when salt is dissolved in water the result is a
Answer:
Water molecules pull the sodium and chloride ions apart
Explanation:
The number of neutrons in an atom affects the atomic ________of the atom. A. Activity B. number C. size D. mass
Answer:
D. Mass
Explanation:
Answer:
D
Explanation:
The number of neutrons in an atom affects the atomic mass number or atomic weight.
The specific heat capacity of aluminum is 0.22 cal/g°C. How much energy needs to flow into 20.0 grams of aluminum to change its temperature by 15°C?
a) 0.017 cal
b) 0.29 cal
c) 66 cal
d) 1363 cal
*I NEED EXPLANATION, PLEASE*
Answer:
C) 66 calories
Explanation:
The Heat energy required to flow into a unit mass object to raise its temperature by 1 degree is known as specific heat capacity.
specific heat capacity of aluminum, c = 0.22 cal/g°C
mass of aluminium, m = 20.0 g
Use the periodic table to select the element that best fits each of the following descriptions.
Alkali metal:
aluminum
calcium
lithium
Answer:
Lithium
Explanation:
Using the periodic table, the selection of the element that best fits the following descriptions is lithium. The correct option is D.
What is a periodic table?A periodic table is a table that contains chemical elements in it. It is a tabular structure that displays elements according to their characteristics. It is used in chemistry and physics.
Lithium is an element that is present in the first row of the periodic table. The first row is called the alkali metals. Its atomic number is 3, and it is white and silvery.
Alkali metals are called alkali because they form alkalies reacting with water. Like lithium hydroxide. They are very strong bases. They are very reactive.
Thus, the correct option is D. lithium.
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Question 3 (1 point)
What are the best units for a scientist to measure the distance between cities?
A. miles
B.inches
C.meters
D.kilometers
Answer: A and D
Explanation: Miles and Kilometers are the best units when measuring distances between cities, this is because both units will in most cases give a reasonable representation of the distance being measured by giving an output which isn't too large or extremely small. Feets and inches are usually adopted when measuring length of objects which in most cases are small and average only a few meters. Meters are also used for measuring short and medium distances. However, representing distances between two cities in terms of inches or feets will usually give extremely large values. Hence, the need for a fairly larger unit in miles or kilometers.
you have an object with mass of 86 g and volume of 10 cm^3 (cubed). calculate density, show your work, and identify which material you have from the list.
Answer:
8.6g/cm³ (BRASS)
Explanation:
Given the following :
Mass of object = 86g
Volume of object = 10cm³
The density of an object is calculated using the formula :
Density(g/cm³) = mass(g) / volume(cm³)
Inputting our values :
Density = 86g / 10cm³
Density = 8.6g/cm³
According to the table provided, the object which corresponds to having a density of 8.6g/cm³ is BRASS
1. The density of the material is 8.6 g/cm³.
2. The material is brass
Density is simply defined as the mass per unit volume of a substance i.e
Density = mass / volume 1. Determination of the density of the materialThe density of the material can be obtained as shown below
Mass = 86 g
Volume = 10 cm³
Density =?Density = mass / volume
Density = 86 / 10
Density = 8.6 g/cm³Therefore, the density of the material is 8.6 g/cm³
2. Determination of the material.From the calculation made above, the density of the material is 8.6 g/cm³.
Comparing the density of the material (i.e 8.6 g/cm³) with those
given in the table from the question, we can conclude that the
material is brass.
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Organisms can be grouped according to how similar they are to one
another.Which list correctly shows the categories for sorting organisms
from the largest group to the smallest group? *
Answer:
Kingdom, phylum, class, order, family, genus, and species
Explanation:
Kingdom, phylum, class, order, family, genus, and species are the list used to classify organisms on the basis of similarities and differences. The largest group of classification is kingdom while the smallest group is the species. In each category, the organisms which are present are similar to each other while different from one another in some characteristics.
HELP give 5 examples of how greenhouse gases effect's our earth ANd wHo wAnNa be FrIeNds.
Answer:
- sunlight heats the earth's surface
- climate change by trapping heat in the ozone layer
- increased wild fires
- food shortages due to higher temperatures
- they contribute to respitory disease due to smog and air pollution
(lol i'll be your friend)
When you walk up to any substance, you can categorize the substance as a solid, liquid, or gas. You could further categorize the substance as being a pure substance or a mixture, which you wouldn't know without more information. Assuming the substance is pure, what are 3 ways you could report the "amount" of substance in front of you
Answer and Explanation:
In Chemistry, the quantity or amount of a pure substance is given by:
mass (in grams)Volume (in millilitres or litres)Moles (mol)Inter-conversion of units is allowed based on defined units and constituent of the substance.
I believe this explanation would be helpful and easy to follow.
Which is a good example of a contact force? A. protons in the nucleus of an atom B. a ball falling down after it's thrown up into the air C. a satellite orbiting Earth D. a bat hitting a ball
Answer:
B
Explanation:
Because a ball falling down is a good strong force
Correct Answer:
A ball hitting a bat
12. What is the mass, if the density is 2 and the volume is 6? *
3
O 12
O 15
How much heat is absorbed by 20g granite boulder as energy from the sun causes its temperature to change from 10°C to 29°C? The specific heat capacity of granite is 0.79 J/gºC.
Given :
Mass of granite , m = 20 g .
Change in temperature , [tex]\Delta T=29-10=19^oC[/tex].
Specific heat capacity of granite , [tex]C=0.79\ J/g^oC[/tex] .
To Find :
The heat absorbed by granite .
Solution :
We know , heat absorb is given by :
[tex]\Delta H=mC\Delta T\\\\\Delta H=20\times 0.79 \times 19 \ J\\\\\Delta H=300.2\ J[/tex]
Therefore , heat absorb is 300.2 J .
Hence , this is the required solution .
Taking into account the definition of calorimetry, the heat absorbed is 300.2 J.
In first place, calorimetry is the measurement and calculation of the amounts of heat exchanged by a body or a system.
Sensible heat is the amount of heat exchanged by a body without affecting its molecular structure. If you don't change the molecular structure, you don't change the state of aggregation. Since the molecular structure does not change, a change in temperature is observed.
In other words, sensible heat is the amount of heat that a body absorbs or releases without any changes in its physical state (phase change).
So, the equation that allows to calculate heat exchanges is:
Q = c× m× ΔT
where Q is the heat exchanged by a body of mass m, made up of a specific heat substance c and where ΔT is the temperature variation.
In this case:
Q= ? c= 0.79[tex]\frac{J}{gC}[/tex] m= 20 g ΔT= Tfinal - Tinitial= 29 C - 10 C= 19 CReplacing in the expression to calculate heat exchanges:
Q= 0.79[tex]\frac{J}{gC}[/tex]× 20 g× 19 C
Solving:
Q= 300.2 J
In summary, the heat absorbed is 300.2 J.
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brainly.com/question/11586486?referrer=searchResults brainly.com/question/24724338?referrer=searchResultsIn an atom, what is the number of profons equal
to?
Answer:
The atomic number
______is used in production of hard disk. 1 platinum 2 silver 3 gold
Answer:
platinum
Explanation:
the film on a hard drive platter contains platinum
How many grams are in 0.02 moles of beryllium iodide, Bel2?
Answer:
5.26g
Explanation:
Please see attached picture for full solution.
A model of an atom shows eight electrons in rings that represent different energy levels. How many electrons are in each energy level? A.four in the first energy level, four in the second energy level. B.zero in the first energy level, eight in the second energy level C.two in the first energy level, six in the second energy level D.eight in the first energy level, zero in the second energy level
Answer:
The correct option is;
C. Two in the first energy level, six in the second energy level
Explanation:
The electrons in an atom are arrange in orbital shells which are situated at different levels within the structure of the, depending on the energy of the electron. Electrons with the least amount of energy are found in the shell closest to the nucleus of the atom which is the first energy level
The maximum number of electrons that can be found in a given an energy level is obtained with the following formula;
The number of electron = 2 × n²
Where;
n = The number of the different energy level
Therefore;
The maximum number of electrons in the first energy where n = 1 is given as follows;
The number of electron = 2 × 1² = 2 electrons
The maximum number of electrons in the second energy level where n = 2 is given as follows;
The number of electron = 2 × 2² = 8 electrons
Given that there are only 8 electrons in the atom, we therefore have, 2 electrons in the first energy level and the remaining 8 - 2 = 6 electrons in the second energy level.
The carbon _____________________combines chemically with oxygen and hydrogen to form a _________________________known as sugar. When making syrup, the sugar is dissolved in water to make a_________________________ . Before the sugar and water are mixed, the _______________________________mixture is not the same sweetness throughout. After mixing, the solution____________________________ is because when sugar is evenly disbursed throughout the water. Finally, the water is slowly boiled off and the solution slowly becomes sticky and gooey because the______________________ has increased and the solution now resists flowing.
Compound, Element ,Heterogeneous ,Homogeneous, Mixture ,Viscosity
The carbon element combines chemically with oxygen and hydrogen to form a compound known as sugar. When making syrup, the sugar is dissolved in water to make a mixture . Before the sugar and water are mixed, the heterogenous mixture is not the same sweetness throughout. After mixing, the solution homogenous is because when sugar is evenly disbursed throughout the water. Finally, the water is slowly boiled off and the solution slowly becomes sticky and gooey because the viscosity has increased and the solution now resists flowing.
What do you mean the solution ?A solution is a homogeneous mixture of two or more substances. A solution may exist in any phase. A solution consists of a solute and a solvent.
For the solutions, with components in the same phase, the substances present in lower concentration are solutes, while the substance present in higher concentration is the solvent.
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A centimeter and milimeter differ from each other by a factor of _____?
Answer:
10
Explanation:
a centimeter and a milimeter differ from each other by a factor of 10
Answer: 10
Explanation:
Find 3.2458+1.221+4.45
Answer:
8.9168 is the answer..
If a cubic container has a side length of 50.0cm ,what is the volume in the liter?
Answer:
0.05 Liter
Explanation:
Conversion factor: 1/1000
1) Liter = Cubic Centimeter / 1000
2) Liter = 50 / 1000
3) Liter = 0.05
NEED HELP with 7. 8. 9. 10. 11. 12. And 14 !!
Answer:
1. 0.00040 calories
2. 8.57 calories
3. 0.196 calories
4. 68 calories
5. 243 calories
6. 83680 joules
7. 1,054,368 joules
8. 2.45 calories
9. 556 (it says calories to calories so it wouldn't change)
10. 28367.52 joules
11. 59.6 calories
12. 449.6 joules
13. 0.00234 calories
14. 23292.328 joules
15. 22877693.6 joules
Hope this helps!
Explanation:
is Weight Measurement a phenomenon?
Answer:
yes
Explanation:
it change everything
im pretty sure the awnser is yes
Write the correct term: In gaseous substances, the individual molecules are relatively (close/far apart) and are moving freely, rapidly, and randomly.
Answer:
far apart
Explanation:
The molecules of any gaseous compounds are loosely bound and the molecules are far apart from each other. They move freely and rapidly. The inter-molecular forces are lower as compared to a solid or a liquid where the molecules are comparatively closely bound in the compounds.
Because of the large gap or distance between its molecules, gaseous compounds have less density when compared to any solid or liquid.
What is the mass of a sample of iron that has had 300.0 j applied to it and heats up from 20.0 degrees Celsius to 40.0 degrees Celsius.. the specific heat of iron is 0.46j/gC
Answer:
The mass of a sample of iron that has had 300 J applied to it and heats up from 20 degrees Celsius to 40 degrees Celsius is 32.61 grams.
Explanation:
Calorimetry is the measurement and calculation of the measurement of heat changes exchanged by a body or a system produced in physical and chemical processes.
The sensible heat of a body is the amount of heat received or transferred by a body to produce a change in temperature but without a change in physical state.
The sensible heat in a constant pressure is calculated by:
Q = c * m * ΔT
where Q is the heat exchanged by a body of mass m, constituted by a substance of specific heat c, and where ΔT is the temperature variation (ΔT=Tfinal - Tinitial)
In this case:
Q= 300 Jc= 0.46 [tex]\frac{J}{g*C}[/tex]m= ?Tfinal= 40 CTinitial= 20 CReplacing:
300 J= 0.46 [tex]\frac{J}{g*C}[/tex] * m* (40 - 20) C
Solving:
300 J= 0.46 [tex]\frac{J}{g*C}[/tex] * m* 20 C
[tex]m=\frac{300 J}{0.46 \frac{J}{g*C} * 20 C}[/tex]
m= 32.61 g
3) What is the weight of the ethyl alcohol that exactly fills a
200.0 mL container? The density of ethyl alcohol is 0.789
g/mL.
Answer:
158g
Explanation:
To calculate the "weight" (mass) of ethyl alcohol, we have to use this formula:
- Density will have units of gmL when dealing with a liquid or units of gcm3 when dealing with a solid.
The mass has units of grams, g.
The volume will have units of mL or cm3
We are given the density and volume, both of which have good units so all we have to do is rearrange the equation to solve for the mass:
density×volume=massvolume×volume
Density×Volume = Mass
0.789gmL×200.0mL
Thus, ethyl alcohol weighs 158g.
A biological community together with its physical habitat constitutes a(n) ____________ .
Answer:
Ecosystem
Explanation:
I got the answer from the Mcgrawhill textbooks.
Can someone find the independent variable and the dependent variable ? :)))
Answer: Dependant variable = The distance it takes for each car to stop. Independent variable = Both cars go at 60 mph.
Explanation:
This is right because the dependant variable changes and the independent variable is the outcome of the dependant variable.
gold is heavier than aluminium if we put a 100 gram biscuit of gold in water taken in a measuring cylinder or we put a 100 gram aluminium bar in the measuring cylinder will the rise in the level of the water be same or different in the two cases give reason
Answer:
The level of the water will be higher for 100g Al because occupy more space than gold.
Explanation:
To understand this problem, we must know Archimedes' principle:
"A body that is submerged in a fluid produce a bouyant force equal to the weight of the fluid that the body displaces". The volume of the body is equal to the volume displaced in the liquid.
Now, as gold is heavier than aluminium, 100g of Al have more volume than 100g of gold, than means:
The level of the water will be higher for 100g Al because occupy more space than gold.Why is it important to collect all data during experiments, rather than make inferences of what will happen?
Answer:
It is important to collect all data first, or else your guesses could purely be the opposite of the right answer. If you make inferences of what might happen, your guesses may be purely fictional, and totally off-topic. During experiments, this step is important.
Compare the properties of iron and nickel.
I need 3 comparisons
Answer:
It is important to note that iron, cobalt, and nickel which appear in period 4, of the transition metals, next to each other, share very similar physical and chemical properties and are known collectively as the iron triad
The comparison of the properties of iron includes
Chemical properties
1) Atomic number; The atomic number of iron is 26 while the atomic number of nickel is 28
2) The oxidation states of iron are 2, 3, 6 while the oxidation state of nickel are 2,3
3) The ionization energies in kJ/mol are first 759, second 1561, and third 2957 for iron and first 737, second 1753, and third 3393 for nickel
Physical properties
1) The mass of iron is 55.85 with density = 7.87 g/cm³, the mass of nickel is 58.69 with density = 8.91 g/cm³
2) The melting point of iron is 1530°C, boiling point 2862°C and that of nickel are 1455°C and 2732°C
3) The electrical conductivity of iron is 16 and that of nickel is 23
Explanation: