Which of these is a pure compound, which is an element, and which is neither?
helium gas | ---Select--- pure compound element neither |
carbon dioxide | ---Select--- pure compound element neither |
polluted water | ---Select--- pure compound element neither |
C6H12O6 | ---Select--- pure compound element neither |
gold | ---Select--- pure compound element neither |
steam |
Which of these is a pure compound, which is an element, and which is neither? helium...
The state of matter for an object that has neither definite shape nor definite volume is True or false? Juice freezing into a popsicle is an example of a physical change. freezing a liquid,boiling a liquidcondensing a gas Which of the following is a chemical change? Brass,Ammonia,Air,Carbon,Water,Gold are compounds? element is oxygen? Helium is an example of a homogeneous mixture or a compound? homogeneous mixture can it be vodka ? pure substance is water ?
I. Carbon atoms are about 25% lighter than oxygen atoms (the ratio of their weights is 3 to 4). What is the weight ratio of the carbon and oxygen that go into the formation of carbon monoxide, CO? (a) 4 parts carbon to 3 parts oxygen (b) 1 part carbon to 4 parts oxygen (c) 1 part carbon to 1 part oxygen (d) 4 parts carbon to 1 part oxygen (e) 3 parts carbon to 4 parts oxygen 2. How...
Which material(s) is an element? i. lead ii. carbon dioxide iii. apple juice (filtered) iv. helium v. sand in water vi. sodium bicarbonate (baking soda) a. i and iv b. ii and vi c. iii d. v
Classify each image as showing a pure element, a pure compound, a mixture of two elements, or a mixture of an element and a compound Pure element Pure compound Mixture of two elements Mixture of an element and a compound Answer Bank
Which material(s) is a compound? i. lead ii. carbon dioxide iii. apple juice (filtered) iv. helium v. sand in water vi. sodium bicarbonate (baking soda) a. i and iv b. ii and vi c. iii d. v
Green plants use light from the Sun to drive photosynthesis, a chemical reaction in which liquid water and carbon dioxide gas form aqueous glucose (C6H12O6) and oxygen (O2) gas. Calculate the moles of carbon dioxide needed to produce 0.055mol of glucose. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.
Green plants use light from the Sun to drive photosynthesis, a chemical reaction in which liquid water and carbon dioxide gas form aqueous glucose (C6H12O6) and oxygen (O2) gas. Calculate the moles of carbon dioxide needed to produce 0.060 mol of glucose. Be sure your answer has a unit symbol, if necessary, and round it to the correct number of significant digits.
Which of the following is not an element? O carbon gold O water O silver O tin
Which of the substances list below is a pure element. Check all that apply: Oxygen Carbon Monoxide CaCO3 S8 Air
1. An element belongs to Group 9. What common name might be used to describe the group to which the element belongs? a) alkaline earth b) semimetal c) nonmetal d) transition metal e) noble gas 2. Which of the following elements is most likely to react with oxygen? a) aluminium b) argon c) magnesium d) nitrogen e) silicon 3. Which element X is most likely to react to form the compound XF5? a) carbon b) antimony c) chlorine d) calcium...