Answers
___________________
Answer:
GoldExplanation:
A single atom of silver has a total of 47 protons and electrons and 61 neutrons. ... Therefore, gold has a density of 19.32 g/cm3 whereas silver has a density of only 10.49 g/cm3. Thus, a 1 oz bar of gold will be almost half as large as a 1 oz bar of silverRelated Questions
Silus wants to monitor the temperature of a reaction every 0.5 seconds for 30 minutes. He plans to generate a graph of the temperature values over time and insert the graph into a text document. Which pair of tools would be best for Silus to use?
Answers
Answer:
an electronic temperature probe and a computer
A single paper clip weighs about one gram. So 10 paper clips would weigh?
Answers
1 x 10= 10 or 1:1 > 10:10
Round the number 3456.5 to two significant figures.
Answers
Explanation:
35- this is the answer in 2s.f
When rounding a number to two significant figures, we consider the first two most significant digits from the left. In this case, the number is 3456.5. 3456.5 rounded to two significant figures is 3500.
Rounding numbers is a common mathematical process used to simplify or approximate values to a desired level of precision. It involves adjusting a number to a specific decimal place or significant figure.
To round 3456.5 to two significant figures, we look at the first two digits: 34.
The next digit after the second significant digit is 5. Since 5 is greater than or equal to 5, we round up the last significant digit.
Therefore, rounding 3456.5 to two significant figures gives us:
3500
So, 3456.5 rounded to two significant figures is 3500.
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An atom with 17 protons, 18 neutrons, and 18 electrons will have a charge of
Answers
Answer:
It's atomic mass is 35
Explanation:
This is because there is 1 more electron than there is protons, and since protons are positively charged and electrons are negatively charged, the charge ends up being negative as well.
Which of these is a physical property?
A) ability to burn a piece pf paper
B) pure sodium reacts violently with water
C) the boiling point of water is 100°C
D) helium does not tend to react with anything
Answers
Answer:
the boiling point of water is 100°C
Explanation:
Write the net ionic equation for the acid-base reaction of hydrochloric acid with phosphine. (Include states-of-matter under the given conditions in your answer.)
Answers
The net ionic equation for the acid-base reaction of hydrochloric acid with phosphine is PH3(aq) + H⁺(aq) → PH⁺₄ (aq)
What is a Chemical reaction?A chemical reaction shows us how substances interact which brings about changes in the composition of the reactants. Two types of Chemical reactions includes:
the net ionic equation balanced chemical equation.The net ionic equation of a chemical equation tells us only elements and ions directly involved in the chemical reaction.
Now for the reaction of hydrochloric acid, HCl with phosphine, PH3,
First write the aqueous substances in their ionic components
PH3(aq) + HCl(aq)→ PH4Cl(aq)
PH3(aq) + H⁺(aq) +Cl⁻(aq) → PH⁺₄ (aq) + Cl⁻(aq)
Then we remove the ions that do not take part in the reaction, Cl⁻(aq)
So we are left with
PH₃(aq) + H⁺(aq) → PH⁺₄ (aq)
Therefore, the net ionic equation for the reaction of hydrochloric acid with phosphine is PH₃(aq) + H⁺(aq) → PH⁺₄ (aq)
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When an iron nail is ground into powder, its mass ____.
a. stays the same
b. decreases
c. increases
d. cannot be determined
When paper turns yellow-brown upon exposure to sunlight, what type of change is likely taking place?
a. a physical change
b. a chemical change
c. neither a physical change nor a chemical change
d. both a physical change and a chemical change
Answers
Explanation:
(a) The mass of an object remains the same always. It is independent of its location. In this case, an iron nail is ground into powder. It means that its mass will remain unchanged. Hence, (a) is the correct option.
(b) Whenever there is a change of color of an object, a chemical reaction occurs. It shows that a reaction happens there. In this problem, a paper turns yellow-brown upon exposure to sunlight. A chemical reaction takes place there. Hence, (b) is the correct option.
1) The mass of any substance remains the same irrespective of the state.
Thus, an iron nail ground into powder should have the same mass unless parts of it got lost during grinding.
2) A paper that turns yellow-brown upon exposure to sunlight is likely undergoing a chemical change. It could be that the light oxidizes the atoms of the paper.
Chemical changes occur when the atoms of a substance combine with another substance to form new products. New products are not formed in physical changes and the original product can be retrieved by physical means.
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At the equator, the sun shine heats the air and
causes it to rise. At the north and south pole
there is less direct sun to warm the air, so this
air ______ (blank)
1. rinses
2. stinks
3. rises
4. sinks
Answers
5. An object is a regular, rectangular, solid with dimensions of 2 cm by 3cm by 2cm. It has a mass of 24 g. find its density.
Answers
Answer:
Density, D = 2g/cm^3
Explanation:
Given the following data;
Length = 2cm
Width = 3cm
Height = 2cm
Mass = 24g
Density = ?
Volume of a rectangular solid (V) = Length × Weight × Height
Therefore, V = L× W × H
Substituting the values, we have;
[tex]V = 2 *3 * 2 = 12[/tex]
V = 12cm
Density can be defined as the ratio of mass to volume i.e mass all over volume.
Mathematically, [tex]Density = \frac{Mass}{Volume}[/tex]
[tex]D = \frac{M}{V}[/tex]
Substituting the values, we have;
[tex]D = \frac{24}{12}[/tex]
Density, D = 2g/cm^3
Hence, the density of the rectangular solid is 2g/cm^3.
A hypothesis is based on the analysis of data collected in a controlled
experiment.
True
False
Answers
Match the labels to the
diagram.
Cell
Vacuole
membrane
Nucleus
Endoplasmic
reticulum
Ribosomes
Lysosome
Golg!
Mitochondrion
body
Answers
Answer:
Explanation hope this help and i hope this is the right answer for the question
help please!! will reward brainliest
Answers
Answer:
C
Explanation:
just did it and got good luck
A
is a changeable factor in an experiment.
O THEORY
O LAW
O HYPOTHESIS
O CONTROL
O VARIABLE
Answers
Answer:
Variable is a changebale factor in an experiment.
Explanation:
Answer: O VARIABLE
Explanation:
You are stranded on survivor island in which there are already 375 other survivors. For every survivor there are two hands, for every hand there is an eye; for every eye, there is a footprint; and for every 4 footprints, there is a dinosaur; for every half dinosaur, there are40 ducks; for every 20 ducks, there are 32 pineapples; for every 12 pineapples, there is 1 palm tree; for every 30 palm trees, there is 1 wave; for every wave, there are 100 anchors; and for every anchor, there are 30 turtles. How many turtles are on the island? Use dimensional analysis to solve this calculation.
Answers
Answer:
its in the answer
Explanation:
Which statement describes a controlled experiment? A.) It has one group in which the controlled variable is tested, and another in which the manipulated variable is tested. B.) It has one group in which the responding variable is tested, and another in which the responding variable is not tested. C.) It has one group in which the manipulated variable is tested, and another in which the responding variable is tested. D.) It has one group in which the manipulated variable is tested, and another in which the manipulated variable is not tested.
Answers
Answer:C.) It has one group in which the manipulated variable is tested, and another in which the responding variable is tested
Explanation: hope this helps
The statement that describes a controlled experiment is that it has one group in which the manipulated variable is tested, and another in which the responding variable is tested (option C).
What is a controlled experiment?A controlled experiment is an experiment where one variable is tested at a time and all other variables are kept constant.
An experiment consists of a manipulated or independent variable, which is the variable changed, and a responding or dependent variable, which is the variable measured.
Therefore, statement that describes a controlled experiment is that it has one group in which the manipulated variable is tested, and another in which the responding variable is tested.
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The most appropriate way to measure a volume of soda
Answers
Answer:
measure in cups or fluid ounces
Explanation:
Answer:
Liters
Explanation:
Trust me
What is the main cause of global convection currents?
Answers
Answer:
The main cause of global convection currents is the uneven heating of the earth by the sun. Hope this helped! :)
The main cause of global convection current is differential heating, that is the temperature difference in different levels of atmosphere.
What is convection current?Convection current is the heat transfer by fluid movement in the earth crust between different temperature regions. The density of fluids differs due to the temperature gradients and thus heated fluids raises and cooled fluid sinks.
The heated fluid movement causes the movement of plates of earth. The molten rock deep inside the earth crust circulates by the convection current.
Hence, the main cause of global convection current is the differential heating of the atmosphere.
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Which of the following most likely explains why the chemical symbol for calcium is Ca?
A. The symbol C was already used for carbon.
B. The symbol was assigned by modern alchemists.
C. Calcium is made of more than one type of atom.
Answers
Answer:
it is a latin word, so B
Explanation:
HELP ASAP!! A pebble is dropped into a graduated cylinder and the volume rises from 25.0 mL to 31.0 mL. The mass of the pebble is 2.9g. What is the density of the pebble? (g/mL)
Answers
Answer:
The density of the pebble is 0.483g/mL (rounded), but it's 0.48333333333333 without rounding. Hope this helped! :)
Explanation:
Volume= 6.0mL Density=Mass/Volume
Mass= 2.9g
D=2.9g/6.0mL
D=0.48333333333333g/mL
or
D≈0.483g/mL
The total number of protons and neutrons in an atom is its ___________________.
Answers
Answer:
nuggets
Explanation:
tazte very good
Answer:
It's atomic number is 2 so it has 2 protons. It's nucleus also contains 2 neutronns so 2+2=4 the answer is 4 in total.
Explanation:
I think. hehe I hope this helps though.
Which object has the lowest density
beach ball
water
sand
Answers
What’s the independent variable, dependent variable, experimental variable and constant?Scenario #1: Traci thinks that instrumental music played in the office will increase the productivity
of workers at the office. She creates two groups of 50 workers each and assigns each group the
same task in this case, they are asked to staple a set of papers). Group A has instrumental music
playing while they work. Group B does not have any music playing for them. After an hour, Traci
counts how many stacks of papers each group has made. Group A made 2,113 stacks. Group B
made 1,587 stacks.
Answers
Answer:
independent variable- instrumental music
dependent variable- Number of stacks of papers made
experimental variable- Group A has instrumental music
playing
constant- same task,
Explanation:
Round the the number below to the following places:
1254.6027
Rounded to the nearest... Correctly Rounded Number (Answer)
1000 place
100 place
10 place
1 place
10th place
100th place
1000th place
Answers
Answer: 1265.6037
Explanation:
TIME REMAINING
01:29:12
Which technology has helped improve scientists' ability to gather scientific data about the movement of sea turtles?
O satellite tracking
O thermometers
O probeware
microscopes
Answers
the first one satellite tracking
Answer:
I believe the answer is A. Or the 1st dot.
Explanation:
The chemical symbol for silver oxide, an ionic compound used to make button batteries, is made of silver and
oxygen and has a chemical formula of Ag20.
Answer 2 and 1
Answers
Answer:
2 Silver Ions
1 Oxygen Ion
Explanation:
Edg2021
The chemical symbol for silver oxide is not Ag₂0. The correct chemical formula for silver oxide is Ag₂O.
Silver oxide (Ag₂O) is an ionic compound composed of silver ions (Ag⁺) and oxide ions (O₂⁻). It is commonly used in button batteries as a cathode material. In this compound, two silver ions combine with one oxide ion to form a stable structure.
The chemical formula Ag₂O indicates that there are two silver ions (Ag⁺) and one oxide ion (O₂⁻) in each formula unit of silver oxide. The subscript 2 after Ag indicates that there are two Ag⁺ ions present, while the absence of a subscript after O indicates that there is one O₂⁻ ion.
Hence, the chemical formulae are discussed above.
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The density of lead is 11.342 g/cm 3 . What would be the volume of a 200.0 g sample of this metal?
Answers
Answer:
The answer is
17.63 mLExplanation:
The volume of a substance when given the density and mass can be found by using the formula
[tex]volume = \frac{mass}{density} \\ [/tex]
From the question
mass of lead = 200 g
density = 11.342 g/cm³
It's volume is
[tex]volume = \frac{200}{11.342} \\ = 17.6335743...[/tex]
We have the final answer as
17.63 mLHope this helps you
I need help, pls someone help me!!
Answers
Which component of air is given off when silicon dioxide is passed through air during the industrial preparation of air
Answers
Answer:
Answer the following questions: What is the composition of air? Answer: Air is composed of nitrogen, oxygen, carbon dioxide, many other gases, water vapour and dust particles. Which gas in the atmosphere is essential for respiration?
Explanation:
Answer:
poop
Explanation:
cus poop
The cell organelles that contains chlorophyll
Answers
Answer:
In plants, photosynthesis takes place in chloroplasts, which contain the chlorophyll. Chloroplasts are surrounded by a double membrane and contain a third inner membrane, called the thylakoid membrane, that forms long folds within the organelle.SHOW YOUR WORK!!!!!!!!!!!!!!!
An experiment performed to determine the density of lead yields a value of 10.95 g/cm3. The accepted value for the density of lead is 11.342 g/cm3. Find the percent error.
Answers
Answer:
3.45618%
Explanation:
Percent Error = measured value - accepted value/ accepted value x 100
Measured Value: 10.95
Accepted Value: 11.342
Work:
[tex]\frac{10.95-11.342}{11.342} *100[/tex]
[tex]\frac{-0.392}{11.342} *100[/tex] = -3.45618
You cannot have a negative percentage. Therefore the answer is 3.45618%