Answer:
50 Electrons are found in Sn4+
Why are Li Na and k Placed in the same group of the periodic table?
Answer:
Their valence electrons/properties
Explanation:
Elements in the same group of the periodic table have the same amount of valence electrons, which determines how they bond with other elements in other groups. This also determines their properties such as their reactivity. Since Li, Na, and K are in the same group, they must have similar properties and the same amount of electrons in their outermost shell.
I need help like right now please
Answer:
The specific heat capacity of chromium is 0.449 j/g.°C thus given metal is chromium.
Explanation:
Given data:
Mass of metal = 24 g
Initial temperature = 20 °C
Final temperature = 45°C
Energy absorbed by metal = 269.4 j
Which metal is this = ?
Solution:
Specific heat capacity:
It is the amount of heat required to raise the temperature of one gram of substance by one degree.
Formula:
Q = m.c. ΔT
Q = amount of heat absorbed or released
m = mass of given substance
c = specific heat capacity of substance
ΔT = change in temperature
ΔT = 45°C - 20 °C
ΔT = 25°C
269.4 j = 24 g × c × 25°C
269.4 j = 600 g.°C× c
c = 269.4 j/600 g.°C
c =0.449 j/g.°C
The specific heat capacity of chromium is 0.449 j/g.°C thus given metal is chromium.
Sam wants to dissolve a drink mix quickly before she goes to school. She
adds 2 teaspoons of the drink mix to a glass that contains 8 ounces of
room-temperature water. What could Sam do that would best help to
speed up the dissolving?
Sam can stir the water after adding the drink mix to help increase or speed up the dissolving process in this scenario.
What is Dissolution?This is the process in which a solute dissolves in a solvent to form a solution under certain conditions.
Stirring will increase the surface area thereby leading to an increase in the dissolving process which makes it the most appropriate choice.
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54. Given the density of lead to be 11.4 g/cm' and a sample mass of 32 g what is the volume of this sample of
lead?
what kind of change is burning paper
Why are atoms more stable when combined?
A)The atoms have empty valence energy levels.
B)The atoms are less lonely.
C)The valence electrons feel less stable when combined.
D)The atoms have full valence energy levels.
Answer:
D
Explanation:
. One of the essential minerals in the human body is salt. How much salt (NaCl) is in the average adult human body?
Answer:
200g or 40 teaspoons
Explanation:
An average human, weighing about 50 pounds, has about 200 g or 40 tps of NACl
1. (Physical or Chemical) properties describe matter.
2. (Physical or Chemical) properties of a substance can be easily observed.
3. One can use their five senses to determine the (Physical or Chemical) properties of a substance.
4. (Physical or Chemical) properties usually describe how a substance reacts. 5. (Physical or Chemical) properties are not as easy to observe.
6. (Physical or Chemical) properties can be used to identify substances.
Explanation:
2. Chemical
3. Physical
5. Chemical
I think that's it
Hope it helps :)
Physical properties describe matter.Physical properties of a substance can be easily observed.One can use their five senses to determine physical properties.Chemical properties usually describe how a substance reacts. Physical properties can be used to identify substances.
What are physical properties?Any property which describes the state of a physical system is called as a physical property.Changes in physical properties are used to describe changes between the states. They are often related to as observable properties.
Physical property which can be quantified is a physical quantity. These are also classified further with respect to their directionality. Isotropic properties do not change with direction of observation while anisotropic properties change with direction of observation.
Physical properties are differentiated from chemical properties by the way they determine how a substance behaves in a chemical reaction.
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what is the formula of boron nitride?
The energy that travels and spreads through space
Answer:
Radiant energy
Explanation:
Answer: electromagnetic waves
Explanation: energy is transmitted through space in the form of electromagnetic waves Unlike sound electromagnetic waves can travel through empty space These waves include visible light x-rays and microwaves!
Indicate which element of the following pairs has the greater electronegativity
Answer:
sodium,silicon
Explanation:
sodium=11
siicon=14
I need help me I need helps
Answer:
a
Explanation:
Answer:
2 A
Explanation:
Why does a ballon filled with helium rise while a ballon filled with an equal volume of average atmospheric Air does not
3.. Which type of graph would be most helpful for comparing the calorie-content in a variety of
different cereal brands?
a. Line graph
b. Pie chart
C. Stem-and-leaf plot
d. Bar graph
Answer:
d. Bar graph
Explanation:
a. Line graph - this type of graph is best for continuous data, such as how a the sales of a particular cereal drop over time
b. Pie chart - this is best for % data, such as looking at the % of different nutrients (carbohydrates, fats, proteins) in a cereal
C. Stem-and-leaf plot - presents quantitative data such as the ages of people who buy a brand of cereal
d. Bar graph - this is best for plotting different numbers in distinct categories to compare them to one another
This is a question in Seneca, plz help asap bc I can't skip it!!
What do we call a pure sample that's run next to the tested substance to see if it's a component in the mixture?
Answer:
Chromatography?
Explanation:
When a pure sample is run next to a tested substance to check if it is a component in the mixture it is called a ; Reference value
A reference value in a test is the average of repeated value gotten from laboratory measurements carried out in the lab using an accurate measurement tool. It is the bench mark value for which the value of any tested substance will be compared to.
Therefore to verify if a tested substance is a component in the mixture we have to run it next to a pure sample ( reference value ).
Hence we can conclude that When a pure sample is run next to a tested substance to check if it is a component in the mixture it is called a ; Reference value
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4. Which of the following types of radiation is a form of ionizing radiation from
outer space? bong
A. cosmic radiation
C. gamma rays
B. visible light
D. X-radiation
The most common units for density are _______ and _______.
Answer:
g/cm3
Explanation:
(grams, centimeters)
What is the wavelength of light emitted between the 3 rd and 1 st energy levels? 121.5 nm 94.5 nm 102.5 nm 1875 nm
1. What can you conclude about the figure?
a. The arrow locations represent precision.
b. The arrow locations represent both high accuracy and
good precision.
c. The arrows have been thrown accurately toward the
bulls-eye.
d. The arrow locations represent neither accuracy
nor precision.
Answer : The correct option is, (d) The arrow locations represent neither accuracy nor precision.
Explanation :
Precision : It is defined as the closeness of two or more measurements to each other.
For Example: If we measure a length 4 times and we get 5.8 m each time. Then the measurement is very precise.
Accuracy : It is defined as the closeness of a measured value to a standard or known value.
For Example: If the weight of the substance is 40 kg and one person measures 39.9 kg and another person measures 39.8 kg. Then, the weight measured by first person is more accurate.
Hence, we from this we conclude that the arrow locations represent neither accuracy nor precision.
Answer : The correct option is, (d) The arrow locations represent neither accuracy nor precision.
Explanation :
Precision : It is defined as the closeness of two or more measurements to each other.
For Example: If we measure a length 4 times and we get 5.8 m each time. Then the measurement is very precise.
Accuracy : It is defined as the closeness of a measured value to a standard or known value.
For Example: If the weight of the substance is 40 kg and one person measures 39.9 kg and another person measures 39.8 kg. Then, the weight measured by first person is more accurate.
Hence, we from this we conclude that the arrow locations represent neither accuracy nor precision.
Which sub-atomic particle is NOT found at the center of the atom?
Answer:
Protons and neutrons are in the nucleus (the center of an atom), but electrons are not.
(b) Describe how Aluminium chloride can be separated from a mixture of aluminium chloride
and sodium chloride
Answer:
Since AlCl3 sublimes and NaCl does not sublime sublimation process will separate the two. Heat the mixture, aluminium chloride sublimes into vapour and forms the sublimate on the cooler parts of heating tube sodium chloride will remain at the bottom of the heating tube.
Explanation:
I hope it helps you ..
What is the theory of plate tectonics an what evidence supports it?
It’s science not chemistry
Answer:
Modern continents hold clues to their distant past. Evidence from fossils, glaciers, and complementary coastlines helps reveal how the plates once fit together. Fossils tell us when and where plants and animals once existed.
how do heater meals work?
Answer:
The patented TRUE-TECH Self-Heating Technology is a simple combination of food grade iron and magnesium powder, salt, and water. When the contents of the water pouch are poured over the heater pad, the Food Heater releases enough heat to warm-up a pre-cooked meal 100 degrees Fahrenheit in approximately 10 minutes.
Explanation:
Calculate the atomic mass of nitrogen if the two common isotopes of
nitrogen have masses of 14.003 amu (99.63% abundance) and 15.000 amu
(.37%)
Answer:
Atomic mass of nitrogen = 14.0067 amu.
Explanation:
Isotopes can be defined as two or more forms of a chemical element that are made up of equal numbers of protons and electrons but different numbers of neutrons.
Generally, the isotopes of a chemical element have the same chemical properties because of their atomic number but different physical properties due to their atomic weight (mass number).
The two isotopes of nitrogen are nitrogen-14 and nitrogen-15.
Given the following data;
Relative abundance of N-14 = 99.63%
Atomic mass of N-14 = 14.003
Relative abundance of N-15 = 0.37%
Atomic mass of N-15 = 15.000
The atomic mass is;
14.003 × (99.63/100) + 15.000 × (0.37/100)
Atomic mass = 14.003 × (0.9963) + 15.000 × (0.0037)
Atomic mass = 13.9512 + 0.0555
Atomic mass = 14.0067 amu.
Therefore, the atomic mass of nitrogen is 14.0067 amu.
Considering the definition of atomic mass, isotopes and atomic mass of an element, the average mass of nitrogen is 14.0067 amu.
First of all, the mass number A of an atom is the sum of the number of protons and the number of neutrons in the atomic nucleus.
Being the number of protons the atomic number, the same chemical element can be made up of different atoms, that is, their atomic numbers are the same, but the number of neutrons is different. These atoms are called isotopes of the element.
On the other hand, the atomic mass of an element is the weighted average mass of its natural isotopes.
In other words, the atomic masses of chemical elements are usually calculated as the weighted average of the masses of the different isotopes of each element, taking into account the relative abundance of each of them.
In this case, you know that the two common isotopes of nitrogen have masses of 14.003 amu (99.63% abundance) and 15.000 amu (0.37%). Then, the average mass of lithium can be calculated as:
14.003 amu×0.9963 + 15.000 amu×0.0037= 14.0067 amu
Finally, the average mass of nitrogen is 14.0067 amu.
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Which phase of the moon is shown?
O full moon
O first quarter
O waning gibbous
O waxing crescent
using the clues in the text you can determine environmental toxicologist studies how chemicals affect the environment
A- true
B- faulse
differences between mixtures and elements
Mixtures are a group of elements that are mixed together but not chemically combined
Elements are the fundamental materials of which all matter is composed.
Element: A substance that is made up of only one type of atom. Compound: A substance that is made up of more than one type of atom bonded together. Mixture: A combination of two or more elements or compounds which have not reacted to bond together
Which of the following is NOT a possible clue that a chemical change has
taken place? *
A change of color
O A change of state
Production of gas
Formation of a precipitate
Answer:
ok
Explanation:
Which of the following is NOT a possible clue that a chemical change has
taken place? *
A change of color
O A change of state
Production of gas
Formation of a precipitate
Calculate the pressure exerted on the floor when an elephant who weighs 2400 N
stands on one foot which has an area of 0.4 m².
Answer:
The answer is
6000 N/m² or 6000 PaExplanation:
The pressure exerted by an object given the force of the object and the area can be found by using the formula
[tex]P = \frac{f}{a} \\ [/tex]
where
P is the pressure
f is the force
a is the area
From the question
f = 2400 N
a = 0.4 m²
So we have
[tex]P = \frac{2400}{0.4} \\ [/tex]
We have the final answer as
6000 N/m² or 6000 PaHope this helps you
what particle is bigger Fr or Fe3+ why?
Answer:
Fe2+ is greater in size as it has lost less electrons than Fe3+ . So, the nuclear pull is more strong on Fe3+ decreasing the atomic size. Thus Fe2+ is greater in size.
Explanation:
