Answer:
This question is hard :( I dont know im so sorry
Explanation:
Answer:
The elements are arranged in seven horizontal rows, called periods or series, and 18 vertical columns, called groups.
Each row represents one period; the period number of an element indicates how many of its energy levels house electrons. Sodium, for instance, sits in the third period, which means a sodium atom typically has electrons in the first three energy levels.
Explanation:
Answer:
Alloy
Explanation:
Alloy: An alloy is a substance prepared by adding one or more element to a base or parent metal to obtain desirable products. The added element are usually metals or carbon. An alloy can be considered as a uniform mixture.
Examples of Alloy:
⇒ Brass is an alloy that contains 60 - 80% of copper and 20- 40% of zinc.
⇒Bronze is an alloy that contains 90% of copper and 10% of tin.
⇒ Steel is an alloy that contains 99.8% of iron and 0.2% of carbon.
Uses of Alloys:
⇒ They are used for making coins and medals
⇒ They are used in the construction of aircraft, ships and cars.
⇒They are used for making electromagnet.
The answer is true. I get those mixed up to
Answer:
Explanation:
We are asked to find the pressure of a gas in a can given a change in temperature. We will use Gay-Lussac's Law, which states the pressure of a gas is directly proportional to the temperature. The formula for this law is:
Initially, the gas in the aerosol can has a pressure of 3.10 atmospheres at a temperature of 25 degrees Celsius.
The temperature is increased to 52 degrees Celsius, but the pressure is unknown.
We are solving for the new pressure, so we must isolate the variable 
. It is being divided by 52 degrees Celsius. The inverse operation of division is multiplication, so we multiply both sides of the equation by 52 °C.
The units of degrees Celsius cancel.
The original values of pressure and temperature have 2 and 3 significant figures. Our answer must be rounded to the least number of sig figs, which is 2. For the number we calculated, that is the tenths place. The 4 in the hundredth place tells us to leave the 4 in the tenths place.
The gas pressure in the can at 52 degrees Celsius is approximately <u>6.4 atmospheres.</u>
