6 g
The mass of water that can be boiled by 1 g of gasoline by raising its temperature from 20 °c to 100 °c is 17.6 g.
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pls help asap....................
Answers
According to the following map, what is a type of mineral found in Mexico?
a | Bauxite
b | Copper
c | Gold
d | Zinc
Answers
Answer:
B) copper
Explanation:
According to the map, iron, silver, and copper are found in Mexico. That makes B) copper your answer, as it is the only one that shows up for both the answer choices as well as the map.
How many moles are present in 5.67x10^25 atoms of Carbon (C)?
Answers
Answer:
94.155 Moles
Explanation:
Since you are given atoms, to get to moles you need to use the formula I used below. Pretty simple, just plug and chug. Work can be found below.
Hope this helps! :^)
94. 125 moles are present in 5.67x10^25 atoms of Carbon (C).
What is mole?
The mole is a unit of measurement that is comparable to well-known units like pair, dozen, bulk, etc. It offers a precise count of atoms or molecules in a large sample of materials.
The amount of substance that has the same number of discrete entities (atoms, molecules, ions, etc.) as the number of atoms in a sample of pure 12C weighing exactly 12 g is known as a mole.
The word "mole" has a "big mass" or "bulk" sense in Latin, which is congruent with its use as the name for this unit. The mole establishes a connection between bulk mass, which is a simple macroscopic attribute to measure, and the number of atoms, molecules, and other fundamental units, which is a crucial fundamental property.
Therefore, 94. 125 moles are present in 5.67x10^25 atoms of Carbon
(C).
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a) Identify which one of the particles is
I) an anion.
2) a cation
Answers
Answer: Particle F is an anion, and particle E is a cation
Explanation:
A particle is a cation if it has more protons than electrons.
A particle is an anion if it has more electrons than protons.
Hope it helps :) and let me know if you want me to elaborate.
Transition metals have roman numerals after the metal name
t or f ??
Answers
Answer: false
Although they bel,ong to the transition metal category, these metals do not have Roman numerals written after their names because these metals only exist in one ion.
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Q: Arrange the element according to the increase radius or size
1. Na, K, Cs Fr, Rb
2. Ca, Sr, Ba, Ra, Mg
Answers
Answer:
Refer to the periodic table to do this.
Explanation:
1. Na, K, Cs Fr, Rb
Sodium, Potassium, Cesium, Francium, Rubidium
3, 4, 6, 7, 5
Ascending order: Na, K, Rb, Cs, Fr
2. Ca, Sr, Ba, Ra, Mg
Calcium, Strontium, Barium, Radium, Magnesium
4, 5, 6, 7, 3
Ascending Order: Mg, Ca, Sr, Ba, Ra
When doing the electronic configuration of the elements, count how many number of divides it has. For example, Na(Sodium) has 11 electrons and it is divided like this: 2,8,1. So it divides into 3 parts so there will 3 shells for sodium.
Hopefully this helps!!
Imagine yourself making a nice cup of tea on a cold winter day. You begin by boiling some water in a kettle. Next, you add the steaming liquid to your cup. Then, you open a tea bag and repeatedly dunk it into the water. You pour a dash of milk and drop a few sugar cubes into the cup, stirring the solution with a spoon. Finally, you squeeze a bit of lemon into your tea mixture. However, before you have time to stir the lemon juice into your tea, the liquid forms clumps. In other words, your tea has curdled!
Based on the scenario, answer the questions below.
Which of the four indicators of a chemical change is described in the paragraph above?
What makes the tea with milk and lemon curdle?
Name some of the chemical substances in the tea mixture. (You will need to conduct some research on your own to do this.)
Which chemicals could have reacted to cause the curdling?
Answers
What is a single layer of graphite called
Asking for GCSE Chemistry
Answers
Answer:
GRAPHENE is a single layer of graphite
Explanation:
each carbon atom bonded to 3 other carbon atoms forming a hexagonal lattice
Which procedure would produce the best data for comparing the electrostatic forces between the molecules of different substances?
Heat each substance in liquid form for the same amount of time. Measure the temperature of each substance.
Heat each substance in liquid form to its boiling point. Measure the temperature of each substance.
Heat each substance in solid form to its melting point. Measure the quantity of each substance that has melted.
Heat each substance in solid form for the same amount of time. Measure the temperature of each substance.
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The best data for comparing the electrostatic forces between the molecules of different substances can be obtained through this procedure: B. Heat each substance in liquid form to its boiling point. Measure the temperature of each substance.
An electrostatic force can be defined as a force of attraction or repulsion between two (2) stationary and electrically charged particles of a substance.
Basically, the force between two (2) charges is inversely proportional to the square of the distance between them and directly proportional to the magnitude of their charges.
In the molecule of a substance, an electrostatic force is mainly responsible for holding its atoms together while giving the molecule both structure and strength.
During an experiment that is aimed at obtaining the best data to compare the electrostatic forces between the molecules of different substances, the procedure that should be adopted include:
Each of the substance should be heated in liquid form to its boiling point.The boiling temperature of each substance should be measured and recorded.From the data, a comparison should be done to know which molecule contain atoms that are tightly held together.Read more: https://brainly.com/question/24031197
Answer:
B. Heat each substance in liquid form to its boiling point. Measure the temperature of each substance.
Explanation:
Just in case you couldn't find the answer. <3
How could you break down the compound calcium carbonate into the elements that make it up ?
A. by melting
B. by crushing
C. with filter
D. with chemical changes
Answers
Answer:
A. By melting
Explanation:
You can break it down by thermal decomposition which is basically melting it and thats because many metal carbonates can take part in thermal decomposition reactions.
The minimum collision energy between two molecules in order for them to react is called A activation energy. B dispersal energy C spontaneous energy D transition energy.
Answers
A: activation energy
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Part B
Emmerson pours the clear water into the side of the vase with the soil and gravel. The series of animated pictures shows how his model looked over time. What do you observe?
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Answer:
experiment can show the movement of pollutants through the groundwater!
Explanation:
Answer:
I see that the water is starting to get darker and darker which means it is getting dirtier the higher is goes up. So that means that the soil and gravel will pollute the water with dirt, gravel, etc.
Explanation: Please give brainliest have a good day:)
82. How many moles of calcium are in 3.82g of calcium?
Answers
Moles= 3.82/40
Moles= 0.0955 mol
For a reversible system, the entropy change of the system is equal to entropy transferred with _____.
Answers
Answer:
Heat
Explanation:
Some single-celled organisms make copies of themselves through mitosis. Which describes the function of the cell cycle in such single-celled organisms?
Answers
Answer:
mitosis?
Explanation:
Some single celled organisms make copies of themselves through mitosis
In unicellular organisms such as bacteria, mitosis is a type of asexual reproduction, making identical copies of a single cell. In multicellular organisms, mitosis produces more cells for growth and repair.
6. (04.02 MC) Two chemical reactions are shown:
A. Ca(OH)2 → CaO + H2O
B. 4K + O2 → 2K2O
Which statement is true? (4 points)
A) Both are synthesis reactions.
B) Both are decomposition reactions. C) A is a synthesis reaction, and B is a decomposition reaction.
D) A is a decomposition reaction, and B is a synthesis reaction.
Answers
A. Ca(OH)₂ → CaO + H₂O is a decomposition reaction
B. 4K + O₂ → 2K₂O is a synthesis reaction.
The correct answer to the question is Option (D) A is a decomposition reaction, and B is a synthesis reaction.
A decomposition reaction is a reaction in which a large compound is broken into two or more products for example:XY —> X + YA synthesis reaction is a reaction in which two or more substances combine to produce a single product. For exampleC + D —> CDWith the above information in mind, we conclude that:
A. Ca(OH)₂ → CaO + H₂O is a decomposition reaction
B. 4K + O₂ → 2K₂O is a synthesis reaction.
The correct answer to the question is Option (D) A is a decomposition reaction, and B is a synthesis reaction.
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Answer:
d
Explanation: