In the early 1880s, the British Scientist John Dalton worked to find the atomic mass of several common elements.How could knowing the atomic mass of an element help a chemist do his or her work?

A. The atomic mass could be used to convert that element into another element.

B. The atomic mass could be used to identify an element.

C. The atomic mass could be used to calculate the number of isotopes formed by the element.

When different parts of the oceans are heated unevenly, this causes the water to A. move in convection currents

What happens when different parts of the oceans are heated unevenly?

When different parts of the oceans are heated unevenly, it leads to temperature variations within the water. Warm water tends to rise, creating convection currents. This movement is driven by the principle that warm fluids are lighter and, therefore, buoyant, while cooler fluids are denser and tend to sink. This process is analogous to the movement of air in the atmosphere.

So, the uneven heating of ocean waters results in the generation of convection currents, as warm water ascends and cooler water descends. This phenomenon plays a crucial role in redistributing heat and influencing climate patterns across the globe.

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Answer:

a

Explanation:

Answer: The correct option is that the compounds are created by chemical reactions.

Explanation:  

Option 1: Elements combine chemically in a specific ratio to form compounds. They can't be separated by physical methods like filtration. For example, is made up 2 H-atoms and 1 O-atom. When we filter water through normal filtration, we do not obtain H-atom and O-atom separately, but we get combined form of hydrogen and oxygen atom that is .

Option 2: Compounds are formed when two or more elements combine chemically.

Option 3: Compounds can have more than two types of elements. For example, In , 3 elements are present - Calcium(Ca), Carbon(C), Oxygen(O).

Option 4: Compounds formed have different properties from one another. There can be difference in physical properties as well as chemical properties. For example, (water) and (calcium carbonate) are two compounds. Water is present in liquid state and calcium carbonate is present in solid state. Hence, it showed that all the compounds cannot have same properties.

Answer:

The following are the give branches of earth science

a) geology

b) oceanography

c) meteorology and climatology

d) environmental science

e) astronomy

Explanation:

a) geology: The study of earth as solid entity.

b) oceanography: study of oceans

c) meteorology and climatology: it deals with the study of atmosphere, the weather conditions, hurricanes etc, humidity, rainfall, etc.

d) environmental science: it deals with the study of environment, the impact of anthropogenic activities on environment.

e) astronomy: it is the study of outer space and the physical bodies beyond our planet, like study of moon etc.

Final answer:

Earth Science encompasses five main branches: Geology, Meteorology, Hydrology, Astronomy, and Environmental Science. Each one focuses on a specific aspect of the Earth's system and the understanding of how they interact and affect each other.

Explanation:

The Earth Science is a broad field that explores the interrelationships between physical and biological components of the Earth. It can be subdivided into five main branches:

1. Geology: the study of solid Earth and the processes that have shaped it over time.
2. Meteorology: the study of the Earth’s atmosphere, weather, and climate.
3. Hydrology: the study of water in all its forms (ice, water, vapor) on Earth's surface, underground and in the atmosphere.
4. Astronomy: the science of celestial bodies and the universe beyond Earth’s atmosphere.
5. Environmental Science: the study of the interactions between the physical, chemical, and biological components of the environment, including the impacts of humans on nature.

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Answer:

The answers are below

Explanation:

1.-  Change 9.0 x 10^7 from scientific to standard notation

Just move the decimal point 7 places to the right

                 90000000

2 Change 3.2 x 10^-5 from scientific to standard notation

Just move the decimal point 5 places to the left

              0.000032

3 Which types of measurements are appropriate for scientific notation? *

The speed of light                  is appropriate

The speed of a snail               isn't appropriate

The speed of your car            isn't appropriate

4 Write 0.0000000000372 grams in scientific notation. Then convert to SI base units.

Just move the decimal point 11 places to the right

                       3.72 x 10 ⁻¹¹ grams     =  3.72 x 10 ⁻¹⁴ kg

5 Write 45,000,000,000 kilometers in scientific notation. Then convert your answer to SI base units

Just move the decimal point 10 places to the left

             4.5 x 10 ¹⁰ km = 4.5 x 10¹³ m

6 A bulb thermometer gives an indoor temperature reading of 21 degrees Celsius. A digital thermometer in the same room gives a reading of 20.7 degrees Celsius. Which devise is more precise? Explain.

I think the digital thermometer is more precise because it can measure decimals, then the reading is closer to the right temperature. The other thermometer can't read decimals.

Final answer:

Among He, Ne, Ar, and Kr, krypton (Kr) would be most likely to form a compound with fluorine. It's one of the heavier noble gases, which can form compounds with highly reactive elements like fluorine due to their slightly less firm hold on outermost electrons.

Explanation:

The elements in Group 18 are noble gases: helium (He), neon (Ne), argon (Ar), krypton (Kr), xenon (Xe), and radon (Rn). These gases are known for their low reactivity because they have fully filled valence shells. However, the three heaviest noble gases - krypton, xenon, and radon - can react with fluorine to form fluorides, with xenon fluorides being the most well-researched among other noble gas compounds.

Among the options provided (He, Ne, Ar, Kr), krypton (Kr) would be the most likely to form a compound with fluorine. This is due to krypton's bigger size as it descends the periodic table, which slightly decreases the grip on its outermost electrons, making it marginally more likely to react with extremely reactive elements like fluorine.

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the specific heat capacity of the ore : 0.018 J/g°C  

Further explanation

In the calorimeter, the heat received is the same as the heat released  

Q abs = Q release

Heat can be calculated using the formula:  

Q = mc∆T  

Q = heat, J  

m = mass, g  

c = specific heat, joules / g ° C  

∆T = temperature difference, ° C / K  

Q released by a metallic ore and absorbed by water at calorimeter

Q ore = Q water

• Q water

m = 0.5 kg = 500 g

c = 4.18 J/g–°C.

Δt = 24.3 - 22 = 2.3

• the specific heat capacity of the ore.

Q ore = Q water = 4807 J

m ore = 3.5 kg = 3500 g

Δt = 100 - 24.3 = 75.7